:root { --max: 960px; }
* { box-sizing: border-box; }
body { font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif; margin:0; line-height:1.6; }
header, main, footer { max-width: var(--max); margin: 0 auto; padding: 1rem; }
header { display:flex; justify-content:space-between; align-items:center; border-bottom:1px solid #eee; }
nav a { margin-left: 1rem; }
form { display:grid; gap:.5rem; max-width:520px; }
input, textarea { width:100%; padding:.5rem; }
button { padding:.5rem .75rem; cursor:pointer; }