/*!
 * assets/styles.css — 桌面 / 窄屏（720px / 480px 断点）/ 打印样式
 * 系统字体、中文高信息密度布局；无 Web 字体、无外链资源。
 */

:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --surface-2: #fafbfc;
  --ink: #16202b;
  --ink-2: #46566a;
  --ink-3: #6b7a8c;
  --line: #e0e6ed;
  --line-strong: #c9d3de;
  --accent: #0b6b63;
  --accent-2: #084f49;
  --accent-soft: #e3f2ef;
  --warn: #8a5a00;
  --warn-soft: #fdf3e0;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 8px 24px rgba(16, 24, 40, .05);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

img, svg, video, canvas { max-width: 100%; height: auto; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  overflow-wrap: break-word;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, select:focus-visible, input:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

h1, h2, h3, h4 { line-height: 1.3; margin: 0 0 .4em; font-weight: 650; }
p { margin: 0 0 .8em; }

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", monospace;
  font-size: .92em;
  background: #eef2f6;
  padding: 1px 5px;
  border-radius: 4px;
}

mark {
  background: #ffe9a8;
  color: inherit;
  padding: 0 1px;
  border-radius: 2px;
}

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

.skip-link {
  position: absolute;
  left: 8px; top: -48px;
  z-index: 100;
  padding: 8px 14px;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  transition: top .15s ease;
}
.skip-link:focus { top: 8px; }

/* ── 页头 ───────────────────────────────────────────────────────── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: saturate(1.2) blur(6px);
}

.header-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
}

.brand { flex: 0 0 auto; }
.brand-link { display: flex; align-items: center; gap: 10px; color: var(--ink); }
.brand-link:hover { text-decoration: none; }

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px; height: 34px;
  border-radius: 9px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 17px;
}

.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-name { font-weight: 700; font-size: 16px; }
.brand-sub { font-size: 12px; color: var(--ink-3); }

.site-nav { display: flex; flex-wrap: wrap; gap: 4px 16px; flex: 1 1 auto; }
.site-nav a {
  color: var(--ink-2);
  font-size: 14.5px;
  padding: 5px 2px;
  border-bottom: 2px solid transparent;
}
.site-nav a:hover { color: var(--accent-2); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--accent-2); border-bottom-color: var(--accent); font-weight: 600; }

.search {
  display: flex;
  gap: 8px;
  flex: 0 1 380px;
  min-width: 240px;
  margin: 0;
}

.search-input {
  flex: 1 1 auto;
  min-width: 0;
  padding: 9px 12px;
  font-size: 14px;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  font-family: inherit;
}
.search-input::placeholder { color: var(--ink-3); }
.search-input:focus { border-color: var(--accent); outline: 2px solid rgba(11, 107, 99, .18); outline-offset: 0; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 16px;
  font-size: 14px;
  font-family: inherit;
  line-height: 1.2;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  cursor: pointer;
  white-space: nowrap;
}
.btn:hover { border-color: var(--accent); color: var(--accent-2); text-decoration: none; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-2); border-color: var(--accent-2); color: #fff; }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-search { padding: 9px 14px; }
.is-disabled { opacity: .45; pointer-events: none; }

/* ── 主区域 ─────────────────────────────────────────────────────── */

main {
  max-width: 1180px;
  margin: 0 auto;
  padding: 26px 20px 64px;
  outline: none;
}

.view { animation: fade-in .18s ease-out; }
@keyframes fade-in { from { opacity: .55; } to { opacity: 1; } }
@media (prefers-reduced-motion: reduce) {
  .view { animation: none; }
  .skip-link { transition: none; }
}

.boot-panel { padding: 72px 8px; text-align: center; }
.boot-title { font-size: 18px; font-weight: 600; }

.muted { color: var(--ink-3); }
.small { font-size: 13px; }
.label { display: inline-block; margin-right: 8px; color: var(--ink-3); font-size: 13px; font-weight: 600; }

/* ── 首页 hero ──────────────────────────────────────────────────── */

.hero {
  padding: 34px 34px 30px;
  background: linear-gradient(135deg, #eef7f4 0%, #eaf1f8 60%, #f7f4ec 100%);
  border: 1px solid var(--line);
  border-radius: 16px;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--accent-2);
  font-weight: 600;
}

.hero-title { font-size: clamp(1.7rem, 3.4vw, 2.4rem); margin-bottom: 10px; letter-spacing: -.01em; }
.hero-lede { max-width: 760px; color: var(--ink-2); margin-bottom: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }

.home-links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }

/* ── 统计条 ─────────────────────────────────────────────────────── */

.stat-bar {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 20px 0;
  padding: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.stat { padding: 14px 18px; border-left: 1px solid var(--line); }
.stat:first-child { border-left: 0; }
.stat-num { display: block; font-size: 24px; font-weight: 700; color: var(--accent-2); letter-spacing: -.01em; }
.stat-label { display: block; font-size: 13px; color: var(--ink-3); }

/* ── 区块与卡片 ─────────────────────────────────────────────────── */

.section { margin-top: 30px; }
.section-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 8px 16px; margin-bottom: 12px; }
.section-title { font-size: 20px; margin: 0; }
.section-note { color: var(--ink-3); font-size: 13.5px; margin-bottom: 12px; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(248px, 1fr));
  gap: 14px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 16px 12px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.card:hover { border-color: var(--line-strong); }

.domain-card-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; }
.domain-name { font-size: 17px; margin: 0; }
.domain-name a { color: var(--ink); }
.domain-stats { margin: 0; font-size: 13.5px; color: var(--ink-2); display: flex; gap: 6px; flex-wrap: wrap; }
.dot { color: var(--line-strong); }
.domain-types { margin: 0; font-size: 12.5px; color: var(--ink-3); }
.domain-links { display: flex; gap: 14px; font-size: 13px; margin-top: auto; padding-top: 4px; }

.badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: 12px;
  line-height: 1.5;
  border-radius: 6px;
  background: #eef1f5;
  color: var(--ink-2);
  white-space: nowrap;
}
.badge-soft { background: var(--accent-soft); color: var(--accent-2); }
.badge-link { background: var(--accent-soft); color: var(--accent-2); }
.badge-warn { background: var(--warn-soft); color: var(--warn); }
.badge-ref { background: #eef1f5; color: var(--ink-2); }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-2);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  cursor: pointer;
}
.chip:hover { border-color: var(--accent); color: var(--accent-2); text-decoration: none; }
.chip-static { cursor: default; background: var(--surface-2); }
.chip-static:hover { border-color: var(--line-strong); color: var(--ink-2); }
.chip.is-on { background: var(--accent); border-color: var(--accent); color: #fff; }

.tag-row { display: flex; flex-wrap: wrap; gap: 6px; }
.tag-row-wrap { margin: 4px 0 10px; }

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
}

.scenario-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  color: var(--ink);
}
.scenario-card:hover { border-color: var(--accent); text-decoration: none; }
.scenario-text { font-size: 14px; color: var(--ink); }
.scenario-meta { font-size: 12.5px; color: var(--ink-3); }

/* ── 典型问题场景（症状向导） ───────────────────────────────────── */

.scene-section { margin: 4px 0 18px; }
.scene-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 10px;
}
.scene-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--line-strong);
  border-radius: 10px;
  color: var(--ink);
}
.scene-card:hover { border-color: var(--accent); text-decoration: none; }
.scene-card.is-on { border-color: var(--accent); border-left-color: var(--accent); background: var(--accent-soft); }
.scene-title { font-weight: 650; font-size: 15px; }
.scene-question { font-size: 13px; color: var(--ink-2); }
.scene-meta { font-size: 12.5px; color: var(--ink-3); }

