:root {
        --main-bg: #121212;
        --sidebar-bg: #1E1E1E;
        --highlight-color1: #4C9AFF;
        --highlight-color2: #8E44AD;
        --highlight-color3: #FF7F50;
        --text-color: #ffffff;
        --secondary-text: #BDBDBD;
        --button-bg: linear-gradient(45deg, #4C9AFF, #8E44AD);
    }
    body {
        margin: 0;
        font-family: 'Roboto', sans-serif;
        background: linear-gradient(135deg, #1E1E1E, #121212);
        color: var(--text-color);
        display: flex;
        min-height: 100vh;
    }
    .sidebar {
        position: fixed;
        width: 220px;
        height: 100%;
        background-color: var(--sidebar-bg);
        padding: 20px;
        box-sizing: border-box;
    }
    .sidebar a {
        display: block;
        color: var(--text-color);
        text-decoration: none;
        margin: 15px 0;
        transition: color 0.3s;
    }
    .sidebar a:hover {
        color: var(--highlight-color1);
    }
    .content {
        margin-left: 240px;
        padding: 20px;
        flex: 1;
    }
    .footer {
        position: fixed;
        bottom: 20px;
        right: 20px;
        background: var(--button-bg);
        color: var(--text-color);
        padding: 10px 20px;
        border: none;
        border-radius: 5px;
        cursor: pointer;
        box-shadow: 0 4px 6px rgba(0,0,0,0.3);
        transition: transform 0.3s;
    }
    .footer:hover {
        transform: scale(1.05);
    }
    .example-article {
        background: rgba(255, 255, 255, 0.05);
        padding: 20px;
        border-radius: 10px;
        margin-top: 40px;
    }
    .example-article h2, .example-article h3, .example-article h4 {
        color: var(--highlight-color3);
    }
    .example-article pre {
        background: #1E1E1E;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
    }
    .example-article code {
        color: #4C9AFF;
        font-family: 'Courier New', Courier, monospace;
    }
    img {
        max-width: 100%;
        height: auto;
        border-radius: 5px;
        margin: 10px 0;
    }
    .highlight {
        color: var(--highlight-color1);
        font-weight: bold;
    }
    .reference-note {
        text-align: center;
        margin: 20px 0;
        font-size: 1.2em;
        color: var(--highlight-color2);
    }
    @media (max-width: 1440px) {
        .sidebar { width: 200px; }
        .content { margin-left: 220px; }
    }
    @media (max-width: 1200px) {
        .sidebar { width: 180px; }
        .content { margin-left: 200px; }
    }
    @media (max-width: 1024px) {
        .sidebar { display: none; }
        .content { margin: 0; }
    }
    @media (max-width: 768px) {
        .footer { right: 10px; bottom: 10px; padding: 8px 16px; }
    }
    @media (max-width: 480px) {
        .example-article { padding: 15px; }
        .footer { padding: 6px 12px; }
    }
    @media (max-width: 320px) {
        .reference-note { font-size: 1em; }
    }