/* ============================================
   Deep Learning Interactive Tutorial - Styles
   ============================================ */

:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: #1a2035;
    --bg-card-hover: #1f2847;
    --bg-input: #0d1220;
    --text-primary: #e8eaf0;
    --text-secondary: #8b95a8;
    --text-muted: #5a6478;
    --accent-primary: #6366f1;
    --accent-secondary: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.3);
    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.1);
    --error: #ef4444;
    --error-bg: rgba(239, 68, 68, 0.1);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.1);
    --border: #1e293b;
    --border-light: #2d3a50;
    --gradient-1: linear-gradient(135deg, #6366f1, #a855f7);
    --gradient-2: linear-gradient(135deg, #3b82f6, #6366f1);
    --gradient-3: linear-gradient(135deg, #10b981, #3b82f6);
    --sidebar-width: 280px;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ---- Sidebar ---- */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: var(--transition);
}

.sidebar-header {
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon { font-size: 28px; }

.logo-text {
    font-size: 20px;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sidebar-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.sidebar-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-secondary);
    transition: var(--transition);
}

.progress-overview {
    padding: 20px;
    border-bottom: 1px solid var(--border);
}

.progress-label {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 500;
}

.progress-bar {
    height: 6px;
    background: var(--bg-primary);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: var(--gradient-1);
    border-radius: 3px;
    transition: width 0.5s ease;
}

.xp-display {
    margin-top: 10px;
    font-size: 14px;
    font-weight: 600;
    color: var(--warning);
    display: flex;
    align-items: center;
    gap: 6px;
}

.xp-icon { font-size: 16px; }

.nav-menu {
    list-style: none;
    padding: 12px 0;
    overflow-y: auto;
    flex: 1;
}

.nav-section {
    padding: 16px 20px 8px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
}

.nav-item {
    padding: 10px 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
    color: var(--text-secondary);
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.nav-item.active {
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-secondary);
    border-left-color: var(--accent-primary);
}

.nav-item.completed .nav-status::after {
    content: '\2713';
    color: var(--success);
    font-weight: 700;
}

.nav-status {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 2px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    flex-shrink: 0;
}

.nav-item.completed .nav-status {
    border-color: var(--success);
    background: var(--success-bg);
}

.nav-item.active .nav-status {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.15);
}

.nav-link-item {
    padding: 10px 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-secondary);
    border-left: 3px solid transparent;
    text-decoration: none;
    transition: var(--transition);
}

.nav-link-item:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.nav-status-link {
    color: var(--text-muted);
    font-weight: 700;
    line-height: 1;
}

.glossary-header {
    margin-bottom: 20px;
}

.glossary-book {
    background:
        linear-gradient(180deg, rgba(255, 250, 240, 0.98), rgba(245, 237, 221, 0.96));
    border: 1px solid rgba(180, 147, 93, 0.22);
    border-radius: 22px;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
    padding: 0;
    overflow: hidden;
}

.glossary-book-page {
    max-width: 860px;
    margin: 0 auto;
    padding: 56px 56px 72px;
    color: #2d2216;
    font-family: "Georgia", "Times New Roman", serif;
    line-height: 1.85;
    background:
        linear-gradient(90deg, rgba(166, 126, 72, 0.08), transparent 28px),
        linear-gradient(180deg, rgba(255, 255, 255, 0.32), rgba(250, 243, 229, 0.12));
}

.glossary-book-intro {
    margin: 0 0 28px;
    font-size: 20px;
    color: #5d4a33;
}

.glossary-book-chapter {
    margin-top: 44px;
    padding-top: 30px;
    border-top: 1px solid rgba(125, 92, 48, 0.18);
}

.glossary-book-chapter:first-of-type {
    margin-top: 0;
    padding-top: 0;
    border-top: 0;
}

.glossary-book-chapter h2 {
    margin: 0 0 18px;
    color: #2a1f12;
    font-size: 34px;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.glossary-book-subhead {
    margin: 26px 0 10px;
    color: #6d4b22;
    font-size: 21px;
    line-height: 1.35;
}

.glossary-entry {
    margin: 0 0 12px;
    font-size: 18px;
    color: #352819;
}

.glossary-entry strong {
    color: #1f160d;
}

@media (max-width: 768px) {
    .glossary-book-page {
        padding: 32px 24px 44px;
    }

