:root {
  --bg: #0e1116;
  --bg-elev: #161b22;
  --bg-card: #1b222c;
  --border: #2a313c;
  --text: #e6edf3;
  --text-muted: #9aa5b1;
  --accent: #f97316;
  --accent-2: #38bdf8;
  --pass: #10b981;
  --warn: #f59e0b;
  --bad: #ef4444;
  --max-w: 1180px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 20px; }

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ─────── Header ─────── */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(14, 17, 22, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 20px;
}
.brand { display: flex; align-items: center; gap: 8px; color: var(--text); font-weight: 600; }
.brand:hover { text-decoration: none; }
.brand-logo { font-size: 22px; }
.brand-name { font-size: 18px; letter-spacing: 0.2px; }
.nav { display: flex; gap: 18px; align-items: center; }
.nav a { color: var(--text-muted); font-size: 14px; }
.nav a:hover { color: var(--text); text-decoration: none; }
.nav-gh {
  border: 1px solid var(--border);
  padding: 6px 12px; border-radius: 6px;
}

/* ─────── Hero ─────── */
.hero {
  padding: 80px 0 56px;
  background: radial-gradient(900px 400px at 50% -100px, rgba(249, 115, 22, 0.18), transparent 70%);
  border-bottom: 1px solid var(--border);
  text-align: center;
}
.hero h1 {
  font-size: 48px; margin: 0 0 8px; letter-spacing: -0.5px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.tagline { font-size: 18px; color: var(--text-muted); margin: 0 0 12px; }
.authors      { font-size: 15px; color: var(--text); margin: 0 auto 4px; max-width: 820px; }
.authors-note { font-size: 12px; color: var(--text-muted); margin: 0 auto 24px; }
.abstract     { max-width: 800px; margin: 0 auto 28px; color: var(--text); font-size: 15px; }

.hero-stats { display: flex; justify-content: center; gap: 40px; margin: 24px 0 28px; flex-wrap: wrap; }
.stat { text-align: center; }
.stat-num { display: block; font-size: 32px; font-weight: 700; color: var(--accent); }
.stat-label { color: var(--text-muted); font-size: 13px; text-transform: uppercase; letter-spacing: 1px; }

.cta { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 10px 18px; border-radius: 6px;
  background: var(--bg-card); color: var(--text); border: 1px solid var(--border);
  font-size: 14px; font-weight: 500;
}
.btn:hover { text-decoration: none; background: var(--bg-elev); border-color: #3a4150; }
.btn-primary {
  background: var(--accent); color: white; border-color: var(--accent);
}
.btn-primary:hover { background: #ea660d; border-color: #ea660d; }

/* ─────── Sections ─────── */
.section { padding: 56px 20px; border-bottom: 1px solid var(--border); }
.section h2 { font-size: 28px; margin: 0 0 12px; }
.section-desc { color: var(--text-muted); margin: 0 0 24px; max-width: 800px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: start; }
@media (max-width: 800px) { .grid-2 { grid-template-columns: 1fr; } }

figure { margin: 0; }
figure img {
  max-width: 100%; height: auto; border-radius: 8px;
  background: white; padding: 12px; border: 1px solid var(--border);
}
figcaption { color: var(--text-muted); font-size: 13px; margin-top: 8px; text-align: center; }
.full-fig img { display: block; margin: 0 auto; max-width: 100%; }

/* ─────── Leaderboard ─────── */
.lb-controls {
  display: flex; align-items: center; justify-content: space-between;
  margin: 8px 0 16px; gap: 16px; flex-wrap: wrap;
}
.tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.tab {
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text-muted); padding: 7px 14px; border-radius: 6px;
  cursor: pointer; font-size: 14px;
}
.tab:hover { color: var(--text); }
.tab.active { background: var(--accent); color: white; border-color: var(--accent); }
.filters { display: flex; gap: 16px; color: var(--text-muted); font-size: 14px; }
.filters label { cursor: pointer; user-select: none; }
.filters input[type=checkbox] { accent-color: var(--accent); margin-right: 4px; }

