:root { color-scheme: light dark; --ink: #1d1d1f; --paper: #fbfbfd; --accent: #3b5bdb; }
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.6 system-ui, sans-serif; color: var(--ink); background: var(--paper); }
header, main, footer { max-width: 46rem; margin: 0 auto; padding: 1rem; }
header { display: flex; justify-content: space-between; align-items: baseline; }
.brand { font-weight: 700; font-size: 1.25rem; text-decoration: none; color: var(--ink); }
nav a { margin-left: 1rem; color: var(--accent); }
h1 { line-height: 1.2; }
form label { display: block; margin: 0.75rem 0; }
footer { color: #6e6e73; font-size: 0.875rem; }