    .glossary-book-intro {
        font-size: 18px;
    }

    .glossary-book-chapter h2 {
        font-size: 28px;
    }

    .glossary-book-subhead {
        font-size: 19px;
    }

    .glossary-entry {
        font-size: 17px;
    }
}

/* ---- Main Content ---- */
.content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    padding: 40px;
}

.site-footer {
    margin-left: var(--sidebar-width);
    padding: 18px 40px 28px;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 14px;
    text-align: center;
}

.site-footer a {
    color: var(--accent-secondary);
    font-weight: 600;
    text-decoration: none;
}

.site-footer a:hover {
    color: var(--text-primary);
    text-decoration: underline;
}

.chapter-container {
    display: none;
    max-width: 900px;
    margin: 0 auto;
    animation: fadeIn 0.4s ease;
}

.chapter-container.active { display: block; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ---- Welcome Screen ---- */
.welcome-hero {
    text-align: center;
    padding: 80px 20px;
}

.welcome-hero h1 {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.2;
}

.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 860px;
    margin: 0 auto 22px;
}

.welcome-proof {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    max-width: 900px;
    margin: 0 auto 32px;
}

.proof-item {
    background: rgba(99, 102, 241, 0.08);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    padding: 14px 12px;
}

.proof-label {
    display: block;
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary);
}

.proof-value {
    display: block;
    margin-top: 4px;
    font-size: 12px;
    color: var(--text-secondary);
}

.welcome-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 700px;
    margin: 0 auto 50px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 30px 20px;
    transition: var(--transition);
}

.feature-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 32px var(--accent-glow);
}

.feature-icon { font-size: 36px; margin-bottom: 12px; }
.feature-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.feature-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.5; }

.welcome-roadmap {
    margin: -20px auto 24px;
    max-width: 900px;
    padding: 18px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.welcome-roadmap h3 {
    font-size: 18px;
    margin-bottom: 6px;
}

.welcome-roadmap p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 14px;
}

.roadmap-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
}

.roadmap-chip {
    border: 1px solid var(--border-light);
    background: rgba(99, 102, 241, 0.08);
    color: var(--text-primary);
    border-radius: 999px;
    padding: 10px 14px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.roadmap-chip:hover {
    border-color: var(--accent-primary);
    transform: translateY(-1px);
    background: rgba(99, 102, 241, 0.18);
}

.learning-radar {
    margin: 0 auto 24px;
    max-width: 920px;
    padding: 18px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-align: left;
}

.learning-radar h3 {
    font-size: 18px;
    margin-bottom: 6px;
}

.learning-radar p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 14px;
}

.learning-radar-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 14px;
    align-items: stretch;
}

.radar-canvas-wrap {
    background: var(--bg-input);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    padding: 10px;
    min-height: 260px;
}

.radar-canvas-wrap canvas {
    width: 100%;
    height: 320px;
    display: block;
}

.radar-insights {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

.radar-insight-card {
    background: rgba(99, 102, 241, 0.08);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    padding: 12px;
}

.radar-insight-card h4 {
    margin-bottom: 6px;
    font-size: 14px;
    color: var(--text-primary);
}

.radar-insight-card p {
    margin: 0;
    font-size: 13px;
    line-height: 1.5;
}

.welcome-outcome {
    margin: -14px auto 24px;
    max-width: 860px;
    color: var(--text-secondary);
    font-size: 15px;
}

/* ---- Buttons ---- */
.btn-primary {
    background: var(--gradient-1);
    color: white;
    border: none;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.btn-small {
    padding: 8px 16px;
    font-size: 13px;
}

.btn-large {
    padding: 16px 40px;
    font-size: 17px;
}

.btn-success {
    background: var(--success);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

/* ---- Chapter Styles ---- */
.chapter-header {
    margin-bottom: 40px;
}

.chapter-badge {
    display: inline-block;
    background: rgba(99, 102, 241, 0.15);
    color: var(--accent-secondary);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 12px;
}

.chapter-header h1 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 12px;
}

.chapter-header p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ---- Section Cards ---- */
.section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    margin-bottom: 24px;
}

.section h2 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section h3 {
    font-size: 17px;
    font-weight: 600;
    margin: 20px 0 10px;
    color: var(--accent-secondary);
}

.section p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.7;
}

.section-icon {
    font-size: 24px;
}

/* ---- Interactive Canvas ---- */
.canvas-container {
    position: relative;
    background: var(--bg-input);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    margin: 16px 0;
}

.canvas-container canvas {
    display: block;
    width: 100%;
    cursor: crosshair;
}

