* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
            line-height: 1.6;
            color: #333;
            background: #f8f9fa;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        
        .logo-section {
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        .logo-section img {
            height: 50px;
            width: auto;
        }
        
        .brand-name {
            font-size: 1.5rem;
            font-weight: bold;
        }
        
        nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
            flex-wrap: wrap;
        }
        
        nav a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            transition: opacity 0.3s;
        }
        
        nav a:hover {
            opacity: 0.8;
        }
        
        .search-container {
            background: white;
            padding: 2rem 0;
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
        }
        
        .search-box {
            display: flex;
            max-width: 600px;
            margin: 0 auto;
            border: 2px solid #667eea;
            border-radius: 50px;
            overflow: hidden;
        }
        
        .search-box input {
            flex: 1;
            padding: 12px 20px;
            border: none;
            font-size: 1rem;
            outline: none;
        }
        
        .search-box button {
            padding: 12px 30px;
            background: #667eea;
            color: white;
            border: none;
            cursor: pointer;
            font-size: 1rem;
            font-weight: bold;
            transition: background 0.3s;
        }
        
        .search-box button:hover {
            background: #764ba2;
        }
        
        .hero {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 4rem 0;
            text-align: center;
        }
        
        .hero h1 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }
        
        .hero p {
            font-size: 1.2rem;
            margin-bottom: 2rem;
        }
        
        .hero-banner {
            width: 100%;
            max-width: 900px;
            margin: 2rem auto;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.3);
        }
        
        .video-section {
            padding: 4rem 0;
            background: white;
        }
        
        .section-title {
            text-align: center;
            font-size: 2rem;
            margin-bottom: 3rem;
            color: #667eea;
        }
        
        .video-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin-bottom: 3rem;
        }
        
        .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;
            position: relative;
        }
        
        .video-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.15);
        }
        
        .video-card:hover .play-button {
            opacity: 1;
        }
        
        .video-thumbnail {
            width: 100%;
            height: 200px;
            object-fit: cover;
            position: relative;
        }
        
        .play-button {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 60px;
            height: 60px;
            background: rgba(102, 126, 234, 0.9);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: opacity 0.3s;
            pointer-events: none;
        }
        
        .play-button::after {
            content: "";
            width: 0;
            height: 0;
            border-left: 20px solid white;
            border-top: 12px solid transparent;
            border-bottom: 12px solid transparent;
            margin-left: 5px;
        }
        
        .video-info {
            padding: 1.5rem;
        }
        
        .video-title {
            font-size: 1.1rem;
            font-weight: bold;
            margin-bottom: 0.5rem;
            color: #333;
        }
        
        .video-meta {
            display: flex;
            gap: 1rem;
            color: #666;
            font-size: 0.9rem;
        }
        
        .video-stats {
            display: flex;
            gap: 0.5rem;
            align-items: center;
        }
        
        .content-section {
            padding: 4rem 0;
            background: #f8f9fa;
        }
        
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }
        
        .feature-card {
            background: white;
            padding: 2rem;
            border-radius: 15px;
            text-align: center;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transition: transform 0.3s;
        }
        
        .feature-card:hover {
            transform: translateY(-5px);
        }
        
        .feature-icon {
            font-size: 3rem;
            margin-bottom: 1rem;
        }
        
        .feature-title {
            font-size: 1.3rem;
            font-weight: bold;
            margin-bottom: 1rem;
            color: #667eea;
        }
        
        .feature-desc {
            color: #666;
            line-height: 1.8;
        }
        
        .experts-section {
            padding: 4rem 0;
            background: white;
        }
        
        .expert-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
        }
        
        .expert-card {
            background: #f8f9fa;
            padding: 2rem;
            border-radius: 15px;
            text-align: center;
            transition: transform 0.3s;
        }
        
        .expert-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        
        .expert-avatar {
            width: 100px;
            height: 100px;
            border-radius: 50%;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            margin: 0 auto 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            color: white;
        }
        
        .expert-name {
            font-size: 1.2rem;
            font-weight: bold;
            margin-bottom: 0.5rem;
        }
        
        .expert-title {
            color: #667eea;
            margin-bottom: 0.5rem;
        }
        
        .expert-credentials {
            font-size: 0.85rem;
            color: #999;
            margin-bottom: 1rem;
        }
        
        .expert-bio {
            color: #666;
            font-size: 0.9rem;
            line-height: 1.6;
            margin-bottom: 1rem;
        }
        
        .expert-actions {
            display: flex;
            gap: 0.5rem;
            justify-content: center;
            margin-top: 1rem;
        }
        
