/* Reset */
*{margin:0;padding:0;box-sizing:border-box;}
body{font-family:Arial,Helvetica,sans-serif;line-height:1.6;background:#f5f5f5;color:#333;padding:20px;}
header{background:#4a90e2;color:#fff;padding:20px;text-align:center;}
h1{margin:0;font-size:2rem;}
.container{max-width:960px;margin:0 auto;background:#fff;padding:20px;box-shadow:0 2px 4px rgba(0,0,0,0.1);}
@media (max-width:600px){header{padding:15px;}h1{font-size:1.5rem;}}