:root { color-scheme: light dark; --accent: #2f6fde; }
* { box-sizing: border-box; }
body { margin: 0; font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
header, main, footer { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header { display: flex; align-items: center; justify-content: space-between; padding-top: 20px; padding-bottom: 8px; }
header a.logo { font-weight: 800; font-size: 22px; color: inherit; text-decoration: none; }
nav a { margin-left: 16px; color: var(--accent); text-decoration: none; }
h1 { font-size: 30px; line-height: 1.2; margin: 24px 0 8px; }
h2 { font-size: 21px; margin: 28px 0 8px; }
a { color: var(--accent); }
.muted { opacity: .65; }
.card { border: 1px solid rgba(128,128,128,.3); border-radius: 14px; padding: 16px 18px; margin: 16px 0; }
footer { padding-top: 32px; padding-bottom: 32px; font-size: 14px; }
ul { padding-left: 22px; }