:root {
            --primary-color: #1a5276;
            --secondary-color: #e67e22;
            --accent-color: #2ecc71;
            --light-color: #f8f9fa;
            --dark-color: #2c3e50;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.8;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--dark-color);
        }
        a {
            text-decoration: none;
            color: var(--primary-color);
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary-color);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            border-radius: 30px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: translateY(-3px);
            box-shadow: var(--shadow);
        }
        .btn-secondary {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            color: white;
            padding: 10px 25px;
            border-radius: 30px;
            font-weight: 600;
        }
        .btn-secondary:hover {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            color: white;
        }
        .navbar {
            background-color: rgba(255,255,255,0.95);
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            padding: 15px 0;
            transition: var(--transition);
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-color);
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .nav-link {
            font-weight: 600;
            margin: 0 8px;
            color: var(--dark-color);
        }
        .nav-link:hover, .nav-link.active {
            color: var(--secondary-color);
        }
        .hero {
            background: linear-gradient(rgba(26, 82, 118, 0.85), rgba(44, 62, 80, 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 100px;
            text-align: center;
        }
        .hero h1 {
            font-size: 3.5rem;
            color: white;
            margin-bottom: 25px;
        }
        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto 30px;
        }
        section {
            padding: 80px 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 60px;
            position: relative;
        }
        .section-title h2 {
            font-size: 2.5rem;
            display: inline-block;
            padding-bottom: 15px;
        }
        .section-title h2:after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
        }
        .card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .card-img-top {
            height: 220px;
            object-fit: cover;
        }
        .card-body {
            padding: 25px;
        }
        .card-title {
            color: var(--primary-color);
            font-weight: 700;
        }
        .icon-box {
            width: 70px;
            height: 70px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            margin: 0 auto 20px;
            transition: var(--transition);
        }
        .service-card:hover .icon-box {
            background: var(--secondary-color);
            transform: rotateY(180deg);
        }
        .project-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 30px;
        }
        .project-item {
            position: relative;
            overflow: hidden;
            border-radius: 15px;
            box-shadow: var(--shadow);
        }
        .project-item img {
            width: 100%;
            height: 250px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .project-item:hover img {
            transform: scale(1.05);
        }
        .project-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: rgba(26, 82, 118, 0.9);
            color: white;
            padding: 20px;
            transform: translateY(100%);
            transition: transform 0.5s ease;
        }
        .project-item:hover .project-overlay {
            transform: translateY(0);
        }
        .contact-info {
            background: var(--light-color);
            padding: 30px;
            border-radius: 15px;
            box-shadow: var(--shadow);
        }
        .contact-info i {
            color: var(--secondary-color);
            font-size: 1.5rem;
            margin-right: 15px;
        }
        .contact-form input,
        .contact-form textarea {
            border-radius: 10px;
            padding: 15px;
            border: 1px solid #ddd;
            margin-bottom: 20px;
            transition: var(--transition);
        }
        .contact-form input:focus,
        .contact-form textarea:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(26, 82, 118, 0.25);
        }
        .friendlink {
            background: #f1f8ff;
            padding: 40px 0;
            border-top: 1px solid #eaeaea;
            border-bottom: 1px solid #eaeaea;
        }
        .flink {
            display: inline-block;
            padding: 10px 20px;
            margin: 8px;
            background: white;
            border-radius: 8px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.08);
            font-weight: 600;
            color: var(--dark-color);
            transition: var(--transition);
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-5px);
        }
        footer {
            background: var(--dark-color);
            color: #bbb;
            padding: 60px 0 20px;
        }
        footer a {
            color: #ddd;
        }
        footer a:hover {
            color: var(--secondary-color);
        }
        .footer-links h5 {
            color: white;
            margin-bottom: 20px;
            font-size: 1.2rem;
        }
        .footer-links ul {
            list-style: none;
            padding-left: 0;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .copyright {
            border-top: 1px solid #444;
            padding-top: 20px;
            margin-top: 40px;
            text-align: center;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.5rem;
            }
            section {
                padding: 50px 0;
            }
            .section-title h2 {
                font-size: 2rem;
            }
            .navbar-brand {
                font-size: 1.5rem;
            }
        }