/* 根变量定义 */
    :root {
        --primary-dark-blue: #0A192F;
        --primary-gradient: linear-gradient(to right, #2E4C6D, #1E3A5F);
        --secondary-silver: #B2BABB;
        --secondary-bright-blue: #4CAF50;
        --accent-neon-pink: #FF6F61;
        --accent-cyan-green: #00FFC6;
        --font-title: 'Poppins', sans-serif;
        --font-body: 'Roboto', sans-serif;
        --transition-speed: 0.5s;
    }

    /* 全局样式 */
    body {
        margin: 0;
        padding: 0;
        background: radial-gradient(circle, rgba(10, 25, 47, 1) 0%, rgba(30, 58, 95, 1) 70%, rgba(0, 0, 0, 1) 100%);
        color: var(--secondary-silver);
        font-family: var(--font-body);
        line-height: 1.6;
        overflow-x: hidden;
    }

    /* 标题样式 */
    h1, h2, h3, h4 {
        font-family: var(--font-title);
        color: var(--secondary-bright-blue);
        margin-top: 1.5em;
        margin-bottom: 0.5em;
    }

    h1 {
        font-size: 2.5em;
        text-align: center;
        margin-top: 0.5em;
    }

    h2 {
        font-size: 2em;
    }

    h3 {
        font-size: 1.75em;
    }

    h4 {
        font-size: 1.5em;
    }

    /* 段落样式 */
    p {
        margin-bottom: 1em;
        font-size: 1em;
        color: #D3D3D3;
    }

    /* 链接样式 */
    a {
        color: var(--secondary-bright-blue);
        text-decoration: none;
        transition: color var(--transition-speed);
    }

    a:hover {
        color: var(--accent-neon-pink);
    }

    /* 按钮样式 */
    button {
        background: var(--primary-gradient);
        color: #FFFFFF;
        border: none;
        padding: 10px 20px;
        border-radius: 5px;
        cursor: pointer;
        transition: background-color var(--transition-speed), transform var(--transition-speed);
        font-family: var(--font-title);
    }

    button:hover {
        background: var(--accent-neon-pink);
        transform: translateY(-5px);
    }

    /* 代码块样式 */
    pre {
        background: #1E1E1E;
        color: #C5C5C5;
        padding: 15px;
        border-radius: 5px;
        overflow: auto;
        font-family: 'Courier New', Courier, monospace;
        margin-bottom: 1.5em;
    }

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

    /* 表格样式 */
    table {
        width: 100%;
        border-collapse: collapse;
        margin-bottom: 1.5em;
    }

    th, td {
        border: 1px solid #555555;
        padding: 10px;
        text-align: left;
    }

    th {
        background-color: #1E3A5F;
        color: #FFFFFF;
    }

    /* 图像样式 */
    .images {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
        justify-content: center;
        margin-bottom: 2em;
    }

    .images img {
        width: 100%;
        max-width: 320px;
        border-radius: 10px;
        box-shadow: 0 4px 8px rgba(0,0,0,0.3);
    }

    /* 栅格系统 */
    .container {
        width: 90%;
        max-width: 1200px;
        margin: 0 auto;
        padding: 20px;
    }

    .grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 20px;
    }

    .card {
        background: rgba(255, 255, 255, 0.05);
        padding: 20px;
        border-radius: 10px;
        box-shadow: 0 4px 6px rgba(0,0,0,0.3);
        transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    }

    .card:hover {
        transform: translateY(-10px);
        box-shadow: 0 8px 12px rgba(0,0,0,0.5);
    }

    /* 动画效果 */
    @keyframes fadeIn {
        from { opacity: 0; }
        to { opacity: 1; }
    }

    @keyframes rotateChart {
        from { transform: rotateY(0deg); }
        to { transform: rotateY(360deg); }
    }

    .fade-in {
        animation: fadeIn 2s ease-in-out;
    }

    .rotating-chart {
        animation: rotateChart 15s linear infinite;
    }

    /* 响应式设计 */
    @media (max-width: 320px) {
        h1 {
            font-size: 1.8em;
        }
        h2 {
            font-size: 1.5em;
        }
        p, pre, code {
            font-size: 0.9em;
        }
    }

    @media (max-width: 480px) {
        .grid {
            grid-template-columns: 1fr;
        }
        h1 {
            font-size: 2em;
        }
    }

    @media (max-width: 768px) {
        .images {
            flex-direction: column;
            align-items: center;
        }
        .container {
            padding: 15px;
        }
    }

    @media (max-width: 1024px) {
        .grid {
            grid-template-columns: repeat(2, 1fr);
        }
    }

    @media (min-width: 1200px) {
        .container {
            padding: 40px;
        }
        h1 {
            font-size: 3em;
        }
    }

    @media (min-width: 1440px) {
        .grid {
            grid-template-columns: repeat(3, 1fr);
        }
    }

    /* 额外设计元素 */
    .footer {
        text-align: center;
        padding: 20px 0;
        background: rgba(255, 255, 255, 0.05);
        color: #AAAAAA;
        font-size: 0.9em;
    }

    .highlight {
        color: var(--accent-cyan-green);
        font-weight: bold;
    }