/* ========================================
   DESIGN SYSTEM
   ======================================== */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: rgba(255,255,255,0.03);
    --bg-card-hover: rgba(255,255,255,0.06);
    --bg-glass: rgba(255,255,255,0.04);
    --border: rgba(255,255,255,0.06);
    --border-hover: rgba(255,255,255,0.12);

    --text-primary: #f0f0f5;
    --text-secondary: #8b8b9e;
    --text-muted: #55556a;

    --accent-indigo: #6366f1;
    --accent-cyan: #06b6d4;
    --accent-emerald: #10b981;
    --accent-amber: #f59e0b;
    --accent-rose: #f43f5e;
    --accent-violet: #8b5cf6;
    --accent-sky: #38bdf8;

    --gradient-primary: linear-gradient(135deg, #6366f1, #06b6d4);
    --gradient-correct: linear-gradient(135deg, #10b981, #06b6d4);
    --gradient-wrong: linear-gradient(135deg, #f43f5e, #f97316);
    --gradient-partial: linear-gradient(135deg, #f59e0b, #f97316);
    --gradient-pending: linear-gradient(135deg, #6366f1, #8b5cf6);
    --gradient-unfalsifiable: linear-gradient(135deg, #8b5cf6, #d946ef);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);

    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   RESET & BASE
   ======================================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

a { color: var(--accent-cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
code {
    background: rgba(99, 102, 241, 0.15);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.85em;
    color: var(--accent-indigo);
}

/* ========================================
   AMBIENT BACKGROUND
   ======================================== */
.ambient-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.15;
}

.orb-1 {
    width: 600px; height: 600px;
    background: var(--accent-indigo);
    top: -200px; left: -100px;
    animation: orbFloat1 20s ease-in-out infinite;
}

.orb-2 {
    width: 500px; height: 500px;
    background: var(--accent-cyan);
    bottom: -150px; right: -100px;
    animation: orbFloat2 25s ease-in-out infinite;
}

.orb-3 {
    width: 400px; height: 400px;
    background: var(--accent-violet);
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    animation: orbFloat3 30s ease-in-out infinite;
}

@keyframes orbFloat1 {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(100px, 80px); }
}

@keyframes orbFloat2 {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(-80px, -60px); }
}

@keyframes orbFloat3 {
    0%, 100% { transform: translate(-50%, -50%) scale(1); }
    50% { transform: translate(-30%, -60%) scale(1.2); }
}

/* ========================================
   NAVIGATION
   ======================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 0 24px;
    transition: var(--transition);
    background: transparent;
}

.nav.scrolled {
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-primary);
    text-decoration: none;
}

.logo-icon { font-size: 1.4rem; }

.nav-links {
    display: flex;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
    background: rgba(255,255,255,0.06);
    text-decoration: none;
}

/* ========================================
   HERO
   ======================================== */
.hero {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 24px 60px;
}

.hero-content {
    max-width: 860px;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent-cyan);
    margin-bottom: 28px;
    letter-spacing: 0.5px;
    animation: fadeInUp 0.8s ease-out;
}

.hero-title {
    font-family: 'Playfair Display', serif;
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    animation: fadeInUp 0.8s ease-out 0.1s both;
}

.title-line { display: block; }

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

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto 40px;
    line-height: 1.7;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 40px;
    animation: fadeInUp 0.8s ease-out 0.3s both;
}

.stat-card {
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px 16px;
    transition: var(--transition);
}

.stat-card:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
    transform: translateY(-2px);
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 4px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 28px rgba(99, 102, 241, 0.4);
    text-decoration: none;
    color: white;
}

.btn-secondary {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    text-decoration: none;
    color: var(--text-primary);
}

.scroll-indicator {
    margin-top: auto;
    padding-top: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.8rem;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

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

@keyframes scrollBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(6px); }
}

/* ========================================
   SECTIONS
   ======================================== */
.section {
    position: relative;
    z-index: 1;
    padding: 100px 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.section-alt {
    background: transparent;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-title {
    font-family: 'Playfair Display', serif;
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 700;
    margin-bottom: 12px;
}

.section-desc {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   SCORE OVERVIEW
   ======================================== */
.score-overview {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 48px;
    margin-bottom: 48px;
    padding: 32px;
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}

.score-ring-container {
    position: relative;
    width: 120px;
    height: 120px;
    flex-shrink: 0;
}

.score-ring { width: 100%; height: 100%; }

.score-text {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.score-value {
    font-size: 1.8rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.score-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.score-breakdown {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.score-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.score-item strong {
    margin-left: auto;
    color: var(--text-primary);
    min-width: 20px;
    text-align: right;
}

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

.score-item.correct .score-dot { background: var(--accent-emerald); }
.score-item.partial .score-dot { background: var(--accent-amber); }
.score-item.wrong .score-dot { background: var(--accent-rose); }
.score-item.pending .score-dot { background: var(--accent-indigo); }
.score-item.unfalsifiable .score-dot { background: var(--accent-violet); }

/* ========================================
   FILTER BAR
   ======================================== */
.filter-bar {
    display: flex;
    gap: 8px;
    margin-bottom: 32px;
    flex-wrap: wrap;
    justify-content: center;
}

.filter-btn {
    padding: 8px 18px;
    border-radius: 100px;
    border: 1px solid var(--border);
    background: var(--bg-glass);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.filter-btn:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.filter-btn.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
}

/* ========================================
   PREDICTIONS CARDS
   ======================================== */
.predictions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 16px;
}

