/* ============================================
   SIMULATION THEORY WEBSITE
   Dark, immersive, matrix-inspired design
   ============================================ */

/* ---------- Loading Screen ---------- */
.loading-screen {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: #0a0a0f;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.8s ease, visibility 0.8s ease;
}
.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loading-content { text-align: center; }

.loading-diamond {
    width: 60px; height: 60px;
    margin: 0 auto 2rem;
    position: relative;
    animation: diamondSpin 2s linear infinite;
}
.diamond-inner {
    width: 100%; height: 100%;
    border: 2px solid #00f0ff;
    transform: rotate(45deg);
    box-shadow: 0 0 20px rgba(0,240,255,0.3), inset 0 0 20px rgba(0,240,255,0.1);
}
@keyframes diamondSpin {
    0% { transform: rotate(0deg) scale(1); }
    25% { transform: rotate(90deg) scale(1.1); }
    50% { transform: rotate(180deg) scale(1); }
    75% { transform: rotate(270deg) scale(0.9); }
    100% { transform: rotate(360deg) scale(1); }
}

.loading-text {
    font-family: 'JetBrains Mono', monospace;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.loading-line {
    font-size: 0.7rem;
    color: #00f0ff;
    letter-spacing: 0.15em;
    opacity: 0;
    transform: translateY(5px);
    animation: lineReveal 0.5s ease forwards;
}
.loading-line:nth-child(1) { animation-delay: 0.3s; }
.loading-line:nth-child(2) { animation-delay: 0.8s; color: rgba(0,240,255,0.6); }
.loading-line:nth-child(3) { animation-delay: 1.3s; color: rgba(0,240,255,0.4); }
@keyframes lineReveal { to { opacity: 1; transform: translateY(0); } }

.loading-bar {
    width: 200px;
    height: 3px;
    background: rgba(255,255,255,0.05);
    border-radius: 2px;
    margin: 1rem auto 0;
    overflow: hidden;
}
.loading-bar-fill {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, #00f0ff, #b44aff);
    border-radius: 2px;
    animation: barFill 2s ease-in-out forwards;
    animation-delay: 0.5s;
}
@keyframes barFill { to { width: 100%; } }

/* ---------- Quiz Share Button ---------- */
.quiz-share {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-secondary);
    background: rgba(180,74,255,0.08);
    border: 1px solid var(--accent-secondary);
    padding: 0.75rem 2rem;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-left: 0.5rem;
}
.quiz-share:hover { background: rgba(180,74,255,0.15); }

/* ---------- CSS Variables ---------- */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #0f0f1a;
    --bg-card: rgba(15, 15, 30, 0.7);
    --bg-card-hover: rgba(20, 20, 40, 0.9);

    --accent-primary: #00f0ff;
    --accent-secondary: #7b2fff;
    --accent-tertiary: #ff2d7b;
    --accent-green: #00ff88;
    --accent-yellow: #ffcc00;

    --text-primary: #e8e8f0;
    --text-secondary: #8888aa;
    --text-dim: #555577;

    --glow-primary: 0 0 20px rgba(0, 240, 255, 0.3);
    --glow-secondary: 0 0 20px rgba(123, 47, 255, 0.3);
    --glow-accent: 0 0 30px rgba(0, 240, 255, 0.15);

    --border-subtle: rgba(255, 255, 255, 0.05);
    --border-glow: rgba(0, 240, 255, 0.2);

    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: rgba(0, 240, 255, 0.3);
    color: var(--accent-primary);
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: var(--transition-fast);
}

/* ---------- Matrix Rain Canvas ---------- */
#matrix-rain {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    opacity: 0.06;
    pointer-events: none;
}

/* ---------- Glitch Overlay ---------- */
.glitch-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.1s;
}

.glitch-overlay.active {
    opacity: 1;
    animation: glitchOverlay 0.5s ease-out;
}

@keyframes glitchOverlay {
    0% { background: transparent; }
    5% { background: rgba(0, 240, 255, 0.1); transform: translateX(-5px); }
    10% { background: rgba(255, 45, 123, 0.1); transform: translateX(5px); }
    15% { background: transparent; transform: translateX(-2px); }
    20% { background: rgba(123, 47, 255, 0.08); transform: translateX(2px); }
    25% { background: transparent; transform: translateX(0); }
    100% { background: transparent; }
}

/* ---------- Navigation ---------- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 2rem;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    transition: var(--transition-smooth);
}

.nav.scrolled {
    padding: 0.5rem 2rem;
    background: rgba(10, 10, 15, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--accent-primary);
    text-shadow: var(--glow-primary);
}

.nav-logo-icon {
    font-size: 1.5rem;
    animation: logoPulse 3s ease-in-out infinite;
}

