:root {
  --bg: #f4f7f5;
  --card: #ffffff;
  --ink: #1b2420;
  --muted: #5c6b65;
  --accent: #1a5c4e;
  --line: #d7e2dd;
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--ink); }
body { line-height: 1.7; }
a { color: var(--accent); }
header, main, footer { width: min(720px, calc(100% - 40px)); margin: 0 auto; }
header { padding: 28px 0 8px; }
header a.brand { color: inherit; text-decoration: none; font-weight: 700; letter-spacing: 0.04em; }
nav { display: flex; flex-wrap: wrap; gap: 12px 18px; margin: 12px 0 24px; font-size: 14px; }
main { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 28px; }
h1 { font-size: 1.5rem; margin: 0 0 8px; }
.updated { color: var(--muted); font-size: 13px; margin-bottom: 24px; }
h2 { font-size: 1.05rem; margin: 28px 0 8px; }
p, li { color: var(--ink); }
.lead { color: var(--muted); }
pre {
  white-space: pre-wrap;
  font-family: inherit;
  margin: 0;
}
footer { color: var(--muted); font-size: 13px; padding: 24px 0 40px; }