:root {
  color-scheme: light;
  --background: #ffffff;
  --foreground: #1f2328;
  --muted: #656d76;
  --border: #d0d7de;
  --subtle: #f6f8fa;
  --accent: #0969da;
  --header-bg: rgba(255, 255, 255, 0.92);
  --code-bg: rgba(175, 184, 193, 0.2);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--background);
  color: var(--foreground);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

.site-header {
  position: sticky;
  z-index: 10;
  top: 0;
  display: flex;
  min-height: 58px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 10px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--header-bg);
  backdrop-filter: blur(12px);
}

.brand {
  color: var(--foreground);
  font-size: 17px;
  font-weight: 650;
  text-decoration: none;
}

.document-nav select {
  max-width: min(50vw, 360px);
  padding: 7px 32px 7px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--background);
  color: var(--foreground);
  font: inherit;
}

.page-shell {
  width: min(100% - 40px, 760px);
  margin: 0 auto;
  padding: 64px 0 96px;
}

.document-index h1 { margin-top: 0; }

.page-table {
  width: 100%;
  border-spacing: 0;
  border-collapse: collapse;
}

.page-table th,
.page-table td {
  padding: 12px 14px;
  border: 1px solid var(--border);
  text-align: left;
}

.page-table th { background: var(--subtle); }
.page-table code { white-space: nowrap; }
.muted { color: var(--muted); }

.not-found {
  padding: 72px 0;
  text-align: center;
}

.not-found-code {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 64px;
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
}

.not-found h1 {
  margin: 0 0 12px;
  font-size: 28px;
}

.not-found .muted { margin: 0 0 24px; }

.back-link {
  display: inline-block;
  padding: 9px 15px;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--foreground);
  font-weight: 600;
  text-decoration: none;
}

.back-link:hover {
  border-color: var(--muted);
  background: var(--subtle);
}

.markdown-body {
  overflow-wrap: break-word;
  font-size: 16px;
  line-height: 1.65;
}

.markdown-body > :first-child { margin-top: 0 !important; }
.markdown-body > :last-child { margin-bottom: 0 !important; }

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  line-height: 1.25;
  margin: 32px 0 16px;
  font-weight: 650;
}

.markdown-body h1 {
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border);
  font-size: 2em;
}

.markdown-body h2 {
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border);
  font-size: 1.5em;
}

.markdown-body h3 { font-size: 1.25em; }
.markdown-body p,
.markdown-body blockquote,
.markdown-body ul,
.markdown-body ol,
.markdown-body table,
.markdown-body pre { margin: 0 0 16px; }
.markdown-body ul,
.markdown-body ol { padding-left: 2em; }
.markdown-body li + li { margin-top: 0.25em; }

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

.markdown-body blockquote {
  padding: 0 1em;
  border-left: 0.25em solid var(--border);
  color: var(--muted);
}

.markdown-body code {
  padding: 0.2em 0.4em;
  border-radius: 6px;
  background: var(--code-bg);
  font: 85% ui-monospace, SFMono-Regular, Consolas, monospace;
}

.markdown-body pre {
  overflow: auto;
  padding: 16px;
  border-radius: 6px;
  background: var(--subtle);
}

.markdown-body pre code { padding: 0; background: transparent; font-size: 100%; }
.markdown-body table { display: block; max-width: 100%; overflow: auto; border-spacing: 0; border-collapse: collapse; }
.markdown-body th,
.markdown-body td { padding: 6px 13px; border: 1px solid var(--border); }
.markdown-body tr:nth-child(2n) { background: var(--subtle); }
.markdown-body img { max-width: 100%; height: auto; }
.markdown-body hr { height: 0.25em; margin: 24px 0; border: 0; background: var(--border); }

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --background: #0d1117;
    --foreground: #e6edf3;
    --muted: #8d96a0;
    --border: #30363d;
    --subtle: #161b22;
    --accent: #58a6ff;
    --header-bg: rgba(13, 17, 23, 0.9);
    --code-bg: rgba(110, 118, 129, 0.4);
  }
}

@media (max-width: 600px) {
  .site-header { padding-inline: 16px; }
  .page-shell { width: min(100% - 28px, 760px); padding-top: 40px; }
  .page-table th:last-child,
  .page-table td:last-child { display: none; }
  .markdown-body { font-size: 15px; }
}