:root {
            --primary-color: #2a6ebb;
            --secondary-color: #f8b600;
            --accent-color: #e63946;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --gray-color: #6c757d;
        }
        body {
            font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
            line-height: 1.7;
            color: #333;
            overflow-x: hidden;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.98) !important;
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
            padding-top: 0.8rem;
            padding-bottom: 0.8rem;
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-brand span {
            color: var(--accent-color);
        }
        .nav-link {
            font-weight: 500;
            margin: 0 0.3rem;
            padding: 0.5rem 1rem !important;
            border-radius: 4px;
            transition: all 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            background-color: var(--primary-color);
            color: white !important;
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(42, 110, 187, 0.85), rgba(42, 110, 187, 0.9)), url('https://images.unsplash.com/photo-1586281380349-632531db7ed4?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') center/cover no-repeat;
            color: white;
            padding: 8rem 0 6rem;
            margin-top: 76px;
        }
        .hero-title {
            font-size: 3.2rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
        }
        .hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 2.5rem;
            opacity: 0.95;
        }
        .btn-primary-custom {
            background-color: var(--secondary-color);
            border: none;
            color: #333;
            padding: 0.8rem 2.5rem;
            font-weight: 600;
            border-radius: 50px;
            transition: all 0.3s;
            box-shadow: 0 4px 15px rgba(248, 182, 0, 0.3);
        }
        .btn-primary-custom:hover {
            background-color: #ffca2c;
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(248, 182, 0, 0.4);
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
            font-weight: 700;
            color: var(--dark-color);
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--secondary-color);
            border-radius: 2px;
        }
        .section-title.text-start:after {
            left: 0;
            transform: none;
        }
        .feature-card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            transition: transform 0.4s, box-shadow 0.4s;
            height: 100%;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        .feature-icon {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--primary-color), #3a86ff);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 1.8rem;
        }
        .product-card {
            border: 1px solid #eee;
            border-radius: 10px;
            overflow: hidden;
            transition: all 0.3s;
            height: 100%;
        }
        .product-card:hover {
            border-color: var(--primary-color);
            box-shadow: 0 10px 25px rgba(42, 110, 187, 0.1);
        }
        .product-img {
            height: 220px;
            object-fit: cover;
            width: 100%;
            transition: transform 0.5s;
        }
        .product-card:hover .product-img {
            transform: scale(1.05);
        }
        .badge-custom {
            background-color: var(--accent-color);
            color: white;
            padding: 0.4rem 1rem;
            border-radius: 50px;
            font-size: 0.85rem;
        }
        .testimonial-card {
            background-color: white;
            border-radius: 12px;
            padding: 2rem;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.06);
            height: 100%;
            border-left: 5px solid var(--primary-color);
        }
        .client-img {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            object-fit: cover;
            border: 3px solid var(--light-color);
        }
        .contact-info-box {
            background-color: white;
            border-radius: 12px;
            padding: 2.5rem 2rem;
            text-align: center;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.06);
            height: 100%;
            transition: transform 0.3s;
            border-top: 4px solid var(--primary-color);
        }
        .contact-info-box:hover {
            transform: translateY(-5px);
        }
        .contact-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
        }
        .form-control-custom {
            border: 1px solid #ddd;
            border-radius: 8px;
            padding: 0.9rem 1.2rem;
            transition: all 0.3s;
        }
        .form-control-custom:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(42, 110, 187, 0.2);
        }
        footer {
            background-color: #2c3e50;
            color: #ecf0f1;
            padding-top: 4rem;
        }
        .footer-links a {
            color: #bdc3c7;
            text-decoration: none;
            transition: color 0.3s;
            display: inline-block;
            margin-bottom: 0.8rem;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 42px;
            height: 42px;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            color: white;
            margin-right: 0.8rem;
            transition: all 0.3s;
        }
        .social-icons a:hover {
            background-color: var(--primary-color);
            transform: translateY(-3px);
        }
        .copyright {
            background-color: rgba(0, 0, 0, 0.2);
            padding: 1.5rem 0;
            margin-top: 3rem;
            font-size: 0.95rem;
        }
        .flink {
            display: inline-block;
            background-color: white;
            color: var(--dark-color);
            padding: 0.6rem 1.5rem;
            margin: 0.5rem;
            border-radius: 50px;
            text-decoration: none;
            border: 1px solid #eee;
            transition: all 0.3s;
            font-weight: 500;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(42, 110, 187, 0.2);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: all 0.4s;
            box-shadow: 0 4px 12px rgba(42, 110, 187, 0.3);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: #1a5ca6;
            transform: translateY(-3px);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 6rem 0 4rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }
        .about-img {
            border-radius: 12px;
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        .stats-box {
            text-align: center;
            padding: 1.5rem;
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        .stats-number {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary-color);
            display: block;
        }
        .stats-label {
            color: var(--gray-color);
            font-size: 1rem;
        }
        .timeline {
            position: relative;
            max-width: 1200px;
            margin: 0 auto;
        }
        .timeline::after {
            content: '';
            position: absolute;
            width: 6px;
            background-color: var(--primary-color);
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -3px;
            border-radius: 3px;
        }
        .timeline-item {
            padding: 10px 40px;
            position: relative;
            width: 50%;
            box-sizing: border-box;
        }
        .timeline-item:nth-child(odd) {
            left: 0;
        }
        .timeline-item:nth-child(even) {
            left: 50%;
        }
        .timeline-content {
            padding: 20px;
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            position: relative;
        }
        .timeline-item:nth-child(odd) .timeline-content::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            right: -10px;
            background-color: white;
            top: 30px;
            transform: rotate(45deg);
            box-shadow: 3px -3px 5px rgba(0, 0, 0, 0.05);
        }
        .timeline-item:nth-child(even) .timeline-content::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            left: -10px;
            background-color: white;
            top: 30px;
            transform: rotate(45deg);
            box-shadow: -3px 3px 5px rgba(0, 0, 0, 0.05);
        }
        .timeline-item::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            background-color: white;
            border: 4px solid var(--primary-color);
            border-radius: 50%;
            top: 30px;
            z-index: 1;
        }
        .timeline-item:nth-child(odd)::after {
            right: -10px;
        }
        .timeline-item:nth-child(even)::after {
            left: -10px;
        }
        @media (max-width: 768px) {
            .timeline::after {
                left: 31px;
            }
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            .timeline-item:nth-child(even) {
                left: 0;
            }
            .timeline-item:nth-child(odd) .timeline-content::after,
            .timeline-item:nth-child(even) .timeline-content::after {
                left: -10px;
                right: auto;
            }
            .timeline-item::after {
                left: 21px;
            }
            .timeline-item:nth-child(even)::after {
                left: 21px;
            }
        }