body{font-family:Tahoma,Arial, sans-serif;background:#f6f8fa;color:#222;margin:0;padding:0;line-height:1.6}
.site-header{background:#fff;padding:18px;text-align:center;box-shadow:0 2px 8px rgba(0,0,0,0.06)}
.site-header h1{margin:0;font-size:22px}
.card{background:#fff;margin:18px auto;padding:18px;max-width:920px;border-radius:8px;box-shadow:0 2px 6px rgba(0,0,0,0.04)}
.site-footer{text-align:center;padding:16px;background:#fff;margin-top:20px}
ul{padding-left:1.2rem}
@media (max-width:640px){.card{margin:12px;padding:14px}}