/* ============================================
   OPC Legends — Styles
   ============================================ */

:root {
    --bg: #0a0a0f;
    --bg-card: #111118;
    --bg-card-hover: #16161f;
    --bg-surface: #0e0e15;
    --border: #1e1e2e;
    --border-hover: #2a2a40;
    --text: #e4e4ef;
    --text-dim: #8888a0;
    --text-muted: #55556a;
    --accent: #6c5ce7;
    --accent-light: #a29bfe;
    --accent-glow: rgba(108, 92, 231, 0.15);
    --gold: #f0c040;
    --green: #00d68f;
    --red: #ff6b6b;
    --blue: #4ecdc4;
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --radius: 12px;
    --radius-lg: 20px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light theme */
[data-theme="light"] {
    --bg: #f8f9fa;
    --bg-card: #ffffff;
    --bg-card-hover: #f1f3f5;
    --bg-surface: #f8f9fa;
    --border: #e9ecef;
    --border-hover: #dee2e6;
    --text: #212529;
    --text-dim: #6c757d;
    --text-muted: #adb5bd;
    --accent: #6c5ce7;
    --accent-light: #a29bfe;
    --accent-glow: rgba(108, 92, 231, 0.1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---- Navigation ---- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.15rem;
}

.logo-icon {
    color: var(--accent);
    font-size: 1.3rem;
}

.accent { color: var(--accent-light); }

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-dim);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-link:hover { color: var(--text); }

.nav-github {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 6px 14px;
    border-radius: 8px;
}

.nav-github:hover {
    border-color: var(--accent);
    color: var(--accent-light);
}

.lang-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-dim);
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 0.82rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-body);
    white-space: nowrap;
}

.lang-toggle:hover {
    border-color: var(--accent);
    color: var(--accent-light);
    background: var(--accent-glow);
}

.theme-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-dim);
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 0.82rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-body);
    white-space: nowrap;
}

.theme-toggle:hover {
    border-color: var(--accent);
    color: var(--accent-light);
    background: var(--accent-glow);
}

.nav-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-menu-btn span {
    width: 22px;
    height: 2px;
    background: var(--text-dim);
    border-radius: 2px;
    transition: var(--transition);
}

/* ---- Hero ---- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 120px 24px 80px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.grid-lines {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(108, 92, 231, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(108, 92, 231, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.4;
}

.glow-1 {
    width: 600px;
    height: 600px;
    background: var(--accent);
    top: -200px;
    right: -100px;
    opacity: 0.12;
}

.glow-2 {
    width: 400px;
    height: 400px;
    background: var(--gold);
    bottom: -100px;
    left: -100px;
    opacity: 0.08;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 3px;
    color: var(--accent-light);
    background: var(--accent-glow);
    border: 1px solid rgba(108, 92, 231, 0.2);
    padding: 8px 20px;
    border-radius: 100px;
    margin-bottom: 32px;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
}

.hero-title .line { display: block; }

.gradient-text {
    background: linear-gradient(135deg, var(--accent-light), var(--gold), var(--blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-dim);
    max-width: 600px;
    margin: 0 auto 48px;
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-num {
    display: block;
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-light);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--accent);
    color: #fff;
    text-decoration: none;
    padding: 14px 32px;
    border-radius: 100px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    box-shadow: 0 0 40px rgba(108, 92, 231, 0.3);
}

.hero-cta:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
    box-shadow: 0 0 60px rgba(108, 92, 231, 0.4);
}

/* ---- Section Common ---- */
.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-tag {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 4px;
    color: var(--accent-light);
    display: block;
    margin-bottom: 12px;
}

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

.section-desc {
    color: var(--text-dim);
    font-size: 1.05rem;
    max-width: 560px;
    margin: 0 auto;
}

/* ---- Filter ---- */
.filter-section {
    padding: 100px 0 80px;
}

.filter-bar {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.filter-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-dim);
    padding: 8px 20px;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-body);
}

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

.filter-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

/* ---- Search ---- */
.search-container {
    position: relative;
    max-width: 500px;
    margin: 0 auto 32px;
}

.search-input {
    width: 100%;
    padding: 14px 20px;
    padding-right: 40px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 100px;
    color: var(--text);
    font-size: 0.95rem;
    font-family: var(--font-body);
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

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

.clear-search {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 4px;
    line-height: 1;
    transition: var(--transition);
}

.clear-search:hover {
    color: var(--text);
}

/* ---- Legend Cards ---- */
.legends-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 20px;
}

.legend-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.legend-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--gold));
    opacity: 0;
    transition: var(--transition);
}

.legend-card:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

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

.legend-card-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.legend-avatar {
    width: 64px;
    height: 64px;
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
    overflow: hidden;
}

.cartoon-avatar svg {
    width: 64px;
    height: 64px;
    border-radius: 18px;
}

.legend-info h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.legend-info .legend-role {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.legend-bio {
    font-size: 0.9rem;
    color: var(--text-dim);
    margin-bottom: 16px;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.legend-metrics {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
}

.metric {
    display: flex;
    flex-direction: column;
}

.metric-value {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1rem;
    color: var(--accent-light);
}

.metric-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.legend-tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.legend-tag {
    font-size: 0.7rem;
    padding: 4px 10px;
    border-radius: 100px;
    background: var(--accent-glow);
    color: var(--accent-light);
    border: 1px solid rgba(108, 92, 231, 0.15);
}

/* ---- Modal ---- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(8px);
    z-index: 200;
    display: none;
    align-items: flex-start;
    justify-content: center;
    padding: 80px 24px;
    overflow-y: auto;
}

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

.modal {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    max-width: 720px;
    width: 100%;
    padding: 40px;
    position: relative;
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: translateY(20px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 1.5rem;
    cursor: pointer;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--border);
    color: var(--text);
}

.modal-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 28px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.modal-avatar {
    width: 80px;
    height: 80px;
    border-radius: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    flex-shrink: 0;
    overflow: hidden;
}

.cartoon-avatar-lg svg {
    width: 80px;
    height: 80px;
    border-radius: 22px;
}

.modal-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.modal-role {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 8px;
}

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

.modal-links a {
    color: var(--accent-light);
    text-decoration: none;
    font-size: 0.8rem;
    padding: 4px 10px;
    border: 1px solid rgba(108, 92, 231, 0.2);
    border-radius: 6px;
    transition: var(--transition);
}

.modal-links a:hover {
    background: var(--accent-glow);
}

.modal-section {
    margin-bottom: 28px;
}

.modal-section h4 {
    font-family: var(--font-display);
    font-size: 0.85rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent-light);
    margin-bottom: 12px;
}

.modal-section p,
.modal-section li {
    color: var(--text-dim);
    font-size: 0.92rem;
    line-height: 1.7;
}

.modal-section ul {
    list-style: none;
    padding: 0;
}

.modal-section li {
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
}

.modal-section li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent);
}

.modal-quote {
    background: var(--bg-surface);
    border-left: 3px solid var(--accent);
    padding: 16px 20px;
    border-radius: 0 var(--radius) var(--radius) 0;
    margin: 16px 0;
    font-style: italic;
    color: var(--text-dim);
}

.modal-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 12px;
    margin-bottom: 24px;
}

.modal-metric {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px;
    text-align: center;
}

.modal-metric .val {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--accent-light);
    display: block;
}

.modal-metric .lbl {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ---- Philosophy ---- */
.philosophy-section {
    padding: 100px 0;
    background: var(--bg-surface);
}

.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 20px;
}

.philosophy-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
}

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

.phi-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.philosophy-card h3 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.philosophy-card p {
    color: var(--text-dim);
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 16px;
}

.phi-examples {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.phi-tag {
    font-size: 0.7rem;
    padding: 3px 10px;
    border-radius: 100px;
    background: rgba(240, 192, 64, 0.08);
    color: var(--gold);
    border: 1px solid rgba(240, 192, 64, 0.15);
}

/* ---- Cases ---- */
.cases-section {
    padding: 100px 0;
}

.cases-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.case-card {
    display: flex;
    align-items: center;
    gap: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px 32px;
    cursor: pointer;
    transition: var(--transition);
}

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

.case-number {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-muted);
    opacity: 0.3;
    flex-shrink: 0;
    width: 60px;
}

.case-body { flex: 1; }

.case-meta {
    display: flex;
    gap: 12px;
    margin-bottom: 8px;
}

.case-category {
    font-size: 0.75rem;
    color: var(--accent-light);
    background: var(--accent-glow);
    padding: 3px 10px;
    border-radius: 100px;
    border: 1px solid rgba(108, 92, 231, 0.15);
}

.case-revenue {
    font-size: 0.75rem;
    color: var(--green);
    background: rgba(0, 214, 143, 0.08);
    padding: 3px 10px;
    border-radius: 100px;
    border: 1px solid rgba(0, 214, 143, 0.15);
}

.case-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.case-desc {
    font-size: 0.88rem;
    color: var(--text-dim);
    line-height: 1.6;
    margin-bottom: 12px;
}

.case-tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.case-tags span {
    font-size: 0.7rem;
    padding: 3px 10px;
    border-radius: 100px;
    background: var(--bg-surface);
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.case-arrow {
    font-size: 1.5rem;
    color: var(--text-muted);
    flex-shrink: 0;
    transition: var(--transition);
}

.case-card:hover .case-arrow {
    color: var(--accent-light);
    transform: translateX(4px);
}

/* ---- Playbook ---- */
.playbook-section {
    padding: 100px 0;
    background: var(--bg-surface);
}

.playbook-timeline {
    position: relative;
    max-width: 700px;
    margin: 0 auto;
}

.playbook-timeline::before {
    content: '';
    position: absolute;
    left: 24px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--accent), var(--gold), var(--blue));
    opacity: 0.3;
}

.timeline-item {
    position: relative;
    padding-left: 64px;
    padding-bottom: 48px;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-phase {
    position: absolute;
    left: 0;
    top: 0;
    width: 48px;
    height: 48px;
    background: var(--bg-card);
    border: 2px solid var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--accent-light);
    font-weight: 600;
    z-index: 1;
}

.timeline-content h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.timeline-content p {
    color: var(--text-dim);
    font-size: 0.92rem;
    line-height: 1.7;
    margin-bottom: 14px;
}

.timeline-quote {
    background: var(--bg-card);
    border-left: 3px solid var(--gold);
    padding: 14px 18px;
    border-radius: 0 var(--radius) var(--radius) 0;
    font-style: italic;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ---- Models ---- */
.models-section {
    padding: 100px 0;
}

.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
}

.model-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    text-align: center;
    transition: var(--transition);
}

.model-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

.model-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.model-card h3 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.model-card p {
    color: var(--text-dim);
    font-size: 0.82rem;
    line-height: 1.6;
    margin-bottom: 12px;
}

.model-range {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--green);
    background: rgba(0, 214, 143, 0.08);
    padding: 4px 12px;
    border-radius: 100px;
    display: inline-block;
}

/* ---- Footer ---- */
.footer {
    padding: 60px 0 40px;
    border-top: 1px solid var(--border);
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    text-align: center;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.footer-tagline {
    color: var(--text-muted);
    font-size: 0.85rem;
    font-style: italic;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.85rem;
    transition: var(--transition);
}

.footer-links a:hover { color: var(--accent-light); }

.footer-copy {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.footer-copy a {
    color: var(--accent-light);
    text-decoration: none;
}

.footer-year { margin-top: 4px; }

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-menu-btn { display: flex; }

    .hero-stats { gap: 24px; }

    .legends-grid { grid-template-columns: 1fr; }
    .philosophy-grid { grid-template-columns: 1fr; }
    .models-grid { grid-template-columns: 1fr 1fr; }

    .case-card { flex-direction: column; align-items: flex-start; }
    .case-number { width: auto; }
    .case-arrow { display: none; }

    .modal { padding: 24px; }

    .modal-header { flex-direction: column; text-align: center; }
    .modal-links { justify-content: center; }
}

@media (max-width: 480px) {
    .models-grid { grid-template-columns: 1fr; }
    .hero-stats { flex-direction: column; gap: 16px; }
}

/* ---- Animations ---- */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}