body {
    margin: 0;
    padding: 0;
    background: #f3f1f8;
    font-family: 'Inter', Arial, sans-serif;
}

.checkout-box {
    width: 400px;
    background: #fff;
    margin: 60px auto;
    padding: 30px;
    border-radius: 18px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
}

.checkout-box h2 {
    text-align: center;
    margin: 0 0 20px 0;
    color: #6a1bb7;
}

.plano-box {
    background: #f8efff;
    padding: 15px;
    border-radius: 12px;
    text-align: center;
    border-left: 5px solid #8a2be2;
    margin-bottom: 25px;
}

.plano-box h3 {
    margin: 0;
    font-size: 20px;
}

.plano-box .preco {
    margin-top: 8px;
    font-size: 22px;
    font-weight: bold;
}

label {
    display: block;
    margin-top: 12px;
    font-weight: bold;
}

input {
    width: 100%;
    padding: 12px;
    margin-top: 5px;
    border-radius: 10px;
    border: 1px solid #ccc;
    font-size: 15px;
    box-sizing: border-box;
}

.btn {
    width: 100%;
    margin-top: 20px;
    padding: 14px;
    background: linear-gradient(135deg, #8a2be2, #6f1bc2);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 18px;
    cursor: pointer;
    transition: 0.25s;
}

.btn:hover {
    background: linear-gradient(135deg, #7a1bd2, #5b17ad);
    transform: translateY(-3px);
}

.voltar {
    text-align: center;
    margin-top: 15px;
}

.voltar a {
    color: #6a1bb7;
    text-decoration: none;
}