:root {
  color-scheme: light;
  --ink: #10131a;
  --muted: #667085;
  --line: #dfe6ef;
  --soft: #f3f6fa;
  --blue: #4267ff;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 100px; }
body { margin: 0; color: var(--ink); background: #fff; line-height: 1.65; }
a { color: var(--blue); text-underline-offset: 3px; overflow-wrap: anywhere; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 2px solid var(--blue); outline-offset: 4px; }
.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
}
.brand { color: var(--ink); font-size: 20px; font-weight: 800; text-decoration: none; }
.nav-links { display: flex; flex-wrap: wrap; gap: 8px 20px; font-size: 14px; }
.nav-links a { color: var(--muted); text-decoration: none; }
.nav-links a[aria-current="page"] { color: var(--ink); text-decoration: underline; }
main { width: min(820px, calc(100% - 48px)); margin: 48px auto 64px; }
h1 { margin: 0 0 12px; font-size: 36px; line-height: 1.2; letter-spacing: 0; overflow-wrap: anywhere; }
h2 { margin: 0 0 14px; font-size: 23px; line-height: 1.3; letter-spacing: 0; }
h3 { margin: 22px 0 8px; font-size: 17px; line-height: 1.4; letter-spacing: 0; }
p { margin: 0 0 16px; }
ul, ol { margin: 0 0 18px; padding-left: 24px; }
li { margin: 6px 0; }
.updated { margin-bottom: 24px; color: var(--muted); font-size: 14px; }
.intro { font-size: 18px; }
.contents { margin: 28px 0 36px; padding: 18px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.contents strong { display: block; margin-bottom: 10px; }
.contents ul { display: flex; flex-wrap: wrap; gap: 8px 22px; padding: 0; margin: 0; list-style: none; font-size: 14px; }
section { margin-top: 36px; scroll-margin-top: 24px; }
dl { margin: 0 0 18px; }
dt { margin-top: 12px; font-weight: 700; }
dd { margin: 2px 0 0; overflow-wrap: anywhere; }
.notice { padding: 16px 18px; background: var(--soft); border-left: 3px solid var(--blue); }
.notice p:last-child { margin-bottom: 0; }
footer { padding: 24px; border-top: 1px solid var(--line); background: var(--soft); }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 24px; max-width: 1120px; margin: 0 auto; font-size: 14px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px 20px; }
@media (max-width: 480px) {
  .nav { padding: 16px 20px; }
  .nav-links { gap: 8px 16px; }
  main { width: calc(100% - 40px); margin-top: 32px; }
  h1 { font-size: 30px; }
  h2 { font-size: 21px; }
  footer { padding: 24px 20px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}