@keyframes logoPulse {
    0%, 100% { opacity: 1; text-shadow: 0 0 10px var(--accent-primary); }
    50% { opacity: 0.7; text-shadow: 0 0 25px var(--accent-primary), 0 0 50px var(--accent-secondary); }
}

.nav-links {
    display: flex;
    gap: 0.25rem;
}

.nav-link {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    letter-spacing: 0.05em;
    transition: var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--accent-primary);
    background: rgba(0, 240, 255, 0.05);
}

.nav-link.active {
    color: var(--accent-primary);
    background: rgba(0, 240, 255, 0.1);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--accent-primary);
    box-shadow: 0 0 10px var(--accent-primary);
    border-radius: 10px;
}

.glitch-btn {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-tertiary);
    background: rgba(255, 45, 123, 0.1);
    border: 1px solid rgba(255, 45, 123, 0.3);
    padding: 0.5rem 1.25rem;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition-fast);
    letter-spacing: 0.1em;
}

.glitch-btn:hover {
    background: rgba(255, 45, 123, 0.2);
    box-shadow: 0 0 20px rgba(255, 45, 123, 0.3);
    transform: scale(1.05);
}

/* Music Button */
.music-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: rgba(0, 240, 255, 0.05);
    border: 1px solid rgba(0, 240, 255, 0.15);
    padding: 0.5rem 1.25rem;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition-fast);
    letter-spacing: 0.1em;
}

.music-btn:hover {
    background: rgba(0, 240, 255, 0.1);
    border-color: rgba(0, 240, 255, 0.3);
    color: var(--accent-primary);
}

.music-btn.active {
    color: var(--accent-primary);
    background: rgba(0, 240, 255, 0.12);
    border-color: var(--accent-primary);
    box-shadow: 0 0 15px rgba(0, 240, 255, 0.2);
}

.music-btn.active .music-icon {
    animation: musicPulse 1.5s ease-in-out infinite;
}

@keyframes musicPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

.music-icon {
    font-size: 1rem;
}

.music-label {
    font-size: 0.65rem;
}

/* Nav Actions Container */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Language Toggle Button */
.lang-btn {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-secondary);
    background: rgba(255, 204, 0, 0.05);
    border: 1px solid rgba(255, 204, 0, 0.15);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition-fast);
    letter-spacing: 0.1em;
}

.lang-btn:hover {
    background: rgba(255, 204, 0, 0.12);
    border-color: rgba(255, 204, 0, 0.35);
    color: var(--accent-yellow);
    box-shadow: 0 0 15px rgba(255, 204, 0, 0.15);
    transform: scale(1.05);
}

.lang-flag {
    font-size: 1rem;
    line-height: 1;
}

.lang-label {
    font-size: 0.7rem;
}

/* ---------- Hero Section ---------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    z-index: 1;
}

.hero-grid-bg {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    z-index: 0;
    animation: gridScroll 20s linear infinite;
}

@keyframes gridScroll {
    0% { transform: perspective(500px) rotateX(60deg) translateY(0); }
    100% { transform: perspective(500px) rotateX(60deg) translateY(60px); }
}

.hero-particles {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 2rem;
    max-width: 900px;
}

.hero-subtitle-top {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--accent-green);
    letter-spacing: 0.3em;
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeDown 0.8s ease-out 0.3s forwards;
}

.hero-subtitle-top::before {
    content: '▸ ';
}

@keyframes fadeDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 7vw, 5.5rem);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
}

.hero-title-line {
    display: block;
    opacity: 0;
    animation: glitchIn 1s ease-out forwards;
}

.hero-title-line:nth-child(1) {
    animation-delay: 0.5s;
    color: var(--text-primary);
    text-shadow: 0 0 40px rgba(255, 255, 255, 0.1);
}

.hero-title-line:nth-child(2) {
    animation-delay: 0.8s;
}

.hero-title-line.accent {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 30px rgba(0, 240, 255, 0.3));
}

@keyframes glitchIn {
    0% { opacity: 0; transform: translateY(30px) skewX(-5deg); filter: blur(10px); }
    50% { opacity: 0.8; transform: translateY(-5px) skewX(2deg); filter: blur(0); }
    60% { transform: translateX(-3px); }
    70% { transform: translateX(3px); }
    80% { transform: translateX(-1px); }
    100% { opacity: 1; transform: translateY(0) skewX(0); }
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 3rem;
    opacity: 0;
    animation: fadeUp 0.8s ease-out 1.2s forwards;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 3rem;
    opacity: 0;
    animation: fadeUp 0.8s ease-out 1.5s forwards;
}

.stat-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.25rem 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    backdrop-filter: blur(10px);
    transition: var(--transition-smooth);
}

