:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --text: #1f2328;
  --muted: #59636e;
  --border: #d1d9e0;
  --link: #0969da;
  --code-bg: #eff1f3;
  --header-bg: #1f2937;
  --header-text: #f3f4f6;
  --note: #0969da;
  --tip: #1a7f37;
  --important: #8250df;
  --warning: #9a6700;
  --caution: #cf222e;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --bg-soft: #151b23;
    --text: #e6edf3;
    --muted: #9198a1;
    --border: #3d444d;
    --link: #4493f8;
    --code-bg: #262c36;
    --header-bg: #010409;
    --header-text: #e6edf3;
    --note: #4493f8;
    --tip: #3fb950;
    --important: #ab7df8;
    --warning: #d29922;
    --caution: #f85149;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  overflow-wrap: anywhere;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 4px 16px;
  padding: 10px 16px;
  background: var(--header-bg);
  color: var(--header-text);
}
.site-header a { color: var(--header-text); }
.brand { font-weight: 700; font-size: 1.05rem; }
.header-links { display: flex; gap: 16px; font-size: 0.92rem; }
.toc-jump { display: none; }

.layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  grid-template-areas: "side main";
  gap: 32px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 16px 40px;
}
.content { grid-area: main; min-width: 0; max-width: 860px; }
.sidebar {
  grid-area: side;
  align-self: start;
  position: sticky;
  top: 16px;
  max-height: calc(100vh - 32px);
  overflow-y: auto;
  font-size: 0.9rem;
  line-height: 1.6;
}
.sidebar-title { font-size: 1rem; font-weight: 700; margin: 0 0 8px; }
.sidebar h2 {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 16px 0 4px;
  border: 0;
  padding: 0;
}
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li { margin: 0; }
.sidebar a { display: block; padding: 2px 8px; border-radius: 6px; color: var(--text); }
.sidebar a:hover { background: var(--bg-soft); text-decoration: none; }
.sidebar a[aria-current="page"] { background: var(--bg-soft); color: var(--link); font-weight: 600; }

@media (max-width: 860px) {
  .layout { grid-template-columns: minmax(0, 1fr); grid-template-areas: "main" "side"; }
  .sidebar {
    position: static;
    max-height: none;
    border-top: 1px solid var(--border);
    padding-top: 16px;
  }
  .toc-jump { display: inline; }
}

.content h1, .content h2 { border-bottom: 1px solid var(--border); padding-bottom: 0.3em; }
.content h1 { font-size: 1.8rem; line-height: 1.35; margin: 0 0 16px; }
.content h2 { font-size: 1.4rem; margin: 32px 0 12px; }
.content h3 { font-size: 1.15rem; margin: 24px 0 8px; }
.content h4 { font-size: 1rem; margin: 20px 0 8px; }
.content :target { scroll-margin-top: 16px; }
.content img { max-width: 100%; height: auto; image-rendering: pixelated; }
.content ul, .content ol { padding-left: 1.6em; }
.content hr { border: 0; border-top: 1px solid var(--border); margin: 24px 0; }

code {
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.15em 0.35em;
  border-radius: 4px;
}
pre {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 16px;
  overflow-x: auto;
  line-height: 1.5;
}
pre code { background: none; padding: 0; font-size: 0.85rem; overflow-wrap: normal; }

.table-wrap { overflow-x: auto; margin: 16px 0; }
table { border-collapse: collapse; font-size: 0.93rem; }
th, td { border: 1px solid var(--border); padding: 6px 12px; vertical-align: top; }
th { background: var(--bg-soft); text-align: left; }
td { overflow-wrap: normal; word-break: normal; }

blockquote {
  margin: 16px 0;
  padding: 4px 16px;
  border-left: 4px solid var(--border);
  color: var(--muted);
}
blockquote.alert { color: var(--text); }
.alert-title { font-weight: 700; margin-bottom: 4px; }
.alert-note { border-left-color: var(--note); }
.alert-note .alert-title { color: var(--note); }
.alert-tip { border-left-color: var(--tip); }
.alert-tip .alert-title { color: var(--tip); }
.alert-important { border-left-color: var(--important); }
.alert-important .alert-title { color: var(--important); }
.alert-warning { border-left-color: var(--warning); }
.alert-warning .alert-title { color: var(--warning); }
.alert-caution { border-left-color: var(--caution); }
.alert-caution .alert-title { color: var(--caution); }

details {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 16px;
  margin: 16px 0;
}
summary { cursor: pointer; font-weight: 600; }
details[open] summary { margin-bottom: 8px; }

dl.sitemap { margin: 8px 0 24px; }
dl.sitemap dt { font-weight: 600; margin-top: 12px; }
dl.sitemap dd { margin: 2px 0 0 1.2em; color: var(--muted); font-size: 0.93rem; }

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
  padding: 16px;
  text-align: center;
}
.site-footer p { margin: 4px 0; }