*{box-sizing:border-box}body{margin:0;font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:#222;background:#f6f7f9}
header,footer{background:#0b4f6c;color:#fff;padding:12px 16px}header a,footer a{color:#fff}main{max-width:760px;margin:auto;padding:16px}
a{color:#0b4f6c}.card{background:#fff;border-radius:10px;padding:16px;margin:12px 0;box-shadow:0 1px 3px #0001}
.btn{display:inline-block;padding:12px 18px;border-radius:8px;background:#0b8f5a;color:#fff;text-decoration:none;font-weight:600;margin:4px 4px 4px 0}
.btn.off{background:#999;cursor:not-allowed}.preview{background:#fff;border:1px solid #ddd;padding:16px;white-space:normal}
.preview table{border-collapse:collapse;width:100%}.preview td,.preview th{border:1px solid #ccc;padding:4px}h1{font-size:1.6rem;line-height:1.25}
nav a{margin-right:12px}ul.list li{margin:6px 0}