* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

/* Header */
header {
    background: #c7d20a;
    text-align: center;
    padding: 20px;
    color: white;
}

/* Menu */
nav {
    background: #f4a582;
    text-align: center;
    padding: 10px;
}

nav a {
    margin: 0 15px;
    color: #333;
    font-weight: bold;
    text-decoration: none;
}

nav a:hover{
    color: black;
}

.product-detail {
    max-width: 900px;
    margin: 40px auto;
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
    text-align: center;
}

/* Bố cục trái - phải */
.product-layout {
    display: flex;
    gap: 30px;
    align-items: center;
}

/* Ảnh bên trái */
.product-layout img {
    width: 50%;
    max-height: 400px;
    object-fit: cover;
    border-radius: 10px;
}

/* Thông tin bên phải */
.product-info {
    width: 50%;
}

.product-info h2 {
    margin-bottom: 10px;
}

.product-info p {
    margin: 10px 0;
    color: #555;
}

.product-info h3 {
    margin: 15px 0;
    color: #e74c3c;
}

/* Nút quay lại */
.back-btn, .add-btn{
    display: inline-block;
    margin-top: 20px;
    padding: 10px 18px;
    background: #1fa36b;
    color: white;
    text-decoration: none;
    border-radius: 6px;
}

.back-btn:hover {
    background: #168a59;
}

@media (max-width: 768px) {

    .product-detail {
        margin: 20px;
        padding: 20px;
    }

    .product-detail img {
        width: 100%;
    }

    .product-buttons {
        flex-direction: column;
        gap: 10px;
    }
}