body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: #333; background: #f5f5f5; margin: 0; padding: 0; }
        .container { max-width: 1200px; margin: 0 auto; padding: 20px; }
        header { background: #1a365d; color: white; padding: 15px 0; position: sticky; top: 0; z-index: 100; }
        .logo { font-size: 28px; font-weight: bold; text-align: center; }
        .nav { display: flex; justify-content: center; margin-top: 10px; }
        .nav a { color: white; margin: 0 15px; text-decoration: none; }
        .mobile-nav-btn { display: none; position: absolute; right: 20px; top: 15px; }
        h1 { color: #1a365d; border-bottom: 3px solid #e2e8f0; padding-bottom: 10px; }
        h2 { color: #2c5282; margin-top: 30px; }
        h3 { color: #3182ce; }
        .btn { display: inline-block; background: #4299e1; color: white; padding: 10px 20px; margin: 10px 0; border-radius: 5px; text-decoration: none; }
        .img-container { text-align: center; margin: 20px 0; }
        img { max-width: 100%; height: auto; border-radius: 8px; }
        footer { background: #1a365d; color: white; text-align: center; padding: 20px; margin-top: 40px; }
        @media (max-width: 768px) {
            .nav { display: none; flex-direction: column; align-items: center; }
            .nav.active { display: flex; }
            .mobile-nav-btn { display: block; }
        }