/* 基础设置与变量 */
    :root {
        --primary-color: #0d47a1;
        --secondary-color: #ff9800;
        --background-color: #f5f5f5;
        --text-color: #333333;
        --heading-color: #0d47a1;
        --accent-color: #ff5722;
        --font-family: 'Roboto', sans-serif;
        --transition-speed: 0.3s;
        --max-width: 1200px;
    }

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

    body {
        font-family: var(--font-family);
        color: var(--text-color);
        background: linear-gradient(135deg, #e0e0e0, #ffffff);
        line-height: 1.6;
        padding: 20px;
        max-width: var(--max-width);
        margin: auto;
    }

    h2, h3, h4 {
        color: var(--heading-color);
        margin-bottom: 15px;
        position: relative;
    }

    h2::after, h3::after, h4::after {
        content: '';
        display: block;
        width: 50px;
        height: 3px;
        background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
        margin-top: 5px;
        border-radius: 2px;
    }

    p {
        margin-bottom: 20px;
        padding: 15px;
        background: rgba(255, 255, 255, 0.8);
        border-left: 5px solid var(--secondary-color);
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
    }

    p:hover {
        transform: translateY(-5px);
        box-shadow: 0 8px 12px rgba(0,0,0,0.2);
    }

    pre {
        background: #2d2d2d;
        color: #f8f8f2;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
        margin-bottom: 20px;
    }

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

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

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

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

    img {
        max-width: 100%;
        height: auto;
        border-radius: 10px;
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
    }

    img:hover {
        transform: scale(1.05);
        box-shadow: 0 8px 16px rgba(0,0,0,0.2);
    }

    .section {
        margin-bottom: 40px;
        padding: 20px;
        background: linear-gradient(135deg, #ffffff, #e0e0e0);
        border-radius: 15px;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        animation: fadeIn 1s ease-in-out;
    }

    @keyframes fadeIn {
        from { opacity: 0; transform: translateY(20px); }
        to { opacity: 1; transform: translateY(0); }
    }

    .decorative-line {
        height: 2px;
        background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
        margin: 30px 0;
        border-radius: 1px;
    }

    .reference-note {
        text-align: center;
        font-size: 18px;
        color: var(--accent-color);
        margin-top: 40px;
        padding: 10px;
        border: 2px dashed var(--secondary-color);
        border-radius: 5px;
        background: rgba(255, 152, 0, 0.1);
    }

    ul.data-list {
        list-style: none;
        padding-left: 0;
    }

    ul.data-list li {
        background: #ffffff;
        margin-bottom: 10px;
        padding: 15px;
        border-left: 5px solid var(--secondary-color);
        box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        transition: background var(--transition-speed) ease;
    }

    ul.data-list li:hover {
        background: #f1f1f1;
    }

    ul.data-list li::before {
        content: "•";
        color: var(--secondary-color);
        display: inline-block; 
        width: 1em;
        margin-left: -1em;
    }

    a {
        color: var(--primary-color);
        text-decoration: none;
        position: relative;
        transition: color var(--transition-speed) ease;
    }

    a::after {
        content: '';
        display: block;
        width: 0;
        height: 2px;
        background: var(--secondary-color);
        transition: width var(--transition-speed) ease;
        position: absolute;
        left: 0;
        bottom: -2px;
    }

    a:hover::after {
        width: 100%;
    }

    /* 响应式设计 */
    @media (max-width: 1200px) {
        body {
            padding: 15px;
        }
    }

    @media (max-width: 768px) {
        h2 {
            font-size: 1.5em;
        }

        h3 {
            font-size: 1.3em;
        }

        h4 {
            font-size: 1.1em;
        }

        p {
            padding: 10px;
        }

        .reference-note {
            font-size: 16px;
        }
    }

    @media (max-width: 480px) {
        h2::after, h3::after, h4::after {
            width: 30px;
        }

        .decorative-line {
            margin: 20px 0;
        }

        ul.data-list li {
            padding: 10px;
        }
    }