body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #667eea, #764ba2);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}
.card {
    background: #fff;
    padding: 40px;
    border-radius: 16px;
    width: 360px;
    box-shadow: 0 20px 40px rgba(0,0,0,.2);
}
h2 {
    text-align: center;
    margin-top: 0;
}
input {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    transition: .3s;
}
input:focus {
    border-color: #764ba2;
    outline: none;
}
button {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 8px;
    background: #764ba2;
    color: #fff;
    cursor: pointer;
    font-size: 15px;
    transition: .3s;
}
button:hover {
    background: #5a3c85;
}
.erro {
    color: #e74c3c;
    margin-bottom: 15px;
    text-align: center;
}