:root { --bg: #f4fbfb; --fg: #12302f; --muted: #4a6665; --accent: #0f8b8d; --card: #ffffff; }
@media (prefers-color-scheme: dark) { :root { --bg: #0d1f1f; --fg: #e6f4f3; --muted: #a3c2c0; --accent: #4fd1c5; --card: #142b2b; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
h1 { font-size: 2rem; margin: 0 0 4px; }
h2 { font-size: 1.2rem; margin-top: 2em; }
a { color: var(--accent); }
.muted { color: var(--muted); }
nav { display: flex; gap: 16px; margin-bottom: 24px; flex-wrap: wrap; }
.card { background: var(--card); border-radius: 14px; padding: 16px 20px; margin: 16px 0; }