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

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f5f5f5;
}

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

/* Header */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

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

.logo img {
    width: 50px;
    height: 50px;
    border-radius: 10px;
}

.logo h1 {
    font-size: 28px;
    font-weight: bold;
}

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

nav a {
    color: white;
    text-decoration: none;
    font-size: 16px;
    transition: opacity 0.3s;
}

nav a:hover {
    opacity: 0.8;
}

/* Search */
.search-section {
    background: white;
    padding: 30px 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.search-box {
    display: flex;
    max-width: 600px;
    margin: 0 auto;
    gap: 10px;
}

.search-box input {
    flex: 1;
    padding: 12px 20px;
    border: 2px solid #ddd;
    border-radius: 25px;
    font-size: 16px;
}

.search-box button {
    padding: 12px 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-size: 16px;
}

/* Breadcrumb */
.breadcrumb {
    padding: 15px 0;
    font-size: 14px;
    color: #666;
}

.breadcrumb a {
    color: #667eea;
    text-decoration: none;
}

/* Section */
section {
    padding: 50px 0;
}

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

.section-title h2 {
    font-size: 32px;
    color: #333;
    margin-bottom: 10px;
}

.section-title p {
    color: #666;
    font-size: 16px;
}

/* Video Grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.video-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

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

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

.play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: rgba(255,255,255,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s;
}

.video-card:hover .play-button {
    opacity: 1;
}

.play-button::after {
    content: '';
    width: 0;
    height: 0;
    border-left: 20px solid #667eea;
    border-top: 12px solid transparent;
    border-bottom: 12px solid transparent;
    margin-left: 5px;
}

.video-info {
    padding: 20px;
}

.video-tag {
    display: inline-block;
    padding: 5px 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 15px;
    font-size: 12px;
    margin-bottom: 10px;
}

.video-info h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: #333;
}

.video-info p {
    color: #666;
    font-size: 14px;
    margin-bottom: 15px;
}

.video-meta {
    display: flex;
    gap: 15px;
    font-size: 13px;
    color: #999;
}

/* Expert Grid */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 30px;
}

.expert-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.expert-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin: 0 auto 20px;
    overflow: hidden;
}

.expert-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.expert-card h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.expert-card .role {
    color: #667eea;
    font-size: 14px;
    margin-bottom: 15px;
}

.expert-card .qualification {
    font-size: 13px;
    color: #666;
    margin-bottom: 15px;
}

.expert-social {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 15px;
}

.expert-social a {
    color: #667eea;
    text-decoration: none;
    font-size: 14px;
}

.contact-btn {
    display: inline-block;
    margin-top: 15px;
    padding: 10px 25px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 20px;
    text-decoration: none;
    font-size: 14px;
}

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

.review-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.review-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

.review-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
}

.review-info h4 {
    font-size: 16px;
    margin-bottom: 5px;
}

.review-rating {
    color: #ffc107;
}

.review-content {
    color: #666;
    line-height: 1.8;
    margin-bottom: 15px;
}

.review-meta {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    color: #999;
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.stat-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.stat-card .number {
    font-size: 36px;
    font-weight: bold;
    color: #667eea;
    margin-bottom: 10px;
}

.stat-card .label {
    color: #666;
    font-size: 16px;
}

/* Partners */
.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 30px;
    align-items: center;
}

.partner-logo {
    background: white;
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.partner-logo img {
    max-width: 100%;
    height: auto;
    opacity: 0.7;
    transition: opacity 0.3s;
}

.partner-logo:hover img {
    opacity: 1;
}

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

.faq-item {
    background: white;
    border-radius: 10px;
    padding: 25px;
    margin-bottom: 20px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.faq-item h3 {
    color: #667eea;
    margin-bottom: 10px;
    font-size: 18px;
}

.faq-item p {
    color: #666;
    line-height: 1.8;
}

/* Footer */
footer {
    background: #2c3e50;
    color: white;
    padding: 50px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 30px;
}

.footer-section h3 {
    margin-bottom: 20px;
    font-size: 20px;
}

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

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

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

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #444;
    color: #bbb;
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 20px;
    }
    
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .video-grid {
        grid-template-columns: 1fr;
    }
    
    .expert-grid {
        grid-template-columns: 1fr;
    }
}