:root {
            --primary-color: #2c3e50;
            --secondary-color: #3498db;
            --accent-color: #e74c3c;
            --light-color: #ecf0f1;
            --dark-color: #2c3e50;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            color: #333;
            line-height: 1.8;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            color: var(--primary-color);
            transition: var(--transition);
            padding: 0.5rem 1rem;
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            color: var(--secondary-color);
            background-color: rgba(52, 152, 219, 0.1);
            border-radius: 5px;
        }
        .hero-section {
            background: linear-gradient(135deg, #1a2980, #26d0ce);
            color: white;
            padding: 120px 0;
            position: relative;
            overflow: hidden;
        }
        .hero-section h1 {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        .hero-section p {
            font-size: 1.3rem;
            margin-bottom: 2rem;
        }
        .btn-custom {
            background-color: var(--accent-color);
            color: white;
            border: none;
            padding: 12px 30px;
            border-radius: 50px;
            font-weight: 600;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(231, 76, 60, 0.4);
        }
        .btn-custom:hover {
            background-color: #c0392b;
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(231, 76, 60, 0.6);
            color: white;
        }
        .section-title {
            color: var(--primary-color);
            font-weight: 700;
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 50px;
            text-align: center;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--secondary-color);
            border-radius: 2px;
        }
        .card-hover {
            transition: var(--transition);
            border: none;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            height: 100%;
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .icon-box {
            width: 70px;
            height: 70px;
            background-color: rgba(52, 152, 219, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 2rem;
            color: var(--secondary-color);
            transition: var(--transition);
        }
        .card-hover:hover .icon-box {
            background-color: var(--secondary-color);
            color: white;
        }
        .team-member img {
            width: 150px;
            height: 150px;
            object-fit: cover;
            border-radius: 50%;
            border: 5px solid var(--light-color);
            transition: var(--transition);
        }
        .team-member:hover img {
            border-color: var(--secondary-color);
            transform: scale(1.05);
        }
        .contact-info-box {
            background-color: var(--light-color);
            border-radius: 10px;
            padding: 30px;
            text-align: center;
            height: 100%;
            transition: var(--transition);
        }
        .contact-info-box:hover {
            background-color: var(--secondary-color);
            color: white;
        }
        .contact-info-box:hover .contact-icon {
            color: white;
        }
        .contact-icon {
            font-size: 2.5rem;
            color: var(--secondary-color);
            margin-bottom: 20px;
            transition: var(--transition);
        }
        .footer {
            background-color: var(--primary-color);
            color: white;
            padding: 60px 0 30px;
        }
        .footer a {
            color: #bdc3c7;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: var(--secondary-color);
            text-decoration: underline;
        }
        .friendlink a.flink {
            display: inline-block;
            background-color: #f8f9fa;
            color: var(--dark-color);
            padding: 10px 20px;
            margin: 5px 10px;
            border-radius: 5px;
            text-decoration: none;
            transition: var(--transition);
            font-weight: 500;
            border: 1px solid #dee2e6;
        }
        .friendlink a.flink:hover {
            background-color: var(--secondary-color);
            color: white;
            border-color: var(--secondary-color);
            transform: translateY(-3px);
        }
        .img-fluid-rounded {
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            transition: var(--transition);
        }
        .img-fluid-rounded:hover {
            transform: scale(1.02);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            text-decoration: none;
            opacity: 0.8;
            transition: var(--transition);
            z-index: 1000;
        }
        .back-to-top:hover {
            opacity: 1;
            transform: translateY(-5px);
            color: white;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section p {
                font-size: 1.1rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }