/* 通用样式和重置 */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
}

.container {
    width: 90%; 
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 0;
}

/* 1. 导航栏样式 */
.main-header {
    background-color: #ffffff;
    padding: 15px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    position: relative; /* 用于移动端导航定位 */
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

.company-logo {
    height: 30px; /* Logo 图片高度 */
    width: auto;
    display: block;
}

.logo {
    font-size: 1.5em;
    font-weight: bold;
    color: #0056b3;
}

/* 默认隐藏汉堡包按钮 */
.mobile-menu-toggle {
    display: none; 
    font-size: 1.8em;
    background: none;
    border: none;
    cursor: pointer;
    color: #333;
    padding: 0;
}

.main-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
}

.main-nav ul li a {
    text-decoration: none;
    color: #333;
    padding: 10px 15px;
    display: block;
}

/* 2. 英雄区/幻灯片样式 (Adaptive Height & Carousel) */
/* (Styles for hero-slider, slide-item, dot remain the same as previous) */
.hero-slider {
    position: relative; 
    background-color: #f0f0f0;
    overflow: hidden; 
    width: 100%;
}

.slides-container {
    position: relative;
}

.hero-slider img {
    width: 100%;
    height: auto; 
    display: block;
    object-fit: cover;
}

.slide-item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    opacity: 0; 
    transition: opacity 1s ease-in-out; 
}

.slide-item.active {
    position: relative; 
    opacity: 1;
}

.slider-dots {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    text-align: center;
}

.dot {
    height: 10px;
    width: 10px;
    margin: 0 5px;
    background-color: #bbb;
    border-radius: 50%;
    display: inline-block;
    cursor: pointer;
    transition: background-color 0.6s ease;
}

.dot.active, .dot:hover {
    background-color: #717171;
}

/* 3. 中间 左图右文布局 (Styles remain the same) */
.content-section {
    padding: 50px 0;
    text-align: center;
}

.white-bg-pad {
    background-color: #ffffff;
}

.layout-image-text {
    display: flex;
    align-items: center;
    gap: 40px;
    text-align: left;
}

.layout-image-text .image-box {
    flex: 1;
}

.layout-image-text .image-box img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: 5px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.layout-image-text .text-box {
    flex: 1;
}

.btn-more {
    display: inline-block;
    background-color: #007bff;
    color: white;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 15px;
}


/* 4. 产品网格布局 (Styles remain the same) */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); 
    gap: 30px;
    margin-top: 30px;
}

.product-item {
    background-color: #ffffff;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.product-item a {
    text-decoration: none;
    color: inherit;
}

.product-item img {
    width: 100%;
    height: 200px;
    object-fit: contain;
    margin-bottom: 15px;
}

.product-item h3 {
    margin: 10px 0;
    color: #0056b3;
}

/* 5. 页脚样式 (Styles remain the same) */
.main-footer {
    background-color: #333;
    color: white;
    padding: 40px 0 20px 0;
}

.footer-content {
    display: flex;
    justify-content: space-around;
    padding-bottom: 20px;
    border-bottom: 1px solid #555;
}

.footer-col h3 {
    border-bottom: 2px solid #fff;
    padding-bottom: 5px;
    margin-bottom: 15px;
}

.footer-col ul {
    list-style: none;
    padding: 0;
}

.footer-col ul li a {
    color: #ccc;
    text-decoration: none;
    display: block;
    padding: 5px 0;
}

.copyright {
    text-align: center;
    margin-top: 20px;
    color: #ccc;
}

/* ======================================================= */
/* 移动端响应式设计 (Media Queries) */
/* ======================================================= */

/* 当屏幕宽度小于 768px 时 (平板和手机) */
@media (max-width: 768px) {
    
    /* 导航栏：实现折叠菜单 */
    .main-header {
        padding: 15px 5%;
        /* 确保 logo 和 toggle button 左右对齐 */
        justify-content: space-between; 
    }
    
    /* 显示汉堡包按钮 */
    .mobile-menu-toggle {
        display: block;
        z-index: 100;
    }
    
    /* 隐藏默认导航，并将其定位到右上角 */
    .main-nav {
        display: none;
        position: absolute;
        top: 100%; /* 位于 header 下方 */
        right: 0;
        width: 200px; /* 菜单宽度 */
        background-color: #ffffff;
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        z-index: 50;
        border-radius: 0 0 5px 5px;
    }

    /* 激活状态下显示导航 */
    .main-nav.active {
        display: block;
    }
    
    .main-nav ul {
        flex-direction: column; /* 菜单项垂直排列 */
        padding: 10px 0;
    }

    .main-nav ul li a {
        padding: 10px 20px;
        border-bottom: 1px solid #eee;
        color: #333;
    }
    
    .main-nav ul li:last-child a {
        border-bottom: none;
    }
    
    /* 中间部分：左图右文布局变为垂直堆叠 */
    .layout-image-text {
        flex-direction: column;
        gap: 20px;
    }

    .layout-image-text .text-box, 
    .layout-image-text .image-box {
        flex: none; 
        width: 100%;
    }
    
    .layout-image-text .text-box {
        order: 1; 
    }
    
    .layout-image-text .image-box {
        order: 2;
    }

    /* 页脚：堆叠列 */
    .footer-content {
        flex-direction: column;
        gap: 30px;
        align-items: center;
    }

    .footer-col {
        width: 90%;
        text-align: center;
    }
}

/* 当屏幕宽度小于 480px 时 (小手机) */
@media (max-width: 480px) {
    .container {
        width: 95%; 
    }
    
    .product-grid {
        grid-template-columns: 1fr;
    }

    .content-section {
        padding: 30px 0;
    }
}