.scene-panel {
  background: var(--surface);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin: 0 0 22px;
  box-shadow: var(--shadow);
}
.scene-panel-title { font-size: 19px; margin-bottom: 4px; }
.scene-panel-q { color: var(--ink-2); font-size: 14px; margin-bottom: 6px; }
.scene-panel-meta { color: var(--ink-3); font-size: 13px; }
.rec-list { list-style: none; margin: 10px 0 0; padding: 0; }
.rec-item { padding: 14px 0; border-top: 1px solid var(--line); }
.rec-head { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.rec-rank { font-size: 12.5px; color: #fff; background: var(--accent); border-radius: 999px; padding: 2px 9px; }
.rec-name { font-weight: 650; font-size: 16px; }
.rec-why { margin: 8px 0 0; padding-left: 20px; color: var(--ink-2); font-size: 13.5px; }
.rec-why li { margin-bottom: 3px; }
.rec-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }

/* ── 让路 / 头部 / 筛选 ─────────────────────────────────────────── */

.crumb { display: flex; flex-wrap: wrap; gap: 6px; font-size: 13px; color: var(--ink-3); margin-bottom: 12px; }
.crumb a { color: var(--ink-3); }
.crumb a:hover { color: var(--accent-2); }
.crumb-sep { color: var(--line-strong); }
.crumb-current { color: var(--ink-2); }

.page-head { margin-bottom: 6px; }
.page-head h1 { font-size: clamp(1.5rem, 2.8vw, 1.95rem); margin-bottom: 6px; }
.page-sub { color: var(--ink-2); font-size: 14.5px; margin-bottom: 6px; max-width: 900px; }
.page-meta { color: var(--ink-3); font-size: 13px; }
.title-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  margin: 16px 0 18px;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 14px;
}
.filter { display: inline-flex; align-items: center; gap: 8px; color: var(--ink-3); }
.filter > span { font-size: 13px; }
.filter.grow { flex: 1 1 260px; }
.filter-label { color: var(--ink-3); font-size: 13px; }

.select, .input {
  padding: 7px 10px;
  font-size: 14px;
  font-family: inherit;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
}
.input { width: 100%; min-width: 0; }
.select:focus, .input:focus { border-color: var(--accent); outline: 2px solid rgba(11, 107, 99, .16); outline-offset: 0; }

.link { font-size: 13.5px; color: var(--accent-2); }
.link-more { font-size: 14px; }
.link-more:hover { text-decoration: underline; }

.result-count { color: var(--ink-2); font-size: 14px; margin: 4px 0 12px; }

/* ── 检索结果 ───────────────────────────────────────────────────── */

.result-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }

.result-item {
  display: block;
  padding: 16px 14px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  border-radius: 8px;
}
.result-item:hover { background: var(--surface); text-decoration: none; }
.result-item.is-active { background: var(--surface); outline: 2px solid var(--accent); outline-offset: -2px; }

.result-title { font-size: 17px; margin: 0 0 4px; color: var(--ink); }
.result-sub { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 0 0 6px; }
.result-en { font-size: 12.5px; color: var(--ink-3); }
.result-snippet { margin: 0 0 6px; font-size: 14px; color: var(--ink-2); }
.result-field { margin: 0 0 6px; font-size: 12px; color: var(--ink-3); }
.result-meta { display: flex; flex-wrap: wrap; gap: 6px; margin: 0; font-size: 12.5px; color: var(--ink-3); }
.dots { margin-left: 4px; }

.more-row { display: flex; justify-content: center; margin: 22px 0 6px; }

/* ── 领域页 ─────────────────────────────────────────────────────── */

.quick-links { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 4px; }

.entry-list { list-style: none; margin: 6px 0 0; padding: 0; }
.entry-row {
  padding: 16px 4px;
  border-bottom: 1px solid var(--line);
}
.entry-row-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; }
.entry-row-title { font-size: 17px; margin: 0; }
.entry-row-en { font-size: 12.5px; color: var(--ink-3); margin: 2px 0 6px; }
.entry-row-def { font-size: 14px; color: var(--ink-2); margin: 0 0 6px; }
.entry-row-symptom { font-size: 13.5px; color: var(--ink-2); margin: 0 0 6px; }
.entry-row-meta { display: flex; flex-wrap: wrap; gap: 6px; font-size: 12.5px; color: var(--ink-3); margin: 0; }

/* ── 方法论详情 ─────────────────────────────────────────────────── */

.entry-head { padding-bottom: 14px; border-bottom: 2px solid var(--line); margin-bottom: 8px; }
.entry-head h1 { font-size: clamp(1.5rem, 3vw, 2.05rem); margin-bottom: 4px; }
.entry-en { color: var(--ink-3); font-size: 14px; margin-bottom: 10px; }
.entry-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 0 0 8px; }
.meta-text { font-size: 13px; color: var(--ink-3); }
.aliases { font-size: 13.5px; color: var(--ink-2); margin: 0; }

.section { margin-top: 28px; }
.section-title {
  font-size: 18px;
  padding-left: 10px;
  border-left: 4px solid var(--accent);
  margin-bottom: 12px;
}

.definition {
  font-size: 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin: 0;
}

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 3px solid var(--line-strong);
  border-radius: 10px;
  padding: 14px 16px;
}
.panel h3 { font-size: 15px; margin-bottom: 8px; }
.panel-ok { border-top-color: var(--accent); }
.panel-no { border-top-color: var(--warn); }
.panel ul { margin: 0; padding-left: 20px; }
.panel li { margin-bottom: 6px; font-size: 14px; }

.plain-list { margin: 0; padding-left: 20px; }
.plain-list li { margin-bottom: 6px; }
.model-list { padding-left: 18px; }
.model-list li { margin-bottom: 8px; }
.model-list strong { margin-right: 6px; }

.steps { list-style: none; counter-reset: step; margin: 0; padding: 0; }
.step {
  position: relative;
  counter-increment: step;
  padding: 12px 16px 12px 52px;
  margin-bottom: 10px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
}
.step::before {
  content: counter(step);
  position: absolute;
  left: 14px; top: 12px;
  width: 26px; height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-2);
  font-weight: 700;
  font-size: 13px;
}
.step-action { margin: 0 0 6px; }
.step-output { margin: 0; font-size: 13.5px; color: var(--ink-2); }

.model { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; }
.model-name { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: 16px; margin: 0 0 6px; }
.model-desc { color: var(--ink-2); font-size: 14.5px; margin-bottom: 12px; }
.model-note { font-size: 12.5px; color: var(--ink-3); margin: 8px 0 0; }

.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }

.matrix-table, .var-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  background: var(--surface);
}
.matrix-table th, .matrix-table td,
.var-table th, .var-table td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}
.matrix-table thead th, .var-table thead th {
  background: var(--surface-2);
  color: var(--ink-2);
  font-size: 12.5px;
  font-weight: 600;
  white-space: nowrap;
}
.matrix-table tbody th { width: 34%; color: var(--ink); font-weight: 600; }
.var-symbol { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; color: var(--accent-2); white-space: nowrap; }
.var-unit { color: var(--ink-3); white-space: nowrap; }

.flow { list-style: none; margin: 0; padding: 0; }
.flow-step {
  display: flex;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
}
.flow-step:last-child { border-bottom: 0; }
.flow-index {
  flex: 0 0 26px;
  width: 26px; height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 12.5px;
  font-weight: 700;
}
.flow-text { font-size: 14.5px; }

.formulas { display: flex; flex-direction: column; gap: 14px; }
.formula {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  scroll-margin-top: 90px;
}
.formula.is-target { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(11, 107, 99, .14); background: #f4fbf9; }
.formula-name { font-size: 15.5px; margin-bottom: 10px; }
.formula-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 10px; }
.formula-head .formula-name { margin-bottom: 0; }

.copy-btn { flex: 0 0 auto; }
.copy-btn.is-copied { border-color: var(--accent); color: var(--accent-2); background: var(--accent-soft); }

.domain-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.domain-table th, .domain-table td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.domain-table th { font-size: 13px; color: var(--ink-3); font-weight: 600; white-space: nowrap; }
.domain-table td.num { text-align: right; font-variant-numeric: tabular-nums; }
.domain-table tbody tr:hover { background: var(--surface-2); }

