body{font-family:Arial,sans-serif;margin:0;padding:0;background:#f4f4f4;display:flex;justify-content:center;align-items:center;min-height:100vh}.container{background:#fff;padding:2rem;border-radius:8px;max-width:400px;width:100%;box-shadow:0 4px 8px rgb(0 0 0 / .1)}h1{text-align:center;margin-bottom:1rem;color:#333}.unit-toggle{display:flex;justify-content:space-between;margin-bottom:1rem}.input-group{margin-bottom:1rem}.input-group label{display:block;margin-bottom:.5rem;color:#555}.input-group input{width:100%;padding:.5rem;border:1px solid #ccc;border-radius:4px}button{width:100%;padding:.75rem;background:#007bff;color:#fff;border:none;border-radius:4px;font-size:1rem;cursor:pointer;transition:background 0.3s ease}button:hover{background:#0056b3}#result{margin-top:1.5rem;text-align:center;font-size:1.2rem;color:#333}@media (max-width:480px){.container{margin:1rem;padding:1rem}h1{font-size:1.5rem}}