/* 赢政天下历史页面专用样式 */

/* 面包屑导航 */
.breadcrumb {
    margin: 20px 0;
    font-size: 14px;
    color: #666;
}

.breadcrumb a {
    color: #3b5998;
}

.breadcrumb a:hover {
    text-decoration: underline;
}
/* 品牌核心定位展示 */
.brand-mission {
    background-color: #f5f7fa;
    padding: 60px 0;
    text-align: center;
}

.mission-card {
    max-width: 800px;
    margin: 0 auto;
    background-color: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    position: relative;
    overflow: hidden;
}

.mission-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(135deg, #3b5998 0%, #1f3e75 100%);
}

.mission-card h2 {
    color: var(--primary-dark);
    font-size: 28px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.mission-card h2 i {
    color: var(--primary);
}

.mission-tagline {
    font-size: 22px;
    color: var(--secondary-dark);
    margin-bottom: 20px;
    font-weight: 600;
}

.mission-description {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.mission-description strong {
    color: var(--primary-dark);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .mission-card {
        padding: 30px 20px;
    }

    .mission-card h2 {
        font-size: 24px;
    }

    .mission-tagline {
        font-size: 20px;
    }

    .mission-description {
        font-size: 16px;
    }
}

/* 页面标题 */
.page-title {
    margin: 30px 0;
    text-align: center;
}

.page-title h1 {
    font-size: 32px;
    color: #1f3e75;
    margin-bottom: 10px;
    font-weight: 700;
}

.title-meta {
    font-size: 14px;
    color: #888;
    display: flex;
    justify-content: center;
    gap: 20px;
}

.title-meta i {
    margin-right: 5px;
    color: #3b5998;
}

/* 历史时间线 */
.history-timeline {
    margin: 50px 0;
    position: relative;
}

.timeline-container {
    position: relative;
}

.timeline-container::before {
    content: "";
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 3px;
    background-color: #e6effe;
    transform: translateX(-50%);
    z-index: 0;
}

.timeline-marker {
    position: relative;
    z-index: 2;
    text-align: center;
    margin: 30px 0;
}

.timeline-start {
    margin-top: 0;
}

.timeline-marker .year {
    display: inline-block;
    background-color: #3b5998;
    color: white;
    padding: 8px 15px;
    border-radius: 30px;
    font-weight: bold;
    font-size: 18px;
    position: relative;
    z-index: 2;
}

.marker-line {
    height: 3px;
    background-color: #3b5998;
    width: 100px;
    margin: 10px auto;
    position: relative;
    z-index: 1;
}

.timeline-section {
    margin: 50px 0;
    position: relative;
    z-index: 1;
}

.timeline-header {
    text-align: center;
    margin-bottom: 20px;
}

.timeline-header h2 {
    display: inline-block;
    color: #1f3e75;
    font-size: 24px;
    padding: 10px 20px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.timeline-header h2 i {
    margin-right: 10px;
    color: #3b5998;
}

.history-content-card {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.05);
    padding: 30px;
    margin: 0 auto;
    max-width: 800px;
}

.history-content-card p {
    margin-bottom: 15px;
    line-height: 1.8;
    color: #444;
    font-size: 16px;
}

.history-content-card h3 {
    font-size: 20px;
    color: #1f3e75;
    margin: 25px 0 15px;
    border-bottom: 1px solid #e6effe;
    padding-bottom: 10px;
}

.history-content-card strong {
    color: #1f3e75;
    font-weight: 600;
}

.history-image {
    margin: 25px 0;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 3px 15px rgba(0, 0, 0, 0.1);
}

.history-image img {
    width: 100%;
    height: auto;
    display: block;
}

.image-caption {
    background-color: #f4f7fd;
    color: #666;
    padding: 10px 15px;
    font-size: 14px;
    text-align: center;
}

/* 任务和平台列表 */
.mission-list, .platform-list {
    list-style: none;
    padding: 0;
}

.mission-list li, .platform-list li {
    margin-bottom: 12px;
    padding-left: 25px;
    position: relative;
    line-height: 1.6;
}

.mission-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #4caf50;
    font-weight: bold;
}

.platform-list i {
    position: absolute;
    left: 0;
    color: #3b5998;
}

/* 致敬区域 */
.tribute-section {
    margin: 60px 0;
}

.tribute-content {
    background: linear-gradient(135deg, #f0f4ff 0%, #e6effe 100%);
    text-align: center;
}

.tribute-content h2 {
    color: #1f3e75;
    font-size: 24px;
    margin-bottom: 20px;
}

.tribute-content h2 i {
    color: #e91e63;
    margin-right: 10px;
}

.tribute-quote {
    font-size: 20px;
    color: #1f3e75;
    font-style: italic;
    margin: 25px 0 10px;
    line-height: 1.5;
}

/* 留言区 */
.comments-section {
    margin: 60px 0;
}

.comment-form-container {
    margin-bottom: 30px;
}

.comment-form textarea {
    width: 100%;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    resize: vertical;
    outline: none;
    transition: border-color 0.3s;
    font-family: inherit;
    font-size: 15px;
}

.comment-form textarea:focus {
    border-color: #3b5998;
}

.comment-submit-btn {
    background-color: #3b5998;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 10px;
    font-size: 15px;
    transition: background-color 0.2s;
}

.comment-submit-btn:hover {
    background-color: #1f3e75;
}

.comments-list {
    margin-top: 30px;
}

.comment-item {
    display: flex;
    margin-bottom: 25px;
    gap: 15px;
}

.comment-avatar {
    flex-shrink: 0;
}

.comment-avatar img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
}

.comment-content {
    flex-grow: 1;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 1px 8px rgba(0, 0, 0, 0.05);
    padding: 15px;
}

.comment-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
}

.comment-author {
    font-weight: bold;
    color: #1f3e75;
}

.comment-time {
    color: #888;
    font-size: 13px;
}

.comment-content p {
    color: #333;
    line-height: 1.6;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .page-title h1 {
        font-size: 26px;
    }
    
    .title-meta {
        flex-direction: column;
        gap: 5px;
        align-items: center;
    }
    
    .timeline-container::before {
        left: 30px;
    }
    
    .timeline-marker {
        text-align: left;
        padding-left: 30px;
    }
    
    .marker-line {
        width: 60px;
        margin-left: 0;
    }
    
    .timeline-header {
        text-align: left;
    }
    
    .timeline-header h2 {
        font-size: 20px;
        padding: 8px 15px;
    }
    
    .history-content-card {
        padding: 20px;
    }
    
    .comment-item {
        flex-direction: column;
    }
    
    .comment-avatar {
        margin-bottom: 10px;
    }
    
    .comment-header {
        flex-direction: column;
    }
}

@media (max-width: 576px) {
    .page-title h1 {
        font-size: 22px;
    }
    
    .timeline-header h2 {
        font-size: 18px;
    }
    
    .history-content-card p {
        font-size: 15px;
    }
    
    .tribute-quote {
        font-size: 18px;
    }
}

/* 嬴政天下历史经典文章 */
.classic-articles {
    margin: 40px 0;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}

.article-card {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    padding: 15px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.15);
}

.article-title {
    font-size: 17px;
    font-weight: bold;
    margin-bottom: 10px;
    color: #3b5998;
}

.article-excerpt {
    font-size: 14px;
    color: #666;
    line-height: 1.5;
}
/* 网站内容结构六大板块 */
.site-structure {
    background-color: #f5f7fa;
    padding: 60px 0;
}

.site-structure .section-title {
    text-align: center;
    margin-bottom: 40px;
}

.site-structure .title-text {
    font-size: 28px;
    color: var(--primary-dark);
    position: relative;
}

.structure-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.structure-card {
    background-color: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-top: 4px solid var(--primary);
}

.structure-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.1);
}

.structure-card .card-icon {
    width: 70px;
    height: 70px;
    background-color: var(--bg-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    transition: background-color 0.3s ease;
}

.structure-card:hover .card-icon {
    background-color: var(--primary);
}

.structure-card .card-icon i {
    font-size: 32px;
    color: var(--primary);
    transition: color 0.3s ease;
}

.structure-card:hover .card-icon i {
    color: white;
}

.structure-card h3 {
    color: var(--primary-dark);
    font-size: 20px;
    margin-bottom: 15px;
    font-weight: 700;
}

.structure-card ul {
    list-style-type: disc;
    padding-left: 20px;
    color: var(--text-secondary);
}

.structure-card ul li {
    margin-bottom: 10px;
    line-height: 1.6;
    font-size: 15px;
}

/* 响应式调整 */
@media (max-width: 1200px) {
    .structure-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .structure-grid {
        grid-template-columns: 1fr;
    }

    .site-structure .title-text {
        font-size: 24px;
    }

    .structure-card {
        padding: 25px;
    }
}

       .about-page {
            max-width: 1200px;
            margin: 0 auto;
            padding: 40px 20px;
        }

        .about-hero {
            text-align: center;
            margin-bottom: 50px;
        }

        .about-hero h1 {
            font-size: 36px;
            color: var(--primary-dark);
            margin-bottom: 15px;
        }

        .about-hero .subtitle {
            font-size: 20px;
            color: var(--text-secondary);
        }

        .history-timeline,
        .brand-mission,
        .core-values,
        .platform-impact {
            margin-bottom: 60px;
        }

        .history-timeline h2,
        .brand-mission h2,
        .core-values h2,
        .platform-impact h2 {
            text-align: center;
            margin-bottom: 40px;
            color: var(--primary-dark);
        }

        .timeline-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .timeline-item {
            background-color: white;
            border-radius: 12px;
            padding: 30px;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
            border-top: 4px solid var(--primary);
        }

        .timeline-item .year {
            font-size: 48px;
            color: var(--primary-light);
            margin-bottom: 20px;
            font-weight: bold;
        }

        .mission-content {
            text-align: center;
            max-width: 800px;
            margin: 0 auto;
            font-size: 18px;
            line-height: 1.8;
            color: var(--text-secondary);
        }

        .values-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .value-card {
            text-align: center;
            background-color: white;
            padding: 30px;
            border-radius: 12px;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
        }

        .value-card i {
            font-size: 48px;
            color: var(--primary);
            margin-bottom: 20px;
        }

        .platform-impact .impact-stats {
            display: flex;
            justify-content: center;
            gap: 50px;
        }

        .stat-item {
            text-align: center;
        }

        .stat-item .number {
            display: block;
            font-size: 48px;
            color: var(--primary-dark);
            font-weight: bold;
        }

        .stat-item .label {
            color: var(--text-secondary);
        }

        @media (max-width: 992px) {
            .timeline-grid,
            .values-grid {
                grid-template-columns: 1fr;
            }

            .platform-impact .impact-stats {
                flex-direction: column;
                align-items: center;
            }
        }

/* 网站内容连系我们 */
        .contact-page {
            max-width: 1200px;
            margin: 0 auto;
            padding: 40px 20px;
        }

        .contact-header {
            text-align: center;
            margin-bottom: 50px;
        }

        .contact-header h1 {
            font-size: 36px;
            color: var(--primary-dark);
            margin-bottom: 15px;
        }

        .contact-header .subtitle {
            font-size: 18px;
            color: var(--text-secondary);
        }

        .contact-methods {
            margin-bottom: 50px;
        }

        .contact-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .contact-card {
            background-color: white;
            border-radius: 12px;
            padding: 30px;
            text-align: center;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
            border-top: 4px solid var(--primary);
            transition: transform 0.3s ease;
        }

        .contact-card:hover {
            transform: translateY(-10px);
        }

        .contact-icon {
            font-size: 48px;
            color: var(--primary);
            margin-bottom: 20px;
        }

        .contact-card h3 {
            color: var(--primary-dark);
            margin-bottom: 15px;
        }

        .contact-card p {
            color: var(--text-secondary);
            margin-bottom: 10px;
        }

        .contact-form {
            background-color: white;
            border-radius: 12px;
            padding: 40px;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
            margin-bottom: 50px;
        }

        .contact-form h2 {
            text-align: center;
            color: var(--primary-dark);
            margin-bottom: 30px;
        }

        .form-row {
            display: flex;
            gap: 20px;
            margin-bottom: 20px;
        }

        .form-group {
            flex: 1;
        }

        .form-group label {
            display: block;
            margin-bottom: 10px;
            color: var(--text-secondary);
        }

        .form-group input,
        .form-group select,
        .form-group textarea {
            width: 100%;
            padding: 12px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 16px;
        }

        .submit-btn {
            display: block;
            width: 100%;
            padding: 15px;
            background-color: var(--primary);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 18px;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }

        .submit-btn:hover {
            background-color: var(--primary-dark);
        }

        .social-media {
            text-align: center;
        }

        .social-media h2 {
            color: var(--primary-dark);
            margin-bottom: 30px;
        }

        .social-links {
            display: flex;
            justify-content: center;
            gap: 30px;
        }

        .social-link {
            color: var(--text-secondary);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: color 0.3s ease;
        }

        .social-link:hover {
            color: var(--primary);
        }

        .social-link i {
            font-size: 24px;
        }

        @media (max-width: 992px) {
            .contact-grid,
            .form-row {
                grid-template-columns: 1fr;
                flex-direction: column;
            }

            .social-links {
                flex-direction: column;
                align-items: center;
            }
        }
/*加入我们样式表*/

        .join-us-page {
            max-width: 1200px;
            margin: 0 auto;
            padding: 40px 20px;
        }

        .join-header {
            text-align: center;
            margin-bottom: 50px;
        }

        .join-header h1 {
            font-size: 36px;
            color: var(--primary-dark);
            margin-bottom: 15px;
        }

        .join-header .subtitle {
            font-size: 18px;
            color: var(--text-secondary);
        }

        .company-culture,
        .job-openings,
        .application-process,
        .join-form {
            margin-bottom: 60px;
        }

        h2 {
            text-align: center;
            color: var(--primary-dark);
            margin-bottom: 30px;
        }

        .culture-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .culture-card {
            background-color: white;
            border-radius: 12px;
            padding: 30px;
            text-align: center;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
            border-top: 4px solid var(--primary);
            transition: transform 0.3s ease;
        }

        .culture-card:hover {
            transform: translateY(-10px);
        }

        .culture-icon {
            font-size: 48px;
            color: var(--primary);
            margin-bottom: 20px;
        }

        .culture-card h3 {
            color: var(--primary-dark);
            margin-bottom: 15px;
        }

        .job-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .job-card {
            background-color: white;
            border-radius: 12px;
            padding: 25px;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
            border-top: 4px solid var(--primary);
        }

        .job-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }

        .job-header h3 {
            color: var(--primary-dark);
        }

        .job-type {
            color: var(--text-secondary);
            font-size: 14px;
        }

        .job-details ul {
            list-style-type: disc;
            padding-left: 20px;
            margin-bottom: 20px;
        }

        .apply-btn {
            display: block;
            text-align: center;
            padding: 10px;
            background-color: var(--primary);
            color: white;
            text-decoration: none;
            border-radius: 8px;
            transition: background-color 0.3s ease;
        }

        .apply-btn:hover {
            background-color: var(--primary-dark);
        }

        .process-timeline {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .process-step {
            text-align: center;
            position: relative;
        }

        .process-step:not(:last-child)::after {
            content: '';
            position: absolute;
            top: 30px;
            right: -50%;
            width: 100%;
            height: 2px;
            background-color: var(--border-color);
        }

        .step-number {
            width: 60px;
            height: 60px;
            background-color: var(--primary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 15px;
            font-size: 24px;
            font-weight: bold;
        }

        .join-form {
            background-color: white;
            border-radius: 12px;
            padding: 40px;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
        }

        .form-row {
            display: flex;
            gap: 20px;
            margin-bottom: 20px;
        }

        .form-group {
            flex: 1;
        }

        .form-group label {
            display: block;
            margin-bottom: 10px;
            color: var(--text-secondary);
        }

        .form-group input,
        .form-group select,
        .form-group textarea {
            width: 100%;
            padding: 12px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
        }

        .submit-btn {
            display: block;
            width: 100%;
            padding: 15px;
            background-color: var(--primary);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 18px;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }

        .submit-btn:hover {
            background-color: var(--primary-dark);
        }

        @media (max-width: 992px) {
            .culture-grid,
            .job-list,
            .form-row {
                grid-template-columns: 1fr;
                flex-direction: column;
            }

            .process-timeline {
                flex-direction: column;
            }

            .process-step:not(:last-child)::after {
                display: none;
            }

            .process-step {
                margin-bottom: 30px;
            }
        }

/* 补充样式表 - 支持优化后的首页 */

/* 英雄区域增强 */
.about-hero {
    padding: 50px 20px;
    text-align: center;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4eaf1 100%);
    border-radius: 8px;
    margin-bottom: 40px;
}

