:root { --bg: #f4f5f7; --surface: #fff; --text: #101828; --muted: #667085; --line: #e4e7ec; --accent: #1f9d55; }
@media (prefers-color-scheme: dark) { :root { --bg: #0b141a; --surface: #111b21; --text: #e9edef; --muted: #8696a0; --line: #222e35; --accent: #25c16f; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 24px; }
h1 { font-size: 28px; line-height: 1.25; margin: 0 0 4px; }
h2 { font-size: 18px; margin: 28px 0 6px; }
.muted { color: var(--muted); font-size: 14px; }
a { color: var(--accent); }
nav { display: flex; gap: 16px; margin-bottom: 16px; font-size: 14px; }
.brand { font-weight: 700; color: var(--text); text-decoration: none; margin-right: auto; }