/* aiHK knowledge hub — "provenance ledger" design system
   Signature: every record wears its epistemic status (a monospace provenance seal).
   Palette: warm paper + deep teal-ink brand + semantic verification colours.
   Type: Spectral (canonical titles) / Inter (body) / IBM Plex Mono (machine-checked metadata). */

:root {
  /* paper & ink */
  --paper:      #FBF8F1;
  --paper-2:    #F3EEE2;   /* sunk panels */
  --rule:       #E2DBC9;   /* hairlines */
  --ink:        #1C1A16;   /* primary text */
  --ink-soft:   #514B40;   /* secondary text */
  --ink-faint:  #8A8270;   /* captions */

  /* brand: deep teal-ink (NOT terracotta) */
  --brand:      #114B45;
  --brand-deep: #0C332F;
  --brand-tint: #DCE9E5;

  /* semantic verification states — the signature colours */
  --ok:    #1E6B53;  --ok-bg:   #E3EFE7;   /* canonical / verified */
  --warn:  #8A5A12;  --warn-bg: #F3E9D4;   /* disputed */
  --myth:  #9B2D24;  --myth-bg: #F3DEDB;   /* pop-myth / do-not-attribute */
  --none:  #545C66;  --none-bg: #E6E8EC;   /* none-extant / unknown */

  --maxw: 64rem;
  --r: 6px;

  --serif: "Spectral", "Songti TC", "Times New Roman", Georgia, serif;
  --sans:  "Inter", system-ui, -apple-system, "PingFang TC", "Helvetica Neue", Arial, sans-serif;
  --mono:  "IBM Plex Mono", ui-monospace, "SF Mono", "Cascadia Code", Menlo, monospace;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  font-feature-settings: "kern", "liga";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2.5px solid var(--brand); outline-offset: 3px; border-radius: 2px; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 1.4rem; }

/* ---- masthead ---------------------------------------------------------- */
.masthead {
  border-bottom: 1px solid var(--rule);
  background: linear-gradient(180deg, var(--paper) 0%, var(--paper) 70%, #F7F2E8 100%);
}
.masthead .wrap { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; padding-top: 1.1rem; padding-bottom: 1.1rem; }
.brand { font-family: var(--serif); font-weight: 600; font-size: 1.35rem; letter-spacing: -0.01em; color: var(--ink); }
.brand b { color: var(--brand); font-weight: 700; }
.brand .zh { font-size: .9rem; color: var(--ink-faint); margin-left: .5rem; letter-spacing: .04em; }
.nav { font-family: var(--mono); font-size: .76rem; text-transform: uppercase; letter-spacing: .09em; display: flex; gap: 1.1rem; }
.nav a { color: var(--ink-soft); }

/* ---- hero: a method statement, not a big number ------------------------ */
.hero { padding: 4.2rem 0 2.6rem; border-bottom: 1px solid var(--rule); }
.hero .eyebrow {
  font-family: var(--mono); font-size: .72rem; letter-spacing: .22em; text-transform: uppercase;
  color: var(--brand); margin: 0 0 1.1rem;
}
.hero h1 {
  font-family: var(--serif); font-weight: 600; font-size: clamp(2.1rem, 5.2vw, 3.5rem);
  line-height: 1.08; letter-spacing: -0.02em; margin: 0 0 1.1rem; max-width: 22ch;
}
.hero h1 em { font-style: italic; color: var(--brand); }
.hero .lede { font-size: 1.16rem; color: var(--ink-soft); max-width: 56ch; margin: 0; }
.hero .zh-line { font-family: var(--serif); color: var(--ink-faint); margin-top: .8rem; letter-spacing: .06em; }

/* corpus stat strip — supporting, not the headline */
.stats { display: flex; flex-wrap: wrap; gap: 2.4rem; margin-top: 2.4rem; padding-top: 1.6rem; border-top: 1px dashed var(--rule); }
.stat .n { font-family: var(--mono); font-size: 1.7rem; font-weight: 600; color: var(--ink); line-height: 1; }
.stat .l { font-family: var(--mono); font-size: .7rem; text-transform: uppercase; letter-spacing: .1em; color: var(--ink-faint); margin-top: .45rem; }

/* ---- provenance seal: THE signature element ---------------------------- */
.seal {
  display: inline-flex; align-items: center; gap: .4em;
  font-family: var(--mono); font-size: .68rem; font-weight: 500;
  letter-spacing: .06em; text-transform: uppercase;
  padding: .22em .6em; border-radius: 100px; border: 1px solid currentColor;
  white-space: nowrap; line-height: 1;
}
.seal .dot { width: .5em; height: .5em; border-radius: 50%; background: currentColor; flex: none; }
.seal.ok   { color: var(--ok);   background: var(--ok-bg); }
.seal.warn { color: var(--warn); background: var(--warn-bg); }
.seal.myth { color: var(--myth); background: var(--myth-bg); }
.seal.none { color: var(--none); background: var(--none-bg); }

/* ---- section + corpus index ------------------------------------------- */
section { padding: 3rem 0; }
.section-head { display: flex; align-items: baseline; gap: 1rem; margin-bottom: 1.6rem; border-bottom: 1px solid var(--rule); padding-bottom: .7rem; }
.section-head h2 { font-family: var(--serif); font-weight: 600; font-size: 1.5rem; letter-spacing: -0.01em; margin: 0; }
.section-head .count { font-family: var(--mono); font-size: .78rem; color: var(--ink-faint); }
.kicker { font-family: var(--mono); font-size: .72rem; letter-spacing: .16em; text-transform: uppercase; color: var(--brand); margin: 0 0 .5rem; }

