:root { color-scheme: light dark; --fg: #1d1d1f; --muted: #6e6e73; --bg: #fbfbfd; --line: #e5e5ea; --accent: #2f6fe4; }
@media (prefers-color-scheme: dark) { :root { --fg: #f2f2f7; --muted: #a1a1a6; --bg: #121214; --line: #2c2c30; --accent: #6ea0ff; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.7 system-ui, -apple-system, "Segoe UI", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif; }
header, main, footer { max-width: 720px; margin: 0 auto; padding: 0 20px; }
header { display: flex; gap: 20px; align-items: center; padding-top: 28px; }
header a { color: var(--muted); text-decoration: none; }
header .brand { color: var(--fg); font-weight: 700; margin-right: auto; }
h1 { font-size: 2rem; line-height: 1.3; margin: 48px 0 8px; }
h2 { font-size: 1.25rem; margin: 40px 0 8px; }
.muted { color: var(--muted); }
a { color: var(--accent); }
.button { display: inline-block; margin: 16px 0; padding: 10px 18px; border-radius: 10px; background: var(--accent); color: #fff; text-decoration: none; font-weight: 600; }
hr { border: 0; border-top: 1px solid var(--line); margin: 56px 0; }
footer { padding-top: 24px; padding-bottom: 48px; color: var(--muted); font-size: 0.875rem; }