:root {
            --primary-color: #1a365d;
            --secondary-color: #e63946;
            --accent-color: #2a9d8f;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --text-color: #333;
            --border-radius: 8px;
            --box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--text-color);
            line-height: 1.6;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            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;
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .section-padding {
            padding: 80px 0;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding: 50px 0;
            }
        }
        .navbar {
            background-color: rgba(26, 54, 93, 0.95);
            padding: 15px 0;
            transition: var(--transition);
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 800;
            color: white !important;
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .navbar-nav .nav-link {
            color: rgba(255,255,255,0.85) !important;
            font-weight: 500;
            padding: 8px 15px !important;
            margin: 0 5px;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            color: white !important;
            background-color: rgba(255,255,255,0.1);
            transform: translateY(-2px);
        }
        .navbar-toggler {
            border: 1px solid rgba(255,255,255,0.3);
            padding: 5px 10px;
        }
        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.8%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }
        .hero-carousel {
            height: 90vh;
            min-height: 600px;
            overflow: hidden;
        }
        .carousel-item {
            height: 90vh;
            min-height: 600px;
        }
        .carousel-item img {
            object-fit: cover;
            height: 100%;
            width: 100%;
        }
        .carousel-caption {
            bottom: 30%;
            background: rgba(26, 54, 93, 0.75);
            padding: 30px;
            border-radius: var(--border-radius);
            text-align: left;
            max-width: 700px;
            margin: 0 auto;
        }
        .carousel-caption h2 {
            font-size: 2.8rem;
            color: white;
            margin-bottom: 20px;
        }
        .carousel-caption p {
            font-size: 1.2rem;
            margin-bottom: 25px;
        }
        @media (max-width: 992px) {
            .hero-carousel, .carousel-item {
                height: 70vh;
                min-height: 500px;
            }
            .carousel-caption {
                bottom: 20%;
                padding: 20px;
            }
            .carousel-caption h2 {
                font-size: 2rem;
            }
        }
        @media (max-width: 576px) {
            .hero-carousel, .carousel-item {
                height: 60vh;
                min-height: 400px;
            }
            .carousel-caption {
                bottom: 10%;
                padding: 15px;
            }
            .carousel-caption h2 {
                font-size: 1.5rem;
            }
            .carousel-caption p {
                font-size: 1rem;
                margin-bottom: 15px;
            }
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            font-weight: 600;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #142a4a;
            border-color: #142a4a;
            transform: translateY(-3px);
            box-shadow: var(--box-shadow);
        }
        .btn-secondary {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            padding: 12px 30px;
            font-weight: 600;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .btn-secondary:hover {
            background-color: #c1121f;
            border-color: #c1121f;
            transform: translateY(-3px);
            box-shadow: var(--box-shadow);
        }
        .card {
            border: none;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-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;
            margin-bottom: 15px;
        }
        .feature-icon {
            width: 70px;
            height: 70px;
            background-color: rgba(42, 157, 143, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            color: var(--accent-color);
            font-size: 30px;
        }
        .feature-item {
            text-align: center;
            padding: 30px 20px;
            border-radius: var(--border-radius);
            transition: var(--transition);
            height: 100%;
        }
        .feature-item:hover {
            background-color: rgba(26, 54, 93, 0.03);
            transform: translateY(-5px);
        }
        .product-card {
            position: relative;
            overflow: hidden;
            border-radius: var(--border-radius);
            margin-bottom: 30px;
        }
        .product-img {
            height: 300px;
            width: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .product-card:hover .product-img {
            transform: scale(1.05);
        }
        .product-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
            color: white;
            padding: 30px 20px 20px;
            transform: translateY(100%);
            transition: transform 0.5s ease;
        }
        .product-card:hover .product-overlay {
            transform: translateY(0);
        }
        .stats-section {
            background: linear-gradient(rgba(26, 54, 93, 0.9), rgba(26, 54, 93, 0.9)), url('https://images.unsplash.com/photo-1516321497487-e288fb19713f?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            color: white;
        }
        .stat-item {
            text-align: center;
            padding: 30px 20px;
        }
        .stat-number {
            font-size: 3.5rem;
            font-weight: 800;
            color: var(--secondary-color);
            margin-bottom: 10px;
        }
        .stat-text {
            font-size: 1.2rem;
            font-weight: 600;
        }
        .contact-info-item {
            display: flex;
            align-items: flex-start;
            margin-bottom: 25px;
        }
        .contact-icon {
            width: 50px;
            height: 50px;
            background-color: rgba(42, 157, 143, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-color);
            font-size: 22px;
            margin-right: 20px;
            flex-shrink: 0;
        }
        .contact-form .form-control {
            padding: 12px 15px;
            border-radius: var(--border-radius);
            border: 1px solid #ddd;
            margin-bottom: 20px;
        }
        .contact-form .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(26, 54, 93, 0.25);
        }
        .friendlink {
            background-color: #f8f9fa;
            padding: 60px 0;
        }
        .flink {
            display: inline-block;
            background-color: white;
            padding: 12px 25px;
            margin: 8px;
            border-radius: var(--border-radius);
            color: var(--primary-color);
            font-weight: 500;
            transition: var(--transition);
            border: 1px solid #eaeaea;
            text-decoration: none;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            box-shadow: var(--box-shadow);
            text-decoration: none;
        }
        footer {
            background-color: var(--primary-color);
            color: rgba(255,255,255,0.85);
            padding-top: 70px;
        }
        .footer-links h5 {
            color: white;
            margin-bottom: 25px;
            font-size: 1.2rem;
        }
        .footer-links ul {
            list-style: none;
            padding-left: 0;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: rgba(255,255,255,0.7);
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .copyright {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding: 20px 0;
            margin-top: 50px;
            text-align: center;
            font-size: 0.9rem;
            color: rgba(255,255,255,0.6);
        }
        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background-color: rgba(255,255,255,0.1);
            border-radius: 50%;
            color: white;
            margin-right: 10px;
            transition: var(--transition);
        }
        .social-icons a:hover {
            background-color: var(--secondary-color);
            transform: translateY(-3px);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            z-index: 1000;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--primary-color);
            transform: translateY(-5px);
        }
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.8s ease, transform 0.8s ease;
        }
        .fade-in.visible {
            opacity: 1;
            transform: translateY(0);
        }