.card-checker{background:#fff;padding:30px;border-radius:12px;box-shadow:0 4px 6px #0000001a;max-width:500px;margin:0 auto}.logo-container{text-align:center;margin-bottom:25px}.logo{max-width:300px;height:auto}.input-group{margin-bottom:20px;width:100%}label{color:#333;font-weight:500;font-size:.95rem;display:block;width:100%}input{display:block;width:calc(100% - 20px);padding:10px;margin-top:8px;border:1px solid #ddd;border-radius:6px;font-size:1rem;transition:border-color .3s ease}input:focus{outline:none;border-color:#4a90e2;box-shadow:0 0 0 2px #4a90e233}.submit-button{width:100%;padding:12px;background-color:#4a90e2;color:#fff;border:none;border-radius:6px;font-size:1rem;font-weight:500;cursor:pointer;transition:background-color .3s ease}.submit-button:hover{background-color:#357abd}.loading{text-align:center;color:#666;margin-top:15px}.error{color:#dc3545;margin-top:15px;padding:10px;background-color:#dc35451a;border-radius:6px}.result{margin-top:20px;padding:15px;background-color:#f8f9fa;border-radius:6px}.table__numbers--third{margin-left:1em}body{font-family:sans-serif;background:#f9f9f9;margin:0;padding:20px}.app{max-width:500px;margin:auto}h1{text-align:center}