:root {
            --primary-color: #1a237e;
            --secondary-color: #283593;
            --accent-color: #3949ab;
            --light-color: #f5f5f5;
            --dark-color: #121212;
            --text-color: #333;
            --text-light: #777;
            --transition: all 0.3s ease;
        }
        body {
            font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
            color: var(--text-color);
            line-height: 1.8;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--primary-color);
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent-color);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            border-radius: 30px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
        }
        .section-padding {
            padding-top: 80px;
            padding-bottom: 80px;
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 150px 0;
            position: relative;
            overflow: hidden;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 20px;
        }
        .hero-section p {
            font-size: 1.2rem;
            opacity: 0.9;
        }
        .hero-section .btn-light {
            background-color: white;
            color: var(--primary-color);
            border-radius: 30px;
            padding: 12px 30px;
            font-weight: 600;
        }
        .hero-section .btn-light:hover {
            background-color: var(--light-color);
            transform: translateY(-3px);
        }
        .icon-box {
            background-color: white;
            padding: 30px;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            transition: var(--transition);
            height: 100%;
        }
        .icon-box:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0,0,0,0.15);
        }
        .icon-box i {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .flink {
            display: inline-block;
            background-color: var(--light-color);
            padding: 10px 20px;
            margin: 5px;
            border-radius: 8px;
            color: var(--text-color);
            transition: var(--transition);
        }
        .flink:hover {
            background-color: var(--accent-color);
            color: white;
            transform: scale(1.05);
        }
        friendlink {
            display: block;
            margin-top: 20px;
        }
        .card-hover {
            transition: var(--transition);
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.2);
        }
        .footer {
            background-color: var(--dark-color);
            color: white;
            padding: 60px 0 20px;
        }
        .footer a {
            color: #ccc;
        }
        .footer a:hover {
            color: white;
        }
        .navbar {
            background-color: white;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            padding: 15px 0;
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
            transition: var(--transition);
        }
        .navbar.scrolled {
            padding: 10px 0;
            background-color: rgba(255,255,255,0.95);
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-color);
        }
        .nav-link {
            font-weight: 600;
            margin: 0 10px;
            color: var(--text-color);
        }
        .nav-link:hover {
            color: var(--primary-color);
        }
        .mobile-img {
            max-width: 100%;
            height: auto;
            border-radius: 10px;
        }
        .contact-info i {
            color: var(--primary-color);
            margin-right: 10px;
        }
        .form-control {
            border-radius: 10px;
            padding: 15px;
            border: 1px solid #ddd;
        }
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(26, 35, 126, 0.25);
        }
        .sticky-top {
            position: -webkit-sticky;
            position: sticky;
            top: 0;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 100px 0;
            }
            .section-padding {
                padding-top: 60px;
                padding-bottom: 60px;
            }
        }