:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  color: #1f2937;
  background: #fff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: #fff;
}

main {
  width: min(100% - 32px, 920px);
  margin: 0 auto;
  padding: 40px 0 calc(48px + env(safe-area-inset-bottom));
}

article {
  background: #fff;
  padding: clamp(24px, 5vw, 56px);
}

h1 {
  margin: 0 0 36px;
  color: #111827;
  font-size: clamp(26px, 4vw, 36px);
  line-height: 1.3;
  text-align: center;
}

h2 {
  margin: 32px 0 12px;
  color: #111827;
  font-size: 21px;
  line-height: 1.45;
}

h3 {
  margin: 20px 0 8px;
  color: #374151;
  font-size: 17px;
  line-height: 1.5;
}

p, li {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.8;
}

ul, ol { padding-left: 24px; }

@media (max-width: 600px) {
  main { width: min(100% - 20px, 920px); padding-top: 20px; }
  article { padding: 24px 18px; border-radius: 8px; }
  p, li { font-size: 15px; line-height: 1.75; }
}