body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background-color:#f0f2f5;margin:0;display:flex;flex-direction:column;min-height:100vh}.content{flex:1;display:flex;justify-content:center;align-items:center;padding:20px}.container{background-color:#fff;padding:30px;border-radius:12px;box-shadow:0 4px 20px #0000001a;width:100%;max-width:400px}h1{color:#1a1a1a;font-size:1.5rem;margin-bottom:25px;text-align:center}.form-group{margin-bottom:15px}label{display:block;margin-bottom:5px;font-weight:600;color:#444}input{width:100%;padding:10px;border:1px solid #ddd;border-radius:6px;box-sizing:border-box}button{width:100%;padding:12px;background-color:#2e7d32;color:#fff;border:none;border-radius:6px;cursor:pointer;font-size:1rem;font-weight:700;margin-top:10px;transition:background .3s}button:hover{background-color:#1b5e20}#result{text-align:center;margin-top:20px;color:#1a1a1a}.hint{font-size:.85rem;color:#666;font-style:italic;margin-top:20px;text-align:center}footer{text-align:center;padding:15px;background-color:#fff;border-top:1px solid #ddd}hr{border:0;border-top:1px solid #eee;margin-bottom:10px}#app-status{font-weight:700;color:#2e7d32}