/* CSS变量定义 */
    :root {
        --primary-color: #0D47A1; /* 深蓝 */
        --secondary-color: #E0E0E0; /* 金属银 */
        --accent-color: #FF9800; /* 亮橙 */
        --background-gradient: radial-gradient(circle, rgb(255, 87, 34), transparent);
        --font-primary: 'Roboto', sans-serif;
        --font-secondary: 'Montserrat', sans-serif;
    }

    /* 全局样式 */
    * {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }

    body {
        font-family: var(--font-secondary);
        background: var(--background-gradient);
        color: #FFFFFF;
        line-height: 1.6;
        animation: aurora-move 15s linear infinite;
    }

    /* 关键帧动画 */
    @keyframes aurora-move {
        0% { background: radial-gradient(circle, #0D47A1, transparent); }
        50% { background: radial-gradient(circle, #FF9800, transparent); }
        100% { background: radial-gradient(circle, #0D47A1, transparent); }
    }

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

    /* 容器布局 */
    .container {
        display: grid;
        grid-template-columns: repeat(12, 1fr);
        gap: 20px;
        padding: 20px;
        max-width: 1440px;
        margin: 0 auto;
    }

    /* 栅格系统 */
    .col-1 { grid-column: span 1; }
    .col-2 { grid-column: span 2; }
    .col-3 { grid-column: span 3; }
    .col-4 { grid-column: span 4; }
    .col-6 { grid-column: span 6; }
    .col-12 { grid-column: span 12; }

    /* 头部样式 */
    header {
        grid-column: 1 / -1;
        background-color: var(--primary-color);
        padding: 20px;
        text-align: center;
    }

    header h1 {
        font-family: var(--font-primary);
        font-size: 36px;
        font-weight: bold;
    }

    /* 导航栏 */
    nav {
        grid-column: 1 / -1;
        background-color: var(--secondary-color);
        padding: 10px 20px;
    }

    nav ul {
        list-style: none;
        display: flex;
        justify-content: center;
        flex-wrap: wrap;
    }

    nav ul li {
        margin: 0 15px;
    }

    nav ul li a {
        text-decoration: none;
        color: var(--primary-color);
        font-weight: bold;
        transition: color 0.3s ease;
    }

    nav ul li a:hover {
        color: var(--accent-color);
    }

    /* 主要内容区域 */
    main {
        grid-column: 1 / -1;
        padding: 20px;
    }

    main h2, main h3 {
        font-family: var(--font-primary);
        color: var(--accent-color);
        margin-bottom: 10px;
    }

    main h2 {
        font-size: 28px;
    }

    main h3 {
        font-size: 22px;
        margin-top: 20px;
    }

    main p {
        font-size: 16px;
        margin-bottom: 15px;
    }

    main pre {
        background-color: rgba(224, 224, 224, 0.2);
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
        margin-bottom: 15px;
    }

    main code {
        font-family: 'Courier New', Courier, monospace;
        color: #FF9800;
    }

    main table {
        width: 100%;
        border-collapse: collapse;
        margin-bottom: 20px;
    }

    main table, main th, main td {
        border: 1px solid var(--secondary-color);
    }

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

    main th {
        background-color: var(--primary-color);
    }

    /* 按钮样式 */
    .btn {
        background-color: var(--accent-color);
        border: none;
        padding: 10px 20px;
        color: #FFFFFF;
        font-weight: bold;
        cursor: pointer;
        transition: background-color 0.3s ease, transform 0.3s ease;
        border-radius: 5px;
    }

    .btn:hover {
        background-color: #FFC107;
        transform: scale(1.05);
    }

    /* 示例展示样式 */
    .example-article {
        grid-column: span 12;
        background-color: rgba(0, 0, 0, 0.5);
        padding: 20px;
        border-radius: 10px;
        animation: fadeIn 1s ease-in-out forwards;
        opacity: 0;
    }

    .example-article h2 {
        font-size: 24px;
        color: #FF9800;
        margin-bottom: 15px;
    }

    /* 图片样式 */
    .images-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
        gap: 10px;
        margin-bottom: 20px;
    }

    .images-grid img {
        width: 100%;
        height: auto;
        border-radius: 5px;
    }

    /* 响应式设计 */
    @media (max-width: 1440px) {
        header h1 {
            font-size: 32px;
        }

        main h2 {
            font-size: 26px;
        }

        main h3 {
            font-size: 20px;
        }
    }

    @media (max-width: 1200px) {
        .container {
            padding: 15px;
        }

        nav ul li {
            margin: 0 10px;
        }

        main p {
            font-size: 15px;
        }
    }

    @media (max-width: 1024px) {
        .container {
            grid-template-columns: repeat(8, 1fr);
        }

        main h1 {
            font-size: 28px;
        }

        .example-article {
            grid-column: span 8;
        }
    }

    @media (max-width: 768px) {
        .container {
            grid-template-columns: repeat(6, 1fr);
        }

        header h1 {
            font-size: 24px;
        }

        main h2 {
            font-size: 22px;
        }

        main h3 {
            font-size: 18px;
        }

        .example-article {
            grid-column: span 6;
        }
    }

    @media (max-width: 480px) {
        .container {
            grid-template-columns: repeat(4, 1fr);
        }

        nav ul {
            flex-direction: column;
            align-items: center;
        }

        nav ul li {
            margin: 10px 0;
        }

        main h2 {
            font-size: 20px;
        }

        main h3 {
            font-size: 16px;
        }

        .images-grid {
            grid-template-columns: repeat(2, 1fr);
        }

        .example-article {
            grid-column: span 4;
        }
    }

    @media (max-width: 320px) {
        .container {
            grid-template-columns: repeat(2, 1fr);
        }

        header h1 {
            font-size: 20px;
        }

        nav ul {
            padding: 0;
        }

        nav ul li {
            margin: 5px 0;
        }

        main h2 {
            font-size: 18px;
        }

        main h3 {
            font-size: 14px;
        }

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

        .images-grid {
            grid-template-columns: 1fr;
        }
    }

    /* 表单、输入框隐藏 */
    input, textarea, select, button[type="submit"] {
        display: none;
    }

    /* 代码块样式优化 */
    pre {
        background-color: #1E1E1E;
        color: #D4D4D4;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
    }

    code {
        font-family: 'Courier New', Courier, monospace;
        font-size: 14px;
    }

    /* 链接样式 */
    a {
        color: var(--accent-color);
        text-decoration: none;
    }

    a:hover {
        text-decoration: underline;
    }

    /* 表格优化 */
    table {
        width: 100%;
        border-collapse: collapse;
    }

    th, td {
        padding: 10px;
        border: 1px solid var(--secondary-color);
        text-align: left;
    }

    th {
        background-color: var(--primary-color);
        color: #FFFFFF;
    }

    /* 提示文字样式 */
    .note {
        grid-column: span 12;
        text-align: center;
        font-size: 18px;
        margin-top: 20px;
        color: var(--accent-color);
    }

    /* 特殊标识“示例展示” */
    .example-label {
        font-size: 16px;
        color: var(--accent-color);
        margin-bottom: 10px;
        display: block;
    }