body{margin:0;padding:0;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background-color:#f5f5f5}*{box-sizing:border-box}.container{max-width:1200px;margin:0 auto;padding:20px}.btn{padding:10px 20px;border:none;border-radius:4px;cursor:pointer;font-size:14px;transition:background-color .3s}.btn-primary{background-color:#007bff;color:#fff}.btn-primary:hover{background-color:#0056b3}.card{background:white;border-radius:8px;box-shadow:0 2px 4px #0000001a;padding:20px;margin-bottom:20px}