/* name that ui? · 界面叫啥 — warm-paper specimen cabinet. See DESIGN.md. */

@font-face {
  font-family: "Geist";
  src: url("/assets/fonts/geist-vf.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Geist Mono";
  src: url("/assets/fonts/geist-mono-vf.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

:root {
  --font-sans: "Geist", -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --paper: #FAFAF8;
  --paper-raised: #FFFFFF;
  --ink: #1C1917;
  --ink-2: #57534E;
  --ink-3: #A8A29E;
  --line: #E7E5E0;
  --line-strong: #D6D3CC;
  --accent: #E0551F;
  --accent-hover: #C44A19;
  --accent-soft: #FBEDE6;
  --stage: #F4F4F1;

  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --shadow-pop: 0 4px 16px rgba(28, 25, 23, 0.08);
  --radius: 12px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.65;
  text-wrap: pretty;
}
::selection { background: var(--accent-soft); color: var(--accent-hover); }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.mono { font-family: var(--font-mono); }
.mono-sm { font-family: var(--font-mono); font-size: 12px; line-height: 1.7; }
.fw { font-weight: 600; }
.fw-500 { font-weight: 500; }

/* ---------- bilingual mode ---------- */
.lang-zh { color: var(--ink-2); }
[data-lang-mode="en"] .lang-zh { display: none !important; }
[data-lang-mode="zh"] .lang-en { display: none !important; }
[data-lang-mode="zh"] .lang-zh { color: inherit; }
.zh-line { display: block; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250, 250, 248, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.header-in { display: flex; align-items: center; gap: 20px; height: 54px; }
.wordmark {
  font-family: var(--font-mono); font-weight: 600; font-size: 15px;
  color: var(--ink); letter-spacing: -0.01em; white-space: nowrap;
}
.wordmark .q { color: var(--accent); }
.wordmark:hover { color: var(--ink); }
.wordmark-zh { margin-left: 8px; font-size: 12px; color: var(--ink-3); font-weight: 400; }
.site-nav { display: flex; gap: 16px; margin-left: auto; }
.site-nav a { font-size: 13px; color: var(--ink-2); display: inline-flex; align-items: baseline; gap: 5px; }
.site-nav a:hover { color: var(--ink); }
.nav-zh { font-size: 11.5px; color: var(--ink-3); }
.lang-switch { display: flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: var(--paper-raised); }
.ls-btn {
  border: 0; background: transparent; padding: 5px 10px; font-size: 12px;
  font-family: var(--font-sans); color: var(--ink-2); cursor: pointer;
  transition: background-color 150ms var(--ease-out), color 150ms var(--ease-out);
}
.ls-btn + .ls-btn { border-left: 1px solid var(--line); }
.ls-btn:hover { background: var(--stage); }
.ls-btn.active { background: var(--accent-soft); color: var(--accent); font-weight: 500; }

/* ---------- hero ---------- */
.hero { padding: 64px 0 8px; }
.hero-title { margin: 0; font-size: clamp(34px, 5vw, 52px); font-weight: 650; letter-spacing: -0.03em; line-height: 1.08; text-wrap: balance; }
.hero-title .lang-en::after { content: ""; }
.hero-title-zh { display: block; margin-top: 6px; font-size: 0.52em; font-weight: 600; letter-spacing: 0; color: var(--ink-2); }
[data-lang-mode="zh"] .hero-title-zh { font-size: 0.85em; margin-top: 0; color: var(--ink); }
.hero-sub { max-width: 620px; margin: 16px 0 0; font-size: 15px; line-height: 1.7; color: var(--ink-2); }
.hero-sub.lang-zh { margin-top: 4px; font-size: 14px; }
.vibe-promo { margin: 18px 0 0; font-size: 13.5px; display: flex; align-items: center; gap: 8px; }

/* ---------- controls ---------- */
.controls { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 26px; }
.search-box {
  display: flex; align-items: center; gap: 8px; flex: 1; min-width: 240px; max-width: 460px;
  background: var(--paper-raised); border: 1px solid var(--line); border-radius: 10px;
  padding: 0 12px; height: 40px; color: var(--ink-3);
  transition: border-color 150ms var(--ease-out), box-shadow 150ms var(--ease-out);
}
.search-box:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.search-box input { flex: 1; border: 0; outline: 0; background: transparent; font: inherit; font-size: 14px; color: var(--ink); min-width: 0; }
.search-box input::placeholder { color: var(--ink-3); }
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid var(--line); border-radius: 8px; background: var(--paper-raised);
  padding: 0 14px; height: 40px; font: inherit; font-size: 13.5px; color: var(--ink);
  cursor: pointer; transition: border-color 150ms var(--ease-out), background-color 150ms var(--ease-out), transform 60ms var(--ease-out);
}
.btn:hover { border-color: var(--line-strong); background: var(--stage); }
.btn:active { transform: scale(0.97); }
.tabs { display: flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: var(--paper-raised); height: 40px; }
.tab {
  border: 0; background: transparent; padding: 0 16px; font: inherit; font-size: 13px;
  font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.06em; font-size: 11px;
  color: var(--ink-2); cursor: pointer; transition: background-color 150ms var(--ease-out), color 150ms var(--ease-out);
}
.tab + .tab { border-left: 1px solid var(--line); }
.tab:hover { background: var(--stage); }
.tab.active { background: var(--ink); color: var(--paper); }
.count-note { margin: 14px 0 0; font-size: 12.5px; color: var(--ink-3); }
.count-note .lang-zh { margin-left: 8px; }