.prediction-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.prediction-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.prediction-card[data-verdict="correct"]::before { background: var(--gradient-correct); }
.prediction-card[data-verdict="wrong"]::before { background: var(--gradient-wrong); }
.prediction-card[data-verdict="partial"]::before { background: var(--gradient-partial); }
.prediction-card[data-verdict="pending"]::before { background: var(--gradient-pending); }
.prediction-card[data-verdict="unfalsifiable"]::before { background: var(--gradient-unfalsifiable); }

.prediction-card:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.prediction-card.hidden {
    display: none;
}

.card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.4;
    flex: 1;
}

.verdict-badge {
    padding: 4px 10px;
    border-radius: 100px;
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
    flex-shrink: 0;
}

.verdict-badge.correct {
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent-emerald);
}

.verdict-badge.wrong {
    background: rgba(244, 63, 94, 0.15);
    color: var(--accent-rose);
}

.verdict-badge.partial {
    background: rgba(245, 158, 11, 0.15);
    color: var(--accent-amber);
}

.verdict-badge.pending {
    background: rgba(99, 102, 241, 0.15);
    color: var(--accent-indigo);
}

.verdict-badge.unfalsifiable {
    background: rgba(139, 92, 246, 0.15);
    color: var(--accent-violet);
}

.card-quote {
    font-style: italic;
    color: var(--text-secondary);
    font-size: 0.88rem;
    line-height: 1.6;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.meta-tag {
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 500;
    background: rgba(255,255,255,0.04);
    color: var(--text-muted);
}

.meta-tag.category {
    color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.1);
}

/* ========================================
   SEARCH
   ======================================== */
.search-container {
    position: relative;
    max-width: 500px;
    margin: 0 auto 28px;
}

.search-input {
    width: 100%;
    padding: 14px 20px 14px 44px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    background: var(--bg-glass);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    outline: none;
    transition: var(--transition);
}

.search-input::placeholder { color: var(--text-muted); }

.search-input:focus {
    border-color: var(--accent-indigo);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1rem;
    pointer-events: none;
}

/* ========================================
   SERIES TABS
   ======================================== */
.series-tabs {
    display: flex;
    gap: 6px;
    margin-bottom: 32px;
    flex-wrap: wrap;
    justify-content: center;
}

.series-tab {
    padding: 8px 18px;
    border-radius: 100px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.series-tab:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.series-tab.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
}

.tab-count {
    font-weight: 700;
    opacity: 0.7;
}

/* ========================================
   LECTURES LIST
   ======================================== */
.lectures-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.lecture-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    cursor: pointer;
}

.lecture-item:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateX(4px);
}

.lecture-item.hidden { display: none; }

.lecture-number {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    min-width: 40px;
    text-align: center;
    padding: 4px 6px;
    background: rgba(255,255,255,0.03);
    border-radius: 4px;
    flex-shrink: 0;
}

.lecture-series-badge {
    padding: 4px 10px;
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.3px;
    flex-shrink: 0;
}

.lecture-series-badge.civilization {
    background: rgba(6, 182, 212, 0.1);
    color: var(--accent-cyan);
}

.lecture-series-badge.secret-history {
    background: rgba(139, 92, 246, 0.1);
    color: var(--accent-violet);
}

.lecture-series-badge.geo-strategy {
    background: rgba(244, 63, 94, 0.1);
    color: var(--accent-rose);
}

.lecture-series-badge.game-theory {
    background: rgba(245, 158, 11, 0.1);
    color: var(--accent-amber);
}

.lecture-series-badge.great-books {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-emerald);
}

.lecture-series-badge.other {
    background: rgba(255,255,255,0.05);
    color: var(--text-muted);
}

.lecture-title {
    font-size: 0.95rem;
    font-weight: 500;
    flex: 1;
}

.lecture-meta-right {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.prediction-indicator {
    font-size: 0.72rem;
    padding: 3px 8px;
    border-radius: 4px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-indigo);
    font-weight: 600;
    white-space: nowrap;
}

/* ========================================
   ABOUT GRID
   ======================================== */
.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
    margin-bottom: 40px;
}

.about-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 28px 24px;
    transition: var(--transition);
}

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

.about-icon {
    font-size: 2rem;
    margin-bottom: 14px;
}

.about-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 8px;
}

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

.disclaimer {
    padding: 20px 24px;
    background: rgba(245, 158, 11, 0.05);
    border: 1px solid rgba(245, 158, 11, 0.15);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.disclaimer strong {
    color: var(--accent-amber);
}

/* ========================================
   MODAL
   ======================================== */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    max-width: 680px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    padding: 36px;
    position: relative;
    transform: translateY(20px) scale(0.97);
    transition: var(--transition);
}

.modal-overlay.active .modal {
    transform: translateY(0) scale(1);
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--bg-glass);
    color: var(--text-secondary);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.modal-verdict {
    display: inline-block;
    margin-bottom: 16px;
}

.modal h2 {
    font-family: 'Playfair Display', serif;
    font-size: 1.5rem;
    margin-bottom: 16px;
    padding-right: 40px;
}

.modal-quote {
    font-style: italic;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    padding: 16px 20px;
    background: rgba(255,255,255,0.02);
    border-left: 3px solid var(--accent-indigo);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: 20px;
}

.modal-section {
    margin-bottom: 16px;
}

.modal-section-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.modal-section-content {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.7;
}

/* ========================================
   FOOTER
   ======================================== */
.footer {
    position: relative;
    z-index: 1;
    border-top: 1px solid var(--border);
    padding: 24px;
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ========================================
   ANIMATIONS
   ======================================== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeInUp 0.5s ease-out both;
}

/* ========================================
   SCROLLBAR
   ======================================== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.1);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.15); }

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 768px) {
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .score-overview {
        flex-direction: column;
        gap: 24px;
    }

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

    .nav-links { display: none; }

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

    .footer-inner {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }

    .lecture-series-badge { display: none; }
}