/* =========================================================
   The Lab Index
   Warm minimal: serif headings, mono labels, clean sans body,
   hairline rules, one restrained accent. Light + dark aware.
   ========================================================= */

:root {
  --bg: #f7f5ef;
  --text: #1c1b17;
  --muted: #605e56;
  --faint: #98958a;
  --rule: #ddd9cd;
  --accent: #0f6f66;
  --accent-ink: #0b544d;

  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, "Cascadia Code", "Roboto Mono", monospace;

  --measure: 720px;

  --s-1: clamp(0.78rem, 0.75rem + 0.15vw, 0.85rem);
  --s0:  clamp(1rem, 0.97rem + 0.15vw, 1.08rem);
  --s1:  clamp(1.15rem, 1.05rem + 0.4vw, 1.3rem);
  --s2:  clamp(1.5rem, 1.3rem + 0.9vw, 2rem);
  --s3:  clamp(2.1rem, 1.7rem + 1.8vw, 3.2rem);
  --s4:  clamp(2.6rem, 1.9rem + 3vw, 4.4rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14140f;
    --text: #ece8dd;
    --muted: #a5a196;
    --faint: #6f6c61;
    --rule: #2b2a23;
    --accent: #74d3c8;
    --accent-ink: #8fe0d6;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: var(--s0);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--measure); margin: 0 auto; padding-inline: clamp(1.25rem, 5vw, 2rem); }

a { color: var(--accent-ink); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--accent); }

/* ---------- top bar ---------- */
.topbar { border-bottom: 1px solid var(--rule); }
.topbar-inner {
  max-width: var(--measure); margin: 0 auto;
  padding: 1.1rem clamp(1.25rem, 5vw, 2rem);
  display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
}
.brand { font-family: var(--mono); font-size: var(--s-1); letter-spacing: 0.06em; text-transform: uppercase; color: var(--text); text-decoration: none; }
.brand:hover { color: var(--accent); }
.topnav { display: flex; gap: 1.1rem; flex-wrap: wrap; }
.topnav a { font-family: var(--mono); font-size: var(--s-1); color: var(--muted); text-decoration: none; }
.topnav a:hover, .topnav a.active { color: var(--text); }

/* ---------- hero (home) ---------- */
.hero { padding: clamp(2.5rem, 7vw, 4rem) 0 clamp(1rem, 3vw, 1.6rem); }
.kicker { display: block; font-family: var(--mono); font-size: var(--s-1); letter-spacing: 0.14em; text-transform: uppercase; color: var(--faint); margin-bottom: 1.4rem; }
h1 {
  font-family: var(--serif); font-weight: 500;
  font-size: var(--s4); line-height: 1.04; letter-spacing: -0.01em;
  margin: 0 0 1.2rem; max-width: 16ch;
}
h1 em { font-style: italic; color: var(--accent); }
.lede { font-size: var(--s1); color: var(--muted); max-width: 58ch; margin: 0 0 2.4rem; }

/* ---------- labels ---------- */
.section-label,
.block-label {
  font-family: var(--mono); font-size: var(--s-1); letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--faint);
  border-top: 1px solid var(--rule);
  padding: clamp(1.5rem, 3.5vw, 2.2rem) 0 0.4rem;
  margin-top: clamp(1.5rem, 3.5vw, 2.2rem);
}
.block-label { margin-bottom: 0.4rem; }

/* ---------- index list (home + hubs) ---------- */
.index { list-style: none; margin: 0; padding: 0; }
.index li { border-bottom: 1px solid var(--rule); }
.index a {
  display: grid; grid-template-columns: 2.4rem 1fr auto; gap: 1rem; align-items: baseline;
  padding: 1.3rem 0; text-decoration: none; color: var(--text);
}
.index a:hover { color: var(--accent); }
.index a:hover .idx-desc { color: var(--muted); }
.index .idx-num { font-family: var(--mono); font-size: var(--s-1); color: var(--faint); }
.index .idx-name { font-family: var(--serif); font-size: var(--s2); font-weight: 500; line-height: 1.15; }
.index .idx-desc { display: block; font-size: var(--s0); color: var(--muted); margin-top: 0.35rem; max-width: 52ch; font-family: var(--sans); }
.index .idx-arrow { font-family: var(--mono); color: var(--faint); align-self: center; }
.index a:hover .idx-arrow { color: var(--accent); }
.index .soon .idx-name { color: var(--faint); }
.index .badge { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--faint); border: 1px solid var(--rule); border-radius: 2px; padding: 0.1rem 0.4rem; margin-left: 0.6rem; vertical-align: middle; }

/* ---------- breadcrumbs ---------- */
.crumbs { font-family: var(--mono); font-size: var(--s-1); color: var(--faint); padding: 1.6rem 0 0; margin: 0; }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--accent); }
.crumbs .sep { margin: 0 0.5rem; }

