* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            background: #fff;
            color: #333;
            line-height: 1.6;
        }
        
        .nav {
            background: #7DA5F3;
            padding: 16px 20px;
            display: flex;
            align-items: center;
        }
        
        .nav a {
            display: flex;
            align-items: center;
        }
        
        .nav img {
            width: 40px;
            height: 40px;
            border-radius: 8px;
        }
        
        .container {
            max-width: 1000px;
            margin: 0 auto;
            padding: 60px 20px;
        }
        
        h1 {
            font-size: 48px;
            margin-bottom: 20px;
            color: #333;
        }
        
        .intro {
            font-size: 20px;
            color: #666;
            margin-bottom: 60px;
            line-height: 1.8;
        }
        
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 30px;
            margin-bottom: 60px;
        }
        
        .article-card {
            background: #f8f9fa;
            border-radius: 12px;
            padding: 30px;
            text-decoration: none;
            color: inherit;
            transition: transform 0.2s, box-shadow 0.2s;
            display: block;
        }
        
        .article-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 8px 24px rgba(0,0,0,0.1);
        }
        
        .article-tag {
            display: inline-block;
            background: #7DA5F3;
            color: white;
            padding: 4px 12px;
            border-radius: 4px;
            font-size: 12px;
            font-weight: 600;
            margin-bottom: 15px;
            text-transform: uppercase;
        }
        
        .article-card h2 {
            font-size: 24px;
            margin-bottom: 12px;
            color: #333;
        }
        
        .article-card p {
            font-size: 16px;
            color: #666;
            line-height: 1.6;
        }
        
        .article-date {
            font-size: 14px;
            color: #999;
            margin-bottom: 10px;
        }
        
        .cta-section {
            background: linear-gradient(135deg, #7DA5F3, #9BBEF7);
            color: white;
            padding: 60px 40px;
            border-radius: 16px;
            text-align: center;
        }
        
        .cta-section h2 {
            font-size: 36px;
            margin-bottom: 20px;
        }
        
        .cta-section p {
            font-size: 18px;
            margin-bottom: 30px;
            opacity: 0.95;
        }
        
        .cta-button {
            display: inline-block;
            background: white;
            color: #7DA5F3;
            padding: 16px 40px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            font-size: 17px;
            transition: transform 0.2s;
        }
        
        .cta-button:hover {
            transform: translateY(-2px);
        }
        
        .download-section {
            text-align: center;
            margin-top: 25px;
        }
        
        .app-store-badge {
            display: inline-block;
            margin: 8px;
        }
        
        .app-store-badge img {
            height: 50px;
            width: auto;
            border-radius: 8px;
            box-shadow: none;
            vertical-align: middle;
        }
        
        .app-store-badge img[alt*="App Store"] {
            height: 35px;
        }
        
        /* Featured banner */
        .featured-banner {
            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
            border-bottom: 3px solid #7DA5F3;
        }
        .featured-banner-inner {
            max-width: 1000px;
            margin: 0 auto;
            padding: 20px 20px;
            display: flex;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
        }
        .featured-banner-badge {
            background: #7DA5F3;
            color: white;
            font-size: 11px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            padding: 4px 10px;
            border-radius: 4px;
            white-space: nowrap;
            flex-shrink: 0;
        }
        .featured-banner-text {
            flex: 1;
            min-width: 180px;
        }
        .featured-banner-text strong {
            color: #fff;
            font-size: 16px;
            display: block;
            margin-bottom: 2px;
        }
        .featured-banner-text span {
            color: #aac4f7;
            font-size: 14px;
        }
        .featured-banner-cta {
            background: #7DA5F3;
            color: white;
            padding: 10px 22px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            font-size: 15px;
            white-space: nowrap;
            transition: background 0.2s, transform 0.2s;
            flex-shrink: 0;
        }
        .featured-banner-cta:hover {
            background: #6090e8;
            transform: translateY(-1px);
        }
        @media (max-width: 600px) {
            .featured-banner-inner {
                gap: 12px;
            }
            .featured-banner-text strong {
                font-size: 15px;
            }
        }

        @media (max-width: 768px) {
            h1 {
                font-size: 36px;
            }
            
            .articles-grid {
                grid-template-columns: 1fr;
            }
            
            .cta-section h2 {
                font-size: 28px;
            }
        }