:root {
            --primary-color: #1a5f7a;
            --secondary-color: #57cc99;
            --accent-color: #ff9a3c;
            --dark-color: #2d3748;
            --light-color: #f7fafc;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', 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;
        }
        .hero-section {
            background: linear-gradient(rgba(26, 95, 122, 0.85), rgba(26, 95, 122, 0.9)), url('https://images.unsplash.com/photo-1541888946425-d81bb19240f5?ixlib=rb-4.0.3&auto=format&fit=crop&w=1950&q=80') center/cover no-repeat;
            color: white;
            padding: 150px 0 100px;
        }
        .section-title {
            position: relative;
            margin-bottom: 3rem;
            padding-bottom: 1rem;
            color: var(--primary-color);
            font-weight: 700;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--secondary-color);
            border-radius: 2px;
        }
        .service-card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            transition: all 0.4s ease;
            height: 100%;
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
        }
        .service-card:hover {
            transform: translateY(-12px);
            box-shadow: 0 20px 30px rgba(0, 0, 0, 0.15);
        }
        .service-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 2rem;
        }
        .project-card {
            position: relative;
            overflow: hidden;
            border-radius: 12px;
            margin-bottom: 30px;
            box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
        }
        .project-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(26, 95, 122, 0.85);
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            opacity: 0;
            transition: opacity 0.4s ease;
            padding: 20px;
            color: white;
        }
        .project-card:hover .project-overlay {
            opacity: 1;
        }
        .timeline {
            position: relative;
            padding-left: 2rem;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 4px;
            background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
            border-radius: 2px;
        }
        .timeline-item {
            position: relative;
            margin-bottom: 2.5rem;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -2.4rem;
            top: 0.5rem;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background-color: var(--primary-color);
            border: 3px solid white;
            box-shadow: 0 0 0 4px var(--primary-color);
        }
        .contact-info-box {
            background: white;
            padding: 2rem;
            border-radius: 12px;
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
            text-align: center;
            height: 100%;
            transition: all 0.3s ease;
        }
        .contact-info-box:hover {
            transform: translateY(-8px);
            box-shadow: 0 15px 25px rgba(0, 0, 0, 0.12);
        }
        .contact-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 1.8rem;
        }
        .footer {
            background-color: #1a2530;
            color: #bbb;
            padding-top: 4rem;
            padding-bottom: 2rem;
        }
        .footer a {
            color: #bbb;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer a:hover {
            color: white;
        }
        .friendlink {
            background-color: #f8f9fa;
            padding: 3rem 0;
        }
        .flink {
            display: inline-block;
            padding: 8px 20px;
            margin: 5px 10px;
            background: white;
            border-radius: 50px;
            color: var(--primary-color);
            font-weight: 500;
            text-decoration: none;
            transition: all 0.3s ease;
            border: 1px solid #e0e0e0;
            box-shadow: 0 3px 6px rgba(0, 0, 0, 0.05);
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            border-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;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: all 0.4s ease;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--secondary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 120px 0 80px;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }