:root {
  --ink: #161410;
  --ink-soft: #3d3830;
  --navy: #1c2433;
  --navy-2: #263044;
  --paper: #f3eee4;
  --paper-2: #eae3d4;
  --card: #fffdf8;
  --gold: #b07a28;
  --gold-2: #d7b56a;
  --terracotta: #c45c3e;
  --sage: #2f6a55;
  --line: #ddd2be;
  --line-strong: #cbbda3;
  --shadow: 0 18px 40px rgba(28, 24, 16, 0.08);
  --radius: 18px;
  --max: 1180px;
  --serif: "Noto Serif SC", "Songti SC", serif;
  --sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 480px at 10% -10%, rgba(176, 122, 40, 0.12), transparent 55%),
    radial-gradient(900px 400px at 110% 8%, rgba(47, 106, 85, 0.08), transparent 50%),
    var(--paper);
  font-family: var(--sans);
  line-height: 1.7;
}
img { max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input { font-family: inherit; }

.skip {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--ink);
  color: #fff;
  padding: 8px 12px;
  z-index: 20;
}
.skip:focus { left: 8px; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(243, 238, 228, 0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner, .wrap {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
}
.topbar-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 72px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--serif);
  font-weight: 700;
  letter-spacing: 0.04em;
}
.mark {
  width: 36px;
  height: 36px;
  border: 1.5px solid var(--ink);
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: linear-gradient(180deg, #fff8e8, #f0d9a4);
  box-shadow: inset 0 -6px 0 rgba(176, 122, 40, 0.18);
}
.nav {
  display: flex;
  gap: 6px;
  margin-left: auto;
  align-items: center;
  flex-wrap: wrap;
}
.nav a, .nav-toggle {
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--ink-soft);
  font-size: 14px;
}
.nav a:hover, .nav a.active { background: #fff; color: var(--ink); }
.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: #fff;
  cursor: pointer;
}

.search-box {
  position: relative;
  min-width: 220px;
}
.search-box input {
  width: 100%;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 9px 14px 9px 36px;
  outline: none;
}
.search-box svg {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  opacity: 0.5;
}
.search-panel {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  width: min(420px, 80vw);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow);
  max-height: 360px;
  overflow: auto;
  padding: 8px;
}
.search-panel.open { display: block; }
.search-item {
  display: block;
  padding: 10px 12px;
  border-radius: 10px;
}
.search-item:hover { background: var(--paper-2); }
.search-item small { color: var(--ink-soft); display: block; }

.hero {
  padding: 56px 0 28px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}
.kicker {
  color: var(--gold);
  letter-spacing: 0.18em;
  font-size: 12px;
  font-weight: 700;
}
h1, h2, h3, .serif { font-family: var(--serif); }
h1 {
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1.15;
  margin: 10px 0 16px;
}
.lede { font-size: 18px; color: var(--ink-soft); max-width: 46ch; }
.hero-actions { display: flex; gap: 12px; margin-top: 24px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  padding: 12px 18px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: #fff;
  font-weight: 600;
}
.btn.ghost { background: transparent; color: var(--ink); }
.stamp {
  border: 1px dashed var(--line-strong);
  background:
    repeating-linear-gradient(-45deg, transparent, transparent 8px, rgba(176,122,40,.05) 8px, rgba(176,122,40,.05) 9px),
    var(--card);
  border-radius: 24px;
  padding: 28px;
  box-shadow: var(--shadow);
}
.stamp dl { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 0; }
.stamp dt { font-size: 12px; color: var(--ink-soft); }
.stamp dd { margin: 0; font-family: var(--serif); font-size: 28px; }

.section { padding: 28px 0 8px; }
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 16px;
  margin-bottom: 18px;
}
.section-head h2 { margin: 0; font-size: 30px; }
.section-head p { margin: 0; color: var(--ink-soft); }

.cats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.cat {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  min-height: 160px;
  display: flex;
  flex-direction: column;
  transition: transform .18s ease, box-shadow .18s ease;
}
.cat:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.cat .num {
  font-family: var(--serif);
  color: var(--gold);
  font-size: 13px;
  letter-spacing: 0.12em;
}
.cat h3 { margin: 8px 0 6px; font-size: 22px; }
.cat p { margin: 0 0 auto; color: var(--ink-soft); font-size: 14px; }
.cat .meta { margin-top: 14px; font-size: 13px; color: var(--sage); }

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  min-height: 220px;
}
.card:hover { border-color: var(--gold-2); }
.pill {
  display: inline-flex;
  width: fit-content;
  padding: 3px 10px;
  border-radius: 999px;
  background: #f4e6c8;
  color: #7a5414;
  font-size: 12px;
  font-weight: 600;
}
.pill.green { background: #dceee4; color: #21543f; }
.pill.red { background: #f8ddd4; color: #8a3724; }
.card h3 { margin: 12px 0 8px; font-size: 20px; }
.card p { margin: 0 0 auto; color: var(--ink-soft); }
.card .foot { display: flex; justify-content: space-between; margin-top: 16px; font-size: 13px; color: var(--ink-soft); }

.path-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.path-step {
  background: var(--navy);
  color: #f6efe2;
  border-radius: 16px;
  padding: 18px;
  min-height: 170px;
}
.path-step b { color: var(--gold-2); display: block; margin-bottom: 8px; font-size: 12px; letter-spacing: 0.12em; }
.path-step h3 { margin: 0 0 8px; font-size: 18px; }
.path-step p { margin: 0; color: #c9c1b2; font-size: 14px; }

.article-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 36px;
  padding: 32px 0 64px;
}
.toc {
  position: sticky;
  top: 92px;
  align-self: start;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
}
.toc h4 { margin: 0 0 8px; }
.toc a { display: block; color: var(--ink-soft); font-size: 13px; padding: 5px 0; }
.toc a:hover { color: var(--ink); }
.crumb { color: var(--ink-soft); font-size: 13px; margin-bottom: 10px; }
.crumb a { text-decoration: underline; text-underline-offset: 3px; }
.article-body { background: var(--card); border: 1px solid var(--line); border-radius: 24px; padding: 36px; }
.article-body h1 { font-size: clamp(28px, 4vw, 42px); }
.article-body h2 { font-size: 24px; margin-top: 32px; }
.article-body p { font-size: 17px; }
.article-body ul, .article-body ol { padding-left: 1.2em; }
.article-body blockquote {
  margin: 20px 0;
  padding: 12px 16px;
  border-left: 3px solid var(--gold);
  background: #f8f1e0;
  color: var(--ink-soft);
}
.takeaways {
  display: grid;
  gap: 8px;
  background: #f6efe0;
  border: 1px dashed var(--line-strong);
  border-radius: 16px;
  padding: 16px;
  margin: 16px 0 28px;
}
.takeaways li { margin-left: 1em; }
.related { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 28px; }

.page-hero { padding: 40px 0 10px; }
.filter-row { display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0 20px; }
.filter-row button {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 7px 12px;
  cursor: pointer;
}
.filter-row button.active { background: var(--ink); color: #fff; border-color: var(--ink); }

.glossary dt { font-weight: 700; margin-top: 16px; font-family: var(--serif); }
.glossary dd { margin: 4px 0 0; color: var(--ink-soft); }

.site-footer {
  margin-top: 48px;
  background: var(--navy);
  color: #efe7d6;
  padding: 36px 0 24px;
}
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 24px; }
.site-footer a { color: #efe7d6; }
.site-footer p, .copy { color: #b9b1a2; }
.copy { margin-top: 24px; font-size: 13px; border-top: 1px solid #364155; padding-top: 16px; }

.empty { padding: 30px; color: var(--ink-soft); }

@media (max-width: 900px) {
  .hero, .article-layout, .cats, .cards, .path-grid, .foot-grid, .related {
    grid-template-columns: 1fr;
  }
  .section-head {
    flex-direction: column;
    align-items: flex-start;
  }
  .nav { display: none; }
  .nav.open {
    display: flex;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 12px 16px 16px;
    flex-direction: column;
    align-items: stretch;
  }
  .nav-toggle { display: inline-flex; margin-left: auto; }
  .search-box { width: 100%; }
  .article-body { padding: 22px; }
  .toc { position: static; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .cat { transition: none; }
}