*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

        /* ── Animated CSS variable registration ── */
        @property --primary       { syntax: '<color>'; inherits: true; initial-value: #A8C8E8; }
        @property --primary-light { syntax: '<color>'; inherits: true; initial-value: #C8DCF0; }
        @property --primary-glow  { syntax: '<color>'; inherits: true; initial-value: rgba(168,200,232,0.35); }
        @property --primary-dim   { syntax: '<color>'; inherits: true; initial-value: rgba(168,200,232,0.18); }
        @property --accent        { syntax: '<color>'; inherits: true; initial-value: #C4B5E8; }
        @property --accent-dim    { syntax: '<color>'; inherits: true; initial-value: rgba(196,181,232,0.18); }

        :root {
            --sb-w: 200px;
            /* ── Light warm-pastel theme ── */
            --bg:            #FAFAF7;
            --surface:       #F2EFF9;
            --card:          #FFFFFF;
            --card-hover:    #F7F5FE;
            --card-border:   rgba(168,200,232,0.28);
            --text:          #1A2B3C;
            --sub:           #4B5563;
            --muted:         rgba(168,200,232,0.14);
            --muted-border:  rgba(168,200,232,0.28);
            --primary:       #A8C8E8;
            --primary-light: #C8DCF0;
            --primary-glow:  rgba(168,200,232,0.40);
            --primary-dim:   rgba(168,200,232,0.18);
            --accent:        #C4B5E8;
            --accent-dim:    rgba(196,181,232,0.18);
            --danger:        #F4A8A8;
            --danger-glow:   rgba(244,168,168,0.40);
            --danger-dim:    rgba(244,168,168,0.18);
            --input-bg:      rgba(168,200,232,0.10);
            --green:         #A8E8C8;
            --green-dim:     rgba(168,232,200,0.18);
        }
        .dark {
            /* ── Dark theme ── */
            --bg:           #0F172A;   /* slate-900 — not pitch-black */
            --surface:      #1E293B;   /* slate-800 */
            --card:         #1E293B;   /* solid so text is readable */
            --card-hover:   #263548;
            --card-border:  rgba(255,255,255,0.10);
            --text:         #F1F5F9;   /* slate-100 */
            --sub:          #94A3B8;   /* slate-400 — solid, not semi-transparent */
            --muted:        rgba(255,255,255,0.08);
            --muted-border: rgba(255,255,255,0.14);
            --primary:      #38BDF8;
            --primary-glow: rgba(56,189,248,0.28);
            --primary-dim:  rgba(56,189,248,0.15);
            --accent:       #2DD4BF;
            --accent-dim:   rgba(45,212,191,0.14);
            --danger:       #f87171;
            --danger-glow:  rgba(248,113,113,0.28);
            --danger-dim:   rgba(248,113,113,0.14);
            --input-bg:     rgba(255,255,255,0.08);
        }

        html {
            scroll-behavior: smooth;
            /* iOS Safari: make 100vh equal the visible viewport, not the full page */
            height: -webkit-fill-available;
        }
        body {
            font-family: 'Noto Sans TC', sans-serif;
            background: var(--bg);
            color: var(--text);
            min-height: 100vh;
            min-height: -webkit-fill-available; /* iOS Safari address-bar fix */
            overflow-x: hidden;
            /* Explicit values so @property transitions fire correctly */
            --primary:       #A8C8E8;
            --primary-light: #C8DCF0;
            --primary-glow:  rgba(168,200,232,0.40);
            --primary-dim:   rgba(168,200,232,0.18);
            --accent:        #C4B5E8;
            --accent-dim:    rgba(196,181,232,0.18);
            transition:
                background     0.5s ease,
                color          0.5s ease,
                --primary      0.5s ease,
                --primary-light 0.5s ease,
                --primary-glow 0.5s ease,
                --primary-dim  0.5s ease,
                --accent       0.5s ease,
                --accent-dim   0.5s ease;
        }

        /* ── Ambient orbs ── */
        body::before, body::after {
            content: '';
            position: fixed;
            border-radius: 50%;
            filter: blur(120px);
            pointer-events: none;
            z-index: 0;
        }
        body::before {
            width: 700px; height: 700px;
            top: -250px; left: -200px;
            background: radial-gradient(circle, rgba(168,200,232,0.18) 0%, transparent 65%);
        }
        body::after {
            width: 500px; height: 500px;
            bottom: -150px; right: -150px;
            background: radial-gradient(circle, rgba(196,181,232,0.14) 0%, transparent 65%);
        }
        .dark body::before {
            background: radial-gradient(circle, rgba(168,200,232,0.10) 0%, transparent 65%);
        }
        .dark body::after {
            background: radial-gradient(circle, rgba(196,181,232,0.08) 0%, transparent 65%);
        }

        /* ── Sidebar ── */
        .sidebar {
            position: fixed;
            left: 0; top: 0; bottom: 0;
            width: var(--sb-w);
            background: linear-gradient(170deg, #EBF3FA 0%, #EDE9F7 55%, #EFF5F0 100%);
            backdrop-filter: blur(28px);
            -webkit-backdrop-filter: blur(28px);
            border-right: 1px solid rgba(168,200,232,0.25);
            z-index: 300;
            display: flex; flex-direction: column;
            transition: background 0.5s ease, border-color 0.5s ease;
            overflow: hidden;
        }
        .dark .sidebar { background: rgba(15,23,42,0.96); border-right-color: rgba(255,255,255,0.10); }

        .sb-logo {
            display: flex; align-items: center; gap: 10px;
            padding: 20px 16px 16px;
            border-bottom: 1px solid var(--card-border);
            text-decoration: none; color: var(--text);
            flex-shrink: 0;
        }
        .sb-logo-mark {
            width: 32px; height: 32px;
            background: linear-gradient(135deg, #A8C8E8, #C4B5E8);
            border-radius: 9px;
            display: flex; align-items: center; justify-content: center;
            font-size: 0.92rem; font-weight: 700;
            box-shadow: 0 4px 14px rgba(168,200,232,0.45);
            flex-shrink: 0;
        }
        .sb-logo-name {
            display: block;
            font-size: 0.94rem; font-weight: 700; letter-spacing: 0.02em;
            line-height: 1.2;
        }
        .sb-logo-sub {
            display: block;
            font-size: 0.62rem; color: var(--sub);
            letter-spacing: 0.03em; margin-top: 2px;
        }

        .sb-nav {
            flex: 1;
            display: flex; flex-direction: column;
            gap: 2px;
            padding: 12px 8px;
            overflow-y: auto;
        }

        .sb-item {
            position: relative;
            display: flex; align-items: center; gap: 10px;
            padding: 9px 12px;
            min-height: 40px;
            border-radius: 10px; border: none;
            background: transparent;
            color: var(--sub);
            cursor: pointer;
            font-family: inherit; font-size: 14px; font-weight: 500;
            text-align: left; width: 100%;
            transition: all 0.18s;
            white-space: nowrap;
        }
        .sb-item:hover:not(.disabled) { background: rgba(168,200,232,0.18); color: var(--text); }
        .sb-item.active {
            background: linear-gradient(135deg, rgba(168,200,232,0.30), rgba(196,181,232,0.22));
            color: #6B9EC4;
            font-weight: 600;
        }
        .dark .sb-item.active { background: var(--primary-dim); color: var(--primary); }
        .sb-item.disabled { cursor: default; opacity: 0.4; }

        .sb-icon {
            width: 20px; flex-shrink: 0;
            display: flex; align-items: center; justify-content: center;
        }
        .sb-icon svg { width: 15px; height: 15px; }
        .sb-icon .emoji { font-size: 0.93rem; line-height: 1; }
        .sb-label { flex: 1; }
        .sb-badge {
            font-size: 0.57rem; font-weight: 700;
            letter-spacing: 0.06em; text-transform: uppercase;
            padding: 2px 6px; border-radius: 4px;
            background: var(--muted); color: var(--sub);
            border: 1px solid var(--muted-border); flex-shrink: 0;
        }

        /* Tooltip for disabled items */
        .sb-item.disabled::after {
            content: attr(data-tooltip);
            position: absolute;
            left: calc(100% + 10px); top: 50%;
            transform: translateY(-50%);
            background: #3D5A73;
            border: 1px solid rgba(168,200,232,0.30);
            color: #fff;
            font-size: 0.72rem; font-weight: 500;
            padding: 5px 10px; border-radius: 7px;
            white-space: nowrap;
            opacity: 0; pointer-events: none;
            transition: opacity 0.18s; z-index: 400;
        }
        .dark .sb-item.disabled::after { background: #0d1b2e; }
        .sb-item.disabled:hover::after { opacity: 1; }

        .sb-divider { height: 1px; background: var(--card-border); margin: 6px 8px; }

        .sb-footer {
            padding: 8px 8px 16px;
            border-top: 1px solid var(--card-border);
        }

        /* ── LINE button ── */
        .line-btn {
            position: fixed;
            bottom: 28px; right: 24px;
            z-index: 400;
            display: flex; align-items: center; gap: 9px;
            padding: 12px 20px;
            background: #06C755;
            color: #fff;
            border: none; border-radius: 50px;
            font-family: inherit; font-size: 0.88rem; font-weight: 600;
            letter-spacing: 0.01em;
            cursor: pointer; text-decoration: none;
            box-shadow: 0 4px 20px rgba(6,199,85,0.4);
            transition: transform 0.18s, box-shadow 0.18s;
        }
        .line-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 28px rgba(6,199,85,0.5);
        }
        .line-btn:active { transform: translateY(0); }
        .line-btn svg { width: 20px; height: 20px; fill: #fff; flex-shrink: 0; }

        @media (max-width: 767px) {
            .line-btn {
                bottom: calc(72px + env(safe-area-inset-bottom));
                right: 14px; padding: 10px 16px; font-size: 0.82rem;
            }
        }


        /* ── Content wrap ── */
        .content-wrap {
            margin-left: var(--sb-w);
            min-height: 100vh;
            display: flex; flex-direction: column; align-items: center;
            transition: margin-left 0.3s;
            -webkit-overflow-scrolling: touch;
            overflow-scrolling: touch;
        }

        img {
            image-rendering: auto;
            transform: translateZ(0);
            -webkit-transform: translateZ(0);
        }

        /* ── Page layout ── */
        .page {
            position: relative; z-index: 1;
            width: 100%; max-width: 860px;
            padding: 44px 20px 60px;
            display: flex; flex-direction: column; align-items: center; gap: 16px;
        }

        /* ── Hero ── */
        .hero {
            text-align: center; margin-bottom: 8px;
        }
        .hero-badge {
            display: inline-flex; align-items: center; gap: 7px;
            padding: 4px 13px;
            background: linear-gradient(135deg, rgba(168,200,232,0.18), rgba(196,181,232,0.14));
            border: 1px solid rgba(168,200,232,0.38);
            border-radius: 20px;
            font-size: 0.7rem; font-weight: 600;
            color: var(--primary);
            letter-spacing: 0.07em; text-transform: uppercase;
            margin-bottom: 16px;
        }
        .live-dot {
            width: 5px; height: 5px;
            background: var(--primary); border-radius: 50%;
            animation: liveblink 2s ease-in-out infinite;
        }
        @keyframes liveblink { 0%,100%{opacity:1} 50%{opacity:0.25} }

        h1 {
            font-size: 2rem; font-weight: 700;
            letter-spacing: -0.025em; line-height: 1.2;
            background: linear-gradient(135deg, #2D3748 10%, #6B9EC4 60%, #9B87C8 100%);
            -webkit-background-clip: text; -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 9px;
        }
        .subtitle { color: var(--sub); font-size: 0.86rem; }

        /* ── Card base ── */
        .card {
            width: 100%;
            background: var(--card);
            border: 1px solid var(--card-border);
            border-radius: 18px;
            backdrop-filter: blur(28px);
            -webkit-backdrop-filter: blur(28px);
            box-shadow: 0 4px 20px rgba(168,200,232,0.18), 0 1px 4px rgba(0,0,0,0.04);
            transition: background 0.5s ease, border-color 0.5s ease;
        }
        .dark .card { box-shadow: 0 4px 32px rgba(0,0,0,0.35); }

        /* ── Controls card ── */
        .controls-card {
            padding: 22px 24px;
            background: linear-gradient(145deg, #FFFFFF 0%, #FDFBFF 100%);
        }
        .dark .controls-card { background: var(--card); }

        .controls-row {
            display: grid;
            grid-template-columns: 1fr auto;
            gap: 14px;
            align-items: end;
            margin-bottom: 22px;
        }

        .section-label {
            font-size: 0.67rem; font-weight: 600;
            letter-spacing: 0.1em; text-transform: uppercase;
            color: var(--sub); margin-bottom: 8px;
        }

        /* Level segment */
        .level-selector {
            display: flex; gap: 4px;
            background: var(--muted);
            border-radius: 10px;
            padding: 3px;
        }
        .level-btn {
            flex: 1; padding: 7px 4px;
            background: transparent; border: none;
            border-radius: 8px;
            color: var(--sub);
            cursor: pointer; font-size: 0.8rem;
            font-family: inherit; font-weight: 500;
            transition: all 0.18s;
        }
        .level-btn:hover { color: var(--text); }
        .level-btn.active {
            background: linear-gradient(135deg, #A8C8E8, #C4B5E8);
            color: #fff;
            font-weight: 600;
            box-shadow: 0 2px 10px rgba(168,200,232,0.40);
        }
        .dark .level-btn.active { background: var(--card-hover); color: var(--text); box-shadow: 0 1px 6px rgba(0,0,0,0.28); }
        .level-tag { font-size: 0.6rem; opacity: 0.5; margin-left: 2px; }

        /* Topic select */
        .topic-wrap { position: relative; }
        .topic-select {
            appearance: none; -webkit-appearance: none;
            width: 100%;
            background: var(--input-bg);
            border: 1px solid var(--card-border);
            border-radius: 10px;
            color: var(--text);
            font-family: inherit;
            font-size: 0.82rem; font-weight: 500;
            padding: 8px 32px 8px 12px;
            cursor: pointer;
            outline: none;
            transition: border-color 0.2s, background 0.2s;
        }
        .topic-select:hover { border-color: var(--muted-border); }
        .topic-select:focus { border-color: var(--primary); }
        .topic-select option { background: var(--surface); color: var(--text); }
        .topic-arrow {
            position: absolute; right: 10px; top: 50%; transform: translateY(-50%);
            pointer-events: none; color: var(--sub);
        }
        .topic-arrow svg { width: 13px; height: 13px; display: block; }

        /* ── Fixed recording bar (bottom of viewport) ── */
        .record-bar-fixed {
            position: fixed;
            bottom: 0;
            left: var(--sb-w);
            right: 0;
            z-index: 200;
            background: rgba(255,255,255,0.93);
            border-top: 1px solid rgba(80,112,140,0.13);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            box-shadow: 0 -6px 28px rgba(80,112,140,0.09);
            padding: 10px 20px calc(12px + env(safe-area-inset-bottom));
        }
        .dark .record-bar-fixed {
            background: rgba(18,24,32,0.95);
            border-top-color: rgba(80,112,140,0.22);
        }
        .record-bar-inner {
            max-width: 620px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 6px;
        }
        /* Mic area centered inside the bar */
        .record-bar-fixed .record-area {
            justify-content: center;
            margin-bottom: 0;
            width: 100%;
        }
        /* Small "AI 先開口" secondary pill button */
        .start-conv-btn-sm {
            padding: 6px 16px !important;
            font-size: 0.78rem !important;
            font-weight: 500 !important;
            border-radius: 20px !important;
            background: transparent !important;
            border: 1px solid rgba(168,200,232,0.55) !important;
            color: var(--primary) !important;
            box-shadow: none !important;
            gap: 6px !important;
        }
        .start-conv-btn-sm svg {
            width: 13px !important;
            height: 13px !important;
            fill: var(--primary) !important;
        }
        .start-conv-btn-sm:hover {
            background: rgba(168,200,232,0.12) !important;
            transform: none !important;
            box-shadow: none !important;
        }
        .start-conv-btn-sm:disabled {
            opacity: 0.45 !important;
        }
        /* Extra bottom padding so page content clears the fixed bar */
        #page-speak { padding-bottom: 200px; }

        @media (max-width: 767px) {
            .record-bar-fixed {
                left: 0;
                bottom: calc(64px + env(safe-area-inset-bottom));
            }
            #page-speak { padding-bottom: 220px; }
        }
        @media (min-width: 768px) and (max-width: 1024px) {
            .record-bar-fixed { left: 62px; }
        }

        /* Compact speak page title */
        .speak-title {
            display: flex; align-items: center; gap: 10px;
            font-family: 'Cormorant Garamond', 'Noto Serif TC', serif;
            font-size: 1.55rem; font-weight: 700;
            color: var(--primary);
            margin-bottom: 18px;
            padding: 4px 2px;
        }
        .speak-title-badge {
            display: inline-flex; align-items: center;
            padding: 3px 10px;
            background: linear-gradient(135deg, rgba(168,200,232,0.22), rgba(196,181,232,0.18));
            border: 1px solid rgba(168,200,232,0.40);
            border-radius: 20px;
            font-size: 0.68rem; font-weight: 700;
            letter-spacing: 0.12em; text-transform: uppercase;
            color: var(--primary);
        }

        /* Record area — hero placement */
        .record-area-hero {
            max-width: 860px;
            margin: 0 auto 24px;
            padding: 20px 24px;
            background: var(--card-bg);
            border: 1px dashed rgba(80,112,140,0.22);
            border-radius: 22px;
        }
        /* Record area */
        .record-area {
            display: flex; align-items: center; gap: 18px;
            margin-bottom: 18px;
        }
        .record-btn {
            flex-shrink: 0;
            width: 68px; height: 68px; border-radius: 50%;
            background: linear-gradient(135deg, #A8C8E8, #C4B5E8);
            border: none; cursor: pointer;
            display: flex; align-items: center; justify-content: center;
            box-shadow: 0 6px 24px rgba(168,200,232,0.50);
            transition: transform 0.18s, box-shadow 0.18s;
            will-change: transform;
            transform: translateZ(0);
            -webkit-transform: translateZ(0);
            backface-visibility: hidden;
            -webkit-backface-visibility: hidden;
        }
        .record-btn:hover { transform: scale(1.06); box-shadow: 0 8px 28px rgba(168,200,232,0.60); }
        .record-btn:active { transform: scale(0.96); }
        .record-btn.recording {
            background: linear-gradient(135deg, #F4A8A8, #F8C4A8);
            box-shadow: 0 6px 24px rgba(244,168,168,0.55);
            animation: rec-ring 1.8s ease-in-out infinite;
        }
        @keyframes rec-ring {
            0%   { box-shadow: 0 0 0 0   rgba(244,168,168,0.55), 0 6px 24px rgba(244,168,168,0.45); }
            65%  { box-shadow: 0 0 0 16px rgba(244,168,168,0),   0 6px 24px rgba(244,168,168,0.45); }
            100% { box-shadow: 0 0 0 0   rgba(244,168,168,0),   0 6px 24px rgba(244,168,168,0.45); }
        }
        .record-btn.processing {
            background: linear-gradient(135deg, #9CA3AF, #B0B8C4);
            box-shadow: 0 6px 24px rgba(156,163,175,0.45);
            animation: none; cursor: default;
        }
        .record-btn.error {
            background: linear-gradient(135deg, #F4A86A, #F8C47A);
            box-shadow: 0 6px 24px rgba(244,168,106,0.55);
            animation: none;
        }
        .record-btn svg { width: 26px; height: 26px; fill: white; }
        #icon-loading { animation: btn-spin 0.75s linear infinite; }
        @keyframes btn-spin { to { transform: rotate(360deg); } }

        .record-info { flex: 1; }
        .record-hint {
            font-size: 0.86rem; font-weight: 500; color: var(--text);
            margin-bottom: 4px; transition: color 0.2s;
        }
        .record-hint.rec { color: var(--danger); }
        .record-hint.processing { color: var(--sub); }
        .record-hint.error { color: #C07050; }
        .record-sub { font-size: 0.75rem; color: var(--sub); }

        .timer {
            font-size: 1.4rem; font-weight: 600;
            font-variant-numeric: tabular-nums;
            color: var(--danger);
            letter-spacing: 0.02em;
            display: none;
        }
        .timer.visible { display: block; }

        /* Status pill */
        .status-row {
            display: flex; align-items: center; gap: 8px;
            font-size: 0.76rem; font-weight: 500; color: var(--sub);
            min-height: 20px;
        }
        .spinner {
            width: 12px; height: 12px;
            border: 2px solid var(--muted);
            border-top-color: var(--primary);
            border-radius: 50%;
            animation: spin 0.65s linear infinite;
            display: none; flex-shrink: 0;
        }
        .status-row.loading .spinner { display: block; }
        @keyframes spin { to { transform: rotate(360deg); } }

        /* ── History feed ── */
        .history {
            width: 100%;
            display: flex; flex-direction: column; gap: 12px;
        }
        .history:empty { display: none; }

        .turn-card {
            width: 100%;
            background: var(--card);
            border: 1px solid var(--card-border);
            border-radius: 18px;
            overflow: hidden;
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            box-shadow: 0 2px 16px rgba(168,200,232,0.16), 0 1px 3px rgba(0,0,0,0.03);
            animation: fadeUp 0.35s ease both;
        }
        .dark .turn-card { box-shadow: 0 2px 24px rgba(0,0,0,0.40); }
        @keyframes fadeUp {
            from { opacity: 0; transform: translateY(22px) scale(0.97); }
            to   { opacity: 1; transform: translateY(0) scale(1); }
        }

        /* ── Page load stagger ── */
        .page > * {
            animation: pageEnter 0.55s cubic-bezier(0.22,1,0.36,1) both;
            will-change: transform;
        }
        .page > *.anim-done {
            will-change: auto;
        }
        .page > *:nth-child(1) { animation-delay: 0.04s; }
        .page > *:nth-child(2) { animation-delay: 0.11s; }
        .page > *:nth-child(3) { animation-delay: 0.18s; }
        .page > *:nth-child(4) { animation-delay: 0.25s; }
        .page > *:nth-child(n+5) { animation-delay: 0.32s; }
        @keyframes pageEnter {
            from { opacity: 0; transform: translateY(18px); }
            to   { opacity: 1; transform: translateY(0); }
        }

        /* ── Record button breathing (idle state only) ── */
        .record-btn:not(.recording):not(.processing):not(.error) {
            animation: breathe 3.2s ease-in-out infinite;
        }
        @keyframes breathe {
            0%, 100% { transform: scale(1);    box-shadow: 0 6px 24px rgba(168,200,232,0.50); }
            50%       { transform: scale(1.07); box-shadow: 0 10px 36px rgba(168,200,232,0.68); }
        }
        .record-btn:not(.recording):not(.processing):not(.error):hover  { animation: none; transform: scale(1.09); }
        .record-btn:not(.recording):not(.processing):not(.error):active { animation: none; transform: scale(0.96); }

        /* ── Character card entrance ── */
        @keyframes charEnter {
            0%   { opacity: 0; transform: scale(0.86) translateY(12px); }
            65%  { transform: scale(1.03) translateY(-3px); }
            100% { opacity: 1; transform: scale(1) translateY(0); }
        }
        .char-card.entering {
            animation: charEnter 0.45s cubic-bezier(0.34,1.4,0.64,1) both !important;
        }

        /* ── Stat card hover + enhanced stat value ── */
        .stat-card {
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }
        .stat-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(168,200,232,0.28);
        }

        /* ── Enhanced stat-pop ── */
        @keyframes stat-pop {
            0%   { transform: scale(1); }
            35%  { transform: scale(1.28); color: var(--primary); }
            65%  { transform: scale(0.95); }
            100% { transform: scale(1); }
        }

        /* ── Eval score big reveal ── */
        .eval-score-hero {
            font-size: 2.6rem; font-weight: 800;
            line-height: 1; letter-spacing: -0.04em;
            color: var(--primary);
            animation: scoreReveal 0.6s cubic-bezier(0.34,1.56,0.64,1) both;
        }
        @keyframes scoreReveal {
            from { transform: scale(0.3) translateY(8px); opacity: 0; }
            to   { transform: scale(1) translateY(0); opacity: 1; }
        }
        .eval-score-stars {
            font-size: 1rem; letter-spacing: 0.08em;
            animation: fadeUp 0.4s ease both;
            animation-delay: 0.15s;
        }
        .eval-header-score-wrap {
            display: flex; flex-direction: column; align-items: center; gap: 1px;
        }

        /* ── Subtle card hover lift ── */
        .card:not(.turn-card):not(.controls-card) {
            transition: background 0.5s ease, border-color 0.5s ease, transform 0.22s ease, box-shadow 0.22s ease;
        }
        .card:not(.turn-card):not(.controls-card):hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(168,200,232,0.24), 0 2px 6px rgba(0,0,0,0.04);
        }
        .dark .card:not(.turn-card):not(.controls-card):hover {
            box-shadow: 0 8px 32px rgba(0,0,0,0.45);
        }

        /* ── Page switch animation reset ── */
        .page-entering > * {
            animation: pageEnter 0.50s cubic-bezier(0.22,1,0.36,1) both !important;
        }
        .page-entering > *:nth-child(1) { animation-delay: 0.03s !important; }
        .page-entering > *:nth-child(2) { animation-delay: 0.09s !important; }
        .page-entering > *:nth-child(3) { animation-delay: 0.15s !important; }
        .page-entering > *:nth-child(4) { animation-delay: 0.21s !important; }
        .page-entering > *:nth-child(n+5) { animation-delay: 0.27s !important; }

        .turn-meta {
            display: flex; align-items: center; justify-content: space-between;
            padding: 10px 16px;
            border-bottom: 1px solid var(--card-border);
            font-size: 0.68rem; font-weight: 600;
            letter-spacing: 0.07em; text-transform: uppercase;
            color: var(--sub);
        }
        .turn-tags { display: flex; gap: 6px; }
        .turn-tag {
            padding: 2px 8px;
            border-radius: 6px;
            font-size: 0.62rem; font-weight: 600;
            letter-spacing: 0.05em;
        }
        .turn-tag.level { background: var(--primary-dim); color: var(--primary); }
        .turn-tag.topic { background: var(--accent-dim); color: var(--accent); }

        .turn-body { padding: 14px 16px; display: flex; flex-direction: column; gap: 12px; }

        .msg-block { display: flex; flex-direction: column; gap: 5px; }
        .msg-header {
            display: flex; align-items: center; justify-content: space-between;
        }
        .msg-label {
            display: flex; align-items: center; gap: 6px;
            font-size: 0.67rem; font-weight: 600;
            letter-spacing: 0.08em; text-transform: uppercase;
        }
        .msg-dot { width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0; }
        .user-msg .msg-label { color: var(--primary); }
        .user-msg .msg-dot   { background: var(--primary); }
        .ai-msg   .msg-label { color: var(--accent); }
        .ai-msg   .msg-dot   { background: var(--accent); }

        .copy-btn {
            display: flex; align-items: center; gap: 4px;
            background: var(--muted);
            border: 1px solid var(--muted-border);
            border-radius: 6px;
            color: var(--sub);
            cursor: pointer;
            font-size: 0.67rem; font-family: inherit; font-weight: 500;
            padding: 3px 8px;
            transition: all 0.18s;
        }
        .copy-btn:hover { color: var(--text); border-color: var(--card-border); }
        .copy-btn.copied { color: var(--accent); border-color: var(--accent-dim); background: var(--accent-dim); }
        .copy-btn svg { width: 11px; height: 11px; }

        .msg-text {
            font-size: 0.9rem; line-height: 1.7;
            color: var(--text);
            word-break: break-word;
        }
        .msg-text:empty { color: var(--sub); }
        .msg-text:empty::before { content: '─'; }

        /* Turn audio */
        .turn-audio {
            padding: 0 16px 14px;
        }
        .audio-player-wrap {
            display: flex; align-items: center; gap: 10px;
        }
        audio {
            flex: 1; min-width: 0;
            height: 34px; border-radius: 8px;
            accent-color: var(--primary);
        }
        audio::-webkit-media-controls-panel {
            background: var(--muted); border-radius: 8px;
        }
        /* Replay / 重聽 buttons */
        .replay-btn {
            flex-shrink: 0;
            display: inline-flex; align-items: center; gap: 4px;
            padding: 5px 12px;
            background: linear-gradient(135deg, rgba(168,200,232,0.20), rgba(196,181,232,0.15));
            border: 1.5px solid rgba(168,200,232,0.45);
            border-radius: 20px;
            color: #6B9EC4;
            cursor: pointer;
            font-family: inherit; font-size: 0.75rem; font-weight: 600;
            white-space: nowrap; min-height: 30px;
            transition: background 0.18s, color 0.18s, transform 0.15s, box-shadow 0.18s;
        }
        .replay-btn:hover  { background: linear-gradient(135deg, #A8C8E8, #C4B5E8); color: #fff; border-color: transparent; box-shadow: 0 3px 12px rgba(168,200,232,0.40); }
        .replay-btn:active { transform: scale(0.94); }
        .dark .replay-btn { background: var(--primary-dim); border-color: var(--primary); color: var(--primary); }
        /* User replay: sits beside the "你說" label like the copy button */
        .user-replay-btn {
            display: inline-flex; align-items: center; gap: 4px;
            background: var(--muted);
            border: 1px solid var(--muted-border);
            border-radius: 6px;
            color: var(--sub);
            cursor: pointer;
            font-size: 0.67rem; font-family: inherit; font-weight: 500;
            padding: 3px 8px; min-height: 28px;
            transition: all 0.18s;
        }
        .user-replay-btn:hover { color: var(--text); border-color: var(--card-border); }

        /* ── Feedback / learning card ── */
        .feedback-section {
            border-top: 1px solid rgba(196,181,232,0.22);
            background: linear-gradient(135deg, rgba(168,200,232,0.07), rgba(196,181,232,0.07));
            padding: 14px 16px 16px;
        }
        .dark .feedback-section { background: rgba(196,181,232,0.08); }
        .feedback-header {
            display: flex; align-items: center; gap: 7px;
            font-size: 0.67rem; font-weight: 700;
            letter-spacing: 0.09em; text-transform: uppercase;
            color: #5B4080;
            margin-bottom: 10px;
        }
        .feedback-header svg { width: 14px; height: 14px; fill: #5B4080; flex-shrink: 0; }
        .feedback-body {
            font-size: 0.84rem; line-height: 1.85;
            color: var(--text);
            white-space: pre-wrap;
            word-break: break-word;
        }

        /* ── Error tag pills ── */
        .error-tags-row {
            display: flex; flex-wrap: wrap; gap: 6px;
            margin-bottom: 12px;
        }
        .error-tag {
            display: inline-flex; align-items: center; gap: 4px;
            font-size: 0.72rem; font-weight: 600;
            padding: 3px 9px; border-radius: 20px;
            line-height: 1.4;
        }
        .error-tag .tag-dot { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; }
        .error-tag .tag-detail { font-weight: 400; opacity: 0.85; }
        /* red – 助詞錯誤 */
        .etag-red  { background: rgba(239,68,68,0.12); color: #dc2626; border: 1px solid rgba(239,68,68,0.3); }
        .dark .etag-red  { background: rgba(239,68,68,0.18); color: #f87171; border-color: rgba(239,68,68,0.35); }
        .etag-red  .tag-dot { background: #ef4444; }
        /* orange – 文法錯誤 */
        .etag-orange { background: rgba(249,115,22,0.1); color: #ea580c; border: 1px solid rgba(249,115,22,0.28); }
        .dark .etag-orange { background: rgba(249,115,22,0.18); color: #fb923c; border-color: rgba(249,115,22,0.35); }
        .etag-orange .tag-dot { background: #f97316; }
        /* yellow – 不自然表達 */
        .etag-yellow { background: rgba(234,179,8,0.1); color: #a16207; border: 1px solid rgba(234,179,8,0.28); }
        .dark .etag-yellow { background: rgba(234,179,8,0.15); color: #fbbf24; border-color: rgba(234,179,8,0.35); }
        .etag-yellow .tag-dot { background: #eab308; }
        /* blue – 語氣問題 */
        .etag-blue { background: rgba(59,130,246,0.1); color: #1d4ed8; border: 1px solid rgba(59,130,246,0.28); }
        .dark .etag-blue { background: rgba(59,130,246,0.18); color: #60a5fa; border-color: rgba(59,130,246,0.35); }
        .etag-blue .tag-dot { background: #3b82f6; }
        /* perfect – 無錯誤 */
        .etag-perfect { background: rgba(16,185,129,0.1); color: #047857; border: 1px solid rgba(16,185,129,0.28); }
        .dark .etag-perfect { background: rgba(16,185,129,0.18); color: #34d399; border-color: rgba(16,185,129,0.35); }
        .etag-perfect .tag-dot { background: #10b981; }

        /* ── Evaluation section ── */
        .eval-section {
            border-top: 1px solid var(--card-border);
            padding: 14px 16px 16px;
            background: rgba(99,102,241,0.04);
        }
        .dark .eval-section { background: rgba(99,102,241,0.09); }

        .eval-header {
            display: flex; align-items: center; justify-content: space-between;
            margin-bottom: 12px;
        }
        .eval-header-label {
            display: flex; align-items: center; gap: 6px;
            font-size: 0.67rem; font-weight: 700;
            letter-spacing: 0.09em; text-transform: uppercase;
            color: #6366f1;
        }
        /* Indigo #6366f1 is too dark on dark backgrounds — lighten it */
        .dark .eval-header-label { color: #818cf8; }
        .dark .eval-header-label svg { stroke: #818cf8; }
        .eval-overall {
            font-size: 0.72rem; font-weight: 700;
            padding: 3px 10px; border-radius: 20px;
        }

        .eval-bars {
            display: flex; flex-direction: column; gap: 7px;
            margin-bottom: 13px;
        }
        .eval-bar-row {
            display: flex; align-items: center; gap: 8px;
        }
        .eval-bar-label {
            font-size: 0.71rem; color: var(--sub);
            width: 44px; flex-shrink: 0;
        }
        .eval-bar {
            flex: 1; height: 5px;
            background: var(--muted); border-radius: 3px;
            overflow: hidden;
        }
        .eval-bar-fill {
            height: 100%; border-radius: 3px;
            width: 0;
            transition: width 0.7s cubic-bezier(0.34,1.3,0.64,1);
        }
        .eval-bar-num {
            font-size: 0.71rem; font-weight: 600;
            color: var(--text); width: 12px;
            text-align: right; flex-shrink: 0;
        }

        .eval-items {
            display: flex; flex-direction: column; gap: 7px;
        }
        .eval-item {
            display: flex; align-items: flex-start; gap: 8px;
            font-size: 0.82rem; line-height: 1.55; color: var(--text);
        }
        .eval-icon { flex-shrink: 0; font-size: 0.88rem; line-height: 1.6; }
        .eval-better-block { display: flex; flex-direction: column; gap: 2px; }
        .eval-better-badge {
            font-size: 0.6rem; font-weight: 700;
            letter-spacing: 0.07em; text-transform: uppercase;
            color: var(--sub);
        }
        .eval-better-ja {
            font-size: 0.9rem; font-weight: 500;
            color: var(--primary);
            font-family: 'Noto Sans TC', sans-serif;
        }

        /* ── Start conversation button ── */
        .start-conv-wrap {
            margin-bottom: 14px;
            display: flex; flex-direction: column; gap: 6px;
        }
        .start-conv-btn {
            width: 100%;
            display: flex; align-items: center; justify-content: center; gap: 9px;
            padding: 13px 20px;
            background: linear-gradient(135deg, #A8C8E8, #C4B5E8);
            border: none; border-radius: 12px; cursor: pointer;
            font-family: inherit; font-size: 0.92rem; font-weight: 600;
            color: #fff;
            box-shadow: 0 4px 20px rgba(168,200,232,0.50);
            transition: transform 0.18s, box-shadow 0.18s, opacity 0.18s;
        }
        .start-conv-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(196,181,232,0.55); }
        .start-conv-btn:active { transform: translateY(0); }
        .start-conv-btn:disabled { opacity: 0.6; cursor: default; transform: none; }
        .start-conv-btn svg { width: 18px; height: 18px; fill: white; flex-shrink: 0; }
        .start-conv-hint {
            font-size: 0.75rem; color: var(--sub);
            text-align: center;
        }
        @media (max-width: 767px) {
            .start-conv-btn { padding: 14px 20px; font-size: 0.95rem; }
        }

        /* ── Audio loading placeholder ── */
        .audio-loading {
            display: flex; align-items: center; gap: 8px;
            padding: 8px 0;
            font-size: 0.75rem; color: var(--sub);
        }
        .audio-loading .spinner { display: block !important; flex-shrink: 0; }

        /* ── Empty state ── */
        .empty-state {
            width: 100%;
            display: flex; flex-direction: column; align-items: center;
            padding: 36px 20px;
            gap: 12px;
            color: var(--sub);
        }
        .empty-icon {
            width: 48px; height: 48px;
            background: var(--muted);
            border-radius: 50%;
            display: flex; align-items: center; justify-content: center;
        }
        .empty-icon svg { width: 22px; height: 22px; fill: var(--sub); }
        .empty-title { font-size: 0.88rem; font-weight: 500; color: var(--text); }
        .empty-desc  { font-size: 0.78rem; text-align: center; max-width: 240px; }

        /* ═══════════════════════════════════════
           ── Level colour themes ──
           N5 green / N3 blue(default) / N1 purple
           ═══════════════════════════════════════ */

        /* ── N5 初級：清新薄荷 ── */
        body.lv-n5 {
            --bg:            #F5FAF7;
            --surface:       #EAF5EE;
            --card-hover:    #F2FAF4;
            --card-border:   rgba(168,232,200,0.30);
            --muted:         rgba(168,232,200,0.14);
            --muted-border:  rgba(168,232,200,0.28);
            --text:          #2D3748;
            --sub:           rgba(45,55,72,0.50);
            --primary:       #A8D8B8;
            --primary-light: #C8EDD8;
            --primary-glow:  rgba(168,232,200,0.45);
            --primary-dim:   rgba(168,232,200,0.20);
            --accent:        #A8C8E8;
            --accent-dim:    rgba(168,200,232,0.18);
            --input-bg:      rgba(168,232,200,0.12);
        }
        body.lv-n5::before {
            background: radial-gradient(circle, rgba(168,232,200,0.20) 0%, transparent 65%);
        }
        body.lv-n5::after {
            background: radial-gradient(circle, rgba(168,200,232,0.12) 0%, transparent 65%);
        }

        /* ── N3 中級：溫柔粉藍（回歸預設暖色） ── */
        body.lv-n3 {
            --bg:            #FAFAF7;
            --surface:       #F2EFF9;
            --card-hover:    #F7F5FE;
            --card-border:   rgba(168,200,232,0.28);
            --muted:         rgba(168,200,232,0.14);
            --muted-border:  rgba(168,200,232,0.28);
            --text:          #2D3748;
            --sub:           rgba(45,55,72,0.50);
            --primary:       #A8C8E8;
            --primary-light: #C8DCF0;
            --primary-glow:  rgba(168,200,232,0.40);
            --primary-dim:   rgba(168,200,232,0.18);
            --accent:        #C4B5E8;
            --accent-dim:    rgba(196,181,232,0.18);
            --input-bg:      rgba(168,200,232,0.10);
        }

        /* ── N1 高級：優雅薰衣草 ── */
        body.lv-n1 {
            --bg:            #FAF7FF;
            --surface:       #F2EEFF;
            --card-hover:    #F7F3FF;
            --card-border:   rgba(196,181,232,0.30);
            --muted:         rgba(196,181,232,0.14);
            --muted-border:  rgba(196,181,232,0.28);
            --text:          #2D3748;
            --sub:           rgba(45,55,72,0.50);
            --primary:       #C4B5E8;
            --primary-light: #D8CDF0;
            --primary-glow:  rgba(196,181,232,0.45);
            --primary-dim:   rgba(196,181,232,0.20);
            --accent:        #A8C8E8;
            --accent-dim:    rgba(168,200,232,0.18);
            --input-bg:      rgba(196,181,232,0.12);
        }
        body.lv-n1::before {
            background: radial-gradient(circle, rgba(196,181,232,0.20) 0%, transparent 65%);
        }
        body.lv-n1::after {
            background: radial-gradient(circle, rgba(168,200,232,0.12) 0%, transparent 65%);
        }

        /* ── Dark + N5 (green-tinted slate) ── */
        body.dark.lv-n5 {
            --bg:            #0A1A10;
            --surface:       #112417;
            --card:          #162E1C;
            --card-hover:    #1D3D24;
            --text:          #F1F5F9;
            --sub:           #A7C4B0;   /* slightly green-tinted for N5 */
            --primary:       #4ADE80;
            --primary-light: #86EFAC;
            --primary-glow:  rgba(74,222,128,0.28);
            --primary-dim:   rgba(74,222,128,0.15);
            --card-border:   rgba(74,222,128,0.14);
            --muted:         rgba(74,222,128,0.08);
            --muted-border:  rgba(74,222,128,0.18);
            --accent:        #22C55E;
            --accent-dim:    rgba(34,197,94,0.14);
            --input-bg:      rgba(74,222,128,0.08);
        }

        /* ── Dark + N3 (slate — mirrors .dark base) ── */
        body.dark.lv-n3 {
            --bg:            #0F172A;
            --surface:       #1E293B;
            --card:          #1E293B;
            --card-hover:    #263548;
            --text:          #F1F5F9;
            --sub:           #94A3B8;
            --primary:       #38BDF8;
            --primary-light: #7DD3FC;
            --primary-glow:  rgba(56,189,248,0.28);
            --primary-dim:   rgba(56,189,248,0.15);
            --card-border:   rgba(255,255,255,0.10);
            --muted:         rgba(255,255,255,0.08);
            --muted-border:  rgba(255,255,255,0.14);
            --accent:        #2DD4BF;
            --accent-dim:    rgba(45,212,191,0.14);
            --input-bg:      rgba(255,255,255,0.08);
        }

        /* ── Dark + N1 (purple-tinted slate) ── */
        body.dark.lv-n1 {
            --bg:            #130E24;
            --surface:       #1D1635;
            --card:          #1D1635;
            --card-hover:    #271E42;
            --text:          #F1F5F9;
            --sub:           #B4A8D4;   /* slightly purple-tinted for N1 */
            --primary:       #A78BFA;
            --primary-light: #C4B5FD;
            --primary-glow:  rgba(167,139,250,0.28);
            --primary-dim:   rgba(167,139,250,0.15);
            --card-border:   rgba(167,139,250,0.14);
            --muted:         rgba(167,139,250,0.08);
            --muted-border:  rgba(167,139,250,0.18);
            --accent:        #8B5CF6;
            --accent-dim:    rgba(139,92,246,0.14);
            --input-bg:      rgba(167,139,250,0.08);
        }

        /* ── Stats strip ── */
        .stats-strip {
            width: 100%;
            display: flex; gap: 10px;
        }
        .stat-card {
            flex: 1;
            background: linear-gradient(145deg, #FFFFFF 0%, #FDFBFF 100%);
            border: 1px solid var(--card-border);
            border-radius: 14px;
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            padding: 11px 15px;
            display: flex; align-items: center; gap: 10px;
            box-shadow: 0 2px 12px rgba(0,0,0,0.06);
            transition: transform 0.22s;
        }
        .dark .stat-card { background: var(--card); }
        .stat-card:hover { transform: translateY(-1px); }
        .stat-icon { font-size: 1.3rem; flex-shrink: 0; line-height: 1; }
        .stat-body { display: flex; flex-direction: column; gap: 1px; }
        .stat-value {
            font-size: 1.6rem; font-weight: 800; line-height: 1;
            color: var(--text);
            font-variant-numeric: tabular-nums;
            letter-spacing: -0.02em;
            transition: color 0.4s;
        }
        .stat-label {
            font-size: 0.63rem; font-weight: 600;
            color: var(--sub);
            letter-spacing: 0.05em; text-transform: uppercase;
        }
        @keyframes stat-pop {
            0%   { transform: scale(1); }
            40%  { transform: scale(1.18); color: var(--primary); }
            100% { transform: scale(1); }
        }
        .stat-value.pop { animation: stat-pop 0.5s ease both; }

        /* ── Waveform ── */
        .waveform-wrap {
            width: 100%; height: 44px;
            margin-bottom: 14px;
            border-radius: 10px;
            overflow: hidden;
            background: var(--muted);
        }
        #waveform { width: 100%; height: 100%; display: block; }

        /* ── Rich status animations ── */
        @keyframes pulse-ring {
            0%   { transform: scale(0.7); opacity: 1; }
            100% { transform: scale(2);   opacity: 0; }
        }
        .s-pulse {
            position: relative; width: 8px; height: 8px;
            flex-shrink: 0; display: inline-flex;
        }
        .s-pulse-dot {
            position: absolute; inset: 0; border-radius: 50%;
            background: var(--primary);
        }
        .s-pulse-ring {
            position: absolute; inset: 0; border-radius: 50%;
            border: 1.5px solid var(--primary);
            animation: pulse-ring 1.3s ease-out infinite;
        }

        @keyframes bdot {
            0%, 70%, 100% { transform: translateY(0); }
            35%            { transform: translateY(-5px); }
        }
        .bdots {
            display: inline-flex; align-items: center; gap: 2px;
            margin-left: 2px;
        }
        .bdots span {
            display: inline-block;
            width: 3px; height: 3px; border-radius: 50%;
            background: currentColor;
            animation: bdot 1.1s ease-in-out infinite;
        }
        .bdots span:nth-child(2) { animation-delay: 0.16s; }
        .bdots span:nth-child(3) { animation-delay: 0.32s; }

        @keyframes note-float {
            0%, 100% { transform: translateY(0) rotate(-8deg); opacity: 0.65; }
            50%       { transform: translateY(-5px) rotate(8deg); opacity: 1; }
        }
        .note-ico {
            display: inline-block; font-style: normal;
            animation: note-float 0.85s ease-in-out infinite;
        }
        .note-ico + .note-ico { animation-delay: 0.28s; }

        /* ── Scene card ── */
        .scene-card {
            width: 100%;
            border-radius: 18px;
            background: linear-gradient(135deg,
                rgba(251,191,36,0.10) 0%,
                rgba(14,165,233,0.10) 55%,
                rgba(13,148,136,0.09) 100%);
            border: 1px solid rgba(251,191,36,0.28);
            backdrop-filter: blur(28px);
            -webkit-backdrop-filter: blur(28px);
            box-shadow: 0 4px 36px rgba(251,191,36,0.08), 0 2px 16px rgba(0,0,0,0.08);
            animation: fadeUp 0.4s ease both;
            overflow: hidden;
        }
        .dark .scene-card {
            background: linear-gradient(135deg,
                rgba(251,191,36,0.07) 0%,
                rgba(56,189,248,0.08) 55%,
                rgba(45,212,191,0.07) 100%);
            border-color: rgba(251,191,36,0.20);
        }

        .scene-header {
            display: flex; align-items: flex-start; gap: 16px;
            padding: 22px 22px 14px;
        }
        .scene-emoji-wrap {
            font-size: 3rem; line-height: 1;
            flex-shrink: 0;
            filter: drop-shadow(0 2px 8px rgba(0,0,0,0.15));
        }
        .scene-title-area { flex: 1; }
        .scene-badge {
            display: inline-block;
            font-size: 0.62rem; font-weight: 700;
            letter-spacing: 0.1em; text-transform: uppercase;
            color: #d97706;
            background: rgba(251,191,36,0.15);
            border: 1px solid rgba(251,191,36,0.3);
            border-radius: 6px;
            padding: 2px 8px;
            margin-bottom: 8px;
        }
        /* Amber badge text is legible on light but needs boosting on dark */
        .dark .scene-badge { color: #fbbf24; background: rgba(251,191,36,0.18); border-color: rgba(251,191,36,0.38); }
        .scene-desc {
            font-size: 0.875rem; line-height: 1.7;
            color: var(--text);
        }

        .scene-body {
            padding: 0 22px 20px;
            display: flex; flex-direction: column; gap: 12px;
        }

        .scene-opening {
            background: rgba(255,255,255,0.55);
            border: 1px solid rgba(255,255,255,0.85);
            border-radius: 12px;
            padding: 12px 14px;
        }
        .dark .scene-opening {
            background: rgba(255,255,255,0.07);
            border-color: rgba(255,255,255,0.14);
        }
        .scene-opening-label {
            font-size: 0.62rem; font-weight: 700;
            letter-spacing: 0.09em; text-transform: uppercase;
            color: var(--sub); margin-bottom: 7px;
        }
        .scene-opening-ja {
            font-size: 1rem; font-weight: 500;
            color: var(--primary);
            font-family: 'Noto Sans TC', sans-serif;
            margin-bottom: 3px;
        }
        .scene-opening-zh {
            font-size: 0.78rem; color: var(--sub);
        }

        .scene-vocab-row {
            display: flex; gap: 8px; flex-wrap: wrap;
        }
        .scene-vocab-item {
            background: rgba(14,165,233,0.08);
            border: 1px solid rgba(14,165,233,0.18);
            border-radius: 10px;
            padding: 8px 12px;
            flex: 1; min-width: 90px;
        }
        .dark .scene-vocab-item {
            background: rgba(56,189,248,0.10);
            border-color: rgba(56,189,248,0.22);
        }
        .scene-vocab-ja {
            font-size: 0.82rem; font-weight: 500;
            color: var(--text);
            font-family: 'Noto Sans TC', sans-serif;
            margin-bottom: 2px;
        }
        .scene-vocab-zh {
            font-size: 0.7rem; color: var(--sub);
        }

        /* ── Character selector ── */
        .char-section { margin-bottom: 18px; }

        .char-chips {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
        }

        .char-chip {
            display: flex; align-items: center; gap: 6px;
            padding: 6px 13px 6px 9px;
            background: #FFFFFF;
            border: 1.5px solid rgba(168,200,232,0.30);
            border-radius: 50px;
            cursor: pointer;
            font-size: 0.78rem; font-weight: 500;
            font-family: inherit;
            color: var(--sub);
            box-shadow: 0 2px 8px rgba(168,200,232,0.12);
            transition: all 0.18s;
            white-space: nowrap;
        }
        .dark .char-chip { background: var(--muted); border-color: var(--muted-border); box-shadow: none; }
        .char-chip:hover:not(.active) {
            color: var(--text);
            border-color: rgba(168,200,232,0.55);
            box-shadow: 0 3px 12px rgba(168,200,232,0.22);
            transform: translateY(-1px);
        }
        .char-chip.active {
            background: var(--cc-dim);
            border-color: var(--cc-color);
            color: var(--cc-color);
            font-weight: 600;
            box-shadow: 0 0 0 3px var(--cc-glow), 0 3px 10px var(--cc-glow);
            transform: translateY(-1px);
        }
        .char-chip-emoji { font-size: 1.05rem; line-height: 1; }

        /* Character detail card */
        .char-card {
            width: 100%;
            border-radius: 20px;
            background: var(--cc-bg);
            border: 1.5px solid var(--cc-border);
            backdrop-filter: blur(28px);
            -webkit-backdrop-filter: blur(28px);
            box-shadow: 0 6px 28px var(--cc-shadow), 0 1px 4px rgba(0,0,0,0.04);
            animation: fadeUp 0.38s ease both;
            overflow: hidden;
            display: flex; align-items: flex-start; gap: 16px;
            padding: 22px 24px;
        }
        .char-card-emoji {
            font-size: 3rem; line-height: 1;
            flex-shrink: 0;
            filter: drop-shadow(0 3px 10px rgba(0,0,0,0.12));
        }
        .char-card-body { flex: 1; min-width: 0; }
        .char-card-tag {
            display: inline-block;
            font-size: 0.6rem; font-weight: 700;
            letter-spacing: 0.1em; text-transform: uppercase;
            color: var(--cc-color);
            background: var(--cc-dim);
            border: 1px solid var(--cc-border);
            border-radius: 5px;
            padding: 2px 7px;
            margin-bottom: 6px;
        }
        .char-card-name {
            font-size: 1.05rem; font-weight: 700;
            color: var(--text);
            margin-bottom: 3px;
        }
        .char-card-intro {
            font-size: 0.8rem; color: var(--sub);
            line-height: 1.5; margin-bottom: 11px;
        }
        .char-card-sig {
            background: rgba(255,255,255,0.65);
            border: 1px solid rgba(255,255,255,0.90);
            border-radius: 13px;
            padding: 11px 14px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.04);
        }
        .dark .char-card-sig {
            background: rgba(255,255,255,0.07);
            border-color: rgba(255,255,255,0.14);
            box-shadow: none;
        }
        .char-card-sig-label {
            font-size: 0.6rem; font-weight: 700;
            letter-spacing: 0.09em; text-transform: uppercase;
            color: var(--sub); margin-bottom: 5px;
        }
        .char-card-sig-ja {
            font-size: 0.9rem; font-weight: 500;
            color: var(--cc-color);
            font-family: 'Noto Sans TC', sans-serif;
            line-height: 1.5; margin-bottom: 3px;
        }
        .char-card-sig-zh {
            font-size: 0.74rem; color: var(--sub);
        }

        /* ══════════════════════════════════════════
           ── Responsive ──
           Desktop  > 1024px : full sidebar (default)
           Tablet 768–1024px : icon-only sidebar
           Mobile   < 768px  : bottom nav bar
           ══════════════════════════════════════════ */

        /* ── Tablet 768–1024px ── */
        @media (min-width: 768px) and (max-width: 1024px) {
            :root { --sb-w: 62px; }
            .sb-logo { padding: 16px 0; justify-content: center; gap: 0; }
            .sb-logo-name, .sb-logo-sub { display: none; }
            .sb-item { justify-content: center; padding: 11px 0; gap: 0; min-height: 44px; font-size: 14px; }
            .sb-icon { width: auto; }
            .sb-label, .sb-badge { display: none; }
            .sb-item.disabled::after { left: calc(100% + 8px); }
            .controls-row { grid-template-columns: 1fr; }
            .page { max-width: 720px; }
        }

        /* ── Mobile < 768px ── */
        @media (max-width: 767px) {
            :root { --sb-w: 0px; }

            /* Hamburger button (fixed top-left) */
            .sb-hamburger {
                display: flex;
                position: fixed;
                top: 12px; left: 12px;
                z-index: 500;
                width: 40px; height: 40px;
                background: var(--card);
                border: 1px solid var(--card-border);
                border-radius: 10px;
                align-items: center; justify-content: center;
                cursor: pointer;
                box-shadow: 0 2px 8px rgba(0,0,0,0.10);
            }
            .sb-hamburger svg { width: 20px; height: 20px; stroke: var(--text); }

            /* Sidebar: left drawer overlay */
            .sidebar {
                width: 240px;
                height: 100%;
                top: 0; left: 0; bottom: 0; right: auto;
                flex-direction: column;
                transform: translateX(-100%);
                transition: transform 0.25s cubic-bezier(0.4,0,0.2,1);
                z-index: 400;
                border-right: 1px solid var(--card-border);
                border-top: none;
            }
            .sidebar.mobile-open { transform: translateX(0); }

            /* Backdrop */
            .sb-backdrop {
                display: none;
                position: fixed; inset: 0;
                background: rgba(0,0,0,0.35);
                z-index: 399;
            }
            .sb-backdrop.visible { display: block; }

            /* Sidebar inner layout resets */
            .sb-logo { display: flex; }
            .sb-nav { flex-direction: column; padding: 6px 8px; gap: 2px; flex: 1; }
            .sb-footer { border-top: 1px solid var(--card-border); padding: 8px; }
            .sb-user { background: var(--card); border: 1px solid var(--card-border); margin: 8px; padding: 10px 12px; gap: 8px; }
            .sb-user-info { display: flex; }
            .sb-avatar { width: 32px; height: 32px; font-size: 0.8rem; }
            .sb-logout-btn { width: 34px; height: 34px; }
            .sb-logout-btn svg { width: 16px; height: 16px; }
            .sb-item { flex-direction: row; gap: 10px; padding: 10px 12px; justify-content: flex-start; flex: none; min-height: 44px; font-size: 0.88rem; }
            .sb-label { display: block; font-size: 0.88rem; }
            .sb-icon { width: 22px; }
            .sb-badge { display: flex; }

            /* Content layout */
            .content-wrap {
                margin-left: 0;
                padding-top: 56px;
                padding-bottom: 0;
            }
            .page { padding: 18px 12px 16px; gap: 12px; }

            /* Typography */
            h1 { font-size: 1.6rem; }
            .subtitle { font-size: 0.83rem; }
            .msg-text { font-size: 1rem; line-height: 1.75; }
            .feedback-body { font-size: 0.88rem; line-height: 1.8; }
            .eval-item { font-size: 0.85rem; }
            .turn-meta { font-size: 0.65rem; }

            /* Controls card */
            .controls-card { padding: 14px 14px 16px; }
            .controls-row {
                grid-template-columns: 1fr;
                gap: 12px;
                margin-bottom: 14px;
            }

            /* Level buttons: full-width, bigger tap target */
            .level-selector { width: 100%; }
            .level-btn {
                flex: 1; padding: 10px 4px;
                font-size: 0.88rem; min-height: 44px;
            }
            .level-tag { font-size: 0.62rem; }

            /* Topic select: taller tap target */
            .topic-select {
                padding: 11px 32px 11px 12px;
                font-size: 0.9rem; min-height: 44px;
            }

            /* Record button: thumb-friendly */
            .record-btn { width: 80px; height: 80px; }
            .record-btn svg { width: 30px; height: 30px; }
            .record-hint { font-size: 0.9rem; }

            /* Copy button: bigger tap area */
            .copy-btn { padding: 6px 10px; min-height: 32px; }

            /* Character chips: horizontal scroll strip */
            .char-chips {
                flex-wrap: nowrap;
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
                scroll-snap-type: x mandatory;
                padding-bottom: 4px;
                scrollbar-width: none;
            }
            .char-chips::-webkit-scrollbar { display: none; }
            .char-chip {
                flex-shrink: 0;
                scroll-snap-align: start;
                min-height: 40px;
                padding: 8px 14px 8px 9px;
                font-size: 0.82rem;
            }

            /* Character detail card: compact */
            .char-card { padding: 14px 16px; gap: 12px; }
            .char-card-emoji { font-size: 2.2rem; }
            .char-card-name { font-size: 0.95rem; }
            .char-card-intro { font-size: 0.78rem; margin-bottom: 8px; }
            .char-card-sig { padding: 8px 11px; }
            .char-card-sig-ja { font-size: 0.85rem; }

            /* Scene card: compact, hide vocab */
            .scene-header { padding: 12px 14px 8px; gap: 10px; }
            .scene-emoji-wrap { font-size: 2rem; }
            .scene-desc { font-size: 0.82rem; }
            .scene-body { padding: 0 14px 12px; gap: 8px; }
            .scene-vocab-row { display: none; }
            .scene-opening { padding: 9px 11px; }
            .scene-opening-ja { font-size: 0.92rem; }
            .scene-opening-zh { font-size: 0.75rem; }

            /* Stats strip: tighter */
            .stats-strip { gap: 7px; }
            .stat-card { padding: 9px 10px; gap: 7px; }
            .stat-icon { font-size: 1.1rem; }
            .stat-value { font-size: 1.1rem; }
            .stat-label { font-size: 0.59rem; }

            /* Turn cards */
            .turn-body { padding: 12px 14px; gap: 10px; }
            .turn-audio { padding: 0 14px 12px; }
            .feedback-section { padding: 12px 14px 14px; }
            .eval-section { padding: 12px 14px 14px; }

            /* Eval bars */
            .eval-bar-label { font-size: 0.68rem; width: 40px; }

            /* Waveform: slightly shorter */
            .waveform-wrap { height: 38px; }

            /* Hero: less margin */
            .hero { margin-bottom: 4px; }
            .hero-badge { font-size: 0.68rem; margin-bottom: 12px; }

            /* Auth card: tighter on small screens */
            .auth-card { padding: 24px 20px 22px; gap: 16px; border-radius: 18px; }
            .auth-brand-mark { width: 36px; height: 36px; font-size: 1rem; }
            .auth-brand-name { font-size: 1.05rem; }
            .auth-input { padding: 10px 14px; font-size: 0.93rem; }
            .auth-submit-btn { padding: 12px; font-size: 0.93rem; }

            /* Ensure no horizontal overflow */
            .page, .card, .controls-card, .turn-card { max-width: 100%; overflow: hidden; }
            img, video, audio { max-width: 100%; }
        }

        /* ════════════════════════════════════════
           ── Page visibility ──
           ════════════════════════════════════════ */
        .page.hidden { display: none !important; }

        /* ════════════════════════════════════════
           ── Listening Page ──
           ════════════════════════════════════════ */

        /* Player card */
        .listen-player-card {
            width: 100%;
            background: linear-gradient(145deg, #FFFFFF 0%, #F7F3FF 100%);
            border: 1.5px solid rgba(196,181,232,0.28);
            border-radius: 20px;
            box-shadow: 0 4px 20px rgba(196,181,232,0.20), 0 1px 4px rgba(0,0,0,0.04);
            padding: 24px;
            display: flex; flex-direction: column; align-items: center; gap: 18px;
        }
        .dark .listen-player-card { background: var(--card); }

        .listen-title-row {
            width: 100%; display: flex; align-items: center; gap: 10px;
        }
        .listen-badge {
            font-size: 0.6rem; font-weight: 700; letter-spacing: 0.1em;
            text-transform: uppercase; padding: 3px 9px; border-radius: 20px;
            background: linear-gradient(135deg,rgba(168,200,232,0.22),rgba(196,181,232,0.18));
            border: 1px solid rgba(196,181,232,0.38); color: #5B4080; flex-shrink: 0;
        }
        .listen-title {
            font-size: 1rem; font-weight: 700; color: var(--text);
            flex: 1; min-width: 0;
        }
        .listen-speakers {
            display: flex; gap: 8px; flex-wrap: wrap;
            width: 100%;
        }
        .listen-speaker-chip {
            font-size: 0.74rem; padding: 3px 10px; border-radius: 20px;
            background: rgba(168,200,232,0.14); border: 1px solid rgba(168,200,232,0.28);
            color: var(--sub);
        }

        /* Big play button */
        .listen-play-btn {
            width: 72px; height: 72px; border-radius: 50%;
            background: linear-gradient(135deg, #A8C8E8, #C4B5E8);
            border: none; cursor: pointer;
            display: flex; align-items: center; justify-content: center;
            box-shadow: 0 6px 24px rgba(168,200,232,0.55);
            transition: transform 0.18s, box-shadow 0.18s;
            flex-shrink: 0;
            animation: breathe 3.2s ease-in-out infinite;
        }
        .listen-play-btn:hover  { animation: none; transform: scale(1.08); box-shadow: 0 8px 32px rgba(196,181,232,0.60); }
        .listen-play-btn:active { animation: none; transform: scale(0.95); }
        .listen-play-btn.playing { background: linear-gradient(135deg,#F4A8A8,#F8C4A8); box-shadow: 0 6px 24px rgba(244,168,168,0.50); animation: none; }
        .listen-play-btn svg { width: 28px; height: 28px; fill: white; transition: all 0.15s; }

        .listen-controls-row {
            display: flex; align-items: center; gap: 14px; width: 100%;
        }

        /* Progress bar */
        .listen-progress-wrap {
            flex: 1; display: flex; flex-direction: column; gap: 6px;
        }
        .listen-progress-bar {
            width: 100%; height: 6px; background: rgba(168,200,232,0.20);
            border-radius: 3px; overflow: hidden; cursor: pointer; position: relative;
        }
        .listen-progress-fill {
            height: 100%; border-radius: 3px; width: 0%;
            background: linear-gradient(90deg, #A8C8E8, #C4B5E8);
            transition: width 0.1s linear;
        }
        .listen-time-row {
            display: flex; justify-content: space-between;
            font-size: 0.68rem; color: var(--sub); font-variant-numeric: tabular-nums;
        }

        .listen-replay-count {
            font-size: 0.72rem; font-weight: 600; color: var(--sub);
            background: var(--muted); border: 1px solid var(--muted-border);
            border-radius: 20px; padding: 4px 10px; white-space: nowrap;
        }
        .listen-replay-count strong { color: var(--primary); }

        /* Replay btn */
        .listen-replay-btn {
            display: flex; align-items: center; justify-content: center;
            width: 36px; height: 36px; border-radius: 50%; border: 1.5px solid rgba(168,200,232,0.40);
            background: rgba(168,200,232,0.12); cursor: pointer;
            transition: all 0.18s; color: var(--sub); flex-shrink: 0;
        }
        .listen-replay-btn:hover { background: rgba(168,200,232,0.25); color: #6B9EC4; }
        .listen-replay-btn svg { width: 16px; height: 16px; }

        /* Generate button */
        .listen-gen-btn {
            width: 100%; padding: 13px;
            background: linear-gradient(135deg, #A8C8E8, #C4B5E8);
            border: none; border-radius: 14px; cursor: pointer;
            font-family: inherit; font-size: 0.92rem; font-weight: 600;
            color: #fff; box-shadow: 0 4px 18px rgba(168,200,232,0.45);
            display: flex; align-items: center; justify-content: center; gap: 8px;
            transition: transform 0.18s, box-shadow 0.18s, opacity 0.18s;
        }
        .listen-gen-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 22px rgba(196,181,232,0.55); }
        .listen-gen-btn:active { transform: translateY(0); }
        .listen-gen-btn:disabled { opacity: 0.55; cursor: default; transform: none; }
        .listen-gen-btn svg { width: 16px; height: 16px; fill: white; flex-shrink: 0; }

        /* Question card */
        .listen-q-card {
            width: 100%; background: var(--card);
            border: 1px solid var(--card-border); border-radius: 18px;
            box-shadow: 0 2px 16px rgba(168,200,232,0.14);
            overflow: hidden; animation: fadeUp 0.4s ease both;
        }
        .listen-q-header {
            padding: 14px 18px 10px;
            border-bottom: 1px solid var(--card-border);
            display: flex; align-items: center; gap: 8px;
        }
        .listen-q-num {
            width: 22px; height: 22px; border-radius: 50%; flex-shrink: 0;
            background: linear-gradient(135deg, #A8C8E8, #C4B5E8);
            color: white; font-size: 0.68rem; font-weight: 700;
            display: flex; align-items: center; justify-content: center;
        }
        .listen-q-text {
            font-size: 0.88rem; font-weight: 600; color: var(--text); flex: 1;
        }
        .listen-q-type-badge {
            font-size: 0.6rem; font-weight: 700; letter-spacing: 0.07em;
            padding: 2px 8px; border-radius: 20px;
            background: rgba(196,181,232,0.15); color: #5B4080;
            border: 1px solid rgba(196,181,232,0.28);
        }
        .listen-q-body { padding: 12px 18px 16px; }

        /* Choice options */
        .listen-options { display: flex; flex-direction: column; gap: 8px; }
        .listen-option {
            display: flex; align-items: center; gap: 10px;
            padding: 10px 14px; border-radius: 12px;
            border: 1.5px solid var(--card-border);
            background: var(--muted); cursor: pointer;
            font-size: 0.85rem; color: var(--text);
            transition: all 0.18s; text-align: left;
            font-family: inherit; width: 100%;
        }
        .listen-option:hover { border-color: rgba(168,200,232,0.55); background: rgba(168,200,232,0.12); }
        .listen-option.selected {
            background: linear-gradient(135deg,rgba(168,200,232,0.22),rgba(196,181,232,0.16));
            border-color: rgba(168,200,232,0.60); color: #6B9EC4; font-weight: 600;
        }
        .listen-option.correct { background: rgba(168,232,200,0.20); border-color: rgba(168,232,200,0.60); color: #3D8F66; }
        .listen-option.wrong   { background: rgba(244,168,168,0.18); border-color: rgba(244,168,168,0.50); color: #C05050; }
        .listen-option-letter {
            width: 22px; height: 22px; border-radius: 50%; flex-shrink: 0;
            border: 1.5px solid currentColor; opacity: 0.7;
            font-size: 0.68rem; font-weight: 700;
            display: flex; align-items: center; justify-content: center;
        }

        /* Short answer input */
        .listen-short-input {
            width: 100%; padding: 10px 14px;
            background: var(--input-bg); border: 1.5px solid var(--card-border);
            border-radius: 12px; font-family: 'Noto Sans TC', sans-serif;
            font-size: 0.9rem; color: var(--text);
            outline: none; transition: border-color 0.2s;
            resize: none;
        }
        .listen-short-input:focus { border-color: rgba(196,181,232,0.60); }
        .listen-short-input::placeholder { color: #6B7280; }

        /* Submit + result */
        .listen-submit-btn {
            width: 100%; padding: 13px;
            background: linear-gradient(135deg, #A8C8E8, #C4B5E8);
            border: none; border-radius: 14px; cursor: pointer;
            font-family: inherit; font-size: 0.92rem; font-weight: 600; color: #fff;
            box-shadow: 0 4px 18px rgba(168,200,232,0.45);
            display: flex; align-items: center; justify-content: center; gap: 8px;
            transition: transform 0.18s, box-shadow 0.18s, opacity 0.18s;
        }
        .listen-submit-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 22px rgba(196,181,232,0.55); }
        .listen-submit-btn:active { transform: translateY(0); }
        .listen-submit-btn:disabled { opacity: 0.55; cursor: default; transform: none; }

        /* Result card */
        .listen-result-card {
            width: 100%; background: var(--card);
            border: 1px solid var(--card-border); border-radius: 18px;
            overflow: hidden; animation: fadeUp 0.45s ease both;
            box-shadow: 0 4px 20px rgba(168,200,232,0.16);
        }
        .listen-result-score-band {
            padding: 22px 20px;
            background: linear-gradient(135deg, rgba(168,200,232,0.15), rgba(196,181,232,0.12));
            border-bottom: 1px solid var(--card-border);
            display: flex; align-items: center; gap: 18px;
        }
        .listen-score-circle {
            width: 68px; height: 68px; border-radius: 50%; flex-shrink: 0;
            background: linear-gradient(135deg, #A8C8E8, #C4B5E8);
            display: flex; flex-direction: column; align-items: center; justify-content: center;
            box-shadow: 0 4px 16px rgba(168,200,232,0.45);
            animation: scoreReveal 0.5s cubic-bezier(0.34,1.56,0.64,1) both;
        }
        .listen-score-num { font-size: 1.5rem; font-weight: 800; color: #fff; line-height: 1; letter-spacing: -0.02em; }
        .listen-score-label { font-size: 0.55rem; color: rgba(255,255,255,0.85); font-weight: 600; letter-spacing: 0.06em; }
        .listen-result-meta { flex: 1; min-width: 0; }
        .listen-result-title { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 4px; }
        .listen-result-sub { font-size: 0.8rem; color: var(--sub); }

        .listen-result-body { padding: 16px 20px; display: flex; flex-direction: column; gap: 12px; }
        .listen-result-item {
            border-radius: 12px; overflow: hidden;
            border: 1.5px solid var(--card-border);
        }
        .listen-result-item-header {
            padding: 10px 14px; display: flex; align-items: center; gap: 8px;
            font-size: 0.83rem; font-weight: 600; color: var(--text);
        }
        .listen-result-item.correct-item { border-color: rgba(168,232,200,0.50); }
        .listen-result-item.wrong-item   { border-color: rgba(244,168,168,0.50); }
        .listen-result-item.correct-item .listen-result-item-header { background: rgba(168,232,200,0.12); }
        .listen-result-item.wrong-item   .listen-result-item-header { background: rgba(244,168,168,0.10); }
        .listen-result-verdict { font-size: 0.78rem; padding: 2px 8px; border-radius: 20px; font-weight: 700; margin-left: auto; }
        .verdict-correct { background: rgba(168,232,200,0.25); color: #3D8F66; }
        .verdict-wrong   { background: rgba(244,168,168,0.22); color: #C05050; }
        .listen-result-expl {
            padding: 10px 14px;
            font-size: 0.8rem; color: var(--sub); line-height: 1.6;
            border-top: 1px solid var(--card-border);
        }
        .listen-result-correct-ans {
            font-size: 0.78rem; color: var(--text); font-weight: 500; margin-top: 4px;
        }
        .listen-result-correct-ans strong { color: #6B9EC4; }

        /* Listening page controls styling (reuse existing .level-btn etc) */
        .listen-topic-chips { display: flex; flex-wrap: wrap; gap: 6px; }
        .listen-topic-chip {
            padding: 6px 13px; border-radius: 20px; cursor: pointer;
            font-family: inherit; font-size: 0.78rem; font-weight: 500;
            background: #fff; border: 1.5px solid rgba(168,200,232,0.30);
            color: var(--sub); box-shadow: 0 2px 8px rgba(168,200,232,0.12);
            transition: all 0.18s; white-space: nowrap;
        }
        .dark .listen-topic-chip { background: var(--muted); border-color: var(--muted-border); box-shadow: none; }
        .listen-topic-chip:hover { border-color: rgba(168,200,232,0.55); color: var(--text); transform: translateY(-1px); }
        .listen-topic-chip.active {
            background: linear-gradient(135deg,rgba(168,200,232,0.25),rgba(196,181,232,0.20));
            border-color: rgba(168,200,232,0.55); color: #6B9EC4; font-weight: 600;
        }

        /* Loading skeleton for player */
        .listen-skeleton {
            width: 100%; height: 8px; border-radius: 4px;
            background: linear-gradient(90deg, var(--muted) 25%, rgba(168,200,232,0.18) 50%, var(--muted) 75%);
            background-size: 200% 100%;
            animation: shimmer 1.4s infinite;
        }

        /* ── Listening: Speed buttons ── */
        .listen-speed-btns { display:flex; gap:4px; align-items:center; }
        .listen-speed-btn {
            padding:4px 9px; border-radius:20px;
            border:1.5px solid var(--muted-border); background:transparent;
            color:var(--sub); font-size:0.7rem; font-weight:700; cursor:pointer;
            transition:all 0.15s;
        }
        .listen-speed-btn:hover { border-color:rgba(168,200,232,0.5); color:var(--text); }
        .listen-speed-btn.active { background:var(--primary); border-color:var(--primary); color:#fff; }

        /* ── Listening: Mode toggle ── */
        .listen-mode-row { display:flex; gap:8px; margin-bottom:4px; }
        .listen-mode-tab {
            flex:1; padding:9px 14px; border-radius:12px;
            border:1.5px solid var(--muted-border); background:transparent;
            color:var(--sub); font-size:0.82rem; font-weight:600; cursor:pointer;
            transition:all 0.2s; display:flex; align-items:center; justify-content:center; gap:6px;
        }
        .listen-mode-tab:hover { background:var(--muted); color:var(--text); border-color:rgba(168,200,232,0.5); }
        .listen-mode-tab.active {
            background:linear-gradient(135deg,var(--primary),var(--accent));
            border-color:transparent; color:#fff;
            box-shadow:0 4px 14px var(--primary-glow);
        }

        /* ── Listening: Context card ── */
        .listen-context-card {
            background:linear-gradient(135deg,rgba(196,181,232,0.12),rgba(168,200,232,0.10));
            border:1px solid rgba(196,181,232,0.30); border-radius:14px;
            padding:14px 18px; margin-bottom:14px;
            flex-direction:column; gap:8px;
        }
        .listen-context-scene { font-size:0.88rem; color:var(--text); font-weight:500; line-height:1.5; }
        .listen-context-roles { display:flex; flex-wrap:wrap; gap:6px; }
        .listen-context-role-chip {
            padding:3px 10px; border-radius:20px;
            background:rgba(196,181,232,0.20); border:1px solid rgba(196,181,232,0.40);
            font-size:0.75rem; font-weight:600; color:#7B6BAD;
        }
        .dark .listen-context-role-chip { color:var(--accent); background:rgba(196,181,232,0.12); }

        /* ── Listening: Shadow start button ── */
        .listen-shadow-start-btn {
            width:100%; padding:12px 20px;
            border-radius:14px; border:none;
            background:linear-gradient(135deg,var(--accent),#E8A8C8);
            color:#fff; font-size:0.9rem; font-weight:700; cursor:pointer;
            display:flex; align-items:center; justify-content:center; gap:8px;
            box-shadow:0 4px 16px rgba(196,181,232,0.50); transition:all 0.2s;
        }
        .listen-shadow-start-btn:hover { transform:translateY(-2px); box-shadow:0 6px 22px rgba(196,181,232,0.65); }
        .listen-shadow-listen-full-btn {
            width:100%; padding:9px 20px;
            border-radius:12px; border:2px solid var(--accent);
            background:transparent; color:var(--accent);
            font-size:0.85rem; font-weight:600; cursor:pointer;
            display:flex; align-items:center; justify-content:center; gap:6px;
            transition:all 0.2s;
        }
        .listen-shadow-listen-full-btn:hover { background:rgba(196,181,232,0.12); transform:translateY(-1px); }

        /* ── Listening: Transcript ── */
        .listen-transcript-toggle {
            width:100%; padding:10px 18px; border-radius:12px;
            border:1.5px dashed var(--muted-border); background:transparent;
            color:var(--sub); font-size:0.82rem; font-weight:600; cursor:pointer;
            transition:all 0.2s; display:flex; align-items:center; gap:8px;
        }
        .listen-transcript-toggle:hover { background:var(--muted); color:var(--text); border-color:rgba(168,200,232,0.5); }
        .listen-transcript-toggle.open { border-style:solid; color:var(--text); background:var(--muted); }
        .listen-transcript-card {
            background:var(--card); border:1px solid var(--card-border);
            border-radius:16px; padding:16px 20px; margin-top:8px;
            flex-direction:column; gap:4px;
        }
        .listen-transcript-line {
            display:flex; gap:10px; align-items:flex-start;
            padding:8px 10px; border-radius:10px;
            transition:background 0.25s, border-color 0.25s;
            border-left:3px solid transparent;
        }
        .listen-transcript-line.active { background:rgba(168,200,232,0.14); border-left-color:var(--primary); }
        .listen-transcript-speaker {
            flex-shrink:0; width:26px; height:26px; border-radius:50%;
            display:flex; align-items:center; justify-content:center;
            font-size:0.70rem; font-weight:800; color:#fff;
            background:linear-gradient(135deg,var(--primary),var(--accent));
        }
        .listen-transcript-line[data-speaker="B"] .listen-transcript-speaker {
            background:linear-gradient(135deg,var(--accent),#E8A8C8);
        }
        .listen-transcript-text { flex:1; font-size:0.9rem; line-height:1.65; color:var(--text); }
        .listen-vocab-word {
            cursor:pointer; border-bottom:1.5px dashed rgba(168,200,232,0.7);
            color:#5B8DC4; font-weight:600; transition:color 0.15s;
        }
        .listen-vocab-word:hover { color:var(--accent); border-bottom-color:var(--accent); }
        .listen-vocab-popup {
            position:fixed; z-index:800;
            background:var(--card); border:1px solid rgba(196,181,232,0.50);
            border-radius:12px; padding:10px 14px;
            box-shadow:0 8px 28px rgba(0,0,0,0.18); max-width:220px;
            pointer-events:none; opacity:0;
            transform:translateY(4px) scale(0.96);
            transition:all 0.18s ease;
        }
        .listen-vocab-popup.show { opacity:1; transform:translateY(0) scale(1); pointer-events:auto; }
        .listen-vocab-popup-word { font-size:1rem; font-weight:700; color:var(--text); margin-bottom:4px; }
        .listen-vocab-popup-meaning { font-size:0.82rem; color:var(--sub); }
        .listen-vocab-panel {
            flex-wrap:wrap; gap:6px; padding:10px 0 2px;
            border-top:1px solid var(--muted-border); margin-top:6px;
        }
        .listen-vocab-chip {
            padding:4px 12px; border-radius:20px;
            background:rgba(196,181,232,0.12); border:1px solid rgba(196,181,232,0.30);
            font-size:0.75rem; color:#7B6BAD; cursor:pointer; transition:all 0.15s; font-weight:600;
        }
        .listen-vocab-chip:hover { background:rgba(196,181,232,0.25); }
        .dark .listen-vocab-chip { color:var(--accent); }

        /* ── Listening: Shadowing overlay ── */
        .listen-shadow-overlay {
            position:fixed; inset:0; z-index:700;
            background:rgba(10,10,30,0.65);
            backdrop-filter:blur(8px); -webkit-backdrop-filter:blur(8px);
            display:flex; align-items:center; justify-content:center; padding:24px;
        }
        .listen-shadow-modal {
            background:var(--card); border:1px solid rgba(196,181,232,0.40);
            border-radius:24px; padding:32px 28px 28px;
            max-width:480px; width:100%;
            box-shadow:0 20px 60px rgba(0,0,0,0.30);
            display:flex; flex-direction:column; align-items:center; gap:16px; text-align:center;
            position:relative;
        }
        .listen-shadow-close { position:absolute; top:14px; right:14px; width:30px; height:30px; border-radius:50%; border:none; background:var(--muted); color:var(--sub); cursor:pointer; font-size:0.9rem; display:flex; align-items:center; justify-content:center; }
        .listen-shadow-progress { font-size:0.72rem; color:var(--sub); font-weight:700; letter-spacing:0.08em; text-transform:uppercase; }
        .listen-shadow-speaker-badge { display:flex; align-items:center; gap:6px; font-size:0.78rem; color:var(--sub); }
        .listen-shadow-speaker-icon { width:22px; height:22px; border-radius:50%; background:linear-gradient(135deg,var(--primary),var(--accent)); display:flex; align-items:center; justify-content:center; font-size:0.65rem; font-weight:800; color:#fff; }
        .listen-shadow-line-text { font-size:1.1rem; font-weight:600; color:var(--text); line-height:1.6; background:rgba(168,200,232,0.10); border-radius:12px; padding:14px 20px; width:100%; text-align:center; }
        .listen-shadow-instruction { font-size:0.85rem; color:var(--sub); }
        .listen-shadow-rec-btn { width:68px; height:68px; border-radius:50%; border:none; background:linear-gradient(135deg,var(--danger),#F8C4A8); box-shadow:0 6px 20px rgba(244,168,168,0.50); cursor:pointer; display:flex; align-items:center; justify-content:center; font-size:1.7rem; transition:all 0.2s; animation:breathe 3s infinite; }
        .listen-shadow-rec-btn.recording { animation:breathe 1.2s infinite; box-shadow:0 6px 28px rgba(244,168,168,0.80); }
        .listen-shadow-score-row { display:flex; align-items:center; gap:12px; background:rgba(168,200,232,0.10); border-radius:12px; padding:12px 16px; width:100%; }
        .listen-shadow-score-num { font-size:1.5rem; font-weight:800; color:var(--primary); }
        .listen-shadow-score-detail { font-size:0.82rem; color:var(--sub); text-align:left; white-space:pre-line; }
        .listen-shadow-btn-row { display:flex; gap:10px; width:100%; }
        .listen-shadow-replay-btn { flex:1; padding:10px 14px; border-radius:12px; border:1.5px solid var(--muted-border); background:transparent; color:var(--sub); font-size:0.83rem; font-weight:600; cursor:pointer; transition:all 0.2s; }
        .listen-shadow-replay-btn:hover { background:var(--muted); color:var(--text); }
        .listen-shadow-next-btn { flex:1; padding:10px 14px; border-radius:12px; border:none; background:linear-gradient(135deg,var(--primary),var(--accent)); color:#fff; font-size:0.83rem; font-weight:700; cursor:pointer; transition:all 0.2s; }
        .listen-shadow-next-btn:hover { opacity:0.9; transform:translateY(-1px); }
        .listen-shadow-final-score { font-size:2.8rem; font-weight:800; background:linear-gradient(135deg,var(--primary),var(--accent)); -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text; }
        .listen-shadow-final-msg { font-size:0.88rem; color:var(--sub); }

        /* ── Listening: Retry button ── */
        .listen-retry-btn {
            display:flex; align-items:center; justify-content:center; gap:8px;
            padding:12px 24px; border-radius:14px;
            border:1.5px solid var(--muted-border); background:transparent;
            color:var(--sub); font-size:0.88rem; font-weight:600; cursor:pointer;
            transition:all 0.2s; width:100%; margin-top:8px;
        }
        .listen-retry-btn:hover { background:rgba(168,200,232,0.12); border-color:rgba(168,200,232,0.5); color:var(--text); transform:translateY(-1px); }

        /* ════════════════════════════════════════
           ── Password Modal ──
           ════════════════════════════════════════ */
        .pw-overlay {
            position: fixed; inset: 0; z-index: 900;
            background: rgba(0,0,0,0.45);
            backdrop-filter: blur(6px);
            -webkit-backdrop-filter: blur(6px);
            display: flex; align-items: center; justify-content: center;
            padding: 20px;
            opacity: 0; pointer-events: none;
            transition: opacity 0.22s ease;
        }
        .pw-overlay.open { opacity: 1; pointer-events: auto; }

        .pw-modal {
            width: 100%; max-width: 360px;
            background: var(--card);
            border: 1px solid var(--card-border);
            border-radius: 20px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.28);
            padding: 28px 28px 24px;
            display: flex; flex-direction: column; gap: 18px;
            transform: translateY(16px) scale(0.97);
            transition: transform 0.22s ease;
        }
        .pw-overlay.open .pw-modal {
            transform: translateY(0) scale(1);
        }
        .pw-modal-icon {
            width: 44px; height: 44px;
            background: var(--primary-dim);
            border-radius: 14px;
            display: flex; align-items: center; justify-content: center;
        }
        .pw-modal-icon svg { width: 20px; height: 20px; stroke: var(--primary); }
        .pw-modal-title {
            font-size: 1.05rem; font-weight: 700;
            color: var(--text); margin-top: -4px;
        }
        .pw-modal-sub {
            font-size: 0.82rem; color: var(--sub);
            margin-top: 2px; line-height: 1.5;
        }
        .pw-input-wrap { position: relative; }
        .pw-input {
            width: 100%;
            padding: 11px 44px 11px 14px;
            background: var(--input-bg);
            border: 1.5px solid var(--card-border);
            border-radius: 11px;
            color: var(--text);
            font-family: inherit; font-size: 0.95rem;
            outline: none;
            transition: border-color 0.18s;
        }
        .pw-input:focus { border-color: var(--primary); }
        .pw-input.error { border-color: var(--danger); animation: shake 0.35s ease; }
        .pw-eye-btn {
            position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
            background: none; border: none; cursor: pointer;
            color: var(--sub); padding: 4px;
            display: flex; align-items: center;
            transition: color 0.15s;
        }
        .pw-eye-btn:hover { color: var(--text); }
        .pw-eye-btn svg { width: 16px; height: 16px; }
        .pw-error-msg {
            font-size: 0.78rem; color: var(--danger);
            display: flex; align-items: center; gap: 5px;
            height: 0; overflow: hidden;
            transition: height 0.18s ease;
        }
        .pw-error-msg.visible { height: 1.2rem; }
        .pw-actions {
            display: flex; gap: 10px;
        }
        .pw-cancel-btn {
            padding: 10px 18px;
            background: var(--muted); border: 1px solid var(--muted-border);
            border-radius: 10px; cursor: pointer;
            font-family: inherit; font-size: 0.86rem; font-weight: 500;
            color: var(--sub); transition: all 0.18s;
        }
        .pw-cancel-btn:hover { color: var(--text); border-color: var(--card-border); }
        .pw-confirm-btn {
            flex: 1;
            padding: 10px 18px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            border: none; border-radius: 10px; cursor: pointer;
            font-family: inherit; font-size: 0.86rem; font-weight: 600;
            color: #fff;
            box-shadow: 0 3px 12px var(--primary-glow);
            transition: transform 0.15s, box-shadow 0.15s;
        }
        .pw-confirm-btn:hover { transform: translateY(-1px); box-shadow: 0 5px 16px var(--primary-glow); }
        .pw-confirm-btn:active { transform: translateY(0); }

        @keyframes shake {
            0%,100% { transform: translateX(0); }
            20%,60%  { transform: translateX(-6px); }
            40%,80%  { transform: translateX(6px); }
        }

        /* ════════════════════════════════════════
           ── Writing Page ──
           ════════════════════════════════════════ */

        /* Question card */
        .writing-q-card {
            width: 100%;
            background: var(--card);
            border: 1px solid var(--card-border);
            border-radius: 18px;
            overflow: hidden;
            backdrop-filter: blur(28px);
            -webkit-backdrop-filter: blur(28px);
            box-shadow: 0 4px 40px rgba(0,0,0,0.12);
            animation: fadeUp 0.35s ease both;
        }
        .writing-q-header {
            display: flex; align-items: center; justify-content: space-between;
            padding: 12px 20px;
            border-bottom: 1px solid var(--card-border);
        }
        .writing-q-header-label {
            display: flex; align-items: center; gap: 7px;
            font-size: 0.67rem; font-weight: 700;
            letter-spacing: 0.09em; text-transform: uppercase;
            color: var(--primary);
        }
        .writing-q-header-label svg { width: 13px; height: 13px; stroke: var(--primary); }
        .writing-q-number {
            font-size: 0.72rem; font-weight: 700;
            padding: 3px 10px; border-radius: 20px;
            background: var(--primary-dim); color: var(--primary);
        }
        .writing-q-body { padding: 18px 20px 14px; }
        .writing-q-type {
            font-size: 0.65rem; font-weight: 700;
            letter-spacing: 0.1em; text-transform: uppercase;
            color: var(--sub); margin-bottom: 8px;
        }
        .writing-q-text {
            font-size: 1rem; font-weight: 500;
            color: var(--text); line-height: 1.65;
            font-family: 'Noto Sans TC', sans-serif;
            margin-bottom: 6px;
        }
        .writing-q-zh {
            font-size: 0.82rem; color: var(--sub); line-height: 1.6;
        }
        .writing-q-footer {
            display: flex; align-items: center; justify-content: space-between;
            padding: 10px 20px 14px; gap: 10px;
        }
        .writing-q-target {
            font-size: 0.72rem; color: var(--sub);
            background: var(--muted); border-radius: 6px;
            padding: 3px 10px;
        }
        .writing-shuffle-btn {
            display: flex; align-items: center; gap: 5px;
            padding: 6px 14px;
            background: var(--muted); border: 1px solid var(--muted-border);
            border-radius: 20px; cursor: pointer;
            font-family: inherit; font-size: 0.78rem; font-weight: 500;
            color: var(--sub); transition: all 0.18s;
        }
        .writing-shuffle-btn:hover { color: var(--text); border-color: var(--card-border); }
        .writing-shuffle-btn svg { width: 13px; height: 13px; stroke: currentColor; }

        /* Input card */
        .writing-input-card {
            width: 100%;
            background: var(--card);
            border: 1px solid var(--card-border);
            border-radius: 18px;
            overflow: hidden;
            backdrop-filter: blur(28px);
            -webkit-backdrop-filter: blur(28px);
            box-shadow: 0 4px 40px rgba(0,0,0,0.12);
        }
        .writing-input-header {
            display: flex; align-items: center; justify-content: space-between;
            padding: 12px 20px;
            border-bottom: 1px solid var(--card-border);
        }
        .writing-input-label {
            font-size: 0.67rem; font-weight: 700;
            letter-spacing: 0.09em; text-transform: uppercase;
            color: var(--sub);
        }
        .writing-char-count {
            font-size: 0.78rem; font-weight: 600;
            color: var(--sub);
            font-variant-numeric: tabular-nums;
            transition: color 0.2s;
        }
        .writing-char-count.target-met { color: var(--accent); }
        .writing-textarea {
            display: block; width: 100%;
            min-height: 180px;
            padding: 16px 20px;
            background: transparent; border: none; outline: none;
            resize: vertical;
            font-family: 'Noto Sans TC', sans-serif;
            font-size: 1rem; line-height: 1.85;
            color: var(--text);
        }
        .writing-textarea::placeholder { color: #6B7280; }
        .writing-actions {
            display: flex; align-items: center; gap: 10px;
            padding: 10px 16px 14px;
            border-top: 1px solid var(--card-border);
        }
        .writing-hint-btn {
            display: flex; align-items: center; gap: 5px;
            padding: 8px 14px;
            background: var(--muted); border: 1px solid var(--muted-border);
            border-radius: 10px; cursor: pointer;
            font-family: inherit; font-size: 0.82rem; font-weight: 500;
            color: var(--sub); white-space: nowrap;
            transition: all 0.18s;
        }
        .writing-hint-btn:hover { color: var(--text); border-color: var(--card-border); }
        .writing-hint-btn svg { width: 14px; height: 14px; stroke: currentColor; }
        .writing-submit-btn {
            flex: 1;
            display: flex; align-items: center; justify-content: center; gap: 7px;
            padding: 10px 20px;
            background: linear-gradient(135deg, #A8C8E8, #C4B5E8);
            border: none; border-radius: 12px; cursor: pointer;
            font-family: inherit; font-size: 0.88rem; font-weight: 600;
            color: #fff;
            box-shadow: 0 4px 16px rgba(168,200,232,0.45);
            transition: transform 0.18s, box-shadow 0.18s, opacity 0.18s;
        }
        .writing-submit-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(168,200,232,0.55); }
        .writing-submit-btn:active { transform: translateY(0); }
        .writing-submit-btn:disabled { opacity: 0.55; cursor: default; transform: none; }
        .writing-submit-btn svg { width: 15px; height: 15px; fill: white; flex-shrink: 0; }

        /* Hint toast */
        .hint-toast {
            width: 100%;
            background: rgba(245,158,11,0.07);
            border: 1px solid rgba(245,158,11,0.25);
            border-radius: 12px;
            padding: 12px 16px;
            font-size: 0.84rem; line-height: 1.7;
            color: var(--text);
            animation: fadeUp 0.3s ease both;
        }
        .dark .hint-toast { background: rgba(245,158,11,0.12); }
        .hint-toast-label {
            font-size: 0.65rem; font-weight: 700;
            letter-spacing: 0.08em; text-transform: uppercase;
            color: #f59e0b; margin-bottom: 6px;
        }

        /* Writing result card */
        .writing-result-card {
            width: 100%;
            background: var(--card);
            border: 1px solid var(--card-border);
            border-radius: 18px;
            overflow: hidden;
            backdrop-filter: blur(28px);
            -webkit-backdrop-filter: blur(28px);
            box-shadow: 0 4px 40px rgba(0,0,0,0.16);
            animation: fadeUp 0.38s ease both;
        }
        .wr-header {
            display: flex; align-items: center; justify-content: space-between;
            padding: 13px 20px;
            border-bottom: 1px solid var(--card-border);
            background: rgba(99,102,241,0.04);
        }
        .dark .wr-header { background: rgba(99,102,241,0.09); }
        .wr-header-label {
            display: flex; align-items: center; gap: 7px;
            font-size: 0.67rem; font-weight: 700;
            letter-spacing: 0.09em; text-transform: uppercase;
            color: #6366f1;
        }
        .dark .wr-header-label { color: #818cf8; }
        .wr-overall {
            font-size: 0.82rem; font-weight: 700;
            padding: 3px 12px; border-radius: 20px;
        }
        .wr-scores {
            padding: 14px 20px 12px;
            border-bottom: 1px solid var(--card-border);
        }
        .wr-score-row {
            display: flex; align-items: center; gap: 10px;
            margin-bottom: 8px;
        }
        .wr-score-row:last-child { margin-bottom: 0; }
        .wr-score-label {
            font-size: 0.72rem; color: var(--sub);
            width: 56px; flex-shrink: 0;
        }
        .wr-score-bar {
            flex: 1; height: 6px;
            background: var(--muted); border-radius: 3px; overflow: hidden;
        }
        .wr-score-fill {
            height: 100%; border-radius: 3px;
            width: 0;
            transition: width 0.7s cubic-bezier(0.34,1.3,0.64,1);
        }
        .wr-score-num {
            font-size: 0.72rem; font-weight: 700;
            color: var(--text); width: 24px;
            text-align: right; flex-shrink: 0;
        }
        .wr-section {
            padding: 13px 20px;
            border-bottom: 1px solid var(--card-border);
        }
        .wr-section:last-child { border-bottom: none; }
        .wr-section-title {
            font-size: 0.65rem; font-weight: 700;
            letter-spacing: 0.09em; text-transform: uppercase;
            color: var(--sub); margin-bottom: 10px;
        }
        .wr-error-item {
            background: rgba(239,68,68,0.06);
            border: 1px solid rgba(239,68,68,0.18);
            border-radius: 10px;
            padding: 10px 14px;
            margin-bottom: 8px;
        }
        .wr-error-item:last-child { margin-bottom: 0; }
        .dark .wr-error-item {
            background: rgba(248,113,113,0.08);
            border-color: rgba(248,113,113,0.22);
        }
        .wr-error-original {
            font-size: 0.88rem; font-weight: 500;
            color: var(--danger);
            font-family: 'Noto Sans TC', sans-serif;
            text-decoration: line-through;
            text-decoration-color: rgba(239,68,68,0.5);
            margin-bottom: 4px;
        }
        .wr-error-issue {
            font-size: 0.78rem; color: var(--sub);
            margin-bottom: 6px; line-height: 1.5;
        }
        .wr-error-corrected {
            font-size: 0.9rem; font-weight: 500;
            color: #16a34a;
            font-family: 'Noto Sans TC', sans-serif;
        }
        .dark .wr-error-corrected { color: #4ade80; }
        .wr-no-errors {
            font-size: 0.86rem; color: var(--accent);
            display: flex; align-items: center; gap: 7px;
        }
        .wr-corrected-text {
            font-size: 0.94rem; line-height: 1.9;
            color: var(--primary);
            font-family: 'Noto Sans TC', sans-serif;
            font-weight: 500;
            background: var(--primary-dim);
            border: 1px solid rgba(14,165,233,0.2);
            border-radius: 10px;
            padding: 12px 14px;
        }
        .wr-suggestion-section {
            padding: 13px 20px 16px;
            background: rgba(245,158,11,0.05);
        }
        .dark .wr-suggestion-section { background: rgba(245,158,11,0.08); }
        .wr-suggestion-text {
            font-size: 0.86rem; line-height: 1.7;
            color: var(--text);
        }

        /* Writing controls two-column layout */
        .wpage-controls {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            align-items: start;
        }

        /* Category chips */
        .wcat-chips {
            display: flex; gap: 5px; flex-wrap: wrap;
        }
        .wcat-chip {
            padding: 6px 12px;
            background: var(--muted); border: 1.5px solid var(--muted-border);
            border-radius: 20px; cursor: pointer;
            font-family: inherit; font-size: 0.78rem; font-weight: 500;
            color: var(--sub); transition: all 0.18s; white-space: nowrap;
        }
        .wcat-chip:hover:not(.active) { color: var(--text); border-color: var(--card-border); }
        .wcat-chip.active {
            background: linear-gradient(135deg, rgba(168,200,232,0.25), rgba(196,181,232,0.20));
            border-color: rgba(168,200,232,0.55); color: #6B9EC4; font-weight: 600;
        }

        /* Question header right side */
        .wq-header-right {
            display: flex; align-items: center; gap: 8px;
        }
        .wq-type-badge {
            font-size: 0.62rem; font-weight: 700;
            letter-spacing: 0.08em; text-transform: uppercase;
            padding: 3px 9px; border-radius: 6px;
            background: var(--primary-dim); color: var(--primary);
            white-space: nowrap;
        }

        /* Context block */
        .wq-context {
            background: rgba(245,158,11,0.07);
            border: 1px solid rgba(245,158,11,0.22);
            border-left: 3px solid #f59e0b;
            border-radius: 0 10px 10px 0;
            padding: 9px 13px;
            margin-bottom: 12px;
        }
        .dark .wq-context {
            background: rgba(245,158,11,0.10);
            border-color: rgba(245,158,11,0.28);
            border-left-color: #f59e0b;
        }
        .wq-context-label {
            font-size: 0.6rem; font-weight: 700;
            letter-spacing: 0.09em; text-transform: uppercase;
            color: #f59e0b; margin-bottom: 5px;
        }
        .wq-context-text {
            font-size: 0.82rem; line-height: 1.65;
            color: var(--text);
        }

        /* Angles chips row */
        .wq-angles {
            display: flex; gap: 5px; flex-wrap: wrap;
            margin-top: 10px;
        }
        .wq-angle-chip {
            padding: 3px 10px; border-radius: 6px;
            background: var(--muted); border: 1px solid var(--muted-border);
            font-size: 0.72rem; color: var(--sub); line-height: 1.5;
        }

        /* Loading skeleton */
        .wq-loading {
            padding: 18px 20px 16px;
            display: flex; flex-direction: column; gap: 10px;
        }
        .wq-skeleton {
            height: 13px; border-radius: 7px;
            background: linear-gradient(
                90deg,
                var(--muted) 25%,
                var(--muted-border) 50%,
                var(--muted) 75%
            );
            background-size: 200% 100%;
            animation: shimmer 1.4s ease-in-out infinite;
        }
        @keyframes shimmer {
            0%   { background-position: 200% 0; }
            100% { background-position: -200% 0; }
        }

        /* ── N5 Exercise Tabs ── */
        .exercise-tabs {
            display: flex; gap: 4px;
            background: var(--muted); border-radius: 12px; padding: 4px;
            width: 100%;
        }
        .ex-tab {
            flex: 1; padding: 9px 4px;
            background: transparent; border: none; border-radius: 8px;
            cursor: pointer; font-family: inherit; font-size: 0.82rem; font-weight: 500;
            color: var(--sub); transition: all 0.18s; text-align: center;
        }
        .ex-tab:hover { color: var(--text); }
        .ex-tab.active {
            background: linear-gradient(135deg, #A8C8E8, #C4B5E8);
            color: #fff; font-weight: 600;
            box-shadow: 0 2px 10px rgba(168,200,232,0.40);
        }
        @media (max-width: 767px) { .ex-tab { font-size: 0.78rem; } }

        /* ── Word display (造句) ── */
        .word-display-card {
            background: linear-gradient(135deg, var(--primary-dim), var(--accent-dim));
            border: 1px solid var(--card-border);
            border-radius: 14px; padding: 22px 20px;
            text-align: center; margin-bottom: 10px;
        }
        .word-main {
            font-size: 2.4rem; font-weight: 700;
            color: var(--primary); font-family: 'Noto Sans TC', sans-serif;
            line-height: 1.2;
        }
        .word-reading {
            font-size: 0.95rem; color: var(--sub);
            font-family: 'Noto Sans TC', sans-serif;
            margin: 6px 0 10px;
        }
        .word-pos-badge {
            display: inline-block;
            font-size: 0.65rem; font-weight: 700;
            letter-spacing: 0.08em; text-transform: uppercase;
            padding: 3px 10px; border-radius: 20px;
            background: var(--accent-dim); color: var(--accent);
            margin-bottom: 10px;
        }
        .word-meaning {
            font-size: 1.1rem; font-weight: 600;
            color: var(--text); margin-bottom: 8px;
        }
        .word-context-hint {
            font-size: 0.8rem; color: var(--sub); line-height: 1.5;
        }
        .word-example-block {
            background: var(--muted);
            border: 1px solid var(--muted-border);
            border-radius: 10px; padding: 10px 14px;
            margin-top: 8px;
        }
        .word-example-label {
            font-size: 0.62rem; font-weight: 700; letter-spacing: 0.08em;
            text-transform: uppercase; color: var(--sub); margin-bottom: 5px;
        }
        .word-example-ja {
            font-size: 0.9rem; color: var(--primary);
            font-family: 'Noto Sans TC', sans-serif;
        }

        /* ── Fill-in-blank display (填空) ── */
        .fill-display-card {
            border: 1px solid var(--card-border);
            border-radius: 14px; padding: 18px 20px;
            background: var(--muted);
        }
        .fill-label {
            font-size: 0.62rem; font-weight: 700; letter-spacing: 0.09em;
            text-transform: uppercase; color: var(--sub); margin-bottom: 12px;
        }
        .fill-sentence {
            font-size: 1.12rem; line-height: 2;
            color: var(--text); font-family: 'Noto Sans TC', sans-serif;
            font-weight: 500; margin-bottom: 10px;
        }
        .fill-blank-marker {
            display: inline-block; min-width: 52px;
            border-bottom: 2.5px solid var(--primary);
            color: var(--primary); text-align: center;
            font-weight: 700; padding: 0 4px; margin: 0 2px;
        }
        .fill-hint-text {
            font-size: 0.8rem; color: var(--sub); line-height: 1.5;
        }

        /* ── Scene display (看圖寫句) ── */
        .scene-display-card {
            border-radius: 14px; padding: 18px 20px;
            background: linear-gradient(135deg, rgba(251,191,36,0.08), rgba(14,165,233,0.08));
            border: 1px solid rgba(251,191,36,0.22);
        }
        .dark .scene-display-card {
            background: linear-gradient(135deg, rgba(251,191,36,0.10), rgba(56,189,248,0.08));
            border-color: rgba(251,191,36,0.28);
        }
        .scene-display-emoji {
            font-size: 2.8rem; line-height: 1; margin-bottom: 12px;
            filter: drop-shadow(0 2px 6px rgba(0,0,0,0.12));
        }
        .scene-display-zh {
            font-size: 0.9rem; line-height: 1.75; color: var(--text);
            margin-bottom: 12px;
        }
        .scene-keywords-row {
            display: flex; gap: 6px; flex-wrap: wrap;
        }
        .scene-keyword-chip {
            padding: 4px 10px; border-radius: 8px;
            background: rgba(14,165,233,0.10); border: 1px solid rgba(14,165,233,0.20);
            font-size: 0.78rem; color: var(--text);
            font-family: 'Noto Sans TC', sans-serif;
        }
        .dark .scene-keyword-chip {
            background: rgba(56,189,248,0.12); border-color: rgba(56,189,248,0.25);
        }

        /* ── N5 result card ── */
        .n5-result-card {
            width: 100%;
            background: var(--card); border: 1px solid var(--card-border);
            border-radius: 16px; overflow: hidden;
            box-shadow: 0 4px 32px rgba(0,0,0,0.12);
            animation: fadeUp 0.35s ease both;
        }
        .n5r-header {
            display: flex; align-items: center; justify-content: space-between;
            padding: 12px 18px;
            border-bottom: 1px solid var(--card-border);
            background: rgba(99,102,241,0.04);
        }
        .dark .n5r-header { background: rgba(99,102,241,0.09); }
        .n5r-header-label {
            font-size: 0.67rem; font-weight: 700; letter-spacing: 0.09em;
            text-transform: uppercase; color: #6366f1;
            display: flex; align-items: center; gap: 6px;
        }
        .dark .n5r-header-label { color: #818cf8; }
        .n5r-score-badge {
            font-size: 0.82rem; font-weight: 700;
            padding: 3px 12px; border-radius: 20px;
        }
        .n5r-section {
            padding: 12px 18px;
            border-bottom: 1px solid var(--card-border);
        }
        .n5r-section:last-child { border-bottom: none; }
        .n5r-section-title {
            font-size: 0.62rem; font-weight: 700; letter-spacing: 0.09em;
            text-transform: uppercase; color: var(--sub); margin-bottom: 8px;
        }
        .n5r-error-item {
            background: rgba(239,68,68,0.06); border: 1px solid rgba(239,68,68,0.18);
            border-radius: 9px; padding: 9px 13px; margin-bottom: 7px;
        }
        .n5r-error-item:last-child { margin-bottom: 0; }
        .dark .n5r-error-item { background: rgba(248,113,113,0.08); border-color: rgba(248,113,113,0.22); }
        .n5r-error-orig { font-size: 0.86rem; color: var(--danger); font-family: 'Noto Sans TC', sans-serif; text-decoration: line-through; margin-bottom: 3px; }
        .n5r-error-issue { font-size: 0.76rem; color: var(--sub); margin-bottom: 5px; }
        .n5r-error-fix { font-size: 0.88rem; color: #16a34a; font-family: 'Noto Sans TC', sans-serif; font-weight: 500; }
        .dark .n5r-error-fix { color: #4ade80; }
        .n5r-natural { font-size: 0.94rem; font-weight: 500; color: var(--primary); font-family: 'Noto Sans TC', sans-serif; background: var(--primary-dim); border: 1px solid rgba(14,165,233,0.2); border-radius: 9px; padding: 10px 13px; }
        .n5r-explanation { font-size: 0.84rem; line-height: 1.7; color: var(--text); }
        .n5r-encouragement {
            padding: 10px 18px 14px;
            background: rgba(245,158,11,0.05);
            font-size: 0.84rem; line-height: 1.65; color: var(--text);
        }
        .dark .n5r-encouragement { background: rgba(245,158,11,0.08); }
        /* Fill blank result */
        .n5r-blank-item {
            padding: 9px 13px; border-radius: 9px; margin-bottom: 7px;
            border: 1px solid;
        }
        .n5r-blank-item.correct { background: rgba(34,197,94,0.07); border-color: rgba(34,197,94,0.25); }
        .n5r-blank-item.wrong   { background: rgba(239,68,68,0.06); border-color: rgba(239,68,68,0.18); }
        .dark .n5r-blank-item.correct { background: rgba(74,222,128,0.08); border-color: rgba(74,222,128,0.28); }
        .dark .n5r-blank-item.wrong   { background: rgba(248,113,113,0.08); border-color: rgba(248,113,113,0.22); }
        .n5r-blank-row {
            display: flex; align-items: center; gap: 10px; margin-bottom: 5px;
        }
        .n5r-blank-icon { font-size: 1rem; flex-shrink: 0; }
        .n5r-blank-answer { font-size: 0.9rem; font-family: 'Noto Sans TC', sans-serif; }
        .n5r-blank-correct-show { color: #16a34a; font-weight: 600; }
        .dark .n5r-blank-correct-show { color: #4ade80; }
        .n5r-blank-explanation { font-size: 0.78rem; color: var(--sub); line-height: 1.5; }
        .n5r-no-errors { font-size: 0.86rem; color: var(--accent); display: flex; align-items: center; gap: 6px; }

        /* Mobile writing adjustments */
        @media (max-width: 767px) {
            .wpage-controls { grid-template-columns: 1fr; gap: 12px; }
            .writing-q-body { padding: 14px 16px 10px; }
            .writing-q-footer { padding: 8px 16px 12px; }
            .writing-textarea { padding: 14px 16px; min-height: 150px; }
            .writing-actions { padding: 10px 14px 12px; }
            .writing-q-text { font-size: 0.96rem; }
            .wq-type-badge { display: none; }
        }
        /* ════════════════════════════════════════
           ── Admin Page ──
           ════════════════════════════════════════ */
        .admin-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 12px; width: 100%; margin-bottom: 0;
        }
        @media (max-width: 900px) { .admin-grid { grid-template-columns: repeat(2, 1fr); } }
        @media (max-width: 500px) { .admin-grid { grid-template-columns: 1fr 1fr; } }
        .admin-stat {
            background: var(--card);
            border: 1px solid var(--card-border);
            border-radius: 16px; padding: 18px 20px;
            display: flex; flex-direction: column; gap: 6px;
        }
        .admin-stat-icon { font-size: 1.3rem; line-height: 1; }
        .admin-stat-value { font-size: 1.8rem; font-weight: 800; color: var(--text); line-height: 1; }
        .admin-stat-label { font-size: 0.75rem; color: var(--sub); font-weight: 500; }
        .admin-stat-accent .admin-stat-value { background: linear-gradient(135deg,var(--primary),var(--accent)); -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text; }

        /* ── Admin tab bar ── */
        .adm-tab-bar {
            display: flex; gap: 6px;
            width: 100%;
            border-bottom: 1px solid var(--card-border);
            padding-bottom: 0;
            margin-bottom: 16px;
        }
        .adm-tab-btn {
            padding: 8px 18px;
            border: none; border-bottom: 2px solid transparent;
            background: transparent;
            color: var(--sub); font-family: inherit;
            font-size: 0.85rem; font-weight: 600;
            cursor: pointer; transition: all 0.18s;
            margin-bottom: -1px;
        }
        .adm-tab-btn:hover { color: var(--text); }
        .adm-tab-btn.active {
            color: var(--primary);
            border-bottom-color: var(--primary);
        }
        /* ── Admin charts grid ── */
        .adm-charts-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 14px;
            width: 100%;
        }
        @media (max-width: 600px) {
            .adm-charts-grid { grid-template-columns: 1fr; }
        }
        /* ── Teacher management ── */
        .teacher-row {
            display: flex; align-items: center; gap: 12px;
            padding: 10px 16px;
            border-bottom: 1px solid var(--muted-border);
            cursor: pointer; transition: background 0.15s;
        }
        .teacher-row:last-child { border-bottom: none; }
        .teacher-row:hover { background: var(--card-hover); }
        .teacher-log-overlay {
            position: fixed; inset: 0; z-index: 500;
            background: rgba(0,0,0,0.45); backdrop-filter: blur(4px);
            display: flex; align-items: center; justify-content: center;
        }
        .teacher-log-panel {
            background: var(--card); border-radius: 18px;
            width: min(560px, 94vw); max-height: 80vh;
            overflow-y: auto; padding: 24px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
        }

        .admin-section-header {
            display: flex; align-items: center; justify-content: space-between;
            padding: 16px 20px 12px;
            border-bottom: 1px solid var(--muted-border);
        }
        .admin-section-title { font-size: 0.9rem; font-weight: 700; color: var(--text); }
        .admin-search {
            padding: 7px 14px; border-radius: 10px;
            border: 1.5px solid var(--muted-border);
            background: var(--input-bg); color: var(--text);
            font-size: 0.82rem; font-family: inherit; outline: none;
            width: 200px; transition: border-color 0.18s;
        }
        .admin-search:focus { border-color: rgba(168,200,232,0.60); }

        .admin-table-row {
            display: grid;
            grid-template-columns: 36px minmax(180px, 1.6fr) minmax(90px, 110px) minmax(72px, 88px) minmax(72px, 88px) minmax(120px, 150px) minmax(84px, 96px);
            align-items: center; gap: 8px;
            padding: 10px 20px;
            border-bottom: 1px solid var(--muted-border);
            cursor: pointer; transition: background 0.15s;
        }
        .admin-table-row:last-child { border-bottom: none; }
        .admin-table-row:hover { background: rgba(168,200,232,0.07); }
        .admin-table-head {
            grid-template-columns: 36px minmax(180px, 1.6fr) minmax(90px, 110px) minmax(72px, 88px) minmax(72px, 88px) minmax(120px, 150px) minmax(84px, 96px);
            cursor: default; background: var(--muted);
            border-radius: 0; padding: 8px 20px;
        }
        .admin-table-head:hover { background: var(--muted); }
        .admin-col-label { font-size: 0.68rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--sub); }
        .admin-cell { font-size: 0.82rem; color: var(--text); min-width: 0; }
        .admin-cell-sub { font-size: 0.72rem; color: var(--sub); margin-top: 1px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
        .admin-avatar-sm {
            width: 32px; height: 32px; border-radius: 50%;
            background: linear-gradient(135deg,var(--primary),var(--accent));
            display: flex; align-items: center; justify-content: center;
            font-size: 0.78rem; font-weight: 800; color: white; flex-shrink: 0;
        }
        .admin-score-pill {
            display: inline-block; padding: 2px 8px;
            border-radius: 20px; font-size: 0.75rem; font-weight: 700;
        }
        .admin-score-high { background: rgba(168,232,200,0.20); color: #3D8F66; }
        .admin-score-mid  { background: rgba(168,200,232,0.20); color: #6B9EC4; }
        .admin-score-low  { background: rgba(244,168,168,0.18); color: #C05050; }
        .admin-type-badge {
            display: inline-flex; align-items: center; gap: 4px;
            padding: 2px 8px; border-radius: 20px;
            font-size: 0.70rem; font-weight: 600;
        }
        .admin-type-speak  { background: rgba(168,200,232,0.18); color: #6B9EC4; }
        .admin-type-write  { background: rgba(196,181,232,0.18); color: #5B4080; }
        .admin-type-listen { background: rgba(168,232,200,0.18); color: #3D8F66; }

        /* Student detail overlay */
        .student-detail-overlay {
            position: fixed; inset: 0; z-index: 600;
            background: rgba(0,0,0,0.35);
            backdrop-filter: blur(4px);
            -webkit-backdrop-filter: blur(4px);
            display: flex; align-items: stretch; justify-content: flex-end;
        }
        .student-detail-panel {
            width: 100%; max-width: 520px;
            background: var(--bg);
            overflow-y: auto;
            display: flex; flex-direction: column;
            animation: slideInRight 0.25s ease;
        }
        @keyframes slideInRight { from { transform: translateX(40px); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
        .student-detail-header {
            display: flex; align-items: center; gap: 14px;
            padding: 24px 24px 16px;
            border-bottom: 1px solid var(--muted-border);
            background: var(--card); flex-shrink: 0;
        }
        .student-detail-close {
            width: 30px; height: 30px; border-radius: 8px;
            border: none; background: var(--muted);
            color: var(--sub); cursor: pointer;
            display: flex; align-items: center; justify-content: center;
            font-size: 1rem; margin-left: auto; transition: all 0.15s;
        }
        .student-detail-close:hover { background: rgba(244,168,168,0.20); color: #C05050; }
        .student-detail-body { padding: 16px 24px; flex: 1; display: flex; flex-direction: column; gap: 12px; }
        .admin-record-row {
            display: grid;
            grid-template-columns: auto 1fr auto auto;
            align-items: center; gap: 10px;
            padding: 10px 14px;
            background: var(--card); border-radius: 12px;
            border: 1px solid var(--card-border);
        }
        .admin-record-meta { font-size: 0.75rem; color: var(--sub); text-align: right; }

        /* Account management */
        .admin-mgmt-section {
            background: var(--card);
            border: 1px solid var(--card-border);
            border-radius: 16px; overflow: hidden;
        }
        .admin-mgmt-header {
            display: flex; align-items: center; gap: 10px;
            padding: 14px 20px;
            border-bottom: 1px solid var(--muted-border);
        }
        .admin-mgmt-lock {
            font-size: 0.78rem; color: var(--sub);
            display: flex; align-items: center; gap: 5px;
        }
        .admin-mgmt-body { padding: 16px 20px; display: flex; flex-direction: column; gap: 8px; }
        .admin-mgmt-pw-row {
            display: flex; gap: 8px; align-items: center; margin-bottom: 8px;
        }
        @keyframes spin { to { transform: rotate(360deg); } }
        .admin-sortable { cursor: pointer; user-select: none; }
        .admin-sortable:hover { color: var(--text); }
        .admin-sort-arrow { margin-left: 3px; opacity: 0.5; font-size: 0.65em; }
        .admin-sort-arrow.active { opacity: 1; color: var(--primary); }
        .teacher-assign-select {
            font-size: 0.72rem; padding: 3px 6px; border-radius: 8px;
            border: 1px solid var(--muted-border); background: var(--card);
            color: var(--text); cursor: pointer; max-width: 130px;
        }
        .admin-level-btn, .admin-assign-btn {
            padding: 4px 12px; border-radius: 20px; font-size: 0.75rem; font-weight: 600;
            border: 1px solid var(--muted-border); background: transparent; color: var(--sub);
            cursor: pointer; transition: all 0.15s;
        }
        .admin-level-btn:hover, .admin-assign-btn:hover { background: var(--muted); color: var(--text); }
        .admin-level-btn.active, .admin-assign-btn.active { background: rgba(168,200,232,0.20); color: #3A6A9A; border-color: rgba(168,200,232,0.5); }
        .admin-toggle-row {
            display: flex; align-items: center; gap: 12px;
            padding: 10px 12px; border-radius: 10px;
            border: 1px solid var(--muted-border);
        }
        .admin-toggle-row:hover { background: var(--muted); }
        .admin-toggle { position: relative; width: 36px; height: 20px; cursor: pointer; }
        .admin-toggle input { opacity: 0; width: 0; height: 0; }
        .admin-toggle-track {
            position: absolute; inset: 0;
            background: var(--muted-border); border-radius: 20px;
            transition: background 0.2s;
        }
        .admin-toggle input:checked + .admin-toggle-track { background: var(--danger); }
        .admin-toggle-track::before {
            content: ''; position: absolute;
            width: 14px; height: 14px; border-radius: 50%;
            background: white; top: 3px; left: 3px;
            transition: transform 0.2s;
        }
        .admin-toggle input:checked + .admin-toggle-track::before { transform: translateX(16px); }

        /* ════════════════════════════════════════
           ── Auth Page ──
           ════════════════════════════════════════ */
        .auth-page {
            position: fixed; inset: 0; z-index: 999;
            background: linear-gradient(135deg, #EBF3FA 0%, #EDE9F7 55%, #EFF5F0 100%);
            display: flex; align-items: center; justify-content: center;
            padding: 20px;
        }
        .dark .auth-page {
            background: linear-gradient(135deg, #0F172A 0%, #1a1535 60%, #0F1F18 100%);
        }
        .auth-card {
            width: 100%; max-width: 400px;
            background: var(--card);
            border: 1px solid var(--card-border);
            border-radius: 24px;
            padding: 36px 32px 32px;
            box-shadow: 0 20px 60px rgba(168,200,232,0.18), 0 4px 20px rgba(0,0,0,0.06);
            display: flex; flex-direction: column; gap: 20px;
        }
        .auth-brand {
            display: flex; align-items: center; gap: 14px;
            margin-bottom: 4px;
        }
        .auth-brand-mark {
            width: 44px; height: 44px;
            background: linear-gradient(135deg, #A8C8E8, #C4B5E8);
            border-radius: 13px;
            display: flex; align-items: center; justify-content: center;
            font-size: 1.2rem; font-weight: 700; color: white;
            box-shadow: 0 4px 14px rgba(168,200,232,0.45);
            flex-shrink: 0;
        }
        .auth-brand-name { font-size: 1.1rem; font-weight: 700; color: var(--text); }
        .auth-brand-sub  { font-size: 0.72rem; color: var(--sub); margin-top: 2px; }
        .auth-tabs {
            display: flex; gap: 4px;
            background: var(--muted);
            border-radius: 12px; padding: 4px;
        }
        .auth-tab {
            flex: 1; padding: 8px;
            border: none; border-radius: 9px;
            background: transparent;
            font-size: 0.85rem; font-weight: 600; color: var(--sub);
            cursor: pointer; transition: all 0.18s;
        }
        .auth-tab.active {
            background: var(--card);
            color: var(--text);
            box-shadow: 0 2px 8px rgba(168,200,232,0.25);
        }
        .auth-form { display: flex; flex-direction: column; gap: 10px; }
        .auth-input {
            width: 100%; padding: 12px 16px;
            border-radius: 12px;
            border: 1.5px solid var(--muted-border);
            background: var(--input-bg);
            color: var(--text); font-size: 0.9rem; font-family: inherit;
            outline: none; transition: border-color 0.18s;
        }
        .auth-input:focus { border-color: rgba(168,200,232,0.70); }
        .auth-input::placeholder { color: #6B7280; }
        .auth-submit-btn {
            padding: 13px;
            border-radius: 13px; border: none;
            background: linear-gradient(135deg, #A8C8E8, #C4B5E8);
            color: #fff; font-size: 0.92rem; font-weight: 700;
            cursor: pointer; transition: all 0.2s;
            box-shadow: 0 4px 14px rgba(168,200,232,0.40);
            display: flex; align-items: center; justify-content: center; gap: 8px;
        }
        .auth-submit-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(168,200,232,0.55); }
        .auth-submit-btn:active { transform: translateY(0); }
        .auth-submit-btn:disabled { opacity: 0.6; cursor: default; transform: none; }
        .auth-divider {
            display: flex; align-items: center; gap: 12px;
            color: var(--sub); font-size: 0.78rem;
        }
        .auth-divider::before, .auth-divider::after {
            content: ''; flex: 1;
            height: 1px; background: var(--muted-border);
        }
        .auth-google-btn {
            width: 100%; padding: 12px 16px;
            border-radius: 13px;
            border: 1.5px solid var(--muted-border);
            background: var(--card);
            color: var(--text); font-size: 0.88rem; font-weight: 600;
            cursor: pointer; transition: all 0.2s;
            display: flex; align-items: center; justify-content: center; gap: 10px;
        }
        .auth-google-btn:hover { border-color: rgba(168,200,232,0.55); background: var(--muted); }
        .auth-google-btn svg { width: 18px; height: 18px; flex-shrink: 0; }
        .auth-msg {
            padding: 10px 14px; border-radius: 10px;
            font-size: 0.82rem; font-weight: 500;
            display: none;
        }
        .auth-msg.error { background: rgba(244,168,168,0.15); color: #C05050; border: 1px solid rgba(244,168,168,0.40); }
        .auth-msg.success { background: rgba(168,232,200,0.15); color: #3D8F66; border: 1px solid rgba(168,232,200,0.40); }

        /* ── Remember me checkbox ── */
        .remember-me {
            display: flex; align-items: center; gap: 8px;
            cursor: pointer; user-select: none;
            font-size: 0.82rem; color: var(--sub);
            margin-top: -2px;
        }
        .remember-me input[type="checkbox"] {
            appearance: none; -webkit-appearance: none;
            width: 16px; height: 16px; flex-shrink: 0;
            border: 1.5px solid rgba(168,200,232,0.55);
            border-radius: 4px; background: var(--card);
            cursor: pointer; position: relative;
            transition: border-color 0.15s, background 0.15s;
        }
        .remember-me input[type="checkbox"]:checked {
            background: rgba(168,200,232,0.75);
            border-color: rgba(168,200,232,0.9);
        }
        .remember-me input[type="checkbox"]:checked::after {
            content: ''; position: absolute;
            left: 4px; top: 1px; width: 5px; height: 9px;
            border: 2px solid #fff; border-top: none; border-left: none;
            transform: rotate(45deg);
        }
        .remember-me input[type="checkbox"]:focus-visible {
            outline: 2px solid rgba(168,200,232,0.7); outline-offset: 2px;
        }

        /* ── Forgot password link ── */
        .auth-forgot-row { text-align: right; margin-top: -4px; }
        .auth-forgot-link {
            background: none; border: none; cursor: pointer;
            font-size: 0.78rem; color: #4B5563; text-decoration: underline;
            text-underline-offset: 2px; padding: 0; font-family: inherit;
            transition: color 0.15s;
        }
        .auth-forgot-link:hover { color: #315f99; }

        /* ── Forgot password modal ── */
        .fp-overlay {
            position: fixed; inset: 0; z-index: 7500;
            background: rgba(15,30,55,0.42); backdrop-filter: blur(6px);
            display: flex; align-items: center; justify-content: center;
            opacity: 0; pointer-events: none;
            transition: opacity 0.22s ease;
        }
        .fp-overlay.open { opacity: 1; pointer-events: auto; }
        .fp-modal {
            background: var(--card); border-radius: 22px;
            padding: 28px 24px 22px; width: min(360px, 92vw);
            box-shadow: 0 24px 60px rgba(26,53,80,0.18);
            border: 1px solid var(--card-border);
            transform: translateY(8px) scale(0.98);
            transition: transform 0.22s ease;
            display: flex; flex-direction: column; gap: 14px;
        }
        .fp-overlay.open .fp-modal { transform: translateY(0) scale(1); }
        .fp-modal-title {
            font-family: 'Cormorant Garamond', serif;
            font-size: 1.5rem; font-weight: 700;
            color: var(--text);
        }
        .fp-modal-sub { font-size: 0.84rem; color: #4B5563; line-height: 1.65; }
        .fp-email-input { width: 100%; }
        .fp-actions { display: flex; gap: 10px; }
        .fp-submit-btn {
            flex: 1; padding: 11px 14px; border: none; border-radius: 14px;
            background: linear-gradient(145deg, #315f99, #7f9fc6);
            color: #fff; font-family: inherit; font-size: 0.88rem;
            font-weight: 600; cursor: pointer;
            transition: opacity 0.15s;
        }
        .fp-submit-btn:disabled { opacity: 0.6; cursor: default; }
        .fp-cancel-btn {
            padding: 11px 14px; border-radius: 14px; border: 1px solid var(--card-border);
            background: transparent; color: #4B5563; font-family: inherit;
            font-size: 0.88rem; cursor: pointer; transition: background 0.15s;
        }
        .fp-cancel-btn:hover { background: rgba(168,200,232,0.12); }

        /* ── Toast notifications ── */
        #toast-container {
            position: fixed; top: 16px; right: 16px; z-index: 9900;
            display: flex; flex-direction: column; gap: 8px;
            pointer-events: none;
        }
        .toast {
            display: flex; align-items: center; gap: 10px;
            padding: 12px 16px; border-radius: 14px;
            background: #1A3550; color: #F9FAFB;
            font-size: 0.84rem; font-weight: 500; line-height: 1.4;
            box-shadow: 0 8px 24px rgba(26,53,80,0.28);
            border: 1px solid rgba(168,200,232,0.22);
            max-width: 300px; pointer-events: auto;
            animation: toast-in 0.28s cubic-bezier(0.34,1.56,0.64,1) both;
        }
        .toast.toast-out { animation: toast-out 0.22s ease forwards; }
        .toast-icon { flex-shrink: 0; font-size: 1rem; }
        .toast-error   { background: #3D1A1A; border-color: rgba(244,168,168,0.3); }
        .toast-warn    { background: #3D2E1A; border-color: rgba(255,200,80,0.3); }
        .toast-success { background: #1A3D2A; border-color: rgba(168,232,200,0.3); }
        @keyframes toast-in {
            from { transform: translateX(110%); opacity: 0; }
            to   { transform: translateX(0);    opacity: 1; }
        }
        @keyframes toast-out {
            to { transform: translateX(110%); opacity: 0; }
        }

        /* ── Sidebar: User profile section ── */
        .sb-user {
            display: flex; align-items: center; gap: 10px;
            padding: 10px 12px;
            margin: 0 8px 8px;
            border-radius: 12px;
            background: rgba(168,200,232,0.10);
            border: 1px solid var(--muted-border);
        }
        .sb-avatar {
            width: 34px; height: 34px; border-radius: 50%; flex-shrink: 0;
            background: linear-gradient(135deg, #A8C8E8, #C4B5E8);
            display: flex; align-items: center; justify-content: center;
            font-size: 0.85rem; font-weight: 800; color: white;
            overflow: hidden;
        }
        .sb-avatar img { width: 100%; height: 100%; object-fit: cover; }
        .sb-user-info { flex: 1; min-width: 0; }
        .sb-user-name { font-size: 0.82rem; font-weight: 700; color: var(--text); truncate; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
        .sb-user-streak { font-size: 0.70rem; color: var(--sub); margin-top: 1px; }
        .sb-logout-btn {
            flex-shrink: 0; width: 28px; height: 28px; border-radius: 8px;
            border: none; background: transparent; color: var(--sub);
            cursor: pointer; display: flex; align-items: center; justify-content: center;
            transition: all 0.15s;
        }
        .sb-logout-btn:hover { background: rgba(244,168,168,0.18); color: #C05050; }
        .sb-logout-btn svg { width: 14px; height: 14px; }

        /* ── Editorial redesign inspired by KUMO social posts ── */
        :root {
            --sb-w: 238px;
            --bg: #edf2f1;
            --surface: #f7faf8;
            --card: rgba(255,255,255,0.86);
            --card-hover: #ffffff;
            --card-border: rgba(96,122,146,0.22);
            --text: #1A3550;
            --sub: #2D4A6E;
            --muted: rgba(113,145,173,0.12);
            --muted-border: rgba(113,145,173,0.24);
            --primary: #315f99;
            --primary-light: #7f9fc6;
            --primary-glow: rgba(49,95,153,0.18);
            --primary-dim: rgba(49,95,153,0.1);
            --accent: #c193b1;
            --accent-dim: rgba(193,147,177,0.12);
            --danger: #cb7d7d;
            --danger-glow: rgba(203,125,125,0.22);
            --danger-dim: rgba(203,125,125,0.12);
            --green: #7ca798;
            --green-dim: rgba(124,167,152,0.16);
            --input-bg: rgba(255,255,255,0.9);
        }
        body {
            font-family: 'Noto Serif TC', serif;
            background:
                linear-gradient(rgba(108,140,167,0.08) 1px, transparent 1px),
                linear-gradient(90deg, rgba(108,140,167,0.08) 1px, transparent 1px),
                radial-gradient(circle at top left, rgba(205,223,234,0.85), transparent 34%),
                radial-gradient(circle at bottom right, rgba(236,221,234,0.75), transparent 30%),
                var(--bg);
            background-size: 33px 33px, 33px 33px, auto, auto, auto;
        }
        body::before, body::after {
            filter: blur(100px);
            opacity: 0.7;
        }
        .sidebar {
            background:
                linear-gradient(180deg, rgba(255,255,255,0.52), rgba(255,255,255,0.22)),
                repeating-linear-gradient(0deg, transparent 0 33px, rgba(86,118,145,0.06) 33px 34px),
                linear-gradient(160deg, #eef5f5 0%, #f4f8fb 50%, #f7f2f8 100%);
            border-right: 1px solid rgba(80,112,140,0.18);
            box-shadow: 10px 0 30px rgba(115,142,162,0.08);
        }
        .sb-logo {
            padding: 24px 18px 18px;
            border-bottom: 1px solid rgba(80,112,140,0.14);
        }
        .sb-logo-mark {
            width: 40px;
            height: 40px;
            border-radius: 12px;
            background: linear-gradient(145deg, #fefefe, #d8e7ef);
            color: var(--primary);
            border: 1px solid rgba(80,112,140,0.18);
            box-shadow: 0 8px 20px rgba(117,145,164,0.12);
            font-family: 'Noto Serif TC', serif;
            font-size: 1rem;
        }
        .sb-logo-name, h1, .hero-note-title, .empty-title {
            font-family: 'Cormorant Garamond', 'Noto Serif TC', serif;
        }
        .sb-logo-name {
            font-size: 1.35rem;
            color: var(--primary);
            letter-spacing: 0.04em;
        }
        .sb-logo-sub {
            font-size: 0.68rem;
            letter-spacing: 0.09em;
            text-transform: uppercase;
        }
        .sb-item {
            padding: 11px 13px;
            border-radius: 14px;
            border: 1px solid transparent;
            font-family: 'Noto Serif TC', serif;
        }
        .sb-item:hover:not(.disabled) {
            background: rgba(255,255,255,0.62);
            border-color: rgba(80,112,140,0.14);
        }
        .sb-item.active {
            background: rgba(255,255,255,0.82);
            color: var(--primary);
            border: 1px solid rgba(80,112,140,0.2);
            box-shadow: 0 8px 18px rgba(121,147,169,0.1);
        }
        .content-wrap {
            position: relative;
        }
        .page {
            max-width: 1020px;
            align-items: stretch;
            padding: 34px 28px 78px;
            gap: 18px;
        }
        .hero.hero-editorial {
            display: grid;
            grid-template-columns: minmax(0, 1.25fr) minmax(270px, 0.75fr);
            gap: 18px;
            width: 100%;
            text-align: left;
            margin-bottom: 6px;
        }
        .hero-board,
        .hero-note,
        .stat-card,
        .empty-state {
            background:
                linear-gradient(180deg, rgba(255,255,255,0.88), rgba(255,255,255,0.74)),
                repeating-linear-gradient(0deg, transparent 0 31px, rgba(104,136,161,0.07) 31px 32px);
            border: 1px solid rgba(80,112,140,0.18);
            border-radius: 26px;
            box-shadow: 0 18px 34px rgba(117,145,164,0.08);
        }
        .hero-board {
            padding: 26px 28px 24px;
            position: relative;
            overflow: hidden;
        }
        .hero-board::after {
            content: "KUMO";
            position: absolute;
            right: 20px;
            bottom: 10px;
            font-family: 'Cormorant Garamond', serif;
            font-size: 5rem;
            letter-spacing: 0.08em;
            color: rgba(49,95,153,0.06);
            pointer-events: none;
        }
        .hero-badge {
            background: rgba(49,95,153,0.09);
            color: var(--primary);
            border: 1px solid rgba(49,95,153,0.18);
            border-radius: 999px;
            font-size: 0.7rem;
            letter-spacing: 0.16em;
        }
        h1 {
            font-size: clamp(2.5rem, 5vw, 4rem);
            font-weight: 600;
            letter-spacing: 0.06em;
            line-height: 1.02;
            color: var(--primary);
            background: none;
            -webkit-text-fill-color: initial;
            margin-bottom: 12px;
        }
        .subtitle {
            max-width: 38rem;
            font-size: 0.98rem;
            line-height: 1.85;
            color: var(--sub);
        }
        .hero-mini-notes {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 18px;
        }
        .hero-chip {
            display: inline-flex;
            align-items: center;
            padding: 7px 12px;
            border-radius: 999px;
            border: 1px solid rgba(80,112,140,0.16);
            background: rgba(255,255,255,0.7);
            color: var(--primary);
            font-size: 0.78rem;
            letter-spacing: 0.04em;
        }
        .hero-notes {
            display: grid;
            gap: 16px;
        }
        .hero-note {
            padding: 20px 22px;
            position: relative;
        }
        .hero-note::before {
            content: "";
            position: absolute;
            width: 16px;
            height: 16px;
            top: 14px;
            right: 14px;
            border-radius: 4px;
            background: rgba(255,255,255,0.75);
            box-shadow: 0 0 0 1px rgba(80,112,140,0.12);
        }
        .hero-note-title {
            font-size: 1.55rem;
            color: var(--primary);
            margin-bottom: 6px;
            letter-spacing: 0.04em;
        }
        .hero-note-body {
            font-size: 0.9rem;
            line-height: 1.8;
            color: var(--sub);
        }
        .note-blue { background-color: rgba(226,238,248,0.72); }
        .note-rose { background-color: rgba(248,236,244,0.72); }
        .stats-strip {
            display: flex;
            gap: 10px;
            margin-bottom: 20px;
        }
        .stat-card {
            padding: 11px 14px;
            min-height: unset;
            align-items: center;
            gap: 10px;
            transform: none;
        }
        .stat-card:hover {
            transform: translateY(-2px) rotate(-0.35deg);
            box-shadow: 0 18px 30px rgba(117,145,164,0.12);
        }
        .stat-icon {
            font-size: 1.2rem;
            background: rgba(49,95,153,0.08);
            border: 1px solid rgba(49,95,153,0.15);
            width: 38px;
            height: 38px;
            border-radius: 12px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }
        .stat-value {
            font-family: 'Cormorant Garamond', serif;
            font-size: 2.15rem;
            color: var(--primary);
            line-height: 1;
        }
        .stat-label {
            letter-spacing: 0.08em;
            text-transform: uppercase;
            font-size: 0.72rem;
        }
        .card {
            border-radius: 26px;
            background:
                linear-gradient(180deg, rgba(255,255,255,0.9), rgba(255,255,255,0.78)),
                repeating-linear-gradient(0deg, transparent 0 33px, rgba(104,136,161,0.055) 33px 34px);
            box-shadow: 0 16px 32px rgba(117,145,164,0.08);
        }
        .controls-card {
            padding: 24px 26px;
        }
        .section-label {
            font-size: 0.72rem;
            letter-spacing: 0.18em;
            color: var(--primary);
        }
        .level-selector {
            padding: 4px;
            border-radius: 16px;
            background: rgba(228,236,242,0.75);
            border: 1px solid rgba(80,112,140,0.12);
        }
        .level-btn {
            border-radius: 13px;
            font-size: 0.88rem;
            color: var(--sub);
            font-family: 'Noto Serif TC', serif;
        }
        .level-btn.active {
            background: linear-gradient(145deg, #315f99, #6e8fb7);
            box-shadow: 0 10px 18px rgba(49,95,153,0.18);
        }
        .topic-select,
        .writing-textarea,
        .auth-input,
        .pw-input,
        .admin-search {
            border-radius: 16px;
            border-color: rgba(80,112,140,0.14);
            background: rgba(255,255,255,0.78);
        }
        .record-area {
            padding: 16px 18px;
            border: 1px dashed rgba(80,112,140,0.22);
            border-radius: 22px;
            background: rgba(242,247,249,0.68);
        }
        .record-btn {
            background: linear-gradient(145deg, #315f99, #7c9cc3);
            box-shadow: 0 10px 28px rgba(49,95,153,0.2);
        }
        .start-conv-btn,
        .writing-submit-btn,
        .listen-gen-btn,
        .listen-submit-btn,
        .pw-confirm-btn {
            border-radius: 18px;
            background: linear-gradient(145deg, #315f99, #7f9fc6);
            box-shadow: 0 14px 24px rgba(49,95,153,0.18);
        }
        .start-conv-hint,
        .record-sub,
        .empty-desc {
            color: var(--sub);
            line-height: 1.8;
        }
        .char-card,
        .turn-card,
        .listen-player-card,
        .listen-transcript-card,
        .writing-q-card,
        .writing-input-card,
        .admin-mgmt-section {
            border-radius: 24px;
            border-color: rgba(80,112,140,0.16);
            box-shadow: 0 16px 28px rgba(117,145,164,0.08);
        }
        .history {
            gap: 16px;
        }
        .turn-meta,
        .feedback-section,
        .eval-section {
            background: rgba(244,248,250,0.78);
        }
        .empty-state {
            padding: 42px 26px;
            border-radius: 26px;
            text-align: center;
        }
        .empty-icon {
            border-radius: 16px;
            background: rgba(49,95,153,0.08);
        }
        .line-btn {
            background: linear-gradient(145deg, #5ab37b, #2f9862);
            border-radius: 20px;
        }
        .read-layout {
            width: 100%;
            display: grid;
            grid-template-columns: minmax(0, 1.2fr) minmax(290px, 0.8fr);
            gap: 18px;
            position: relative;
        }
        .read-layout.locked {
            pointer-events: none;
            filter: blur(5px) saturate(0.88);
            opacity: 0.42;
            user-select: none;
        }
        .read-locked-shell {
            position: relative;
            width: 100%;
        }
        .read-lock-overlay {
            position: absolute;
            inset: 16px;
            z-index: 5;
            display: none;
            align-items: center;
            justify-content: center;
            padding: 18px;
        }
        .read-lock-overlay.open {
            display: flex;
        }
        .read-lock-card {
            width: min(460px, 100%);
            border-radius: 28px;
            background:
                linear-gradient(180deg, rgba(255,255,255,0.94), rgba(255,255,255,0.84)),
                repeating-linear-gradient(0deg, transparent 0 31px, rgba(104,136,161,0.06) 31px 32px);
            border: 1px solid rgba(80,112,140,0.18);
            box-shadow: 0 22px 40px rgba(117,145,164,0.14);
            padding: 28px 28px 24px;
            text-align: center;
        }
        .read-lock-icon {
            width: 58px;
            height: 58px;
            margin: 0 auto 14px;
            border-radius: 18px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(49,95,153,0.08);
            color: var(--primary);
            border: 1px solid rgba(49,95,153,0.14);
            font-size: 1.45rem;
        }
        .read-lock-title {
            font-family: 'Cormorant Garamond', 'Noto Serif TC', serif;
            font-size: 2rem;
            color: var(--primary);
            letter-spacing: 0.04em;
            margin-bottom: 6px;
        }
        .read-lock-desc {
            color: var(--sub);
            line-height: 1.85;
            font-size: 0.9rem;
            margin-bottom: 18px;
        }
        .read-lock-btn {
            border: none;
            border-radius: 18px;
            padding: 12px 18px;
            background: linear-gradient(145deg, #315f99, #7f9fc6);
            color: #fff;
            font-family: inherit;
            cursor: pointer;
            box-shadow: 0 14px 24px rgba(49,95,153,0.18);
        }
        .read-left,
        .read-right {
            display: flex;
            flex-direction: column;
            gap: 18px;
            min-width: 0;
        }
        .read-meta-strip {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 14px;
        }
        .read-meta-chip {
            padding: 7px 12px;
            border-radius: 999px;
            border: 1px solid rgba(80,112,140,0.16);
            background: rgba(255,255,255,0.74);
            color: var(--primary);
            font-size: 0.76rem;
        }
        .read-controls-card {
            padding: 22px 24px;
        }
        .read-level-tabs {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }
        .read-level-btn,
        .read-type-btn {
            border: 1px solid rgba(80,112,140,0.14);
            background: rgba(255,255,255,0.78);
            color: var(--sub);
            border-radius: 999px;
            padding: 9px 15px;
            font-family: inherit;
            font-size: 0.84rem;
            cursor: pointer;
            transition: all 0.18s ease;
        }
        .read-level-btn.active,
        .read-type-btn.active {
            background: linear-gradient(145deg, #315f99, #7f9fc6);
            color: #fff;
            box-shadow: 0 10px 18px rgba(49,95,153,0.16);
        }
        .read-type-tabs {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            margin-top: 12px;
        }
        .read-passage-card,
        .read-question-card,
        .read-guide-card,
        .read-progress-card {
            padding: 22px 24px;
        }
        .read-card-title {
            font-family: 'Cormorant Garamond', 'Noto Serif TC', serif;
            font-size: 1.7rem;
            color: var(--primary);
            margin-bottom: 6px;
            letter-spacing: 0.03em;
        }
        .read-card-sub {
            color: var(--sub);
            font-size: 0.84rem;
            line-height: 1.8;
            margin-bottom: 14px;
        }
        .read-passage-head {
            display: flex;
            justify-content: space-between;
            gap: 12px;
            align-items: flex-start;
            margin-bottom: 16px;
        }
        .read-passage-kicker {
            font-size: 0.72rem;
            letter-spacing: 0.18em;
            text-transform: uppercase;
            color: var(--primary);
            margin-bottom: 4px;
        }
        .read-passage-title {
            font-size: 1.32rem;
            color: var(--text);
            line-height: 1.35;
            font-weight: 600;
        }
        .read-passage-tag {
            flex-shrink: 0;
            padding: 8px 12px;
            border-radius: 14px;
            background: rgba(49,95,153,0.08);
            color: var(--primary);
            border: 1px solid rgba(49,95,153,0.14);
            font-size: 0.76rem;
        }
        .read-passage-body {
            display: grid;
            gap: 14px;
            font-size: 1rem;
            line-height: 2;
            color: #284b6a;
        }
        .read-vocab-box {
            margin-top: 18px;
            border-top: 1px dashed rgba(80,112,140,0.18);
            padding-top: 14px;
        }
        .read-vocab-grid {
            display: grid;
            grid-template-columns: repeat(2, minmax(0, 1fr));
            gap: 10px;
            margin-top: 10px;
        }
        .read-vocab-item {
            border-radius: 14px;
            background: rgba(246,249,250,0.88);
            border: 1px solid rgba(80,112,140,0.12);
            padding: 10px 12px;
        }
        .read-vocab-ja {
            color: var(--primary);
            font-weight: 600;
            margin-bottom: 2px;
        }
        .read-vocab-zh {
            color: var(--sub);
            font-size: 0.8rem;
        }
        .read-question-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .read-question-item {
            border-radius: 18px;
            border: 1px solid rgba(80,112,140,0.12);
            background: rgba(255,255,255,0.72);
            padding: 16px 16px 14px;
        }
        .read-question-head {
            display: flex;
            gap: 10px;
            align-items: flex-start;
            margin-bottom: 12px;
        }
        .read-question-num {
            width: 28px;
            height: 28px;
            border-radius: 10px;
            background: rgba(49,95,153,0.1);
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 0.8rem;
            font-weight: 700;
            flex-shrink: 0;
        }
        .read-question-text {
            font-size: 0.93rem;
            line-height: 1.8;
            color: var(--text);
        }
        .read-option-list {
            display: grid;
            gap: 8px;
        }
        .read-option {
            width: 100%;
            text-align: left;
            border: 1px solid rgba(80,112,140,0.12);
            background: rgba(248,250,251,0.9);
            border-radius: 14px;
            padding: 11px 12px;
            color: var(--text);
            font-family: inherit;
            font-size: 0.84rem;
            cursor: pointer;
            transition: all 0.18s ease;
        }
        .read-option:hover {
            border-color: rgba(49,95,153,0.22);
            transform: translateY(-1px);
        }
        .read-option.selected {
            border-color: rgba(49,95,153,0.28);
            background: rgba(49,95,153,0.08);
            color: var(--primary);
        }
        .read-option.correct {
            background: rgba(124,167,152,0.16);
            border-color: rgba(124,167,152,0.34);
            color: #436a5c;
        }
        .read-option.wrong {
            background: rgba(203,125,125,0.12);
            border-color: rgba(203,125,125,0.3);
            color: #aa6060;
        }
        .read-actions {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            margin-top: 16px;
        }
        .read-primary-btn,
        .read-secondary-btn {
            border: none;
            border-radius: 16px;
            padding: 12px 16px;
            font-family: inherit;
            cursor: pointer;
            font-size: 0.86rem;
        }
        .read-primary-btn {
            background: linear-gradient(145deg, #315f99, #7f9fc6);
            color: #fff;
            box-shadow: 0 14px 24px rgba(49,95,153,0.18);
        }
        .read-primary-btn:disabled {
            background: rgba(180,180,180,0.3);
            color: rgba(80,80,80,0.4);
            box-shadow: none;
            cursor: not-allowed;
        }
        .read-secondary-btn {
            background: rgba(255,255,255,0.82);
            color: var(--primary);
            border: 1px solid rgba(80,112,140,0.16);
        }
        .read-result-box {
            margin-top: 16px;
            padding: 16px;
            border-radius: 18px;
            background: rgba(245,249,250,0.86);
            border: 1px solid rgba(80,112,140,0.12);
            display: none;
        }
        .read-result-score {
            font-family: 'Cormorant Garamond', serif;
            font-size: 2.1rem;
            color: var(--primary);
            line-height: 1;
        }
        .read-result-sub {
            color: var(--sub);
            margin-top: 4px;
            font-size: 0.84rem;
        }
        .read-explanations {
            display: grid;
            gap: 8px;
            margin-top: 14px;
        }
        .read-explanation-item {
            border-radius: 14px;
            background: rgba(255,255,255,0.75);
            border: 1px solid rgba(80,112,140,0.1);
            overflow: hidden;
        }
        .read-explanation-toggle {
            width: 100%;
            text-align: left;
            background: none;
            border: none;
            padding: 11px 14px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-family: inherit;
            font-size: 0.84rem;
            font-weight: 600;
            color: var(--text);
            gap: 8px;
        }
        .read-explanation-toggle:hover { background: rgba(49,95,153,0.04); }
        .read-explanation-toggle .re-arrow {
            flex-shrink: 0;
            font-size: 0.7rem;
            color: var(--sub);
            transition: transform 0.2s ease;
        }
        .read-explanation-item.open .re-arrow { transform: rotate(180deg); }
        .read-explanation-body {
            display: none;
            padding: 0 14px 12px;
            line-height: 1.7;
            color: var(--text);
            font-size: 0.84rem;
        }
        .read-explanation-item.open .read-explanation-body { display: block; }
        /* AI error notice in passage area */
        .read-ai-error {
            margin: 12px 0 0;
            padding: 12px 14px;
            border-radius: 14px;
            background: rgba(255,246,230,0.9);
            border: 1px solid rgba(200,160,80,0.22);
            color: #7a5a20;
            font-size: 0.84rem;
            line-height: 1.7;
        }
        /* Passage loading skeleton */
        .read-passage-loading {
            display: flex;
            flex-direction: column;
            gap: 10px;
            padding: 8px 0;
        }
        .read-skel {
            border-radius: 8px;
            background: linear-gradient(90deg, rgba(49,95,153,0.07) 25%, rgba(49,95,153,0.13) 50%, rgba(49,95,153,0.07) 75%);
            background-size: 200% 100%;
            animation: skel-shimmer 1.4s infinite;
        }
        @keyframes skel-shimmer { to { background-position: -200% 0; } }
        @media (max-width: 520px) {
            .read-actions {
                display: grid;
                grid-template-columns: 1fr 1fr;
            }
        }
        .read-guide-list {
            display: grid;
            gap: 10px;
            margin-top: 10px;
        }
        .read-guide-item {
            padding: 12px 14px;
            border-radius: 14px;
            background: rgba(255,255,255,0.74);
            border: 1px solid rgba(80,112,140,0.1);
        }
        .read-guide-title {
            color: var(--primary);
            font-weight: 600;
            margin-bottom: 4px;
        }
        .read-guide-desc {
            color: var(--sub);
            font-size: 0.82rem;
            line-height: 1.75;
        }
        .read-progress-grid {
            display: grid;
            gap: 10px;
            margin-top: 10px;
        }
        .read-progress-item {
            display: flex;
            justify-content: space-between;
            gap: 12px;
            padding: 12px 14px;
            border-radius: 14px;
            background: rgba(255,255,255,0.76);
            border: 1px solid rgba(80,112,140,0.1);
        }
        .read-progress-label {
            color: var(--sub);
            font-size: 0.8rem;
        }
        .read-progress-value {
            color: var(--primary);
            font-weight: 700;
        }
        @media (max-width: 900px) {
            .read-layout {
                grid-template-columns: 1fr;
            }
            .read-vocab-grid {
                grid-template-columns: 1fr;
            }
            .page {
                padding: 24px 16px 78px;
            }
        }

        /* ── UI polish overrides: tighter motion + cleaner alignment ── */
        body,
        .sidebar,
        .card,
        .sb-item,
        .topic-select,
        .read-option,
        .read-level-btn,
        .read-type-btn {
            transition-duration: 0.16s !important;
        }
        .page > *,
        .page-entering > *,
        .turn-card,
        .scene-card,
        .char-card,
        .listen-context-card,
        .listen-result-card,
        .writing-result-card,
        .wq-loading,
        .read-question-item {
            animation-duration: 0.18s !important;
        }
        .eval-score-hero,
        .listen-result-score,
        .listen-score-big {
            animation-duration: 0.22s !important;
        }
        .eval-bar-fill,
        .wr-score-fill {
            transition-duration: 0.22s !important;
        }
        .record-btn:not(.recording):not(.processing):not(.error),
        .listen-play-btn:not(.playing),
        .listen-shadow-rec-btn,
        .live-dot {
            animation-duration: 1.4s !important;
        }
        .record-btn.recording,
        .listen-shadow-rec-btn.recording {
            animation-duration: 0.85s !important;
        }
        .hero-notes {
            align-content: stretch;
        }
        .hero-note {
            min-height: 188px;
            display: flex;
            flex-direction: column;
            justify-content: flex-start;
        }
        .stat-body {
            display: flex;
            flex-direction: column;
        }
        .scene-header,
        .char-card {
            align-items: flex-start;
        }
        .scene-emoji-wrap,
        .char-card-emoji,
        .scene-display-emoji {
            width: 72px;
            height: 72px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            text-align: center;
        }
        .sb-avatar,
        .admin-avatar-sm {
            flex-shrink: 0;
        }
        .read-lock-card {
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .read-question-item {
            min-height: 164px;
        }
        .read-vocab-item {
            min-height: 74px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .read-guide-item {
            min-height: 92px;
        }
        .read-progress-item {
            align-items: center;
        }
        .read-lock-icon,
        .stat-icon {
            flex-shrink: 0;
        }
        @media (max-width: 900px) {
            .hero-note,
            .stat-card,
            .read-question-item,
            .read-guide-item,
            .read-vocab-item {
                min-height: unset;
            }
            .scene-emoji-wrap,
            .char-card-emoji,
            .scene-display-emoji {
                width: 56px;
                height: 56px;
            }
        }

        .practice-fab {
            position: fixed;
            right: 24px;
            bottom: 104px;
            z-index: 1200;
            display: flex;
            flex-direction: column;
            align-items: flex-end;
            gap: 12px;
        }
        .practice-fab-panel {
            width: min(360px, calc(100vw - 28px));
            max-height: min(70vh, 620px);
            overflow: hidden;
            border-radius: 24px;
            border: 1px solid rgba(80,112,140,0.16);
            background: rgba(255,255,255,0.92);
            box-shadow: 0 24px 54px rgba(74, 103, 137, 0.18);
            backdrop-filter: blur(18px);
            display: none;
        }
        .practice-fab.open .practice-fab-panel {
            display: block;
            animation: fabPanelIn 0.18s ease both;
        }
        @keyframes fabPanelIn {
            from { opacity: 0; transform: translateY(10px) scale(0.98); }
            to { opacity: 1; transform: translateY(0) scale(1); }
        }
        .practice-fab-btn {
            border: none;
            border-radius: 999px;
            background: linear-gradient(145deg, #315f99, #90abc9);
            color: #fff;
            padding: 13px 18px;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            box-shadow: 0 18px 38px rgba(49,95,153,0.28);
            cursor: pointer;
            font-family: inherit;
            font-size: 0.88rem;
        }
        .practice-fab-btn strong {
            font-size: 0.96rem;
            letter-spacing: 0.02em;
        }
        .practice-fab-dot {
            width: 10px;
            height: 10px;
            border-radius: 999px;
            background: #fdf6d3;
            box-shadow: 0 0 0 5px rgba(255,255,255,0.14);
            flex-shrink: 0;
        }
        .practice-panel-head {
            padding: 18px 18px 14px;
            border-bottom: 1px solid rgba(80,112,140,0.08);
            background: linear-gradient(180deg, rgba(247,250,252,0.96), rgba(255,255,255,0.72));
        }
        .practice-panel-title {
            font-family: 'Cormorant Garamond', 'Noto Serif TC', serif;
            font-size: 1.7rem;
            color: var(--primary);
            line-height: 1;
            margin-bottom: 6px;
        }
        .practice-panel-sub {
            font-size: 0.78rem;
            color: var(--sub);
            line-height: 1.7;
        }
        .practice-summary-row {
            display: grid;
            grid-template-columns: repeat(3, minmax(0, 1fr));
            gap: 10px;
            margin-top: 14px;
        }
        .practice-summary-card {
            border-radius: 16px;
            background: rgba(246,249,250,0.86);
            border: 1px solid rgba(80,112,140,0.1);
            padding: 12px;
        }
        .practice-summary-label {
            font-size: 0.72rem;
            color: var(--sub);
            margin-bottom: 4px;
        }
        .practice-summary-value {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--primary);
        }
        .practice-tabs {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            padding: 14px 18px 10px;
        }
        .practice-tab {
            border: 1px solid rgba(80,112,140,0.12);
            background: rgba(255,255,255,0.84);
            color: var(--sub);
            border-radius: 999px;
            padding: 8px 12px;
            font-size: 0.78rem;
            font-family: inherit;
            cursor: pointer;
        }
        .practice-tab.active {
            background: linear-gradient(145deg, #315f99, #7f9fc6);
            color: #fff;
            box-shadow: 0 10px 18px rgba(49,95,153,0.16);
        }
        .practice-list {
            padding: 0 18px 18px;
            display: flex;
            flex-direction: column;
            gap: 10px;
            overflow: auto;
            max-height: 360px;
        }
        .practice-entry {
            border-radius: 18px;
            background: rgba(250,251,252,0.86);
            border: 1px solid rgba(80,112,140,0.10);
            padding: 13px 14px;
        }
        .practice-entry-top {
            display: flex;
            justify-content: space-between;
            gap: 12px;
            align-items: flex-start;
        }
        .practice-entry-type {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--primary);
            font-size: 0.76rem;
            font-weight: 700;
        }
        .practice-entry-time {
            font-size: 0.72rem;
            color: var(--sub);
            flex-shrink: 0;
        }
        .practice-entry-title {
            margin-top: 7px;
            font-size: 0.85rem;
            color: var(--text);
            line-height: 1.65;
        }
        .practice-entry-meta {
            margin-top: 8px;
            display: flex;
            justify-content: space-between;
            gap: 12px;
            align-items: center;
        }
        .practice-entry-level {
            font-size: 0.74rem;
            color: var(--sub);
        }
        .practice-entry-score {
            font-size: 0.82rem;
            font-weight: 700;
            color: var(--primary);
            background: rgba(49,95,153,0.08);
            border: 1px solid rgba(49,95,153,0.12);
            padding: 5px 10px;
            border-radius: 999px;
        }
        .practice-empty {
            padding: 18px;
            text-align: center;
            color: var(--sub);
            font-size: 0.82rem;
            line-height: 1.8;
        }
        .practice-section {
            padding: 0 18px 14px;
        }
        .practice-section-title {
            font-size: 0.76rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: 0.04em;
            margin-bottom: 10px;
        }
        .practice-weakness-grid {
            display: grid;
            gap: 10px;
        }
        .practice-weakness-card {
            border-radius: 16px;
            background: rgba(246,249,250,0.86);
            border: 1px solid rgba(80,112,140,0.1);
            padding: 12px 13px;
        }
        .practice-weakness-top {
            display: flex;
            justify-content: space-between;
            gap: 10px;
            align-items: center;
            margin-bottom: 6px;
        }
        .practice-weakness-label {
            font-size: 0.82rem;
            font-weight: 700;
            color: var(--text);
        }
        .practice-weakness-count {
            font-size: 0.74rem;
            color: #b45309;
            background: rgba(245, 158, 11, 0.12);
            border: 1px solid rgba(245, 158, 11, 0.16);
            border-radius: 999px;
            padding: 4px 8px;
        }
        .practice-weakness-desc {
            font-size: 0.76rem;
            color: var(--sub);
            line-height: 1.7;
        }
        .practice-mistake-list {
            padding: 0 18px 14px;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .practice-mistake-item {
            border-radius: 18px;
            background: rgba(255,249,244,0.88);
            border: 1px solid rgba(226,160,67,0.14);
            padding: 13px 14px;
        }
        .practice-mistake-head {
            display: flex;
            justify-content: space-between;
            gap: 10px;
            align-items: flex-start;
            margin-bottom: 6px;
        }
        .practice-mistake-skill {
            font-size: 0.74rem;
            font-weight: 700;
            color: #9a6700;
        }
        .practice-mistake-time {
            font-size: 0.7rem;
            color: var(--sub);
        }
        .practice-mistake-title {
            font-size: 0.84rem;
            font-weight: 700;
            color: var(--text);
            line-height: 1.55;
        }
        .practice-mistake-detail,
        .practice-mistake-fix {
            font-size: 0.77rem;
            color: var(--sub);
            line-height: 1.7;
            margin-top: 4px;
        }
        .practice-mistake-fix {
            color: var(--primary);
        }
        .dashboard-shell {
            width: 100%;
            display: grid;
            gap: 16px;
        }
        .dashboard-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 16px;
            width: 100%;
        }
        .dashboard-card {
            padding: 22px 24px;
        }
        .dashboard-title {
            font-family: 'Cormorant Garamond', 'Noto Serif TC', serif;
            font-size: 1.7rem;
            color: var(--primary);
            margin-bottom: 6px;
        }
        .dashboard-sub {
            color: var(--sub);
            font-size: 0.82rem;
            line-height: 1.8;
            margin-bottom: 14px;
        }
        .dashboard-mini-grid {
            display: grid;
            grid-template-columns: repeat(2, minmax(0, 1fr));
            gap: 10px;
        }
        .dashboard-mini-card {
            border-radius: 16px;
            background: rgba(246,249,250,0.88);
            border: 1px solid rgba(80,112,140,0.1);
            padding: 13px 14px;
        }
        .dashboard-mini-label {
            font-size: 0.72rem;
            color: var(--sub);
            margin-bottom: 5px;
        }
        .dashboard-mini-value {
            font-size: 1.22rem;
            font-weight: 700;
            color: var(--primary);
        }
        .dashboard-skill-row,
        .dashboard-mistake-row {
            display: flex;
            justify-content: space-between;
            gap: 12px;
            padding: 11px 12px;
            border-radius: 14px;
            background: rgba(255,255,255,0.76);
            border: 1px solid rgba(80,112,140,0.1);
        }
        .dashboard-stack {
            display: grid;
            gap: 10px;
        }
        .dashboard-skill-name,
        .dashboard-mistake-name {
            font-size: 0.82rem;
            font-weight: 700;
            color: var(--text);
        }
        .dashboard-skill-meta,
        .dashboard-mistake-meta {
            font-size: 0.75rem;
            color: var(--sub);
            margin-top: 4px;
            line-height: 1.65;
        }
        .dashboard-skill-value,
        .dashboard-mistake-value {
            font-size: 0.78rem;
            font-weight: 700;
            color: var(--primary);
            white-space: nowrap;
        }
        .dashboard-ai-card {
            background: linear-gradient(180deg, rgba(255,255,255,0.94), rgba(240,246,250,0.92));
        }
        .dashboard-ai-badge {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 7px 12px;
            border-radius: 999px;
            background: rgba(49,95,153,0.08);
            color: var(--primary);
            border: 1px solid rgba(49,95,153,0.12);
            font-size: 0.74rem;
            margin-bottom: 12px;
        }
        .dashboard-ai-status {
            font-size: 1.02rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 8px;
        }
        .dashboard-ai-summary {
            font-size: 0.83rem;
            color: var(--sub);
            line-height: 1.82;
            margin-bottom: 14px;
        }
        .dashboard-ai-list {
            display: grid;
            gap: 10px;
            margin-bottom: 14px;
        }
        .dashboard-ai-chip {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 10px;
            border-radius: 999px;
            background: rgba(255,255,255,0.84);
            border: 1px solid rgba(80,112,140,0.1);
            font-size: 0.75rem;
            color: var(--text);
            margin-right: 8px;
            margin-bottom: 8px;
        }
        .dashboard-next-step {
            border-radius: 16px;
            padding: 13px 14px;
            background: rgba(236,243,250,0.82);
            border: 1px solid rgba(49,95,153,0.12);
            color: var(--text);
            line-height: 1.75;
            font-size: 0.82rem;
        }
        .dashboard-empty {
            padding: 16px;
            border-radius: 16px;
            background: rgba(248,250,251,0.9);
            border: 1px solid rgba(80,112,140,0.1);
            color: var(--sub);
            line-height: 1.8;
            font-size: 0.8rem;
        }
        @media (max-width: 900px) {
            .practice-fab {
                right: 14px;
                bottom: calc(130px + env(safe-area-inset-bottom));
            }
            .practice-fab-btn {
                padding: 12px 15px;
            }
            .practice-summary-row {
                grid-template-columns: 1fr;
            }
            .dashboard-grid,
            .dashboard-mini-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ── Weakness drill modal ── */
        .drill-overlay {
            position: fixed; inset: 0;
            background: rgba(0,0,0,0.38);
            display: flex; align-items: center; justify-content: center;
            z-index: 9900; padding: 16px;
        }
        .drill-modal {
            background: var(--card);
            border-radius: 22px;
            border: 1px solid var(--card-border);
            padding: 26px 24px;
            max-width: 480px; width: 100%;
            box-shadow: 0 20px 60px rgba(0,0,0,0.18);
            display: grid; gap: 14px;
        }
        .drill-modal-badge {
            display: inline-flex; align-items: center; gap: 7px;
            padding: 6px 12px; border-radius: 999px;
            background: var(--primary-dim); color: var(--primary);
            border: 1px solid rgba(168,200,232,0.3);
            font-size: 0.73rem; font-weight: 600; width: fit-content;
        }
        .drill-modal-label {
            font-size: 1rem; font-weight: 700; color: var(--text);
        }
        .drill-modal-question {
            font-size: 0.9rem; line-height: 1.85;
            color: var(--text);
            border-radius: 14px; padding: 13px 14px;
            background: rgba(248,250,251,0.9);
            border: 1px solid rgba(80,112,140,0.1);
        }
        .drill-modal-hint {
            border-radius: 14px; padding: 11px 14px;
            background: rgba(236,243,250,0.7);
            border: 1px solid rgba(49,95,153,0.1);
            font-size: 0.81rem; color: var(--sub); line-height: 1.75;
        }
        .drill-modal-input {
            width: 100%; box-sizing: border-box;
            padding: 11px 14px; border-radius: 14px;
            border: 1.5px solid var(--muted-border);
            background: var(--input-bg);
            font-size: 0.88rem; color: var(--text);
            outline: none; resize: vertical; font-family: inherit;
        }
        .drill-modal-input:focus { border-color: var(--primary); }
        .drill-modal-answer {
            border-radius: 14px; padding: 13px 14px;
            background: rgba(168,232,200,0.15);
            border: 1px solid rgba(168,232,200,0.4);
            font-size: 0.84rem; line-height: 1.75; color: var(--text);
        }
        .drill-modal-explanation {
            font-size: 0.79rem; color: var(--sub); line-height: 1.8; margin-top: 8px;
        }
        .drill-modal-actions {
            display: flex; gap: 10px; justify-content: flex-end;
        }
        .drill-btn-action {
            padding: 10px 18px; border-radius: 12px; border: none;
            font-size: 0.82rem; font-weight: 600; cursor: pointer;
            transition: opacity 0.15s; font-family: inherit;
        }
        .drill-btn-action:hover { opacity: 0.82; }
        .drill-btn-primary { background: var(--primary); color: #fff; }
        .drill-btn-ghost {
            background: transparent; color: var(--sub);
            border: 1px solid var(--muted-border);
        }
        .drill-btn-hint {
            padding: 7px 14px; border-radius: 10px;
            border: 1px solid var(--muted-border);
            background: transparent; cursor: pointer;
            color: var(--sub); font-size: 0.78rem; font-family: inherit;
        }
        .drill-weakness-btn {
            font-size: 0.71rem; font-weight: 600;
            padding: 5px 11px; border-radius: 9px;
            background: var(--primary-dim); color: var(--primary);
            border: 1px solid rgba(168,200,232,0.3);
            cursor: pointer; white-space: nowrap; font-family: inherit;
        }
        .drill-weakness-btn:hover { background: var(--primary-glow); }

        /* ── Growth trend ── */
        .trend-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(58px, 1fr));
            gap: 8px;
        }
        .trend-day {
            border-radius: 14px; padding: 10px 6px;
            background: rgba(248,250,251,0.9);
            border: 1px solid rgba(80,112,140,0.1);
            text-align: center;
        }
        .trend-day-date { font-size: 0.67rem; color: var(--sub); margin-bottom: 4px; }
        .trend-day-score { font-size: 1.02rem; font-weight: 700; color: var(--primary); }
        .trend-day-title { font-size: 0.63rem; color: var(--sub); margin-top: 4px; line-height: 1.4; }


/* ── Zh Translation Toggle ── */
.zh-toggle-wrap{display:flex;align-items:center;gap:8px;margin-top:8px}
.zh-switch{position:relative;width:36px;height:20px;flex-shrink:0}
.zh-switch input{opacity:0;width:0;height:0}
.zh-switch .zh-slider{position:absolute;inset:0;background:var(--muted-border,#ccc);border-radius:20px;cursor:pointer;transition:background 0.2s}
.zh-switch .zh-slider::before{content:'';position:absolute;width:16px;height:16px;left:2px;top:2px;background:#fff;border-radius:50%;transition:transform 0.2s}
.zh-switch input:checked+.zh-slider{background:var(--primary,#6b9dd6)}
.zh-switch input:checked+.zh-slider::before{transform:translateX(16px)}
.zh-toggle-label{font-size:0.78rem;color:var(--sub);cursor:pointer;user-select:none}
.zh-translation{color:var(--sub,#888);font-size:0.85em;margin-top:4px;line-height:1.5;opacity:0.85}

/* ── Records Page ── */
.records-stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:20px}
@media(max-width:640px){.records-stats-grid{grid-template-columns:repeat(2,1fr)}}
.records-stat-card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:18px;text-align:center}
.records-stat-accent{border-color:rgba(168,200,232,0.4);background:rgba(168,200,232,0.07)}
.records-stat-value{font-size:1.75rem;font-weight:800;color:var(--text);line-height:1;margin-bottom:6px}
.records-stat-label{font-size:0.74rem;color:var(--sub)}
.records-chart-title{font-size:0.88rem;font-weight:600;color:var(--text);margin-bottom:14px;display:block}
    #app-loading {
        position: fixed; inset: 0; z-index: 9999;
        display: flex; align-items: center; justify-content: center;
        background: var(--bg, #f8f5f0);
        flex-direction: column; gap: 16px;
        transition: opacity 0.38s ease;
    }
    #app-loading .al-logo {
        font-size: 2.4rem; font-weight: 800; letter-spacing: 0.04em;
        color: var(--accent, #5b7fa6);
    }
    #app-loading .al-spinner {
        width: 28px; height: 28px; border-radius: 50%;
        border: 3px solid rgba(91,127,166,0.2);
        border-top-color: var(--accent, #5b7fa6);
        animation: al-spin 0.8s linear infinite;
    }
    @keyframes al-spin { to { transform: rotate(360deg); } }

    /* ── Auth/page transition helpers ── */
    /* Button loading spinner */
    .auth-submit-btn { position: relative; overflow: hidden; }
    .auth-google-btn { position: relative; overflow: hidden; }
    .auth-submit-btn.btn-loading,
    .auth-google-btn.btn-loading { color: transparent !important; pointer-events: none; }
    .auth-submit-btn.btn-loading::after,
    .auth-google-btn.btn-loading::after {
        content: '';
        position: absolute; top: 50%; left: 50%;
        width: 18px; height: 18px;
        transform: translate(-50%, -50%);
        border: 2.5px solid rgba(255,255,255,0.3);
        border-top-color: #fff;
        border-radius: 50%;
        animation: al-spin 0.7s linear infinite;
    }
    .auth-google-btn.btn-loading::after {
        border-color: rgba(91,127,166,0.25);
        border-top-color: var(--primary, #5b7fa6);
    }
    /* Page leave fade is handled inline in switchPage JS */

    /* ── Onboarding modal ── */
    .ob-overlay {
        position: fixed; inset: 0; z-index: 1800;
        background: rgba(0,0,0,0.55);
        backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
        display: flex; align-items: center; justify-content: center;
        padding: 20px;
        opacity: 0; pointer-events: none;
        transition: opacity 0.3s ease;
    }
    .ob-overlay.open { opacity: 1; pointer-events: auto; }
    .ob-card {
        width: 100%; max-width: 440px;
        background: var(--card);
        border: 1px solid var(--card-border);
        border-radius: 28px;
        padding: 36px 32px 28px;
        box-shadow: 0 24px 64px rgba(0,0,0,0.22);
        display: flex; flex-direction: column; align-items: center; gap: 20px;
        position: relative;
        transform: translateY(20px) scale(0.97);
        transition: transform 0.3s ease;
    }
    .ob-overlay.open .ob-card { transform: translateY(0) scale(1); }
    .ob-skip {
        position: absolute; top: 16px; right: 16px;
        background: none; border: none; cursor: pointer;
        color: var(--sub); font-size: 0.8rem; font-family: inherit;
        padding: 6px 10px; border-radius: 8px;
        transition: background 0.15s;
    }
    .ob-skip:hover { background: var(--muted); }
    .ob-emoji { font-size: 3.6rem; line-height: 1; }
    .ob-title { font-size: 1.2rem; font-weight: 700; color: var(--text); text-align: center; }
    .ob-desc  { font-size: 0.9rem; color: var(--sub); text-align: center; line-height: 1.65; }
    .ob-dots  { display: flex; gap: 7px; align-items: center; }
    .ob-dot   {
        width: 7px; height: 7px; border-radius: 50%;
        background: var(--muted-border); transition: all 0.2s;
    }
    .ob-dot.active { width: 20px; border-radius: 4px; background: var(--primary); }
    .ob-nav   { display: flex; gap: 10px; width: 100%; align-items: center; justify-content: center; margin-top: 4px; }
    .ob-btn {
        flex: 1; padding: 11px 0;
        background: var(--primary); color: #fff;
        border: none; border-radius: 12px;
        font-family: inherit; font-size: 0.92rem; font-weight: 600;
        cursor: pointer; transition: opacity 0.18s;
        min-height: 44px;
    }
    .ob-btn:hover { opacity: 0.88; }
    .ob-btn.secondary {
        background: var(--muted); color: var(--text);
    }
    @media (max-width: 767px) {
        .ob-card { padding: 28px 20px 22px; }
        .ob-emoji { font-size: 3rem; }
        .ob-title { font-size: 1.05rem; }
    }

    /* ── Legal modals (privacy / terms) ── */
    .legal-overlay {
        position: fixed; inset: 0; z-index: 1700;
        background: rgba(0,0,0,0.45);
        backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
        display: flex; align-items: center; justify-content: center;
        padding: 20px;
        opacity: 0; pointer-events: none;
        transition: opacity 0.22s ease;
    }
    .legal-overlay.open { opacity: 1; pointer-events: auto; }
    .legal-modal {
        width: 100%; max-width: 560px;
        max-height: 80vh;
        background: var(--card);
        border: 1px solid var(--card-border);
        border-radius: 22px;
        box-shadow: 0 20px 60px rgba(0,0,0,0.22);
        display: flex; flex-direction: column;
        transform: translateY(16px) scale(0.97);
        transition: transform 0.22s ease;
        overflow: hidden;
    }
    .legal-overlay.open .legal-modal { transform: translateY(0) scale(1); }
    .legal-modal-head {
        display: flex; align-items: center; justify-content: space-between;
        padding: 20px 24px 16px;
        border-bottom: 1px solid var(--card-border);
        flex-shrink: 0;
    }
    .legal-modal-title {
        font-size: 1rem; font-weight: 700; color: var(--text);
    }
    .legal-modal-close {
        width: 32px; height: 32px; border-radius: 8px;
        border: none; background: var(--muted); color: var(--text);
        cursor: pointer; font-size: 1rem; line-height: 1;
        display: flex; align-items: center; justify-content: center;
        transition: background 0.15s;
    }
    .legal-modal-close:hover { background: var(--muted-border); }
    .legal-modal-body {
        padding: 20px 24px;
        overflow-y: auto;
        font-size: 0.88rem; color: var(--sub); line-height: 1.8;
        display: flex; flex-direction: column; gap: 16px;
    }
    .legal-modal-body h3 {
        font-size: 0.92rem; font-weight: 700; color: var(--text); margin-bottom: 2px;
    }
    .legal-modal-body p { margin: 0; }

    /* ── Plan management in student detail ── */
    .plan-mgmt-section {
        background: linear-gradient(135deg,rgba(168,200,232,0.08),rgba(196,181,232,0.08));
        border: 1px solid rgba(168,200,232,0.28);
        border-radius: 14px; padding: 16px; margin-bottom: 14px;
        display: flex; flex-direction: column; gap: 12px;
    }
    .plan-mgmt-title { font-size: 0.82rem; font-weight: 700; color: var(--text); }
    .plan-tag {
        display: inline-flex; align-items: center; gap: 4px;
        font-size: 0.72rem; font-weight: 700; padding: 3px 9px;
        border-radius: 20px; letter-spacing: 0.04em;
    }
    .plan-tag.active  { background: rgba(168,200,232,0.22); color: #3A6A9A; border: 1px solid rgba(168,200,232,0.4); }
    .plan-tag.free    { background: rgba(168,200,232,0.1);  color: var(--sub); border: 1px solid var(--muted-border); }
    .plan-tag.expired { background: rgba(244,168,168,0.18); color: #C05050; border: 1px solid rgba(244,168,168,0.4); }
    .plan-tag.warning { background: rgba(255,200,80,0.18);  color: #9A7020; border: 1px solid rgba(255,200,80,0.4); }
    .plan-mgmt-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
    .plan-mgmt-row label { font-size: 0.82rem; color: var(--sub); display: flex; align-items: center; gap: 6px; }
    .plan-mgmt-row input[type="date"] {
        padding: 6px 10px; border-radius: 8px; border: 1px solid var(--card-border);
        background: var(--input-bg); color: var(--text); font-size: 0.82rem; font-family: inherit;
        min-height: 36px;
    }
    .plan-quick-btns { display: flex; gap: 6px; flex-wrap: wrap; }
    .plan-quick-btn {
        padding: 6px 12px; border-radius: 8px; border: 1px solid var(--card-border);
        background: var(--muted); color: var(--text); font-size: 0.78rem; font-family: inherit;
        cursor: pointer; font-weight: 600; min-height: 34px; transition: background 0.15s;
    }
    .plan-quick-btn:hover { background: var(--primary-dim); }
    .plan-quick-btn.danger { border-color: rgba(244,168,168,0.4); color: #C05050; }
    .plan-quick-btn.danger:hover { background: rgba(244,168,168,0.15); }
    .plan-save-btn {
        width: 100%; padding: 9px; border-radius: 10px;
        background: var(--primary); color: #fff; border: none;
        font-family: inherit; font-size: 0.88rem; font-weight: 600;
        cursor: pointer; min-height: 40px; transition: opacity 0.18s;
    }
    .plan-save-btn:hover { opacity: 0.88; }

    /* Sidebar legal links */
    .sb-legal {
        display: flex; gap: 8px; padding: 0 12px 10px;
        flex-wrap: wrap;
    }
    .sb-legal a {
        font-size: 0.7rem; color: var(--sub); text-decoration: none;
        opacity: 0.7; transition: opacity 0.15s; cursor: pointer;
        background: none; border: none; font-family: inherit;
        padding: 2px 0;
    }
    .sb-legal a:hover { opacity: 1; text-decoration: underline; }
    @media (max-width: 767px) { .sb-legal { display: none; } }
    @media (min-width: 768px) and (max-width: 1024px) { .sb-legal { display: none; } }

    /* ── LINE browser overlay ── */
    #line-browser-overlay {
        position: fixed; inset: 0; z-index: 99999;
        background: linear-gradient(160deg, #e8f4f8 0%, #d4ecf5 100%);
        display: flex; flex-direction: column; align-items: center; justify-content: center;
        padding: 32px 24px; text-align: center; gap: 16px;
    }
    .dark #line-browser-overlay {
        background: linear-gradient(160deg, #1a2c35 0%, #152530 100%);
    }
    #line-browser-overlay img { width: 120px; margin-bottom: 4px; }
    .line-overlay-title {
        font-size: 1.25rem; font-weight: 800; color: #1a6e8a; letter-spacing: -0.3px;
    }
    .dark .line-overlay-title { color: #5BC4E5; }
    .line-overlay-desc {
        font-size: 0.88rem; color: #446a7a; line-height: 1.6; max-width: 320px;
    }
    .dark .line-overlay-desc { color: #8ab8c8; }
    .line-overlay-hint {
        font-size: 0.78rem; color: #5594a8; background: rgba(91,196,229,0.12);
        border-radius: 10px; padding: 10px 16px; max-width: 320px; line-height: 1.6;
    }
    .dark .line-overlay-hint { background: rgba(91,196,229,0.08); }
    .line-overlay-copy-btn {
        padding: 12px 28px; border-radius: 12px; border: none; cursor: pointer;
        background: linear-gradient(135deg, #4BBFDE, #2A9DBF);
        color: #fff; font-size: 0.95rem; font-weight: 700; letter-spacing: 0.3px;
        box-shadow: 0 4px 14px rgba(75,191,222,0.35);
    }
    .line-overlay-copy-btn:active { opacity: 0.85; }

    /* ── WebView banner ── */
    #webview-banner {
        display: none;
        background: #FF8C00; color: #fff;
        padding: 10px 16px; border-radius: 10px;
        font-size: 0.82rem; line-height: 1.5; text-align: center;
        margin-bottom: 8px; gap: 8px;
        flex-direction: column; align-items: center;
    }
    #webview-banner.visible { display: flex; }
    #webview-banner-copy {
        padding: 5px 16px; border-radius: 8px; border: 1.5px solid rgba(255,255,255,0.7);
        background: transparent; color: #fff; font-size: 0.78rem; font-weight: 600; cursor: pointer;
    }