/* 核心色值：绿色#2E7D32 橙色#FF7D00 深灰#333 */
    :root {
        --main-color: #2E7D32;
        --accent-color: #FF7D00;
        --dark-color: #212121;
        --light-bg: #f8f9fa;
    }

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

    body {
        color: var(--dark-color);
        line-height: 1.6;
        padding-top: 150px;
    }

    /* 导航栏样式 */
    .navbar {
        background: white;
        border-bottom: 3px solid var(--main-color);
        padding: 15px 0;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    }
    .navbar-brand img {
        height: 130px;
    }
    .nav-link {
        color: var(--dark-color) !important;
        font-weight: 500;
        margin: 0 8px;
        transition: 0.3s;
    }
    .nav-link:hover {
        color: var(--main-color) !important;
    }
    .lang-btn {
        border: 1px solid var(--main-color);
        color: var(--main-color);
        padding: 5px 12px;
        border-radius: 4px;
    }

    /* 下拉菜单样式 */
    .dropdown-menu {
        border: none;
        border-top: 3px solid var(--main-color);
        border-radius: 0 0 8px 8px;
        box-shadow: 0 6px 16px rgba(0,0,0,0.1);
        padding: 8px 0;
        margin-top: 2px;
        background: white;
    }
    .dropdown-item {
        color: var(--dark-color);
        font-weight: 500;
        padding: 8px 24px;
        transition: 0.2s;
        font-size: 0.95rem;
    }
    .dropdown-item:hover, .dropdown-item:focus {
        background-color: #f0f7e8;
        color: var(--main-color);
    }
    .dropdown-toggle::after {
        vertical-align: middle;
        color: var(--dark-color);
    }

    /* ========= 新断点：屏幕宽度 < 1130px 时启用汉堡菜单 ========= */
    /* 移动端 (小于1130px) 样式 */
    @media (max-width: 1129.98px) {
        body {
            padding-top: 170px;
        }
        /* 覆盖 navbar-expand-lg 使其表现为折叠状态 */
        .navbar-expand-lg .navbar-collapse {
            display: none !important;
            flex-basis: 100%;
        }
        .navbar-expand-lg .navbar-collapse.collapse.show {
            display: flex !important;
        }
        .navbar-expand-lg .navbar-nav {
            flex-direction: column;
        }
        .navbar-expand-lg .navbar-toggler {
            display: inline-block;
        }
        /* 调整汉堡按钮位置（保持原有右上角） */
        .navbar .container-fluid {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .navbar-toggler {
            margin-left: auto;
            position: absolute;
            top: 10px;
            right: 10px;
        }
        /* 折叠菜单内的下拉菜单样式 */
        .dropdown-menu {
            border: none;
            background: #fafafa;
            box-shadow: none;
            margin-top: 0;
            padding-left: 20px;
        }
        .dropdown-item {
            padding: 8px 20px;
        }
        .dropdown-toggle::after {
            float: right;
            margin-top: 8px;
        }
        /* 移动端 Banner 自适应 */
        .hero-banner {
            height: auto;
            min-height: 70vh;
            padding: 40px 0;
        }
    }

    /* 桌面端 (≥1130px) 样式：恢复水平导航、悬停下拉菜单、紧凑布局 */
    @media (min-width: 1130px) {
        /* 恢复导航栏水平布局 */
        .navbar-expand-lg .navbar-collapse {
            display: flex !important;
            flex-basis: auto;
        }
        .navbar-expand-lg .navbar-toggler {
            display: none;
        }
        .navbar-expand-lg .navbar-nav {
            flex-direction: row;
        }
        /* 鼠标悬停显示下拉菜单（桌面端） */
        .dropdown:hover .dropdown-menu {
            display: block;
        }
        .dropdown .dropdown-menu {
            display: none;
        }
        .dropdown:hover .dropdown-toggle::after {
            transform: rotate(180deg);
            transition: transform 0.2s;
        }
        /* 强制菜单项单行显示，紧凑间距 */

        .navbar .container-fluid {
            padding-left: 0 !important;
            padding-right: 0 !important;
        }
        .navbar-brand {
            margin-left: 0 !important;
            padding-left: 15px;
        }
        .navbar-nav {
            flex-wrap: nowrap !important;
        }
        .nav-link {
            padding-left: 0.8rem !important;
            padding-right: 0.8rem !important;
            font-size: 0.95rem;
            white-space: nowrap;
        }
        /* 针对窄桌面 (1130px ~ 1599px) 进一步紧凑 */
        @media (max-width: 1599px) {
            .nav-link {
                font-size: 0.8rem;
                padding-left: 0.1rem !important;
                padding-right: 0.1rem !important;
                margin: 0 6px;
            }
            .nav-item:last-child .nav-link,
            .nav-item:nth-last-child(2) .nav-link {
                padding-left: 0.3rem !important;
                padding-right: 0.3rem !important;
                font-size: 0.85rem;
            }
            .lang-btn {
                padding: 5px 8px;
                margin-left: 2px;
            }
            .dropdown-item {
                padding: 6px 18px;
                font-size: 0.85rem;
            }
        }
        /* 极窄桌面 (1130px~1199px) 缩小 logo 和间距 */
        @media (max-width: 1199px) {
            .nav-link {
                font-size: 0.8rem;
                padding-left: 0.1rem !important;
                padding-right: 0.1rem !important;
                margin: 0 3px;
            }
            .nav-item:last-child .nav-link,
            .nav-item:nth-last-child(2) .nav-link {
                padding-left: 0.1rem !important;
                padding-right: 0.1rem !important;
                font-size: 0.8rem;
            }
            .lang-btn {
                padding: 5px 8px;
                margin-left: 1px;
            }
            .dropdown-item {
                padding: 6px 18px;
                font-size: 0.8rem;
            }
        }
    }