        .btn-expert {
            padding: 0.5rem 1rem;
            border: 2px solid #667eea;
            background: white;
            color: #667eea;
            border-radius: 20px;
            cursor: pointer;
            font-size: 0.85rem;
            transition: all 0.3s;
        }
        
        .btn-expert:hover {
            background: #667eea;
            color: white;
        }
        
        .partners-section {
            padding: 4rem 0;
            background: #f8f9fa;
        }
        
        .partners-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 2rem;
            align-items: center;
        }
        
        .partner-logo {
            background: white;
            padding: 2rem;
            border-radius: 10px;
            text-align: center;
            box-shadow: 0 3px 10px rgba(0,0,0,0.05);
            transition: transform 0.3s;
        }
        
        .partner-logo:hover {
            transform: scale(1.05);
        }
        
        .partner-logo img {
            max-width: 100%;
            height: 60px;
            object-fit: contain;
            filter: grayscale(100%);
            transition: filter 0.3s;
        }
        
        .partner-logo:hover img {
            filter: grayscale(0%);
        }
        
        .faq-section {
            padding: 4rem 0;
            background: white;
        }
        
        .faq-container {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .faq-item {
            background: #f8f9fa;
            padding: 2rem;
            border-radius: 10px;
            margin-bottom: 1.5rem;
        }
        
        .faq-question {
            font-size: 1.1rem;
            font-weight: bold;
            color: #667eea;
            margin-bottom: 1rem;
        }
        
        .faq-answer {
            color: #666;
            line-height: 1.8;
        }
        
        .howto-section {
            padding: 4rem 0;
            background: #f8f9fa;
        }
        
        .howto-steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-top: 2rem;
        }
        
        .howto-step {
            background: white;
            padding: 2rem;
            border-radius: 15px;
            text-align: center;
            position: relative;
        }
        
        .step-number {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: bold;
            margin: 0 auto 1rem;
        }
        
        .step-title {
            font-size: 1.1rem;
            font-weight: bold;
            margin-bottom: 0.8rem;
            color: #333;
        }
        
        .step-desc {
            color: #666;
            line-height: 1.6;
        }
        
        .testimonials-section {
            padding: 4rem 0;
            background: white;
        }
        
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
        }
        
        .testimonial-card {
            background: #f8f9fa;
            padding: 2rem;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
        }
        
        .testimonial-text {
            font-style: italic;
            color: #555;
            margin-bottom: 1rem;
            line-height: 1.8;
        }
        
        .testimonial-author {
            font-weight: bold;
            color: #667eea;
        }
        
        .rating {
            color: #ffc107;
            margin-bottom: 0.5rem;
        }
        
        .contact-section {
            padding: 4rem 0;
            background: #f8f9fa;
        }
        
        .contact-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }
        
        .contact-card {
            background: white;
            padding: 2rem;
            border-radius: 15px;
            text-align: center;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
        }
        
        .contact-icon {
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }
        
        .contact-title {
            font-weight: bold;
            margin-bottom: 0.5rem;
            color: #667eea;
        }
        
        .contact-info {
            color: #666;
            line-height: 1.8;
        }
        
        footer {
            background: #2c3e50;
            color: white;
            padding: 3rem 0 1rem;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        
        .footer-section h3 {
            margin-bottom: 1rem;
            color: #667eea;
        }
        
        .footer-section ul {
            list-style: none;
        }
        
        .footer-section ul li {
            margin-bottom: 0.5rem;
        }
        
        .footer-section a {
            color: #bbb;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-section a:hover {
            color: white;
        }
        
        .social-links {
            display: flex;
            gap: 1rem;
            margin-top: 1rem;
            flex-wrap: wrap;
        }
        
        .social-btn {
            padding: 0.5rem 1rem;
            background: #667eea;
            color: white;
            text-decoration: none;
            border-radius: 5px;
            transition: background 0.3s;
        }
        
        .social-btn:hover {
            background: #764ba2;
        }
        
        .footer-bottom {
            border-top: 1px solid #444;
            padding-top: 2rem;
            text-align: center;
            color: #bbb;
        }
        
        .qr-codes {
            display: flex;
            justify-content: center;
            gap: 3rem;
            margin-bottom: 1.5rem;
            flex-wrap: wrap;
        }
        
        .qr-code {
            text-align: center;
        }
        
        .qr-code img {
            width: 120px;
            height: 120px;
            border-radius: 10px;
            background: white;
            padding: 5px;
            margin-bottom: 0.5rem;
        }
        
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 1.8rem;
            }
            
            .hero p {
                font-size: 1rem;
            }
            
            nav ul {
                gap: 1rem;
            }
            
            .section-title {
                font-size: 1.5rem;
            }
        }