/* CSS Variables for Dark and Light Modes */
    :root {
        --bg-color-dark: #1E1E1E;
        --bg-color-light: #F5F5F5;
        --text-color-dark: #FFFFFF;
        --text-color-light: #333333;
        --accent-color-dark: #00BFFF;
        --accent-color-light: #4CAF50;
        --secondary-color-dark: #9C27B0;
        --secondary-color-light: #03A9F4;
        --font-primary: 'Roboto', sans-serif;
        --font-secondary: 'Montserrat', sans-serif;
        --card-bg-dark: #0D0D0D;
        --card-bg-light: #FFFFFF;
        --border-color-dark: #333333;
        --border-color-light: #DDDDDD;
    }

    /* Global Styles */
    body {
        margin: 0;
        padding: 0;
        background: radial-gradient(circle, rgba(30,30,30,1) 0%, rgba(13,13,13,1) 100%);
        color: var(--text-color-dark);
        font-family: var(--font-primary);
        transition: background-color 0.5s, color 0.5s;
    }

    /* Dark Mode by Default */
    body.light-mode {
        background: radial-gradient(circle, rgba(245,245,245,1) 0%, rgba(255,255,255,1) 100%);
        color: var(--text-color-light);
    }

    /* Navigation Bar */
    .navbar {
        position: fixed;
        top: 0;
        width: 100%;
        height: 60px;
        background-color: rgba(0, 0, 0, 0.8);
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0 20px;
        z-index: 1000;
        backdrop-filter: blur(10px);
    }

    .navbar.light-mode {
        background-color: rgba(255, 255, 255, 0.9);
    }

    .navbar .logo {
        font-family: var(--font-secondary);
        font-size: 1.5em;
        color: var(--accent-color-dark);
    }

    .navbar.light-mode .logo {
        color: var(--accent-color-light);
    }

    .navbar .toggle-theme {
        cursor: pointer;
        font-size: 1.2em;
        color: var(--accent-color-dark);
    }

    .navbar.light-mode .toggle-theme {
        color: var(--accent-color-light);
    }

    /* Sidebar */
    .sidebar {
        position: fixed;
        top: 60px;
        left: 0;
        width: 200px;
        height: calc(100% - 60px);
        background-color: var(--bg-color-dark);
        padding-top: 20px;
        transition: background-color 0.5s;
    }

    .sidebar.light-mode {
        background-color: var(--bg-color-light);
        box-shadow: 2px 0 5px rgba(0,0,0,0.1);
    }

    .sidebar a {
        display: block;
        padding: 15px 20px;
        color: var(--text-color-dark);
        text-decoration: none;
        font-family: var(--font-secondary);
        transition: background 0.3s, color 0.3s;
    }

    .sidebar.light-mode a {
        color: var(--text-color-light);
    }

    .sidebar a:hover {
        background-color: var(--accent-color-dark);
        color: #FFFFFF;
    }

    .sidebar.light-mode a:hover {
        background-color: var(--accent-color-light);
        color: #FFFFFF;
    }

    /* Main Content */
    .main-content {
        margin-top: 60px;
        margin-left: 200px;
        padding: 20px;
        transition: margin-left 0.5s;
    }

    .light-mode .main-content {
        margin-left: 200px;
    }

    /* Cards */
    .card {
        background-color: var(--card-bg-dark);
        border: 1px solid var(--border-color-dark);
        border-radius: 8px;
        padding: 20px;
        margin-bottom: 20px;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        transition: background-color 0.5s, border-color 0.5s;
    }

    .light-mode .card {
        background-color: var(--card-bg-light);
        border-color: var(--border-color-light);
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    }

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

    article h2 {
        font-family: var(--font-secondary);
        font-size: 2em;
        margin-bottom: 10px;
        color: var(--accent-color-dark);
    }

    .light-mode article h2 {
        color: var(--accent-color-light);
    }

    article h3 {
        font-family: var(--font-secondary);
        font-size: 1.5em;
        margin-top: 20px;
        color: var(--accent-color-dark);
    }

