/* 关于协会页面头部 */
        .about-header {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            color: white;
            padding: 60px 0;
            text-align: center;
            margin-bottom: 40px;
        }
        
        .about-header h1 {
            font-size: 2.8rem;
            margin-bottom: 20px;
        }
        
        .about-header p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto;
            opacity: 0.9;
        }
        
        /* 关于协会导航 */
        .about-nav {
            background-color: white;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
            margin-bottom: 40px;
            position: sticky;
            top: 70px;
            z-index: 99;
        }
        
        .about-nav-container {
            display: flex;
            justify-content: center;
            overflow-x: auto;
        }
        
        .about-nav-tabs {
            display: flex;
            list-style: none;
            flex-wrap: nowrap;
        }
        
        .about-nav-tabs li {
            margin: 0;
        }
        
        .about-nav-tabs a {
            display: block;
            padding: 15px 25px;
            text-decoration: none;
            color: var(--dark);
            font-weight: 600;
            transition: all 0.3s;
            border-bottom: 3px solid transparent;
            white-space: nowrap;
        }
        
        .about-nav-tabs a:hover, .about-nav-tabs a.active {
            color: var(--primary);
            border-bottom: 3px solid var(--accent);
            background-color: var(--light-blue);
        }
        
        /* 主要内容区 */
        .about-content {
            margin: 40px 0;
        }
        
        .about-tab {
            display: none;
        }
        
        .about-tab.active {
            display: block;
        }
        
        .tab-header {
            margin-bottom: 30px;
            text-align: center;
        }
        
        .tab-header h2 {
            font-size: 2.2rem;
            color: var(--primary);
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }
        
        .tab-header h2::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background-color: var(--accent);
        }
        
        .tab-header p {
            color: var(--gray);
            max-width: 800px;
            margin: 20px auto 0;
        }
        
        /* 协会简介 */
        .intro-content {
            background-color: white;
            border-radius: 10px;
            padding: 40px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
            margin-bottom: 40px;
        }
        
        .intro-text {
            font-size: 1.1rem;
            line-height: 1.8;
            color: var(--dark);
            margin-bottom: 30px;
        }
        
        .intro-text p {
            margin-bottom: 20px;
        }
        
        .mission-vision {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }
        
        .mission-card, .vision-card {
            background-color: var(--light-blue);
            border-radius: 8px;
            padding: 30px;
            text-align: center;
        }
        
        .mission-card h3, .vision-card h3 {
            font-size: 1.4rem;
            margin-bottom: 20px;
            color: var(--primary);
        }
        
        /* 协会章程 */
        .constitution-content {
            background-color: white;
            border-radius: 10px;
            padding: 40px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
            margin-bottom: 40px;
        }
        
        .chapter {
            margin-bottom: 30px;
        }
        
        .chapter-title {
            font-size: 1.4rem;
            margin-bottom: 15px;
            color: var(--primary);
            padding-bottom: 10px;
            border-bottom: 1px solid #eee;
        }
        
        .article {
            margin-bottom: 20px;
        }
        
        .article-title {
            font-weight: 600;
            margin-bottom: 10px;
            color: var(--dark);
        }
        
        .article-content {
            color: var(--gray);
            line-height: 1.6;
        }
        
        /* 组织架构 */
        .structure-content {
            background-color: white;
            border-radius: 10px;
            padding: 40px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
            margin-bottom: 40px;
        }
        
        .org-chart {
            margin: 40px 0;
            text-align: center;
        }
        
        .org-chart img {
            max-width: 100%;
            border-radius: 8px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        .departments {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }
        
        .department-card {
            background-color: var(--light-blue);
            border-radius: 8px;
            padding: 25px;
        }
        
        .department-title {
            font-size: 1.3rem;
            margin-bottom: 15px;
            color: var(--primary);
        }
        
        .department-desc {
            color: var(--gray);
            line-height: 1.6;
        }
        
        /* 加入协会 */
        .membership-content {
            background-color: white;
            border-radius: 10px;
            padding: 40px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
            margin-bottom: 40px;
        }
        
        .membership-types {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin: 40px 0;
        }
        
        .membership-card {
            background-color: var(--light-blue);
            border-radius: 8px;
            padding: 30px;
            text-align: center;
        }
        
        .membership-icon {
            font-size: 40px;
            color: var(--primary);
            margin-bottom: 20px;
        }
        
        .membership-title {
            font-size: 1.3rem;
            margin-bottom: 15px;
            color: var(--dark);
        }
        
        .membership-desc {
            color: var(--gray);
            line-height: 1.6;
            margin-bottom: 20px;
        }
        
        .membership-features {
            text-align: left;
            margin-top: 20px;
        }
        
        .membership-features ul {
            list-style: none;
        }
        
        .membership-features li {
            margin-bottom: 10px;
            padding-left: 25px;
            position: relative;
        }
        
        .membership-features li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--primary);
            font-weight: bold;
        }
        
        .application-process {
            margin: 40px 0;
        }
        
        .process-steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-top: 30px;
        }
        
        .process-step {
            text-align: center;
            padding: 20px;
            background-color: var(--light-blue);
            border-radius: 8px;
        }
        
        .step-number {
            width: 40px;
            height: 40px;
            background-color: var(--primary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 15px;
            font-weight: bold;
        }
        
        .step-desc {
            color: var(--gray);
        }
        
        /* 联系方式 */
        .contact-content {
            background-color: white;
            border-radius: 10px;
            padding: 40px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
            margin-bottom: 40px;
        }
        
        .contact-methods {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin: 40px 0;
        }
        
        .contact-card {
            text-align: center;
            padding: 30px;
            background-color: var(--light-blue);
            border-radius: 8px;
        }
        
        .contact-icon {
            font-size: 40px;
            color: var(--primary);
            margin-bottom: 20px;
        }
        
        .contact-title {
            font-size: 1.3rem;
            margin-bottom: 15px;
            color: var(--dark);
        }
        
        .contact-info {
            color: var(--gray);
            line-height: 1.6;
        }
        
        .map-container {
            margin: 40px 0;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        .map-container iframe {
            width: 100%;
            height: 400px;
            border: none;
        }
        
        /* 通用按钮样式 */
        .btn {
            display: inline-block;
            padding: 12px 30px;
            background-color: var(--primary);
            color: white;
            text-decoration: none;
            border-radius: 50px;
            font-weight: 600;
            transition: all 0.3s;
            margin-top: 20px;
        }
        
        .btn:hover {
            background-color: var(--secondary);
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
        }