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

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

        #main-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, #4a90e2 0%, #357abd 100%);
            padding: 2rem;
            color: white;
        }

        #header h1 {
            font-size: 2.5rem;
            font-weight: 300;
            margin: 0;
            text-align: center;
        }

        #nav-holder {
            background-color: #2c5f8d;
            padding: 0;
        }

        #nav {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            padding: 0;
            margin: 0;
        }

        #nav li {
            margin: 0;
        }

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

        #nav li a:hover {
            background-color: #4a90e2;
        }

        #content-holder {
            padding: 3rem 2rem;
        }

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

        article h2 {
            color: #2c5f8d;
            margin: 2rem 0 1rem;
            font-size: 1.8rem;
            border-bottom: 3px solid #4a90e2;
            padding-bottom: 0.5rem;
        }

        article h3 {
            color: #357abd;
            margin: 1.5rem 0 0.8rem;
            font-size: 1.4rem;
        }

        article h4 {
            color: #4a90e2;
            margin: 1.2rem 0 0.6rem;
            font-size: 1.2rem;
        }

        article p {
            margin-bottom: 1.2rem;
            text-align: justify;
        }

        #transition-section {
            max-width: 900px;
            margin: 0 auto 3rem;
            padding: 2rem;
            background-color: #f9f9f9;
            border-left: 4px solid #4a90e2;
        }

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

        #links-section {
            max-width: 900px;
            margin: 0 auto;
            padding: 2rem;
            background-color: #fef9e7;
            border-radius: 8px;
            border: 2px solid #f7dc6f;
        }

        #links-section h2 {
            color: #2c5f8d;
            margin-bottom: 2rem;
            text-align: center;
            font-size: 2rem;
        }

        #links-section h3 {
            color: #357abd;
            margin: 2rem 0 1rem;
            font-size: 1.5rem;
            border-bottom: 2px solid #4a90e2;
            padding-bottom: 0.5rem;
        }

        #links-section ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 0.8rem 2rem;
            margin-bottom: 2rem;
        }

        #links-section ul li {
            padding: 0.5rem 0;
        }

        #links-section ul li a {
            color: #2c5f8d;
            text-decoration: none;
            transition: color 0.3s ease;
            font-weight: 500;
            display: inline-block;
            position: relative;
        }

        #links-section ul li a:before {
            content: "→ ";
            color: #4a90e2;
            font-weight: bold;
        }

        #links-section ul li a:hover {
            color: #4a90e2;
            padding-left: 5px;
        }

        #footer {
            background-color: #2c5f8d;
            color: white;
            padding: 2rem;
            text-align: center;
            margin-top: 3rem;
        }

        #footer a {
            color: #f7dc6f;
            text-decoration: none;
        }

        #footer a:hover {
            text-decoration: underline;
        }

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

            #nav {
                flex-direction: column;
            }

            #nav li {
                width: 100%;
                border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            }

            #nav li a {
                padding: 0.8rem 1rem;
            }

            #content-holder {
                padding: 2rem 1rem;
            }

            article h2 {
                font-size: 1.5rem;
            }

            article h3 {
                font-size: 1.2rem;
            }

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

            #transition-section {
                padding: 1.5rem;
            }

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

        @media (max-width: 480px) {
            #header h1 {
                font-size: 1.5rem;
            }

            #header {
                padding: 1.5rem 1rem;
            }

            article p {
                text-align: left;
            }
        }