.checkout-header {
    background-color: #fff;
    padding: 15px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid #eee;
}
.checkout-header .back-icon { font-size: 1.5rem; margin-right: 15px; }
.checkout-content {
    flex-grow: 1;
    padding: 20px;
    background-color: #fff;
    overflow-y: auto;
}
.section-title {
    font-size: 1.1rem;
    font-weight: bold;
    margin-bottom: 15px;
    color: #333;
}
.address-box, .shipping-method-box, .payment-summary-box {
    background-color: #f8f9fa;
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 20px;
    border: 1px solid #eee;
}
.shipping-item {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
}
.shipping-item img {
    width: 50px;
    height: 50px;
    object-fit: cover;
    border-radius: 5px;
    margin-right: 10px;
}
.shipping-details { flex-grow: 1; }
.payment-options button {
    width: 100%;
    margin-bottom: 10px;
}
.pay-button-fixed {
    position: sticky;
    bottom: 0;
    background-color: #fff;
    padding: 15px 20px;
    border-top: 1px solid #eee;
    text-align: center;
    z-index: 10;
}