:root {
  color-scheme: light dark;
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo",
    "Noto Sans KR", sans-serif;
  --accent: #1677a8;
  --surface: color-mix(in srgb, Canvas 94%, var(--accent) 6%);
  --muted: color-mix(in srgb, CanvasText 60%, Canvas 40%);
}

* { box-sizing: border-box; }
body { margin: 0; background: Canvas; color: CanvasText; line-height: 1.7; }
header, main, footer { width: min(760px, calc(100% - 40px)); margin: 0 auto; }
header { padding: 52px 0 24px; }
nav { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 20px; }
a { color: var(--accent); }
h1 { margin: 0; font-size: clamp(2rem, 7vw, 3.3rem); }
h2 { margin-top: 2.4rem; }
.lead { color: var(--muted); font-size: 1.08rem; }
.card { padding: 20px; margin: 16px 0; border-radius: 18px; background: var(--surface); }
footer { padding: 44px 0; color: var(--muted); font-size: .9rem; }
code { overflow-wrap: anywhere; }