:root {
  color-scheme: light dark;
  --background: #fff;
  --foreground: #222;
  --strong: #000;
  --link: #00e;
  --border: #222;
  --muted: #595959;
  font-family: Sarabun, Arial, sans-serif;
  font-size: 20px;
  line-height: 1.5;
  color: var(--foreground);
  background: var(--background);
  font-synthesis: none;
}

* { box-sizing: border-box; }
body { margin: 0; }
main { max-width: 808px; margin: 0 auto; padding: 24px 20px 32px; }
header { display: flex; align-items: center; gap: 12px; border-bottom: 1px solid var(--border); padding-bottom: 16px; font-size: 32px; font-weight: 700; color: var(--strong); }
.eyebrow { margin: 16px 0 28px; font-size: 16px; color: var(--muted); }
h1 { margin: 0 0 20px; font-size: clamp(30px, 5vw, 40px); line-height: 1.2; color: var(--strong); }
.intro { margin: 0 0 16px; }
a { color: var(--link); text-decoration: none; text-underline-offset: 4px; }
a:hover { text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--link); outline-offset: 5px; }
strong { color: var(--strong); }
ol { padding-left: 28px; margin: 32px 0; }
li { padding-left: 4px; margin-bottom: 24px; }
li::marker { color: var(--muted); }
.links { display: flex; align-items: center; flex-wrap: wrap; gap: 12px 24px; margin-top: 16px; font-size: 16px; }
.primary { display: inline-block; padding: 10px 14px; border: 1px solid var(--link); font-weight: 700; }
.primary:hover { background: var(--link); color: var(--background); text-decoration: none; }
.note { font-size: 14px; color: var(--muted); }
.privacy { border-top: 1px solid var(--border); padding-top: 20px; font-size: 16px; }
footer { display: flex; flex-wrap: wrap; gap: 12px 24px; padding-top: 12px; font-size: 16px; }

@media (prefers-color-scheme: dark) {
  :root {
    --background: #16181d;
    --foreground: #d8d8d8;
    --strong: #fff;
    --link: #7ab8ff;
    --border: #666;
    --muted: #aaa;
  }
}

@media (max-width: 400px) {
  :root { font-size: 18px; }
  main { padding-top: 20px; }
  header { font-size: 28px; }
  .eyebrow { font-size: 14px; }
}