/* Learn UI Name · 界面叫啥 — Vercel-style black & white. 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;

  /* Vercel/Geist light scale */
  --bg: #ffffff;
  --bg-2: #fafafa;
  --fill: #f5f5f5;
  --line: #eaeaea;
  --line-strong: #d4d4d4;
  --gray-400: #a3a3a3;
  --gray-500: #737373;
  --gray-600: #525252;
  --gray-700: #404040;
  --fg: #0a0a0a;
  --blue: #0070f3;
  --blue-soft: rgba(0, 112, 243, 0.14);
  --ring: rgba(0, 112, 243, 0.28);

  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --shadow-pop: 0 8px 30px rgba(0, 0, 0, 0.12);
  --radius: 8px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  text-wrap: pretty;
}
::selection { background: var(--fg); color: var(--bg); }

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
nav a, .crumbs a, .card, .guide-card, .rel-card, .style-card { text-decoration: none; }
nav a:hover, .crumbs a:hover { text-decoration: none; }

:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; border-radius: 4px; }

.wrap { max-width: 1080px; 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(--gray-600); }
[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; }

mark { background: var(--blue-soft); color: inherit; border-radius: 2px; padding: 0 1px; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px) saturate(1.8);
  -webkit-backdrop-filter: blur(12px) saturate(1.8);
  border-bottom: 1px solid var(--line);
}
.header-in { display: flex; align-items: center; gap: 24px; height: 56px; }
.wordmark {
  font-family: var(--font-mono); font-weight: 600; font-size: 14.5px;
  color: var(--fg); letter-spacing: -0.02em; white-space: nowrap;
}
.wordmark:hover { color: var(--fg); text-decoration: none; }
.wordmark-zh { margin-left: 8px; font-size: 12px; color: var(--gray-400); font-weight: 400; }
.site-nav { display: flex; gap: 20px; margin-left: auto; overflow-x: auto; scrollbar-width: none; }
.site-nav::-webkit-scrollbar { display: none; }
.site-nav a {
  font-size: 13.5px; color: var(--gray-600); display: inline-flex; align-items: baseline; gap: 5px;
  white-space: nowrap; transition: color 120ms var(--ease-out);
}
.site-nav a:hover { color: var(--fg); }
.nav-zh { font-size: 11.5px; color: var(--gray-400); }
.lang-switch { display: flex; flex: none; border: 1px solid var(--line); border-radius: 6px; overflow: hidden; background: var(--bg); }
.ls-btn {
  border: 0; background: transparent; padding: 4px 10px; font-size: 12px;
  font-family: var(--font-sans); color: var(--gray-600); cursor: pointer;
  transition: background-color 120ms var(--ease-out), color 120ms var(--ease-out);
}
.ls-btn + .ls-btn { border-left: 1px solid var(--line); }
.ls-btn:hover { background: var(--fill); }
.ls-btn.active { background: var(--fg); color: var(--bg); font-weight: 500; }

/* ---------- hero ---------- */
.hero { padding: 72px 0 8px; }
.hero-title {
  margin: 0; font-size: clamp(40px, 6vw, 64px); font-weight: 600;
  letter-spacing: -0.045em; line-height: 1.04; color: var(--fg); text-wrap: balance;
}
.hero-title-zh { display: block; margin-top: 10px; font-size: 0.44em; font-weight: 500; letter-spacing: -0.01em; color: var(--gray-500); }
[data-lang-mode="zh"] .hero-title-zh { font-size: 0.75em; margin-top: 0; color: var(--fg); letter-spacing: -0.03em; }
.hero-sub { max-width: 640px; margin: 20px 0 0; font-size: 15.5px; line-height: 1.75; color: var(--gray-600); }
.hero-sub.lang-zh { margin-top: 6px; font-size: 14px; color: var(--gray-500); }
[data-lang-mode="zh"] .hero-sub.lang-zh { color: var(--gray-600); }
.vibe-promo { margin: 20px 0 0; font-size: 13.5px; display: flex; align-items: center; gap: 8px; }
.vibe-promo a { color: var(--fg); font-weight: 500; border-bottom: 1px solid var(--line-strong); }
.vibe-promo a:hover { border-color: var(--fg); text-decoration: none; }

/* ---------- controls ---------- */
.hero .controls { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 32px; }
.search-box {
  display: flex; align-items: center; gap: 8px; flex: 1; min-width: 240px; max-width: 440px;
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 0 12px; height: 40px; color: var(--gray-400);
  transition: border-color 120ms var(--ease-out), box-shadow 120ms var(--ease-out);
}
.search-box:focus-within { border-color: var(--fg); box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.06); }
.search-box input { flex: 1; border: 0; outline: 0; background: transparent; font: inherit; font-size: 14px; color: var(--fg); min-width: 0; }
.search-box input::placeholder { color: var(--gray-400); }
.search-box input::-webkit-search-cancel-button { -webkit-appearance: none; }
.search-kbd {
  flex: none; font-family: var(--font-mono); font-size: 10.5px; color: var(--gray-400);
  border: 1px solid var(--line); border-radius: 4px; padding: 1px 5px; background: var(--bg-2);
}
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid var(--line); border-radius: 6px; background: var(--bg);
  padding: 0 14px; height: 40px; font: inherit; font-size: 13.5px; color: var(--fg);
  cursor: pointer; transition: border-color 120ms var(--ease-out), background-color 120ms var(--ease-out), transform 60ms var(--ease-out);
}
.btn:hover { border-color: var(--gray-400); }
.btn:active { transform: scale(0.97); }
.tabs { display: flex; border: 1px solid var(--line); border-radius: 6px; overflow: hidden; background: var(--bg); height: 40px; }
.tab {
  border: 0; background: transparent; padding: 0 16px; font: inherit;
  font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.06em; font-size: 11px;
  color: var(--gray-600); cursor: pointer; transition: background-color 120ms var(--ease-out), color 120ms var(--ease-out);
}
.tab + .tab { border-left: 1px solid var(--line); }
.tab:hover { background: var(--fill); }
.tab.active { background: var(--fg); color: var(--bg); }
.count-note { margin: 0 0 0 auto; font-size: 12.5px; color: var(--gray-400); }
.count-note .lang-zh { margin-left: 8px; color: var(--gray-400); }

/* ---------- specimen grid ---------- */
.grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px 24px; padding: 32px 0 48px;
}
.card { display: block; border-radius: var(--radius); outline-offset: 4px; color: var(--fg); }
.card:hover { text-decoration: none; }
.stage {
  position: relative; overflow: hidden; border: 1px solid var(--line);
  border-radius: var(--radius); background: var(--bg-2);
  transition: border-color 160ms var(--ease-out);
}
.stage-card { height: 200px; }
.card:hover .stage { border-color: var(--gray-400); }
.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: 14px 2px 0; }
.card-name { margin: 0; font-size: 14.5px; font-weight: 500; line-height: 1.4; letter-spacing: -0.01em; display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px; }
.card-name-zh { font-size: 12.5px; font-weight: 400; color: var(--gray-500); }
.card-symbol { margin: 4px 0 0; font-family: var(--font-mono); font-size: 11px; color: var(--gray-500); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.card-tag { margin: 6px 0 0; font-size: 13px; line-height: 1.55; color: var(--gray-600); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-tag.lang-zh { font-size: 12.5px; margin-top: 2px; color: var(--gray-500); }
.card-match { margin: 6px 0 0; font-size: 11.5px; color: var(--gray-500); font-family: var(--font-mono); }
.card-match mark { font-family: inherit; }
.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(--blue); margin-left: 6px; }
.tag-platform { color: var(--gray-400); margin-left: auto; }
.entry-title .tag-platform { margin-left: 12px; }

