:root {
            --primary-color: #0056b3;
            --secondary-color: #333;
            --accent-color: #ff9900;
            --light-bg: #f8f9fa;
            --dark-text: #212529;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--dark-text);
            overflow-x: hidden;
        }
        header {
            background: linear-gradient(135deg, #1e3c72, #2a5298);
            color: white;
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: bold;
        }
        .nav-link {
            color: white !important;
            font-weight: 500;
            transition: color 0.3s;
        }
        .nav-link:hover {
            color: var(--accent-color) !important;
        }
        .hero-section {
            background: url('https://images.unsplash.com/photo-1581094794329-c8112a89af12?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') no-repeat center center/cover;
            height: 90vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            color: white;
            position: relative;
        }
        .hero-overlay {
            background: rgba(0, 0, 0, 0.6);
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
        }
        .hero-content {
            z-index: 1;
            max-width: 800px;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 40px;
            text-align: center;
            font-weight: bold;
            color: var(--primary-color);
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--accent-color);
        }
        .card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
        }
        .card-img-top {
            height: 220px;
            object-fit: cover;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 28px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: #004494;
            border-color: #004494;
            transform: scale(1.05);
        }
        .flink {
            display: inline-block;
            padding: 8px 16px;
            margin: 5px;
            background: var(--light-bg);
            border-radius: 6px;
            color: var(--secondary-color);
            text-decoration: none;
            transition: all 0.3s;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        friendlink {
            display: block;
            background: #f1f5f9;
            padding: 30px;
            border-radius: 12px;
            margin-top: 40px;
        }
        footer {
            background: var(--secondary-color);
            color: white;
            padding-top: 40px;
        }
        footer a {
            color: #ddd;
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: var(--accent-color);
        }
        .contact-info i {
            color: var(--accent-color);
            margin-right: 10px;
        }
        .sticky-top {
            backdrop-filter: blur(10px);
            background: rgba(30, 60, 114, 0.95);
        }
        .accordion-button:not(.collapsed) {
            background-color: rgba(0, 86, 179, 0.1);
            color: var(--primary-color);
        }
        .map-container {
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
        }
        .testimonial-item {
            background: white;
            border-left: 5px solid var(--accent-color);
            padding: 25px;
            border-radius: 8px;
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.05);
        }
        .product-img {
            border-radius: 12px;
            transition: transform 0.5s;
        }
        .product-img:hover {
            transform: scale(1.03);
        }
        @media (max-width: 768px) {
            .hero-section {
                height: 70vh;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .card-img-top {
                height: 180px;
            }
        }