.expression {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", monospace;
  font-size: clamp(1.02rem, 2.2vw, 1.2rem);
  line-height: 1.65;
  letter-spacing: .01em;
  color: #0d2733;
  background: #f7fafc;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  padding: 13px 15px;
  margin: 0 0 12px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
  overflow-x: auto;
}
.expression-sm { font-size: 15px; border-left-width: 3px; padding: 10px 12px; }

.formula-notes { font-size: 13.5px; color: var(--ink-2); margin: 10px 0 0; }

.case { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; }
.case-head { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 8px; }
.case-title { font-size: 16.5px; margin: 0; }
.case-note { font-size: 12.5px; color: var(--warn); background: var(--warn-soft); border-radius: 6px; padding: 6px 10px; margin-bottom: 10px; }
.case-bg { font-size: 14.5px; color: var(--ink-2); }
.case-sub { font-size: 14px; margin: 12px 0 6px; }
.case-actions { margin: 0 0 12px; padding-left: 22px; }
.case-actions li { margin-bottom: 6px; font-size: 14px; }
.case-result { font-size: 14.5px; background: var(--surface-2); border-left: 3px solid var(--accent); padding: 10px 12px; border-radius: 0 6px 6px 0; }
.case-refs { margin: 10px 0 0; padding-left: 20px; font-size: 13px; color: var(--ink-3); }

.related-list { list-style: none; margin: 0; padding: 0; }
.related-list li { padding: 10px 0; border-bottom: 1px solid var(--line); }
.related-list li:last-child { border-bottom: 0; }
.related-head { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.related-reason { margin: 4px 0 0; font-size: 13.5px; color: var(--ink-2); }
.related-missing { margin: 0; color: var(--warn); font-size: 13.5px; }

.ref-list { list-style: none; margin: 0; padding: 0; }
.ref { padding: 12px 0; border-bottom: 1px solid var(--line); }
.ref:last-child { border-bottom: 0; }
.ref-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px; }
.ref-title { font-weight: 600; }
.ref-meta { margin: 4px 0 0; font-size: 13px; color: var(--ink-2); }
.ref-id { margin: 2px 0 0; font-size: 12.5px; color: var(--ink-3); font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }
.ref-loc { margin: 2px 0 0; font-size: 12.5px; color: var(--ink-3); }

.entry-footer { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--line); }

/* ── 公式速查 ───────────────────────────────────────────────────── */

.formula-list { display: flex; flex-direction: column; gap: 12px; }
.formula-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  box-shadow: var(--shadow);
}
.formula-card-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 8px; margin-bottom: 4px; }
.formula-card-name { font-size: 16.5px; margin: 0; }
.formula-card-name a { color: var(--ink); }
.formula-source { margin: 0 0 8px; font-size: 13px; color: var(--ink-3); }
.formula-vars { margin: 0 0 6px; font-size: 13px; color: var(--ink-2); }
.formula-card-foot { display: flex; justify-content: flex-end; }

.pager { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; margin-top: 22px; padding-top: 16px; border-top: 1px solid var(--line); }
.pager-info { font-size: 13.5px; color: var(--ink-3); }

/* ── 症状向导 ───────────────────────────────────────────────────── */

.pick-panel {
  margin: 18px 0;
  padding: 16px 18px;
  background: #f4fbf9;
  border: 1px solid #bfe0d9;
  border-radius: var(--radius);
}
.pick-title { font-size: 17px; margin-bottom: 10px; }
.pick-card { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; }
.pick-label { font-size: 12.5px; color: var(--ink-3); margin-bottom: 6px; }
.pick-symptom {
  margin: 0 0 10px;
  padding: 10px 14px;
  border-left: 4px solid var(--accent);
  background: var(--surface-2);
  border-radius: 0 6px 6px 0;
  font-size: 15px;
}
.pick-entry { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 6px; }
.pick-entry-name { font-size: 17px; font-weight: 650; }
.pick-def { font-size: 13.5px; color: var(--ink-2); }
.pick-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.pick-related { margin-top: 14px; }
.pick-related h3 { font-size: 14.5px; margin-bottom: 6px; }

