/* 页眉样式 - 固定白色背景，无透明和滚动效果 */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            padding: 15px 50px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            z-index: 1000;
            background: #ffffff; /* 固定白色背景 */
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1); /* 固定阴影效果 */
        }
        
        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: #2c3e50;
            text-decoration: none;
        }
        
        .logo span {
            color: #3498db;
        }
        
        nav ul {
            display: flex;
            list-style: none;
            align-items: center;
        }
        
        nav ul li {
            margin-left: 30px;
        }
        
        nav ul li a {
            text-decoration: none;
            color: #2c3e50; /* 固定黑色文字 */
            font-weight: 500;
            font-size: 1.1rem;
            padding: 8px 0;
            position: relative;
            transition: 0.3s;
        }
        
        nav ul li a:hover {
            color: #3498db;
        }
        
        nav ul li a::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: #3498db;
            bottom: 0;
            left: 0;
            transition: 0.3s;
        }
        
        nav ul li a:hover::after {
            width: 100%;
        }
        
        /* 购物车图标样式 */
        .cart-icon {
            position: relative;
            display: flex;
            align-items: center;
        }
        
        .cart-icon a {
            display: flex;
            align-items: center;
            text-decoration: none;
            color: #2c3e50;
            font-weight: 500;
            font-size: 1.1rem;
            padding: 8px 0;
            transition: 0.3s;
        }
        
        .cart-icon a:hover {
            color: #3498db;
        }
        
        .cart-count {
            position: absolute;
            top: -8px;
            right: -8px;
            background: #e74c3c;
            color: white;
            border-radius: 50%;
            width: 20px;
            height: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            font-weight: 600;
        }
        
        /* 移动端菜单样式 */
        .menu-toggle {
            display: none;
            cursor: pointer;
            font-size: 2rem;
            color: #2c3e50; /* 固定黑色 */
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            header {
                padding: 15px 30px;
                background: #ffffff; /* 移动端也保持白色背景 */
            }
            
            .menu-toggle {
                display: block;
                color: #2c3e50; /* 移动端菜单图标为黑色 */
            }
            
            .logo {
                font-size: 1.2rem;
                font-weight: 700;
                color: #2c3e50;
                text-decoration: none;
            }
            
            nav {
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: #ffffff; /* 移动端导航背景为白色 */
                box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
                padding: 0;
                max-height: 0;
                overflow: hidden;
                transition: 0.5s;
            }
            
            nav.active {
                max-height: 300px;
                padding: 20px 0;
            }
            
            nav ul {
                flex-direction: column;
                align-items: center;
            }
            
            nav ul li {
                margin: 10px 0;
            }
            
            nav ul li a {
                color: #2c3e50; /* 移动端导航文字为黑色 */
                font-size: 1.1rem;
                padding: 8px 20px;
            }
            
            .cart-icon {
                margin: 10px 0;
            }
        }
        
        /* 内容区域样式 */
        .content {
            max-width: 1200px;
            margin: 100px auto;
            padding: 0 20px;
        }
        
        .section {
            margin-bottom: 80px;
        }
        
        .section h2 {
            font-size: 2.5rem;
            margin-bottom: 30px;
            color: #2c3e50;
            text-align: center;
        }
        
        .section p {
            font-size: 1.1rem;
            line-height: 1.8;
            color: #34495e;
            margin-bottom: 20px;
        }

    /* WhatsApp Floating Button Styles */
    .whatsapp-float {
        position: fixed;
        width: 60px;
        height: 60px;
        bottom: 40px;
        right: 40px;
        background-color: #25D366;
        color: #FFF;
        border-radius: 50px;
        text-align: center;
        font-size: 30px;
        box-shadow: 2px 2px 3px #999;
        z-index: 100;
        transition: all 0.3s ease;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .whatsapp-float:hover {
        background-color: #128C7E;
        transform: scale(1.1);
        box-shadow: 2px 2px 10px #666;
    }
    
    .whatsapp-float i {
        margin-top: 5px;
    }
    
    /* Tooltip text */
    .whatsapp-float .tooltip-text {
        visibility: hidden;
        width: 120px;
        background-color: #555;
        color: #fff;
        text-align: center;
        border-radius: 6px;
        padding: 5px;
        position: absolute;
        z-index: 1;
        bottom: 125%;
        left: 50%;
        margin-left: -60px;
        opacity: 0;
        transition: opacity 0.3s;
        font-size: 14px;
    }
    
    .whatsapp-float:hover .tooltip-text {
        visibility: visible;
        opacity: 1;
    }
    
    /* 购物车浮动按钮样式 */
    .cart-float {
        position: fixed;
        width: 60px;
        height: 60px;
        bottom: 110px;
        right: 40px;
        background-color: #ff9f43;
        color: #FFF;
        border-radius: 50px;
        text-align: center;
        font-size: 30px;
        box-shadow: 2px 2px 3px #999;
        z-index: 100;
        transition: all 0.3s ease;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .cart-float:hover {
        background-color: #ff8300;
        transform: scale(1.1);
        box-shadow: 2px 2px 10px #666;
    }
    
    .cart-float .tooltip-text {
        visibility: hidden;
        width: 120px;
        background-color: #555;
        color: #fff;
        text-align: center;
        border-radius: 6px;
        padding: 5px;
        position: absolute;
        z-index: 1;
        bottom: 125%;
        left: 50%;
        margin-left: -60px;
        opacity: 0;
        transition: opacity 0.3s;
        font-size: 14px;
    }
    
    .cart-float:hover .tooltip-text {
        visibility: visible;
        opacity: 1;
    }
    
    /* 移动端响应式调整 */
    @media (max-width: 768px) {
        .whatsapp-float {
            width: 50px;
            height: 50px;
            bottom: 20px;
            right: 20px;
            font-size: 25px;
        }
        
        .cart-float {
            width: 50px;
            height: 50px;
            bottom: 90px;
            right: 20px;
            font-size: 25px;
        }
    }