/* ---------- page head ---------- */
.page-head { padding: clamp(1.5rem, 4vw, 2.5rem) 0 clamp(1.2rem, 3vw, 2rem); }
.page-head h1 { font-size: var(--s3); margin-bottom: 0.6rem; }
.page-lede { margin: 0; color: var(--muted); font-size: var(--s0); max-width: 58ch; }

/* ---------- topics: title only ---------- */
.topics { margin: 0; }
.topic { padding: 0.85rem 0; border-bottom: 1px solid var(--rule); }
.topic h3 { font-family: var(--serif); font-weight: 500; font-size: var(--s1); margin: 0; }

/* ---------- notes: term plus short description ---------- */
.notes { margin: 0; }
.note { padding: 1.1rem 0; border-bottom: 1px solid var(--rule); }
.note h3 { font-family: var(--serif); font-weight: 500; font-size: var(--s1); margin: 0 0 0.3rem; }
.note p { margin: 0; color: var(--muted); max-width: 60ch; }

/* ---------- arrow list: resources ---------- */
.arrowlist { list-style: none; margin: 0; padding: 0; }
.arrowlist li { padding: 0 0 1.5rem; }
.arrowlist .res-name {
  display: inline-flex; align-items: baseline; gap: 0.55rem;
  font-family: var(--serif); font-size: var(--s1); font-weight: 500;
  color: var(--text); text-decoration: none; line-height: 1.25;
}
.arrowlist .res-name:hover { color: var(--accent); }
.arrowlist .arrow { font-family: var(--mono); font-size: var(--s0); color: var(--accent); flex-shrink: 0; }
.arrowlist p { margin: 0.3rem 0 0 1.75rem; color: var(--muted); font-size: var(--s0); max-width: 54ch; }
.arrowlist .credit { font-family: var(--mono); font-size: var(--s-1); color: var(--faint); }

/* ---------- Q&A ---------- */
.qa { margin: 0; }
.qa details { border-bottom: 1px solid var(--rule); }
.qa summary {
  cursor: pointer; list-style: none;
  padding: 1rem 0;
  font-family: var(--serif); font-size: var(--s1); font-weight: 500; line-height: 1.3;
  display: flex; align-items: baseline; justify-content: space-between; gap: 1.2rem;
}
.qa summary::-webkit-details-marker { display: none; }
.qa summary::after { content: "+"; font-family: var(--mono); font-size: var(--s0); color: var(--accent); flex-shrink: 0; }
.qa details[open] summary::after { content: "\2013"; }
.qa summary:hover { color: var(--accent); }
.qa .answer { padding: 0 0 1.2rem; color: var(--muted); max-width: 62ch; }
.qa .answer strong { color: var(--text); font-weight: 600; }

/* ---------- table (conferences) ---------- */
.table-scroll { overflow-x: auto; }
table.conference-table { width: 100%; border-collapse: collapse; font-size: var(--s0); }
.conference-table th, .conference-table td { text-align: left; padding: 0.85rem 0.9rem 0.85rem 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
.conference-table th { font-family: var(--mono); font-size: var(--s-1); text-transform: uppercase; letter-spacing: 0.08em; color: var(--faint); font-weight: 400; }
.conference-table td:first-child { font-family: var(--serif); font-size: var(--s1); }

/* ---------- timeline (updates) ---------- */
.timeline { list-style: none; margin: 0; padding: 0; }
.timeline li { padding: 1.3rem 0; border-bottom: 1px solid var(--rule); color: var(--muted); }
.timeline time { display: block; font-family: var(--mono); font-size: var(--s-1); color: var(--accent); margin-bottom: 0.35rem; }
.timeline strong { color: var(--text); font-weight: 600; }

/* ---------- suggest + stub + note ---------- */
.suggest { margin: 2.4rem 0 0; padding-top: 1.4rem; border-top: 1px solid var(--rule); }
.suggest p { margin: 0; color: var(--muted); font-size: var(--s0); }
.suggest a { font-family: var(--mono); font-size: var(--s-1); white-space: nowrap; }

.stub { padding: 1.6rem 0; color: var(--muted); }
.stub p { margin: 0; }

.disclaimer { margin: 2rem 0 0; padding-top: 1.4rem; border-top: 1px solid var(--rule); color: var(--faint); font-size: var(--s-1); max-width: 62ch; }

/* ---------- footer ---------- */
.foot { border-top: 1px solid var(--rule); margin-top: clamp(3.5rem, 8vw, 6rem); }
.foot-inner { max-width: var(--measure); margin: 0 auto; padding: 2rem clamp(1.25rem, 5vw, 2rem); display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.foot p, .foot a { font-family: var(--mono); font-size: var(--s-1); color: var(--faint); margin: 0; }
.foot a { text-decoration: none; }
.foot a:hover { color: var(--accent); }

/* ---------- motion ---------- */
@media (prefers-reduced-motion: no-preference) {
  .fade { opacity: 0; transform: translateY(6px); animation: fade 0.6s ease forwards; }
  @keyframes fade { to { opacity: 1; transform: none; } }
}