.wizard-results { margin-top: 8px; }
.wizard-groups { display: flex; flex-direction: column; gap: 12px; }
.wizard-group {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
}
.wizard-group-head { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.wizard-group-title { font-size: 16px; margin: 0; }
.wizard-group-title a { color: var(--ink); }
.symptom-list { list-style: none; margin: 10px 0 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.symptom {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--ink-2);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.symptom:hover { border-color: var(--accent); background: #f4fbf9; color: var(--ink); text-decoration: none; }
.symptom.is-picked { border-color: var(--accent); background: var(--accent-soft); color: var(--ink); font-weight: 600; }
.symptom mark { background: #ffe9a8; }

/* ── 关于 ───────────────────────────────────────────────────────── */

.meta-list { display: grid; grid-template-columns: 190px 1fr; gap: 8px 16px; margin: 0; font-size: 14px; }
.meta-list dt { color: var(--ink-3); }
.meta-list dd { margin: 0; }

/* ── 空状态 / 错误 / 404 ────────────────────────────────────────── */

.empty-panel {
  background: var(--surface);
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin: 14px 0;
}
.empty-title { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.empty-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }

.error-panel {
  max-width: 760px;
  margin: 36px auto;
  padding: 24px 26px;
  background: #fff7f7;
  border: 1px solid #eec9c9;
  border-radius: var(--radius);
}
.error-panel h1 { font-size: 21px; }
.error-msg { font-size: 15px; color: #7a2020; }
.error-detail {
  white-space: pre-wrap;
  font-size: 12.5px;
  background: #fff;
  border: 1px solid #eec9c9;
  border-radius: 8px;
  padding: 10px 12px;
  overflow-x: auto;
}
.error-help { margin: 10px 0; padding-left: 20px; font-size: 14px; color: var(--ink-2); }

/* ── 页脚 ───────────────────────────────────────────────────────── */

.site-footer { border-top: 1px solid var(--line); background: var(--surface); }
.footer-inner { max-width: 1180px; margin: 0 auto; padding: 20px; font-size: 13px; color: var(--ink-2); }
.footer-inner p { margin: 0 0 4px; }

.noscript {
  margin: 24px auto;
  max-width: 760px;
  padding: 16px 20px;
  background: var(--warn-soft);
  border: 1px solid #e8cf9b;
  border-radius: var(--radius);
  color: var(--warn);
}

/* ── 响应式 ───────────────────────────────────────────────────────
 * 断点：900px（页头换行）/ 720px（手机竖版）/ 480px / 380px（窄小屏）
 * 手机端目标：单列卡片、≥40px 触控高度、无横向溢出、iOS 输入不缩放。 */

@media (max-width: 900px) {
  .search { flex: 1 1 100%; order: 3; }
  .site-nav { order: 2; }
  .brand { flex: 1 1 auto; }
}

@media (max-width: 720px) {
  body { font-size: 15.5px; -webkit-tap-highlight-color: transparent; }
  html { scroll-padding-top: 118px; }

  /* 页头：两行网格（品牌 + 全宽搜索 / 全宽可横滑导航），高度可控且可触达 */
  .header-inner {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    grid-template-areas:
      "brand search"
      "nav nav";
    align-items: center;
    gap: 8px 10px;
    padding: calc(8px + env(safe-area-inset-top, 0px)) 10px 8px;
  }
  .brand { grid-area: brand; min-width: 0; }
  .brand-mark { width: 30px; height: 30px; font-size: 15px; border-radius: 8px; }
  .brand-name { font-size: 14px; }
  .brand-sub { display: none; }

