/* CAR-bench Challenge @ IJCAI-ECAI 2026 — shared styles */

:root {
    --color-primary: #0f2e52;
    --color-primary-light: #2b6cb0;
    --color-accent: #e53e3e;
    --color-accent-hover: #c53030;
    --color-cta: #f6ad1c;
    --color-cta-hover: #e09500;
    --color-bg: #ffffff;
    --color-bg-alt: #f6f9fc;
    --color-bg-dark: #0a1628;
    --color-text: #1a202c;
    --color-text-light: #5a6878;
    --color-border: #e2e8f0;
    --color-border-strong: #cbd5e0;
    --color-code-bg: #edf2f7;
    --color-base: #3182ce;
    --color-hall: #e53e3e;
    --color-disamb: #d69e2e;
    --color-success: #38a169;
    --color-discord: #5865F2;
    --max-width: 1180px;
    --max-width-narrow: 960px;
    --section-padding: 4rem 0;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--color-text);
    line-height: 1.65;
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.container.narrow { max-width: var(--max-width-narrow); }

a { color: var(--color-primary-light); }
a:hover { color: var(--color-primary); }

code, pre {
    font-family: 'JetBrains Mono', 'SF Mono', Consolas, monospace;
}

/* ===== Navigation ===== */
nav.topbar {
    position: sticky;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
}

.topbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    gap: 1.5rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    font-size: 1.05rem;
    white-space: nowrap;
}

.brand .brand-mark {
    width: 30px;
    height: 30px;
    border-radius: 7px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.82rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.brand-sub {
    font-size: 0.72rem;
    color: var(--color-text-light);
    font-weight: 500;
    letter-spacing: 0.3px;
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    gap: 1.4rem;
    list-style: none;
    margin-left: auto;
}

.nav-links a {
    text-decoration: none;
    color: var(--color-text);
    font-size: 0.91rem;
    font-weight: 500;
    padding: 0.35rem 0;
    border-bottom: 2px solid transparent;
    transition: color 0.15s, border-color 0.15s;
}

.nav-links a:hover { color: var(--color-primary); }
.nav-links a.active { color: var(--color-primary); border-bottom-color: var(--color-accent); }

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.7rem;
}

.discord-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 8px;
    background: var(--color-discord);
    color: white;
    text-decoration: none;
    font-size: 1.05rem;
    transition: transform 0.15s, box-shadow 0.15s;
}
.discord-icon:hover { transform: translateY(-1px); color: white; box-shadow: 0 4px 12px rgba(88,101,242,0.35); }

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 1.15rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.15s;
    border: none;
    cursor: pointer;
    white-space: nowrap;
    font-family: inherit;
}

.btn-cta {
    background: var(--color-cta);
    color: #1a1a1a;
}
.btn-cta:hover { background: var(--color-cta-hover); color: #1a1a1a; transform: translateY(-1px); box-shadow: 0 6px 18px rgba(246,173,28,0.35); }

.btn-primary {
    background: var(--color-primary);
    color: white;
}
.btn-primary:hover { background: var(--color-primary-light); color: white; transform: translateY(-1px); }

.btn-accent {
    background: var(--color-accent);
    color: white;
}
.btn-accent:hover { background: var(--color-accent-hover); color: white; transform: translateY(-1px); }

.btn-outline {
    background: white;
    color: var(--color-text);
    border: 1.5px solid var(--color-border-strong);
}
.btn-outline:hover { border-color: var(--color-primary); color: var(--color-primary); }

.btn-sm { padding: 0.45rem 0.85rem; font-size: 0.82rem; }
.btn-lg { padding: 0.85rem 1.6rem; font-size: 1rem; }

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.3rem;
    cursor: pointer;
    color: var(--color-text);
}

/* ===== Announcement bar ===== */
.announce-bar {
    background: var(--color-primary);
    color: white;
    font-size: 0.85rem;
    padding: 0.55rem 0;
    text-align: center;
}
.announce-bar a { color: var(--color-cta); font-weight: 600; text-decoration: none; }
.announce-bar a:hover { text-decoration: underline; }

