:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --text: #1d2a2e;
  --muted: #5a6a6e;
  --line: #e3e6e3;
  --brand: #0f7c7a;
  --accent: #e8664a;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111719;
    --surface: #182124;
    --text: #e6ecec;
    --muted: #9fb0b2;
    --line: #2a3639;
    --brand: #4fc2bd;
    --accent: #f28b72;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--brand); }
header.site, footer.site {
  max-width: 760px;
  margin: 0 auto;
  padding: 20px 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  align-items: center;
  justify-content: space-between;
}
header.site { border-bottom: 1px solid var(--line); }
footer.site { border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; margin-top: 48px; }
.logo { font-weight: 700; font-size: 20px; text-decoration: none; color: var(--text); letter-spacing: -0.01em; }
.logo span { color: var(--accent); }
nav a { margin-left: 16px; text-decoration: none; font-size: 15px; }
nav a:first-child { margin-left: 0; }
main { max-width: 760px; margin: 0 auto; padding: 8px 16px; }
h1 { font-size: 2rem; line-height: 1.2; margin: 32px 0 4px; letter-spacing: -0.02em; }
h2 { font-size: 1.25rem; margin: 40px 0 8px; padding-top: 8px; }
h3 { font-size: 1.05rem; margin: 24px 0 4px; }
.meta { color: var(--muted); font-size: 15px; margin: 0 0 24px; }
.summary {
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 4px solid var(--brand);
  border-radius: 8px;
  padding: 12px 20px;
  margin: 24px 0;
}
.summary ul { padding-left: 20px; margin: 8px 0; }
table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 12px 0; display: block; overflow-x: auto; }
th, td { text-align: left; vertical-align: top; padding: 8px 10px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; }
.toc { columns: 2; column-gap: 32px; padding-left: 20px; font-size: 15px; }
@media (max-width: 560px) { .toc { columns: 1; } h1 { font-size: 1.6rem; } }
.hero { padding: 72px 0 40px; }
.hero p { font-size: 1.15rem; color: var(--muted); max-width: 560px; }