.no-result { padding: 48px 0 64px; text-align: center; color: var(--gray-600); font-size: 14px; }
.no-result .lang-zh { display: block; margin-top: 4px; font-size: 13.5px; color: var(--gray-500); }
.no-result-examples { margin-top: 14px; display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.no-result-examples button {
  border: 1px solid var(--line); background: var(--bg); border-radius: 999px; padding: 4px 12px;
  font: inherit; font-size: 12.5px; color: var(--gray-600); cursor: pointer;
}
.no-result-examples button:hover { border-color: var(--gray-400); color: var(--fg); }

/* ---------- guides / sections ---------- */
.guides { padding: 24px 0 80px; border-top: 1px solid var(--line); }
.section-title { margin: 40px 0 20px; font-family: var(--font-mono); font-size: 11px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.12em; color: var(--gray-400); }
.section-title .lang-zh { margin-left: 10px; letter-spacing: 0.06em; color: var(--gray-400); }
.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(--bg);
  color: var(--fg); transition: border-color 120ms var(--ease-out);
}
.guide-card:hover { border-color: var(--gray-400); color: var(--fg); text-decoration: none; }
.guide-kind { font-family: var(--font-mono); font-size: 9.5px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--gray-400); }
.guide-title { font-size: 15.5px; font-weight: 600; letter-spacing: -0.015em; }
.guide-desc { font-size: 13px; line-height: 1.6; color: var(--gray-600); }
.guide-desc.lang-zh { font-size: 12.5px; color: var(--gray-500); }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); margin-top: 24px; }
.footer-in { padding: 28px 24px 40px; font-size: 12.5px; color: var(--gray-600); display: flex; flex-direction: column; gap: 6px; }
.footer-in p { margin: 0; }
.foot-src { color: var(--gray-400); }
.foot-src a, .foot-note a { color: var(--gray-600); text-decoration: underline; text-underline-offset: 3px; }
.foot-src a:hover, .foot-note a:hover { color: var(--fg); }
.foot-links { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.foot-links a { color: var(--gray-600); }
.foot-links a:hover { color: var(--fg); text-decoration: none; }
.foot-links .sep { color: var(--line-strong); }

/* ---------- entry page ---------- */
.entry { padding-bottom: 80px; }
.crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 24px 0 0; font-size: 13px; color: var(--gray-400); }
.crumbs .lang-zh { margin-left: 3px; }
.crumbs a { color: var(--gray-600); }
.crumbs a:hover { color: var(--fg); }
.crumb-sep { color: var(--line-strong); }
.crumb-cur { color: var(--fg); }
.entry-head { padding: 24px 0 28px; }
.entry-title {
  margin: 0; font-size: clamp(28px, 3.6vw, 40px); font-weight: 600; letter-spacing: -0.03em;
  line-height: 1.12; text-wrap: balance; display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px; color: var(--fg);
}
.entry-title-zh { font-size: 0.5em; font-weight: 500; color: var(--gray-500); letter-spacing: 0; }
[data-lang-mode="zh"] .entry-title-zh { font-size: 0.75em; color: var(--fg); letter-spacing: -0.02em; }
.entry-tag { margin: 14px 0 0; font-size: 16px; line-height: 1.7; color: var(--gray-600); max-width: 720px; }
.entry-tag.lang-zh { margin-top: 4px; font-size: 14.5px; color: var(--gray-500); }
[data-lang-mode="zh"] .entry-tag.lang-zh { color: var(--gray-600); }
.entry-meta { margin: 24px 0 0; display: flex; flex-direction: column; gap: 14px; }
.meta-row { display: grid; grid-template-columns: 160px 1fr; gap: 16px; align-items: start; }
.meta-row dt { font-family: var(--font-mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--gray-400); padding-top: 4px; }
.dt-zh { display: block; letter-spacing: 0.05em; color: var(--gray-400); }
.meta-row dd { margin: 0; font-size: 13.5px; color: var(--gray-600); }
.fuzzy-list { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 4px; }
.stage-detail { height: 400px; background: var(--bg-2); }
.stage-hint { margin: 10px 2px 0; font-size: 12px; color: var(--gray-400); }

