:root {
  color-scheme: light dark;
  --bg: #fafaf8;
  --fg: #1f2328;
  --muted: #59636e;
  --line: #d9dee3;
  --accent: #0b5cad;
  --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171a;
    --fg: #e6e9ec;
    --muted: #9aa4ae;
    --line: #2d343b;
    --accent: #7cb4f5;
    --card: #1c2126;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 0 16px 48px;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.7 -apple-system, "Segoe UI", "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", sans-serif;
}
header, main, footer { max-width: 760px; margin: 0 auto; }
header { padding: 32px 0 8px; border-bottom: 1px solid var(--line); }
header .brand { font-size: 1.5rem; font-weight: 700; margin: 0; }
header .brand a { color: inherit; text-decoration: none; }
header .tagline { color: var(--muted); margin: 4px 0 12px; }
nav { display: flex; flex-wrap: wrap; gap: 4px 20px; padding: 8px 0 12px; }
nav a { color: var(--accent); text-decoration: none; }
nav a[aria-current="page"] { font-weight: 600; text-decoration: underline; }
main { padding-top: 16px; }
h1 { font-size: 1.6rem; margin: 24px 0 8px; }
h2 { font-size: 1.15rem; margin: 32px 0 8px; padding-top: 12px; border-top: 1px solid var(--line); }
h3 { font-size: 1rem; margin: 20px 0 4px; }
p, li { margin: 6px 0; }
ul { padding-left: 1.4em; }
a { color: var(--accent); }
code { font-family: Consolas, "SFMono-Regular", Menlo, monospace; font-size: 0.92em; background: var(--card); border: 1px solid var(--line); border-radius: 4px; padding: 0 4px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 12px 16px; margin: 16px 0; }
.meta { color: var(--muted); font-size: 0.9rem; }
.lang { color: var(--muted); font-size: 0.85rem; letter-spacing: 0.04em; text-transform: uppercase; margin: 40px 0 0; }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.9rem; }