:root {
  /* surfaces */
  --plane: #0d0f13;         /* page background */
  --ink: #14171c;           /* deep panel */
  --panel: #1b1f26;
  --panel-alt: #20252d;
  --hairline: #2e333c;
  --hairline-soft: #23272f;

  /* text */
  --text-primary: #e9e7e1;
  --text-secondary: #b7bcc6;
  --text-muted: #888d97;
  --text-faint: #5c616b;

  /* safety-score scale: diverging red -> green, ordinal.
     Always shown alongside the digit + label, so color never
     carries meaning alone (dataviz relief rule). */
  --score-1: #d03b3b;       /* fragile */
  --score-2: #e8794a;       /* weak */
  --score-3: #f0b429;       /* moderate */
  --score-4: #7cb342;       /* strong */
  --score-5: #16a34a;       /* robust */

  --accent: #6ea8fe;        /* links / interactive */
  --accent-dim: #24344f;

  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --font-sans: "IBM Plex Sans", system-ui, sans-serif;

  --maxw: 1000px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--plane);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.page {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

/* ---------- top nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(13, 15, 19, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--hairline);
}
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 26px; height: 26px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--score-5), var(--accent));
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-weight: 600; font-size: 13px; color: #0d0f13;
}
.brand-name { font-size: 15px; }
.brand-name span { color: var(--text-faint); font-weight: 400; }

.nav-links { display: flex; gap: 0.4rem; align-items: center; }
.nav-links a {
  color: var(--text-muted);
  font-size: 14px;
  padding: 0.35rem 0.7rem;
  border-radius: 6px;
}
.nav-links a:hover { color: var(--text-primary); background: var(--panel); text-decoration: none; }
.nav-links a.active { color: var(--text-primary); background: var(--panel); }
.nav-links a.nav-repo { color: var(--text-faint); }

/* ---------- hero ---------- */

.hero { padding: 1rem 0 2rem; border-bottom: 1px solid var(--hairline); margin-bottom: 2rem; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}
h1 {
  font-size: 38px;
  font-weight: 600;
  margin: 0.6rem 0 0.7rem;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.dek { color: var(--text-secondary); max-width: 60ch; font-size: 17px; margin: 0 0 1.5rem; }
.dek.small { font-size: 15px; }

.stats {
  display: flex;
  gap: 2.5rem;
  padding: 1rem 0 0;
  font-family: var(--font-mono);
  flex-wrap: wrap;
}
.stat { display: flex; flex-direction: column; gap: 2px; }
.stat-value { font-size: 24px; font-weight: 500; color: var(--text-primary); }
.stat-label { font-size: 11px; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.06em; }

/* ---------- score legend ---------- */

.score-legend {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin: 0 0 1.25rem;
}
.score-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  padding: 0.3rem 0.6rem 0.3rem 0.3rem;
  border: 1px solid var(--hairline);
  border-radius: 999px;
}
.score-dot {
  width: 20px; height: 20px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 600; color: #0d0f13;
}

/* ---------- controls ---------- */

.controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}
#search {
  background: var(--panel);
  border: 1px solid var(--hairline);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 9px 12px;
  border-radius: 6px;
  min-width: 260px;
}
#search:focus { outline: none; border-color: var(--accent); }
#search::placeholder { color: var(--text-faint); }
.controls-note { font-family: var(--font-mono); font-size: 12px; color: var(--text-faint); }

/* ---------- leaderboard table ---------- */

table.board {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.board thead th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-faint);
  font-weight: 500;
  padding: 10px 12px;
  border-bottom: 1px solid var(--hairline);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}
.board thead th.no-sort { cursor: default; }
.board thead th:not(.no-sort):hover { color: var(--text-muted); }
.board thead th.num { text-align: right; }
.board thead th[aria-sort="descending"]::after { content: " \2193"; }
.board thead th[aria-sort="ascending"]::after { content: " \2191"; }

.board tbody td {
  padding: 12px;
  border-bottom: 1px solid var(--hairline-soft);
  vertical-align: middle;
}
.board tbody tr.model-row { cursor: pointer; }
.board tbody tr.model-row:hover { background: var(--panel); }
.board td.num { text-align: right; font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.rank { font-family: var(--font-mono); color: var(--text-faint); font-size: 13px; }

.model-cell { font-weight: 500; }
.model-cell .caret {
  display: inline-block;
  width: 1em;
  color: var(--text-faint);
  transition: transform 0.15s ease;
  font-family: var(--font-mono);
}
.model-row.open .caret { transform: rotate(90deg); }
.model-org { color: var(--text-faint); font-weight: 400; }

/* score badge */
.score-cell { width: 1%; white-space: nowrap; }
.score-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}
.score-num {
  width: 34px; height: 34px;
  border-radius: 8px;
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-weight: 600; font-size: 17px; color: #0d0f13;
}
.score-word { font-family: var(--font-mono); font-size: 13px; }
.score-sub { font-size: 11px; color: var(--text-faint); font-family: var(--font-mono); }

