/* 糖心vlog - 主样式表 */
/* jtofl.cn - 影视传媒公司与视频社区 */

:root {
    --primary-color: #FF6B9D;
    --secondary-color: #FF8A65;
    --accent-color: #E91E63;
    --dark-color: #1a1a2e;
    --light-color: #f8f9fa;
    --text-color: #333;
    --text-light: #666;
    --gradient-primary: linear-gradient(135deg, #FF6B9D 0%, #FF8A65 100%);
    --shadow-light: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-medium: 0 4px 20px rgba(0,0,0,0.15);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-color);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

img {
    max-width: 100%;
    height: auto;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部导航 */
.header {
    background: var(--dark-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-medium);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    height: 45px;
    width: auto;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: bold;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    color: #fff;
    font-size: 1rem;
    padding: 8px 15px;
    border-radius: 20px;
    transition: var(--transition);
}

.nav-menu a:hover,
.nav-menu a.active {
    background: var(--gradient-primary);
    color: #fff;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
}

/* 搜索框 */
.search-bar {
    background: linear-gradient(135deg, #2d2d44 0%, #1a1a2e 100%);
    padding: 15px 0;
}

.search-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}

.search-input {
    width: 100%;
    max-width: 500px;
    padding: 12px 20px;
    border: 2px solid var(--primary-color);
    border-radius: 30px;
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

.search-input:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 10px rgba(255, 107, 157, 0.3);
}

.search-btn {
    background: var(--gradient-primary);
    border: none;
    padding: 12px 25px;
    border-radius: 30px;
    color: #fff;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

.search-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(255, 107, 157, 0.4);
}

/* Banner轮播 */
.hero-banner {
    position: relative;
    height: 500px;
    overflow: hidden;
}

.banner-slide {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease;
}

.banner-slide.active {
    opacity: 1;
}

.banner-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to right, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.3) 100%);
    display: flex;
    align-items: center;
}

.banner-content {
    color: #fff;
    padding-left: 50px;
    max-width: 600px;
}

.banner-content h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    line-height: 1.3;
}

.banner-content p {
    font-size: 1.1rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.btn-primary {
    display: inline-block;
    background: var(--gradient-primary);
    color: #fff;
    padding: 15px 35px;
    border-radius: 30px;
    font-size: 1rem;
    font-weight: 500;
    transition: var(--transition);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(255, 107, 157, 0.4);
}

/* 视频卡片 */
.section {
    padding: 60px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 40px;
}

.section-header h2 {
    font-size: 2rem;
    color: var(--dark-color);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.section-header p {
    color: var(--text-light);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 20px auto 0;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
}

.video-card {
    background: #fff;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-medium);
}

.video-thumbnail {
    position: relative;
    padding-top: 56.25%;
    overflow: hidden;
}

.video-thumbnail img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.video-card:hover .video-thumbnail img {
    transform: scale(1.1);
}

.play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    opacity: 0;
}

.play-btn::after {
    content: '';
    border-style: solid;
    border-width: 10px 0 10px 18px;
    border-color: transparent transparent transparent #fff;
    margin-left: 4px;
}

.video-card:hover .play-btn {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
}

.video-duration {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0,0,0,0.8);
    color: #fff;
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.85rem;
}

.video-info {
    padding: 15px;
}

.video-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    display: flex;
    justify-content: space-between;
    color: var(--text-light);
    font-size: 0.85rem;
}

.video-stats {
    display: flex;
    gap: 15px;
}

.video-stats span {
    display: flex;
    align-items: center;
    gap: 5px;
}

/* 专家展示 */
.experts-section {
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8eb 100%);
}

.expert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.expert-card {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 30px;
    text-align: center;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.expert-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.expert-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 20px;
    border: 4px solid var(--primary-color);
}

.expert-name {
    font-size: 1.3rem;
    font-weight: bold;
    margin-bottom: 5px;
}

.expert-title {
    color: var(--primary-color);
    font-size: 0.95rem;
    margin-bottom: 15px;
}

.expert-bio {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 20px;
    line-height: 1.6;
}

.expert-actions {
    display: flex;
    justify-content: center;
    gap: 10px;
}

.btn-outline {
    display: inline-block;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    padding: 10px 20px;
    border-radius: 25px;
    font-size: 0.9rem;
    transition: var(--transition);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: #fff;
}

/* 合作伙伴 */
.partners-section {
    background: var(--dark-color);
    color: #fff;
}

.partner-grid {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 40px;
}

.partner-logo {
    width: 120px;
    height: 80px;
    object-fit: contain;
    filter: brightness(0) invert(1);
    opacity: 0.7;
    transition: var(--transition);
}

.partner-logo:hover {
    opacity: 1;
    transform: scale(1.1);
}

/* 用户评价 */
.testimonials-section {
    background: linear-gradient(135deg, #fff5f7 0%, #fff 100%);
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.testimonial-card {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow-light);
    position: relative;
}

.testimonial-card::before {
    content: '"';
    position: absolute;
    top: 20px;
    left: 25px;
    font-size: 4rem;
    color: var(--primary-color);
    opacity: 0.2;
    font-family: Georgia, serif;
    line-height: 1;
}

.testimonial-content {
    font-size: 1rem;
    color: var(--text-color);
    line-height: 1.8;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 15px;
}

.testimonial-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
}

.testimonial-name {
    font-weight: 600;
    margin-bottom: 3px;
}

.testimonial-role {
    color: var(--text-light);
    font-size: 0.85rem;
}

/* 联系我们 */
.contact-section {
    background: linear-gradient(135deg, #1a1a2e 0%, #2d2d44 100%);
    color: #fff;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.contact-item h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.contact-item p {
    margin-bottom: 10px;
    opacity: 0.9;
}

.contact-item a {
    color: var(--secondary-color);
}

.contact-item a:hover {
    text-decoration: underline;
}

.qr-codes {
    display: flex;
    gap: 20px;
}

.qr-code {
    text-align: center;
}

.qr-code img {
    width: 100px;
    height: 100px;
    border-radius: 8px;
    margin-bottom: 8px;
}

.qr-code span {
    display: block;
    font-size: 0.85rem;
    opacity: 0.8;
}

/* FAQ */
.faq-section {
    background: #fff;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid #eee;
    padding: 20px 0;
}

.faq-question {
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--dark-color);
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--primary-color);
    transition: var(--transition);
}

.faq-item.active .faq-question::after {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    color: var(--text-light);
    line-height: 1.8;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding-top: 15px;
}

/* 页脚 */
.footer {
    background: var(--dark-color);
    color: #fff;
    padding: 50px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 1.1rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul a {
    color: rgba(255,255,255,0.7);
    transition: var(--transition);
}

.footer-section ul a:hover {
    color: var(--primary-color);
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--gradient-primary);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-bottom p {
    opacity: 0.7;
    font-size: 0.9rem;
}

.update-time {
    margin-top: 10px;
    font-size: 0.85rem;
    opacity: 0.6;
}

/* 分享按钮 */
.share-buttons {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
}

.share-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    transition: var(--transition);
}

.share-btn.wechat { background: #07C160; }
.share-btn.weibo { background: #E6162D; }
.share-btn.douyin { background: #000; }
.share-btn.bilibili { background: #00A1D6; }

.share-btn:hover {
    transform: scale(1.1);
}

/* 面包屑 */
.breadcrumb {
    padding: 15px 0;
    background: #f5f5f5;
}

.breadcrumb-list {
    display: flex;
    list-style: none;
    gap: 10px;
    font-size: 0.9rem;
}

.breadcrumb-list li::after {
    content: '/';
    margin-left: 10px;
    color: #999;
}

.breadcrumb-list li:last-child::after {
    content: '';
}

.breadcrumb-list a {
    color: var(--text-light);
}

.breadcrumb-list a:hover {
    color: var(--primary-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-inner {
        flex-wrap: wrap;
    }
    
