:root {
  --bg: #ffffff;
  --bg-2: #f4f6f8;
  --ink: #1b1f24;
  --ink-2: #4a515b;
  --ink-3: #79808a;
  --line: #e3e6ea;
  --blue: #1a73e8;
  --sans: 'Mona Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { background: var(--bg); color: var(--ink); font: 400 17px/1.65 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: var(--blue); text-underline-offset: 2px; }
header, main, footer { max-width: 720px; margin: 0 auto; padding: 0 20px; }
header { display: flex; justify-content: space-between; align-items: center; height: 64px; border-bottom: 1px solid var(--line); }
header a { color: var(--ink); text-decoration: none; font-weight: 600; }
header nav { display: flex; gap: 20px; font-size: 15px; }
header nav a { font-weight: 400; color: var(--ink-2); }
header nav a[aria-current='page'] { color: var(--ink); font-weight: 600; }
main { padding-top: 48px; padding-bottom: 72px; }
h1 { font-size: clamp(30px, 5vw, 40px); line-height: 1.15; letter-spacing: -0.02em; font-weight: 700; }
.updated { color: var(--ink-3); font-size: 15px; margin: 10px 0 36px; }
h2 { font-size: 20px; font-weight: 650; margin: 36px 0 10px; letter-spacing: -0.01em; }
p, li { color: var(--ink-2); }
p + p { margin-top: 12px; }
ul { padding-left: 22px; margin-top: 8px; }
li + li { margin-top: 6px; }
strong { color: var(--ink); font-weight: 600; }
.box { background: var(--bg-2); border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px; margin-top: 8px; }
footer { border-top: 1px solid var(--line); padding-top: 24px; padding-bottom: 40px; color: var(--ink-3); font-size: 14px; display: flex; flex-wrap: wrap; gap: 8px 20px; }
footer a { color: var(--ink-3); }
@media (max-width: 520px) { header nav { gap: 14px; font-size: 14px; } }