:root {
  --ink: #1c1a17;
  --ink-soft: #57514a;
  --ink-faint: #8a8177;
  --paper: #faf7f2;
  --paper-2: #f3ece1;
  --rule: #ddd2c1;
  --seal: #9c3b2e;
  --seal-soft: #c96b56;
  --jade: #3f6b5c;
  --shadow: 0 1px 2px rgba(28,26,23,.05), 0 8px 24px rgba(28,26,23,.06);
  --serif-zh: "Songti SC", "SimSun", "Noto Serif SC", "Source Han Serif SC", serif;
  --serif-en: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif-en);
  font-size: 16px;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
}

.wrap { max-width: 940px; margin: 0 auto; padding: 0 20px; }

.topbar {
  position: sticky; top: 0; z-index: 40;
  background: rgba(250,247,242,.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--rule);
}
.topbar .wrap {
  display: flex; align-items: center; gap: 14px;
  min-height: 54px; flex-wrap: wrap;
}
.brand {
  font-family: var(--serif-zh);
  font-size: 17px; letter-spacing: .12em; color: var(--seal);
  text-decoration: none; font-weight: 600; white-space: nowrap;
}
.brand span { color: var(--ink-faint); font-family: var(--sans); font-size: 11px; letter-spacing: .18em; text-transform: uppercase; margin-left: 8px; }
.topnav { margin-left: auto; display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.topnav a {
  color: var(--ink-soft); text-decoration: none; font-family: var(--sans);
  font-size: 12.5px; padding: 5px 9px; border-radius: 6px;
}
.topnav a:hover { background: var(--paper-2); color: var(--ink); }

.langtoggle { display: inline-flex; border: 1px solid var(--rule); border-radius: 999px; overflow: hidden; background: #fff; }
.langtoggle button {
  border: 0; background: transparent; cursor: pointer;
  font-family: var(--sans); font-size: 12px; letter-spacing: .04em;
  padding: 6px 12px; color: var(--ink-soft);
}
.langtoggle button + button { border-left: 1px solid var(--rule); }
.langtoggle button[aria-pressed="true"] { background: var(--seal); color: #fff; }

.hero { padding: 56px 0 30px; border-bottom: 1px solid var(--rule); }
.hero .eyebrow {
  font-family: var(--sans); font-size: 11.5px; letter-spacing: .28em;
  text-transform: uppercase; color: var(--ink-faint); margin: 0 0 16px;
}
.hero h1 {
  font-family: var(--serif-zh); font-weight: 600;
  font-size: clamp(30px, 6vw, 46px); letter-spacing: .1em;
  margin: 0 0 6px; line-height: 1.25;
}
.hero h2 {
  font-family: var(--serif-en); font-weight: 400; font-style: italic;
  font-size: clamp(16px, 3vw, 21px); color: var(--ink-soft);
  margin: 0 0 22px; letter-spacing: .01em;
}
.hero .lede { max-width: 62ch; color: var(--ink-soft); margin: 0; }
.hero .lede p { margin: 0 0 10px; }
.meta {
  margin-top: 26px; display: flex; gap: 10px 26px; flex-wrap: wrap;
  font-family: var(--sans); font-size: 12.5px; color: var(--ink-faint);
}
.meta b { color: var(--ink-soft); font-weight: 600; }

section { padding: 44px 0; border-bottom: 1px solid var(--rule); }
section:last-of-type { border-bottom: 0; }
.sec-head { margin-bottom: 22px; }
.sec-head h3 {
  font-family: var(--serif-zh); font-size: 22px; letter-spacing: .08em;
  margin: 0 0 3px; font-weight: 600;
}
.sec-head p {
  margin: 0; font-family: var(--sans); font-size: 12px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--ink-faint);
}

