*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:#1a1a1a;background:#fafaf8;line-height:1.6}
header,main,footer{max-width:820px;margin:0 auto;padding:24px}
header{display:flex;justify-content:space-between;align-items:center}
header a{color:#1a1a1a;text-decoration:none;margin-left:18px}.logo{font-weight:700;font-size:1.2rem;margin:0}
h1{font-size:2.2rem;margin:.4em 0}h2{margin-top:2em}.card{background:#fff;border:1px solid #e6e6e0;border-radius:12px;padding:20px;margin:16px 0}
a{color:#2b5bd7}footer{color:#666;font-size:.9rem;border-top:1px solid #e6e6e0}