/* ---------- specimen grid ---------- */
.grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px; padding: 28px 0 40px;
}
.card { display: block; border-radius: var(--radius); outline-offset: 4px; }
.card:focus-visible { outline: 2px solid var(--accent); }
.stage {
  position: relative; overflow: hidden; border: 1px solid var(--line);
  border-radius: var(--radius); background: var(--stage);
  transition: border-color 200ms var(--ease-out);
}
.stage-card { height: 200px; }
.card:hover .stage { border-color: var(--line-strong); }
.stage-center { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; padding: 20px; }
.pe-none { pointer-events: none; }
.pe-none .fragment { pointer-events: none; user-select: none; }
.fragment { display: flex; align-items: center; justify-content: center; width: 100%; height: 100%; max-width: 100%; }
.card-meta { padding: 12px 4px 0; }
.card-name { margin: 0; font-size: 14.5px; font-weight: 550; line-height: 1.4; display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px; }
.card-name-zh { font-size: 12.5px; font-weight: 400; color: var(--ink-2); }
.card-symbol { margin: 3px 0 0; font-family: var(--font-mono); font-size: 11.5px; color: var(--accent); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.card-tag { margin: 5px 0 0; font-size: 13px; line-height: 1.5; color: var(--ink-2); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-tag.lang-zh { font-size: 12.5px; margin-top: 2px; }
.tag {
  font-family: var(--font-mono); font-size: 9px; font-weight: 500; text-transform: uppercase;
  letter-spacing: 0.1em; vertical-align: 2px;
}
.tag-new { color: var(--accent); margin-left: 8px; }
.tag-platform { color: var(--ink-3); margin-left: auto; }
.entry-title .tag-platform { margin-left: 12px; }

.no-result { padding: 40px 0 60px; text-align: center; color: var(--ink-2); font-size: 14px; }
.no-result .lang-zh { display: block; margin-top: 4px; font-size: 13.5px; }

/* ---------- guides ---------- */
.guides { padding: 20px 0 70px; border-top: 1px solid var(--line); }
.section-title { margin: 36px 0 18px; font-family: var(--font-mono); font-size: 11px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-3); }
.section-title .lang-zh { margin-left: 10px; letter-spacing: 0.06em; }
.guide-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }
.guide-card {
  display: flex; flex-direction: column; gap: 6px; padding: 20px;
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper-raised);
  color: var(--ink); transition: border-color 150ms var(--ease-out);
}
.guide-card:hover { border-color: var(--line-strong); color: var(--ink); }
.guide-kind { font-family: var(--font-mono); font-size: 9.5px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--accent); }
.guide-title { font-size: 16px; font-weight: 600; letter-spacing: -0.01em; }
.guide-desc { font-size: 13px; line-height: 1.55; color: var(--ink-2); }
.guide-desc.lang-zh { font-size: 12.5px; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); margin-top: 20px; }
.footer-in { padding: 26px 24px 34px; font-size: 12.5px; color: var(--ink-2); display: flex; flex-direction: column; gap: 6px; }
.footer-in p { margin: 0; }
.foot-src { color: var(--ink-3); }
.foot-links { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.foot-links .sep { color: var(--line-strong); }
.q { color: var(--accent); }

