:root { color-scheme: light dark; --bg: #f7f5f0; --text: #1d1f23; --muted: #5d636d; --rule: #dcd7cd; --accent: #1f6fd1; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { --bg: #16181b; --text: #ebe8e1; --muted: #9aa0a8; --rule: #2f3338; --accent: #5b9cf0; } }
:root[data-theme="dark"] { --bg: #16181b; --text: #ebe8e1; --muted: #9aa0a8; --rule: #2f3338; --accent: #5b9cf0; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, Arial, sans-serif; }
main { max-width: 42rem; margin: 0 auto; padding: 2.5rem 16px 4rem; }
header { display: flex; align-items: center; gap: .75rem; margin-bottom: 2rem; }
header img { width: 44px; height: 44px; border-radius: 10px; }
header a { color: var(--text); text-decoration: none; font-weight: 600; font-size: 1.1rem; }
nav { margin-left: auto; font-size: .95rem; }
nav a { color: var(--accent); text-decoration: none; margin-left: 1rem; }
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 1rem; }
h2 { font-size: 1.35rem; margin: 2.5rem 0 .5rem; }
h3 { font-size: 1.05rem; margin: 1.5rem 0 .25rem; }
p, ul { margin: 0 0 1rem; }
ul { padding-left: 1.25rem; }
li { margin-bottom: .35rem; }
hr { border: 0; border-top: 1px solid var(--rule); margin: 2rem 0; }
a { color: var(--accent); }
.muted { color: var(--muted); }
footer { margin-top: 3rem; font-size: .9rem; color: var(--muted); }