/* domain groups */
.domain-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr)); gap: 1rem; }
.domain-card { border: 1px solid var(--rule); border-radius: var(--r); padding: 1.1rem 1.2rem; background: #FFFEFB; }
.domain-card h3 { font-family: var(--serif); font-size: 1.18rem; margin: 0 0 .2rem; text-transform: capitalize; }
.domain-card .meta { font-family: var(--mono); font-size: .72rem; color: var(--ink-faint); }

/* record list (entries) */
.records { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--rule); }
.records li { border-bottom: 1px solid var(--rule); }
.records a.rec {
  display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 1rem;
  padding: .85rem .4rem; color: inherit;
}
.records a.rec:hover { background: var(--paper-2); text-decoration: none; }
.rec .title { display: block; font-family: var(--serif); font-size: 1.08rem; color: var(--ink); }
.rec .title .zh { font-family: var(--serif); color: var(--ink-faint); font-size: .92rem; margin-left: .55rem; }
.rec .sub { display: block; font-family: var(--mono); font-size: .7rem; color: var(--ink-faint); text-transform: uppercase; letter-spacing: .06em; margin-top: .25rem; }

/* filter chips */
.filters { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1.4rem; }
.chip {
  font-family: var(--mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .06em;
  padding: .3rem .7rem; border: 1px solid var(--rule); border-radius: 100px; background: #FFFEFB;
  color: var(--ink-soft); cursor: pointer;
}
.chip[aria-pressed="true"] { background: var(--brand); border-color: var(--brand); color: #fff; }

/* ---- entry (record) page ---------------------------------------------- */
.record-head { padding: 2.8rem 0 1.4rem; border-bottom: 1px solid var(--rule); }
.breadcrumb { font-family: var(--mono); font-size: .72rem; letter-spacing: .04em; color: var(--ink-faint); margin-bottom: 1rem; }
.breadcrumb a { color: var(--ink-soft); }
.record-head h1 { font-family: var(--serif); font-weight: 600; font-size: clamp(1.8rem, 4vw, 2.7rem); line-height: 1.12; letter-spacing: -0.015em; margin: .2rem 0 .3rem; }
.record-head .zh-title { font-family: var(--serif); font-size: 1.4rem; color: var(--ink-soft); margin: 0 0 1rem; letter-spacing: .04em; }
.seal-row { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .4rem; }

.record-body { display: grid; grid-template-columns: minmax(0,1fr) 17rem; gap: 2.6rem; padding: 2rem 0 3rem; align-items: start; }
.prose { font-size: 1.08rem; }
.prose h1, .prose h2, .prose h3 { font-family: var(--serif); font-weight: 600; letter-spacing: -0.01em; line-height: 1.2; }
.prose h1 { font-size: 1.7rem; margin: 1.6rem 0 .8rem; }
.prose h2 { font-size: 1.35rem; margin: 1.8rem 0 .7rem; }
.prose h3 { font-size: 1.12rem; margin: 1.4rem 0 .5rem; }
.prose p { margin: .8rem 0; }
.prose ul, .prose ol { margin: .8rem 0; padding-left: 1.3rem; }
.prose li { margin: .3rem 0; }
.prose code { font-family: var(--mono); font-size: .86em; background: var(--paper-2); padding: .1em .35em; border-radius: 4px; }
.prose blockquote { margin: 1rem 0; padding: .4rem 0 .4rem 1.1rem; border-left: 3px solid var(--brand-tint); color: var(--ink-soft); }
.prose hr { border: 0; border-top: 1px solid var(--rule); margin: 1.6rem 0; }
.prose em { color: var(--ink-soft); }
.prose a.wikilink { border-bottom: 1px dotted var(--brand); }
.prose a.wikilink.missing { color: var(--ink-faint); border-bottom-style: dashed; cursor: help; }

/* provenance sidecar — the machine-checked record */
.provenance { font-family: var(--mono); font-size: .8rem; border: 1px solid var(--rule); border-radius: var(--r); background: #FFFEFB; position: sticky; top: 1.2rem; }
.provenance .ph { padding: .7rem .9rem; border-bottom: 1px solid var(--rule); font-size: .68rem; text-transform: uppercase; letter-spacing: .14em; color: var(--ink-faint); }
.provenance dl { margin: 0; padding: .4rem .9rem .9rem; }
.provenance dt { font-size: .64rem; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-faint); margin-top: .8rem; }
.provenance dd { margin: .15rem 0 0; color: var(--ink); word-break: break-word; }
.provenance dd.danger { color: var(--myth); }
.provenance .src { font-size: .72rem; color: var(--ink-soft); }
.related { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .3rem; }
.related a { font-size: .72rem; padding: .15rem .5rem; border: 1px solid var(--rule); border-radius: 100px; color: var(--brand); }

/* ---- callout / data note ---------------------------------------------- */
.note { border: 1px solid var(--rule); border-left: 3px solid var(--brand); background: var(--paper-2); border-radius: var(--r); padding: 1rem 1.2rem; font-size: .95rem; color: var(--ink-soft); }
.note b { color: var(--ink); }

/* ---- footer ------------------------------------------------------------ */
footer { border-top: 1px solid var(--rule); margin-top: 2rem; padding: 2.4rem 0 3.5rem; color: var(--ink-faint); font-size: .86rem; }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; }
footer a { color: var(--ink-soft); }
footer .mono { font-family: var(--mono); font-size: .72rem; letter-spacing: .04em; }

/* ---- responsive -------------------------------------------------------- */
@media (max-width: 860px) {
  .record-body { grid-template-columns: 1fr; gap: 1.4rem; }
  .provenance { position: static; }
  .masthead .wrap { flex-direction: column; align-items: flex-start; gap: .5rem; }
}
@media (prefers-reduced-motion: no-preference) {
  .records a.rec, .chip, .domain-card { transition: background .14s ease; }
}
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }