:root {
            --primary-color: #1a365d;
            --secondary-color: #e63946;
            --accent-color: #ffb347;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --text-color: #333;
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            color: var(--text-color);
            line-height: 1.8;
            overflow-x: hidden;
            font-size: 1.05rem;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            border-radius: 2px;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.98);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
            padding: 1rem 0;
            transition: var(--transition);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .nav-link {
            font-weight: 600;
            color: var(--dark-color) !important;
            margin: 0 8px;
            padding: 8px 16px !important;
            border-radius: 4px;
            transition: var(--transition);
        }
        .nav-link:hover, .nav-link.active {
            color: white !important;
            background-color: var(--secondary-color);
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(26, 54, 93, 0.85), rgba(26, 54, 93, 0.9)), url('https://images.unsplash.com/photo-1552664730-d307ca884978?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2070&q=80') center/cover no-repeat fixed;
            color: white;
            padding: 180px 0 120px;
            position: relative;
            overflow: hidden;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 5px rgba(0, 0, 0, 0.3);
        }
        .hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 2.5rem;
            opacity: 0.9;
        }
        .btn-primary-custom {
            background: linear-gradient(to right, var(--secondary-color), var(--accent-color));
            border: none;
            color: white;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1.1rem;
            transition: var(--transition);
            box-shadow: 0 5px 15px rgba(230, 57, 70, 0.4);
        }
        .btn-primary-custom:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(230, 57, 70, 0.6);
            color: white;
        }
        .feature-card {
            background: white;
            border-radius: 12px;
            padding: 2.5rem 2rem;
            height: 100%;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
            border: 1px solid #eee;
            text-align: center;
        }
        .feature-card:hover {
            transform: translateY(-15px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
        }
        .feature-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary-color), #2c5282);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 2rem;
        }
        .service-card {
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
            height: 100%;
            background: white;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
        }
        .service-img {
            height: 220px;
            object-fit: cover;
            width: 100%;
        }
        .service-body {
            padding: 2rem;
        }
        .portfolio-item {
            position: relative;
            border-radius: 10px;
            overflow: hidden;
            margin-bottom: 30px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        .portfolio-img {
            width: 100%;
            height: 300px;
            object-fit: cover;
            transition: var(--transition);
        }
        .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: 2rem;
            transform: translateY(20px);
            opacity: 0;
            transition: var(--transition);
        }
        .portfolio-item:hover .portfolio-overlay {
            transform: translateY(0);
            opacity: 1;
        }
        .portfolio-item:hover .portfolio-img {
            transform: scale(1.05);
        }
        .testimonial-card {
            background: white;
            border-radius: 12px;
            padding: 2.5rem;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            margin: 15px;
            height: 100%;
            border-left: 5px solid var(--secondary-color);
        }
        .client-img {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            object-fit: cover;
            border: 3px solid #eee;
            margin-right: 1.5rem;
        }
        .news-card {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
            height: 100%;
            background: white;
        }
        .news-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .news-date {
            position: absolute;
            top: 15px;
            left: 15px;
            background: var(--secondary-color);
            color: white;
            padding: 8px 15px;
            border-radius: 5px;
            font-weight: 600;
        }
        .news-img {
            height: 240px;
            object-fit: cover;
            width: 100%;
        }
        .news-body {
            padding: 1.8rem;
        }
        .contact-info-box {
            background: white;
            border-radius: 10px;
            padding: 2rem;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
            height: 100%;
            text-align: center;
            transition: var(--transition);
            border-top: 4px solid var(--primary-color);
        }
        .contact-info-box:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
        }
        .contact-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--primary-color), #2c5282);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 1.8rem;
        }
        .form-control, .form-select {
            padding: 12px 15px;
            border-radius: 8px;
            border: 1px solid #ddd;
            margin-bottom: 1.5rem;
            transition: var(--transition);
        }
        .form-control:focus, .form-select:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(26, 54, 93, 0.25);
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 12px 25px;
            margin: 8px;
            border-radius: 8px;
            color: var(--primary-color);
            font-weight: 600;
            text-decoration: none;
            border: 2px solid #eee;
            transition: var(--transition);
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-5px);
        }
        footer {
            background: var(--primary-color);
            color: white;
            padding: 4rem 0 2rem;
        }
        .footer-links a {
            color: #ccc;
            text-decoration: none;
            transition: var(--transition);
            display: block;
            margin-bottom: 10px;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 8px;
        }
        .social-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            color: white;
            margin-right: 12px;
            transition: var(--transition);
        }
        .social-icon:hover {
            background: var(--secondary-color);
            transform: translateY(-5px);
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 2rem;
            margin-top: 3rem;
            text-align: center;
            color: #aaa;
            font-size: 0.95rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            z-index: 999;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--primary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .hero-subtitle {
                font-size: 1.1rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .navbar {
                padding: 0.8rem 0;
            }
        }
        @media (max-width: 576px) {
            .hero-section {
                padding: 150px 0 100px;
            }
            .hero-title {
                font-size: 2rem;
            }
            .btn-primary-custom {
                padding: 12px 24px;
            }
        }