.stat-card:hover {
    border-color: var(--border-glow);
    box-shadow: var(--glow-accent);
    transform: translateY(-3px);
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 900;
    color: var(--accent-primary);
    text-shadow: var(--glow-primary);
}

.stat-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-dim);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.hero-scroll-cta {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-primary);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    opacity: 0;
    animation: fadeUp 0.8s ease-out 1.8s forwards;
    transition: var(--transition-fast);
}

.hero-scroll-cta:hover {
    color: var(--text-primary);
    transform: translateY(3px);
}

.scroll-arrow {
    font-size: 1.2rem;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* ---------- Sections ---------- */
.section {
    position: relative;
    z-index: 1;
    padding: 8rem 2rem;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-green);
    letter-spacing: 0.15em;
    margin-bottom: 1rem;
    padding: 0.35rem 1rem;
    background: rgba(0, 255, 136, 0.05);
    border: 1px solid rgba(0, 255, 136, 0.15);
    border-radius: 20px;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 4vw, 3rem);
    font-weight: 800;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

.section-title .accent {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

/* ---------- Evidence Grid ---------- */
.evidence-section {
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-primary) 100%);
}

.evidence-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.evidence-card {
    position: relative;
    padding: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    backdrop-filter: blur(10px);
    transition: var(--transition-smooth);
    overflow: hidden;
    cursor: default;
}

.evidence-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-primary), transparent);
    opacity: 0;
    transition: var(--transition-smooth);
}

.evidence-card:hover {
    border-color: var(--border-glow);
    transform: translateY(-5px);
    background: var(--bg-card-hover);
}

.evidence-card:hover::before {
    opacity: 1;
}

.evidence-card-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 240, 255, 0.03) 0%, transparent 60%);
    opacity: 0;
    transition: var(--transition-slow);
    pointer-events: none;
}

.evidence-card:hover .evidence-card-glow {
    opacity: 1;
}

.evidence-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: block;
}

.evidence-number {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-dim);
    letter-spacing: 0.1em;
}

.evidence-title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.evidence-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.evidence-text strong {
    color: var(--accent-primary);
    font-weight: 600;
}

.evidence-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border-subtle);
}

.evidence-category {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--accent-secondary);
    letter-spacing: 0.1em;
    padding: 0.25rem 0.75rem;
    background: rgba(123, 47, 255, 0.1);
    border-radius: 20px;
}

.evidence-strength {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-dim);
    letter-spacing: 0.05em;
}

/* ---------- Quantum Section ---------- */
.quantum-section {
    background: var(--bg-secondary);
}

.quantum-experiment {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
}

.quantum-visual {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#double-slit-canvas {
    width: 100%;
    height: auto;
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    background: rgba(5, 5, 15, 0.8);
}

.quantum-controls {
    display: flex;
    gap: 0.75rem;
}

.quantum-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    padding: 0.75rem 1rem;
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition-fast);
    letter-spacing: 0.05em;
}

.quantum-btn:hover {
    border-color: var(--border-glow);
    color: var(--accent-primary);
}

.quantum-btn.active {
    background: rgba(0, 240, 255, 0.1);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    box-shadow: 0 0 15px rgba(0, 240, 255, 0.1);
}

.btn-icon {
    font-size: 1.1rem;
}

.quantum-explanation {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.quantum-state {
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
}

.state-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    margin-bottom: 0.75rem;
}

.state-indicator.not-observing {
    color: var(--accent-green);
}

.state-indicator.observing {
    color: var(--accent-tertiary);
}

.state-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    animation: statePulse 2s ease-in-out infinite;
}

.state-indicator.not-observing .state-dot {
    background: var(--accent-green);
    box-shadow: 0 0 10px var(--accent-green);
}

.state-indicator.observing .state-dot {
    background: var(--accent-tertiary);
    box-shadow: 0 0 10px var(--accent-tertiary);
}

@keyframes statePulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.quantum-state h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.quantum-state p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.quantum-state p strong {
    color: var(--accent-primary);
}

/* Code Block */
.quantum-code-block {
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-subtle);
}

.code-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: rgba(20, 20, 35, 0.8);
    border-bottom: 1px solid var(--border-subtle);
}

.code-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.code-dot.red { background: #ff5f57; }
.code-dot.yellow { background: #ffbd2e; }
.code-dot.green { background: #28c840; }

.code-filename {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-dim);
    margin-left: 0.5rem;
}

.quantum-code-block pre {
    padding: 1.25rem;
    background: rgba(10, 10, 20, 0.9);
    overflow-x: auto;
}

.quantum-code-block code {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.8;
}

.code-keyword { color: var(--accent-secondary); }
.code-func { color: var(--accent-primary); }
.code-prop { color: var(--accent-yellow); }
.code-comment { color: var(--text-dim); font-style: italic; }

/* ---------- Math Section ---------- */
.math-section {
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.math-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    max-width: 1100px;
    margin: 0 auto;
}

.math-card {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 1.5rem;
    align-items: center;
    padding: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    transition: var(--transition-smooth);
}

.math-card:hover {
    border-color: var(--border-glow);
    transform: translateY(-3px);
    box-shadow: var(--glow-accent);
}

.math-card.full-width {
    grid-column: 1 / -1;
    grid-template-columns: 1fr 1.5fr;
}

.math-visual canvas {
    width: 100%;
    height: auto;
    border-radius: 8px;
    background: rgba(5, 5, 15, 0.5);
}

.math-info h3 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.math-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.math-info p strong {
    color: var(--accent-primary);
}

.math-formula {
    padding: 0.75rem 1rem;
    background: rgba(10, 10, 20, 0.8);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    display: inline-block;
}

.math-formula code {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-primary);
    letter-spacing: 0.05em;
}

/* ---------- Simulation Proof Section ---------- */
.simulation-section {
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-primary) 100%);
}

.sim-block {
    max-width: 1100px;
    margin: 0 auto 3rem;
    padding: 2.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 20px;
    transition: var(--transition-smooth);
}

.sim-block:hover {
    border-color: var(--border-glow);
    box-shadow: var(--glow-accent);
}

.sim-block-header {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-subtle);
}

.sim-block-icon {
    font-size: 2.5rem;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 240, 255, 0.05);
    border: 1px solid rgba(0, 240, 255, 0.15);
    border-radius: 16px;
    flex-shrink: 0;
}

.sim-block-header h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.03em;
}

.sim-block-subtitle {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-dim);
    letter-spacing: 0.1em;
    margin-top: 0.25rem;
}

.sim-block-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    align-items: start;
}

.sim-block-text p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.sim-block-text p strong {
    color: var(--accent-primary);
    font-weight: 600;
}

.sim-quote {
    padding: 1rem 1.25rem;
    border-left: 3px solid var(--accent-secondary);
    background: rgba(123, 47, 255, 0.05);
    border-radius: 0 10px 10px 0;
    font-style: italic;
    font-size: 0.9rem;
    color: var(--text-primary);
    line-height: 1.6;
    margin-top: 0.5rem;
}

.sim-quote cite {
    display: block;
    margin-top: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-dim);
    font-style: normal;
}

/* Hamming Code Demo */
.hamming-demo {
    display: flex;
    align-items: center;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 1.25rem;
}

.hamming-panel {
    text-align: center;
}

.hamming-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-dim);
    letter-spacing: 0.1em;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
}

.hamming-bits {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 4px;
}

.hamming-bit {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.hamming-bit.bit-1 {
    background: rgba(0, 240, 255, 0.15);
    color: var(--accent-primary);
    border: 1px solid rgba(0, 240, 255, 0.3);
    box-shadow: 0 0 8px rgba(0, 240, 255, 0.15);
}

.hamming-bit.bit-0 {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-dim);
    border: 1px solid var(--border-subtle);
}

.hamming-bit.parity {
    background: rgba(123, 47, 255, 0.2);
    color: var(--accent-secondary);
    border: 1px solid rgba(123, 47, 255, 0.4);
    box-shadow: 0 0 8px rgba(123, 47, 255, 0.2);
}

.hamming-arrow {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--accent-primary);
    font-weight: 900;
    text-shadow: var(--glow-primary);
}

.hamming-info {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-dim);
    text-align: center;
    letter-spacing: 0.05em;
    line-height: 1.5;
    padding: 0.75rem;
    background: rgba(0, 240, 255, 0.03);
    border-radius: 8px;
    border: 1px solid rgba(0, 240, 255, 0.08);
}

/* Game of Life */
#gol-canvas {
    width: 100%;
    height: auto;
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    background: rgba(5, 5, 15, 0.8);
    cursor: crosshair;
}

.gol-rules {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.gol-rule {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-secondary);
    padding: 0.4rem 0.6rem;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    letter-spacing: 0.03em;
}

.gol-controls {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.gol-btn {
    flex: 1;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    padding: 0.6rem 0.75rem;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-fast);
    letter-spacing: 0.05em;
}

.gol-btn:hover {
    border-color: var(--border-glow);
    color: var(--accent-primary);
}

.gol-btn.active {
    background: rgba(0, 240, 255, 0.1);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.gol-hint {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-dim);
    text-align: center;
    margin-top: 0.5rem;
    letter-spacing: 0.05em;
}

/* ---------- Glitch / Timeline Section ---------- */
.glitch-section {
    background: var(--bg-primary);
    overflow: hidden;
}

.glitch-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline-line {
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, transparent, var(--accent-primary), var(--accent-secondary), transparent);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    display: flex;
    margin-bottom: 3rem;
}

.timeline-item:nth-child(even) {
    justify-content: flex-start;
    padding-right: calc(50% + 2rem);
}

.timeline-item:nth-child(odd) {
    justify-content: flex-end;
    padding-left: calc(50% + 2rem);
}

.timeline-dot {
    position: absolute;
    left: 50%;
    top: 1.5rem;
    width: 14px;
    height: 14px;
    background: var(--accent-primary);
    border: 3px solid var(--bg-primary);
    border-radius: 50%;
    transform: translateX(-50%);
    z-index: 2;
    box-shadow: 0 0 15px var(--accent-primary);
}

.timeline-content {
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    transition: var(--transition-smooth);
    position: relative;
}

.timeline-content:hover {
    border-color: var(--border-glow);
    transform: translateY(-3px);
    box-shadow: var(--glow-accent);
}

.timeline-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
    display: block;
}

.timeline-content h3 {
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: 0.03em;
}

.timeline-content p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.timeline-content p strong {
    color: var(--accent-primary);
}

.timeline-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--accent-tertiary);
    letter-spacing: 0.1em;
    padding: 0.2rem 0.6rem;
    background: rgba(255, 45, 123, 0.1);
    border-radius: 20px;
    border: 1px solid rgba(255, 45, 123, 0.2);
}

/* ---------- Conclusion Section ---------- */
.conclusion-section {
    position: relative;
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    padding-bottom: 6rem;
}

.conclusion-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.conclusion-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.conclusion-title {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 3.5vw, 2.5rem);
    font-weight: 800;
    margin-bottom: 2rem;
    min-height: 3.5rem;
}

.typing-text {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.typing-cursor {
    display: inline-block;
    color: var(--accent-primary);
    animation: blink 1s step-end infinite;
    -webkit-text-fill-color: var(--accent-primary);
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.conclusion-text {
    margin-bottom: 3rem;
}

.conclusion-text p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.conclusion-text strong {
    color: var(--accent-primary);
}

.conclusion-quote {
    padding: 1.5rem 2rem;
    border-left: 3px solid var(--accent-primary);
    background: rgba(0, 240, 255, 0.03);
    border-radius: 0 12px 12px 0;
    margin: 2rem 0;
    text-align: left;
    font-style: italic;
    color: var(--text-primary);
    font-size: 1.05rem;
    line-height: 1.7;
}

.conclusion-quote cite {
    display: block;
    margin-top: 0.75rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-dim);
    font-style: normal;
    letter-spacing: 0.05em;
}

/* Probability Meter */
.probability-meter {
    max-width: 600px;
    margin: 0 auto 3rem;
    padding: 1.5rem 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
}

.meter-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-secondary);
    letter-spacing: 0.1em;
}

.meter-value {
    font-weight: 700;
    color: var(--accent-primary);
    text-shadow: var(--glow-primary);
    font-size: 1rem;
}

.meter-bar {
    position: relative;
    height: 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.meter-fill {
    height: 100%;
    width: 0%;
    border-radius: 10px;
    background: linear-gradient(90deg, var(--accent-green), var(--accent-primary), var(--accent-secondary), var(--accent-tertiary));
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
    transition: width 2s cubic-bezier(0.4, 0, 0.2, 1);
}

.meter-markers {
    display: flex;
    justify-content: space-between;
    font-family: var(--font-mono);
    font-size: 0.6rem;
    color: var(--text-dim);
    margin-top: 0.5rem;
}

.meter-labels {
    display: flex;
    justify-content: space-between;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-dim);
    margin-top: 0.25rem;
}

/* Terminal */
.terminal-window {
    max-width: 600px;
    margin: 0 auto;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-subtle);
    text-align: left;
}

.terminal-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: rgba(20, 20, 35, 0.8);
    border-bottom: 1px solid var(--border-subtle);
}

.terminal-title {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-dim);
    margin-left: 0.5rem;
}

.terminal-body {
    padding: 1.25rem;
    background: rgba(5, 5, 15, 0.9);
    min-height: 200px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.8;
}

.terminal-line {
    opacity: 0;
    animation: terminalType 0.3s ease-out forwards;
}

.terminal-line .prompt {
    color: var(--accent-green);
}

.terminal-line .info {
    color: var(--text-secondary);
}

.terminal-line .warn {
    color: var(--accent-yellow);
}

.terminal-line .error {
    color: var(--accent-tertiary);
}

.terminal-line .success {
    color: var(--accent-primary);
}

@keyframes terminalType {
    from { opacity: 0; transform: translateX(-10px); }
    to { opacity: 1; transform: translateX(0); }
}

