/* RETRANS-X research site — shared stylesheet.
   One palette, one type scale, one callout system. No per-page rainbows. */

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

:root {
  --bg: #0a0a0b;
  --surface: #121214;
  --surface2: #1a1a1e;
  --border: #232328;
  --text: #e4e4e7;
  --muted: #9c9ca6;
  --faint: #63636c;
  --accent: #fafafa;
  --good: #34d399;
  --bad: #f87171;
  --warn: #fbbf24;
  --info: #60a5fa;
  --serif: 'Source Serif 4', Georgia, Cambria, 'Times New Roman', serif;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', 'Cascadia Code', Consolas, monospace;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--serif);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { font-family: var(--sans); }
code, .math, .math-block { font-family: var(--mono); }

.container { max-width: 1100px; margin: 0 auto; padding: 2rem 1.5rem 3rem; }

/* ---------- masthead ---------- */
.masthead {
  display: flex; align-items: baseline; justify-content: space-between; gap: 1rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 1.25rem; margin-bottom: 1.5rem;
}
.masthead .identity .lab {
  font-family: var(--sans); font-size: 1rem; font-weight: 700;
  letter-spacing: 0.18em; text-transform: uppercase;
}
.masthead .identity .note {
  font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--muted); margin-top: 0.15rem;
}
.masthead .headline { text-align: center; flex: 1; padding: 0 1.5rem; }
.masthead .headline h1 {
  font-size: 2.1rem; font-weight: 600; letter-spacing: -0.02em; line-height: 1.25;
  margin-bottom: 0.4rem;
}
.masthead .headline .sub {
  font-size: 0.78rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted);
}
.masthead .colophon { font-family: var(--sans); text-align: right; font-size: 0.78rem; line-height: 1.5; }
.masthead .colophon .line { color: var(--muted); }
.masthead .colophon .line.strong { color: var(--accent); font-weight: 500; }

/* ---------- page nav ---------- */
.paper-header { margin-bottom: 2rem; text-align: center; }
.paper-header .authors { font-size: 0.95rem; color: var(--muted); margin-bottom: 0.5rem; }
.paper-header .affiliation, .paper-header .date { font-size: 0.8rem; color: var(--muted); margin-bottom: 0.5rem; }
.paper-nav { display: flex; gap: 0.5rem; justify-content: center; flex-wrap: wrap; margin-top: 1.25rem; }
.paper-nav a {
  color: var(--muted); text-decoration: none; font-size: 0.75rem; font-family: var(--sans);
  padding: 0.3rem 0.75rem; border: 1px solid var(--border); border-radius: 4px;
  transition: color 0.15s, border-color 0.15s;
}
.paper-nav a:hover { color: var(--accent); border-color: var(--muted); }
.paper-nav a[aria-current="page"] { color: var(--accent); border-color: var(--accent); }

/* ---------- layout with TOC ---------- */
.toc-grid { display: grid; grid-template-columns: 220px 1fr; gap: 2rem; }
.toc { position: sticky; top: 1rem; align-self: start; min-width: 0; }
.toc ol { list-style: none; margin: 0; }
.toc li { padding: 0.25rem 0; font-size: 0.8rem; }
.toc a { color: var(--muted); text-decoration: none; }
.toc a:hover, .toc a.active { color: var(--accent); }

/* ---------- sections ---------- */
.section { margin-bottom: 2.5rem; }
.section h2 {
  font-size: 1.3rem; font-weight: 600; letter-spacing: -0.01em;
  margin-bottom: 1rem; padding-bottom: 0.4rem; border-bottom: 1px solid var(--border);
}
.section h3 { font-size: 1.02rem; font-weight: 600; margin: 1.25rem 0 0.6rem; }
.section p { font-size: 0.92rem; margin-bottom: 0.75rem; line-height: 1.75; }
.note { font-size: 0.82rem; color: var(--muted); margin-bottom: 0.75rem; }
.note strong { color: var(--text); font-weight: 600; }

ul, ol { margin: 0.5rem 0 0.75rem 1.5rem; }
li { font-size: 0.9rem; margin-bottom: 0.3rem; }