/* ---------- sections ---------- */
.sect { margin-top: 48px; 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: 20px 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(--fg);
  border: 1px solid var(--line); background: var(--fill);
  width: 20px; height: 20px; border-radius: 5px; display: inline-flex; align-items: center; justify-content: center;
  align-self: center;
}
.part-name { font-size: 15px; font-weight: 600; letter-spacing: -0.01em; display: inline-flex; flex-wrap: wrap; gap: 8px; align-items: baseline; }
.part-name-zh { font-size: 13px; font-weight: 400; color: var(--gray-500); }
.part-api { font-family: var(--font-mono); font-size: 11.5px; color: var(--gray-500); margin-left: auto; }
.part-desc { margin: 8px 0 0; font-size: 14px; line-height: 1.75; color: var(--gray-600); }
.part-desc.lang-zh { margin-top: 3px; font-size: 13.5px; color: var(--gray-500); }
[data-lang-mode="zh"] .part-desc.lang-zh { color: var(--gray-600); }
.part-prompt { margin-top: 12px; padding: 12px 14px; background: var(--bg-2); border: 1px solid var(--line); border-radius: 6px; }
.part-prompt-label { font-family: var(--font-mono); font-size: 9.5px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--gray-400); display: flex; gap: 8px; }
.part-prompt p { margin: 6px 0 0; color: var(--gray-600); }

/* ---------- copy blocks ---------- */
.copy-block { position: relative; background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 16px 14px; }
.btn-copy { position: absolute; top: 10px; right: 10px; height: 28px; padding: 0 10px; font-size: 12px; border-radius: 5px; }
.btn-copy.done { border-color: var(--fg); }
.copy-text p { margin: 0; font-family: var(--font-mono); font-size: 12.5px; line-height: 1.8; color: var(--fg); padding-right: 64px; white-space: pre-wrap; }
.copy-text .zh-copy { margin-top: 10px; padding-top: 10px; border-top: 1px dashed var(--line-strong); color: var(--gray-600); 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(--gray-400);
  padding: 0 12px 10px 0; border-bottom: 1px solid var(--line-strong);
}
.th-zh { margin-left: 6px; color: var(--gray-400); }
.api-table td { padding: 12px 12px 12px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
.api-table .sym { color: var(--gray-600); font-size: 12.5px; }
.api-table .note { color: var(--gray-600); font-size: 13px; line-height: 1.6; }
.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: var(--radius); background: var(--bg);
  color: var(--fg); transition: border-color 120ms var(--ease-out);
}
.rel-card:hover { border-color: var(--gray-400); color: var(--fg); text-decoration: none; }
.rel-name { font-size: 13.5px; font-weight: 500; display: flex; flex-direction: column; }
.rel-name-zh { font-size: 12px; font-weight: 400; color: var(--gray-500); }
.rel-sym { font-family: var(--font-mono); font-size: 11px; color: var(--gray-500); }