/* ===== Hero ===== */
.hero {
    position: relative;
    padding: 4.5rem 0 3.5rem;
    background: linear-gradient(135deg, #f6f9fc 0%, #e8eef7 100%);
    border-bottom: 1px solid var(--color-border);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 15% 30%, rgba(43,108,176,0.08) 0, transparent 40%),
        radial-gradient(circle at 85% 70%, rgba(229,62,62,0.06) 0, transparent 40%);
    pointer-events: none;
}

.hero .container { position: relative; }

.hero-badges {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.25rem;
}

.venue-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: var(--color-primary);
    color: white;
    padding: 0.35rem 0.95rem;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.4px;
    text-decoration: none;
}
.venue-badge.accent { background: var(--color-accent); }
.venue-badge.light { background: white; color: var(--color-primary); border: 1.5px solid var(--color-primary); }

.hero h1 {
    font-size: 2.6rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1.15;
    max-width: 900px;
    margin: 0 auto 1rem;
    text-align: center;
    letter-spacing: -0.02em;
}

.hero h1 em {
    color: var(--color-accent);
    font-style: normal;
    font-weight: 800;
}

.hero .subtitle {
    font-size: 1.15rem;
    color: var(--color-text-light);
    max-width: 760px;
    margin: 0 auto 2rem;
    text-align: center;
    line-height: 1.55;
}

.hero-buttons {
    display: flex;
    gap: 0.8rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Hero logo strip */
.hero-logos {
    margin-top: 2.2rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(0,0,0,0.07);
}
.hero-logos-label {
    display: block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--color-text-light);
    font-weight: 600;
    margin-bottom: 0.9rem;
}
.hero-logos-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.6rem;
    flex-wrap: wrap;
}
.hero-logo {
    opacity: 0.85;
    transition: opacity 0.15s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    font-size: 1.05rem;
    font-weight: 600;
    color: #718096;
}
.hero-logo:hover { opacity: 1; color: #4a5568; }
.hero-logo-sep {
    width: 1px;
    height: 20px;
    background: var(--color-border-strong);
    flex-shrink: 0;
}
@media (max-width: 700px) {
    .hero-logos-row { gap: 1rem 1.3rem; }
    .hero-logo-sep { display: none; }
}

/* Countdown */
.countdown {
    display: inline-block;
    position: relative;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 0.8rem 2.4rem 0.8rem 1.1rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    text-align: center;
    margin-top: 1.8rem;
}

.countdown-close {
    position: absolute;
    top: 0.35rem;
    right: 0.45rem;
    background: none;
    border: none;
    font-size: 1.15rem;
    color: var(--color-text-light);
    cursor: pointer;
    line-height: 1;
    padding: 0.15rem 0.35rem;
    border-radius: 4px;
    transition: background 0.15s, color 0.15s;
}
.countdown-close:hover { background: var(--color-bg-alt); color: var(--color-text); }

.countdown-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--color-text-light);
    font-weight: 600;
    margin-bottom: 0.2rem;
}
.countdown-event {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.35rem;
}
.countdown-timer {
    display: flex;
    justify-content: center;
    gap: 0.4rem;
    font-variant-numeric: tabular-nums;
}
.countdown-unit {
    background: var(--color-bg-alt);
    border-radius: 6px;
    padding: 0.25rem 0.45rem;
    min-width: 38px;
}
.countdown-unit .num {
    display: block;
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
}
.countdown-unit .lbl {
    display: block;
    font-size: 0.6rem;
    color: var(--color-text-light);
    text-transform: uppercase;
    margin-top: 2px;
}


/* ===== Sections ===== */
section { padding: var(--section-padding); }

.section-alt { background: var(--color-bg-alt); }

.section-title {
    font-size: 1.9rem;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 0.6rem;
    text-align: center;
    letter-spacing: -0.01em;
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-light);
    max-width: 720px;
    margin: 0 auto 2.5rem;
    font-size: 1.02rem;
}

.eyebrow {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    font-weight: 700;
    color: var(--color-accent);
    text-align: center;
    margin-bottom: 0.6rem;
}

/* Announcements strip */
.announcements {
    max-width: var(--max-width-narrow);
    margin: 0 auto;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 1.25rem 1.5rem;
}

.announcements h3 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-text-light);
    margin-bottom: 0.8rem;
    font-weight: 700;
}

.announce-item {
    display: flex;
    gap: 0.9rem;
    padding: 0.5rem 0;
    border-top: 1px solid var(--color-border);
    font-size: 0.93rem;
    line-height: 1.5;
}
.announce-item:first-of-type { border-top: none; padding-top: 0; }

.announce-date {
    flex-shrink: 0;
    width: 95px;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.4px;
    padding-top: 0.1rem;
}

/* Prose */
.prose { max-width: 760px; margin: 0 auto; font-size: 1.02rem; line-height: 1.75; }
.prose p { margin-bottom: 1.1rem; color: var(--color-text); }
.prose p strong { color: var(--color-primary); }
.prose h3 { font-size: 1.25rem; color: var(--color-primary); margin: 2rem 0 0.8rem; }
.prose ul, .prose ol { margin: 0.5rem 0 1.1rem 1.4rem; }
.prose li { margin-bottom: 0.4rem; }
.prose a { text-decoration: underline; text-decoration-color: rgba(43,108,176,0.3); text-underline-offset: 3px; }

/* Tracks cards */
.tracks-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    max-width: var(--max-width-narrow);
    margin: 0 auto;
}

.track-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 14px;
    padding: 1.8rem;
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
    position: relative;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}
.track-card:hover { transform: translateY(-3px); box-shadow: 0 12px 30px rgba(15,46,82,0.08); }

.track-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 5px;
}
.track-card.open::before { background: linear-gradient(90deg, #2b6cb0, #3182ce); }
.track-card.cerebras::before { background: linear-gradient(90deg, #e53e3e, #f6ad1c); }

.track-icon {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.3rem;
}
.track-card.open .track-icon { background: #2b6cb0; }
.track-card.cerebras .track-icon { background: #e53e3e; }

.track-card h3 { font-size: 1.2rem; color: var(--color-primary); font-weight: 700; }
.track-card .track-pitch { font-size: 0.96rem; color: var(--color-text-light); line-height: 1.6; }
.track-card .track-link {
    margin-top: auto;
    padding-top: 0.5rem;
    color: var(--color-primary-light);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
}
.track-card .track-link:hover { color: var(--color-primary); }

@media (max-width: 820px) {
    .tracks-grid { grid-template-columns: 1fr; }
}

/* Comparison table */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    overflow: hidden;
}
.comparison-table th, .comparison-table td {
    padding: 0.95rem 1.1rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    vertical-align: top;
    font-size: 0.95rem;
}
.comparison-table thead th {
    background: var(--color-primary);
    color: white;
    font-weight: 700;
    font-size: 0.88rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.comparison-table tbody th {
    font-weight: 600;
    color: var(--color-text-light);
    background: var(--color-bg-alt);
    font-size: 0.83rem;
    text-transform: uppercase;
    letter-spacing: 0.3px;
    width: 22%;
}

/* Baseline table */
.baseline-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    font-size: 0.92rem;
}
.baseline-table th, .baseline-table td {
    padding: 0.7rem 1rem;
    border-bottom: 1px solid var(--color-border);
    text-align: left;
    white-space: nowrap;
}
.baseline-table thead th {
    background: var(--color-primary);
    color: white;
    font-weight: 600;
    font-size: 0.83rem;
    text-align: left;
}
.baseline-table thead th.num { text-align: right; }
.baseline-table td.num { text-align: right; font-variant-numeric: tabular-nums; }
.baseline-table tbody tr:hover { background: var(--color-bg-alt); }
.baseline-table .highlight { color: var(--color-accent); font-weight: 700; }

.table-wrapper {
    overflow-x: auto;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    background: white;
}

/* Sponsor section */
.sponsor-tier {
    margin-bottom: 2.2rem;
}

.sponsor-tier-label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--color-text-light);
    text-align: center;
    margin-bottom: 1rem;
    font-weight: 700;
}

.sponsor-logos {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 2.5rem;
}

.sponsor-logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 1.5rem;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    color: var(--color-primary);
    font-weight: 700;
    font-size: 1.1rem;
    text-decoration: none;
    min-width: 170px;
    min-height: 70px;
    text-align: center;
    transition: transform 0.15s, box-shadow 0.15s;
}
.sponsor-logo:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(0,0,0,0.07); }

.sponsor-logo.platinum { font-size: 1.3rem; min-width: 220px; min-height: 90px; }
.sponsor-logo.academic { font-size: 0.95rem; min-width: 150px; min-height: 60px; }

/* Citation block */
.citation-box {
    max-width: var(--max-width-narrow);
    margin: 0 auto;
    background: var(--color-bg-dark);
    color: #e2e8f0;
    border-radius: 12px;
    padding: 1.3rem 1.5rem;
    position: relative;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
    line-height: 1.55;
    overflow-x: auto;
}
.citation-box pre { white-space: pre; }
.copy-btn {
    position: absolute;
    top: 0.7rem;
    right: 0.7rem;
    background: rgba(255,255,255,0.1);
    color: white;
    border: 1px solid rgba(255,255,255,0.2);
    padding: 0.4rem 0.75rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 600;
    font-family: inherit;
    transition: background 0.15s;
}
.copy-btn:hover { background: rgba(255,255,255,0.2); }

/* Footer */
footer.site-footer {
    background: var(--color-bg-dark);
    color: #cbd5e0;
    padding: 3rem 0 1.5rem;
    margin-top: 3rem;
}

footer.site-footer a { color: #cbd5e0; text-decoration: none; }
footer.site-footer a:hover { color: white; text-decoration: underline; }

.footer-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr 1fr;
    gap: 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-col h4 {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: white;
    margin-bottom: 0.9rem;
    font-weight: 700;
}

.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 0.4rem; font-size: 0.9rem; }

.footer-about { font-size: 0.9rem; line-height: 1.6; color: #a0aec0; }
.footer-about strong { color: white; }

.footer-contact {
    margin-top: 0.8rem;
    font-size: 0.85rem;
}
.footer-contact a { color: var(--color-cta); font-weight: 600; }

.footer-bottom {
    padding-top: 1.3rem;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 0.82rem;
    color: #718096;
}

.footer-bottom-links { display: flex; gap: 1.2rem; }

@media (max-width: 800px) {
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
    .footer-grid { grid-template-columns: 1fr; }
}

/* Page header (non-home pages) */
.page-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, #1a365d 100%);
    color: white;
    padding: 3rem 0 2.6rem;
    text-align: center;
}
.page-header h1 {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -0.01em;
    margin-bottom: 0.5rem;
}
.page-header p {
    font-size: 1.05rem;
    color: rgba(255,255,255,0.85);
    max-width: 720px;
    margin: 0 auto;
}

/* Organizer cards */
.org-group-label {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--color-accent);
    text-align: center;
    margin: 2.5rem 0 1.5rem;
    font-weight: 700;
}

.org-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
    gap: 1.3rem;
    max-width: var(--max-width-narrow);
    margin: 0 auto;
}

.org-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 1.4rem 1.3rem;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    transition: transform 0.2s, box-shadow 0.2s;
}
.org-card:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(15,46,82,0.08); }

.org-avatar {
    width: 78px;
    height: 78px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: white;
    font-size: 1.8rem;
    font-weight: 800;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.3rem;
    object-fit: cover;
}

.org-name {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.3;
}
.org-name a { color: var(--color-primary); text-decoration: none; }
.org-name a:hover { text-decoration: underline; }

.org-title {
    font-size: 0.85rem;
    color: var(--color-text-light);
    line-height: 1.4;
}

.org-bio {
    font-size: 0.87rem;
    color: var(--color-text);
    line-height: 1.5;
    margin-top: 0.3rem;
}

.org-tag {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.2rem 0.55rem;
    border-radius: 999px;
    margin-bottom: 0.25rem;
    width: fit-content;
    color: var(--color-primary);
    background: rgba(37, 99, 235, 0.08);
}
.org-tag.advisor  { color: #7c3aed; background: rgba(124, 58, 237, 0.08); }
.org-tag.industry { color: #059669; background: rgba(5, 150, 105, 0.08); }
.org-tag.researcher { color: #d97706; background: rgba(217, 119, 6, 0.08); }

.org-links {
    display: flex;
    gap: 0.6rem;
    margin-top: 0.3rem;
}
.org-links a {
    color: var(--color-text-light);
    font-size: 1rem;
    transition: color 0.15s;
}
.org-links a:hover { color: var(--color-primary); }

/* Quickstart steps */
.steps { counter-reset: step-counter; margin-top: 1.5rem; }
.step {
    counter-increment: step-counter;
    display: flex;
    gap: 1.1rem;
    padding: 1.3rem 0;
    border-top: 1px solid var(--color-border);
}
.step:first-child { border-top: none; padding-top: 0; }

.step::before {
    content: counter(step-counter);
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-primary);
    color: white;
    font-weight: 700;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.step-body { flex: 1; min-width: 0; }
.step-body h4 { font-size: 1.05rem; color: var(--color-primary); margin-bottom: 0.3rem; font-weight: 700; }
.step-body p { margin-bottom: 0.6rem; color: var(--color-text-light); font-size: 0.95rem; }

.code-block {
    background: var(--color-bg-dark);
    color: #e2e8f0;
    padding: 0.85rem 1.1rem;
    border-radius: 8px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    overflow-x: auto;
    margin: 0.5rem 0;
}
.code-block .comment { color: #718096; }

/* Timeline */
.timeline-list {
    max-width: 780px;
    margin: 0 auto;
    position: relative;
    padding-left: 2.5rem;
}
.timeline-list::before {
    content: '';
    position: absolute;
    left: 0.9rem;
    top: 0.8rem;
    bottom: 0.8rem;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    padding: 1.1rem 0;
}
.timeline-item::before {
    content: '';
    position: absolute;
    left: -2rem;
    top: 1.5rem;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--color-primary);
    border: 3px solid white;
    box-shadow: 0 0 0 2px var(--color-primary);
}
.timeline-item.upcoming::before { background: var(--color-accent); box-shadow: 0 0 0 2px var(--color-accent); }
.timeline-item.done::before { background: var(--color-success); box-shadow: 0 0 0 2px var(--color-success); }

.timeline-date {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-accent);
    letter-spacing: 0.3px;
}
.timeline-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-top: 0.25rem;
}
.timeline-desc {
    font-size: 0.93rem;
    color: var(--color-text-light);
    margin-top: 0.3rem;
    line-height: 1.5;
}
.timeline-note {
    display: inline-block;
    margin-top: 0.4rem;
    padding: 0.15rem 0.55rem;
    background: var(--color-bg-alt);
    color: var(--color-text-light);
    border-radius: 4px;
    font-size: 0.8rem;
}

/* FAQ */
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    margin-bottom: 0.8rem;
    overflow: hidden;
}
.faq-q {
    padding: 1rem 1.2rem;
    font-weight: 600;
    color: var(--color-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    font-size: 0.98rem;
    list-style: none;
}
.faq-q::-webkit-details-marker { display: none; }
.faq-q::after {
    content: '+';
    font-size: 1.4rem;
    color: var(--color-text-light);
    font-weight: 300;
    transition: transform 0.2s;
}
details[open] .faq-q::after { content: '–'; }

.faq-a {
    padding: 0 1.2rem 1.1rem;
    color: var(--color-text);
    font-size: 0.94rem;
    line-height: 1.6;
}
.faq-a p { margin-bottom: 0.6rem; }
.faq-a p:last-child { margin-bottom: 0; }

/* Rules */
.rules-toc {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 1.1rem 1.3rem;
    max-width: 760px;
    margin: 0 auto 2.5rem;
}
.rules-toc h3 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-text-light);
    margin-bottom: 0.7rem;
    font-weight: 700;
}
.rules-toc ol { columns: 2; column-gap: 2rem; margin-left: 1.2rem; font-size: 0.9rem; }
.rules-toc li { margin-bottom: 0.25rem; }
.rules-toc a { color: var(--color-primary-light); text-decoration: none; }
.rules-toc a:hover { text-decoration: underline; }

