/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏样式 */
.top-nav {
    background-color: #fff;
    color: #333;
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.top-nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    color: #333;
    text-decoration: none;
    font-size: 24px;
    font-weight: bold;
    display: flex;
    align-items: center;
}

.logo a::before {
    content: 'V';
    display: inline-block;
    width: 32px;
    height: 32px;
    line-height: 32px;
    text-align: center;
    background: #0052d9;
    color: #fff;
    border-radius: 4px;
    margin-right: 10px;
    font-size: 20px;
}

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

.nav-menu li {
    margin-left: 30px;
}

.nav-menu a {
    color: #333;
    text-decoration: none;
    font-size: 16px;
    -webkit-transition: color 0.3s;
    -moz-transition: color 0.3s;
    -o-transition: color 0.3s;
    transition: color 0.3s;
    position: relative;
    padding: 5px 0;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: #0052d9;
    -webkit-transition: width 0.3s;
    -moz-transition: width 0.3s;
    -o-transition: width 0.3s;
    transition: width 0.3s;
}

.nav-menu a:hover {
    color: #0052d9;
}

.nav-menu a:hover::after {
    width: 100%;
}

/* 轮播图样式 */
.carousel-section {
    position: relative;
    height: 600px;
    overflow: hidden;
    background-color: #f0f2f5;
}

.carousel-container {
    position: relative;
    height: 100%;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    -webkit-transition: opacity 0.5s;
    -moz-transition: opacity 0.5s;
    -o-transition: opacity 0.5s;
    transition: opacity 0.5s;
}

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

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

.carousel-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: #333;
    z-index: 10;
}

.carousel-content h1 {
    font-size: 48px;
    margin-bottom: 20px;
    font-weight: 600;
}

.carousel-content p {
    font-size: 20px;
    margin-bottom: 30px;
    color: #666;
}

.carousel-controls {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    transform: translateY(-50%);
    z-index: 20;
    padding: 0 20px;
}

.carousel-prev, .carousel-next {
    background: rgba(255, 255, 255, 0.8);
    color: #333;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.carousel-prev:hover, .carousel-next:hover {
    background: #fff;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.carousel-indicators {
    position: absolute;
    bottom: 20px;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    z-index: 20;
}

.indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: 2px solid #0052d9;
    background: transparent;
    margin: 0 8px;
    cursor: pointer;
    transition: all 0.3s;
}

.indicator.active {
    background: #0052d9;
}

/* 按钮样式 */
.btn-primary {
    display: inline-block;
    background-color: #0052d9;
    color: #fff;
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 4px;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    font-size: 16px;
    font-weight: 600;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -o-transition: all 0.3s;
    transition: all 0.3s;
    border: 1px solid #0052d9;
}

.btn-primary:hover {
    background-color: #0047c0;
    -webkit-transform: translateY(-2px);
    -moz-transform: translateY(-2px);
    -o-transform: translateY(-2px);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 82, 217, 0.3);
    -webkit-box-shadow: 0 4px 12px rgba(0, 82, 217, 0.3);
    -moz-box-shadow: 0 4px 12px rgba(0, 82, 217, 0.3);
}

.btn-secondary {
    display: inline-block;
    background-color: transparent;
    color: #0052d9;
    padding: 12px 30px;
    text-decoration: none;
    border: 1px solid #0052d9;
    border-radius: 4px;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    font-size: 16px;
    font-weight: 600;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -o-transition: all 0.3s;
    transition: all 0.3s;
}

.btn-secondary:hover {
    background-color: #f0f6ff;
    -webkit-transform: translateY(-2px);
    -moz-transform: translateY(-2px);
    -o-transform: translateY(-2px);
    transform: translateY(-2px);
}

/* 视频推荐区域 */
.video-recommendation {
    padding: 80px 0;
    background-color: #fff;
}

.video-recommendation h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: #333;
    font-weight: 600;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.video-card {
    background-color: #fff;
    border-radius: 8px;
    -webkit-border-radius: 8px;
    -moz-border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    -webkit-box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    -moz-box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -o-transition: all 0.3s;
    transition: all 0.3s;
    border: 1px solid #e5e5e5;
}

.video-card:hover {
    -webkit-transform: translateY(-5px);
    -moz-transform: translateY(-5px);
    -o-transform: translateY(-5px);
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    -webkit-box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    -moz-box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.video-card a {
    text-decoration: none;
    color: #333;
    display: block;
}

.video-thumbnail {
    position: relative;
    height: 200px;
    overflow: hidden;
    background-color: #f5f5f5;
}

.video-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    -webkit-transition: transform 0.3s;
    -moz-transition: transform 0.3s;
    -o-transition: transform 0.3s;
    transition: transform 0.3s;
}

.video-card:hover .video-thumbnail img {
    -webkit-transform: scale(1.05);
    -moz-transform: scale(1.05);
    -o-transform: scale(1.05);
    transform: scale(1.05);
}

.play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -o-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background-color: rgba(0, 82, 217, 0.8);
    border-radius: 50%;
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    display: -webkit-box;
    display: -moz-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    -webkit-align-items: center;
    -moz-align-items: center;
    -ms-align-items: center;
    align-items: center;
    -webkit-justify-content: center;
    -moz-justify-content: center;
    -ms-justify-content: center;
    justify-content: center;
    color: #fff;
    font-size: 24px;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -o-transition: all 0.3s;
    transition: all 0.3s;
    box-shadow: 0 4px 12px rgba(0, 82, 217, 0.4);
    -webkit-box-shadow: 0 4px 12px rgba(0, 82, 217, 0.4);
    -moz-box-shadow: 0 4px 12px rgba(0, 82, 217, 0.4);
}

.video-card:hover .play-icon {
    background-color: #0052d9;
    -webkit-transform: translate(-50%, -50%) scale(1.1);
    -moz-transform: translate(-50%, -50%) scale(1.1);
    -o-transform: translate(-50%, -50%) scale(1.1);
    transform: translate(-50%, -50%) scale(1.1);
}

.video-card h3 {
    padding: 20px;
    font-size: 20px;
    margin-bottom: 10px;
    font-weight: 600;
}

.video-card p {
    padding: 0 20px 20px;
    color: #666;
}

.view-more {
    text-align: center;
    margin-top: 40px;
}

/* 公司介绍区域 */
.company-intro {
    padding: 80px 0;
    background-color: #f9f9f9;
}

.company-intro .container {
    display: flex;
    align-items: center;
    gap: 50px;
}

.intro-content {
    flex: 1;
}

.intro-content h2 {
    font-size: 36px;
    margin-bottom: 30px;
    color: #333;
    font-weight: 600;
}

.intro-content p {
    margin-bottom: 20px;
    line-height: 1.8;
    color: #666;
}

.intro-image {
    flex: 1;
}

.intro-image img {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

/* 页面标题 */
.page-header {
    background-color: #f0f2f5;
    padding: 60px 0;
    text-align: center;
    border-bottom: 1px solid #e5e5e5;
}

.page-header h1 {
    font-size: 36px;
    margin-bottom: 10px;
    color: #333;
    font-weight: 600;
}

.page-header p {
    font-size: 18px;
    color: #666;
}

/* 视频播放区域 */
.video-player-section {
    padding: 60px 0;
    background-color: #fff;
    border-bottom: 1px solid #e5e5e5;
}

.video-player {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    border: 1px solid #e5e5e5;
}

.video-container {
    position: relative;
    margin-bottom: 20px;
}

.video-container video {
    width: 100%;
    border-radius: 4px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.volume-control {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.6);
    color: #fff;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s;
    z-index: 10;
}

.volume-control:hover {
    background: rgba(0, 82, 217, 0.8);
    transform: scale(1.1);
}

