:root{--bg:#f6f6f4;--fg:#1f2430;--mut:#5d6470;--acc:#9a3b2e}
*{box-sizing:border-box}body{margin:0;font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--fg)}
header,main,footer{max-width:760px;margin:0 auto;padding:20px 16px}header{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #dedfe2}
header b{font-size:18px}nav a{margin-left:16px;color:var(--acc);text-decoration:none}h1{font-size:30px;margin:28px 0 8px}p{color:var(--mut)}
.card{background:#fff;border:1px solid #e4e5e8;border-radius:10px;padding:16px 20px;margin:16px 0}footer{color:var(--mut);font-size:13px;border-top:1px solid #dedfe2;margin-top:40px}