:root {
  --bg: #fafafa;
  --fg: #141414;
  --muted: #666;
  --line: #e2e2e2;
  --accent: #1f6feb;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111; --fg: #ececec; --muted: #9a9a9a; --line: #2a2a2a; --accent: #6ea8ff; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard", "Segoe UI", sans-serif;
  word-break: keep-all;
}
main { max-width: 720px; margin: 0 auto; padding: 48px 16px 80px; }
h1 { font-size: 28px; line-height: 1.3; margin: 0 0 8px; }
h2 { font-size: 19px; margin: 36px 0 8px; }
h3 { font-size: 16px; margin: 24px 0 4px; }
p, li { color: var(--fg); }
.muted { color: var(--muted); font-size: 14px; }
a { color: var(--accent); }
nav { display: flex; gap: 16px; flex-wrap: wrap; margin: 24px 0; }
hr { border: 0; border-top: 1px solid var(--line); margin: 56px 0; }
footer { margin-top: 64px; font-size: 14px; color: var(--muted); }