:root {
            --primary-purple: rgb(102, 8, 118);
            --accent-blue: rgb(5, 25, 100);
            --text-dark: #1a1a1a;
            --text-light: #555555;
            --bg-light: #f9f9fb;
            --white: #ffffff;
            --border-color: #e1e1e1;
            --container-width: 1200px;}

        * { margin: 0; padding: 0; box-sizing: border-box;}
        body {
            font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
            color: var(--text-dark);
            background-color: var(--bg-light);
            line-height: 1.6;}
        a { text-decoration: none; color: inherit; transition: all 0.3s;}
        ul { list-style: none;}
        
        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 20px;}

        /* --- MAIN LAYOUT (Sidebar + Content) --- */
        .layout-container {
            display: grid;
            grid-template-columns: 260px 1fr; /* 左侧固定宽度，右侧自适应 */
            gap: 50px;
            padding: 50px 0 80px;
            align-items: start;}

        /* --- SIDEBAR STYLE --- */
        .sidebar {
            position: sticky;
            top: 130px; /* 吸顶距离 */
            background: var(--white);
            border-radius: 8px;
            border: 1px solid var(--border-color);
            padding: 20px 0;
            box-shadow: 0 2px 8px rgba(0,0,0,0.03);}
        .sidebar-menu li {
            border-bottom: 1px solid #f0f0f0;}
        .sidebar-menu li:last-child { border-bottom: none;}
        
        .sidebar-link {
            display: flex;
            align-items: center;
            padding: 18px 25px;
            font-size: 15px;
            font-weight: 600;
            color: var(--text-light);
            cursor: pointer;
            transition: all 0.2s;
            border-left: 4px solid transparent;}
        
        .sidebar-link:hover {
            background-color: #f9f9fb;
            color: var(--primary-purple);}
        
        .sidebar-link.active {
            background-color: rgb(248, 240, 250); /* 浅紫底色 */
            color: var(--primary-purple);
            border-left-color: var(--primary-purple);}
        .sidebar-link i { margin-right: 12px; width: 20px; text-align: center;}


        /* --- CONTENT AREA STYLES --- */
        .content-section {
            background: var(--white);
            padding: 40px;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.02);
            border: 1px solid var(--border-color);
            display: none; /* 默认隐藏 */
            animation: fadeIn 0.5s ease;}
        .content-section.active { display: block;}
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px);}
            to { opacity: 1; transform: translateY(0);}
        }

        .section-title {
            font-size: 28px;
            color: var(--accent-blue);
            margin-bottom: 30px;
            padding-bottom: 15px;
            border-bottom: 1px solid #eee;
            font-weight: 700;}

/* --- 1. WELCOME SECTION (Grid 强力修复版) --- */
        .chair-msg-wrapper {
            display: grid; 
            /* 关键：左列固定240px，右列占据剩余空间(1fr) */
            grid-template-columns: 240px 1fr; 
            gap: 40px; /* 两列之间的硬性间距 */
            align-items: start;}

        .chair-photo {
            width: 100%;}

        .chair-photo img {
            width: 100%; /* 强制图片宽度适应容器，绝不会溢出 */
            height: auto;
            border-radius: 4px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            display: block;}

        .chair-name {
            margin-top: 15px;
            font-size: 18px;
            font-weight: 800;
            color: var(--text-dark);
            line-height: 1.3;}

        .chair-title {
            font-size: 13px;
            color: #888;
            font-weight: 700;
            text-transform: uppercase;
            margin-top: 5px;}

        /* 文本区域样式 */
        .chair-text {
            /* 移除所有宽度限制，grid会自动处理 */
            min-width: 0;}

        .chair-text .quote {
            font-size: 18px;
            line-height: 1.6;
            font-style: italic;
            color: var(--primary-purple);
            border-left: 4px solid var(--primary-purple);
            padding-left: 20px;
            margin-bottom: 25px;
            margin-top: 0;}

        .chair-text p {
            margin-bottom: 15px;
            text-align: justify;}

        .signature {
            margin-top: 30px;
            font-family: "HanziPen SC", "Kaiti SC", "KaiTi", "DFKai-SB", "KaiTi TC", serif;
            font-size: 26px;
            font-weight: 700;
            letter-spacing: 1px;
            color: #333;}

        /* 手机端适配：改为单列 */
        @media (max-width: 768px) {
            .chair-msg-wrapper {
                grid-template-columns: 1fr; /* 变成一列 */
                gap: 20px;}
            .chair-photo {
                max-width: 300px; /* 手机上限制图片最大宽度 */
                margin: 0 auto;}
            .chair-text .quote {
                font-size: 16px;}
        }

        /* 2. INTRODUCTION SECTION */
        .intro-stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin: 30px 0;}
        .stat-card { background: var(--bg-light); padding: 20px; text-align: center; border-radius: 6px;}
        .stat-num { font-size: 32px; color: var(--primary-purple); font-weight: 800;}
        .stat-label { font-size: 13px; color: #666; font-weight: 600; text-transform: uppercase;}
        .intro-img-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 30px;}
        .intro-img-grid img { width: 100%; height: 200px; object-fit: cover; border-radius: 6px;}

        /* 3. HISTORY SECTION (Timeline) */
        .timeline { position: relative; padding-left: 30px; border-left: 3px solid #e1e1e1; margin-left: 10px;}
        .timeline-item { position: relative; margin-bottom: 50px;}
        .timeline-item:last-child { margin-bottom: 0;}
        .timeline-dot { 
            position: absolute; left: -40px; top: 0; width: 20px; height: 20px; 
            background: var(--white); border: 4px solid var(--primary-purple); border-radius: 50%;}
        .timeline-year { font-size: 14px; font-weight: 800; color: var(--primary-purple); margin-bottom: 5px; letter-spacing: 1px;}
        .timeline-title { font-size: 20px; font-weight: 700; color: var(--text-dark); margin-bottom: 10px;}
        .timeline-desc { font-size: 15px; color: var(--text-light);}

        /* 4. ADMINISTRATION (Committees) */
        .admin-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 25px;}
        .comm-card { 
            background: var(--white); border: 1px solid #eee; padding: 25px; 
            border-radius: 8px; transition: all 0.3s; position: relative; overflow: hidden;}
        .comm-card:hover { border-color: var(--primary-purple); box-shadow: 0 5px 15px rgba(0,0,0,0.05);}
        .comm-icon { font-size: 24px; color: rgba(102, 8, 118, 0.15); position: absolute; top: 20px; right: 20px;}
        .comm-name { font-size: 16px; font-weight: 700; color: var(--accent-blue); margin-bottom: 8px; padding-right: 30px;}
        .comm-detail { font-size: 13px; color: #666; margin-bottom: 5px;}
        .comm-chair { font-weight: 600; color: var(--primary-purple);}

        /* 5. CONTACT US */
        .contact-wrapper { display: grid; grid-template-columns: 1fr 1fr; gap: 30px;}
        .contact-info { padding-right: 20px;}
        .info-item { display: flex; margin-bottom: 25px;}
        .info-icon { 
            width: 40px; height: 40px; background: rgba(5, 25, 100, 0.1); color: var(--accent-blue);
            border-radius: 50%; display: flex; align-items: center; justify-content: center; margin-right: 15px; flex-shrink: 0;}
        .info-content h5 { font-size: 16px; font-weight: 700; margin-bottom: 5px;}
        .info-content p { font-size: 14px; color: #666; margin: 0;}
        .map-frame { 
            width: 100%; 
            height: auto; 
            background: #eee; 
            border-radius: 8px; 
            overflow: hidden; 
            border: 1px solid #e1e1e1;
            display: block;}

        @media (max-width: 768px) {
            .layout-container { grid-template-columns: 1fr;}
            .sidebar { position: static; margin-bottom: 30px;}
            .chair-msg-wrapper { flex-direction: column;}
            .chair-photo { width: 100%;}
            .intro-stats-grid { grid-template-columns: 1fr;}
            .admin-grid, .contact-wrapper, .intro-img-grid { grid-template-columns: 1fr;}
        }