:root {
  --bg: #f7f8f5;
  --paper: #ffffff;
  --ink: #17211e;
  --muted: #6b746f;
  --line: #dbe1dc;
  --teal: #087c75;
  --rust: #bd5a32;
  --gold: #d7aa31;
  --code: #eef3ef;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}

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

a:hover {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  z-index: 10;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 60px;
  padding: 0 24px;
  border-bottom: 1px solid var(--line);
  background: rgba(247, 248, 245, 0.92);
  backdrop-filter: blur(18px);
}

.brand {
  color: var(--ink);
  font-size: 18px;
  font-weight: 850;
}

.search-link {
  color: var(--ink);
  font-size: 14px;
  font-weight: 750;
}

.page-shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 32px;
  width: min(1320px, calc(100vw - 40px));
  margin: 0 auto;
  padding: 28px 0 56px;
}

.sidebar {
  position: sticky;
  top: 88px;
  align-self: start;
  max-height: calc(100svh - 104px);
  overflow: auto;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.sidebar-title {
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 850;
}

.nav-link {
  display: grid;
  gap: 2px;
  padding: 9px 10px;
  border-radius: 7px;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.35;
}

.nav-link span {
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
}

.nav-link.active,
.nav-link:hover {
  background: rgba(8, 124, 117, 0.08);
  text-decoration: none;
}

.content {
  min-width: 0;
}

.article {
  max-width: 860px;
  padding: 34px 40px 56px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.source-line {
  margin-bottom: 22px;
  color: var(--muted);
  font-size: 12px;
}

h1,
h2,
h3,
h4 {
  color: var(--ink);
  line-height: 1.22;
  letter-spacing: 0;
}

h1 {
  margin: 0 0 24px;
  font-size: clamp(32px, 5vw, 54px);
}

h2 {
  margin: 42px 0 14px;
  padding-top: 4px;
  border-top: 1px solid var(--line);
  font-size: 26px;
}

h3 {
  margin: 30px 0 10px;
  font-size: 20px;
}

p,
li {
  font-size: 17px;
}

ul,
ol {
  padding-left: 1.35rem;
}

li + li {
  margin-top: 6px;
}

code {
  padding: 2px 5px;
  border-radius: 5px;
  background: var(--code);
  color: #26332f;
  font-family: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  font-size: 0.9em;
}

pre {
  overflow: auto;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #101816;
  color: #edf6f2;
  line-height: 1.55;
}

pre code {
  padding: 0;
  background: transparent;
  color: inherit;
}

.math-block {
  overflow-x: auto;
  padding: 12px 0;
}

blockquote {
  margin: 20px 0;
  padding: 12px 18px;
  border-left: 4px solid var(--teal);
  background: rgba(8, 124, 117, 0.07);
}

.table-wrap {
  overflow-x: auto;
  margin: 20px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

th,
td {
  padding: 10px 12px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: #f0f4f1;
}

.notice {
  padding: 12px 14px;
  border: 1px solid rgba(215, 170, 49, 0.45);
  border-radius: 8px;
  background: rgba(215, 170, 49, 0.12);
}

.quick-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 36px;
}

.quick-grid a {
  display: grid;
  gap: 4px;
  min-height: 108px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: #fbfcfa;
}

.quick-grid a:hover {
  border-color: rgba(8, 124, 117, 0.45);
  text-decoration: none;
}

.quick-grid strong {
  font-size: 17px;
}

.quick-grid span {
  color: var(--muted);
  font-size: 14px;
}

.search-box input {
  width: 100%;
  min-height: 48px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
}

.search-results {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.result-card {
  display: grid;
  gap: 4px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfa;
}

.result-card span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

@media (max-width: 880px) {
  .site-header {
    min-height: 56px;
    padding: 0 16px;
  }

  .page-shell {
    display: block;
    width: calc(100vw - 24px);
    padding-top: 14px;
  }

  .sidebar {
    position: static;
    display: block;
    max-height: none;
    margin-bottom: 14px;
    padding: 12px;
  }

  .sidebar nav {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .nav-link {
    flex: 0 0 190px;
    min-height: 58px;
    border: 1px solid var(--line);
  }

  .article {
    padding: 24px 18px 42px;
  }

  p,
  li {
    font-size: 16px;
  }

  .quick-grid {
    grid-template-columns: 1fr;
  }
}