.poem {
  background: var(--paper-2); border: 1px solid var(--rule); border-radius: 12px;
  padding: 22px; box-shadow: var(--shadow);
}
.poem-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; }
.poem-cell { background: #fff; border: 1px solid var(--rule); border-radius: 8px; padding: 10px 12px; }
.poem-cell .zh { font-family: var(--serif-zh); font-size: 17px; letter-spacing: .06em; }
.poem-cell .en { font-family: var(--sans); font-size: 11px; color: var(--ink-faint); letter-spacing: .06em; margin-top: 2px; }
.poem-cell.active { border-color: var(--seal-soft); box-shadow: 0 0 0 2px rgba(156,59,46,.1); }
.poem-note { margin: 14px 0 0; font-size: 14.5px; color: var(--ink-soft); }

.controls { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-bottom: 18px; }
.controls button, .controls .searchbox {
  font-family: var(--sans); font-size: 12.5px;
  border: 1px solid var(--rule); background: #fff; color: var(--ink-soft);
  border-radius: 999px; padding: 7px 14px; cursor: pointer;
}
.controls button:hover { border-color: var(--seal-soft); color: var(--seal); }
.controls .searchbox { cursor: text; padding: 0; display: inline-flex; align-items: center; }
.controls .searchbox input {
  border: 0; outline: 0; background: transparent; font-family: var(--sans);
  font-size: 12.5px; padding: 7px 14px; width: 190px; color: var(--ink);
}
.hint { font-family: var(--sans); font-size: 12px; color: var(--ink-faint); margin-left: auto; }

.tree { font-size: 15px; }
.tree ul { list-style: none; margin: 0; padding: 0 0 0 22px; position: relative; }
.tree > ul { padding-left: 0; }
.tree ul ul::before {
  content: ""; position: absolute; left: 6px; top: 0; bottom: 14px;
  border-left: 1px solid var(--rule);
}
.node { position: relative; padding: 3px 0; }
.tree ul ul > .node::before {
  content: ""; position: absolute; left: -16px; top: 22px;
  width: 15px; border-top: 1px solid var(--rule);
}
.card {
  display: flex; align-items: flex-start; gap: 10px;
  background: #fff; border: 1px solid var(--rule); border-radius: 10px;
  padding: 9px 13px; box-shadow: var(--shadow);
  cursor: pointer; width: fit-content; max-width: 100%;
  transition: border-color .15s, box-shadow .15s;
}
.card:hover { border-color: var(--seal-soft); }
.node.detail-open > .card { border-color: var(--seal-soft); box-shadow: 0 0 0 3px rgba(156,59,46,.08); }
.card.hit { background: #fff8e6; border-color: #e0b64a; }
.twisty {
  flex: 0 0 auto; width: 16px; height: 16px; margin-top: 5px;
  border: 1px solid var(--rule); border-radius: 4px; color: var(--ink-faint);
  font-family: var(--sans); font-size: 11px; line-height: 14px; text-align: center;
  background: var(--paper-2);
}
.twisty.leaf { visibility: hidden; }
.twisty:not(.leaf) { cursor: pointer; }
.twisty:not(.leaf):hover { color: var(--seal); border-color: var(--seal-soft); background: #fff; }
.node.open > .card .twisty { color: var(--seal); border-color: var(--seal-soft); }
.namebox { min-width: 0; }
.name-zh { font-family: var(--serif-zh); font-size: 17px; letter-spacing: .05em; }
.name-en { font-family: var(--sans); font-size: 11.5px; color: var(--ink-faint); letter-spacing: .04em; }
.spouse { font-size: 13px; color: var(--jade); margin-top: 2px; }
.chip {
  display: inline-block; font-family: var(--sans); font-size: 10.5px;
  letter-spacing: .06em; padding: 1px 7px; border-radius: 999px;
  background: var(--paper-2); color: var(--ink-soft); border: 1px solid var(--rule);
  margin: 3px 4px 0 0;
}
.chip.gen { background: #fff; color: var(--seal); border-color: var(--seal-soft); }
.chip.unknown { background: #fff; color: var(--ink-faint); border-style: dashed; }
.detail {
  display: none; margin: 6px 0 10px 26px; padding: 12px 16px;
  border-left: 2px solid var(--seal-soft); background: var(--paper-2);
  border-radius: 0 8px 8px 0; max-width: 68ch;
}
.node.detail-open > .detail { display: block; }
.detail p { margin: 0 0 9px; font-size: 14.5px; }
.detail p:last-child { margin-bottom: 0; }
.detail .zh { font-family: var(--serif-zh); line-height: 1.85; }
.detail .en { color: var(--ink-soft); }
.detail .label {
  font-family: var(--sans); font-size: 10.5px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--ink-faint); margin: 12px 0 4px;
}
.detail .label:first-child { margin-top: 0; }

