:root {
  --bg: #f7f7fb;
  --surface: #ffffff;
  --text: #1c1b29;
  --muted: #5d5b72;
  --accent: #4b45d6;
  --border: #e3e2ee;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12111c;
    --surface: #1b1a28;
    --text: #ecebf5;
    --muted: #a3a1b8;
    --accent: #9d98ff;
    --border: #2c2a3d;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header { border-bottom: 1px solid var(--border); }
header .wrap { display: flex; align-items: center; gap: 12px; height: 64px; }
header img { width: 32px; height: 32px; }
header .name { font-weight: 700; font-size: 18px; color: var(--text); text-decoration: none; }
header nav { margin-left: auto; display: flex; gap: 18px; font-size: 14px; }
header nav a { color: var(--muted); text-decoration: none; }
header nav a:hover, header nav a[aria-current] { color: var(--text); }
main { padding: 48px 0 72px; }
.hero { text-align: center; padding: 24px 0 40px; }
.hero img { width: 120px; height: 120px; }
.hero h1 { font-size: 40px; margin: 16px 0 8px; letter-spacing: -0.02em; }
.hero p { color: var(--muted); font-size: 18px; margin: 0 auto; max-width: 560px; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px 28px;
  margin: 20px 0;
}
.card h2 { margin-top: 0; font-size: 20px; }
h1.doc { font-size: 32px; margin: 0 0 4px; letter-spacing: -0.01em; }
.meta { color: var(--muted); font-size: 14px; margin-bottom: 32px; }
h2 { font-size: 21px; margin: 36px 0 8px; }
h3 { font-size: 17px; margin: 24px 0 4px; }
ul { padding-left: 22px; }
li { margin: 4px 0; }
.lang { border-top: 1px solid var(--border); margin-top: 56px; padding-top: 32px; }
footer { border-top: 1px solid var(--border); color: var(--muted); font-size: 14px; }
footer .wrap { padding: 24px 20px; display: flex; flex-wrap: wrap; gap: 8px 20px; }
@media (max-width: 520px) {
  header nav { gap: 12px; font-size: 13px; }
  .hero h1 { font-size: 32px; }
  .card { padding: 20px; }
}