:root { --bg: #f4f8fc; --card: #ffffff; --text: #0f172a; --muted: #475569; --accent: #0284c7; }
@media (prefers-color-scheme: dark) { :root { --bg: #0b1220; --card: #111a2e; --text: #e2e8f0; --muted: #94a3b8; --accent: #38bdf8; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 40px 16px 64px; }
.card { background: var(--card); border-radius: 20px; padding: 28px 24px; }
h1 { font-size: 30px; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 28px 0 6px; }
h3 { font-size: 16px; margin: 18px 0 4px; }
p, li { color: var(--muted); }
strong { color: var(--text); }
a { color: var(--accent); }
.brand { font-weight: 900; letter-spacing: 0.5px; color: var(--accent); margin-bottom: 12px; display: block; text-decoration: none; }
footer { text-align: center; color: var(--muted); font-size: 13px; margin-top: 24px; }