:root {
            --primary-color: #1a365d;
            --secondary-color: #e63946;
            --accent-color: #f4a261;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --gray-color: #6c757d;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--dark-color);
            line-height: 1.8;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .section-header {
            position: relative;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-header h2 {
            font-size: 2.5rem;
            display: inline-block;
            position: relative;
            padding-bottom: 1rem;
        }
        .section-header h2:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
        }
        .section-header p {
            color: var(--gray-color);
            max-width: 700px;
            margin: 0 auto;
        }
        .hero-section {
            background: linear-gradient(rgba(26, 54, 93, 0.85), rgba(26, 54, 93, 0.9)), url('https://images.unsplash.com/photo-1497366754035-f200968a6e72?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80') no-repeat center center;
            background-size: cover;
            color: white;
            padding: 180px 0 120px;
            position: relative;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.98);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
            padding: 15px 0;
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .nav-link {
            font-weight: 600;
            color: var(--primary-color) !important;
            margin: 0 8px;
            position: relative;
            transition: color 0.3s;
        }
        .nav-link:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--secondary-color);
            transition: width 0.3s ease;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--secondary-color) !important;
        }
        .nav-link:hover:after, .nav-link.active:after {
            width: 100%;
        }
        .btn-primary {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            padding: 12px 30px;
            font-weight: 600;
            border-radius: 4px;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: #c1121f;
            border-color: #c1121f;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        .btn-outline-light {
            border-width: 2px;
            font-weight: 600;
            padding: 12px 30px;
            border-radius: 4px;
            transition: all 0.3s;
        }
        .btn-outline-light:hover {
            background-color: white;
            color: var(--primary-color);
            transform: translateY(-3px);
        }
        .service-card {
            background: white;
            border-radius: 10px;
            padding: 30px;
            height: 100%;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
            border: 1px solid rgba(0, 0, 0, 0.05);
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        .service-icon {
            width: 70px;
            height: 70px;
            background: rgba(230, 57, 70, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
        }
        .service-icon i {
            font-size: 30px;
            color: var(--secondary-color);
        }
        .portfolio-item {
            position: relative;
            overflow: hidden;
            border-radius: 8px;
            margin-bottom: 30px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        .portfolio-img {
            height: 300px;
            width: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }
        .portfolio-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(to top, rgba(26, 54, 93, 0.9), transparent);
            color: white;
            padding: 30px;
            transform: translateY(100%);
            transition: transform 0.5s;
        }
        .portfolio-item:hover .portfolio-overlay {
            transform: translateY(0);
        }
        .portfolio-item:hover .portfolio-img {
            transform: scale(1.1);
        }
        .client-logo {
            filter: grayscale(100%);
            opacity: 0.6;
            transition: all 0.3s;
            height: 60px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .client-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .testimonial-card {
            background: white;
            border-radius: 10px;
            padding: 30px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            height: 100%;
            position: relative;
        }
        .testimonial-card:before {
            content: "\201C";
            font-size: 5rem;
            color: rgba(230, 57, 70, 0.1);
            position: absolute;
            top: -20px;
            left: 20px;
            font-family: serif;
        }
        .flink {
            display: inline-block;
            padding: 10px 20px;
            background: rgba(26, 54, 93, 0.05);
            border-radius: 6px;
            margin: 5px 10px;
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s;
        }
        .flink:hover {
            background: var(--secondary-color);
            color: white;
            transform: translateY(-3px);
        }
        footer {
            background-color: var(--primary-color);
            color: white;
            padding-top: 80px;
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            display: block;
            margin-bottom: 10px;
            transition: all 0.3s;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .social-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.1);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-right: 10px;
            color: white;
            text-decoration: none;
            transition: all 0.3s;
        }
        .social-icon:hover {
            background: var(--secondary-color);
            transform: translateY(-3px);
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding: 20px 0;
            margin-top: 50px;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 150px 0 80px;
            }
            .section-header h2 {
                font-size: 2rem;
            }
            .portfolio-img {
                height: 250px;
            }
        }
        @media (max-width: 576px) {
            .hero-section {
                padding: 120px 0 60px;
            }
            .section-header h2 {
                font-size: 1.8rem;
            }
            .btn-primary, .btn-outline-light {
                padding: 10px 20px;
                font-size: 0.9rem;
            }
        }
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.8s, transform 0.8s;
        }
        .fade-in.visible {
            opacity: 1;
            transform: translateY(0);
        }
        .sticky-nav {
            padding: 10px 0;
            background-color: rgba(255, 255, 255, 0.98);
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
        }