@media (max-width: 640px) { .rules-toc ol { columns: 1; } }

.rule-section {
    max-width: 760px;
    margin: 0 auto 2.5rem;
}
.rule-section h2 {
    font-size: 1.3rem;
    color: var(--color-primary);
    margin-bottom: 0.8rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-accent);
    font-weight: 700;
}
.rule-section h3 {
    font-size: 1.05rem;
    color: var(--color-primary);
    margin: 1.3rem 0 0.5rem;
    font-weight: 600;
}
.rule-section p, .rule-section li {
    color: var(--color-text);
    font-size: 0.97rem;
    line-height: 1.68;
}
.rule-section p { margin-bottom: 0.9rem; }
.rule-section ul, .rule-section ol { margin: 0.4rem 0 1rem 1.4rem; }
.rule-section li { margin-bottom: 0.35rem; }

/* Leaderboard */
.leaderboard-tabs {
    display: flex;
    gap: 0.4rem;
    justify-content: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}
.lb-tab {
    background: white;
    border: 1px solid var(--color-border-strong);
    padding: 0.5rem 1.1rem;
    border-radius: 20px;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--color-text-light);
    cursor: pointer;
    font-family: inherit;
}
.lb-tab.active { background: var(--color-primary); color: white; border-color: var(--color-primary); }

.lb-panel { display: none; }
.lb-panel.active { display: block; }

.lb-note {
    max-width: 760px;
    margin: 0 auto 1.5rem;
    padding: 0.9rem 1.1rem;
    background: #fff8e1;
    border-left: 4px solid var(--color-cta);
    border-radius: 6px;
    font-size: 0.9rem;
    color: var(--color-text);
}

.rank-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    font-size: 0.78rem;
    font-weight: 700;
}
.rank-1 { background: #fefcbf; color: #975a16; }
.rank-2 { background: #e2e8f0; color: #4a5568; }
.rank-3 { background: #feebc8; color: #9c4221; }

.baseline-row { background: #f7fafc !important; border-left: 3px solid var(--color-border-strong); }
.baseline-row td { color: var(--color-text-light); }
.baseline-row td:first-child { font-style: italic; font-size: 0.82rem; }

/* Figures */
.figure-container {
    text-align: center;
    margin: 1.5rem auto;
    max-width: 900px;
}

.figure-container img {
    max-width: 100%;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.figure-container figcaption {
    margin-top: 0.8rem;
    font-size: 0.88rem;
    color: var(--color-text-light);
    line-height: 1.5;
}

/* Utility */
.text-center { text-align: center; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-2 { margin-bottom: 2rem; }

.callout {
    background: #ebf5ff;
    border-left: 4px solid var(--color-primary-light);
    border-radius: 6px;
    padding: 0.9rem 1.1rem;
    margin: 1.2rem 0;
    font-size: 0.93rem;
    color: var(--color-text);
}
.callout.warning { background: #fffaf0; border-left-color: var(--color-cta); }
.callout.danger { background: #fff5f5; border-left-color: var(--color-accent); }

.tag {
    display: inline-block;
    padding: 0.15rem 0.55rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.2px;
    text-transform: uppercase;
}
.tag-base { background: #e6f2ff; color: #2b6cb0; }
.tag-hall { background: #fff0f0; color: #c53030; }
.tag-disamb { background: #fff8e1; color: #975a16; }
.tag-prop { background: #edf2f7; color: #4a5568; }
.tag-open { background: #e6fffa; color: #234e52; }

/* Mobile nav */
@media (max-width: 900px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0; right: 0;
        background: white;
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        gap: 0;
        padding: 0.8rem 1.5rem;
    }
    .nav-links.open { display: flex; }
    .nav-links li {
        width: 100%;
        padding: 0.6rem 0;
        border-top: 1px solid var(--color-border);
    }
    .nav-links li:first-child { border-top: none; }
    .mobile-toggle { display: block; }
    .hero h1 { font-size: 2rem; }
    .section-title { font-size: 1.6rem; }
    .comparison-table thead th,
    .comparison-table tbody th,
    .comparison-table td { font-size: 0.85rem; padding: 0.7rem 0.8rem; }
}

@media (max-width: 520px) {
    .hero { padding: 3rem 0 2.5rem; }
    .hero h1 { font-size: 1.7rem; }
    .hero .subtitle { font-size: 1rem; }
    .nav-actions .btn-cta span { display: none; }
}