:root {
            --primary-color: #1a56db;
            --secondary-color: #046c4e;
            --dark-color: #1f2937;
            --light-color: #f9fafb;
            --accent-color: #dc2626;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            line-height: 1.6;
            color: #333;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .hero-section {
            background: linear-gradient(135deg, rgba(26, 86, 219, 0.9) 0%, rgba(4, 108, 78, 0.85) 100%), url('https://images.unsplash.com/photo-1450101499163-c8848c66ca85?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2070&q=80') center/cover no-repeat;
            color: white;
            padding: 120px 0 100px;
        }
        .section-title {
            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: 3px;
            background-color: var(--primary-color);
        }
        .card-hover {
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15) !important;
        }
        .service-icon {
            width: 70px;
            height: 70px;
            background-color: rgba(26, 86, 219, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            color: var(--primary-color);
            font-size: 28px;
        }
        .flink {
            display: inline-block;
            padding: 8px 20px;
            margin: 5px 10px;
            background-color: #f8f9fa;
            border-radius: 4px;
            color: #495057;
            text-decoration: none;
            border: 1px solid #dee2e6;
            transition: all 0.3s ease;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-3px);
        }
        .footer {
            background-color: var(--dark-color);
            color: #e5e7eb;
            padding-top: 60px;
            padding-bottom: 30px;
        }
        .footer a {
            color: #d1d5db;
            text-decoration: none;
            transition: color 0.2s;
        }
        .footer a:hover {
            color: white;
        }
        .contact-info i {
            width: 30px;
            color: var(--primary-color);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            cursor: pointer;
            z-index: 1000;
            opacity: 0;
            transition: opacity 0.3s;
            border: none;
        }
        .back-to-top.show {
            opacity: 1;
        }
        .timeline-item {
            position: relative;
            padding-left: 30px;
            margin-bottom: 30px;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: 0;
            top: 8px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background-color: var(--primary-color);
        }
        .timeline-item::after {
            content: '';
            position: absolute;
            left: 5px;
            top: 20px;
            width: 2px;
            height: calc(100% + 10px);
            background-color: #e5e7eb;
        }
        .timeline-item:last-child::after {
            display: none;
        }
        .project-card img {
            transition: transform 0.5s ease;
        }
        .project-card:hover img {
            transform: scale(1.05);
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-color);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 80px 0 60px;
            }
            .stats-number {
                font-size: 2.5rem;
            }
            .section-title {
                margin-bottom: 30px;
            }
        }