/* ---------- guide pages ---------- */
.guide-sub { margin: 10px 0 0; color: var(--gray-400); }
.guide-para { max-width: 700px; margin: 14px 0 0; font-size: 15px; line-height: 1.8; color: var(--gray-600); }
.guide-para.lang-zh { margin-top: 4px; font-size: 14px; color: var(--gray-500); }
[data-lang-mode="zh"] .guide-para.lang-zh { color: var(--gray-600); }
.equation {
  display: flex; flex-wrap: wrap; align-items: center; gap: 18px; margin: 28px 0 10px;
  padding: 24px 28px; background: var(--bg); 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(--fg); }
.eq-tag { font-family: var(--font-mono); font-size: 9.5px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--gray-400); }
.eq-op { font-family: var(--font-mono); font-size: 20px; color: var(--gray-400); }
.rules { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 18px; }
.rule { display: flex; gap: 14px; }
.rule-num {
  flex: none; width: 26px; height: 26px; border-radius: 6px; background: var(--fill); color: var(--fg);
  border: 1px solid var(--line);
  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; letter-spacing: -0.01em; }
.rule-title.lang-zh { font-size: 14px; font-weight: 500; color: var(--gray-600); }
[data-lang-mode="zh"] .rule-title.lang-zh { color: var(--fg); }
.rule-body { margin: 4px 0 0; font-size: 14px; line-height: 1.75; color: var(--gray-600); }
.rule-body.lang-zh { font-size: 13.5px; color: var(--gray-500); }
[data-lang-mode="zh"] .rule-body.lang-zh { color: var(--gray-600); }
.guide-prompt { margin-top: 20px; }
.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(--gray-400); font-size: 12px; }
.confuse-list { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; }
.confuse { padding: 16px 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: 1.75; color: var(--gray-600); }
.confuse-body.lang-zh { font-size: 13.5px; color: var(--gray-500); }
[data-lang-mode="zh"] .confuse-body.lang-zh { color: var(--gray-600); }
.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(--gray-400); font-family: var(--font-mono); margin-right: 10px; }
.faq[open] summary::before { content: "–"; }
.faq-a { margin: 10px 0 0; font-size: 14px; line-height: 1.75; color: var(--gray-600); padding-left: 22px; }
.faq-a.lang-zh { font-size: 13.5px; color: var(--gray-500); }
[data-lang-mode="zh"] .faq-a.lang-zh { color: var(--gray-600); }
.guide-outro { margin-top: 44px; padding: 18px 20px; background: var(--fill); border-radius: var(--radius); font-size: 14px; line-height: 1.75; color: var(--gray-700); }
.guide-outro.lang-zh { margin-top: 6px; padding-top: 0; background: transparent; font-size: 13.5px; color: var(--gray-500); }
[data-lang-mode="en"] .guide-outro.lang-zh { display: none; }
[data-lang-mode="zh"] .guide-outro.lang-zh { background: var(--fill); padding: 18px 20px; margin-top: 44px; color: var(--gray-700); }

/* ---------- translate table ---------- */
.table-search { margin: 10px 0 20px; }
.thing-link { text-decoration: underline; text-underline-offset: 3px; color: var(--fg); }
.thing-link:hover { color: var(--blue); }
.table-note { display: block; font-size: 11.5px; color: var(--gray-400); 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 .translate-table { min-width: 620px; }

/* ---------- styles atlas (Name That Vibe) ---------- */
.atlas-note {
  margin: 28px 0 0; padding: 18px 20px; border: 1px solid var(--line);
  border-radius: var(--radius); background: var(--bg); max-width: 720px;
}
.atlas-note h2 { margin: 0; font-size: 14.5px; font-weight: 600; letter-spacing: -0.01em; }
.atlas-note p { margin: 6px 0 0; font-size: 13px; line-height: 1.65; color: var(--gray-600); }
.atlas-note .lang-zh { color: var(--gray-500); }
.research-chips { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 6px; }
.research-chips span {
  font-size: 11.5px; color: var(--gray-500); border: 1px dashed var(--line-strong);
  border-radius: 999px; padding: 2px 10px;
}
.style-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px 24px; padding: 32px 0 56px;
}
.style-card { display: block; border-radius: var(--radius); outline-offset: 4px; color: var(--fg); }
.style-card:hover { text-decoration: none; }
.style-card .stage-card { height: 220px; }
.style-card:hover .stage { border-color: var(--gray-400); }
.style-era { font-family: var(--font-mono); font-size: 10.5px; color: var(--gray-400); }

.alias-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.alias-chip {
  display: inline-flex; flex-direction: column; gap: 1px;
  background: var(--bg-2); border: 1px solid var(--line); border-radius: 6px; padding: 6px 10px;
  font-size: 12.5px; line-height: 1.45; color: var(--gray-700);
}
.alias-chip .lang-zh { font-size: 12px; color: var(--gray-500); }

