:root {
            --primary-color: #8a2be2;
            --secondary-color: #ff6b6b;
            --dark-color: #1a1a2e;
            --light-color: #f8f9fa;
            --gray-color: #6c757d;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            background-color: #fefefe;
            color: #333;
            line-height: 1.8;
            overflow-x: hidden;
        }
        header {
            background: linear-gradient(135deg, var(--dark-color), var(--primary-color));
            color: white;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .navbar-brand {
            font-weight: bold;
            font-size: 1.8rem;
            color: white !important;
        }
        .nav-link {
            color: rgba(255,255,255,0.9) !important;
            font-weight: 500;
            margin: 0 8px;
            transition: all 0.3s ease;
        }
        .nav-link:hover {
            color: var(--secondary-color) !important;
            transform: translateY(-2px);
        }
        .hero-section {
            background: url('https://images.unsplash.com/photo-1536440136628-849c177e76a1?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') no-repeat center center/cover;
            height: 90vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            color: white;
            position: relative;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            padding: 2rem;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: bold;
            margin-bottom: 1rem;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.7);
        }
        .hero-subtitle {
            font-size: 1.5rem;
            margin-bottom: 2rem;
            color: #f0f0f0;
        }
        section {
            padding: 5rem 0;
        }
        .section-title {
            font-size: 2.5rem;
            font-weight: bold;
            color: var(--dark-color);
            margin-bottom: 3rem;
            text-align: center;
            position: relative;
        }
        .section-title::after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
        }
        .card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 20px rgba(0,0,0,0.08);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .card-img-top {
            height: 250px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .card:hover .card-img-top {
            transform: scale(1.05);
        }
        .card-title {
            font-weight: bold;
            color: var(--dark-color);
            font-size: 1.4rem;
        }
        .card-text {
            color: var(--gray-color);
            font-size: 0.95rem;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.75rem 2rem;
            border-radius: 50px;
            font-weight: bold;
            transition: all 0.3s ease;
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: scale(1.05);
        }
        .friendlink {
            background-color: #f8f9fa;
            padding: 3rem 0;
            border-top: 1px solid #dee2e6;
            border-bottom: 1px solid #dee2e6;
        }
        .flink {
            display: inline-block;
            margin: 0.5rem 1rem;
            padding: 0.5rem 1.5rem;
            background: white;
            border-radius: 50px;
            color: var(--dark-color);
            text-decoration: none;
            font-weight: 500;
            box-shadow: 0 4px 8px rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        footer {
            background-color: var(--dark-color);
            color: white;
            padding: 3rem 0 1.5rem;
        }
        footer a {
            color: #cccccc;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        footer a:hover {
            color: var(--secondary-color);
        }
        .social-icons a {
            display: inline-block;
            width: 40px;
            height: 40px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            text-align: center;
            line-height: 40px;
            margin: 0 5px;
            transition: all 0.3s ease;
        }
        .social-icons a:hover {
            background: var(--primary-color);
            transform: rotate(15deg);
        }
        .responsive-img {
            max-width: 100%;
            height: auto;
            border-radius: 10px;
        }
        .text-justify {
            text-align: justify;
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .hero-subtitle {
                font-size: 1.2rem;
            }
            .section-title {
                font-size: 2rem;
            }
            section {
                padding: 3rem 0;
            }
        }