:root { color-scheme: dark; font-family: system-ui, sans-serif; background: #10151e; color: #e9eef6; }
body { margin: 0; line-height: 1.7; }
main { max-width: 800px; margin: auto; padding: 48px 24px; }
nav, footer { padding: 18px 0; }
a { color: #80d9ff; }
h1, h2 { line-height: 1.2; }
h1 { font-size: clamp(2.2rem, 6vw, 3.5rem); }
h2 { margin-top: 2rem; }
.intro { font-size: 1.2rem; }
footer { margin-top: 40px; border-top: 1px solid #354152; }