/* ---------- entry page ---------- */
.entry { padding-bottom: 70px; }
.crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 22px 0 0; font-size: 13px; color: var(--ink-3); }
.crumbs a { color: var(--ink-2); }
.crumbs a:hover { color: var(--accent); }
.crumb-sep { color: var(--line-strong); }
.crumb-cur { color: var(--ink); }
.entry-head { padding: 20px 0 24px; }
.entry-title { margin: 0; font-size: clamp(26px, 3.4vw, 36px); font-weight: 650; letter-spacing: -0.025em; line-height: 1.15; text-wrap: balance; display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px; }
.entry-title-zh { font-size: 0.55em; font-weight: 500; color: var(--ink-2); letter-spacing: 0; }
[data-lang-mode="zh"] .entry-title-zh { font-size: 0.8em; color: var(--ink); }
.entry-tag { margin: 12px 0 0; font-size: 16px; color: var(--ink-2); }
.entry-tag.lang-zh { margin-top: 3px; font-size: 14.5px; }
.entry-meta { margin: 20px 0 0; display: flex; flex-direction: column; gap: 12px; }
.meta-row { display: grid; grid-template-columns: 150px 1fr; gap: 12px; align-items: start; }
.meta-row dt { font-family: var(--font-mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-3); padding-top: 3px; }
.dt-zh { display: block; letter-spacing: 0.05em; }
.meta-row dd { margin: 0; font-size: 13.5px; color: var(--ink-2); }
.fuzzy-list { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 4px; }
.stage-detail { height: 380px; background: var(--stage); }
.stage-hint { margin: 8px 2px 0; font-size: 12px; color: var(--ink-3); }

/* ---------- sections ---------- */
.sect { margin-top: 44px; max-width: 760px; }
.sect .section-title { margin-top: 0; }

/* ---------- parts / anatomy ---------- */
.parts { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; }
.part { padding: 18px 0; border-top: 1px solid var(--line); }
.part:first-child { border-top: 0; padding-top: 0; }
.part-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px; }
.part-num {
  font-family: var(--font-mono); font-size: 10.5px; color: var(--accent);
  border: 1px solid var(--accent-soft); background: var(--accent-soft);
  width: 20px; height: 20px; border-radius: 6px; display: inline-flex; align-items: center; justify-content: center;
  align-self: center;
}
.part-name { font-size: 15px; font-weight: 600; display: inline-flex; flex-wrap: wrap; gap: 8px; align-items: baseline; }
.part-name-zh { font-size: 13px; font-weight: 400; color: var(--ink-2); }
.part-api { font-family: var(--font-mono); font-size: 11.5px; color: var(--accent); margin-left: auto; }
.part-desc { margin: 8px 0 0; font-size: 14px; line-height: 1.7; color: var(--ink-2); }
.part-desc.lang-zh { margin-top: 3px; font-size: 13.5px; }
.part-prompt { margin-top: 10px; padding: 10px 12px; background: var(--stage); border-radius: 8px; }
.part-prompt-label { font-family: var(--font-mono); font-size: 9.5px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-3); display: flex; gap: 8px; }
.part-prompt p { margin: 5px 0 0; color: var(--ink-2); }

/* ---------- copy blocks ---------- */
.copy-block { position: relative; background: var(--stage); border: 1px solid var(--line); border-radius: 10px; padding: 16px 16px 14px; }
.btn-copy { position: absolute; top: 10px; right: 10px; height: 28px; padding: 0 10px; font-size: 12px; border-radius: 6px; }
.btn-copy.done { border-color: var(--accent); color: var(--accent); }
.copy-text p { margin: 0; font-family: var(--font-mono); font-size: 12.5px; line-height: 1.75; color: var(--ink); padding-right: 64px; }
.copy-text .zh-copy { margin-top: 8px; padding-top: 8px; border-top: 1px dashed var(--line-strong); color: var(--ink-2); font-family: var(--font-sans); font-size: 13px; }

/* ---------- api table ---------- */
.api-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.api-table th {
  text-align: left; font-family: var(--font-mono); font-size: 10px; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-3);
  padding: 0 12px 8px 0; border-bottom: 1px solid var(--line-strong);
}
.th-zh { margin-left: 6px; }
.api-table td { padding: 10px 12px 10px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
.api-table .sym { color: var(--accent); font-size: 12.5px; }
.api-table .note { color: var(--ink-2); font-size: 13px; line-height: 1.55; }
.api-table .mono { font-size: 12.5px; }

/* ---------- related ---------- */
.rel-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.rel-card {
  display: flex; flex-direction: column; gap: 4px; padding: 14px 16px;
  border: 1px solid var(--line); border-radius: 10px; background: var(--paper-raised);
  color: var(--ink); transition: border-color 150ms var(--ease-out);
}
.rel-card:hover { border-color: var(--line-strong); color: var(--ink); }
.rel-name { font-size: 13.5px; font-weight: 550; display: flex; flex-direction: column; }
.rel-name-zh { font-size: 12px; font-weight: 400; color: var(--ink-2); }
.rel-sym { font-family: var(--font-mono); font-size: 11px; color: var(--accent); }

