:root {
            --primary-color: #1a3a5f;
            --secondary-color: #c19a6b;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            line-height: 1.8;
            color: #444;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            color: var(--primary-color);
            font-weight: 700;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.98) !important;
            box-shadow: 0 2px 10px rgba(0,0,0,0.08);
            padding-top: 0.8rem;
            padding-bottom: 0.8rem;
            transition: var(--transition);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .nav-link {
            color: var(--dark-color) !important;
            font-weight: 600;
            margin: 0 0.5rem;
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--secondary-color) !important;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: var(--secondary-color);
            left: 50%;
            bottom: 0;
            transition: var(--transition);
            transform: translateX(-50%);
        }
        .nav-link:hover::after, .nav-link.active::after {
            width: 80%;
        }
        .hero-section {
            background: linear-gradient(rgba(26, 58, 95, 0.85), rgba(26, 58, 95, 0.9)), url('https://images.unsplash.com/photo-1513584684374-8bab748fbf90?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80') no-repeat center center/cover;
            color: white;
            padding: 10rem 0;
            margin-top: 76px;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.3);
        }
        .btn-primary-custom {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            color: white;
            padding: 0.8rem 2.5rem;
            font-weight: 600;
            border-radius: 30px;
            transition: var(--transition);
        }
        .btn-primary-custom:hover {
            background-color: #b0895a;
            border-color: #b0895a;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .section-padding {
            padding: 6rem 0;
        }
        .section-title {
            position: relative;
            margin-bottom: 3rem;
            padding-bottom: 1rem;
        }
        .section-title::after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
        }
        .section-title.text-start::after {
            left: 0;
            transform: none;
        }
        .icon-box {
            width: 80px;
            height: 80px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            font-size: 2rem;
            transition: var(--transition);
        }
        .service-card, .project-card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            transition: var(--transition);
            height: 100%;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .service-card:hover, .project-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .service-card:hover .icon-box {
            background-color: var(--secondary-color);
            transform: rotateY(180deg);
        }
        .project-card img {
            transition: var(--transition);
            height: 250px;
            object-fit: cover;
        }
        .project-card:hover img {
            transform: scale(1.05);
        }
        .project-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(26, 58, 95, 0.85);
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: var(--transition);
        }
        .project-card:hover .project-overlay {
            opacity: 1;
        }
        .team-img {
            height: 300px;
            object-fit: cover;
            border-top-left-radius: 10px;
            border-top-right-radius: 10px;
        }
        .testimonial-slider .carousel-item {
            padding: 3rem;
            background-color: var(--light-color);
            border-radius: 10px;
        }
        .testimonial-img {
            width: 100px;
            height: 100px;
            border-radius: 50%;
            object-fit: cover;
            border: 5px solid white;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .contact-info-box {
            background: var(--primary-color);
            color: white;
            padding: 2.5rem;
            border-radius: 10px;
            height: 100%;
        }
        .contact-info-box i {
            font-size: 2.5rem;
            color: var(--secondary-color);
            margin-bottom: 1.5rem;
        }
        .form-control-custom {
            border: 1px solid #ddd;
            border-radius: 5px;
            padding: 0.8rem 1rem;
            margin-bottom: 1.5rem;
            transition: var(--transition);
        }
        .form-control-custom:focus {
            border-color: var(--secondary-color);
            box-shadow: 0 0 0 0.25rem rgba(193, 154, 107, 0.25);
        }
        footer {
            background-color: var(--primary-color);
            color: rgba(255,255,255,0.8);
        }
        footer a {
            color: rgba(255,255,255,0.8);
            text-decoration: none;
            transition: var(--transition);
        }
        footer a:hover {
            color: var(--secondary-color);
            padding-left: 5px;
        }
        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            margin-right: 10px;
            transition: var(--transition);
        }
        .social-icons a:hover {
            background: var(--secondary-color);
            transform: translateY(-5px);
        }
        .flink {
            display: inline-block;
            background: rgba(255,255,255,0.05);
            color: rgba(255,255,255,0.7);
            padding: 0.5rem 1.5rem;
            margin: 0.5rem;
            border-radius: 30px;
            text-decoration: none;
            transition: var(--transition);
            border: 1px solid rgba(255,255,255,0.1);
        }
        .flink:hover {
            background: var(--secondary-color);
            color: white;
            border-color: var(--secondary-color);
            transform: translateY(-3px);
        }
        .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;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            text-decoration: none;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--primary-color);
            color: white;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 6rem 0;
            }
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .section-padding {
                padding: 3rem 0;
            }
        }