.entry { margin-bottom: 34px; }
.entry:last-child { margin-bottom: 0; }
.entry h4 { font-family: var(--serif-zh); font-size: 18px; letter-spacing: .06em; margin: 0 0 2px; }
.entry .h-en { font-family: var(--serif-en); font-style: italic; color: var(--ink-soft); margin: 0 0 12px; font-size: 15px; }
.entry .zh { font-family: var(--serif-zh); line-height: 1.95; }
.entry .en { color: var(--ink-soft); }
.entry p { margin: 0 0 11px; max-width: 68ch; }

.gaps { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.gap {
  background: #fff; border: 1px solid var(--rule); border-left: 3px solid var(--seal-soft);
  border-radius: 0 10px 10px 0; padding: 15px 17px; box-shadow: var(--shadow);
}
.gap h5 { font-family: var(--serif-zh); font-size: 15.5px; margin: 0 0 2px; letter-spacing: .05em; }
.gap .h-en { font-family: var(--sans); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-faint); margin: 0 0 9px; }
.gap p { margin: 0 0 8px; font-size: 14px; }
.gap p:last-child { margin: 0; }
.gap .zh { font-family: var(--serif-zh); }
.gap .en { color: var(--ink-soft); }

footer { padding: 34px 0 60px; font-family: var(--sans); font-size: 12.5px; color: var(--ink-faint); }
footer a { color: var(--seal); }
footer p { margin: 0 0 6px; max-width: 68ch; }

body[data-lang="zh"] .en, body[data-lang="zh"] .name-en { display: none !important; }
body[data-lang="en"] .zh, body[data-lang="en"] .zh-only { display: none !important; }
body[data-lang="both"] .spouse .en::before,
body[data-lang="both"] .chip .en::before { content: " · "; color: var(--ink-faint); }
body[data-lang="en"] .name-zh { font-size: 15px; color: var(--ink-faint); }
body[data-lang="en"] .name-en { font-size: 15.5px; color: var(--ink); font-family: var(--serif-en); }
body[data-lang="en"] .entry .h-en {
  font-family: var(--serif-en); font-style: normal; font-weight: 600;
  font-size: 19px; color: var(--ink); margin-bottom: 12px;
}
body[data-lang="en"] .sec-head p {
  font-family: var(--serif-en); font-size: 22px; text-transform: none;
  letter-spacing: 0; color: var(--ink); font-weight: 600;
}
body[data-lang="en"] .gap .h-en {
  font-family: var(--serif-en); font-size: 15.5px; text-transform: none;
  letter-spacing: 0; color: var(--ink); font-weight: 600;
}

section, header { scroll-margin-top: 62px; }

@media (max-width: 680px) {
  .topnav a { display: none; }
  .topbar .wrap { min-height: 50px; flex-wrap: nowrap; }
  section, header { scroll-margin-top: 56px; }
}

@media (max-width: 620px) {
  body { font-size: 15.5px; }
  .hero { padding: 34px 0 24px; }
  .tree ul { padding-left: 16px; }
  .tree ul ul > .node::before { left: -12px; width: 11px; }
  .controls .searchbox input { width: 130px; }
  .hint { display: none; }
}

@media print {
  .topbar, .controls, .twisty { display: none; }
  .detail { display: block !important; }
  .card { box-shadow: none; }
}