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

    body {
        font-family: 'Roboto', sans-serif;
        background: linear-gradient(135deg, #1a1a2e, #16213e);
        color: #f0f0f0;
        line-height: 1.6;
        overflow-x: hidden;
    }

    a {
        color: #4CAF50;
        text-decoration: none;
        transition: color 0.3s ease;
    }

    a:hover {
        color: #FF9800;
    }

    /* Layout */
    .container {
        display: flex;
        min-height: 100vh;
    }

    .sidebar {
        width: 25%;
        background-color: #0f3460;
        padding: 20px;
        display: flex;
        flex-direction: column;
        gap: 10px;
        position: fixed;
        height: 100%;
        overflow-y: auto;
    }

    .sidebar .logo {
        font-size: 1.5em;
        font-weight: bold;
        color: #fff;
        margin-bottom: 20px;
        text-align: center;
    }

    .tab-menu {
        display: flex;
        flex-direction: column;
    }

    .tab-item {
        padding: 15px;
        background: linear-gradient(45deg, #0f3460, #16213e);
        margin-bottom: 10px;
        border-radius: 8px;
        cursor: pointer;
        transition: background 0.3s ease, transform 0.3s ease;
        box-shadow: 0 4px 6px rgba(0,0,0,0.3);
    }

    .tab-item:hover {
        background: linear-gradient(45deg, #16213e, #0f3460);
        transform: translateY(-2px);
    }

    .tab-item.active {
        background: linear-gradient(45deg, #4CAF50, #81C784);
        font-weight: bold;
        box-shadow: 0 6px 8px rgba(0,0,0,0.4);
    }

    .main-content {
        margin-left: 25%;
        padding: 40px;
        width: 75%;
        background: linear-gradient(135deg, #1a1a2e, #16213e);
        min-height: 100vh;
        animation: fadeIn 1s ease-in-out;
    }

    @keyframes fadeIn {
        from { opacity: 0; }
        to { opacity: 1; }
    }

    /* Article Styles */
    article {
        max-width: 800px;
        margin: 0 auto;
    }

    article h2, article h3, article h4 {
        color: #FF9800;
        margin-bottom: 15px;
        position: relative;
        padding-bottom: 10px;
    }

    article h2::after, article h3::after, article h4::after {
        content: '';
        position: absolute;
        width: 50px;
        height: 3px;
        background: #4CAF50;
        bottom: 0;
        left: 0;
        border-radius: 2px;
    }

    article p, article ul, article table {
        margin-bottom: 20px;
    }

    article pre {
        background: #0f3460;
        padding: 15px;
        border-radius: 8px;
        overflow-x: auto;
        box-shadow: inset 0 0 10px rgba(0,0,0,0.5);
    }

    article code {
        color: #81C784;
        font-family: 'Courier New', Courier, monospace;
    }

    table {
        width: 100%;
        border-collapse: collapse;
    }

    table, th, td {
        border: 1px solid #4CAF50;
    }

    th, td {
        padding: 10px;
        text-align: left;
    }

    th {
        background: #333;
    }

    /* Sample Data Section */
    .sample-data {
        background: rgba(255, 152, 0, 0.1);
        padding: 20px;
        border-left: 5px solid #FF9800;
        margin-bottom: 20px;
        border-radius: 5px;
    }

    .sample-data ul {
        list-style: disc inside;
        margin-left: 20px;
    }

    /* Decorative Elements */
    .decorative-line {
        height: 2px;
        background: linear-gradient(to right, #4CAF50, #81C784, #4CAF50);
        margin: 40px 0;
        border: none;
    }

    .image-gallery {
        display: flex;
        flex-wrap: wrap;
        gap: 15px;
        margin-bottom: 20px;
    }

    .image-gallery img {
        width: 100%;
        max-width: 320px;
        border-radius: 10px;
        box-shadow: 0 4px 8px rgba(0,0,0,0.3);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .image-gallery img:hover {
        transform: scale(1.05);
        box-shadow: 0 6px 12px rgba(0,0,0,0.5);
    }

    /* Footer */
    .footer {
        text-align: center;
        padding: 20px;
        font-size: 0.9em;
        color: #aaa;
    }

    /* Responsive Design */
    @media (max-width: 1200px) {
        .sidebar {
            width: 20%;
        }

        .main-content {
            margin-left: 20%;
            width: 80%;
        }
    }

    @media (max-width: 992px) {
        .sidebar {
            width: 100%;
            position: relative;
            flex-direction: row;
            overflow-x: auto;
        }

        .tab-menu {
            flex-direction: row;
        }

        .tab-item {
            flex: 1;
            text-align: center;
            margin-bottom: 0;
            border-bottom: none;
            border-right: 1px solid #555;
        }

        .main-content {
            margin-left: 0;
            width: 100%;
            padding: 20px;
        }
    }

    @media (max-width: 768px) {
        .sidebar {
            padding: 10px;
        }

        .tab-item {
            padding: 10px;
            font-size: 0.9em;
        }

        .main-content {
            padding: 10px;
        }

        article {
            max-width: 100%;
        }

        .image-gallery {
            flex-direction: column;
            align-items: center;
        }
    }

    @media (max-width: 480px) {
        .tab-item {
            padding: 8px;
            font-size: 0.8em;
        }

        article h2 {
            font-size: 1.5em;
        }

        article h3 {
            font-size: 1.2em;
        }

        article p, article ul, article table {
            font-size: 0.9em;
        }
    }

    /* Highlight Prompt */
    .prompt-note {
        background: rgba(76, 175, 80, 0.1);
        padding: 15px;
        border-left: 5px solid #4CAF50;
        border-radius: 5px;
        margin-bottom: 30px;
        font-style: italic;
    }