:root {
  --bg: #FAF8F5;
  --surface: #FFFFFF;
  --line: #ECE7E0;
  --ink: #0B1B2B;
  --ink-soft: #5E6873;
  --accent: #00C2FF;
  --accent-deep: #008FBF;
  --accent-wash: #CCF3FF;
  --mark: #0B1B2B;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #06121D;
    --surface: #0B1B2B;
    --line: #13293D;
    --ink: #F4F7FA;
    --ink-soft: #9DB4C6;
    --accent-deep: #6FDCFF;
    --accent-wash: #13293D;
    --mark: #13293D;
  }
}
* { box-sizing: border-box; margin: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-deep); }
.wrap { width: 100%; max-width: 760px; margin: 0 auto; padding: 0 24px; }
header .wrap { display: flex; align-items: center; justify-content: space-between; padding-top: 28px; padding-bottom: 8px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; letter-spacing: -0.02em; color: var(--ink); text-decoration: none; }
.brand-mark { width: 32px; height: 32px; border-radius: 9px; background: var(--mark); display: grid; place-items: center; }
.brand b { color: var(--accent); }
nav a { font-size: 14px; font-weight: 600; text-decoration: none; margin-left: 16px; color: var(--ink-soft); }
main { padding: 40px 0 64px; }
h1 { font-size: clamp(32px, 5vw, 44px); line-height: 1.1; letter-spacing: -0.03em; font-weight: 800; }
.updated { margin-top: 10px; color: var(--ink-soft); font-size: 15px; }
h2 { margin-top: 40px; font-size: 21px; letter-spacing: -0.01em; }
h3 { margin-top: 24px; font-size: 17px; }
p, ul, ol, table { margin-top: 12px; }
ul, ol { padding-left: 22px; }
li { margin-top: 6px; }
.lede { margin-top: 20px; font-size: 18px; color: var(--ink-soft); }
.card { margin-top: 24px; background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 22px; }
.card h2:first-child, .card h3:first-child { margin-top: 0; }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 10px 8px; border-top: 1px solid var(--line); }
th { color: var(--ink-soft); font-weight: 600; }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; padding: 24px 24px 36px; border-top: 1px solid var(--line); font-size: 14px; color: var(--ink-soft); }
footer a { color: var(--ink-soft); margin-right: 14px; }
@media (max-width: 560px) { nav { display: none; } th, td { display: block; border: 0; padding: 4px 0; } tr { display: block; border-top: 1px solid var(--line); padding: 10px 0; } }