:root {
  color-scheme: light dark;
  --page: #f2f6f6; --surface: #ffffff; --text: #182e35;
  --muted: #465e66; --link: #08685b; --border: #d3dfdf; --notice: #edf7f3;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; padding: clamp(12px, 3vw, 32px); background: var(--page); color: var(--text); font: 1rem/1.75 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
main { max-width: 900px; margin: 0 auto; padding: clamp(20px, 5vw, 44px); background: var(--surface); border: 1px solid var(--border); border-radius: 18px; }
h1 { margin: 16px 0 8px; font-size: clamp(1.9rem, 4vw, 2.6rem); line-height: 1.2; letter-spacing: -.025em; }
h2 { margin: 32px 0 10px; font-size: 1.3rem; line-height: 1.4; }
h3 { margin: 20px 0 8px; font-size: 1.05rem; }
p, li { color: var(--muted); }
p { margin: 12px 0; }
ul { padding-left: 24px; }
li + li { margin-top: 4px; }
a { color: var(--link); text-decoration: underline; text-underline-offset: .2em; overflow-wrap: anywhere; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 3px solid var(--link); outline-offset: 4px; border-radius: 2px; }
.languages { font-size: .95rem; }
.languages a { padding: 4px 0; }
.languages a[aria-current="page"] { font-weight: 750; }
.meta { margin-top: 10px; font-size: .95rem; }
.notice { padding: 16px 20px; border-left: 4px solid var(--link); border-radius: 0 8px 8px 0; background: var(--notice); color: var(--text); }
.contents { padding: 14px 0 20px; border-bottom: 1px solid var(--border); }
.contents ul { display: flex; flex-wrap: wrap; gap: 6px 20px; list-style: none; padding: 0; margin: 8px 0 0; }
.contents li { margin: 0; }
section { scroll-margin-top: 20px; }
footer { margin-top: 36px; padding-top: 18px; border-top: 1px solid var(--border); color: var(--muted); font-size: .9rem; }
@media (prefers-color-scheme: dark) {
  :root { --page: #101b20; --surface: #17272d; --text: #eff7f7; --muted: #c3d4d9; --link: #7de3d2; --border: #344953; --notice: #203b37; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
@media print {
  :root { --page: #fff; --surface: #fff; --text: #000; --muted: #222; --link: #000; --border: #aaa; --notice: #fff; }
  body, main { padding: 0; border: 0; }
  .contents { display: none; }
  h2, h3 { break-after: avoid; }
}