:root {
            --primary-color: #1a56db;
            --secondary-color: #0ea5e9;
            --dark-color: #1e293b;
            --light-color: #f8fafc;
            --accent-color: #10b981;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: #334155;
            line-height: 1.7;
            overflow-x: hidden;
        }
        .navbar {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            transition: all 0.4s ease;
            padding: 0.8rem 0;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .nav-link {
            font-weight: 500;
            margin: 0 0.5rem;
            padding: 0.5rem 1rem !important;
            border-radius: 6px;
            transition: all 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            background: rgba(26, 86, 219, 0.1);
            color: var(--primary-color);
        }
        .hero-section {
            background: linear-gradient(135deg, #1e3a8a 0%, #0ea5e9 100%);
            color: white;
            padding: 8rem 0 6rem;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="rgba(255,255,255,0.05)" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,122.7C672,117,768,139,864,149.3C960,160,1056,160,1152,138.7C1248,117,1344,75,1392,53.3L1440,32L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>');
            background-size: cover;
            opacity: 0.3;
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
            font-weight: 700;
            color: var(--dark-color);
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 4px;
            background: var(--primary-color);
            border-radius: 2px;
        }
        .text-center .section-title::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .service-card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            transition: all 0.4s ease;
            background: white;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            height: 100%;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(26, 86, 219, 0.15);
        }
        .service-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
        }
        .service-icon i {
            font-size: 2rem;
            color: white;
        }
        .project-card {
            border-radius: 12px;
            overflow: hidden;
            transition: all 0.4s;
            border: none;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
        }
        .project-card:hover {
            transform: scale(1.03);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
        }
        .project-card img {
            transition: transform 0.8s ease;
            height: 250px;
            object-fit: cover;
        }
        .project-card:hover img {
            transform: scale(1.1);
        }
        .stat-card {
            background: white;
            border-radius: 12px;
            padding: 2.5rem 2rem;
            text-align: center;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
            border: 1px solid #e2e8f0;
        }
        .stat-card:hover {
            border-color: var(--primary-color);
            box-shadow: 0 15px 35px rgba(26, 86, 219, 0.1);
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
            margin-bottom: 0.5rem;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 1rem 2rem;
            border-radius: 10px;
            text-decoration: none;
            color: var(--dark-color);
            font-weight: 500;
            border: 1px solid #e2e8f0;
            transition: all 0.3s;
            margin: 0.5rem;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-3px);
        }
        .footer {
            background: var(--dark-color);
            color: #cbd5e1;
            padding: 4rem 0 2rem;
        }
        .footer a {
            color: #cbd5e1;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer a:hover {
            color: white;
        }
        .footer-title {
            color: white;
            font-weight: 600;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 0.75rem;
        }
        .footer-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 3px;
            background: var(--primary-color);
        }
        .contact-info li {
            margin-bottom: 1rem;
            display: flex;
            align-items: flex-start;
        }
        .contact-info i {
            color: var(--secondary-color);
            margin-right: 1rem;
            margin-top: 0.25rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            opacity: 0;
            transition: all 0.3s;
            z-index: 1000;
            box-shadow: 0 4px 15px rgba(26, 86, 219, 0.3);
        }
        .back-to-top.visible {
            opacity: 1;
        }
        .back-to-top:hover {
            background: var(--secondary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 6rem 0 4rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .stat-number {
                font-size: 2.5rem;
            }
        }