:root {
            --primary-color: #1e3a8a;
            --secondary-color: #dc2626;
            --accent-color: #f59e0b;
            --light-color: #f8fafc;
            --dark-color: #0f172a;
            --gray-color: #64748b;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.6;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--dark-color);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color) 0%, #1e40af 100%);
            color: white;
            padding: 100px 0;
            position: relative;
            overflow: hidden;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
        }
        .hero-section .lead {
            font-size: 1.25rem;
            opacity: 0.9;
        }
        .feature-icon {
            width: 70px;
            height: 70px;
            background: var(--primary-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: white;
            font-size: 1.8rem;
        }
        .card {
            border: none;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 50px;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            border-radius: 2px;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            border-radius: 50px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: #1e40af;
            border-color: #1e40af;
            transform: scale(1.05);
        }
        .btn-secondary {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            padding: 12px 30px;
            border-radius: 50px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-secondary:hover {
            background-color: #b91c1c;
            border-color: #b91c1c;
            transform: scale(1.05);
        }
        .news-card img {
            height: 200px;
            object-fit: cover;
            border-top-left-radius: 15px;
            border-top-right-radius: 15px;
        }
        .app-showcase {
            background: var(--light-color);
            border-radius: 20px;
            padding: 40px;
        }
        .flink {
            display: inline-block;
            background: #f1f5f9;
            color: var(--dark-color);
            padding: 10px 20px;
            margin: 5px 10px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s;
            border: 1px solid #e2e8f0;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        footer {
            background: var(--dark-color);
            color: #cbd5e1;
        }
        footer a {
            color: #cbd5e1;
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: white;
        }
        .social-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.1);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-right: 10px;
            transition: all 0.3s;
        }
        .social-icon:hover {
            background: var(--primary-color);
            transform: scale(1.1);
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
        }
        .nav-link {
            font-weight: 500;
            padding: 8px 20px !important;
            border-radius: 50px;
            transition: all 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            background-color: rgba(30, 58, 138, 0.1);
            color: var(--primary-color) !important;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 60px 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }