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

:root {
    --primary: #f5c518;
    --primary-dark: #d4a80e;
    --primary-glow: rgba(245, 197, 24, 0.10);
    --primary-subtle: rgba(245, 197, 24, 0.05);
    --secondary: #f5c518;
    --success: #34d399;
    --error: #f87171;
    --warning: #fbbf24;

    --bg-body: #050505;
    --bg-card: #0e0e0e;
    --bg-card-hover: #151515;
    --bg-input: #080808;
    --bg-choice: #0b0b0b;
    --bg-elevated: #121212;

    --text: #e5e5e5;
    --text-dim: #a3a3a3;
    --text-muted: #5c5c5c;

    --border: #1a1a1a;
    --border-subtle: #141414;
    --border-focus: #f5c518;
    --radius: 8px;
    --radius-lg: 12px;

    --shadow: 0 1px 3px rgba(0,0,0,0.5), 0 1px 2px rgba(0,0,0,0.3);
    --shadow-lg: 0 4px 20px rgba(0,0,0,0.6);
    --shadow-gold: 0 0 20px rgba(245,197,24,0.06);

    --fast: 0.12s ease;
    --normal: 0.22s ease;

    --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', monospace;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-body);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    /* Subtle noise texture */
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.015'/%3E%3C/svg%3E");
}

/* Layout */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 1.5rem 1rem;
    width: 100%;
    overflow-x: hidden;
}

.app-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.sidebar {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

@media (min-width: 901px) {
    .app-layout {
        grid-template-columns: 1fr 280px;
        gap: 1.25rem;
        align-items: start;
    }
    .sidebar {
        position: sticky;
        top: 1.5rem;
        max-height: var(--sidebar-max-h, auto);
        overflow: hidden;
    }
}

@media (max-width: 900px) {
    .container {
        max-width: 100%;
        padding: 1rem 0.75rem;
    }
    .app-layout {
        grid-template-columns: 1fr;
    }
}

/* Header */
header {
    text-align: left;
    margin-bottom: 1rem;
    position: relative;
}

.header-logo {
    width: 124px;
    height: 124px;
    border-radius: var(--radius-lg);
    margin-bottom: 0.75rem;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    display: block;
}

header h1 {
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--text);
    margin-bottom: 0.3rem;
}
header h1 span, header h1 em { color: var(--primary); font-style: normal; }

header p {
    font-size: 0.8rem;
    color: var(--text-muted);
    letter-spacing: 0.01em;
}

header a { color: var(--primary); font-size: 0.8rem; text-decoration: none; margin-top: 0.4rem; display: inline-block; opacity: 0.7; transition: opacity var(--fast); }
header a:hover { opacity: 1; }

/* Sections */
.section {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--border);
    margin-bottom: 1rem;
    position: relative;
    overflow: hidden;
}
/* Gold top accent line on sections */
.section::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-glow), rgba(245,197,24,0.2), var(--primary-glow), transparent);
}

.hidden { display: none; }

/* Form */
.input-group { margin-bottom: 1.25rem; }

.input-group label, .control-group label {
    display: block;
    margin-bottom: 0.4rem;
    font-weight: 600;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.input-group input, .control-group select {
    width: 100%;
    padding: 0.65rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.85rem;
    font-family: inherit;
    background: var(--bg-input);
    color: var(--text);
    outline: none;
    transition: border-color var(--fast), box-shadow var(--fast);
}
.input-group input:focus, .control-group select:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--primary-glow), var(--shadow-gold);
}
.input-group input::placeholder { color: var(--text-muted); }

.controls { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 1.25rem; }

.control-group select {
    cursor: pointer; appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%235c5c5c' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.6rem center; background-repeat: no-repeat; background-size: 1rem; padding-right: 2rem;
}

.help-text { display: block; font-size: 0.7rem; color: var(--text-muted); margin-top: 0.3rem; }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
    padding: 0.55rem 1.2rem; border: none; border-radius: var(--radius);
    font-size: 0.82rem; font-weight: 600; font-family: inherit;
    cursor: pointer; transition: all var(--fast); text-decoration: none;
    position: relative; overflow: hidden;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.3; cursor: not-allowed; transform: none; }

.btn-primary {
    background: var(--primary-dark); color: #000; font-weight: 700;
}
.btn-primary:hover { background: var(--primary); box-shadow: var(--shadow-gold); }

.btn-secondary {
    background: var(--bg-elevated); color: var(--text-dim);
    border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: rgba(245,197,24,0.3); color: var(--text); }

.btn-icon { display: inline-block; }

/* Loading */
.loading { text-align: center; padding: 2.5rem 1rem; display: flex; flex-direction: column; align-items: center; gap: 1rem; }

.spinner {
    width: 32px; height: 32px;
    border: 2px solid var(--border);
    border-top: 2px solid var(--primary);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.loading h2 { font-size: 1rem; color: var(--text); font-weight: 600; }
.loading p { color: var(--text-muted); font-size: 0.8rem; }

.loading-steps { display: flex; flex-direction: column; gap: 0.35rem; margin-top: 0.5rem; width: 100%; max-width: 260px; }

.step {
    display: flex; align-items: center; gap: 0.5rem;
    padding: 0.35rem 0.6rem; font-size: 0.75rem;
    color: var(--text-muted); border-radius: var(--radius);
    transition: all var(--normal);
}
.step::before { content: ''; width: 5px; height: 5px; border-radius: 50%; background: var(--text-muted); flex-shrink: 0; transition: all var(--normal); }
.step.active { color: var(--primary); background: var(--primary-subtle); }
.step.active::before { background: var(--primary); box-shadow: 0 0 6px rgba(245,197,24,0.4); }

/* Progress Bar */
.progress-bar {
    background: var(--border);
    border-radius: 4px;
    height: 4px;
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
}
.progress-fill {
    background: var(--primary);
    height: 100%;
    border-radius: 4px;
    transition: width 0.4s ease;
    box-shadow: 0 0 8px rgba(245,197,24,0.3);
}
.progress-text {
    position: absolute;
    top: -1.5rem; right: 0;
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.7rem;
    font-family: var(--font-mono);
    letter-spacing: 0.02em;
}

/* Flashcard */
.flashcard {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1rem;
    min-height: 260px;
    position: relative;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}
/* Subtle left gold accent */
.flashcard::after {
    content: '';
    position: absolute;
    top: 1rem; bottom: 1rem; left: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary), transparent);
    border-radius: 1px;
    opacity: 0.4;
}

.card-content { }
.question-side, .answer-side { transition: opacity 0.3s ease, transform 0.3s ease; }
.answer-side { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--border); }

.card-content h3 {
    color: var(--primary);
    margin-bottom: 0.6rem;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}
.card-content h3::before { content: none; }

.card-content p {
    font-size: 0.9rem;
    line-height: 1.65;
    margin-bottom: 1rem;
    color: var(--text);
}

/* Choices */
.choices-container { display: grid; gap: 0.4rem; margin-top: 1rem; }

.choice {
    display: flex; align-items: flex-start;
    padding: 0.65rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--fast);
    background: var(--bg-body);
    position: relative;
}
.choice:hover { border-color: rgba(245,197,24,0.3); background: var(--primary-subtle); }
.choice.selected { border-color: var(--primary); background: var(--primary-glow); box-shadow: var(--shadow-gold); }
.choice.correct { border-color: var(--success); background: rgba(52,211,153,0.06); }
.choice.incorrect { border-color: var(--error); background: rgba(248,113,113,0.06); }
.choice.disabled { cursor: not-allowed; opacity: 0.5; }

.choice-letter {
    display: flex; align-items: center; justify-content: center;
    width: 26px; height: 26px;
    background: var(--border);
    color: var(--text-dim);
    border-radius: 6px;
    font-weight: 700; font-size: 0.7rem; font-family: var(--font-mono);
    margin-right: 0.7rem; flex-shrink: 0;
    transition: all var(--fast);
}
.choice.selected .choice-letter { background: var(--primary-dark); color: #000; }
.choice.correct .choice-letter { background: var(--success); color: #000; }
.choice.incorrect .choice-letter { background: var(--error); color: #000; }

.choice-text { flex: 1; font-size: 0.82rem; line-height: 1.5; color: var(--text-dim); }
.choice.selected .choice-text, .choice:hover .choice-text { color: var(--text); }

/* Explanation */
.explanation {
    background: rgba(52,211,153,0.04);
    padding: 0.85rem;
    border-radius: var(--radius);
    margin-top: 0.75rem;
    border-left: 2px solid var(--success);
}
.explanation h4 { color: var(--success); margin-bottom: 0.3rem; font-weight: 600; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; }
.explanation h4::before { content: none; }
.explanation p { font-size: 0.8rem; color: var(--text-dim); margin-bottom: 0; line-height: 1.6; }

#correct-answer {
    font-weight: 600; color: var(--success); font-size: 0.85rem;
    background: rgba(52,211,153,0.05);
    padding: 0.5rem 0.7rem; border-radius: var(--radius);
    border: 1px solid rgba(52,211,153,0.15);
    font-family: var(--font-mono);
}

/* Card Actions */
.card-actions { text-align: center; margin-top: 1rem; display: flex; gap: 0.5rem; justify-content: center; }

/* Navigation */
.navigation { display: flex; justify-content: space-between; align-items: center; padding-top: 0.75rem; border-top: 1px solid var(--border-subtle); }

/* Results */
.score-summary { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.6rem; margin: 1.25rem 0; }

.score-item {
    text-align: center; padding: 1rem 0.5rem;
    background: var(--bg-body); border-radius: var(--radius);
    border: 1px solid var(--border);
    position: relative;
}
/* Gold shimmer on score items */
.score-item::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; height: 1px;
    background: linear-gradient(90deg, transparent, rgba(245,197,24,0.15), transparent);
}

.score-label {
    display: block; font-weight: 600; color: var(--text-muted);
    margin-bottom: 0.25rem; font-size: 0.65rem;
    text-transform: uppercase; letter-spacing: 0.08em;
}
.score-value {
    display: block; font-size: 1.4rem; font-weight: 800;
    color: var(--primary); font-family: var(--font-mono);
}

#results-section h2 { color: var(--text); margin-bottom: 0.5rem; font-size: 1.15rem; text-align: center; font-weight: 700; }

.results-actions { display: flex; gap: 0.5rem; justify-content: center; flex-wrap: wrap; }

/* Recent Topics */
.recent-topics { margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid var(--border-subtle); }
.recent-topics-title { font-size: 0.65rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 0.5rem; }
.recent-topics-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 0.4rem; }
.recent-topic-card {
    display: flex; align-items: center; gap: 0.6rem;
    padding: 0.5rem 0.65rem;
    background: var(--bg-body); border: 1px solid var(--border-subtle);
    border-radius: var(--radius); cursor: pointer;
    transition: all var(--fast); text-decoration: none;
}
.recent-topic-card:hover { border-color: rgba(245,197,24,0.25); background: var(--primary-subtle); }
.recent-topic-info { flex: 1; min-width: 0; }
.recent-topic-name { display: block; font-size: 0.72rem; font-weight: 600; color: var(--text-dim); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.recent-topic-card:hover .recent-topic-name { color: var(--text); }
.recent-topic-meta { display: block; font-size: 0.6rem; color: var(--text-muted); margin-top: 0.1rem; }
.recent-topic-score { font-size: 0.72rem; font-weight: 700; font-family: var(--font-mono); flex-shrink: 0; }

/* Floating Side Nav — icon-only with hover popovers, never scrolls */
.side-nav {
    position: fixed;
    left: var(--nav-left, max(0.5rem, calc(50% - 550px - 56px)));
    top: var(--nav-top, 220px);
    display: flex; flex-direction: column; gap: 2px;
    z-index: 100;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 0.3rem;
    box-shadow: var(--shadow-lg);
}
.side-nav-item {
    display: flex; align-items: center; justify-content: center;
    width: 38px; height: 38px;
    border-radius: var(--radius);
    text-decoration: none; color: var(--text-muted);
    transition: all var(--fast);
    position: relative; cursor: pointer;
    background: none; border: none; font-family: inherit; padding: 0;
}
.side-nav-item:hover { background: var(--primary-subtle); color: var(--primary); }
.side-nav-icon { width: 18px; height: 18px; stroke-width: 1.75; }
.side-nav-label { display: none; }
.side-nav-spacer { height: 1px; background: var(--border-subtle); margin: 0.15rem 0.25rem; }

/* Tooltip on hover */
.side-nav > .side-nav-item::after {
    content: attr(title);
    position: absolute; left: calc(100% + 8px); top: 50%; transform: translateY(-50%);
    background: var(--bg-elevated); border: 1px solid var(--border);
    color: var(--text); font-size: 0.68rem; font-weight: 600;
    padding: 0.2rem 0.45rem; border-radius: 5px;
    white-space: nowrap; pointer-events: none;
    opacity: 0; transition: opacity 0.12s ease;
    box-shadow: var(--shadow);
}
.side-nav > .side-nav-item:hover::after { opacity: 1; }
.side-nav-trigger::after { content: none !important; }

/* Nav group with hover popover */
.side-nav-group { position: relative; }
.side-nav-popover {
    position: absolute; left: 100%; top: 0;
    padding-left: 6px; /* invisible hover bridge */
    opacity: 0; pointer-events: none;
    transition: opacity 0.15s ease;
    z-index: 101;
}
.popover-inner {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 0.25rem;
    min-width: 155px; box-shadow: var(--shadow-lg);
}
.side-nav-group:hover .side-nav-popover,
.side-nav-group:focus-within .side-nav-popover {
    opacity: 1; pointer-events: auto;
}
.popover-item {
    display: flex; align-items: center; gap: 0.45rem;
    padding: 0.4rem 0.55rem; border-radius: var(--radius);
    text-decoration: none; color: var(--text-dim);
    font-size: 0.75rem; font-weight: 500;
    transition: all var(--fast); white-space: nowrap;
}
.popover-item:hover { background: var(--primary-subtle); color: var(--text); }
.pop-icon { width: 14px; height: 14px; stroke-width: 1.75; flex-shrink: 0; }

/* Mobile bottom bar */
.mobile-only { display: none; }

@media (max-width: 900px) {
    .side-nav-group, .side-nav-spacer,
    .side-nav-item[title="Settings"],
    .side-nav-user { display: none !important; }
    .mobile-only { display: flex !important; }

    .side-nav {
        position: fixed; left: 0; right: 0; bottom: 0; top: auto !important;
        flex-direction: row; justify-content: space-around;
        border-radius: 0; border-left: none; border-right: none; border-bottom: none;
        padding: 0.3rem 0; width: auto;
        background: rgba(14,14,14,0.97); backdrop-filter: blur(16px);
    }
    .side-nav-item { width: auto; height: auto; flex: 1; padding: 0.5rem 0; }
    .side-nav-item::after { display: none !important; }
    .side-nav-icon { width: 20px; height: 20px; }
    .container { padding-bottom: 4rem; }
    #more-menu-btn { background: none; border: none; cursor: pointer; font-family: inherit; color: var(--text-muted); }
}

@media (min-width: 901px) {
    .more-menu { display: none !important; }
    #more-menu-btn { display: none !important; }
}

/* More Menu (mobile slide-up) */
.more-menu {
    position: fixed; bottom: 3.5rem; left: 0; right: 0;
    z-index: 199; padding: 0.5rem;
    pointer-events: none; opacity: 0; transform: translateY(10px);
    transition: opacity 0.2s ease, transform 0.25s cubic-bezier(0.34,1.56,0.64,1);
    display: block !important; /* override .hidden display:none */
}
.more-menu.hidden { opacity: 0; pointer-events: none; transform: translateY(10px); }
.more-menu.visible { pointer-events: auto; opacity: 1; transform: translateY(0); }
.more-menu-inner {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 0.4rem;
    box-shadow: 0 -4px 24px rgba(0,0,0,0.5);
    max-height: 60vh; overflow-y: auto;
}
.more-menu-item {
    display: flex; align-items: center; gap: 0.5rem;
    padding: 0.55rem 0.75rem; border-radius: var(--radius);
    text-decoration: none; color: var(--text-dim);
    font-size: 0.82rem; font-weight: 500;
    transition: all var(--fast); cursor: pointer;
}
.more-menu-item:hover { background: var(--primary-subtle); color: var(--text); }
.more-menu-item .icon { width: 16px; height: 16px; flex-shrink: 0; }
.more-menu-divider { height: 1px; background: var(--border-subtle); margin: 0.3rem 0.5rem; }

@media (min-width: 901px) {
    .more-menu { display: none !important; }
    #more-menu-btn { display: none !important; }
}

/* Footer */
.footer { text-align: center; margin-top: 1rem; padding: 1rem 0; color: var(--text-muted); font-size: 0.7rem; }

.ai-disclaimer {
    background: var(--primary-subtle);
    border: 1px solid rgba(245,197,24,0.1);
    border-radius: var(--radius); padding: 0.55rem 0.8rem;
    font-size: 0.65rem; line-height: 1.5; color: var(--text-muted);
    margin-bottom: 0.75rem; text-align: left;
}
.ai-disclaimer strong { color: var(--text-dim); font-weight: 600; }

/* Error Toast */
.error-toast { position: fixed; top: 1rem; right: 1rem; max-width: 340px; z-index: 1000; transform: translateX(380px); transition: transform var(--normal); }
.error-toast.show { transform: translateX(0); }
.error-content {
    display: flex; align-items: flex-start; gap: 0.5rem; padding: 0.7rem;
    background: #1a0505; border: 1px solid rgba(248,113,113,0.2);
    color: #fca5a5; border-radius: var(--radius); box-shadow: var(--shadow-lg); font-size: 0.8rem;
}
.error-icon { font-size: 0.9rem; flex-shrink: 0; }
.error-message { flex: 1; font-weight: 500; }
.error-close { background: none; border: none; color: #fca5a5; font-size: 1.1rem; cursor: pointer; padding: 0; line-height: 1; }

/* Ripple */
.ripple { position: absolute; border-radius: 50%; background: rgba(245,197,24,0.15); transform: scale(0); animation: ripple 0.5s linear; pointer-events: none; }
@keyframes ripple { to { transform: scale(4); opacity: 0; } }

/* Accessibility */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.btn:focus, .input-group input:focus, .control-group select:focus, .choice:focus { outline: 2px solid var(--primary); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; } }

/* Responsive */
@media (max-width: 600px) {
    .container { padding: 1rem 0.75rem; }
    .section { padding: 1.25rem; }
    header h1 { font-size: 1.2rem; }
    .controls { grid-template-columns: 1fr; gap: 0.75rem; }
    .flashcard { padding: 1.25rem; min-height: 220px; }
    .choice { padding: 0.55rem 0.7rem; }
    .choice-letter { width: 22px; height: 22px; font-size: 0.65rem; margin-right: 0.6rem; border-radius: 5px; }
    .choice-text { font-size: 0.78rem; }
    .card-content h3 { font-size: 0.75rem; }
    .card-content p { font-size: 0.82rem; }
    .score-summary { gap: 0.4rem; }
    .score-item { padding: 0.7rem 0.4rem; }
    .score-value { font-size: 1.15rem; }
    .navigation { gap: 0.5rem; }
    .navigation .btn { flex: 1; font-size: 0.78rem; padding: 0.45rem; }
    .card-actions .btn { font-size: 0.78rem; padding: 0.45rem 0.9rem; }
    .results-actions { flex-direction: column; }
    .results-actions .btn, .results-actions a { width: 100%; text-align: center; }
    .consent-banner { padding: 1rem; }
    .consent-actions { flex-direction: column; }
    .consent-btn { width: 100%; }
    .ai-disclaimer { font-size: 0.6rem; }
    .recent-topics-grid { grid-template-columns: 1fr; }
}

/* ── Cookie Consent Banner ─────────────────────────────── */
#consent-overlay {
    position: fixed; inset: 0; z-index: 9999;
    display: flex; align-items: flex-end; justify-content: center;
    background: rgba(0,0,0,0); transition: background 0.3s ease; padding: 1rem;
}
#consent-overlay.visible { background: rgba(0,0,0,0.6); backdrop-filter: blur(6px); }

.consent-banner {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 1.5rem;
    max-width: 480px; width: 100%;
    transform: translateY(100%); opacity: 0;
    transition: transform 0.35s cubic-bezier(0.16,1,0.3,1), opacity 0.3s ease;
    box-shadow: var(--shadow-lg);
}
#consent-overlay.visible .consent-banner { transform: translateY(0); opacity: 1; }

.consent-header { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 0.4rem; }
.consent-icon { font-size: 1.1rem; }
.consent-header h2 { font-size: 0.95rem; font-weight: 700; color: var(--text); }
.consent-desc { font-size: 0.75rem; color: var(--text-muted); line-height: 1.5; margin-bottom: 0.85rem; }

.consent-categories { display: flex; flex-direction: column; gap: 0.35rem; margin-bottom: 0.85rem; }
.consent-category {
    display: flex; align-items: center; justify-content: space-between; gap: 0.6rem;
    padding: 0.5rem 0.65rem; background: var(--bg-body);
    border: 1px solid var(--border-subtle); border-radius: var(--radius);
    cursor: pointer; transition: border-color var(--fast);
}
.consent-category:hover { border-color: rgba(245,197,24,0.2); }
.consent-category.locked { opacity: 0.6; cursor: default; }
.consent-category.locked:hover { border-color: var(--border-subtle); }

.consent-cat-info { flex: 1; min-width: 0; }
.consent-cat-name { display: block; font-size: 0.75rem; font-weight: 600; color: var(--text-dim); margin-bottom: 0.1rem; }
.consent-cat-desc { display: block; font-size: 0.65rem; color: var(--text-muted); line-height: 1.4; }

.consent-toggle-wrap { position: relative; width: 36px; height: 18px; flex-shrink: 0; }
.consent-toggle { opacity: 0; width: 0; height: 0; position: absolute; }
.consent-toggle-slider {
    position: absolute; inset: 0; background: var(--border); border-radius: 9px;
    transition: background 0.2s ease; cursor: pointer;
}
.consent-toggle-slider::after {
    content: ''; position: absolute; top: 2px; left: 2px;
    width: 14px; height: 14px; background: var(--text-muted); border-radius: 50%;
    transition: transform 0.2s ease, background 0.2s ease;
}
.consent-toggle:checked + .consent-toggle-slider { background: var(--primary-dark); }
.consent-toggle:checked + .consent-toggle-slider::after { transform: translateX(18px); background: #000; }
.consent-toggle:disabled + .consent-toggle-slider { cursor: default; }
.consent-toggle:focus-visible + .consent-toggle-slider { outline: 2px solid var(--primary); outline-offset: 2px; }

.consent-actions { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.consent-btn {
    flex: 1; min-width: 0; padding: 0.45rem 0.65rem; border: none;
    border-radius: var(--radius); font-size: 0.75rem; font-weight: 600;
    font-family: inherit; cursor: pointer; transition: all var(--fast); white-space: nowrap;
}
.consent-btn:hover { transform: translateY(-1px); }
.consent-btn-accept-all { background: var(--primary-dark); color: #000; font-weight: 700; }
.consent-btn-accept-all:hover { background: var(--primary); }
.consent-btn-save { background: var(--bg-elevated); color: var(--text-dim); border: 1px solid var(--border); }
.consent-btn-save:hover { border-color: rgba(245,197,24,0.3); color: var(--text); }
.consent-btn-reject { background: transparent; color: var(--text-muted); }
.consent-btn-reject:hover { color: var(--text-dim); }

@media (max-width: 480px) {
    .consent-banner { padding: 1.25rem; }
    .consent-actions { flex-direction: column; }
    .consent-btn { width: 100%; }
}

/* ── Auth Modal ────────────────────────────────────────── */
#auth-overlay {
    position: fixed; inset: 0; z-index: 10000;
    display: flex; align-items: center; justify-content: center;
    background: rgba(0,0,0,0); transition: background 0.3s ease; padding: 1rem;
}
#auth-overlay.visible { background: rgba(0,0,0,0.7); backdrop-filter: blur(6px); }

.auth-modal {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 1.5rem;
    max-width: 360px; width: 100%;
    transform: translateY(16px) scale(0.97); opacity: 0;
    transition: transform 0.3s cubic-bezier(0.34,1.56,0.64,1), opacity 0.25s ease;
    box-shadow: var(--shadow-lg);
    position: relative; overflow: hidden;
}
/* Gold top line on auth modal */
.auth-modal::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
}
#auth-overlay.visible .auth-modal { transform: translateY(0) scale(1); opacity: 1; }

.auth-modal h2 { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 0.2rem; }
.auth-subtitle { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 1rem; }
.auth-error { background: rgba(248,113,113,0.06); border: 1px solid rgba(248,113,113,0.2); color: var(--error); padding: 0.45rem 0.65rem; border-radius: var(--radius); font-size: 0.75rem; margin-bottom: 0.65rem; }

.auth-modal input {
    width: 100%; padding: 0.6rem 0.8rem; margin-bottom: 0.5rem;
    border: 1px solid var(--border); border-radius: var(--radius);
    background: var(--bg-body); color: var(--text); font-family: inherit; font-size: 0.82rem;
    outline: none; transition: border-color var(--fast), box-shadow var(--fast);
}
.auth-modal input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-glow); }
.auth-modal input::placeholder { color: var(--text-muted); }

.auth-toggle { text-align: center; margin-top: 0.65rem; font-size: 0.75rem; color: var(--text-muted); }
.auth-link { background: none; border: none; color: var(--primary); font-weight: 600; cursor: pointer; font-family: inherit; font-size: inherit; padding: 0; }
.auth-link:hover { text-decoration: underline; }

#user-info { margin-top: 0; font-size: 0.75rem; color: var(--text-muted); }
.user-avatar {
    width: 24px; height: 24px; border-radius: 50%;
    background: var(--primary-dark); color: #000;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.7rem; font-weight: 700; font-family: var(--font-sans);
}
.side-nav-user { cursor: pointer; }
.side-nav-user:hover .user-avatar { background: var(--primary); }
.side-nav-divider {
    height: 1px; background: var(--border); margin: 0.25rem 0.4rem;
}

/* ── Enhanced UX Elements ──────────────────────────────── */

/* Large button variant */
.btn-lg { padding: 0.7rem 1.5rem; font-size: 0.9rem; }
.btn-full { width: 100%; }

/* Loading state on buttons */
.btn.is-loading { pointer-events: none; opacity: 0.7; }
.btn.is-loading::after {
    content: ''; display: inline-block; width: 14px; height: 14px;
    border: 2px solid transparent; border-top-color: currentColor;
    border-radius: 50%; animation: spin 0.6s linear infinite; margin-left: 0.4rem;
}

/* Session running stats */
.session-stats {
    display: flex; gap: 0.75rem; justify-content: center;
    margin-bottom: 0.75rem; font-family: var(--font-mono);
    font-size: 0.75rem; font-weight: 600;
}
.stat-correct { color: var(--success); }
.stat-wrong { color: var(--error); }

/* Answer feedback banner */
.answer-feedback {
    padding: 0.6rem 0.85rem;
    border-radius: var(--radius);
    font-size: 0.82rem; font-weight: 700;
    margin-bottom: 0.75rem;
    display: flex; align-items: center; gap: 0.5rem;
    animation: feedbackSlide 0.3s cubic-bezier(0.34,1.56,0.64,1);
}
.answer-feedback.correct {
    background: rgba(52,211,153,0.08);
    border: 1px solid rgba(52,211,153,0.2);
    color: var(--success);
}
.answer-feedback.wrong {
    background: rgba(248,113,113,0.08);
    border: 1px solid rgba(248,113,113,0.2);
    color: var(--error);
}
@keyframes feedbackSlide {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Keyboard hints */
.keyboard-hint {
    text-align: center;
    font-size: 0.65rem;
    color: var(--text-muted);
    margin-top: 0.6rem;
    letter-spacing: 0.02em;
    transition: opacity var(--fast);
}

/* Loading timer */
.loading-timer {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* Choice hover number hint */
.choice::after {
    content: attr(data-key);
    position: absolute; right: 0.7rem; top: 50%; transform: translateY(-50%);
    font-size: 0.6rem; font-family: var(--font-mono);
    color: var(--text-muted); opacity: 0;
    transition: opacity var(--fast);
    background: var(--border); padding: 0.1rem 0.35rem; border-radius: 3px;
}
.choice:hover::after { opacity: 0.6; }
.choice.disabled::after { display: none; }

/* ── Lucide Icons ──────────────────────────────────────── */
.icon { width: 16px; height: 16px; stroke-width: 2; vertical-align: -2px; }
.side-nav-icon { width: 20px; height: 20px; stroke-width: 1.75; }
.consent-icon-svg { width: 20px; height: 20px; stroke: var(--primary); stroke-width: 1.75; flex-shrink: 0; }

/* ── Review Banner ─────────────────────────────────────── */
.review-banner { margin-top: 1rem; }
.review-banner-link {
    display: flex; align-items: center; justify-content: space-between;
    padding: 0.7rem 0.85rem; gap: 0.75rem;
    background: linear-gradient(135deg, rgba(245,197,24,0.06), rgba(245,197,24,0.02));
    border: 1px solid rgba(245,197,24,0.15);
    border-radius: var(--radius-lg);
    text-decoration: none; color: var(--text);
    transition: all var(--fast);
}
.review-banner-link:hover { border-color: rgba(245,197,24,0.35); background: rgba(245,197,24,0.08); }
.review-banner-left { display: flex; align-items: center; gap: 0.6rem; }
.review-banner-icon { width: 20px; height: 20px; stroke: var(--primary); flex-shrink: 0; }
.review-banner-title { display: block; font-size: 0.82rem; font-weight: 600; color: var(--text); }
.review-banner-sub { display: block; font-size: 0.68rem; color: var(--text-muted); }
.review-banner-action { font-size: 0.78rem; font-weight: 600; color: var(--primary); white-space: nowrap; }

/* Review nav badge */
.review-badge {
    position: absolute; top: 2px; right: 2px;
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--primary); box-shadow: 0 0 6px rgba(245,197,24,0.5);
}

/* ── TTS Button ────────────────────────────────────────── */
.question-header { display: flex; align-items: center; justify-content: space-between; }
.question-actions { display: flex; gap: 0.3rem; }
.tts-btn {
    background: none; border: 1px solid var(--border); border-radius: var(--radius);
    padding: 0.3rem; cursor: pointer; color: var(--text-muted);
    transition: all var(--fast); display: flex; align-items: center;
}
.tts-btn:hover { border-color: var(--primary); color: var(--primary); }
.tts-btn .icon { width: 14px; height: 14px; }

/* ── Sign-up Prompt ────────────────────────────────────── */
.signup-prompt {
    margin-top: 1rem; opacity: 0; transform: translateY(8px);
    transition: opacity 0.3s ease, transform 0.3s cubic-bezier(0.34,1.56,0.64,1);
}
.signup-prompt.visible { opacity: 1; transform: translateY(0); }
.signup-prompt-content {
    background: linear-gradient(135deg, rgba(245,197,24,0.06), rgba(245,197,24,0.02));
    border: 1px solid rgba(245,197,24,0.15);
    border-radius: var(--radius-lg); padding: 1rem 1.25rem;
}
.signup-prompt-text { margin-bottom: 0.75rem; }
.signup-prompt-text strong { display: block; font-size: 0.9rem; color: var(--text); margin-bottom: 0.2rem; }
.signup-prompt-text span { font-size: 0.78rem; color: var(--text-dim); }
.signup-prompt-actions { display: flex; gap: 0.5rem; }
.signup-prompt-actions .btn { flex: 1; }

/* ── Flag Menu ─────────────────────────────────────────── */
.flag-menu {
    position: absolute; right: 0; top: 100%; margin-top: 0.3rem;
    background: var(--bg-elevated); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 0.25rem;
    z-index: 50; min-width: 160px;
    opacity: 0; transform: translateY(-4px);
    transition: opacity 0.15s ease, transform 0.15s ease;
    box-shadow: var(--shadow-lg);
}
.flag-menu.visible { opacity: 1; transform: translateY(0); }
.flag-option {
    display: block; width: 100%; text-align: left;
    padding: 0.4rem 0.6rem; border: none; background: none;
    color: var(--text-dim); font-size: 0.75rem; font-family: inherit;
    cursor: pointer; border-radius: 4px; transition: all var(--fast);
}
.flag-option:hover { background: var(--primary-subtle); color: var(--text); }
.tts-btn.flagged { border-color: var(--warning); }

/* ── Resume Banner ─────────────────────────────────────── */
.resume-banner {
    background: var(--bg-card); border: 1px solid rgba(245,197,24,0.2);
    border-radius: var(--radius-lg); padding: 1rem 1.25rem;
    margin-bottom: 1rem; transition: opacity 0.2s ease;
}
.resume-banner-content { margin-bottom: 0.6rem; }
.resume-banner-content strong { display: block; font-size: 0.85rem; color: var(--text); margin-bottom: 0.15rem; }
.resume-banner-content span { font-size: 0.75rem; color: var(--text-dim); }
.resume-banner-actions { display: flex; gap: 0.5rem; }
.resume-banner-actions .btn { flex: 1; }

/* ── Achievement Toast ─────────────────────────────────── */
.achievement-toast {
    position: fixed; top: 1.5rem; left: 50%; transform: translateX(-50%) translateY(-80px);
    z-index: 10001; transition: transform 0.5s cubic-bezier(0.34,1.56,0.64,1), opacity 0.3s ease;
    opacity: 0;
}
.achievement-toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }
.achievement-toast-inner {
    display: flex; align-items: center; gap: 0.6rem;
    background: linear-gradient(135deg, rgba(245,197,24,0.15), rgba(245,197,24,0.05));
    border: 1px solid rgba(245,197,24,0.3);
    border-radius: var(--radius-lg); padding: 0.75rem 1.25rem;
    box-shadow: 0 8px 32px rgba(245,197,24,0.15), var(--shadow-lg);
    backdrop-filter: blur(12px);
}
.achievement-toast-icon { font-size: 1.5rem; }
.achievement-toast-text strong { display: block; font-size: 0.85rem; color: var(--primary); }
.achievement-toast-text span { font-size: 0.72rem; color: var(--text-dim); }

/* ── Session Summary ───────────────────────────────────── */
.session-summary { margin: 1rem 0; }
.summary-header {
    font-size: 0.7rem; font-weight: 700; color: var(--text-muted);
    text-transform: uppercase; letter-spacing: 0.08em;
    margin-bottom: 0.5rem; padding-bottom: 0.3rem;
    border-bottom: 1px solid var(--border-subtle);
}
.summary-item {
    display: flex; align-items: flex-start; gap: 0.5rem;
    padding: 0.4rem 0; border-bottom: 1px solid var(--border-subtle);
}
.summary-item:last-child { border-bottom: none; }
.summary-num {
    font-family: var(--font-mono); font-size: 0.65rem; font-weight: 700;
    color: var(--text-muted); width: 18px; flex-shrink: 0; padding-top: 0.1rem;
}
.summary-detail { flex: 1; min-width: 0; }
.summary-q { font-size: 0.75rem; color: var(--text-dim); line-height: 1.4; }
.summary-answer { font-size: 0.68rem; margin-top: 0.15rem; font-weight: 600; }
.summary-item.correct .summary-answer { color: var(--success); }
.summary-item.wrong .summary-answer { color: var(--error); }

/* ── Content Warning ───────────────────────────────────── */
.content-warning {
    display: flex; align-items: center; gap: 0.4rem;
    padding: 0.5rem 0.75rem; margin-top: 0.75rem;
    background: rgba(251,191,36,0.06); border: 1px solid rgba(251,191,36,0.15);
    border-radius: var(--radius); font-size: 0.75rem; color: var(--warning);
}

/* ── Search ────────────────────────────────────────────── */
.search-group { margin-bottom: 1.25rem; }
.search-input-row { display: flex; gap: 0.4rem; }
.search-input-row input {
    flex: 1; padding: 0.55rem 0.8rem; border: 1px solid var(--border);
    border-radius: var(--radius); background: var(--bg-input); color: var(--text);
    font-family: inherit; font-size: 0.82rem; outline: none;
    transition: border-color var(--fast);
}
.search-input-row input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-glow); }
.search-input-row input::placeholder { color: var(--text-muted); }
.search-results {
    margin-top: 0.4rem; background: var(--bg-elevated); border: 1px solid var(--border);
    border-radius: var(--radius); max-height: 240px; overflow-y: auto;
}
.search-result-item {
    padding: 0.5rem 0.7rem; cursor: pointer; border-bottom: 1px solid var(--border-subtle);
    transition: background var(--fast);
}
.search-result-item:last-child { border-bottom: none; }
.search-result-item:hover { background: var(--primary-subtle); }
.search-result-title { font-size: 0.78rem; font-weight: 600; color: var(--text); margin-bottom: 0.1rem; }
.search-result-desc { font-size: 0.68rem; color: var(--text-muted); line-height: 1.4; }

/* ── Timer ──────────────────────────────────────────────── */
.session-timer {
    font-family: var(--font-mono); font-weight: 700; font-size: 0.8rem;
    padding: 0.15rem 0.5rem; border-radius: 4px;
    background: var(--bg-elevated); border: 1px solid var(--border);
    transition: color 0.3s ease;
}

/* ── Hint Eliminated ───────────────────────────────────── */
.choice.hint-eliminated {
    opacity: 0.15 !important;
    pointer-events: none;
    text-decoration: line-through;
    transition: opacity 0.4s ease;
}

/* ── Keyboard Shortcuts Modal ──────────────────────────── */
.kb-help-overlay {
    position: fixed; inset: 0; z-index: 10001;
    display: flex; align-items: center; justify-content: center;
    background: rgba(0,0,0,0); transition: background 0.25s ease; padding: 1rem;
}
.kb-help-overlay.visible { background: rgba(0,0,0,0.6); backdrop-filter: blur(4px); }
.kb-help-modal {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 1.25rem; max-width: 340px; width: 100%;
    transform: translateY(12px) scale(0.97); opacity: 0;
    transition: all 0.3s cubic-bezier(0.34,1.56,0.64,1);
}
.kb-help-overlay.visible .kb-help-modal { transform: translateY(0) scale(1); opacity: 1; }
.kb-help-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.75rem; }
.kb-help-header h3 { font-size: 0.9rem; color: var(--text); }
.kb-help-close { background: none; border: none; color: var(--text-muted); font-size: 1.2rem; cursor: pointer; }
.kb-help-grid { display: flex; flex-direction: column; gap: 0.4rem; }
.kb-row { display: flex; align-items: center; gap: 0.4rem; font-size: 0.78rem; color: var(--text-dim); }
.kb-row span { margin-left: auto; }
kbd {
    display: inline-block; padding: 0.15rem 0.4rem;
    background: var(--bg-elevated); border: 1px solid var(--border);
    border-radius: 4px; font-family: var(--font-mono); font-size: 0.7rem;
    color: var(--text); min-width: 22px; text-align: center;
}

/* ── Font Size Preferences ─────────────────────────────── */
[data-font-size="small"] { font-size: 13px; }
[data-font-size="medium"] { font-size: 15px; }
[data-font-size="large"] { font-size: 17px; }
[data-font-size="large"] .choice-text { font-size: 0.95rem; }
[data-font-size="large"] .card-content p { font-size: 1rem; }
[data-font-size="small"] .choice-text { font-size: 0.75rem; }
[data-font-size="small"] .card-content p { font-size: 0.8rem; }