:root {
            --primary-color: #0066cc;
            --secondary-color: #00a896;
            --light-bg: #f8f9fa;
            --dark-text: #333;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--dark-text);
            line-height: 1.8;
            overflow-x: hidden;
        }
        h1, h2, h3, h4 {
            font-weight: 700;
            color: var(--primary-color);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 4px 12px rgba(0, 102, 204, 0.1);
            padding: 1rem 0;
            transition: var(--transition);
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-color) !important;
        }
        .nav-link {
            font-weight: 600;
            color: #555 !important;
            margin: 0 0.5rem;
            position: relative;
        }
        .nav-link:hover {
            color: var(--primary-color) !important;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--secondary-color);
            transition: var(--transition);
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .hero {
            background: linear-gradient(rgba(0, 102, 204, 0.85), rgba(0, 168, 150, 0.8)), url('https://images.unsplash.com/photo-1559757148-5c350d0d3c56?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') no-repeat center center/cover;
            color: white;
            padding: 8rem 0;
            text-align: center;
        }
        .hero h1 {
            font-size: 3.5rem;
            color: white;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
        }
        .section-padding {
            padding: 5rem 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 3rem;
            position: relative;
        }
        .section-title::after {
            content: '';
            display: block;
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            margin: 1rem auto;
            border-radius: 2px;
        }
        .card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0, 102, 204, 0.15);
        }
        .card-img-top {
            height: 220px;
            object-fit: cover;
        }
        .icon-box {
            width: 80px;
            height: 80px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            font-size: 2rem;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border: none;
            padding: 0.8rem 2rem;
            border-radius: 50px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
            transform: scale(1.05);
        }
        .contact-info li {
            margin-bottom: 1rem;
            font-size: 1.1rem;
        }
        .contact-info i {
            color: var(--primary-color);
            margin-right: 1rem;
            width: 30px;
        }
        .footer {
            background: #1a1a1a;
            color: #ccc;
            padding: 3rem 0 1.5rem;
        }
        .footer a {
            color: #aaa;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .friendlink {
            background: var(--light-bg);
            padding: 2rem 0;
        }
        .flink {
            display: inline-block;
            padding: 0.5rem 1.5rem;
            margin: 0.5rem;
            background: white;
            border-radius: 50px;
            color: #555;
            border: 2px solid #ddd;
            text-decoration: none;
            font-weight: 600;
            transition: var(--transition);
        }
        .flink:hover {
            border-color: var(--primary-color);
            color: var(--primary-color);
            transform: translateY(-3px);
        }
        .form-control {
            border-radius: 10px;
            padding: 0.8rem;
            border: 1px solid #ccc;
            margin-bottom: 1.5rem;
        }
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(0, 102, 204, 0.25);
        }
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.5rem;
            }
            .section-padding {
                padding: 3rem 0;
            }
        }