/* Advanced & Modern Checkout Page Styling */
.checkout-container {
    max-width: 600px;
    margin: 60px auto;
    padding: 40px;
    background: linear-gradient(135deg, #1e1e2f, #28293e);
    border-radius: 20px;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
    font-family: 'Poppins', sans-serif;
    color: #fff;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.checkout-container::before {
    content: '';
    position: absolute;
    top: -50px;
    left: -50px;
    width: 150px;
    height: 150px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    filter: blur(50px);
}

.checkout-heading {
    font-size: 32px;
    font-weight: bold;
    color: #ffcc00;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 25px;
}

.checkout-detail {
    font-size: 18px;
    color: #ddd;
    background: rgba(255, 255, 255, 0.1);
    padding: 12px;
    border-radius: 10px;
    margin: 10px 0;
    display: inline-block;
    width: 100%;
    text-align: left;
}

.checkout-label {
    font-size: 18px;
    font-weight: bold;
    color: #ffcc00;
    margin-top: 20px;
    display: block;
}

.checkout-select {
    width: 100%;
    padding: 14px;
    border-radius: 12px;
    border: none;
    font-size: 18px;
    background: #3b3c50;
    color: #ffcc00;
    transition: all 0.4s ease;
}

.checkout-select:hover,
.checkout-select:focus {
    outline: none;
    background: #ffcc00;
    color: #1e1e2f;
}

.checkout-form {
    margin-top: 30px;
}

.checkout-button {
    width: 100%;
    padding: 16px;
    font-size: 22px;
    font-weight: bold;
    color: #1e1e2f;
    background: #ffcc00;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.4s ease;
    box-shadow: 0 8px 20px rgba(255, 204, 0, 0.4);
}

.checkout-button:hover {
    background: #ff9900;
    box-shadow: 0 10px 25px rgba(255, 153, 0, 0.5);
    transform: translateY(-3px);
}

@media screen and (max-width: 600px) {
    .checkout-container {
        width: 90%;
        padding: 30px;
    }
    .checkout-heading {
        font-size: 26px;
    }
    .checkout-detail {
        font-size: 16px;
    }
    .checkout-button {
        font-size: 20px;
        padding: 14px;
    }
}