:root {
  --bg: #fbfaf7;
  --text: #1f1d1a;
  --muted: #5e5a54;
  --rule: #e4e0d8;
  --accent: #5b3fb5;
  --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141316;
    --text: #ece9e3;
    --muted: #a8a39b;
    --rule: #2c2a2f;
    --accent: #b9a6ff;
    --card: #1c1b1f;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
main { max-width: 680px; margin: 0 auto; padding: 40px 16px 64px; }
header.site { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  max-width: 680px; margin: 0 auto; padding: 20px 16px 0; }
header.site a.brand { font-weight: 700; font-size: 1.15rem; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
nav a { color: var(--muted); text-decoration: none; margin-left: 16px; font-size: 0.95rem; }
nav a:first-child { margin-left: 0; }
nav a[aria-current="page"] { color: var(--text); font-weight: 600; }
h1 { font-size: 2rem; line-height: 1.2; letter-spacing: -0.02em; margin: 0 0 6px; }
h2 { font-size: 1.2rem; margin: 36px 0 8px; }
h3 { font-size: 1.02rem; margin: 22px 0 4px; }
p, li { margin: 0 0 12px; }
ul { padding-left: 1.2em; }
.meta { color: var(--muted); font-size: 0.95rem; margin-bottom: 28px; }
.summary { background: var(--card); border: 1px solid var(--rule); border-radius: 12px; padding: 16px 18px; margin: 0 0 8px; }
.summary p:last-child { margin-bottom: 0; }
a { color: var(--accent); }
footer { border-top: 1px solid var(--rule); margin-top: 48px; padding-top: 16px; color: var(--muted); font-size: 0.9rem; }