body{display:flex;justify-content:center;align-items:center;height:100vh;margin:0;background:linear-gradient(135deg,#000,#31385a);font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}.app-container{display:flex;flex-direction:column;align-items:center}.title{font-size:30px;font-weight:700;color:#fff;margin-bottom:15px;text-align:center;white-space:nowrap}.calculator{background:#373838;padding:25px;border-radius:20px;box-shadow:0 8px 20px #00000080;text-align:center;width:380px;margin:auto}.display{background:#5a63b4;height:70px;border-radius:12px;padding:15px;font-size:30px;font-weight:700;color:#fff;overflow:hidden;margin-bottom:20px;display:flex;align-items:center;justify-content:right}.buttons{display:grid;grid-template-columns:repeat(4,1fr);grid-gap:12px}button{height:60px;border:none;border-radius:12px;font-size:20px;font-weight:700;cursor:pointer;transition:.2s ease-in-out;width:100%}button:hover{transform:scale(1.05);opacity:.9}.owner-name{color:#bbb6b6}.number{background:#757474;color:#ecf0f1}.operator{background:#dd5303;color:#fff}.clear,.equal{background:#e72c0b;color:#fff}.surname{grid-column:span 4;background:#5b5b5c;color:#fff;font-weight:700;font-size:30px}