:root {
  --bg: #f7f5f2;
  --fg: #1f2933;
  --muted: #6b7280;
  --accent: #2f7d4f;
  --link: #1e5d3a;
  --card: #ffffff;
  --border: #e5e7eb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181f;
    --fg: #e6e8eb;
    --muted: #9aa1a8;
    --accent: #6fc28b;
    --link: #8fd3a4;
    --card: #1c2027;
    --border: #2a313a;
  }
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 20px 80px;
}

header.site {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--card);
}
header.site .logo {
  font-size: 22px;
}
header.site h1 {
  font-size: 18px;
  margin: 0;
  font-weight: 600;
}

main h1 {
  font-size: 26px;
  margin: 24px 0 8px;
  line-height: 1.3;
}
main h2 {
  font-size: 18px;
  margin: 28px 0 8px;
  color: var(--accent);
}
main p, main li {
  font-size: 15px;
}
main .meta {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 24px;
}

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

ul { padding-left: 22px; }
li { margin: 4px 0; }

.lang-switch {
  margin: 16px 0 24px;
  font-size: 14px;
}
.lang-switch a {
  margin-right: 12px;
}

.toc {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 18px;
  margin: 16px 0 28px;
}
.toc h3 {
  margin: 0 0 8px;
  font-size: 14px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.toc ol {
  margin: 0;
  padding-left: 20px;
  font-size: 14px;
}

footer.site {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}
footer.site a { color: var(--muted); }