/* ---------- changelog strip (was "what changed" marketing) ---------- */
.changelog {
  border: 1px solid var(--border); border-radius: 8px;
  padding: 1.25rem 1.5rem; margin-bottom: 2.5rem; background: var(--surface);
}
.changelog .kicker {
  font-family: var(--sans); font-size: 0.68rem; font-weight: 600;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted);
  margin-bottom: 0.75rem;
}
.changelog dl { display: grid; grid-template-columns: auto 1fr; gap: 0.4rem 1rem; margin: 0; }
.changelog dt { font-family: var(--mono); font-size: 0.78rem; color: var(--faint); white-space: nowrap; }
.changelog dd { font-size: 0.87rem; margin: 0; }
.changelog dd strong { font-weight: 600; }

/* ---------- figures ---------- */
.figure-container, figure.block {
  background: var(--surface); border: 1px solid var(--border); border-radius: 8px;
  padding: 1rem; margin: 1.25rem 0; text-align: center; overflow: hidden;
}
.figure-container img, figure.block img { max-width: 100%; height: auto; border-radius: 4px; display: block; margin: 0 auto; }
.figure-container .caption, figure.block figcaption { font-size: 0.8rem; color: var(--muted); margin-top: 0.6rem; text-align: left; }

/* ---------- math ---------- */
.math { font-size: 0.85em; color: var(--text); background: var(--surface2); padding: 0.1rem 0.3rem; border-radius: 3px; }
.math-block {
  font-size: 0.82rem; background: var(--surface2); color: var(--text);
  padding: 0.75rem 1rem; border-radius: 6px; margin: 0.75rem 0;
  overflow-x: auto; white-space: pre; border: 1px solid var(--border); line-height: 1.6;
}

/* ---------- cards & grids ---------- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; margin-bottom: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1.25rem; margin-bottom: 1.5rem; }
.grid-2 > *, .grid-3 > * { min-width: 0; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 1.25rem; margin-bottom: 1rem; min-width: 0; }
.card .card-title {
  font-family: var(--sans); font-size: 0.7rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--muted); margin-bottom: 0.5rem;
}
.card .value { font-family: var(--sans); font-size: 1.4rem; font-weight: 300; margin: 0.15rem 0; }
.card .value.small { font-size: 1rem; }

/* ---------- tables ---------- */
.table-scroll { overflow-x: auto; margin-bottom: 1rem; border: 1px solid var(--border); border-radius: 8px; }
.table-scroll table { margin-bottom: 0; border: none; }
table { width: 100%; border-collapse: collapse; margin-bottom: 1rem; font-variant-numeric: tabular-nums; }
th {
  text-align: left; font-family: var(--sans); font-size: 0.7rem; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted);
  padding: 0.5rem 0.75rem; border-bottom: 1px solid var(--border);
  background: var(--surface); white-space: nowrap;
}
td { padding: 0.45rem 0.75rem; border-bottom: 1px solid var(--border); font-size: 0.82rem; white-space: nowrap; }
td.wrap, th.wrap { white-space: normal; }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: rgba(255, 255, 255, 0.02); }
td .pos { color: var(--good); font-weight: 600; }
td .neg { color: var(--bad); }
td.good { color: var(--good); font-weight: 600; }
td.bad { color: var(--bad); }

/* ---------- callouts: one system, three flavors ---------- */
.callout { border: 1px solid var(--border); border-left: 3px solid var(--info); border-radius: 6px; padding: 1rem; margin-bottom: 1rem; background: var(--surface); }
.callout .title {
  font-family: var(--sans); font-size: 0.7rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.4rem; color: var(--info);
}
.callout p, .callout li { font-size: 0.87rem; }
.callout p:last-child { margin-bottom: 0; }
.callout.warn { border-left-color: var(--warn); }
.callout.warn .title { color: var(--warn); }
.callout.bad { border-left-color: var(--bad); }
.callout.bad .title { color: var(--bad); }
.callout.good { border-left-color: var(--good); }
.callout.good .title { color: var(--good); }

/* ---------- status badges ---------- */
.status-badge {
  display: inline-block; font-size: 0.6rem; font-weight: 600; letter-spacing: 0.03em;
  padding: 0.15rem 0.45rem; border-radius: 3px; border: 1px solid;
}
.status-badge.pass { background: rgba(52, 211, 153, 0.12); color: var(--good); border-color: rgba(52, 211, 153, 0.3); }
.status-badge.warn { background: rgba(251, 191, 36, 0.12); color: var(--warn); border-color: rgba(251, 191, 36, 0.3); }
.status-badge.fail { background: rgba(248, 113, 113, 0.12); color: var(--bad); border-color: rgba(248, 113, 113, 0.3); }
.status-badge.pending { background: rgba(96, 165, 250, 0.12); color: var(--info); border-color: rgba(96, 165, 250, 0.3); }

