:root {
            --primary-color: #1a5f7a;
            --secondary-color: #2a9d8f;
            --accent-color: #e9c46a;
            --dark-color: #264653;
            --light-color: #f8f9fa;
            --gray-color: #6c757d;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            line-height: 1.6;
            color: #333;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--dark-color);
        }
        .navbar {
            background-color: rgba(26, 95, 122, 0.95);
            backdrop-filter: blur(10px);
            transition: all 0.3s ease;
            padding: 15px 0;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: white !important;
        }
        .navbar-brand span {
            color: var(--accent-color);
        }
        .nav-link {
            color: rgba(255, 255, 255, 0.9) !important;
            font-weight: 500;
            padding: 8px 15px !important;
            margin: 0 5px;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        .nav-link:hover, .nav-link.active {
            color: white !important;
            background-color: rgba(42, 157, 143, 0.3);
        }
        .hero-section {
            background: linear-gradient(rgba(26, 95, 122, 0.85), rgba(38, 70, 83, 0.9)), url('https://images.unsplash.com/photo-1541888946425-d81bb19240f5?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 150px 0 100px;
            position: relative;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 25px;
            text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
        }
        .hero-subtitle {
            font-size: 1.4rem;
            margin-bottom: 35px;
            opacity: 0.95;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 50px;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .section-padding {
            padding: 100px 0;
        }
        .card-hover {
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        .service-icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .project-card {
            overflow: hidden;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
        }
        .project-card img {
            transition: transform 0.5s ease;
        }
        .project-card:hover img {
            transform: scale(1.05);
        }
        .badge-custom {
            background-color: var(--accent-color);
            color: var(--dark-color);
            font-weight: 600;
            padding: 5px 15px;
            border-radius: 30px;
        }
        .contact-box {
            background-color: white;
            border-radius: 10px;
            padding: 30px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            height: 100%;
            transition: transform 0.3s ease;
        }
        .contact-box:hover {
            transform: translateY(-5px);
        }
        .contact-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .footer {
            background-color: var(--dark-color);
            color: rgba(255, 255, 255, 0.8);
            padding: 70px 0 30px;
        }
        .footer-title {
            color: white;
            margin-bottom: 25px;
            font-size: 1.3rem;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-title:after {
            content: '';
            position: absolute;
            width: 40px;
            height: 3px;
            background: var(--accent-color);
            bottom: 0;
            left: 0;
        }
        .footer-link {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: color 0.3s ease;
            display: block;
            margin-bottom: 10px;
        }
        .footer-link:hover {
            color: var(--accent-color);
            padding-left: 5px;
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            margin-top: 50px;
            text-align: center;
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
        }
        .friendlink {
            background-color: #f8f9fa;
            padding: 60px 0;
        }
        .flink {
            display: inline-block;
            background-color: white;
            padding: 12px 25px;
            margin: 8px;
            border-radius: 6px;
            text-decoration: none;
            color: var(--dark-color);
            font-weight: 500;
            transition: all 0.3s ease;
            border: 1px solid #eaeaea;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(26, 95, 122, 0.2);
        }
        .btn-primary-custom {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            font-weight: 600;
            border-radius: 6px;
            transition: all 0.3s ease;
        }
        .btn-primary-custom:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(42, 157, 143, 0.3);
        }
        .btn-secondary-custom {
            background-color: transparent;
            border: 2px solid white;
            color: white;
            padding: 10px 28px;
            font-weight: 600;
            border-radius: 6px;
            transition: all 0.3s ease;
        }
        .btn-secondary-custom:hover {
            background-color: white;
            color: var(--primary-color);
            transform: translateY(-3px);
        }
        .stats-box {
            text-align: center;
            padding: 30px 15px;
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            margin-bottom: 30px;
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
            margin-bottom: 10px;
        }
        .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: 1.2rem;
            text-decoration: none;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--secondary-color);
            color: white;
            transform: translateY(-5px);
        }
        .timeline {
            position: relative;
            padding-left: 30px;
            margin-bottom: 50px;
        }
        .timeline:before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 3px;
            background-color: var(--secondary-color);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 30px;
            padding-left: 30px;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -36px;
            top: 5px;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background-color: var(--primary-color);
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--secondary-color);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .hero-subtitle {
                font-size: 1.2rem;
            }
            .section-padding {
                padding: 60px 0;
            }
            .navbar-brand {
                font-size: 1.5rem;
            }
        }
        .qualification-badge {
            display: inline-block;
            background-color: #e9f5f4;
            color: var(--secondary-color);
            padding: 8px 20px;
            margin: 5px;
            border-radius: 30px;
            font-weight: 600;
            border: 1px dashed var(--secondary-color);
        }