    .nav-menu {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 0;
        padding-top: 20px;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-menu a {
        display: block;
        padding: 12px 15px;
        border-radius: 0;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero-banner {
        height: 350px;
    }
    
    .banner-content {
        padding: 20px;
    }
    
    .banner-content h1 {
        font-size: 1.8rem;
    }
    
    .section {
        padding: 40px 0;
    }
    
    .section-header h2 {
        font-size: 1.5rem;
    }
    
    .video-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .expert-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonial-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .qr-codes {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .video-grid {
        grid-template-columns: 1fr;
    }
    
    .logo-text {
        font-size: 1.2rem;
    }
    
    .search-container {
        flex-direction: column;
    }
    
    .search-input {
        width: 100%;
    }
}

/* 懒加载图片 */
img.lazy {
    opacity: 0;
    transition: opacity 0.3s ease;
}

img.lazy.loaded {
    opacity: 1;
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fadeInUp {
    animation: fadeInUp 0.6s ease forwards;
}

/* 模块分类标签 */
.category-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
}

.category-tag {
    padding: 8px 20px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid #ddd;
    color: var(--text-color);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

.category-tag:hover,
.category-tag.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: #fff;
}

/* AI功能模块 */
.ai-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.ai-feature-card {
    background: linear-gradient(135deg, #fff 0%, #f8f9fa 100%);
    border-radius: var(--border-radius);
    padding: 30px;
    text-align: center;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.ai-feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.ai-icon {
    width: 70px;
    height: 70px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 2rem;
}

.ai-feature-card h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--dark-color);
}

.ai-feature-card p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* 社区功能 */
.community-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.community-feature {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 25px;
    text-align: center;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.community-feature:hover {
    background: var(--gradient-primary);
    color: #fff;
}

.community-feature:hover p {
    color: rgba(255,255,255,0.9);
}

.community-feature h4 {
    font-size: 1.1rem;
    margin-bottom: 10px;
}

.community-feature p {
    font-size: 0.9rem;
    color: var(--text-light);
    transition: var(--transition);
}

/* 内页样式 */
.page-header {
    background: linear-gradient(135deg, var(--dark-color) 0%, #2d2d44 100%);
    padding: 60px 0;
    text-align: center;
    color: #fff;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.page-header p {
    font-size: 1.1rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

.content-section {
    padding: 50px 0;
}

.content-section:nth-child(even) {
    background: #f8f9fa;
}

/* 工具卡片 */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
}

.tool-card {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.tool-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 1.5rem;
    color: #fff;
}

.tool-card h3 {
    font-size: 1.2rem;
    margin-bottom: 12px;
    color: var(--dark-color);
}

.tool-card p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 20px;
}

.tool-card .btn-outline {
    font-size: 0.85rem;
    padding: 8px 18px;
}


/* 面包屑导航 */
.breadcrumb {
    background: #f8f9fa;
    padding: 10px 0;
    border-bottom: 1px solid #e9ecef;
}

.breadcrumb ol {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0;
    padding: 0;
}

.breadcrumb li {
    display: flex;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-light);
}

.breadcrumb li a {
    color: var(--primary-color);
}

.breadcrumb li a:hover {
    text-decoration: underline;
}

/* 视频标签 */
.video-tag {
    position: absolute;
    top: 10px;
    left: 10px;
    background: var(--gradient-primary);
    color: #fff;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}

/* 娱乐专区 */
.entertainment-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 25px;
}

.entertainment-card {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 30px;
    text-align: center;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.entertainment-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.entertainment-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.entertainment-card h4 {
    font-size: 1.2rem;
    color: var(--dark-color);
    margin-bottom: 10px;
}

.entertainment-card p {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* 专家资质徽章 */
.expert-credentials {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 15px;
}

.credential-badge {
    background: linear-gradient(135deg, #FFE5EC 0%, #FFF0F5 100%);
    color: var(--primary-color);
    padding: 5px 12px;
    border-radius: 15px;
    font-size: 0.75rem;
    font-weight: 500;
    border: 1px solid var(--primary-color);
}

/* FAQ问答 */
.faq-section {
    background: linear-gradient(135deg, #f5f7fa 0%, #fff 100%);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 25px;
    margin-bottom: 15px;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.faq-item:hover {
    box-shadow: var(--shadow-medium);
}

.faq-question {
    font-size: 1.1rem;
    color: var(--dark-color);
    margin-bottom: 12px;
    padding-left: 25px;
    position: relative;
}

.faq-question::before {
    content: 'Q';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.faq-answer {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.7;
    padding-left: 25px;
    position: relative;
}

.faq-answer::before {
    content: 'A';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

/* 分类标签 */
.category-tags {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 30px;
}

.category-tag {
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    background: #fff;
    border: 2px solid #e9ecef;
    color: var(--text-light);
}

.category-tag:hover,
.category-tag.active {
    background: var(--gradient-primary);
    border-color: var(--primary-color);
    color: #fff;
}

/* 社区功能 */
.community-features {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.community-feature {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 25px;
    text-align: center;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.community-feature:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.community-feature h4 {
    color: var(--primary-color);
    margin-bottom: 8px;
    font-size: 1rem;
}

.community-feature p {
    color: var(--text-light);
    font-size: 0.85rem;
}

/* AI功能卡片 */
.ai-features {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 25px;
}

.ai-feature-card {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 30px;
    text-align: center;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.ai-feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.ai-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.ai-feature-card h3 {
    font-size: 1.1rem;
    color: var(--dark-color);
    margin-bottom: 12px;
}

.ai-feature-card p {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* 联系我们 */
.contact-section {
    background: var(--dark-color);
    color: #fff;
}

.contact-section .section-header h2 {
    color: #fff;
}

.contact-section .section-header p {
    color: rgba(255,255,255,0.7);
}

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

.contact-item {
    background: rgba(255,255,255,0.1);
    border-radius: var(--border-radius);
    padding: 25px;
}

.contact-item h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.contact-item p {
    margin-bottom: 8px;
    font-size: 0.9rem;
    opacity: 0.9;
}

.contact-item a {
    color: var(--primary-color);
}

.qr-codes {
    display: flex;
    gap: 20px;
    margin-top: 15px;
}

.qr-code {
    text-align: center;
}

.qr-code img {
    width: 80px;
    height: 80px;
    border-radius: 8px;
    margin-bottom: 5px;
}

.qr-code span {
    font-size: 0.8rem;
    opacity: 0.8;
}

/* 分享按钮 */
.share-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.share-btn {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: bold;
    transition: var(--transition);
}

.share-btn.wechat { background: #07C160; }
.share-btn.weibo { background: #E6162D; }
.share-btn.douyin { background: #000; }
.share-btn.bilibili { background: #00A1D6; }

.share-btn:hover {
    transform: scale(1.1);
}

/* 页脚 */
.footer {
    background: #0d0d1a;
    color: #fff;
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    opacity: 0.8;
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    opacity: 1;
    color: var(--primary-color);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 30px;
    text-align: center;
}

.footer-bottom p {
    opacity: 0.7;
    font-size: 0.9rem;
    margin-bottom: 5px;
}

.update-time {
    color: var(--primary-color);
    font-size: 0.85rem !important;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .expert-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--dark-color);
        flex-direction: column;
        padding: 20px;
        gap: 10px;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero-banner {
        height: 400px;
    }
    
    .banner-content {
        padding: 20px;
    }
    
    .banner-content h1 {
        font-size: 1.8rem;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .video-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonial-grid {
        grid-template-columns: 1fr;
    }
    
    .category-tags {
        overflow-x: auto;
        flex-wrap: nowrap;
        justify-content: flex-start;
        padding-bottom: 10px;
    }
    
    .community-features {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .section {
        padding: 40px 0;
    }
    
    .section-header h2 {
        font-size: 1.5rem;
    }
    
    .community-features {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .qr-codes {
        justify-content: center;
    }
}