:root { --bg: #f4f8fc; --card: #fff; --ink: #14202e; --dim: #52606f; --line: #dfe6ee; --accent: #6d4aff; }
@media (prefers-color-scheme: dark) { :root { --bg: #0e151d; --card: #16202b; --ink: #eef3f8; --dim: #9fb0c2; --line: #263342; --accent: #a891ff; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
h1 { font-size: 32px; line-height: 1.15; margin: 0 0 4px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
p, li { color: var(--ink); }
.dim { color: var(--dim); }
a { color: var(--accent); }
nav { display: flex; gap: 16px; margin-bottom: 32px; font-weight: 600; }
nav a { text-decoration: none; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 16px 20px; margin: 16px 0; }
ul { padding-left: 20px; }