  .site-nav {
    grid-area: nav;
    flex-wrap: nowrap;
    overflow-x: auto;
    gap: 2px;
    min-width: 0;
    padding: 2px 0;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x proximity;
  }
  .site-nav::-webkit-scrollbar { display: none; }
  .site-nav a {
    display: inline-flex;
    align-items: center;
    min-height: 36px;
    padding: 0 10px;
    font-size: 13.5px;
    white-space: nowrap;
    border: 1px solid transparent;
    border-radius: 999px;
    scroll-snap-align: start;
  }
  .site-nav a[aria-current="page"] {
    background: var(--accent-soft);
    border-color: #cfe6e1;
    color: var(--accent-2);
  }

  .search { grid-area: search; flex: initial; min-width: 0; }
  .search-input { font-size: 16px; padding: 10px 10px; }
  .btn-search { padding: 9px 12px; }

  main { padding: 16px 12px calc(44px + env(safe-area-inset-bottom, 0px)); }
  .hero { padding: 20px 16px; border-radius: 14px; }
  .hero-title { font-size: 1.5rem; }
  .hero-lede { font-size: 14.5px; margin-bottom: 14px; }
  .hero-actions, .home-links { gap: 8px; }
  .hero-actions .btn, .home-links .btn { flex: 1 1 44%; min-height: 42px; }

  .stat-bar { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat { padding: 12px 14px; border-left: 0; border-top: 1px solid var(--line); }
  .stat:first-child { border-left: 0; }
  .stat:nth-child(-n+2) { border-top: 0; }
  .stat:nth-child(even) { border-left: 1px solid var(--line); }
  .stat-num { font-size: 21px; }

  .two-col { grid-template-columns: 1fr; }
  .card-grid, .scenario-grid, .scene-grid { grid-template-columns: 1fr; }
  .card { padding: 14px; border-radius: 10px; }
  .meta-list { grid-template-columns: 1fr; gap: 2px; }
  .meta-list dd { margin-bottom: 8px; }

  .section { margin-top: 22px; }
  .section-title { font-size: 17px; }
  .section-head { gap: 6px 12px; }

  .page-head h1, .entry-head h1 { font-size: 1.3rem; }
  .page-sub, .hero-lede { font-size: 14px; }
  .result-item { padding: 14px 6px; }
  .result-title { font-size: 16px; }

  /* 筛选与表单：整行、≥40px 触控 */
  .filter-bar { flex-direction: column; align-items: stretch; gap: 8px; padding: 10px; }
  .filter { width: 100%; }
  .select, .input { min-height: 40px; font-size: 15px; }
  .btn { min-height: 40px; padding: 9px 14px; }
  .chip { min-height: 32px; }

  /* 表格：横向滚动而不压缩列宽 */
  .table-wrap {
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--surface);
    -webkit-overflow-scrolling: touch;
  }
  .matrix-table, .var-table { font-size: 13px; min-width: 420px; }
  .matrix-table th, .matrix-table td,
  .var-table th, .var-table td { padding: 8px 9px; }
  .domain-table { font-size: 13px; }
  .domain-table th, .domain-table td { padding: 8px 6px; }

  .formula, .case, .model { padding: 14px 12px; }
  .formula { scroll-margin-top: 128px; }
  .formula-name, .formula-card-name { font-size: 15.5px; }
  .expression { font-size: 15px; padding: 12px; }
  .definition { font-size: 15.5px; padding: 14px; }
  .step { padding: 12px 12px 12px 44px; }
  .step::before { left: 10px; top: 13px; }
  .model-list, .plain-list, .case-actions { padding-left: 18px; }

  .pick-panel { padding: 14px 12px; }
  .wizard-group { padding: 12px; }
  .scene-panel { padding: 14px 12px; }
  .pick-symptom { font-size: 14.5px; padding: 10px 12px; }
  .symptom { display: flex; align-items: center; min-height: 44px; padding: 10px 12px; }
  .rec-head { gap: 8px; }
  .rec-name { font-size: 15px; }
  .rec-why { padding-left: 18px; }