        /* 页面头部样式 - 添加背景图，与首页Banner一致 */
        .page-header {
            background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.6)), url('../images/1_2.jpg');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 100px 0 80px;
            text-align: center;
            margin-bottom: 60px;
        }
        .page-header h1 {
            font-size: 48px;
            font-weight: 700;
            margin-bottom: 20px;
            text-shadow: 0 2px 10px rgba(0,0,0,0.5);
        }
        .page-header p {
            font-size: 18px;
            opacity: 0.9;
            max-width: 700px;
            margin: 0 auto;
            text-shadow: 0 1px 5px rgba(0,0,0,0.3);
        }

        .section-title {
            text-align: center;
            color: var(--main-color);
            font-weight: 700;
            margin-bottom: 40px;
            position: relative;

            font-size: 32px;
        }
        .section-title::after {
            content: '';
            width: 80px;
            height: 3px;
            background: var(--accent-color);
            position: absolute;
            bottom: -12px;
            left: 50%;
            transform: translateX(-50%);
        }

        .content-card {
            background: white;
            border-radius: 10px;
            padding: 30px;
            margin-bottom: 30px;
            box-shadow: 0 3px 15px rgba(0,0,0,0.05);
            transition: transform 0.3s ease;
            height: 100%;
            border-left: 4px solid var(--main-color);
        }
        .content-card:hover {
            transform: translateY(-5px);
        }
        .content-card h3 {
            color: var(--main-color);
            font-size: 24px;
            margin-bottom: 20px;
            font-weight: 600;
        }
        .content-card i {
            color: var(--accent-color);
            font-size: 28px;
            margin-right: 12px;
        }

        .committee-member {
            text-align: center;
            padding: 20px;
            background: white;
            border-radius: 10px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.05);
            margin-bottom: 30px;
            transition: 0.3s;
        }
        .committee-member:hover {
            transform: translateY(-5px);
        }
        .committee-member i {
            font-size: 48px;
            color: var(--main-color);
            margin-bottom: 15px;
        }
        .committee-member h5 {
            font-weight: 600;
            margin-bottom: 5px;
        }
        .committee-member p {
            color: #666;
            font-size: 14px;
        }

        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline-item {
            position: relative;
            padding-bottom: 30px;
            border-left: 2px solid var(--main-color);
            padding-left: 25px;
            margin-left: 10px;
        }
        .timeline-item:last-child {
            border-left: none;
        }
        .timeline-year {
            font-weight: 700;
            color: var(--main-color);
            font-size: 20px;
            margin-bottom: 8px;
        }
        .timeline-content {
            background: #f9f9f9;
            padding: 12px 18px;
            border-radius: 8px;
        }

        /* 回到顶部按钮 */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--main-color);
            color: white;
            border-radius: 50%;
            text-align: center;
            line-height: 50px;
            font-size: 24px;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 999;
            box-shadow: 0 2px 10px rgba(0,0,0,0.2);
        }
        .back-to-top:hover {
            background: var(--accent-color);
            transform: translateY(-3px);
        }
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }
        @media (max-width: 768px) {
            .back-to-top {
                width: 40px;
                height: 40px;
                line-height: 40px;
                font-size: 20px;
                bottom: 20px;
                right: 20px;
            }
        }

        /* 页脚 */
        footer {
            background: var(--main-color);
            color: white;
            padding: 50px 0 20px;
            margin-top: 60px;
        }
        .footer-title {
            font-size: 20px;
            margin-bottom: 20px;
            font-weight: 600;
        }
        .footer-link {
            color: rgba(255,255,255,0.8);
            display: block;
            margin-bottom: 10px;
            transition: 0.3s;
        }
        .footer-link:hover {
            color: white;
            text-decoration: none;
        }
        .copyright {
            text-align: center;
            margin-top: 30px;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.2);
            color: rgba(255,255,255,0.8);
        }

        /* 响应式通用调整 */
        @media (max-width: 768px) {
            .page-header h1 {
                font-size: 32px;
            }
            .section-title {
                font-size: 28px;
            }
            .content-card h3 {
                font-size: 20px;
            }
        }
		/* 让“About IFM2027”的文字链接与下拉箭头紧凑 */
.nav-item.dropdown.d-flex .nav-link:first-child {
    padding-right: 0 !important;
}
.nav-item.dropdown.d-flex .dropdown-toggle {
    padding-left: 0 !important;
    margin-left: -0.2rem !important;
}