.canvas-toolbar {
    display: flex;
    gap: 8px;
    padding: 12px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
}

/* ---- Network Visualization ---- */
.network-viz {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin: 16px 0;
    text-align: center;
}

.network-viz canvas {
    max-width: 100%;
}

/* ---- Controls ---- */
.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin: 16px 0;
    align-items: center;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.control-group label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.control-group select,
.control-group input[type="number"] {
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 14px;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    background: var(--bg-primary);
    border-radius: 3px;
    outline: none;
    width: 200px;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    border: 2px solid var(--bg-primary);
}

.slider-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    color: var(--accent-secondary);
    min-width: 50px;
}

/* ---- Prediction Results ---- */
.prediction-results {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    margin: 16px 0;
}

.prediction-bar {
    text-align: center;
}

.prediction-bar .bar-container {
    height: 100px;
    background: var(--bg-input);
    border-radius: 4px;
    position: relative;
    overflow: hidden;
    margin-bottom: 4px;
}

.prediction-bar .bar-fill {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--gradient-1);
    transition: height 0.3s ease;
    border-radius: 4px 4px 0 0;
}

.prediction-bar .bar-fill.top {
    background: var(--gradient-3);
}

.prediction-bar .label {
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 500;
}

.prediction-bar .confidence {
    font-size: 11px;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

/* ---- Info Box ---- */
.info-box {
    background: rgba(99, 102, 241, 0.08);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    margin: 16px 0;
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.info-box.success {
    background: var(--success-bg);
    border-color: rgba(16, 185, 129, 0.2);
}

.info-box.warning {
    background: var(--warning-bg);
    border-color: rgba(245, 158, 11, 0.2);
}

.info-box-icon { font-size: 20px; flex-shrink: 0; }
.info-box-text { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }

/* ---- Code Block ---- */
.code-block {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    margin: 16px 0;
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    line-height: 1.7;
    overflow-x: auto;
    white-space: pre;
    color: var(--text-secondary);
    tab-size: 4;
}

.code-block .keyword { color: #c084fc; }
.code-block .function { color: #60a5fa; }
.code-block .string { color: #34d399; }
.code-block .comment { color: var(--text-muted); }
.code-block .number { color: #fbbf24; }

/* ---- Interactive Graph ---- */
.graph-container {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    margin: 16px 0;
}

.graph-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: var(--transition);
}

.legend-item:hover { background: var(--bg-card); }

.legend-item.active { color: var(--text-primary); }

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* ---- Matrix Display ---- */
.matrix-display {
    display: inline-flex;
    flex-direction: column;
    margin: 8px 16px;
    vertical-align: middle;
}

.matrix-row {
    display: flex;
    gap: 4px;
}

.matrix-cell {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

.matrix-cell.highlight {
    background: rgba(99, 102, 241, 0.2);
    border-color: var(--accent-primary);
    color: var(--accent-secondary);
}

.matrix-cell.result {
    background: rgba(16, 185, 129, 0.15);
    border-color: var(--success);
    color: var(--success);
}

.matrix-cell input {
    width: 100%;
    height: 100%;
    background: transparent;
    border: none;
    color: inherit;
    text-align: center;
    font-family: inherit;
    font-size: inherit;
    font-weight: inherit;
    outline: none;
}

.matrix-operator {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    color: var(--text-muted);
    margin: 0 8px;
    vertical-align: middle;
}

.matrix-equation {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
    margin: 20px 0;
}

/* ---- Step Indicator ---- */
.step-indicator {
    display: flex;
    gap: 4px;
    margin: 20px 0;
}

.step-dot {
    width: 32px;
    height: 4px;
    border-radius: 2px;
    background: var(--border);
    transition: var(--transition);
}

.step-dot.active { background: var(--accent-primary); }
.step-dot.completed { background: var(--success); }

.step-explanation {
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    padding: 16px;
    margin: 16px 0;
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    line-height: 1.8;
    min-height: 60px;
}

/* ---- Gradient Descent ---- */
.gd-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin: 16px 0;
}

.gd-stat {
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    padding: 12px;
    text-align: center;
}

.gd-stat .stat-label {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.gd-stat .stat-value {
    font-size: 18px;
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent-secondary);
}

/* ---- Quiz Modal ---- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 200;
    backdrop-filter: blur(4px);
}

