body { font-family: sans-serif; background-color: #f8f9fa; text-align: center; padding-top: 50px; }
.container { max-width: 500px; margin: 0 auto; padding: 20px; }
.card { background: white; padding: 20px; margin-bottom: 20px; border-radius: 8px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); }
h2 { color: #333; margin-bottom: 30px; }
h5 { margin: 0 0 15px 0; color: #555; }
.btn { display: block; width: 100%; padding: 15px; margin-bottom: 10px; font-size: 18px; border: none; border-radius: 5px; cursor: pointer; text-decoration: none; font-weight: bold; color: white; text-align: center; box-sizing: border-box; }
.btn-success { background-color: #28a745; }
.btn-danger { background-color: #dc3545; }
.btn-secondary { background-color: #6c757d; cursor: not-allowed; opacity: 0.6; }