/* CSS Reset & Variables */
        :root {
            --primary-color: #2ecc71;
            --secondary-color: #27ae60;
            --dark-bg: #1a1a1a;
            --card-bg: #ffffff;
            --text-main: #333333;
            --text-light: #666666;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }

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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #f4f7f6;
            color: var(--text-main);
            line-height: 1.6;
        }

        /* Header Styles */
        header {
            background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
            color: white;
            padding: 1rem 0;
            /*position: sticky;*/
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }

        .container {
            width: 90%;
            max-width: 1200px;
            margin: 0 auto;
        }

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

        .logo {
            font-size: 1.5rem;
            font-weight: bold;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        nav ul {
            list-style: none;
            display: flex;
            gap: 20px;
        }

        nav a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
            opacity: 0.9;
        }

        nav a:hover {
            opacity: 1;
            text-decoration: underline;
        }

        /* Hero Section with Background Image */
        .hero {
            position: relative;
            height: 60vh;
            min-height: 400px;
            background-image: url('https://q7.itc.cn/images01/20250328/d06573c0c41246c39e6f5545f6a47f84.jpeg');
            background-size: cover;
            background-position: center;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            color: white;
        }

        .hero-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            padding: 20px;
        }

        .hero-text h1 {
            font-size: 3rem;
            margin-bottom: 15px;
            text-shadow: 0 2px 4px rgba(0,0,0,0.5);
        }

        .hero-text p {
            font-size: 1.2rem;
            color: #f0f0f0;
            margin-bottom: 30px;
            text-shadow: 0 1px 2px rgba(0,0,0,0.5);
        }

        .cta-button {
            display: inline-block;
            padding: 12px 30px;
            background-color: var(--primary-color);
            color: white;
            text-decoration: none;
            border-radius: 30px;
            font-weight: bold;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(46, 204, 113, 0.4);
        }

        .cta-button:hover {
            background-color: var(--secondary-color);
            transform: translateY(-2px);
        }

        /* Section Title */
        .section-header {
            text-align: center;
            padding: 40px 0 20px;
        }

        .section-header h2 {
            font-size: 2rem;
            color: var(--text-main);
            margin-bottom: 10px;
        }

        .section-header p {
            color: var(--text-light);
        }

        /* Video Grid */
        .video-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            padding: 20px 0 60px;
        }

        .video-card {
            background: var(--card-bg);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            cursor: pointer;
            height: 100%;
        }

        .video-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 15px rgba(0,0,0,0.15);
        }

        .card-thumb {
            position: relative;
            padding-bottom: 56.25%;
            background-color: #ddd;
            overflow: hidden;
        }

        .card-thumb img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .video-card:hover .card-thumb img {
            transform: scale(1.05);
        }

        .play-icon {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 50px;
            height: 50px;
            background: rgba(0,0,0,0.6);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            pointer-events: none;
            transition: var(--transition);
        }

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

        .play-icon::after {
            content: '';
            display: block;
            width: 0;
            height: 0;
            border-left: 15px solid white;
            border-top: 10px solid transparent;
            border-bottom: 10px solid transparent;
            margin-left: 5px;
        }

        .card-content {
            padding: 20px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }

        .card-title {
            font-size: 1.2rem;
            margin-bottom: 10px;
            color: var(--text-main);
            font-weight: 600;
            
            /* Single line truncation with ellipsis */
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            max-width: 100%;
        }

        .card-desc {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-bottom: 15px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex-grow: 1;
        }

        .card-meta {
            display: flex;
            justify-content: space-between;
            font-size: 0.85rem;
            color: #999;
            margin-top: auto;
        }

        /* Footer */
        footer {
            background-color: #333;
            color: white;
            padding: 40px 0;
            text-align: center;
            margin-top: auto;
        }

        .footer-links {
            margin-bottom: 20px;
        }

        .footer-links a {
            color: #ccc;
            margin: 0 10px;
            text-decoration: none;
        }

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

        /* Mobile Responsiveness */
        @media (max-width: 768px) {
            .nav-wrapper {
                flex-direction: column;
                gap: 15px;
            }
            
            .hero-text h1 {
                font-size: 2rem;
            }

            .hero-text p {
                font-size: 1rem;
            }

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