:root {
            --primary-color: #1e3a8a;
            --secondary-color: #3b82f6;
            --accent-color: #f59e0b;
            --light-color: #f8fafc;
            --dark-color: #0f172a;
            --gray-color: #64748b;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: #333;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            color: var(--primary-color) !important;
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
            color: white;
            padding: 100px 0;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            width: 300px;
            height: 300px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            top: -100px;
            right: -100px;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            width: 200px;
            height: 200px;
            background: rgba(255,255,255,0.05);
            border-radius: 50%;
            bottom: -80px;
            left: -80px;
        }
        .section-title {
            color: var(--primary-color);
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 30px;
            font-weight: 700;
        }
        .section-title::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 60px;
            height: 4px;
            background: var(--accent-color);
        }
        .text-center .section-title::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .feature-card {
            transition: all 0.3s ease;
            border: none;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            height: 100%;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .feature-icon {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: white;
            font-size: 30px;
        }
        .app-showcase {
            background: var(--light-color);
            padding: 80px 0;
        }
        .app-card {
            background: white;
            border-radius: 12px;
            padding: 25px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: all 0.3s ease;
            height: 100%;
            border: 1px solid #e2e8f0;
        }
        .app-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .app-rating {
            color: var(--accent-color);
        }
        .btn-primary-custom {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border: none;
            padding: 12px 30px;
            border-radius: 30px;
            font-weight: 600;
            color: white;
            transition: all 0.3s ease;
        }
        .btn-primary-custom:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(59, 130, 246, 0.3);
            color: white;
        }
        .testimonial-slide {
            background: white;
            border-radius: 12px;
            padding: 30px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            margin: 15px;
        }
        .testimonial-avatar {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            object-fit: cover;
            border: 3px solid var(--secondary-color);
        }
        .news-card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: all 0.3s ease;
            height: 100%;
        }
        .news-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .news-date {
            background: var(--primary-color);
            color: white;
            padding: 8px 15px;
            border-radius: 20px;
            font-size: 14px;
            display: inline-block;
            margin-bottom: 15px;
        }
        .footer {
            background: var(--dark-color);
            color: white;
            padding: 60px 0 20px;
        }
        .footer a {
            color: #cbd5e1;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer a:hover {
            color: white;
        }
        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255,255,255,0.1);
            margin-right: 10px;
            transition: all 0.3s;
        }
        .social-icons a:hover {
            background: var(--secondary-color);
            transform: translateY(-3px);
        }
        .friendlink {
            padding: 40px 0;
            background: #f1f5f9;
        }
        .flink {
            display: inline-block;
            padding: 8px 20px;
            margin: 5px 10px;
            background: white;
            border-radius: 30px;
            color: var(--gray-color);
            text-decoration: none;
            border: 1px solid #e2e8f0;
            transition: all 0.3s;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-3px);
        }
        .copyright {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 20px;
            margin-top: 40px;
            font-size: 14px;
            color: #94a3b8;
        }
        .stats-number {
            font-size: 48px;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 5px;
        }
        .stats-label {
            color: var(--gray-color);
            font-size: 18px;
        }
        .stats-section {
            padding: 60px 0;
            background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 60px 0;
                text-align: center;
            }
            .hero-section h1 {
                font-size: 32px;
            }
            .section-title {
                font-size: 28px;
            }
            .stats-number {
                font-size: 36px;
            }
        }
        .form-control-custom {
            border-radius: 30px;
            padding: 12px 20px;
            border: 1px solid #cbd5e1;
        }
        .form-control-custom:focus {
            border-color: var(--secondary-color);
            box-shadow: 0 0 0 0.25rem rgba(59, 130, 246, 0.25);
        }