  /* 触控目标：内联链接补足纵向点击区（视觉几乎不变，命中区更大） */
  .domain-links { gap: 6px 16px; }
  .domain-links a, .link-more, .link { display: inline-block; padding: 5px 0; }
  .entry-row-title a, .formula-card-name a, .wizard-group-title a,
  .pick-entry-name, .scene-title a, .rec-name { display: inline-block; padding: 5px 0; }
  .badge-link { padding: 5px 9px; }
  .crumb a { display: inline-block; padding: 3px 0; }
  /* 卡片标题 / 关联方法 / 表格内链接补足 24–28px 命中区 */
  .domain-name a, .related-head a, .formula-source a, .domain-table a { display: inline-block; padding: 4px 0; }

  /* 操作按钮：整行更好点 */
  .entry-footer .btn, .rec-actions .btn, .pick-actions .btn,
  .empty-actions .btn, .scene-panel .btn { flex: 1 1 100%; }
  .pager { flex-direction: column; align-items: stretch; }
  .pager .btn { width: 100%; }
  .crumb { font-size: 12.5px; margin-bottom: 8px; }
}

@media (max-width: 480px) {
  body { font-size: 15px; }
  /* 手机宽度让位给导航：只留品牌标，名称仍通过 aria-label 可访问 */
  .brand-sub, .brand-name { display: none; }
  .site-nav { gap: 2px; }
  .site-nav a { font-size: 13px; padding: 0 9px; }
  .card-grid, .scenario-grid, .scene-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 1.4rem; }
  .btn { padding: 8px 13px; }
  .btn-sm { padding: 6px 10px; }
  .header-inner { gap: 8px 8px; }
  .entry-head h1 { font-size: 1.25rem; }
  .expression { font-size: 14.5px; }
  .stat { padding: 10px 12px; }
  .stat-num { font-size: 20px; }
  .matrix-table, .var-table { min-width: 380px; }
}

@media (max-width: 380px) {
  .brand-name { font-size: 13px; }
  .brand-mark { width: 28px; height: 28px; font-size: 14px; }
  .site-nav a { font-size: 12.5px; padding: 0 8px; }
  .hero-title { font-size: 1.3rem; }
  .hero-actions .btn, .home-links .btn { flex: 1 1 100%; }
  .matrix-table, .var-table { font-size: 12.5px; min-width: 340px; }
}

/* ── 打印 ───────────────────────────────────────────────────────── */

@media print {
  @page { margin: 14mm; }

  body { background: #fff; color: #000; font-size: 11pt; }
  main { max-width: none; padding: 0; }
  .site-header, .site-footer, .skip-link, .search, .site-nav,
  .filter-bar, .more-row, .pager, .entry-footer, .hero-actions,
  .home-links, .quick-links, .btn, .crumb, .noscript { display: none !important; }

  a { color: #000; text-decoration: none; }
  .card, .section, .formula, .step, .case, .ref, .panel, .wizard-group,
  .formula-card, .pick-card, .entry-row, .definition, .rec-item { break-inside: avoid; }
  .formula, .formula-card, .expression { break-inside: avoid; page-break-inside: avoid; }
  h1, h2, h3, h4 { break-after: avoid; }

  .scene-grid, .copy-btn, .rec-actions { display: none !important; }
  .scene-panel { border: 1px solid #000; box-shadow: none; }
  .rec-rank { background: #fff; color: #000; border: 1px solid #000; }
  .domain-table th, .domain-table td { border-bottom: 1px solid #000; }

  .hero { background: none; border: 1px solid #000; }
  .badge, .chip { border: 1px solid #000; background: #fff; color: #000; }
  .expression { background: #fff; border: 1px solid #000; border-left: 3px solid #000; color: #000; }
  .table-wrap { overflow: visible; }
  .matrix-table th, .matrix-table td, .var-table th, .var-table td { border-bottom: 1px solid #000; }
  mark { background: transparent; text-decoration: underline; }
  .stat-bar { border: 1px solid #000; }
  .stat { border-color: #000; }
  .stat-num { color: #000; }
  .step::before, .flow-index { background: #fff; color: #000; border: 1px solid #000; }
  .pick-panel { background: #fff; border: 1px solid #000; }
  .case-result { background: #fff; border-left: 1px solid #000; }
}