:root {
            --primary-color: #0056a8;
            --secondary-color: #f8b500;
            --dark-color: #1a2b4c;
            --light-color: #f8f9fa;
            --gray-color: #6c757d;
        }
        body {
            font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
            color: #333;
            line-height: 1.7;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .hero-section {
            background: linear-gradient(rgba(26, 43, 76, 0.85), rgba(0, 86, 168, 0.9)), url('https://images.unsplash.com/photo-1541888946425-d81bb19240f5?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') no-repeat center center/cover;
            color: white;
            padding: 150px 0;
            position: relative;
        }
        .hero-section h1 {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.3);
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 100px 0;
            }
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 50px;
            color: var(--dark-color);
            font-weight: 700;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 80px;
            height: 4px;
            background-color: var(--secondary-color);
        }
        .text-center .section-title:after {
            left: 50%;
            transform: translateX(-50%);
        }
        .card-hover {
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: none;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            height: 100%;
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: #004080;
            border-color: #004080;
            transform: translateY(-2px);
        }
        .btn-secondary {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            color: #333;
            padding: 12px 30px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-secondary:hover {
            background-color: #e0a500;
            border-color: #e0a500;
            color: #333;
            transform: translateY(-2px);
        }
        .icon-box {
            width: 70px;
            height: 70px;
            background-color: rgba(0, 86, 168, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            color: var(--primary-color);
            font-size: 28px;
        }
        .service-item {
            padding: 30px;
            border-radius: 10px;
            background-color: white;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: all 0.3s;
            height: 100%;
        }
        .service-item:hover {
            background-color: var(--primary-color);
            color: white;
        }
        .service-item:hover .icon-box {
            background-color: rgba(255,255,255,0.2);
            color: white;
        }
        .service-item:hover h3 {
            color: white;
        }
        .stats-box {
            text-align: center;
            padding: 30px 20px;
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: transform 0.3s;
        }
        .stats-box:hover {
            transform: translateY(-5px);
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-color);
            line-height: 1;
        }
        .project-card {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transition: all 0.3s;
            height: 100%;
        }
        .project-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .project-card img {
            height: 250px;
            object-fit: cover;
            width: 100%;
        }
        footer {
            background-color: var(--dark-color);
            color: #ddd;
        }
        footer a {
            color: #ddd;
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: var(--secondary-color);
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .copyright {
            background-color: rgba(0,0,0,0.2);
            padding: 20px 0;
            border-top: 1px solid rgba(255,255,255,0.1);
        }
        .friendlink {
            display: inline-block;
            padding: 8px 15px;
            margin: 5px;
            background-color: rgba(255,255,255,0.1);
            border-radius: 5px;
            transition: all 0.3s;
            color: #ddd;
            text-decoration: none;
        }
        .friendlink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        .flink {
            font-weight: 500;
        }
        .breadcrumb {
            background-color: rgba(0,0,0,0.03);
            border-radius: 0;
        }
        .contact-info-box {
            padding: 25px;
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            margin-bottom: 30px;
            text-align: center;
            transition: transform 0.3s;
            height: 100%;
        }
        .contact-info-box:hover {
            transform: translateY(-5px);
        }
        .contact-info-box i {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 15px;
        }
        .form-control, .form-select {
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 5px;
            margin-bottom: 20px;
            transition: all 0.3s;
        }
        .form-control:focus, .form-select:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(0, 86, 168, 0.25);
        }
        .timeline {
            position: relative;
            max-width: 1200px;
            margin: 0 auto;
        }
        .timeline::after {
            content: '';
            position: absolute;
            width: 6px;
            background-color: var(--primary-color);
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -3px;
        }
        @media (max-width: 768px) {
            .timeline::after {
                left: 31px;
            }
        }
        .timeline-item {
            padding: 10px 40px;
            position: relative;
            width: 50%;
            box-sizing: border-box;
        }
        .timeline-item:nth-child(odd) {
            left: 0;
        }
        .timeline-item:nth-child(even) {
            left: 50%;
        }
        @media (max-width: 768px) {
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            .timeline-item:nth-child(even) {
                left: 0;
            }
        }
        .timeline-content {
            padding: 20px;
            background-color: white;
            position: relative;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .timeline-item:nth-child(odd) .timeline-content::after {
            content: " ";
            position: absolute;
            top: 15px;
            right: -15px;
            border: 10px solid transparent;
            border-left-color: white;
        }
        .timeline-item:nth-child(even) .timeline-content::after {
            content: " ";
            position: absolute;
            top: 15px;
            left: -15px;
            border: 10px solid transparent;
            border-right-color: white;
        }
        @media (max-width: 768px) {
            .timeline-item:nth-child(odd) .timeline-content::after,
            .timeline-item:nth-child(even) .timeline-content::after {
                left: -15px;
                border: 10px solid transparent;
                border-right-color: white;
                border-left-color: transparent;
                right: auto;
            }
        }
        .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;
            text-decoration: none;
            font-size: 1.2rem;
            box-shadow: 0 3px 10px rgba(0,0,0,0.2);
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--dark-color);
            color: white;
            transform: translateY(-3px);
        }