body{margin:0;font-family:Arial;background:#f3f6fa;}
.login-box{max-width:400px;margin:80px auto;background:white;padding:30px;border-radius:12px;box-shadow:0 4px 12px rgba(0,0,0,0.1);text-align:center;}
input{width:100%;padding:12px;margin:10px 0;border:1px solid #ccc;border-radius:6px;}
button{padding:12px 20px;background:#2563eb;color:white;border:none;border-radius:6px;cursor:pointer;}
button:hover{background:#1d4ed8;}
.sidebar{width:230px;position:fixed;height:100vh;background:#1f2937;color:white;padding:25px;}
.sidebar a{display:block;color:white;text-decoration:none;margin:15px 0;}
.main{margin-left:260px;padding:30px;}
table{width:100%;background:white;border-radius:8px;border-collapse:collapse;}
th{background:#2563eb;color:white;padding:10px;}
td{padding:10px;border-bottom:1px solid #eee;}
.badge-valid{background:#10b981;padding:5px 10px;color:white;border-radius:6px;}
.badge-used{background:#ef4444;padding:5px 10px;color:white;border-radius:6px;}
.qr-box{width:320px;height:320px;background:#000;margin:auto;border-radius:12px;}