:root {
            --primary-color: #1a56db;
            --secondary-color: #0e9f6e;
            --dark-color: #1f2937;
            --light-color: #f9fafb;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.8;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .hero-section {
            background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1621905252507-b35492cc74b4?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            padding: 120px 0;
        }
        .section-title {
            color: var(--dark-color);
            border-left: 5px solid var(--primary-color);
            padding-left: 15px;
            margin-bottom: 40px;
        }
        .card-hover {
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        .flink a {
            display: inline-block;
            margin: 8px 15px;
            padding: 10px 20px;
            background-color: #f8f9fa;
            border-radius: 30px;
            color: var(--dark-color);
            text-decoration: none;
            transition: all 0.3s ease;
        }
        .flink a:hover {
            background-color: var(--primary-color);
            color: white;
        }
        .footer {
            background-color: var(--dark-color);
            color: white;
            padding: 50px 0 20px;
        }
        .footer a {
            color: #d1d5db;
            text-decoration: none;
        }
        .footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
        }
        .btn-primary:hover {
            background-color: #1e40af;
            border-color: #1e40af;
        }
        .icon-box {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            background-color: rgba(26, 86, 219, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
        }
        .icon-box i {
            font-size: 30px;
            color: var(--primary-color);
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.2rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }