body{background:#0d0d0d;color:#f2f2f2;font-family:Arial,Helvetica,sans-serif;margin:0;}
a{color:#ff4d4d;text-decoration:none;}
header,footer{background:#1a1a1a;padding:20px;text-align:center;}
main{max-width:920px;margin:40px auto;padding:0 20px;line-height:1.6;}
h1,h2,h3{color:#fff;margin:25px 0 10px;}
.btn{display:inline-block;padding:12px 18px;background:#ff4d4d;color:#fff;border-radius:6px;margin:15px 0;}
.notice{background:#262626;padding:15px;border-left:4px solid #ff4d4d;margin:20px 0;font-size:14px;}
.center{text-align:center;}
.video-embed{margin:25px 0;text-align:center;}
.video-embed iframe{width:100%;height:56vw;max-height:420px;}
@media (max-width:480px){
  body{font-size:17px;}
  .btn{padding:16px 22px;font-size:18px;}
  main{padding:0 12px;}
  header,footer{padding:15px;}
}