:root {
  --ink:#1b1b1b; --muted:#5a5a5a; --line:#c9c9c9; --accent:#23395d;
  --soft:#f4f6f8; --bg:#f7f8fa; --card:#fff;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; color: var(--ink); background: var(--bg);
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px; line-height: 1.55;
}
a { color: #0b4a8b; text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 920px; margin: 0 auto; padding: 1rem 1.1rem 3rem; }
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: rgba(247,248,250,.92); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 920px; margin: 0 auto; padding: .65rem 1.1rem;
  display: flex; gap: .75rem; align-items: center; flex-wrap: wrap;
}
.brand { font-weight: 700; color: var(--accent); letter-spacing: -.01em; }
.brand span { color: var(--muted); font-weight: 500; font-size: .85em; }
.search-wrap {
  position: relative;
  flex: 1;
  min-width: 160px;
}
.search {
  width: 100%; padding: .55rem .75rem;
  border: 1px solid var(--line); border-radius: 8px; background: #fff;
  font: inherit;
}
.nav-links { display: flex; gap: .6rem; flex-wrap: wrap; font-size: .9rem; }
.hero {
  padding: 2.2rem 0 1.4rem;
  background:
    radial-gradient(1200px 400px at 10% -20%, #d9e4f2 0%, transparent 55%),
    linear-gradient(180deg, #eef2f6, transparent 70%);
}
.hero h1 {
  margin: 0 0 .4rem; color: var(--accent);
  font-size: clamp(1.55rem, 4vw, 2.2rem); line-height: 1.15;
}
.hero p { margin: 0; color: var(--muted); max-width: 42rem; }
.card-grid {
  display: grid; gap: .8rem;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  margin: 1.2rem 0 2rem;
}
.card {
  display: block; background: var(--card); border: 1px solid var(--line);
  border-radius: 12px; padding: 1rem 1.05rem; color: inherit;
  transition: border-color .15s, transform .15s;
}
.card:hover { border-color: #8aa0bf; text-decoration: none; transform: translateY(-1px); }
.card strong { display: block; color: var(--accent); margin-bottom: .25rem; }
.card small { color: var(--muted); }
.meta { color: var(--muted); font-size: .9rem; margin: .8rem 0 1.2rem; }
.content h1, .content h2, .content h3, .content h4 {
  color: var(--accent); line-height: 1.2; scroll-margin-top: 4.5rem;
}
.content h1 {
  font-size: 1.65rem; border-bottom: 2px solid var(--accent);
  padding-bottom: .25rem; margin-top: 1.4rem;
}
.content h2 { font-size: 1.28rem; border-bottom: 1px solid var(--line); padding-bottom: .15rem; }
.content h3 { font-size: 1.08rem; }
.content table {
  width: 100%; border-collapse: collapse; margin: .7rem 0 1rem;
  font-size: .82rem; table-layout: fixed; background: #fff;
}
.content th, .content td {
  border: 1px solid var(--line); padding: 4px 6px; vertical-align: top;
  overflow-wrap: anywhere; word-break: break-word;
}
.content th { background: #e9edf3; }
.content pre, .content code {
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: .88em; overflow-wrap: anywhere;
}
.content pre {
  background: #f1f3f5; border-left: 3px solid #777; padding: .7rem;
  white-space: pre-wrap; overflow-x: auto;
}
.content blockquote {
  border-left: 4px solid #8b96a8; margin: 1rem 0; padding: .3rem 1rem;
  color: #383838; background: #f7f8fa;
}
.local-toc {
  background: #fff; border: 1px solid var(--line); border-radius: 12px;
  padding: 1rem 1.1rem; margin: 1rem 0 1.5rem;
}
.local-toc summary { cursor: pointer; font-weight: 600; color: var(--accent); }
.local-toc ul { margin: .6rem 0 0; padding-left: 1.1rem; }
.pager {
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  margin: 2rem 0 1rem; padding-top: 1rem; border-top: 1px solid var(--line);
}
.pager a {
  background: #fff; border: 1px solid var(--line); border-radius: 10px;
  padding: .7rem .9rem; max-width: 46%;
}
.pager a:hover { border-color: #8aa0bf; text-decoration: none; }
.results {
  display: none;
  position: absolute;
  left: 0; right: 0; top: calc(100% + .35rem);
  z-index: 40; margin: 0; padding: .65rem .75rem;
  max-height: min(70vh, 420px); overflow: auto;
  background: #fff; border: 1px solid var(--line); border-radius: 10px;
  box-shadow: 0 12px 28px rgba(27, 27, 27, .14);
}
.results.open { display: block; }
.results h2 { margin: 0 0 .45rem; font-size: 1rem; color: var(--accent); }
.results > p { margin: 0; color: var(--muted); font-size: .92rem; }
.hit {
  display: block; padding: .65rem .75rem; margin: .35rem 0; background: var(--soft);
  border: 1px solid var(--line); border-radius: 8px; color: inherit;
}
.hit:hover { border-color: #8aa0bf; text-decoration: none; }
.hit small { color: var(--muted); display: block; margin-top: .2rem; }
.footnote { color: var(--muted); font-size: .85rem; margin-top: 2rem; }
.part-list { columns: 2; gap: 1.2rem; margin: 1rem 0 2rem; padding-left: 1.1rem; }
@media (max-width: 700px) {
  .pager a { max-width: 100%; width: 100%; }
  .part-list { columns: 1; }
}