/* ---------- guide pages ---------- */
.guide-sub { margin: 10px 0 0; color: var(--ink-3); }
.guide-para { max-width: 700px; margin: 14px 0 0; font-size: 15px; line-height: 1.75; color: var(--ink-2); }
.guide-para.lang-zh { margin-top: 4px; font-size: 14px; }
.equation {
  display: flex; flex-wrap: wrap; align-items: center; gap: 18px; margin: 26px 0 10px;
  padding: 22px 26px; background: var(--paper-raised); border: 1px solid var(--line); border-radius: var(--radius);
  width: fit-content;
}
.eq-side { display: flex; flex-direction: column; gap: 4px; }
.eq-side code { font-family: var(--font-mono); font-size: 17px; font-weight: 600; color: var(--ink); }
.eq-tag { font-family: var(--font-mono); font-size: 9.5px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--accent); }
.eq-op { font-family: var(--font-mono); font-size: 20px; color: var(--ink-3); }
.rules { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 16px; }
.rule { display: flex; gap: 14px; }
.rule-num {
  flex: none; width: 26px; height: 26px; border-radius: 8px; background: var(--accent-soft); color: var(--accent);
  font-family: var(--font-mono); font-size: 12px; display: flex; align-items: center; justify-content: center; margin-top: 2px;
}
.rule-title { margin: 0; font-size: 15px; font-weight: 600; }
.rule-title.lang-zh { font-size: 14px; font-weight: 500; }
.rule-body { margin: 4px 0 0; font-size: 14px; line-height: 1.7; color: var(--ink-2); }
.rule-body.lang-zh { font-size: 13.5px; }
.guide-prompt { margin-top: 18px; }
.prompt-label { margin: 0 0 8px; font-size: 13px; font-weight: 600; display: flex; flex-wrap: wrap; gap: 8px; align-items: baseline; }
.prompt-note { font-weight: 400; color: var(--ink-3); font-size: 12px; }
.confuse-list { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; }
.confuse { padding: 14px 0; border-top: 1px solid var(--line); }
.confuse:first-child { border-top: 0; padding-top: 0; }
.confuse-term { font-size: 14.5px; font-weight: 600; }
.confuse-body { margin: 4px 0 0; font-size: 14px; line-height: 1.7; color: var(--ink-2); }
.confuse-body.lang-zh { font-size: 13.5px; }
.faq { border-top: 1px solid var(--line); padding: 14px 0; }
.faq summary { cursor: pointer; font-size: 14.5px; font-weight: 600; list-style: none; }
.faq summary::before { content: "+"; color: var(--accent); font-family: var(--font-mono); margin-right: 10px; }
.faq[open] summary::before { content: "–"; }
.faq-a { margin: 10px 0 0; font-size: 14px; line-height: 1.7; color: var(--ink-2); padding-left: 22px; }
.faq-a.lang-zh { font-size: 13.5px; }
.guide-outro { margin-top: 40px; padding: 18px 20px; background: var(--accent-soft); border-radius: var(--radius); font-size: 14px; line-height: 1.7; }
.guide-outro.lang-zh { margin-top: 6px; padding-top: 0; background: transparent; font-size: 13.5px; }
[data-lang-mode="en"] .guide-outro.lang-zh { display: none; }
[data-lang-mode="zh"] .guide-outro.lang-zh { background: var(--accent-soft); padding: 18px 20px; margin-top: 40px; color: var(--ink); }

/* ---------- translate table ---------- */
.table-search { margin: 10px 0 18px; }
.thing-link { text-decoration: underline; text-underline-offset: 3px; }
.table-note { display: block; font-size: 11.5px; color: var(--ink-3); margin-top: 2px; }
.translate-table td { font-size: 13px; }
.translate-table .mono { overflow-wrap: anywhere; }
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.table-scroll table { min-width: 620px; }

/* ---------- definition popover ---------- */
.def-pop {
  position: fixed; z-index: 100; max-width: 320px;
  background: var(--paper-raised); border: 1px solid var(--line); border-radius: 12px;
  box-shadow: var(--shadow-pop); padding: 14px 16px;
}
.def-word { font-family: var(--font-mono); font-size: 13px; font-weight: 600; color: var(--accent); }
.def-body { margin-top: 6px; font-size: 13px; line-height: 1.6; color: var(--ink); }
.def-src { margin-top: 8px; font-family: var(--font-mono); font-size: 9.5px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-3); }

/* ---------- responsive ---------- */
@media (max-width: 760px) {
  .wrap { padding: 0 16px; }
  .header-in { gap: 12px; }
  .site-nav { display: none; }
  .hero { padding-top: 44px; }
  .grid { grid-template-columns: 1fr; gap: 16px; }
  .stage-card { height: 180px; }
  .stage-detail { height: 300px; }
  .meta-row { grid-template-columns: 1fr; gap: 2px; }
  .part-api { margin-left: 0; }
  .copy-text p { padding-right: 0; padding-top: 30px; }
  .controls { gap: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001s !important; transition-duration: 0.001s !important; }
}