:root {
        --primary-color: #003366; /* 深蓝色 */
        --secondary-color: #666666; /* 深灰色 */
        --accent-color: #FF9900; /* 橙色 */
        --background-color: #E0F7FA; /* 浅蓝色 */
        --highlight-color: #8BC34A; /* 绿色 */
        --text-color: #333333; /* 主文本颜色 */
        --card-background: #FFFFFF; /* 卡片背景 */
        --border-color: #DDDDDD; /* 边框颜色 */
        --font-title: 'Montserrat', sans-serif;
        --font-body: 'Open Sans', sans-serif;
    }

    body {
        margin: 0;
        padding: 0;
        font-family: var(--font-body);
        background: linear-gradient(135deg, #E0F7FA, #FFFFFF);
        color: var(--text-color);
        line-height: 1.6;
    }

    header {
        background: radial-gradient(circle, rgba(255,87,34,1) 0%, rgba(255,87,34,0) 70%);
        padding: 20px;
        text-align: center;
        animation: aurora-move 15s linear infinite;
    }

    header h1 {
        font-family: var(--font-title);
        color: var(--primary-color);
        font-size: 2.5em;
        margin: 0;
    }

    main {
        padding: 20px;
        max-width: 1200px;
        margin: 0 auto;
    }

    .card {
        background-color: var(--card-background);
        border: 1px solid var(--border-color);
        border-radius: 10px;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        margin: 20px 0;
        padding: 20px;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .card:hover {
        transform: translateY(-10px);
        box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    }

    h2, h3, h4 {
        font-family: var(--font-title);
        color: var(--primary-color);
    }

    h2 {
        font-size: 2em;
        margin-bottom: 10px;
    }

    h3 {
        font-size: 1.75em;
        margin-top: 20px;
        margin-bottom: 10px;
    }

    h4 {
        font-size: 1.5em;
        margin-top: 15px;
        margin-bottom: 10px;
    }

    p {
        margin: 10px 0;
    }

    pre {
        background-color: #f5f5f5;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
    }

    code {
        font-family: 'Courier New', Courier, monospace;
        color: #d6336c;
    }

    table {
        width: 100%;
        border-collapse: collapse;
        margin: 20px 0;
    }

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

    table th {
        background-color: var(--background-color);
        font-weight: bold;
    }

    img {
        max-width: 100%;
        height: auto;
        border-radius: 10px;
        margin: 10px 0;
    }

    .sample-data ul {
        list-style-type: disc;
        padding-left: 20px;
    }

    .sample-data li {
        margin: 5px 0;
    }

    footer {
        background-color: var(--secondary-color);
        color: #FFFFFF;
        text-align: center;
        padding: 20px;
        margin-top: 40px;
    }

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

    @keyframes aurora-move {
        0% {
            background-position: 0% 50%;
        }
        50% {
            background-position: 100% 50%;
        }
        100% {
            background-position: 0% 50%;
        }
    }

    button {
        background-color: var(--accent-color);
        border: none;
        padding: 10px 20px;
        font-size: 16px;
        cursor: pointer;
        border-radius: 5px;
        transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    button:hover {
        transform: scale(1.05);
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    }

    .material-button {
        background: linear-gradient(to bottom, #FFFFFF, #CCCCCC);
        border: 1px solid #999999;
        border-radius: 5px;
        padding: 10px 20px;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
        transition: all 0.3s ease;
    }

    .material-button:hover {
        background: linear-gradient(to bottom, #DDDDDD, #AAAAAA);
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    }

    /* Responsive Design */
    @media (max-width: 1440px) {
        header h1 {
            font-size: 2.2em;
        }
    }

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

    @media (max-width: 1024px) {
        .card {
            padding: 15px;
        }
    }

    @media (max-width: 768px) {
        header h1 {
            font-size: 2em;
        }
        .card {
            margin: 15px 0;
            padding: 15px;
        }
    }

    @media (max-width: 480px) {
        header h1 {
            font-size: 1.5em;
        }
        h2 {
            font-size: 1.5em;
        }
        h3 {
            font-size: 1.25em;
        }
        h4 {
            font-size: 1.1em;
        }
        button {
            padding: 8px 16px;
            font-size: 14px;
        }
    }

    @media (max-width: 320px) {
        header h1 {
            font-size: 1.2em;
        }
        h2 {
            font-size: 1.3em;
        }
        h3 {
            font-size: 1em;
        }
        h4 {
            font-size: 0.9em;
        }
        button {
            padding: 6px 12px;
            font-size: 12px;
        }
    }