.modal-overlay.active { display: flex; }

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow);
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.95) translateY(10px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
    padding: 24px 28px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 { font-size: 20px; font-weight: 700; }

.quiz-progress {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

.modal-body { padding: 28px; }
.modal-footer {
    padding: 20px 28px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* Quiz Options */
.quiz-question {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 24px;
    line-height: 1.5;
}

.quiz-options { display: flex; flex-direction: column; gap: 10px; }

.quiz-option {
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 14px 18px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.quiz-option:hover {
    border-color: var(--accent-primary);
    background: var(--bg-card-hover);
}

.quiz-option.selected {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
}

.quiz-option.correct {
    border-color: var(--success);
    background: var(--success-bg);
}

.quiz-option.incorrect {
    border-color: var(--error);
    background: var(--error-bg);
}

.quiz-option-marker {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    flex-shrink: 0;
}

.quiz-option.selected .quiz-option-marker {
    border-color: var(--accent-primary);
    background: var(--accent-primary);
    color: white;
}

.quiz-feedback {
    margin-top: 20px;
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    line-height: 1.6;
    display: none;
}

.quiz-feedback.correct {
    display: block;
    background: var(--success-bg);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: var(--success);
}

.quiz-feedback.incorrect {
    display: block;
    background: var(--error-bg);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: var(--error);
}

.quiz-score {
    text-align: center;
    padding: 20px;
}

.quiz-score .score-number {
    font-size: 48px;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.quiz-score p {
    color: var(--text-secondary);
    margin-top: 8px;
}

/* ---- Achievement Toast ---- */
.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--bg-secondary);
    border: 1px solid var(--accent-primary);
    border-radius: var(--radius);
    padding: 16px 24px;
    display: flex;
    align-items: center;
    gap: 14px;
    box-shadow: 0 4px 24px rgba(99, 102, 241, 0.3);
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(30px);
    transition: opacity 0.4s ease, transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.4s ease;
    pointer-events: none;
    max-width: 360px;
}

.toast.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}
.toast-icon { font-size: 28px; }
.toast-title { font-size: 14px; font-weight: 700; color: var(--accent-secondary); }
.toast-message { font-size: 12px; color: var(--text-secondary); margin-top: 2px; }

/* ---- Utility ---- */
.hidden { display: none !important; }
.text-center { text-align: center; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-16 { margin-bottom: 16px; }

.tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
}

.tag-interactive { background: rgba(99, 102, 241, 0.15); color: var(--accent-secondary); }
.tag-quiz { background: rgba(245, 158, 11, 0.15); color: var(--warning); }
.tag-concept { background: rgba(16, 185, 129, 0.15); color: var(--success); }

/* Chapter navigation */
.chapter-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

/* Drawing canvas specific */
.draw-area {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 24px;
    align-items: start;
}

.draw-canvas-wrap {
    background: #000;
    border-radius: var(--radius);
    overflow: hidden;
    border: 2px solid var(--border);
}

.draw-canvas-wrap canvas {
    display: block;
    cursor: crosshair;
}

/* ---- Confusion Matrix (Ch 5.1) ---- */
.confusion-matrix {
    display: grid;
    grid-template-columns: auto 1fr 1fr;
    gap: 4px;
    max-width: 360px;
    margin: 16px auto;
}

.cm-header {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    text-align: center;
    padding: 8px;
}

.cm-cell {
    padding: 20px;
    text-align: center;
    border-radius: var(--radius-sm);
    font-family: 'JetBrains Mono', monospace;
    font-size: 20px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.cm-cell:hover { transform: scale(1.05); }

.cm-cell.tp { background: rgba(16, 185, 129, 0.2); color: var(--success); border: 1px solid rgba(16, 185, 129, 0.3); }
.cm-cell.fp { background: rgba(239, 68, 68, 0.15); color: var(--error); border: 1px solid rgba(239, 68, 68, 0.2); }
.cm-cell.fn { background: rgba(245, 158, 11, 0.15); color: var(--warning); border: 1px solid rgba(245, 158, 11, 0.2); }
.cm-cell.tn { background: rgba(99, 102, 241, 0.15); color: var(--accent-secondary); border: 1px solid rgba(99, 102, 241, 0.2); }

.cm-cell .cm-label {
    display: block;
    font-size: 10px;
    font-weight: 500;
    text-transform: uppercase;
    margin-top: 4px;
    opacity: 0.7;
}

.cm-cell .cm-adjust {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 6px;
}

.cm-cell .cm-adjust button {
    width: 22px; height: 22px;
    border-radius: 50%;
    border: 1px solid currentColor;
    background: transparent;
    color: inherit;
    cursor: pointer;
    font-size: 14px;
    font-weight: 700;
    display: flex; align-items: center; justify-content: center;
    opacity: 0.6;
    transition: var(--transition);
}

.cm-cell .cm-adjust button:hover { opacity: 1; }

/* ---- Dropout Visualization (Ch 5.2) ---- */
.neuron-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 8px;
    max-width: 400px;
    margin: 16px auto;
}

.neuron-dot {
    width: 40px; height: 40px;
    border-radius: 50%;
    background: var(--accent-primary);
    display: flex; align-items: center; justify-content: center;
    transition: var(--transition);
    margin: 0 auto;
}

.neuron-dot.dropped {
    background: rgba(255,255,255,0.08);
    border: 2px dashed var(--border-light);
}

/* ---- CNN Filter Grid (Ch 6.1) ---- */
.pixel-grid {
    display: inline-grid;
    gap: 2px;
    margin: 8px;
    vertical-align: middle;
}

.pixel-cell {
    width: 40px; height: 40px;
    display: flex; align-items: center; justify-content: center;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px; font-weight: 600;
    border-radius: 3px;
    transition: var(--transition);
}

/* ---- Attention Heatmap (Ch 8.3) ---- */
.attention-sentence {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 16px 0;
    justify-content: center;
}

.attention-word {
    padding: 8px 14px;
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition);
}

.attention-word:hover { border-color: var(--accent-primary); }
.attention-word.selected { background: rgba(99, 102, 241, 0.2); border-color: var(--accent-primary); color: var(--accent-secondary); }

/* ---- Pipeline Stages (Ch 8.2) ---- */
.pipeline-stages {
    display: flex;
    align-items: center;
    gap: 4px;
    overflow-x: auto;
    padding: 16px 0;
    justify-content: center;
}

.pipeline-stage {
    padding: 12px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    text-align: center;
    min-width: 100px;
    transition: var(--transition);
}

.pipeline-stage.active {
    background: rgba(99, 102, 241, 0.15);
    border-color: var(--accent-primary);
    color: var(--accent-secondary);
}

.pipeline-arrow {
    color: var(--text-muted);
    font-size: 18px;
    flex-shrink: 0;
}

/* ---- Comparison Table ---- */
.compare-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 14px;
}

.compare-table th {
    background: var(--bg-input);
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

.compare-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
}

.compare-table tr:hover td {
    background: var(--bg-card);
}

/* ---- Completion Banner ---- */
.completion-banner {
    text-align: center;
    padding: 60px 20px;
    background: var(--bg-card);
    border: 2px solid var(--accent-primary);
    border-radius: var(--radius);
    margin: 24px 0;
}

.completion-banner .trophy { font-size: 64px; margin-bottom: 16px; }
.completion-banner h2 { font-size: 28px; font-weight: 800; margin-bottom: 8px; }
.completion-banner p { color: var(--text-secondary); font-size: 16px; }

/* ---- Sentiment Bar ---- */
.sentiment-bar-container {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 12px 0;
}

.sentiment-bar-track {
    flex: 1;
    height: 24px;
    background: var(--bg-input);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
}

.sentiment-bar-fill {
    height: 100%;
    border-radius: 12px;
    transition: width 0.5s ease;
}

/* ---- Text Input ---- */
.text-input {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 15px;
    outline: none;
    transition: var(--transition);
}

.text-input:focus { border-color: var(--accent-primary); }

/* ---- Transformer Architecture (Module 9) ---- */
.transformer-block {
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 13px;
    font-weight: 600;
    min-width: 120px;
}

.transformer-block:hover {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
}

.transformer-block.active {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.15);
    color: var(--accent-secondary);
    box-shadow: 0 0 16px rgba(99, 102, 241, 0.25);
}

.transformer-block .block-icon { font-size: 20px; margin-bottom: 4px; display: block; }

.block-detail-panel {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 20px;
    margin-top: 16px;
    min-height: 100px;
    transition: var(--transition);
}

/* ---- Tokenization Flow ---- */
.token-flow {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin: 16px 0;
    justify-content: center;
}

.token-flow .flow-arrow { color: var(--text-muted); font-size: 20px; flex-shrink: 0; }

.token-chip {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    border-radius: 20px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    font-weight: 500;
    transition: var(--transition);
    border: 1px solid transparent;
}

.token-chip.text-token { background: rgba(99, 102, 241, 0.15); color: var(--accent-secondary); border-color: rgba(99, 102, 241, 0.3); }
.token-chip.id-token { background: rgba(16, 185, 129, 0.15); color: var(--success); border-color: rgba(16, 185, 129, 0.3); }
.token-chip.vec-token { background: rgba(245, 158, 11, 0.15); color: var(--warning); border-color: rgba(245, 158, 11, 0.3); }

.wave-controls { display: flex; gap: 24px; align-items: end; margin: 16px 0; flex-wrap: wrap; }

/* ---- Q/K/V Matrices ---- */
.qkv-matrix { display: inline-flex; flex-direction: column; margin: 8px; vertical-align: middle; }
.qkv-matrix .matrix-label { text-align: center; font-size: 14px; font-weight: 700; margin-bottom: 6px; letter-spacing: 1px; }
.qkv-matrix .matrix-label.q-label { color: #6366f1; }
.qkv-matrix .matrix-label.k-label { color: #10b981; }
.qkv-matrix .matrix-label.v-label { color: #f59e0b; }

.attention-step { display: flex; align-items: center; justify-content: center; gap: 12px; margin: 16px 0; flex-wrap: wrap; }
.attention-step .step-arrow { font-size: 24px; color: var(--text-muted); }

/* ---- GPT Generation ---- */
.generation-output {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 20px;
    margin: 16px 0;
    font-size: 16px;
    line-height: 2;
    min-height: 80px;
}

.generation-output .generated-token {
    display: inline;
    padding: 2px 0;
    border-bottom: 2px solid var(--accent-primary);
    animation: tokenFadeIn 0.3s ease;
}

@keyframes tokenFadeIn {
    from { opacity: 0; background: rgba(99, 102, 241, 0.3); }
    to { opacity: 1; background: transparent; }
}

.prob-bars {
    display: flex;
    gap: 6px;
    align-items: flex-end;
    height: 120px;
    margin: 16px 0;
    padding: 12px;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
}

.prob-bar { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 4px; max-width: 60px; }
.prob-bar .bar { width: 100%; border-radius: 4px 4px 0 0; transition: height 0.3s ease; }
.prob-bar .bar-label { font-size: 10px; color: var(--text-secondary); font-family: 'JetBrains Mono', monospace; text-align: center; word-break: break-all; }

.causal-mask-grid { display: inline-grid; gap: 2px; margin: 16px auto; }

.mask-cell {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    font-weight: 600;
    transition: var(--transition);
}

.mask-cell.allowed { background: rgba(99, 102, 241, 0.2); color: var(--accent-secondary); }
.mask-cell.blocked { background: rgba(239, 68, 68, 0.1); color: rgba(239, 68, 68, 0.4); }

/* ---- ViT Patches ---- */
.patch-grid {
    display: inline-grid;
    gap: 2px;
    margin: 16px auto;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.patch-cell {
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
}

.patch-cell:hover { outline: 2px solid var(--accent-primary); z-index: 1; }
.patch-cell.highlighted { outline: 2px solid var(--accent-primary); box-shadow: 0 0 8px rgba(99, 102, 241, 0.25); }

.model-comparison { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 16px 0; }

.model-card {
    background: var(--bg-input);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.model-card:hover { border-color: var(--accent-primary); transform: translateY(-2px); }
.model-card.active { border-color: var(--accent-primary); background: rgba(99, 102, 241, 0.08); }
.model-card .model-icon { font-size: 32px; margin-bottom: 8px; }
.model-card .model-name { font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.model-card .model-desc { font-size: 12px; color: var(--text-secondary); }

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open { transform: translateX(0); }

    .sidebar-toggle { display: flex; }

    .content { margin-left: 0; padding: 20px; }
    .site-footer { margin-left: 0; padding: 16px 20px 24px; }

    .welcome-proof { grid-template-columns: 1fr; }
    .welcome-features { grid-template-columns: 1fr; }
    .roadmap-grid { grid-template-columns: 1fr; }
    .roadmap-chip { text-align: left; }
    .learning-radar-grid { grid-template-columns: 1fr; }
    .radar-canvas-wrap canvas { height: 280px; }

    .welcome-hero h1 { font-size: 32px; }
    .subtitle { font-size: 18px; }
    .welcome-outcome { font-size: 14px; }

    .draw-area { grid-template-columns: 1fr; }

    .prediction-results { grid-template-columns: repeat(5, 1fr); }

    .gd-stats { grid-template-columns: repeat(2, 1fr); }

    .matrix-equation { flex-direction: column; }

    .controls { flex-direction: column; align-items: stretch; }

    input[type="range"] { width: 100%; }

    .model-comparison { grid-template-columns: 1fr; }

    .wave-controls { flex-direction: column; }

    .attention-step { flex-direction: column; }
}

/* ============================================
   Module 10-12: Post-Transformer Visualizations
   ============================================ */

/* Scaling Metrics */
.scaling-metric {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--bg-card);
    border-radius: 8px;
    margin-bottom: 8px;
    transition: all 0.3s ease;
}

.scaling-metric:hover {
    background: var(--bg-card-hover);
    transform: translateX(4px);
}

/* Prompt Builder */
.prompt-builder {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    margin: 16px 0;
}

.shot-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 12px;
    padding: 12px;
    background: var(--bg-card);
    border-radius: 8px;
    border-left: 3px solid var(--accent-primary);
    margin-bottom: 8px;
}

/* Chain-of-Thought Steps */
.cot-step {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-card);
    border-radius: 8px;
    border-left: 4px solid transparent;
    transition: all 0.3s ease;
    margin-bottom: 8px;
}

.cot-step.active {
    border-left-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
}

.cot-step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--accent-primary);
    color: white;
    font-weight: 700;
    font-size: 13px;
    flex-shrink: 0;
}

/* Preference Cards */
.preference-pair {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin: 16px 0;
}

.response-card {
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.response-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.response-card.selected {
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.1);
}

.response-card.rejected {
    border-color: var(--error);
    opacity: 0.6;
}

/* Diffusion Timeline */
.diffusion-timeline {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 16px 0;
    overflow-x: auto;
    padding: 8px 0;
}

.diffusion-frame {
    flex-shrink: 0;
    width: 80px;
    height: 80px;
    border: 2px solid var(--border);
    border-radius: 8px;
    background: var(--bg-card);
    transition: all 0.3s ease;
}

.diffusion-frame.active {
    border-color: var(--accent-primary);
    box-shadow: 0 0 16px rgba(99, 102, 241, 0.3);
}

/* Expert Grid */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin: 16px 0;
}

.expert-box {
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    text-align: center;
    transition: all 0.3s ease;
}

.expert-box.active {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
}

.expert-box.routed {
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.1);
    animation: expertPulse 1s ease-in-out;
}

@keyframes expertPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* LoRA Comparison */
.lora-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin: 16px 0;
}

.param-matrix {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 3px;
    margin: 12px 0;
}

.param-cell {
    aspect-ratio: 1;
    border-radius: 3px;
    background: var(--bg-input);
    transition: background 0.3s ease;
}

.param-cell.updated { background: var(--accent-primary); }
.param-cell.lora-updated { background: var(--success); }

/* RAG Pipeline */
.rag-stage {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: 8px;
    margin-bottom: 8px;
    transition: all 0.3s ease;
}

.rag-stage.active {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
}

/* Agent Workflow */
.agent-loop {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin: 24px 0;
    flex-wrap: wrap;
}

.agent-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 20px;
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: 12px;
    min-width: 120px;
    transition: all 0.3s ease;
}

.agent-node.active {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
    transform: scale(1.05);
}

.tool-chip {
    padding: 8px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.tool-chip:hover {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
}

.tool-chip.selected {
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
}

/* Modality Mixer */
.modality-input-box {
    background: var(--bg-card);
    border: 2px dashed var(--border);
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.modality-input-box:hover {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.05);
}

.modality-input-box.active {
    border-style: solid;
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.1);
}

/* Final Completion Banner */
.final-completion-banner {
    text-align: center;
    padding: 60px 20px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(168, 85, 247, 0.1));
    border: 2px solid var(--accent-primary);
    border-radius: 12px;
    margin: 20px 0;
}

.completion-trophy {
    font-size: 72px;
    margin-bottom: 16px;
    animation: trophyBounce 2s ease-in-out infinite;
}

@keyframes trophyBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* ============================================
   Module 13-15: Advanced LLM Topics
   ============================================ */

/* Attention grid for FlashAttention / Sparse Attention */
.attention-grid {
    display: grid;
    gap: 2px;
    margin: 16px auto;
    max-width: 400px;
}
.attention-cell {
    aspect-ratio: 1;
    border-radius: 3px;
    transition: all 0.3s ease;
    cursor: pointer;
}

