body {
            font-family: 'Roboto', sans-serif;
            background: linear-gradient(90deg, #1e88e5, #43a047);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .card {
            border: none;
            border-radius: 16px;
            box-shadow: 0 8px 20px rgba(0,0,0,0.1);
        }
        .icon {
            width: 64px;
            margin-bottom: 20px;
        }

           button {
            background: linear-gradient(90deg, #0074d9 60%, #2ecc40 100%);
            color: #fff;
            border: none;
            border-radius: 6px;
            padding: 10px 0;
            width: 100%;
            font-size: 1.1rem;
            font-weight: 700;
            cursor: pointer;
            transition: background 0.2s;
        }
        button:hover {
            background: linear-gradient(90deg, #005fa3 60%, #27ae60 100%);
        }
        .btn-voltar {
            background: linear-gradient(90deg, #e65100 60%, #bf360c 100%);
            border: none;
        }
        .btn-voltar:hover {
            background: linear-gradient(90deg, #27ae60 60%, #005fa3 100%);
        }