body{font-family:system-ui,Arial,sans-serif;margin:0;color:#111}
header,footer{background:#0ea5e9;color:#fff;padding:16px}
main{padding:24px;max-width:900px;margin:0 auto}
h1{margin:0 0 8px}
.btn{display:inline-block;padding:10px 16px;background:#111;color:#fff;text-decoration:none;border-radius:6px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.card{border:1px solid #eee;border-radius:8px;padding:16px}
.small{font-size:12px;color:#555}
.notice{background:#ecfeff;border:1px solid #67e8f9;padding:12px;border-radius:8px}