body { font-family: sans-serif; background-color: #f9f9f9; }
.detail-box {
    background: white;
    width: 80%;
    margin: 50px auto;
    padding: 20px;
    display: flex; 
    gap: 30px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.left-col img {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: 5px;
}

.right-col {
    flex: 1;
}

.price {
    color: red;
    font-size: 24px;
    font-weight: bold;
}

.btn-action {
    padding: 10px 20px;
    text-decoration: none;
    color: white;
    border-radius: 4px;
    display: inline-block;
    margin-top: 10px;
}

.btn-checkout { background-color: #28a745; }
.btn-back { background-color: #6c757d; }