body{margin:0;font-family:Arial;background:#0f0f0f;color:#fff;}
.sidebar{position:fixed;width:220px;height:100%;background:#1a1a1a;padding:20px;}
.content{margin-left:240px;padding:40px;}
.card{
background:linear-gradient(135deg,#1e1e1e,#2a2a2a);
padding:20px;margin:15px;border-radius:12px;
box-shadow:0 0 15px rgba(255,0,0,0.3);
}
.btn{background:#ff4444;padding:10px;color:#fff;text-decoration:none;}