/* ---------- test report ---------- */
.test-block { background: var(--surface2); border: 1px solid var(--border); border-radius: 6px; padding: 0.75rem; margin-bottom: 0.75rem; }
.test-block .test-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.4rem; gap: 0.5rem; }
.test-block .test-name { font-size: 0.85rem; font-weight: 500; }
.test-block .test-meta { font-size: 0.7rem; color: var(--muted); }
.test-block .test-stats { display: flex; gap: 1.5rem; flex-wrap: wrap; font-size: 0.8rem; color: var(--muted); margin-top: 0.35rem; }
.log-container {
  max-height: 400px; overflow-y: auto; background: #000;
  border: 1px solid var(--border); border-radius: 6px; padding: 0.75rem;
  font-family: var(--mono); font-size: 0.72rem; line-height: 1.5;
}
.log-container .log-line { white-space: pre; color: var(--muted); }
.log-container .log-line.val { color: var(--good); font-weight: 500; }
.log-container .log-line.iter { color: var(--info); }
.log-container .log-line.warn { color: var(--warn); }

/* ---------- collapsible deep-dives ---------- */
details.deep { border: 1px solid var(--border); border-radius: 8px; background: var(--surface); margin-bottom: 1rem; }
details.deep summary {
  cursor: pointer; font-family: var(--sans); font-size: 0.95rem; font-weight: 600;
  padding: 0.9rem 1.1rem; list-style: none;
}
details.deep summary::-webkit-details-marker { display: none; }
details.deep summary::before { content: "+"; color: var(--muted); margin-right: 0.6rem; font-family: var(--mono); }
details.deep[open] summary::before { content: "–"; }
details.deep .deep-body { padding: 0 1.1rem 1.1rem; }
details.deep .deep-body ol { margin-top: 0; }

/* ---------- pending placeholder (replaces tables of dashes) ---------- */
.pending {
  border: 1px dashed var(--faint); border-radius: 8px; padding: 1.25rem;
  margin-bottom: 1rem; text-align: center; color: var(--muted); font-size: 0.87rem;
}
.pending .status-badge { margin-bottom: 0.5rem; }

/* ---------- cross-page link cards ---------- */
.page-link { text-align: center; margin: 1.5rem 0; }
.page-link a {
  display: inline-block; padding: 0.7rem 1.5rem; background: var(--surface);
  border: 1px solid var(--border); border-radius: 6px;
  color: var(--accent); text-decoration: none; font-family: var(--sans); font-weight: 500;
  transition: border-color 0.15s;
}
.page-link a:hover { border-color: var(--muted); }
.page-link a .arrow { color: var(--muted); margin-right: 0.4rem; }

.references { font-size: 0.82rem; color: var(--muted); }
.references li { margin-bottom: 0.4rem; }

footer {
  border-top: 1px solid var(--border); padding-top: 1.5rem; margin-top: 2.5rem;
  font-size: 0.75rem; color: var(--muted); text-align: center; font-family: var(--sans);
}
footer a { color: var(--muted); }
footer a:hover { color: var(--accent); }

@media (max-width: 860px) {
  .toc-grid { grid-template-columns: 1fr; gap: 1.25rem; }
  .toc { position: static; }
  .toc .card { padding: 0.75rem; }
  .toc ol { display: flex; flex-wrap: wrap; gap: 0.25rem 1rem; }
}

@media (max-width: 768px) {
  .container { padding: 1.5rem 1rem 2.5rem; }
  .masthead { flex-direction: column; align-items: center; gap: 1rem; text-align: center; }
  .masthead .identity, .masthead .colophon { text-align: center; }
  .masthead .headline { padding: 0; }
  .masthead .headline h1 { font-size: 1.6rem; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .card .value { font-size: 1.2rem; }
  .paper-nav a { font-size: 0.7rem; padding: 0.28rem 0.55rem; }
  .math-block { font-size: 0.78rem; padding: 0.65rem 0.75rem; }
  .changelog dl { grid-template-columns: 1fr; gap: 0.15rem; }
  .changelog dt { margin-top: 0.5rem; }
}