/* ==========================================================================
   Research hub (index.html). Builds on site.css tokens.
   ========================================================================== */

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.hub .wrap.narrow { width: min(100% - 2.5rem, 42rem); }

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

.hub .hub-hero { padding-block: 1.5rem 1.25rem; }
.hub-hero .eyebrow { margin-bottom: .45rem; }
.hub-hero h1 { max-width: none; font-size: clamp(1.7rem, 3vw, 2.2rem); margin-bottom: .5rem; }
.hub-hero .tagline { max-width: 80ch; font-size: 1rem; margin-bottom: .8rem; }
.hub-hero .actions { gap: .45rem .9rem; align-items: center; }
.hub-hero .actions .btn { padding: .35rem .7rem; font-size: .8rem; }
.hub .research { padding-top: 1.25rem; }
.hub .sechead { margin-bottom: .85rem; }
.hub .sechead h2 { margin-bottom: .35rem; }
.hub .sechead .lede { font-size: .9rem; }
.stats {
  display: flex; flex-wrap: wrap;
  gap: .4rem 1.25rem; margin: .85rem 0 0; padding: 0;
}
.stats > div { display: flex; flex-direction: row-reverse; align-items: baseline; gap: .35rem; }
.stats > div:first-child { border-left: 0; }
.stats dt {
  font-family: var(--sans); font-size: .7rem; font-weight: 650; letter-spacing: .06em;
  color: var(--ink-faint); margin: 0;
}
.stats dd {
  margin: 0; font-size: 1rem; line-height: 1.15; font-weight: 600;
  font-variant-numeric: tabular-nums; color: var(--ink);
}
@media (max-width: 40rem) {
  .stats { gap: .4rem .9rem; }
  .stats > div:nth-child(3) { border-left: 0; }
  .stats > div:nth-child(n+3) { border-top: 0; }
}

/* ---------- section heads + filters ---------- */

.sechead {
  display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between;
  gap: 1rem 2rem; margin-bottom: 1.5rem;
}
.sechead .lede { margin-bottom: 0; max-width: 52ch; }
.filters { display: flex; flex-wrap: wrap; gap: .45rem; }
.chip-btn {
  font-family: var(--sans); font-size: .8125rem; font-weight: 550; cursor: pointer;
  padding: .38rem .85rem; border-radius: 99px;
  border: 1px solid var(--rule-strong); background: var(--paper-raised); color: var(--ink-soft);
  transition: border-color .15s, background .15s, color .15s;
}
.chip-btn:hover { border-color: var(--accent); color: var(--accent); }
.chip-btn[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .chip-btn[aria-pressed="true"] { color: #16121f; }
}
:root[data-theme="dark"] .chip-btn[aria-pressed="true"] { color: #16121f; }

/* ---------- the research table ---------- */

.worktable-wrap {
  border: 1px solid var(--rule); border-radius: var(--radius);
  background: var(--paper-raised); box-shadow: var(--shadow); overflow: hidden;
}
.worktable {
  width: 100%; border-collapse: collapse; table-layout: fixed;
  font-family: var(--sans); font-size: .8125rem;
}
.worktable th, .worktable td {
  white-space: normal; vertical-align: top; text-align: left;
  padding: 1rem 1.1rem; border-bottom: 1px solid var(--rule);
}
.worktable thead th {
  background: var(--paper-sunk); font-size: .68rem; font-weight: 650;
  letter-spacing: .06em; text-transform: uppercase; color: var(--ink-faint);
  padding-block: .7rem;
}
.worktable thead th:nth-child(1) { width: 44%; }
.worktable thead th:nth-child(2) { width: 18%; }
.worktable thead th:nth-child(3) { width: 21%; }
.worktable thead th:nth-child(4) { width: 17%; }

.worktable tr.group th {
  background: color-mix(in srgb, var(--accent-soft) 55%, var(--paper-raised));
  padding: .8rem 1.1rem; border-bottom: 1px solid var(--rule);
}
.gname {
  font-family: var(--serif); font-size: 1.05rem; font-weight: 650; color: var(--ink);
  margin-right: .75rem;
}
.gblurb { font-weight: 400; color: var(--ink-soft); font-size: .8125rem; }

.worktable tbody tr:not(.group):hover td { background: color-mix(in srgb, var(--paper-sunk) 55%, transparent); }
.worktable tbody:last-child tr:last-child td { border-bottom: 0; }

.worktable td > span, .worktable td > a { display: block; }
.wtitle { font-family: var(--serif); font-size: 1rem; line-height: 1.4; font-weight: 600; margin-bottom: .35rem; }
.wtitle a { color: var(--ink); text-decoration: none; }
.wtitle a:hover { color: var(--accent); text-decoration: underline; }
.summary { color: var(--ink-soft); line-height: 1.55; margin-bottom: .55rem; }
.chips { display: flex !important; flex-wrap: wrap; gap: .3rem; }
.chip {
  font-family: var(--mono); font-size: .68rem; color: var(--ink-faint);
  border: 1px solid var(--rule); border-radius: 4px; padding: .05rem .35rem;
}

.ver { font-weight: 650; color: var(--ink); font-size: .875rem; }
.date { color: var(--ink-faint); margin-bottom: .35rem; }
.doi { font-family: var(--mono); font-size: .72rem; word-break: break-all; margin-bottom: .3rem; }
.sub { color: var(--ink-faint); font-size: .75rem; line-height: 1.5; margin-top: .25rem; }
.sub a { color: var(--ink-soft); }
.repos a { word-break: break-word; }
.none { color: var(--ink-faint); }

.palomar {
  display: inline-flex !important; align-items: stretch; text-decoration: none;
  border: 1px solid color-mix(in srgb, var(--good) 45%, transparent); border-radius: 6px;
  overflow: hidden; font-family: var(--mono); font-size: .72rem; margin-bottom: .35rem;
  max-width: 100%;
}
.palomar .pid { padding: .2rem .45rem; color: var(--ink); background: var(--good-soft); }
.palomar .pv { padding: .2rem .45rem; color: #fff; background: var(--good); font-weight: 650; }
.palomar:hover { border-color: var(--good); }
.trust { color: var(--good); font-weight: 600; font-size: .75rem; }
.trust::first-letter { text-transform: uppercase; }

.btn-sm { display: inline-flex !important; font-size: .78rem; padding: .4rem .75rem; margin-bottom: .35rem; }

.tablenote { font-family: var(--sans); font-size: .78rem; color: var(--ink-faint); margin-top: .9rem; }

/* phones and narrow tablets: each row becomes a card */
@media (max-width: 56rem) {
  .worktable, .worktable thead, .worktable tbody, .worktable tr, .worktable th, .worktable td { display: block; width: 100% !important; }
  .worktable thead { position: absolute; left: -9999px; }
  .worktable tbody[hidden] { display: none; }
  .worktable tr:not(.group) { border-bottom: 1px solid var(--rule); padding: .4rem 0; }
  .worktable td { border: 0; padding: .45rem 1.1rem; }
  .worktable td::before {
    content: attr(data-label); display: block; font-size: .65rem; font-weight: 650;
    letter-spacing: .06em; text-transform: uppercase; color: var(--ink-faint); margin-bottom: .2rem;
  }
  .worktable td.c-result::before { display: none; }
  .worktable td.c-result { padding-top: .9rem; }
  .worktable td.c-explore .none { display: none; }
  .worktable td.c-explore:has(.none) { display: none; }
}

/* ---------- explainer cards ---------- */

.excards { grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr)); }
.excard b { font-family: var(--serif); font-size: 1.05rem; line-height: 1.35; margin: .3rem 0 .5rem; }
.excard .covers { margin-top: .75rem; color: var(--warn); font-size: .75rem; }
.eyebrow-sm {
  font-family: var(--sans); font-size: .66rem !important; font-weight: 650;
  letter-spacing: .08em; text-transform: uppercase; color: var(--accent) !important;
}