:root {
            --primary-color: #0d6efd;
            --secondary-color: #6c757d;
            --accent-color: #198754;
            --light-bg: #f8f9fa;
            --dark-text: #212529;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
        }
        body {
            font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--dark-text);
            line-height: 1.8;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: #0a58ca;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .nav-link {
            font-weight: 500;
            transition: var(--transition);
        }
        .nav-link:hover {
            color: var(--primary-color) !important;
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(13, 110, 253, 0.85), rgba(25, 135, 84, 0.8)), url('https://images.unsplash.com/photo-1469474968028-56623f02e42e?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            padding: 120px 0;
            text-shadow: 1px 1px 4px rgba(0,0,0,0.5);
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
        }
        .section-padding {
            padding: 80px 0;
        }
        .section-title {
            position: relative;
            padding-bottom: 20px;
            margin-bottom: 50px;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--accent-color);
            border-radius: 2px;
        }
        .card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            transition: var(--transition);
            height: 100%;
            box-shadow: var(--shadow);
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 12px 24px rgba(0,0,0,0.15);
        }
        .card-img-top {
            height: 220px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .card:hover .card-img-top {
            transform: scale(1.05);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border: none;
            padding: 12px 28px;
            border-radius: 8px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #0a58ca;
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(13, 110, 253, 0.3);
        }
        .icon-box {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            background: rgba(13, 110, 253, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            color: var(--primary-color);
            font-size: 1.8rem;
        }
        .testimonial-card {
            background: var(--light-bg);
            border-left: 5px solid var(--primary-color);
            padding: 25px;
            border-radius: 0 12px 12px 0;
        }
        .footer {
            background: #2c3e50;
            color: #ecf0f1;
            padding: 60px 0 20px;
        }
        .footer a {
            color: #bdc3c7;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .footer a:hover {
            color: white;
        }
        .friendlink {
            background: #f8f9fa;
            padding: 40px 0;
            border-top: 1px solid #dee2e6;
            border-bottom: 1px solid #dee2e6;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 12px 24px;
            margin: 8px;
            border-radius: 8px;
            border: 1px solid #dee2e6;
            color: #495057;
            font-weight: 500;
            transition: var(--transition);
            text-decoration: none !important;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-3px);
        }
        .contact-info li {
            margin-bottom: 15px;
            font-size: 1.05rem;
        }
        .contact-info i {
            width: 30px;
            color: var(--primary-color);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: #0a58ca;
            transform: scale(1.1);
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .section-padding {
                padding: 50px 0;
            }
            .section-title::after {
                width: 60px;
            }
        }