/* ---------- Footer ---------- */
.footer {
    position: relative;
    z-index: 1;
    padding: 3rem 2rem;
    background: rgba(5, 5, 10, 0.95);
    border-top: 1px solid var(--border-subtle);
    text-align: center;
}

.footer-content {
    max-width: 600px;
    margin: 0 auto;
}

.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: 1rem;
    letter-spacing: 0.15em;
}

.footer-text {
    font-size: 0.85rem;
    color: var(--text-dim);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.footer-glitch {
    display: inline-block;
    color: var(--text-dim);
    font-style: italic;
    opacity: 0.6;
    animation: footerGlitch 10s ease-in-out infinite;
}

@keyframes footerGlitch {
    0%, 95%, 100% { opacity: 0.6; transform: none; }
    96% { opacity: 1; color: var(--accent-tertiary); transform: skewX(-2deg); }
    97% { opacity: 0.3; transform: skewX(2deg); }
    98% { opacity: 1; color: var(--accent-primary); }
}

.footer-credits {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-dim);
    letter-spacing: 0.05em;
}

.footer-divider {
    margin: 0 0.75rem;
    opacity: 0.3;
}

/* ---------- Scroll Animations ---------- */
[data-animate] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

[data-animate="fade-right"] {
    transform: translateX(-30px);
}

[data-animate="fade-left"] {
    transform: translateX(30px);
}

[data-animate].visible {
    opacity: 1;
    transform: translate(0, 0);
}

/* ---------- Glitch Effect Class ---------- */
.glitch-active {
    animation: glitchText 0.4s ease-out;
}

@keyframes glitchText {
    0% { text-shadow: 2px 0 var(--accent-tertiary), -2px 0 var(--accent-primary); }
    25% { text-shadow: -2px 0 var(--accent-tertiary), 2px 0 var(--accent-primary); transform: skewX(-2deg); }
    50% { text-shadow: 1px 0 var(--accent-primary), -1px 0 var(--accent-secondary); transform: skewX(1deg); }
    75% { text-shadow: -1px 0 var(--accent-tertiary), 1px 0 var(--accent-primary); }
    100% { text-shadow: none; transform: skewX(0); }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
    .nav-links {
        display: none;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1rem;
        align-items: center;
    }

    .stat-card {
        width: 100%;
        max-width: 300px;
    }

    .quantum-experiment {
        grid-template-columns: 1fr;
    }

    .math-grid {
        grid-template-columns: 1fr;
    }

    .math-card {
        grid-template-columns: 1fr;
    }

    .math-card.full-width {
        grid-template-columns: 1fr;
    }

    .evidence-grid {
        grid-template-columns: 1fr;
    }

    .timeline-line {
        left: 20px;
    }

    .timeline-item:nth-child(even),
    .timeline-item:nth-child(odd) {
        justify-content: flex-start;
        padding-left: 3.5rem;
        padding-right: 0;
    }

    .timeline-dot {
        left: 20px;
    }
}

@media (max-width: 600px) {
    .nav {
        padding: 0.5rem 1rem;
    }

    .glitch-btn span {
        font-size: 0.65rem;
    }

    .section {
        padding: 5rem 1rem;
    }

    .hero-content {
        padding: 1.5rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .conclusion-quote {
        padding: 1rem 1.25rem;
        font-size: 0.95rem;
    }

    .terminal-body {
        font-size: 0.7rem;
    }
}

/* ---------- Fine-Tuning Section ---------- */
.finetuning-section { background: var(--bg-secondary); }

.ft-demo { max-width: 700px; margin: 0 auto; }

.ft-card {
    padding: 2.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 20px;
}

.ft-constant-display { text-align: center; margin-bottom: 2rem; }

.ft-constant-name {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-dim);
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
}

.ft-constant-value {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 900;
    color: var(--accent-primary);
    text-shadow: var(--glow-primary);
}

.ft-slider-container { margin-bottom: 2rem; }

.ft-slider {
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    border-radius: 3px;
    background: linear-gradient(90deg, #ff2d7b, rgba(255,255,255,0.1) 50%, #00f088);
    outline: none;
    cursor: pointer;
}

.ft-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--accent-primary);
    box-shadow: 0 0 15px var(--accent-primary);
    cursor: pointer;
    border: 2px solid rgba(255,255,255,0.3);
}

.ft-slider-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-dim);
}

.ft-result { text-align: center; margin-bottom: 2rem; }

.ft-status {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    padding: 0.5rem 1.25rem;
    border-radius: 20px;
    margin-bottom: 0.75rem;
}

