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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #f5f5f5;
            color: #333;
            line-height: 1.6;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            background-color: #fff;
            box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
        }

        header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: #fff;
            padding: 2rem 2rem 1.5rem;
            text-align: center;
        }

        h1 {
            font-size: 2.5rem;
            margin-bottom: 0.5rem;
            font-weight: 700;
            letter-spacing: 2px;
        }

        .subtitle {
            font-size: 1rem;
            opacity: 0.95;
            line-height: 1.4;
            max-width: 800px;
            margin: 0 auto;
        }

        .subtitle .bf {
            font-weight: 700;
            font-size: 1.1em;
        }

        nav {
            background-color: #4a5568;
            padding: 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
        }

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

        nav ul li {
            margin: 0;
        }

        nav ul li a {
            display: block;
            padding: 1rem 1.5rem;
            color: #fff;
            text-decoration: none;
            transition: background-color 0.3s ease;
            font-weight: 500;
        }

        nav ul li a:hover {
            background-color: #667eea;
        }

        main {
            padding: 3rem 2rem;
        }

        article {
            max-width: 900px;
            margin: 0 auto 3rem;
        }

        article h2,
        article h3,
        article h4 {
            color: #667eea;
            margin-top: 2rem;
            margin-bottom: 1rem;
        }

        article h2 {
            font-size: 2rem;
            border-bottom: 3px solid #667eea;
            padding-bottom: 0.5rem;
        }

        article h3 {
            font-size: 1.6rem;
        }

        article h4 {
            font-size: 1.3rem;
        }

        article p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }

        article a {
            color: #667eea;
            text-decoration: none;
            border-bottom: 1px solid #667eea;
            transition: color 0.3s ease;
        }

        article a:hover {
            color: #764ba2;
            border-bottom-color: #764ba2;
        }

        article strong,
        article b {
            color: #4a5568;
        }

        .transition-section {
            max-width: 900px;
            margin: 0 auto 3rem;
            padding: 2rem;
            background-color: #f7fafc;
            border-left: 4px solid #667eea;
            border-radius: 4px;
        }

        .transition-section p {
            margin-bottom: 1rem;
        }

        .transition-section p:last-child {
            margin-bottom: 0;
        }

        .links-section {
            max-width: 900px;
            margin: 0 auto;
            padding: 2rem;
            background-color: #edf2f7;
            border-radius: 8px;
        }

        .links-section h3 {
            color: #4a5568;
            font-size: 1.4rem;
            margin-bottom: 1rem;
            margin-top: 2rem;
        }

        .links-section h3:first-child {
            margin-top: 0;
        }

        .links-section ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 0.5rem 2rem;
            margin-bottom: 1.5rem;
        }

        .links-section ul li {
            margin-bottom: 0.5rem;
        }

        .links-section ul li a {
            color: #667eea;
            text-decoration: none;
            transition: color 0.3s ease, padding-left 0.3s ease;
            display: inline-block;
            position: relative;
            padding-left: 1.2rem;
        }

        .links-section ul li a:before {
            content: "→";
            position: absolute;
            left: 0;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .links-section ul li a:hover {
            color: #764ba2;
            padding-left: 1.5rem;
        }

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

        footer {
            background-color: #2d3748;
            color: #fff;
            padding: 2rem;
            text-align: center;
            margin-top: 3rem;
        }

        @media (max-width: 768px) {
            h1 {
                font-size: 1.8rem;
            }

            .subtitle {
                font-size: 0.9rem;
            }

            nav ul {
                flex-direction: column;
            }

            nav ul li a {
                padding: 0.8rem 1rem;
                border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            }

            main {
                padding: 2rem 1rem;
            }

            article h2 {
                font-size: 1.6rem;
            }

            article h3 {
                font-size: 1.3rem;
            }

            article h4 {
                font-size: 1.1rem;
            }

            .links-section ul {
                grid-template-columns: 1fr;
                gap: 0.5rem;
            }

            .transition-section {
                padding: 1.5rem;
            }

            .links-section {
                padding: 1.5rem;
            }
        }

        @media (max-width: 480px) {
            h1 {
                font-size: 1.5rem;
                letter-spacing: 1px;
            }

            header {
                padding: 1.5rem 1rem;
            }

            article p {
                text-align: left;
            }
        }