/* 全局样式 */
    :root {
        --primary-color: #0074D9; /* 深蓝 */
        --secondary-color: #85C1E9; /* 浅灰蓝 */
        --accent-color-1: #F4D03F; /* 亮黄 */
        --accent-color-2: #2ECC71; /* 霓虹绿 */
        --background-color: #F5F5F5; /* 浅灰背景 */
        --text-color: #333333;
        --font-family: 'Roboto', sans-serif;
    }

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

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

    header {
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        color: white;
        padding: 40px 20px;
        text-align: center;
        position: relative;
        overflow: hidden;
    }

    header h1 {
        font-size: 2.5em;
        margin-bottom: 10px;
        font-weight: bold;
    }

    header p {
        font-size: 1.2em;
    }

    .container {
        display: grid;
        grid-template-columns: repeat(12, 1fr);
        gap: 20px;
        max-width: 1200px;
        margin: 40px auto;
    }

    .card {
        grid-column: span 12;
        background-color: white;
        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 img {
        width: 100%;
        border-radius: 8px;
        margin-bottom: 15px;
    }

    .card h2 {
        font-size: 1.8em;
        color: var(--primary-color);
        margin-bottom: 10px;
    }

    .card p {
        font-size: 1em;
        margin-bottom: 15px;
    }

    .card pre {
        background: #2d2d2d;
        color: #f8f8f2;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
        font-size: 0.9em;
        margin-bottom: 15px;
    }

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

    footer {
        text-align: center;
        padding: 20px;
        background: var(--secondary-color);
        color: white;
        margin-top: 40px;
        border-radius: 8px;
    }

    /* 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;
    }

    /* 响应式设计 */
    @media (max-width: 1440px) {
        header h1 {
            font-size: 2.2em;
        }
        .container {
            gap: 15px;
        }
        .card h2 {
            font-size: 1.6em;
        }
    }

    @media (max-width: 1200px) {
        .container {
            grid-template-columns: repeat(12, 1fr);
        }
    }

    @media (max-width: 1024px) {
        .container {
            grid-template-columns: repeat(12, 1fr);
        }
    }

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

    @media (max-width: 480px) {
        header h1 {
            font-size: 1.8em;
        }
        .container {
            grid-template-columns: repeat(4, 1fr);
        }
        .card {
            grid-column: span 4;
        }
    }

    @media (max-width: 320px) {
        header h1 {
            font-size: 1.5em;
        }
        .container {
            grid-template-columns: repeat(2, 1fr);
        }
        .card {
            grid-column: span 2;
        }
    }

    /* 导航栏 */
    nav {
        position: fixed;
        top: 0;
        width: 100%;
        background: rgba(0, 0, 0, 0.7);
        padding: 10px 20px;
        z-index: 1000;
    }

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

    nav ul li {
        margin: 0 15px;
    }

    nav ul li a {
        color: white;
        text-decoration: none;
        font-size: 1em;
        transition: color 0.3s ease;
    }

    nav ul li a:hover {
        color: var(--accent-color-1);
    }

    /* 搜索框 */
    .search-container {
        margin-top: 20px;
        text-align: center;
    }

    .search-container input[type="text"] {
        padding: 10px;
        width: 80%;
        max-width: 400px;
        border: 2px solid var(--accent-color-1);
        border-radius: 5px;
        font-size: 1em;
    }

    /* 提示信息 */
    .reference-note {
        text-align: center;
        font-size: 1em;
        color: var(--secondary-color);
        margin-top: 20px;
    }

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

    .image-grid img {
        width: 100%;
        border-radius: 5px;
    }