.ft-status.stable { color: var(--accent-green); background: rgba(0,255,136,0.08); border: 1px solid rgba(0,255,136,0.2); }
.ft-status.warning { color: var(--accent-yellow); background: rgba(255,204,0,0.08); border: 1px solid rgba(255,204,0,0.2); }
.ft-status.danger { color: var(--accent-tertiary); background: rgba(255,45,123,0.08); border: 1px solid rgba(255,45,123,0.2); }
.ft-status.critical { color: #ff0000; background: rgba(255,0,0,0.1); border: 1px solid rgba(255,0,0,0.3); animation: criticalPulse 0.5s ease-in-out infinite; }

@keyframes criticalPulse { 0%,100% { opacity: 1; } 50% { opacity: 0.5; } }

.ft-status-dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: currentColor; box-shadow: 0 0 8px currentColor;
}

.ft-description { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; max-width: 500px; margin: 0 auto; }

.ft-constants-grid { display: flex; gap: 0.5rem; flex-wrap: wrap; justify-content: center; }

.ft-const-btn {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid var(--border-subtle);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-fast);
}
.ft-const-btn:hover { border-color: var(--border-glow); color: var(--accent-primary); }
.ft-const-btn.active { background: rgba(0,240,255,0.1); border-color: var(--accent-primary); color: var(--accent-primary); }

/* ---------- Scientists Section ---------- */
.scientists-section { background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%); }

.scientists-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.scientist-card {
    position: relative;
    text-align: center;
    padding: 2rem 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    transition: var(--transition-smooth);
    overflow: hidden;
}

.scientist-card:hover { border-color: var(--border-glow); transform: translateY(-5px); box-shadow: var(--glow-accent); }
.scientist-avatar { font-size: 3rem; margin-bottom: 1rem; }
.scientist-name { font-family: var(--font-display); font-size: 0.95rem; font-weight: 700; margin-bottom: 0.25rem; }
.scientist-role { font-family: var(--font-mono); font-size: 0.65rem; color: var(--text-dim); letter-spacing: 0.08em; margin-bottom: 1rem; }
.scientist-quote { 
    font-size: 0.8rem; color: var(--text-secondary); line-height: 1.5; 
    font-style: italic; padding: 0; margin: 0; border: none; 
}
.scientist-year {
    position: absolute; top: 1rem; right: 1rem;
    font-family: var(--font-display); font-size: 0.7rem; font-weight: 700;
    color: var(--accent-primary); opacity: 0.5;
}

/* ---------- Quiz Modal ---------- */
.quiz-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(5,5,15,0.92);
    backdrop-filter: blur(10px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}
.quiz-overlay.active { display: flex; }

.quiz-modal {
    position: relative;
    width: 90%;
    max-width: 560px;
    background: var(--bg-card);
    border: 1px solid var(--border-glow);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 0 60px rgba(0,240,255,0.1);
}

.quiz-close {
    position: absolute; top: 1rem; right: 1.5rem;
    font-size: 1.5rem; color: var(--text-dim); background: none; border: none;
    cursor: pointer; transition: var(--transition-fast);
}
.quiz-close:hover { color: var(--accent-tertiary); }

.quiz-header { text-align: center; margin-bottom: 2rem; }
.quiz-tag { display: inline-block; font-family: var(--font-mono); font-size: 0.7rem; color: var(--accent-green); letter-spacing: 0.1em; margin-bottom: 0.75rem; }
.quiz-title { font-family: var(--font-display); font-size: 1.5rem; font-weight: 800; margin-bottom: 1rem; }

.quiz-progress { height: 4px; background: rgba(255,255,255,0.05); border-radius: 2px; margin-bottom: 0.5rem; }
.quiz-progress-fill { height: 100%; background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary)); border-radius: 2px; transition: width 0.4s ease; width: 10%; }
.quiz-counter { font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-dim); }

.quiz-question { font-size: 1.05rem; line-height: 1.6; color: var(--text-primary); margin-bottom: 1.5rem; text-align: center; }

.quiz-options { display: flex; flex-direction: column; gap: 0.75rem; }
.quiz-option {
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--text-secondary);
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--border-subtle);
    padding: 1rem 1.25rem;
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition-fast);
    text-align: left;
}
.quiz-option:hover { border-color: var(--border-glow); color: var(--accent-primary); background: rgba(0,240,255,0.03); }
.quiz-option.selected { border-color: var(--accent-primary); color: var(--accent-primary); background: rgba(0,240,255,0.08); }

.quiz-result { text-align: center; }
.quiz-score-circle {
    width: 120px; height: 120px; border-radius: 50%;
    border: 3px solid var(--accent-primary);
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    margin: 0 auto 1.5rem;
    box-shadow: 0 0 30px rgba(0,240,255,0.15);
}
.quiz-score { font-family: var(--font-display); font-size: 2rem; font-weight: 900; color: var(--accent-primary); }
.quiz-score-label { font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-dim); }
.quiz-result h3 { font-family: var(--font-display); font-size: 1.2rem; margin-bottom: 0.5rem; }
.quiz-result p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; margin-bottom: 1.5rem; }
.quiz-restart {
    font-family: var(--font-mono); font-size: 0.8rem; font-weight: 600;
    color: var(--accent-primary); background: rgba(0,240,255,0.08);
    border: 1px solid var(--accent-primary); padding: 0.75rem 2rem;
    border-radius: 10px; cursor: pointer; transition: var(--transition-fast);
}
.quiz-restart:hover { background: rgba(0,240,255,0.15); }

.quiz-trigger {
    position: fixed; bottom: 2rem; right: 2rem; z-index: 100;
    display: flex; align-items: center; gap: 0.5rem;
    font-family: var(--font-mono); font-size: 0.75rem; font-weight: 700;
    color: var(--text-primary); background: var(--bg-card);
    border: 1px solid var(--accent-secondary); padding: 0.75rem 1.25rem;
    border-radius: 50px; cursor: pointer; transition: var(--transition-fast);
    box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    letter-spacing: 0.08em; animation: quizFloat 3s ease-in-out infinite;
}
.quiz-trigger:hover { border-color: var(--accent-primary); box-shadow: 0 0 20px rgba(0,240,255,0.2); transform: scale(1.05); }
@keyframes quizFloat { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-5px); } }
.quiz-trigger-label { font-size: 0.65rem; }

/* ---------- Matrix Decoder ---------- */
.decoder-section { background: var(--bg-primary); }
.decoder-demo { max-width: 800px; margin: 0 auto; }
.decoder-input-wrap { display: flex; gap: 0.75rem; margin-bottom: 1rem; }
.decoder-input {
    flex: 1; font-family: var(--font-mono); font-size: 0.9rem;
    color: var(--text-primary); background: var(--bg-card);
    border: 1px solid var(--border-subtle); padding: 0.85rem 1.25rem;
    border-radius: 10px; outline: none; transition: var(--transition-fast);
}
.decoder-input:focus { border-color: var(--accent-primary); box-shadow: 0 0 15px rgba(0,240,255,0.1); }
.decoder-input::placeholder { color: var(--text-dim); }
.decoder-btn {
    font-family: var(--font-mono); font-size: 0.85rem; font-weight: 700;
    color: var(--bg-primary); background: var(--accent-primary);
    border: none; padding: 0.85rem 1.5rem; border-radius: 10px;
    cursor: pointer; transition: var(--transition-fast);
    letter-spacing: 0.05em;
}
.decoder-btn:hover { box-shadow: 0 0 20px rgba(0,240,255,0.3); transform: scale(1.03); }
#decoder-canvas { width: 100%; height: auto; border-radius: 12px; border: 1px solid var(--border-subtle); }

/* ---------- Hamburger Menu ---------- */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 101;
}

.hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition-fast);
}

.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ---------- Mobile Responsive ---------- */
@media (max-width: 900px) {
    .sim-block-content { grid-template-columns: 1fr; }
    .quantum-experiment { grid-template-columns: 1fr; }
    .math-grid { grid-template-columns: 1fr; }
    .math-card { grid-template-columns: 1fr; }
    .math-card.full-width { grid-template-columns: 1fr; }
    .scientists-grid { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
}

@media (max-width: 768px) {
    .hamburger { display: flex; }
    .nav-links, .nav-actions {
        display: none;
        position: fixed;
        top: 0; left: 0; right: 0; bottom: 0;
        background: rgba(10,10,15,0.97);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 1.5rem;
        z-index: 100;
    }
    .nav-links.mobile-open, .nav-actions.mobile-open {
        display: flex;
    }
    .nav-link { font-size: 1.2rem; }

    .evidence-grid { grid-template-columns: 1fr; }
    .timeline-item:nth-child(even) { padding-right: 0; padding-left: calc(50% + 1rem); }
    .ft-constant-value { font-size: 1.4rem; }
    .scientists-grid { grid-template-columns: 1fr 1fr; }
    .decoder-input-wrap { flex-direction: column; }
    .quiz-modal { padding: 1.5rem; }
    .quiz-trigger { bottom: 1rem; right: 1rem; padding: 0.6rem 1rem; }
}

@media (max-width: 480px) {
    .scientists-grid { grid-template-columns: 1fr; }
    .gol-rules { grid-template-columns: 1fr; }
    .hero-stats { flex-direction: column; gap: 1rem; }
    .ft-constants-grid { flex-direction: column; }
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 240, 255, 0.2);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 240, 255, 0.4);
}