/* ===== 顶部信息栏 ===== */
    @media (min-width: 1320px) {
        #ntop {
            width: 100%;
            height: 40px;
            background: #11b97f;
            padding: 0 100px 0 100px;
        }
        .ntop {
            width: 100%;
            height: 40px;
        }
        .ntop ul {
            margin: 0;
            padding: 0;
            list-style: none;
        }
        .ntop ul li {
            float: left;
            line-height: 40px;
            color: #FFFFFF;
            margin-right: 30px;
        }
        .ntop ul li a {
            line-height: 40px;
            color: #FFFFFF;
            text-decoration: none;
        }
    }
	@media (min-width: 1200px) and (max-width: 1400px) {
        #ntop {
            width: 100%;
            height: 40px;
            background: #11b97f;
            padding: 0 100px 0 100px;
        }
        .ntop {
            width: 100%;
            height: 40px; overflow:hidden;
        }
        .ntop ul {
            margin: 0;
            padding: 0;
            list-style: none;
        }
        .ntop ul li {
            float: left;
            line-height: 40px;
            color: #FFFFFF;
            margin-right: 20px;
			font-size:14px;
        }
        .ntop ul li a {
            line-height: 40px;
            color: #FFFFFF;
            text-decoration: none;
			font-size:14px;
        }
	}
    @media (max-width: 1200px) {
        #ntop {
            display: none;
        }
    }

    /* ===== 主头部 ===== */
    .site-header {
        background-color: #ffffff;
        border-bottom: 1px solid #E4E4E4;
        padding: 18px 100px;
        /* 改为 flex row，实现 logo 左、导航右 */
        display: flex;
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        /* 相对定位，用于移动端菜单定位 */
        position: relative;
    }

    /* --- Logo --- */
    .logo {
        flex: 0 0 auto;
        /* 不伸缩，保持自身宽度 */
        display: flex;
        align-items: center;
    }
    .logo img {
        display: block;
        max-width: 520px;
        height: auto;
        max-height: 60px;
        /* 限制高度，保持与导航对齐 */
    }

    /* --- 汉堡菜单按钮（默认隐藏，移动端显示） --- */
    .hamburger-btn {
        display: none;
        /* 桌面端隐藏 */
        flex-direction: column;
        justify-content: space-between;
        width: 30px;
        height: 22px;
        background: transparent;
        border: none;
        cursor: pointer;
        padding: 0;
        z-index: 100;
        /* 在移动端保证点击区域 */;
    }
    .hamburger-btn span {
        display: block;
        height: 3px;
        width: 100%;
        background-color: #333;
        border-radius: 2px;
        transition: all 0.3s ease;
        transform-origin: center;
    }
    /* 点击后汉堡变成 "X" 的动画 */
    .hamburger-btn.active span:nth-child(1) {
        transform: translateY(9.5px) rotate(45deg);
    }
    .hamburger-btn.active span:nth-child(2) {
        opacity: 0;
    }
    .hamburger-btn.active span:nth-child(3) {
        transform: translateY(-9.5px) rotate(-45deg);
    }

    /* --- 主导航 --- */
    .main-nav {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        gap: 6px 22px;
        padding: 6px 0 2px 0;
        /* 过渡动画 */
        transition: all 0.35s ease;
    }
    .main-nav a {
        font-size: 13px;
        font-weight: 500;
        letter-spacing: 1.2px;
        text-transform: uppercase;
        text-decoration: none;
        color: #333;
        padding: 4px 2px;
        border-bottom: 2px solid transparent;
        transition: color 0.25s ease, border-color 0.25s ease;
        white-space: nowrap;
    }
    .main-nav a:hover {
        color: #000;
        border-bottom-color: #222;
    }
    .main-nav .active {
        color: #000;
        border-bottom-color: #222;
    }

    /* ===== 响应式 ===== */

    /* 平板及以下：调整内边距 */
    @media (max-width: 1024px) {
        .site-header {
            padding: 18px 60px;
        }
        .logo img {
            max-width: 100%;
            max-height: 50px;
        }
    }

    /* 手机端：显示汉堡按钮，导航隐藏/展开 */
    @media (max-width: 768px) {
        .site-header {
            padding: 14px 20px;
            flex-wrap: wrap;
            /* 允许换行，以便菜单在下方展开 */;
        }

        .logo img {
            max-width: 100%;
            max-height: 44px;
        }

        /* 显示汉堡按钮 */
        .hamburger-btn {
            display: flex;
        }

        /* 导航默认隐藏（在移动端） */
        .main-nav {
            display: none;
            /* 默认隐藏 */
            flex-direction: column;
            /* 垂直排列 */
            align-items: stretch;
            /* 宽度撑满 */
            width: 100%;
            /* 占满容器宽度 */
            padding: 16px 0 8px 0;
            gap: 6px 0;
            /* 上下间距 */
            border-top: 1px solid #eee;
            margin-top: 14px;
            /* 与logo隔开 */;
        }

        /* 导航展开状态 */
        .main-nav.open {
            display: flex;
        }

        .main-nav a {
            font-size: 14px;
            padding: 10px 4px;
            border-bottom: none;
            /* 去掉下划线，用其他方式区分 */
            text-align: center;
            width: 100%;
            white-space: normal;
            /* 允许换行 */;
        }
        .main-nav a:hover,
        .main-nav .active {
            border-bottom: none;
            background-color: #f5f5f5;
            border-radius: 4px;
        }

        /* 导航展开时，header 变为 column 布局，让菜单在下方 */
        .site-header.menu-open {
            flex-direction: column;
            align-items: stretch;
        }
        .site-header.menu-open .logo {
            align-self: flex-start;
        }
        .site-header.menu-open .hamburger-btn {
            align-self: flex-end;
            margin-top: -30px;
            /* 调整按钮位置 */;
        }
    }

    /* 小屏手机 */
    @media (max-width: 480px) {
        .site-header {
            padding: 10px 12px;
        }
        .logo img {
            max-width: 100%;
            max-height: 38px;
        }
        .main-nav a {
            font-size: 13px;
            padding: 8px 4px;
        }
    }