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

        body {
            background-color: #f0f2f5;
            padding: 20px;
        }

        /* 2. Container chính */
        #container {
            width: 1100px;
            margin: auto;
            display: flex; /* Chia cột Menu và Nội dung chính */
            background-color: white;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            border-radius: 12px;
            overflow: hidden; /* Cắt các góc thừa */
            min-height: 900px;
        }

        /* 3. Menu bên trái (Sidebar) */
        #menu {
            width: 240px;
            background-color: #2c3e50;
            color: white;
            padding: 30px 0;
        }

        #menu h2 {
            font-size: 20px;
            text-align: center;
            margin-bottom: 25px;
            color: #ffeb3b;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        #menu ul {
            list-style: none;
        }

        #menu ul li a {
            display: block;
            padding: 15px 25px;
            color: #ecf0f1;
            text-decoration: none;
            border-bottom: 1px solid #34495e;
            transition: all 0.3s ease;
        }

        #menu ul li a:hover {
            background-color: #34495e;
            color: #ffeb3b;
            padding-left: 35px; /* Hiệu ứng đẩy chữ */
        }

        /* 4. Phần bên phải (Main Content) */
        #main-section {
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        /* Banner (Header) */
        #header {
            width: 100%;
            height: 200px;
            /* Đường dẫn ảnh banner của bạn */
            background-image: linear-gradient(rgba(0,0,0,0.2), rgba(0,0,0,0.2)), url('./background(03)/Banner.jpg');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 32px;
            font-weight: bold;
            text-shadow: 2px 2px 10px rgba(0,0,0,0.5);
            text-transform: uppercase;
        }

        /* 5. Khu vực sản phẩm (Dùng Grid) */
        #content {
            padding: 25px;
            display: grid;
            grid-template-columns: repeat(3, 1fr); /* Chia 3 cột đều nhau */
            gap: 20px;
            background-color: #fff;
        }

        .product {
            border: 1px solid #f0f0f0;
            border-radius: 10px;
            padding: 15px;
            text-align: center;
            transition: all 0.4s ease;
            position: relative;
        }

        .product:hover {
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
            transform: translateY(-8px);
            border-color: #ffeb3b;
        }

        .product img {
            width: 100%;
            height: 220px;
            object-fit: cover; /* Giúp ảnh không bị méo */
            border-radius: 8px;
            margin-bottom: 15px;
        }

        .product h3 {
            font-size: 17px;
            color: #333;
            margin-bottom: 10px;
        }

        .product p {
            color: #e91e63;
            font-weight: bold;
            font-size: 18px;
            margin-bottom: 15px;
        }

        /* Nút mua hàng */
        .btn-buy {
            background-color: #e91e63;
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 20px;
            cursor: pointer;
            font-weight: bold;
            transition: 0.3s;
        }

        .btn-buy:hover {
            background-color: #c2185b;
            transform: scale(1.05);
        }