#video-title {
    font-size: 24px;
    margin-bottom: 10px;
    color: #333;
    font-weight: 600;
}

#video-description {
    color: #666;
    line-height: 1.6;
}

/* 视频列表区域 */
.video-list-section {
    padding: 60px 0;
    background-color: #f9f9f9;
}

.video-list-section h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: #333;
    font-weight: 600;
}

/* 关于我们页面 */
.about-section {
    padding: 80px 0;
    background-color: #fff;
}

.about-section .container {
    display: flex;
    align-items: center;
    gap: 50px;
}

.about-content {
    flex: 1;
}

.about-content h2 {
    font-size: 36px;
    margin-bottom: 30px;
    color: #333;
    font-weight: 600;
}

.about-content p {
    margin-bottom: 20px;
    line-height: 1.8;
    color: #666;
}

.about-image {
    flex: 1;
}

.about-image img {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

/* 团队介绍 */
.team-section {
    padding: 80px 0;
    background-color: #f9f9f9;
}

.team-section h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: #333;
    font-weight: 600;
}

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

.team-member {
    text-align: center;
}

.team-member img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    object-fit: cover;
    margin-bottom: 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    -webkit-box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    -moz-box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -o-transition: all 0.3s;
    transition: all 0.3s;
}

.team-member h3 {
    font-size: 20px;
    margin-bottom: 5px;
    color: #333;
    font-weight: 600;
}

.team-member p {
    color: #666;
}

/* 联系我们 */
.contact-section {
    padding: 80px 0;
    background-color: #fff;
    border-top: 1px solid #e5e5e5;
}

.contact-section h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: #333;
    font-weight: 600;
}

.contact-info {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 30px;
}

.contact-item {
    display: -webkit-box;
    display: -moz-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    -webkit-align-items: center;
    -moz-align-items: center;
    -ms-align-items: center;
    align-items: center;
    gap: 15px;
    padding: 20px;
    background-color: #f9f9f9;
    border-radius: 8px;
    -webkit-border-radius: 8px;
    -moz-border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    -webkit-box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    -moz-box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    flex: 1;
    min-width: 250px;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -o-transition: all 0.3s;
    transition: all 0.3s;
}

.contact-item:hover {
    -webkit-transform: translateY(-5px);
    -moz-transform: translateY(-5px);
    -o-transform: translateY(-5px);
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    -webkit-box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    -moz-box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.contact-item i {
    font-size: 24px;
    color: #0052d9;
}

.contact-item p {
    margin: 0;
    color: #333;
}

/* 底部样式 */
.footer {
    background-color: #333;
    color: #fff;
    padding: 40px 0;
    border-top: 1px solid #e5e5e5;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-links {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
}

.footer-links a {
    color: #fff;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: #0052d9;
}

.footer-info p {
    margin: 5px 0;
    font-size: 14px;
    opacity: 0.8;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .top-nav .container {
        flex-direction: column;
        gap: 10px;
    }

    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }

    .nav-menu li {
        margin-left: 0;
    }

    .carousel-section {
        height: 400px;
    }

    .carousel-content h1 {
        font-size: 32px;
    }

    .carousel-content p {
        font-size: 16px;
    }

    .company-intro .container,
    .about-section .container {
        flex-direction: column;
        text-align: center;
    }

    .video-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }

    .contact-info {
        flex-direction: column;
        align-items: center;
    }

    .contact-item {
        width: 100%;
        max-width: 300px;
    }
}

@media (max-width: 480px) {
    .carousel-content h1 {
        font-size: 24px;
    }

    .carousel-content p {
        font-size: 14px;
    }

    .btn-primary,
    .btn-secondary {
        padding: 10px 20px;
        font-size: 14px;
    }

    .video-recommendation h2,
    .company-intro h2,
    .page-header h1,
    .video-list-section h2,
    .about-section h2,
    .team-section h2,
    .contact-section h2 {
        font-size: 28px;
    }

    .video-thumbnail {
        height: 150px;
    }
}