/* mini meter for ASR */
.meter { min-width: 120px; }
.meter-track {
  position: relative; height: 20px;
  background: var(--hairline-soft); border-radius: 3px; overflow: hidden;
}
.meter-fill { position: absolute; top: 0; left: 0; bottom: 0; }
.meter-label {
  position: relative; z-index: 1; height: 100%;
  display: flex; align-items: center; justify-content: flex-end;
  padding: 0 8px; font-family: var(--font-mono); font-size: 11px; font-weight: 500;
}

/* expandable detail */
tr.detail-row td { padding: 0; border-bottom: 1px solid var(--hairline-soft); background: var(--ink); }
tr.detail-row.hidden { display: none; }
.detail-wrap { padding: 0.5rem 1rem 1rem 2.6rem; }
table.detail { width: 100%; border-collapse: collapse; font-size: 13px; }
table.detail th {
  text-align: left; font-family: var(--font-mono); font-size: 10px; text-transform: uppercase;
  letter-spacing: 0.05em; color: var(--text-faint); font-weight: 500; padding: 6px 10px;
}
table.detail th.num { text-align: right; }
table.detail td { padding: 7px 10px; border-top: 1px solid var(--hairline-soft); color: var(--text-secondary); }
table.detail td.num { text-align: right; font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.eval-name { font-family: var(--font-mono); }
.scorer-tag {
  font-family: var(--font-mono); font-size: 11px;
  padding: 2px 7px; border-radius: 999px; border: 1px solid var(--hairline);
  color: var(--text-muted);
}
.scorer-tag.judge { border-color: var(--accent-dim); color: var(--accent); }
.transcript-link { font-family: var(--font-mono); font-size: 12px; white-space: nowrap; }

.loading-row td, .empty-row td {
  text-align: center; color: var(--text-faint);
  font-family: var(--font-mono); padding: 3rem 1rem;
}

/* ---------- content pages (about / methodology) ---------- */

.prose { max-width: 68ch; }
.prose h2 { font-size: 22px; font-weight: 600; margin: 2.5rem 0 0.75rem; letter-spacing: -0.01em; }
.prose h3 { font-size: 16px; font-weight: 600; margin: 1.75rem 0 0.5rem; }
.prose p { color: var(--text-secondary); margin: 0 0 1rem; }
.prose ul { color: var(--text-secondary); padding-left: 1.2rem; margin: 0 0 1rem; }
.prose li { margin: 0.35rem 0; }
.prose strong { color: var(--text-primary); }
.lead { font-size: 18px; color: var(--text-primary) !important; }

.callout {
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--accent);
  background: var(--panel);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}
.callout p { margin: 0; color: var(--text-secondary); }
.callout p + p { margin-top: 0.6rem; }

/* score-scale reference table */
.scale-table { width: 100%; border-collapse: collapse; margin: 1.25rem 0 1.5rem; font-size: 14px; }
.scale-table th {
  text-align: left; font-family: var(--font-mono); font-size: 10px; text-transform: uppercase;
  letter-spacing: 0.05em; color: var(--text-faint); font-weight: 500; padding: 8px 10px;
  border-bottom: 1px solid var(--hairline);
}
.scale-table td { padding: 10px; border-bottom: 1px solid var(--hairline-soft); color: var(--text-secondary); vertical-align: top; }
.scale-table .score-num { width: 30px; height: 30px; font-size: 15px; }

/* benchmark / step cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; margin: 1.25rem 0 1.5rem; }
.card {
  border: 1px solid var(--hairline);
  background: var(--panel);
  border-radius: 8px;
  padding: 1.1rem 1.2rem;
}
.card h3 { margin: 0 0 0.4rem; font-size: 15px; }
.card p { margin: 0; font-size: 13px; color: var(--text-muted); }
.card .tag { font-family: var(--font-mono); font-size: 11px; color: var(--text-faint); }

.steps { counter-reset: step; list-style: none; padding: 0; margin: 1.25rem 0; }
.steps li {
  position: relative; padding-left: 2.75rem; margin: 0 0 1.25rem;
  color: var(--text-secondary);
}
.steps li::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 0; top: 0;
  width: 1.9rem; height: 1.9rem; border-radius: 50%;
  background: var(--panel); border: 1px solid var(--hairline);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 13px; color: var(--text-primary);
}
.steps li strong { color: var(--text-primary); }

.page-title { font-size: 30px; font-weight: 600; margin: 0 0 0.5rem; letter-spacing: -0.02em; }

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--hairline);
  margin-top: 3rem;
}
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
  color: var(--text-faint);
  font-size: 13px;
}
.footer-inner a { color: var(--text-muted); }
.footer-col { display: flex; flex-direction: column; gap: 0.4rem; max-width: 46ch; }
.footer-col strong { color: var(--text-secondary); font-weight: 600; }

@media (max-width: 680px) {
  h1 { font-size: 30px; }
  .stats { gap: 1.5rem; }
  .board thead th.hide-sm, .board td.hide-sm { display: none; }
  .nav-links a.nav-repo { display: none; }
}