body {
            font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f8f9fa;
        }
        header {
            background: linear-gradient(135deg, #1e3c72, #2a5298);
            color: white;
        }
        .navbar-brand {
            font-weight: bold;
            font-size: 1.8rem;
        }
        .hero-section {
            background: url('https://images.unsplash.com/photo-1556056504-5c7696c4c28d?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80') center/cover no-repeat;
            padding: 120px 0;
            color: white;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.7);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 40px;
            text-align: center;
            font-weight: bold;
            color: #1e3c72;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: #2a5298;
            border-radius: 2px;
        }
        .feature-card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            transition: transform 0.3s, box-shadow 0.3s;
            background: white;
            height: 100%;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .feature-icon {
            font-size: 3rem;
            color: #2a5298;
            margin-bottom: 20px;
        }
        .download-btn {
            background: linear-gradient(to right, #ff7e5f, #feb47b);
            border: none;
            padding: 15px 40px;
            font-size: 1.2rem;
            border-radius: 50px;
            transition: all 0.3s;
        }
        .download-btn:hover {
            background: linear-gradient(to right, #feb47b, #ff7e5f);
            transform: scale(1.05);
        }
        .news-card {
            border-left: 5px solid #2a5298;
            padding-left: 20px;
            margin-bottom: 30px;
            transition: background 0.3s;
        }
        .news-card:hover {
            background: #e9f0ff;
        }
        .friendlink {
            background: #eef2f7;
            padding: 50px 0;
        }
        .flink {
            display: inline-block;
            margin: 10px 20px;
            padding: 10px 20px;
            background: white;
            border-radius: 10px;
            text-decoration: none;
            color: #1e3c72;
            font-weight: 500;
            transition: all 0.3s;
            border: 2px solid transparent;
        }
        .flink:hover {
            border-color: #2a5298;
            color: #ff7e5f;
            transform: translateY(-3px);
        }
        footer {
            background: #1a1a2e;
            color: #ccc;
        }
        .social-icon {
            font-size: 1.5rem;
            margin: 0 10px;
            color: #aaa;
            transition: color 0.3s;
        }
        .social-icon:hover {
            color: #ff7e5f;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 80px 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }