:root {
            --primary-color: #1a237e;
            --secondary-color: #c2185b;
            --accent-color: #ff9800;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --text-color: #333;
            --text-light: #666;
            --transition: all 0.3s ease;
            --shadow: 0 5px 15px rgba(0,0,0,0.1);
            --shadow-hover: 0 10px 25px rgba(0,0,0,0.15);
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            color: var(--text-color);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--primary-color);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.98);
            box-shadow: var(--shadow);
            padding: 15px 0;
            transition: var(--transition);
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-color) !important;
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .nav-link {
            color: var(--primary-color) !important;
            font-weight: 600;
            margin: 0 8px;
            transition: var(--transition);
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--secondary-color) !important;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 3px;
            background: var(--secondary-color);
            bottom: 0;
            left: 0;
            transition: var(--transition);
        }
        .nav-link:hover::after, .nav-link.active::after {
            width: 100%;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1489599809516-9827b6d1cf13?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1770&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 180px 0 120px;
            text-align: center;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 20px;
            text-shadow: 2px 2px 5px rgba(0,0,0,0.5);
        }
        .hero-section p {
            font-size: 1.3rem;
            max-width: 800px;
            margin: 0 auto 40px;
            opacity: 0.9;
        }
        .btn-primary {
            background-color: var(--secondary-color);
            border: none;
            padding: 12px 30px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #a8104b;
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
        }
        .btn-outline-light {
            border: 2px solid white;
            padding: 10px 28px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-outline-light:hover {
            background-color: white;
            color: var(--primary-color);
            transform: translateY(-3px);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 60px;
            text-align: center;
        }
        .section-title::after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
        }
        .card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-hover);
        }
        .card-img-top {
            height: 220px;
            object-fit: cover;
            transition: var(--transition);
        }
        .card:hover .card-img-top {
            transform: scale(1.05);
        }
        .card-body {
            padding: 25px;
        }
        .badge {
            padding: 6px 12px;
            font-weight: 600;
        }
        .about-img {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: var(--shadow-hover);
        }
        .about-img img {
            width: 100%;
            height: auto;
            transition: var(--transition);
        }
        .about-img:hover img {
            transform: scale(1.03);
        }
        .feature-box {
            padding: 30px;
            background: white;
            border-radius: 10px;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
            text-align: center;
        }
        .feature-box:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-hover);
        }
        .feature-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 25px;
            color: white;
            font-size: 1.8rem;
        }
        .stats {
            background: linear-gradient(rgba(26, 35, 126, 0.9), rgba(26, 35, 126, 0.9)), url('https://images.unsplash.com/photo-1517604931442-7e0c8ed2963c?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1770&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 80px 0;
        }
        .stat-item {
            text-align: center;
            padding: 20px;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            margin-bottom: 10px;
            color: white;
        }
        .stat-text {
            font-size: 1.2rem;
            opacity: 0.9;
        }
        .team-member {
            text-align: center;
            margin-bottom: 40px;
        }
        .team-img {
            width: 200px;
            height: 200px;
            border-radius: 50%;
            object-fit: cover;
            margin: 0 auto 20px;
            border: 5px solid white;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .team-member:hover .team-img {
            transform: scale(1.05);
            border-color: var(--secondary-color);
        }
        .contact-info {
            background: var(--light-color);
            padding: 40px;
            border-radius: 10px;
            height: 100%;
        }
        .contact-icon {
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            margin-right: 15px;
            flex-shrink: 0;
        }
        .contact-item {
            display: flex;
            margin-bottom: 30px;
            align-items: center;
        }
        .friendlink {
            background-color: #f8f9fa;
            padding: 60px 0;
        }
        .flink {
            display: inline-block;
            background: white;
            color: var(--primary-color);
            padding: 12px 25px;
            margin: 8px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-5px);
            text-decoration: none;
        }
        footer {
            background-color: var(--dark-color);
            color: white;
            padding: 60px 0 20px;
        }
        footer a {
            color: #ddd;
            text-decoration: none;
            transition: var(--transition);
        }
        footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .footer-links h5 {
            color: white;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-links h5::after {
            content: '';
            position: absolute;
            width: 40px;
            height: 3px;
            background: var(--secondary-color);
            bottom: 0;
            left: 0;
        }
        .copyright {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 20px;
            margin-top: 40px;
            text-align: center;
            color: #aaa;
            font-size: 0.9rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            cursor: pointer;
            z-index: 999;
            box-shadow: var(--shadow);
            transition: var(--transition);
            opacity: 0;
            visibility: hidden;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--primary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 992px) {
            .hero-section h1 {
                font-size: 2.8rem;
            }
            .hero-section {
                padding: 150px 0 100px;
            }
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.2rem;
            }
            .hero-section p {
                font-size: 1.1rem;
            }
            .section-title {
                margin-bottom: 40px;
            }
            .stat-number {
                font-size: 2.5rem;
            }
        }
        @media (max-width: 576px) {
            .navbar-brand {
                font-size: 1.5rem;
            }
            .hero-section {
                padding: 120px 0 80px;
            }
            .hero-section h1 {
                font-size: 1.8rem;
            }
            .btn-primary, .btn-outline-light {
                padding: 10px 20px;
                font-size: 0.9rem;
            }
        }
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.8s ease, transform 0.8s ease;
        }
        .fade-in.visible {
            opacity: 1;
            transform: translateY(0);
        }