*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background-color:#f5f5f5;color:#333;line-height:1.6}.container{max-width:600px;margin:0 auto;padding:20px}.card{background:#fff;border-radius:12px;box-shadow:0 4px 6px #0000001a;padding:30px;margin:20px 0}.btn{display:inline-block;padding:12px 24px;border:none;border-radius:6px;cursor:pointer;font-size:16px;font-weight:500;text-decoration:none;text-align:center;transition:all .3s ease}.btn:hover{transform:translateY(-2px);box-shadow:0 4px 8px #00000026}.btn-primary{background-color:#007bff;color:#fff}.btn-primary:hover{background-color:#0056b3}.btn-success{background-color:#28a745;color:#fff}.btn-success:hover{background-color:#1e7e34}.text-center{text-align:center}.mb-3{margin-bottom:1rem}.mb-4{margin-bottom:1.5rem}.loading{display:flex;justify-content:center;align-items:center;min-height:200px}.spinner{border:3px solid #f3f3f3;border-top:3px solid #007bff;border-radius:50%;width:40px;height:40px;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@media (max-width: 620px){.container{padding:10px}.card{padding:20px;margin:10px 0}}