:root{--navy:#1e2a3b;--blue:#33689a;--text:#28364a;--muted:#5a6a80;--border:#e2e7ed}
*{box-sizing:border-box}body{margin:0;font:16px/1.7 system-ui,sans-serif;color:var(--text);background:#f5f6f4}
header,main,footer{max-width:900px;margin:auto;padding:24px}header{display:flex;justify-content:space-between;align-items:center}
a{color:var(--blue)}main{background:#fff;border:1px solid var(--border);border-radius:18px}h1,h2{color:var(--navy);line-height:1.25}
h1{font-size:32px}h2{font-size:20px;margin-top:30px}.notice{background:#fff4d6;padding:14px;border-radius:10px}
footer{font-size:13px;color:var(--muted)}