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

    /* Body Styling */
    body {
        font-family: 'Open Sans', sans-serif;
        background: radial-gradient(circle, rgb(255, 87, 34), transparent);
        color: #333;
        line-height: 1.6;
        padding: 20px;
    }

    /* Container Layout */
    .container {
        display: grid;
        grid-template-columns: 220px 1fr 1fr 1fr;
        grid-gap: 20px;
    }

    /* Navigation Bar */
    .sidebar {
        background: linear-gradient(135deg, #6a11cb, #2575fc);
        color: white;
        padding: 20px;
        position: fixed;
        height: 100vh;
        overflow-y: auto;
    }

    .sidebar h2 {
        font-family: 'Roboto Slab', serif;
        margin-bottom: 20px;
    }

    .sidebar ul {
        list-style: none;
    }

    .sidebar ul li {
        margin-bottom: 15px;
    }

    .sidebar ul li a {
        color: white;
        text-decoration: none;
        transition: color 0.3s ease;
    }

    .sidebar ul li a:hover {
        color: #ff9800;
    }

    /* Main Content */
    .main-content {
        margin-left: 240px;
        display: grid;
        grid-template-columns: 1fr 1fr 1fr;
        grid-gap: 20px;
    }

    /* Cards */
    .card {
        background-color: #ffffff;
        border-radius: 8px;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        padding: 20px;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .card:hover {
        transform: translateY(-10px);
        box-shadow: 0 10px 15px rgba(0,0,0,0.2);
    }

    .card h3 {
        font-family: 'Roboto Slab', serif;
        margin-bottom: 15px;
        color: #2575fc;
    }

    .card p {
        margin-bottom: 10px;
    }

    .card pre {
        background-color: #f4f4f4;
        padding: 10px;
        border-radius: 5px;
        overflow-x: auto;
    }

    /* 示例展示 */
    .example-display {
        grid-column: 1 / -1;
        background: linear-gradient(135deg, #ff7e5f, #feb47b);
        padding: 20px;
        border-radius: 8px;
        color: white;
        position: relative;
    }

    .example-display h2 {
        font-family: 'Roboto Slab', serif;
        margin-bottom: 15px;
    }

    .example-display article {
        background-color: rgba(255,255,255,0.2);
        padding: 15px;
        border-radius: 5px;
        overflow: auto;
    }

    .example-display pre {
        background-color: rgba(0,0,0,0.1);
        padding: 10px;
        border-radius: 5px;
        overflow-x: auto;
        color: #d1c4e9;
    }

    /* Images */
    .images {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
    }

    .images img {
        width: 100%;
        max-width: 150px;
        border-radius: 5px;
    }

    /* 按钮样式 */
    .button {
        background-color: #4CAF50;
        color: white;
        border: none;
        padding: 10px 20px;
        text-align: center;
        text-decoration: none;
        display: inline-block;
        font-size: 16px;
        transition: transform 0.3s ease, background-color 0.3s ease;
        cursor: pointer;
    }

    .button:hover {
        transform: scale(1.1);
        background-color: #45a049;
    }

    /* Responsive Design */
    @media (max-width: 1440px) {
        .main-content {
            grid-template-columns: 1fr 1fr 1fr;
        }
    }

    @media (max-width: 1200px) {
        .main-content {
            grid-template-columns: 1fr 1fr;
        }
    }

    @media (max-width: 1024px) {
        .main-content {
            grid-template-columns: 1fr;
        }
    }

    @media (max-width: 768px) {
        .container {
            grid-template-columns: 1fr;
        }

        .sidebar {
            position: relative;
            height: auto;
        }

        .main-content {
            margin-left: 0;
            grid-template-columns: 1fr;
        }
    }

    @media (max-width: 480px) {
        .card {
            padding: 15px;
        }

        .button {
            padding: 8px 16px;
            font-size: 14px;
        }
    }

    @media (max-width: 320px) {
        .images img {
            max-width: 100px;
        }
    }

    /* 动画效果 */
    @keyframes aurora-move {
        0% { background-position: 0% 50%; }
        50% { background-position: 100% 50%; }
        100% { background-position: 0% 50%; }
    }

    .animated-background {
        background: radial-gradient(circle, rgb(255, 87, 34), transparent);
        animation: aurora-move 15s linear infinite;
    }

    /* 提示信息 */
    .prompt {
        text-align: center;
        font-size: 18px;
        margin-bottom: 20px;
        color: #ff9800;
    }

    /* 内部链接 */
    a.internal-link {
        color: #2575fc;
        text-decoration: none;
    }

    a.internal-link:hover {
        text-decoration: underline;
    }