:root {
  --bg: #fbfaf6;
  --ink: #1f2430;
  --muted: #5d6472;
  --line: #e4e1d8;
  --accent: #23395d;
  --accent-soft: #e9edf4;
  --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171d;
    --ink: #e8e6e1;
    --muted: #a3a8b3;
    --line: #2b303a;
    --accent: #9db4dc;
    --accent-soft: #1d2533;
    --card: #1a1e26;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic", "Noto Sans JP", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0.02em;
}
a { color: var(--accent); }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header.site { border-bottom: 1px solid var(--line); }
header.site .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-weight: 700; font-size: 18px; color: var(--ink); text-decoration: none; letter-spacing: 0.08em; }
nav a { color: var(--muted); text-decoration: none; font-size: 14px; margin-left: 20px; }
nav a:hover { color: var(--ink); }
main { padding: 56px 0 80px; }
h1 { font-size: 28px; line-height: 1.5; margin: 0 0 16px; letter-spacing: 0.04em; }
h2 { font-size: 20px; margin: 48px 0 12px; padding-top: 8px; }
h3 { font-size: 17px; margin: 28px 0 8px; }
p, li { color: var(--ink); }
.lead { color: var(--muted); font-size: 17px; margin-bottom: 40px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 24px;
  margin: 16px 0;
}
.card h3 { margin-top: 0; }
.badge {
  display: inline-block;
  font-size: 12px;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  margin-left: 8px;
  vertical-align: middle;
}
table { width: 100%; border-collapse: collapse; margin: 12px 0; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { width: 30%; color: var(--muted); font-weight: 600; white-space: nowrap; }
.doc h2 { font-size: 18px; }
.doc ol, .doc ul { padding-left: 1.4em; }
.small { color: var(--muted); font-size: 14px; }
footer.site { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 13px; }
footer.site a { color: var(--muted); margin-right: 16px; }
@media (max-width: 520px) {
  h1 { font-size: 23px; }
  main { padding: 36px 0 56px; }
  nav a { margin-left: 14px; }
  th { width: auto; white-space: normal; }
}