:root { color-scheme: light dark; --ink: #1c1c1e; --muted: #6e6e73; --accent: #2a78d6; --bg: #ffffff; --card: #f5f5f7; }
@media (prefers-color-scheme: dark) { :root { --ink: #f5f5f7; --muted: #a1a1a6; --accent: #3987e5; --bg: #000000; --card: #1c1c1e; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif; }
main { max-width: 680px; margin: 0 auto; padding: 32px 20px 64px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 28px; }
header .mark { width: 56px; height: 56px; border-radius: 14px; background: linear-gradient(160deg, #3987e5, #1c5cab); flex: none; display: grid; place-items: center; }
header .mark svg { width: 36px; height: 36px; }
header h1 { font-size: 28px; margin: 0; letter-spacing: -0.01em; }
header p { margin: 2px 0 0; color: var(--muted); }
h2 { font-size: 20px; margin: 32px 0 8px; }
p, li { color: var(--ink); }
a { color: var(--accent); }
.card { background: var(--card); border-radius: 14px; padding: 16px 18px; margin: 16px 0; }
.muted { color: var(--muted); font-size: 15px; }
nav a { margin-right: 16px; }
footer { margin-top: 48px; color: var(--muted); font-size: 14px; }
dt { font-weight: 600; margin-top: 14px; }
dd { margin: 4px 0 0; }