/* Memory bars for KV cache, quantization comparisons */
.memory-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 8px 0;
    padding: 10px 16px;
    background: var(--card-bg);
    border-radius: 8px;
    border: 1px solid var(--border);
}
.memory-bar-fill {
    height: 24px;
    border-radius: 6px;
    transition: width 0.6s ease;
    min-width: 4px;
}
.memory-bar-label {
    font-size: 13px;
    color: var(--text-secondary);
    min-width: 80px;
}
.memory-bar-value {
    font-weight: 600;
    font-size: 14px;
    min-width: 60px;
    text-align: right;
}

/* KV cache rows */
.kv-cache-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    margin: 4px 0;
    background: rgba(99, 102, 241, 0.08);
    border-radius: 6px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
}
.kv-cache-row.new { background: rgba(34, 197, 94, 0.15); border-left: 3px solid var(--success); }
.kv-cache-row.cached { opacity: 0.7; }

/* Thought tree nodes */
.thought-node {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: var(--card-bg);
    border: 2px solid var(--border);
    border-radius: 20px;
    font-size: 13px;
    transition: all 0.3s ease;
}
.thought-node.active { border-color: var(--accent-primary); background: rgba(99, 102, 241, 0.1); }
.thought-node.correct { border-color: var(--success); background: rgba(34, 197, 94, 0.1); }
.thought-node.wrong { border-color: var(--error); background: rgba(239, 68, 68, 0.1); }

/* Reward meter for PRM/GRPO */
.reward-meter {
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
    margin: 6px 0;
}
.reward-meter-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.5s ease;
}

/* Quantization comparison */
.quant-comparison {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 12px;
    margin: 16px 0;
}
.quant-card {
    padding: 16px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    text-align: center;
    transition: all 0.3s ease;
}
.quant-card.active { border-color: var(--accent-primary); box-shadow: 0 0 20px rgba(99, 102, 241, 0.15); }
.quant-bits { font-size: 28px; font-weight: 800; color: var(--accent-primary); }
.quant-label { font-size: 12px; color: var(--text-secondary); margin-top: 4px; }

/* GPU nodes for distributed training */
.gpu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    margin: 16px 0;
}
.gpu-node {
    padding: 16px;
    background: var(--card-bg);
    border: 2px solid var(--border);
    border-radius: 10px;
    text-align: center;
    transition: all 0.3s ease;
}
.gpu-node.active { border-color: var(--success); }
.gpu-node-label { font-size: 11px; color: var(--text-secondary); margin-top: 6px; }

/* Memory blocks for external memory */
.memory-block {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    margin: 8px 0;
    background: var(--card-bg);
    border-left: 4px solid var(--accent-primary);
    border-radius: 0 8px 8px 0;
    transition: all 0.3s ease;
}
.memory-block:hover { transform: translateX(4px); }
.memory-block-icon { font-size: 24px; }
.memory-block-title { font-weight: 600; font-size: 14px; }
.memory-block-desc { font-size: 12px; color: var(--text-secondary); }

/* Token lane for speculative decoding */
.token-lane {
    display: flex;
    gap: 4px;
    padding: 8px 12px;
    margin: 6px 0;
    background: rgba(99, 102, 241, 0.05);
    border-radius: 8px;
    overflow-x: auto;
}
.token-chip {
    display: inline-flex;
    padding: 4px 10px;
    border-radius: 14px;
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
    transition: all 0.3s ease;
}
.token-chip.draft { background: rgba(168, 85, 247, 0.2); color: #a855f7; }
.token-chip.verified { background: rgba(34, 197, 94, 0.2); color: #22c55e; }
.token-chip.rejected { background: rgba(239, 68, 68, 0.2); color: #ef4444; text-decoration: line-through; }

/* Responsive for new modules */
@media (max-width: 768px) {
    .preference-pair { grid-template-columns: 1fr; }
    .lora-comparison { grid-template-columns: 1fr; }
    .expert-grid { grid-template-columns: repeat(2, 1fr); }
    .agent-loop { flex-direction: column; }
    .completion-trophy { font-size: 56px; }
    .quant-comparison { grid-template-columns: repeat(2, 1fr); }
    .gpu-grid { grid-template-columns: repeat(2, 1fr); }
    .attention-grid { max-width: 280px; }
}