    .light-mode article h3 {
        color: var(--accent-color-light);
    }

    article p {
        line-height: 1.6;
        margin-bottom: 15px;
    }

    article pre {
        background-color: var(--card-bg-dark);
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
        border: 1px solid var(--border-color-dark);
    }

    .light-mode article pre {
        background-color: var(--card-bg-light);
        border-color: var(--border-color-light);
    }

    article code {
        font-family: 'Courier New', Courier, monospace;
        color: var(--accent-color-dark);
    }

    .light-mode article code {
        color: var(--accent-color-light);
    }

    /* Images */
    .image-gallery {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
        margin-top: 20px;
    }

    .image-gallery img {
        width: 100%;
        max-width: 320px;
        border-radius: 5px;
    }

    /* Alerts */
    .alert {
        background: rgba(255, 87, 34, 0.1);
        border-left: 5px solid rgb(255, 87, 34);
        padding: 10px 15px;
        margin-bottom: 20px;
        border-radius: 3px;
    }

    /* Footer */
    .footer {
        text-align: center;
        padding: 20px;
        background-color: rgba(0, 0, 0, 0.8);
        color: var(--text-color-dark);
        position: fixed;
        bottom: 0;
        width: 100%;
        transition: background-color 0.5s;
    }

    .light-mode .footer {
        background-color: rgba(245, 245, 245, 0.9);
        color: var(--text-color-light);
    }

    /* Buttons */
    .btn {
        background-color: var(--accent-color-dark);
        color: #FFFFFF;
        padding: 10px 20px;
        border: none;
        border-radius: 5px;
        cursor: pointer;
        transition: background-color 0.3s, transform 0.3s;
    }

    .light-mode .btn {
        background-color: var(--accent-color-light);
    }

    .btn:hover {
        background-color: var(--secondary-color-dark);
        transform: scale(1.05);
    }

    .light-mode .btn:hover {
        background-color: var(--secondary-color-light);
    }

    /* Animation for Background */
    @keyframes aurora-move {
        0% {
            background-position: 0% 50%;
        }
        50% {
            background-position: 100% 50%;
        }
        100% {
            background-position: 0% 50%;
        }
    }

    body {
        background: radial-gradient(circle, rgba(30,30,30,1) 0%, rgba(13,13,13,1) 100%);
        animation: aurora-move 15s linear infinite;
        background-size: 400% 400%;
    }

    .light-mode {
        animation: none;
    }

    /* Responsive Design */
    @media (max-width: 1440px) {
        .sidebar {
            width: 180px;
        }

        .main-content {
            margin-left: 180px;
        }
    }

    @media (max-width: 1200px) {
        .sidebar {
            width: 160px;
        }

        .main-content {
            margin-left: 160px;
        }
    }

    @media (max-width: 1024px) {
        .sidebar {
            width: 140px;
        }

        .main-content {
            margin-left: 140px;
        }
    }

    @media (max-width: 768px) {
        .sidebar {
            width: 100%;
            height: auto;
            position: relative;
        }

        .main-content {
            margin-left: 0;
        }

        .navbar {
            justify-content: space-between;
        }

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

    @media (max-width: 480px) {
        .navbar .logo {
            font-size: 1.2em;
        }

        .sidebar a {
            padding: 10px 15px;
            font-size: 0.9em;
        }

        article h2 {
            font-size: 1.5em;
        }

        article h3 {
            font-size: 1.2em;
        }

        .btn {
            padding: 8px 16px;
            font-size: 0.9em;
        }
    }

    @media (max-width: 320px) {
        .navbar .logo {
            font-size: 1em;
        }

        .sidebar a {
            padding: 8px 10px;
            font-size: 0.8em;
        }

        article h2 {
            font-size: 1.3em;
        }

        article h3 {
            font-size: 1em;
        }

        .btn {
            padding: 6px 12px;
            font-size: 0.8em;
        }
    }