.about-hero h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: #2c3e50;
}

.about-hero .subtitle {
    font-size: 1.3rem;
    color: #34495e;
    margin-bottom: 25px;
}

.hero-tagline {
    margin: 30px auto;
    max-width: 800px;
    padding: 15px;
}

.highlight-text {
    background: linear-gradient(90deg, #3498db, #2980b9);
    color: white;
    padding: 10px 20px;
    border-radius: 30px;
    font-size: 1.2rem;
    font-weight: bold;
    display: inline-block;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* 发展历程优化 */
.timeline-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.timeline-item {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.timeline-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.year {
    background-color: #3498db;
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
    padding: 15px;
    text-align: center;
}

.timeline-item .content {
    padding: 20px;
}

.timeline-item h3 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 1.3rem;
}

/* 使命板块增强 */
.brand-mission {
    background-color: #f9f9f9;
    padding: 40px;
    border-radius: 8px;
    margin: 40px 0;
}

.brand-mission h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #2c3e50;
    font-size: 2rem;
}

.mission-content {
    max-width: 900px;
    margin: 0 auto;
    font-size: 1.1rem;
    line-height: 1.6;
    color: #34495e;
}

.mission-quote {
    margin: 30px 0;
    padding: 20px;
    border-left: 5px solid #3498db;
    background-color: rgba(52, 152, 219, 0.05);
}

.mission-quote blockquote {
    font-size: 1.2rem;
    font-style: italic;
    color: #2c3e50;
    text-align: center;
    margin: 0;
    padding: 0;
}

/* 核心价值观增强 */
.core-values {
    padding: 40px 0;
}

.core-values h2 {
    text-align: center;
    margin-bottom: 40px;
    color: #2c3e50;
    font-size: 2rem;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.value-card {
    background-color: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    text-align: center;
    transition: transform 0.3s ease;
}

.value-card:hover {
    transform: translateY(-5px);
}

.value-card i {
    font-size: 2.5rem;
    color: #3498db;
    margin-bottom: 20px;
}

.value-card h3 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.value-card p {
    color: #34495e;
    line-height: 1.5;
}

/* 社区贡献区块 */
.community-contribution {
    padding: 50px 0;
    background-color: #ecf0f1;
    border-radius: 8px;
    margin: 40px 0;
}

.community-contribution h2 {
    text-align: center;
    margin-bottom: 40px;
    color: #2c3e50;
    font-size: 2rem;
}

.contribution-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    padding: 0 20px;
}

.contribution-card {
    background-color: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.contribution-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.contribution-card i {
    font-size: 2.5rem;
    color: #3498db;
    margin-bottom: 20px;
}

.contribution-card h3 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.contribution-card p {
    color: #34495e;
    line-height: 1.5;
    margin-bottom: 20px;
}

.action-link {
    display: inline-block;
    color: #3498db;
    font-weight: bold;
    text-decoration: none;
    transition: color 0.3s ease;
}

.action-link:hover {
    color: #2980b9;
    text-decoration: underline;
}

/* 平台影响力增强 */
.platform-impact {
    padding: 50px 20px;
    text-align: center;
    margin: 40px 0;
}

.platform-impact h2 {
    margin-bottom: 40px;
    color: #2c3e50;
    font-size: 2rem;
}

.impact-stats {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 40px;
    margin-bottom: 50px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.number {
    font-size: 2.5rem;
    font-weight: bold;
    color: #3498db;
    margin-bottom: 10px;
}

.label {
    color: #34495e;
    font-size: 1.1rem;
}

/* 加入社区区块 */
.join-community {
    background-color: #f9f9f9;
    padding: 40px;
    border-radius: 8px;
    max-width: 800px;
    margin: 0 auto;
}

.join-community h3 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 1.5rem;
    text-align: center;
}

.join-community p {
    color: #34495e;
    margin-bottom: 30px;
    text-align: center;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.primary-cta, .secondary-cta {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
}

.primary-cta {
    background-color: #3498db;
    color: white;
    box-shadow: 0 4px 6px rgba(52, 152, 219, 0.2);
}

.primary-cta:hover {
    background-color: #2980b9;
    box-shadow: 0 6px 8px rgba(52, 152, 219, 0.3);
}

.secondary-cta {
    background-color: white;
    color: #3498db;
    border: 2px solid #3498db;
}

.secondary-cta:hover {
    background-color: rgba(52, 152, 219, 0.05);
}

/* 页脚增强 */
.community-spirit {
    font-style: italic;
    color: #7f8c8d;
    margin-top: 10px;
    font-size: 0.9rem;
}

/* 响应式优化 */
@media (max-width: 768px) {
    .about-hero h1 {
        font-size: 2rem;
    }
    
    .about-hero .subtitle {
        font-size: 1.1rem;
    }
    
    .highlight-text {
        font-size: 1rem;
        padding: 8px 16px;
    }
    
    .mission-quote blockquote {
        font-size: 1.1rem;
    }
    
    .impact-stats {
        gap: 20px;
    }
    
    .number {
        font-size: 2rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .primary-cta, .secondary-cta {
        width: 100%;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .about-hero {
        padding: 30px 15px;
    }
    
    .timeline-item, .value-card, .contribution-card {
        padding: 20px;
    }
    
    .year {
        font-size: 1.3rem;
        padding: 10px;
    }
    
    .brand-mission, .community-contribution, .join-community {
        padding: 25px 15px;
    }
    
    .platform-impact {
        padding: 30px 15px;
    }
    
    .impact-stats {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
}
       /* 核心价值观4列布局调整 */
        @media (min-width: 992px) {
            .values-grid {
                display: grid;
                grid-template-columns: repeat(4, 1fr);
                gap: 20px;
            }
        }
        
        @media (max-width: 991px) {
            .values-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        
        @media (max-width: 576px) {
            .values-grid {
                grid-template-columns: 1fr;
            }
        }
        
        /* 共建AI知识生态 */
        .community-contribution {
            text-align: center;
            padding: 50px 0;
            background-color: #f5f7fa;
            margin: 50px 0;
        }
        
        .community-contribution h2 {
            font-size: 28px;
            color: var(--primary-dark);
            margin-bottom: 40px;
        }
        
        .contribution-cards {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
            max-width: 1200px;
            margin: 0 auto;
        }
        
        .contribution-card {
            background-color: white;
            border-radius: 12px;
            padding: 30px;
            text-align: center;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s ease;
        }
        
        .contribution-card:hover {
            transform: translateY(-10px);
        }
        
        .contribution-card i {
            font-size: 48px;
            color: #3b5998;
            margin-bottom: 20px;
        }
        
        .contribution-card h3 {
            color: #1f3e75;
            font-size: 20px;
            margin-bottom: 15px;
        }
        
        .contribution-card p {
            color: #666;
            margin-bottom: 20px;
            line-height: 1.6;
        }
        
        .contribution-card .action-link {
            color: #3b5998;
            text-decoration: none;
            font-weight: bold;
        }
        
        .contribution-card .action-link:hover {
            text-decoration: underline;
        }
        
        /* 加入社区 */
        .join-community {
            background-color: white;
            border-radius: 12px;
            padding: 40px;
            text-align: center;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            max-width: 800px;
            margin: 50px auto 0;
        }
        
        .join-community h3 {
            color: #1f3e75;
            font-size: 24px;
            margin-bottom: 20px;
        }
        
        .join-community p {
            color: #666;
            margin-bottom: 30px;
            line-height: 1.6;
        }
        
        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 20px;
        }
        
        .cta-buttons a {
            display: inline-block;
            padding: 12px 30px;
            border-radius: 30px;
            text-decoration: none;
            font-weight: bold;
            transition: all 0.3s ease;
            min-width: 160px;
        }
        
        .primary-cta {
            background-color: #3b5998;
            color: white;
        }
        
        .primary-cta:hover {
            background-color: #1f3e75;
        }
        
        .secondary-cta {
            border: 2px solid #3b5998;
            color: #3b5998;
        }
        
        .secondary-cta:hover {
            background-color: rgba(59, 89, 152, 0.1);
        }
        
        @media (max-width: 992px) {
            .contribution-cards {
                grid-template-columns: repeat(1, 1fr);
                padding: 0 20px;
            }
            
            .cta-buttons {
                flex-direction: column;
                align-items: center;
            }
            
            .cta-buttons a {
                width: 100%;
            }
        }