.dna { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; }
.dna-item { padding: 16px 0; border-top: 1px solid var(--line); }
.dna-item:first-child { border-top: 0; padding-top: 0; }
.dna-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px; }
.dna-name { font-size: 14.5px; font-weight: 600; letter-spacing: -0.01em; }
.dna-name-zh { font-size: 12.5px; font-weight: 400; color: var(--gray-500); }
.dna-facet { font-family: var(--font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--gray-400); }
.dna-role {
  font-family: var(--font-mono); font-size: 9px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.1em;
  border-radius: 4px; padding: 2px 6px; margin-left: auto;
}
.dna-role-defining { background: var(--fg); color: var(--bg); }
.dna-role-supporting { border: 1px solid var(--line-strong); color: var(--gray-600); }
.dna-role-variable { border: 1px dashed var(--line-strong); color: var(--gray-500); }
.dna-role-avoid { border: 1px solid var(--line-strong); color: var(--gray-400); text-decoration: line-through; }
.dna-desc { margin: 6px 0 0; font-size: 13.5px; line-height: 1.7; color: var(--gray-600); }
.dna-desc.lang-zh { margin-top: 2px; font-size: 13px; color: var(--gray-500); }
[data-lang-mode="zh"] .dna-desc.lang-zh { color: var(--gray-600); }

.vs-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.vs-cell .stage { height: 240px; }
.vs-cell-label { margin: 10px 2px 0; font-size: 13px; font-weight: 600; }
.vs-cell-label .lang-zh { font-weight: 400; font-size: 12px; color: var(--gray-500); margin-left: 6px; }
.vs-why { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 16px; }
.vs-why-card { border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; background: var(--bg); }
.vs-why-card p { margin: 0; font-size: 13px; line-height: 1.65; color: var(--gray-700); }
.vs-why-card p.lang-zh { margin-top: 4px; font-size: 12.5px; color: var(--gray-500); }
[data-lang-mode="zh"] .vs-why-card p.lang-zh { color: var(--gray-700); }

.code-block { position: relative; margin-top: 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-2); }
.code-block pre {
  margin: 0; padding: 14px 16px; overflow-x: auto;
  font-family: var(--font-mono); font-size: 12px; line-height: 1.75; color: var(--gray-700);
}
.code-block .btn-copy { top: 8px; right: 8px; }
.code-title { padding: 10px 16px 0; font-size: 12px; font-weight: 600; color: var(--gray-600); }

/* ---------- definition popover ---------- */
.def-pop {
  position: fixed; z-index: 100; max-width: 320px;
  background: var(--bg); border: 1px solid var(--line); border-radius: 10px;
  box-shadow: var(--shadow-pop); padding: 14px 16px;
}
.def-word { font-family: var(--font-mono); font-size: 13px; font-weight: 600; color: var(--fg); }
.def-body { margin-top: 6px; font-size: 13px; line-height: 1.6; color: var(--gray-700); white-space: pre-line; }
.def-src { margin-top: 8px; font-family: var(--font-mono); font-size: 9.5px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--gray-400); }

/* ---------- responsive ---------- */
@media (max-width: 760px) {
  .wrap { padding: 0 16px; }
  .header-in { gap: 12px; }
  .wordmark-zh { display: none; }
  .site-nav { gap: 14px; }
  .nav-zh { display: none; }
  .hero { padding-top: 48px; }
  .grid, .style-grid { grid-template-columns: 1fr; gap: 20px; }
  .stage-card { height: 180px; }
  .stage-detail { height: 320px; }
  .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; }
  .count-note { margin-left: 0; width: 100%; }
  .search-kbd { display: none; }
  .vs-pair, .vs-why { grid-template-columns: 1fr; }
  .vibe-promo { flex-direction: column; align-items: flex-start; gap: 6px; }
}

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