.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: 8px; }
.leaderboard {
  width: 100%; border-collapse: collapse; font-size: 14px;
}
.leaderboard th, .leaderboard td {
  padding: 11px 14px; text-align: left;
  border-bottom: 1px solid var(--border); white-space: nowrap;
}
.leaderboard thead th {
  background: var(--bg-elev); font-weight: 600; color: var(--text-muted);
  font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px;
}
.leaderboard tbody tr:hover { background: var(--bg-elev); }
.leaderboard tbody tr:last-child td { border-bottom: none; }
.col-rank { width: 50px; color: var(--text-muted); }
.col-pass, .col-perf { font-variant-numeric: tabular-nums; font-weight: 600; }
.col-cov, .col-src { color: var(--text-muted); font-size: 13px; }
.sortable { cursor: pointer; user-select: none; }
.sortable:hover { color: var(--text); }
.sort-active { color: var(--accent) !important; }

.bar-cell { display: flex; align-items: center; gap: 8px; }
.bar { flex: 1 1 80px; max-width: 120px; height: 6px; background: var(--bg-elev); border-radius: 3px; overflow: hidden; }
.bar-fill { height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); }
.tag {
  display: inline-block; padding: 2px 8px; border-radius: 999px;
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px;
}
.tag-paper { background: rgba(56, 189, 248, 0.15); color: var(--accent-2); }
.tag-logs  { background: rgba(249, 115, 22, 0.15); color: var(--accent); }
.empty { text-align: center; color: var(--text-muted); padding: 40px 20px; }

.footnote { color: var(--text-muted); font-size: 13px; margin-top: 12px; }

/* ─────── Agents grid ─────── */
.agents {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px; margin: 24px 0;
}
.agent-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px; padding: 18px;
}
.agent-card h3 { margin: 0 0 8px; color: var(--accent); font-size: 16px; }
.agent-card p  { margin: 0; color: var(--text-muted); font-size: 14px; }

/* ─────── Citation ─────── */
.cite {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px; padding: 16px; overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  font-size: 13px;
}
.cite code { color: var(--text); }

/* ─────── Submit page ─────── */
.hero-tight { padding: 56px 0 32px; }
.submit-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px; padding: 24px;
}
.submit-card h2 { margin: 0 0 8px; font-size: 22px; }
.field { display: block; margin: 16px 0; }
.field-label { display: block; font-size: 13px; color: var(--text-muted); margin-bottom: 6px; font-weight: 500; }
.field-hint  { display: block; font-size: 12px; color: var(--text-muted); margin-top: 4px; }
.field input[type=text], .field input[type=email], .field textarea {
  width: 100%; box-sizing: border-box;
  background: var(--bg); color: var(--text);
  border: 1px solid var(--border); border-radius: 6px;
  padding: 9px 12px; font-size: 14px; font-family: inherit;
}
.field input:focus, .field textarea:focus {
  outline: none; border-color: var(--accent);
}
.field textarea { resize: vertical; min-height: 60px; }
.req { color: var(--bad); }
.checkrow { display: flex; flex-wrap: wrap; gap: 14px; }
.checkrow label { color: var(--text); font-size: 14px; cursor: pointer; user-select: none; }
.checkrow input[type=checkbox] { accent-color: var(--accent); margin-right: 4px; }

#submit-btn { margin-top: 8px; width: auto; }
.submit-result { margin-top: 12px; font-size: 14px; min-height: 20px; }
.submit-result-ok    { color: var(--pass); }
.submit-result-error { color: var(--bad); }

.submit-steps { padding-left: 22px; color: var(--text); }
.submit-steps li { margin-bottom: 14px; }
.submit-steps pre {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 6px; padding: 12px; margin: 8px 0;
  overflow-x: auto; font-size: 12px;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
}
.submit-steps code { font-size: 12.5px; }

/* ─────── Footer ─────── */
.site-footer { padding: 24px 0; color: var(--text-muted); font-size: 13px; }
.footer-row { display: flex; justify-content: space-between; padding: 0 20px; }