:root {
  --accent: #2563eb;
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --bg-sidebar: #fbfcfd;
  --text: #1f2328;
  --text-soft: #59636e;
  --border: #d8dee4;
  --code-bg: #f6f8fa;
  --header-h: 56px;
  --sidebar-w: 272px;
  --toc-w: 220px;
  --shiki-bg: var(--shiki-light-bg);
  font-synthesis: none;
}

[data-theme='dark'] {
  --bg: #0d1117;
  --bg-soft: #161b22;
  --bg-sidebar: #0f141a;
  --text: #e6edf3;
  --text-soft: #9198a1;
  --border: #2a313c;
  --code-bg: #161b22;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 18px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 9px; font-weight: 650; color: var(--text); }
.brand:hover { text-decoration: none; }
.logo { height: 26px; width: auto; }
.header-spacer { flex: 1; }
.header-link { color: var(--text-soft); font-size: 14px; }
.vis-badge {
  font-size: 11px; font-weight: 600; letter-spacing: .02em; text-transform: uppercase;
  padding: 2px 8px; border-radius: 999px; border: 1px solid var(--border);
}
.vis-private { color: #b45309; border-color: color-mix(in srgb, #b45309 40%, var(--border)); }
.vis-public { color: #15803d; border-color: color-mix(in srgb, #15803d 40%, var(--border)); }
[data-theme='dark'] .vis-private { color: #f0b429; }
[data-theme='dark'] .vis-public { color: #4ade80; }

.theme-toggle, .menu-toggle {
  background: transparent; border: 1px solid var(--border); color: var(--text);
  border-radius: 8px; height: 34px; min-width: 34px; cursor: pointer; font-size: 15px;
}
.theme-toggle:hover, .menu-toggle:hover { background: var(--bg-soft); }
.menu-toggle { display: none; }
.theme-icon-dark { display: none; }
[data-theme='dark'] .theme-icon-light { display: none; }
[data-theme='dark'] .theme-icon-dark { display: inline; }

/* ---------- Search ---------- */
.search { position: relative; width: min(360px, 38vw); }
#search-input {
  width: 100%; height: 34px; padding: 0 12px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--bg-soft); color: var(--text);
  font-size: 14px;
}
#search-input:focus { outline: 2px solid color-mix(in srgb, var(--accent) 45%, transparent); border-color: var(--accent); }
.search-results {
  position: absolute; top: 42px; left: 0; right: 0; max-height: 60vh; overflow-y: auto;
  background: var(--bg); border: 1px solid var(--border); border-radius: 10px;
  box-shadow: 0 12px 40px rgba(0,0,0,.18); padding: 6px;
}
.search-results a { display: block; padding: 8px 10px; border-radius: 7px; color: var(--text); }
.search-results a:hover, .search-results a.active { background: var(--bg-soft); text-decoration: none; }
.search-results .r-title { font-weight: 600; font-size: 14px; }
.search-results .r-snippet { font-size: 12.5px; color: var(--text-soft); margin-top: 2px; }
.search-results .r-empty { padding: 10px; color: var(--text-soft); font-size: 13px; }
.search-results mark { background: color-mix(in srgb, var(--accent) 30%, transparent); color: inherit; border-radius: 3px; }

/* ---------- Layout ---------- */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr) var(--toc-w);
  width: 100%;
}
.sidebar {
  position: sticky; top: var(--header-h); align-self: start;
  height: calc(100vh - var(--header-h)); overflow-y: auto;
  padding: 22px 14px 60px; border-right: 1px solid var(--border);
  background: var(--bg-sidebar);
}
.content { min-width: 0; padding: 36px 48px 80px; }
.toc {
  position: sticky; top: var(--header-h); align-self: start;
  height: calc(100vh - var(--header-h)); overflow-y: auto;
  padding: 36px 18px; font-size: 13.5px;
}

/* ---------- Nav ---------- */
.nav-list { list-style: none; margin: 0; padding: 0; }
.nav-list .nav-list { margin-left: 10px; padding-left: 8px; border-left: 1px solid var(--border); }
.nav-link {
  display: block; padding: 5px 10px; border-radius: 7px; color: var(--text-soft);
  font-size: 14px; line-height: 1.4;
}
.nav-link:hover { background: var(--bg-soft); color: var(--text); text-decoration: none; }
.nav-link.active { color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); font-weight: 600; }
.nav-section { margin-top: 14px; }
.nav-section-label, .nav-section-link {
  display: block; padding: 4px 10px; font-size: 12px; font-weight: 700;
  text-transform: uppercase; letter-spacing: .04em; color: var(--text);
}
.nav-section-link:hover { text-decoration: none; }

/* ---------- TOC ---------- */
.toc-title { font-weight: 700; font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--text-soft); margin-bottom: 10px; }
.toc ul { list-style: none; margin: 0; padding: 0; }
.toc li { margin: 4px 0; }
.toc a { color: var(--text-soft); }
.toc a:hover { color: var(--accent); text-decoration: none; }
.toc-l3 { padding-left: 12px; font-size: 13px; }

/* ---------- Prose ---------- */
.prose { max-width: 760px; }
.prose h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 .6em; letter-spacing: -.02em; }
.prose h2 { font-size: 1.45rem; margin: 2em 0 .6em; padding-bottom: .3em; border-bottom: 1px solid var(--border); letter-spacing: -.01em; }
.prose h3 { font-size: 1.18rem; margin: 1.6em 0 .5em; }
.prose h4 { font-size: 1rem; margin: 1.4em 0 .4em; }
.prose p, .prose li { color: var(--text); }
.prose a { font-weight: 500; }
.prose code {
  font-family: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, monospace;
  font-size: .88em; background: var(--code-bg); padding: .15em .4em; border-radius: 5px;
  border: 1px solid var(--border);
}
.prose pre {
  background: var(--shiki-light-bg, var(--code-bg)); border: 1px solid var(--border);
  border-radius: 10px; padding: 16px 18px; overflow-x: auto; line-height: 1.55; font-size: 13.5px;
}
.prose pre code { background: none; border: none; padding: 0; font-size: inherit; }
.prose blockquote {
  margin: 1.2em 0; padding: .4em 1.1em; border-left: 3px solid var(--accent);
  background: var(--bg-soft); border-radius: 0 8px 8px 0; color: var(--text-soft);
}
.prose table { border-collapse: collapse; width: 100%; margin: 1.2em 0; font-size: 14.5px; }
.prose th, .prose td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.prose th { background: var(--bg-soft); }
.prose img { max-width: 100%; border-radius: 8px; }
.prose hr { border: none; border-top: 1px solid var(--border); margin: 2.5em 0; }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li { margin: .3em 0; }
.header-anchor { color: var(--text-soft); opacity: 0; margin-left: .3em; font-weight: 400; text-decoration: none; }
.prose h2:hover .header-anchor, .prose h3:hover .header-anchor { opacity: 1; }

/* ---------- Mermaid ---------- */
.mermaid-wrap {
  margin: 1.4em 0;
  padding: 18px 16px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow-x: auto;
  text-align: center;
}
.prose .mermaid-wrap pre.mermaid {
  background: transparent;
  border: none;
  padding: 0;
  margin: 0;
  overflow: visible;
  font-size: inherit;
  line-height: normal;
  text-align: center;
}
.mermaid-wrap .mermaid svg {
  max-width: 100%;
  height: auto;
}

/* Shiki dual-theme color swap */
[data-theme='dark'] .shiki,
[data-theme='dark'] .shiki span {
  color: var(--shiki-dark) !important;
  background-color: var(--shiki-dark-bg) !important;
}

/* ---------- Pager ---------- */
.pager { display: flex; gap: 14px; margin-top: 56px; }
.pager-link {
  flex: 1; display: flex; flex-direction: column; gap: 4px; padding: 14px 18px;
  border: 1px solid var(--border); border-radius: 10px; color: var(--text);
}
.pager-link:hover { border-color: var(--accent); text-decoration: none; }
.pager-next { text-align: right; }
.pager-dir { font-size: 12px; color: var(--text-soft); }
.pager-title { font-weight: 600; }

.page-footer { margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--border); color: var(--text-soft); font-size: 13.5px; }

.sidebar-backdrop { display: none; }

/* ---------- Responsive ---------- */
@media (max-width: 1100px) {
  .layout { grid-template-columns: var(--sidebar-w) minmax(0, 1fr); }
  .toc { display: none; }
}
@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .menu-toggle { display: inline-block; }
  .content { padding: 28px 22px 70px; }
  .search { width: auto; flex: 1; }
  .vis-badge, .header-link { display: none; }
  .sidebar {
    position: fixed; top: var(--header-h); left: 0; bottom: 0; width: 84vw; max-width: 320px;
    z-index: 50; transform: translateX(-100%); transition: transform .2s ease;
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar.open ~ .sidebar-backdrop { display: block; position: fixed; inset: var(--header-h) 0 0 0; background: rgba(0,0,0,.4); z-index: 45; }
}