:root {
            --primary-color: #00b894; /* Xanh lá dược phẩm */
            --secondary-color: #0984e3; /* Xanh dương y tế */
            --light-bg: #f8f9fa;
        }

        body {
            font-family: 'Inter', sans-serif;
            background-color: var(--light-bg);
        }

        /* Navbar */
        .navbar {
            background-color: white;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        .navbar-brand {
            font-weight: 700;
            color: var(--primary-color) !important;
        }

        /* Sidebar Filter */
        .filter-section {
            background: white;
            padding: 20px;
            border-radius: 12px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
        }
        .filter-title {
            font-weight: 700;
            margin-bottom: 15px;
            color: #2d3436;
        }

        /* Product Card */
        .product-card a {
            text-decoration: none;
        }
        .product-card {
            border: none;
            border-radius: 15px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            overflow: hidden;
            background: white;
            height: 100%;
        }
        .product-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .product-img-container {
            height: 200px;
            background: #eee;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }
        .badge-prescription {
            position: absolute;
            top: 10px;
            right: 10px;
            background-color: #ff7675;
            color: white;
            font-size: 10px;
            padding: 5px 10px;
            border-radius: 20px;
        }
        .product-body {
            padding: 15px;
        }
        .product-category {
            font-size: 12px;
            color: #636e72;
            text-transform: uppercase;
        }
        .product-title {
            font-weight: 600;
            font-size: 16px;
            margin: 5px 0;
            color: #2d3436;
        }
        .product-price {
            color: var(--primary-color);
            font-weight: 700;
            font-size: 18px;
        }
        .btn-add-cart {
            background-color: var(--primary-color);
            color: white;
            border-radius: 8px;
            width: 100%;
            border: none;
            padding: 8px;
            transition: 0.3s;
        }
        .btn-add-cart:hover {
            background-color: #00947a;
            color: white;
        }

        /* --- PRODUCT GALLERY (Cột Trái) --- */
.product-gallery {
    border-radius: 15px;
    overflow: hidden;
    border: 1px solid #eee;
    background: #fff;
    padding: 20px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 400px; /* Cố định chiều cao khung ảnh */
}

.main-img {
    max-height: 100%;
    max-width: 100%;
    object-fit: contain;
    transition: transform 0.3s ease;
}

.product-gallery:hover .main-img {
    transform: scale(1.05); /* Zoom nhẹ khi di chuột */
}

/* Nhãn thuốc kê đơn */
.prescription-badge {
    position: absolute;
    top: 15px;
    left: 15px;
    background-color: var(--danger-color); /* Lấy từ style.css gốc */
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    box-shadow: 0 4px 10px rgba(255, 118, 117, 0.4);
    z-index: 2;
}

/* --- PRODUCT INFO (Cột Phải) --- */
.product-name {
    font-size: 1.8rem;
    font-weight: 700;
    color: #2d3436;
    margin-bottom: 10px;
}

.price-box {
    background: #f8f9fa;
    padding: 10px 20px;
    border-radius: 10px;
    display: inline-block;
}

.current-price {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary-color);
}

.unit-text {
    font-size: 1rem;
    color: #636e72;
    margin-left: 5px;
}

.short-desc {
    color: #636e72;
    line-height: 1.6;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

/* Chính sách (Policy Box) */
.policy-box {
    display: flex;
    gap: 20px;
    border-top: 1px dashed #dfe6e9;
    border-bottom: 1px dashed #dfe6e9;
    padding: 15px 0;
}

.policy-item {
    font-size: 0.9rem;
    font-weight: 500;
    color: #2d3436;
    display: flex;
    align-items: center;
    gap: 6px;
}

/* --- BỘ ĐIỀU KHIỂN SỐ LƯỢNG --- */
.quantity-control {
    display: flex;
    align-items: center;
    border: 2px solid #dfe6e9;
    border-radius: 8px;
    overflow: hidden;
}

.quantity-control button {
    background: #f1f2f6;
    border: none;
    width: 40px;
    height: 45px;
    cursor: pointer;
    transition: 0.2s;
    font-size: 0.9rem;
}

.quantity-control button:hover {
    background: #dfe6e9;
}

.quantity-control input {
    width: 50px;
    height: 45px;
    text-align: center;
    border: none;
    font-weight: 600;
    font-size: 1.1rem;
    /* Ẩn mũi tên mặc định của input number */
    -moz-appearance: textfield;
}
.quantity-control input::-webkit-outer-spin-button,
.quantity-control input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.btn-buy {
    background-color: var(--primary-color);
    border: none;
    height: 48px;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(0, 184, 148, 0.3);
    transition: 0.3s;
}

.btn-buy:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}

/* --- TABS MÔ TẢ --- */
.nav-tabs .nav-link {
    color: #636e72;
    font-weight: 600;
    border: none;
    padding: 12px 25px;
}

.nav-tabs .nav-link.active {
    color: var(--primary-color);
    border-bottom: 3px solid var(--primary-color);
    background: transparent;
}

.tab-content h5 {
    font-weight: 700;
    color: #2d3436;
    margin-top: 20px;
    margin-bottom: 10px;
}

.tab-content p {
    color: #636e72;
    line-height: 1.7;
}

/* Responsive Mobile */
@media (max-width: 768px) {
    .policy-box {
        flex-direction: column;
        gap: 10px;
    }
    
    .product-name {
        font-size: 1.4rem;
    }
}