:root {
            --primary-color: #0056b3;
            --secondary-color: #28a745;
            --accent-color: #ffc107;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
        }
        body {
            font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
            color: #333;
            line-height: 1.6;
        }
        .navbar-brand {
            font-weight: bold;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            transition: color 0.3s ease;
        }
        .navbar-nav .nav-link:hover {
            color: var(--secondary-color) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 84, 179, 0.85), rgba(40, 167, 69, 0.8)), url('https://images.unsplash.com/photo-1586773860418-dc22f8b874bc?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            padding: 120px 0;
        }
        .hero-section h1 {
            font-size: 3.5rem;
            font-weight: bold;
            text-shadow: 2px 2px 5px rgba(0,0,0,0.5);
        }
        .section-title {
            color: var(--primary-color);
            border-bottom: 3px solid var(--accent-color);
            padding-bottom: 10px;
            margin-bottom: 30px;
            display: inline-block;
        }
        .card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .card-img-top {
            height: 220px;
            object-fit: cover;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            border-radius: 50px;
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.2s;
        }
        .btn-primary:hover {
            background-color: #004494;
            border-color: #004494;
            transform: scale(1.05);
        }
        .icon-box {
            background: var(--light-color);
            border-radius: 50%;
            width: 80px;
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 2rem;
            color: var(--primary-color);
            transition: background 0.3s ease, color 0.3s ease;
        }
        .icon-box:hover {
            background: var(--primary-color);
            color: white;
        }
        footer {
            background: var(--dark-color);
            color: white;
            padding-top: 40px;
        }
        .friendlink {
            background: rgba(255,255,255,0.1);
            border-radius: 10px;
            padding: 20px;
        }
        .flink {
            display: inline-block;
            background: rgba(255,255,255,0.2);
            color: white;
            padding: 8px 15px;
            margin: 5px;
            border-radius: 5px;
            text-decoration: none;
            transition: background 0.3s ease;
        }
        .flink:hover {
            background: var(--secondary-color);
            color: white;
        }
        .contact-info a {
            color: var(--accent-color);
            text-decoration: none;
        }
        .contact-info a:hover {
            text-decoration: underline;
        }
        .sticky-top {
            top: 0;
            z-index: 1020;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 80px 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }