* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            font-size: 16px;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #ffffff;
        }

        .main-header {
            background-color: #f8f8f8;
            border-bottom: 2px solid #e0e0e0;
            padding: 1.5rem 0;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .header-content {
            text-align: center;
        }

        .header-logo-text {
            font-size: 2.5rem;
            font-weight: 700;
            color: #2c3e50;
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 0.5rem;
        }

        .header-subtitle {
            font-size: 1rem;
            color: #7f8c8d;
            font-weight: 300;
        }

        nav {
            background-color: #34495e;
            padding: 1rem 0;
            margin-bottom: 2rem;
        }

        nav ul {
            list-style: none;
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 2rem;
        }

        nav a {
            color: #ecf0f1;
            text-decoration: none;
            font-weight: 500;
            text-transform: uppercase;
            font-size: 0.9rem;
            letter-spacing: 1px;
            transition: color 0.3s ease;
        }

        nav a:hover {
            color: #3498db;
        }

        .sub-header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 2rem 0;
            text-align: center;
            margin-bottom: 3rem;
        }

        .sub-heading-title {
            font-size: 1.5rem;
            font-weight: 300;
            margin: 0;
        }

        .sub-heading-title strong {
            font-weight: 700;
        }

        h1 {
            font-size: 2.5rem;
            color: #2c3e50;
            margin-bottom: 2rem;
            font-weight: 700;
            line-height: 1.2;
        }

        article {
            max-width: 800px;
            margin: 0 auto 3rem;
            padding: 0 20px;
        }

        article h2 {
            font-size: 2rem;
            color: #34495e;
            margin-top: 2rem;
            margin-bottom: 1rem;
            font-weight: 600;
        }

        article h3 {
            font-size: 1.5rem;
            color: #34495e;
            margin-top: 1.5rem;
            margin-bottom: 0.75rem;
            font-weight: 600;
        }

        article h4 {
            font-size: 1.25rem;
            color: #34495e;
            margin-top: 1.25rem;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }

        article p {
            margin-bottom: 1.25rem;
            color: #555;
            font-size: 1.05rem;
            line-height: 1.8;
        }

        .transition-section {
            max-width: 800px;
            margin: 0 auto 3rem;
            padding: 0 20px;
        }

        .transition-section p {
            margin-bottom: 1.25rem;
            color: #555;
            font-size: 1.05rem;
            line-height: 1.8;
        }

        .links-section {
            background-color: #f9f9f9;
            padding: 3rem 0;
            border-top: 3px solid #e0e0e0;
            border-bottom: 3px solid #e0e0e0;
        }

        .links-section h3 {
            font-size: 1.75rem;
            color: #2c3e50;
            margin-bottom: 1.5rem;
            font-weight: 600;
            padding: 0 20px;
        }

        .links-section ul {
            list-style: none;
            column-count: 2;
            column-gap: 2rem;
            padding: 0 20px;
        }

        .links-section li {
            margin-bottom: 0.75rem;
            break-inside: avoid;
        }

        .links-section a {
            color: #3498db;
            text-decoration: none;
            font-size: 1rem;
            transition: color 0.3s ease, padding-left 0.3s ease;
            display: inline-block;
        }

        .links-section a:hover {
            color: #2980b9;
            padding-left: 5px;
        }

        .links-section a::before {
            content: "→ ";
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .links-section a:hover::before {
            opacity: 1;
        }

        footer {
            background-color: #2c3e50;
            color: #ecf0f1;
            padding: 2rem 0;
            text-align: center;
            margin-top: 3rem;
        }

        @media (max-width: 768px) {
            .header-logo-text {
                font-size: 2rem;
            }

            nav ul {
                flex-direction: column;
                gap: 1rem;
                align-items: center;
            }

            h1 {
                font-size: 2rem;
            }

            article h2 {
                font-size: 1.75rem;
            }

            article h3 {
                font-size: 1.35rem;
            }

            .sub-heading-title {
                font-size: 1.25rem;
            }

            .links-section ul {
                column-count: 1;
            }
        }

        @media (max-width: 480px) {
            .header-logo-text {
                font-size: 1.5rem;
                letter-spacing: 1px;
            }

            h1 {
                font-size: 1.75rem;
            }

            article p,
            .transition-section p {
                font-size: 1rem;
            }
        }