:root {
  color-scheme: light dark;
  --bg: #f4f8fc;
  --card: #ffffff;
  --fg: #142033;
  --muted: #667085;
  --accent: #1789d5;
  --border: #dce7f1;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1520;
    --card: #142131;
    --fg: #edf6ff;
    --muted: #a9b9ca;
    --accent: #62bcf4;
    --border: #26394c;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--fg);
  background: linear-gradient(160deg, var(--bg), color-mix(in srgb, var(--accent) 8%, var(--bg)));
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic UI", system-ui, sans-serif;
}
main {
  max-width: 800px;
  min-height: 100vh;
  margin: 0 auto;
  padding: 48px 24px 96px;
}
.hero, section {
  background: color-mix(in srgb, var(--card) 94%, transparent);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 28px;
  box-shadow: 0 18px 48px rgba(20, 32, 51, 0.07);
}
section { margin-top: 20px; }
h1 { margin: 0 0 8px; font-size: clamp(2rem, 8vw, 3.3rem); line-height: 1.12; }
h2 { margin: 34px 0 8px; font-size: 1.2rem; }
section h2:first-child { margin-top: 0; }
p { margin: 10px 0; }
ul { padding-left: 1.35rem; }
li { margin: 6px 0; }
a { color: var(--accent); font-weight: 650; }
.meta, footer { color: var(--muted); font-size: 0.9rem; }
.links { display: grid; gap: 12px; margin-top: 24px; }
.links a {
  display: block;
  padding: 14px 16px;
  color: var(--fg);
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--card);
}
.lang { display: flex; gap: 14px; margin-bottom: 22px; }
.notice {
  padding: 14px 16px;
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  background: color-mix(in srgb, var(--accent) 10%, var(--card));
}
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
hr { margin: 48px 0; border: 0; border-top: 1px solid var(--border); }
footer { margin-top: 40px; text-align: center; }
@media (max-width: 560px) {
  main { padding: 24px 14px 64px; }
  .hero, section { padding: 22px 18px; border-radius: 18px; }
}