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

    body {
        font-family: 'Poppins', sans-serif;
        background: linear-gradient(135deg, #1e1e1e, #2c2c2c);
        color: #f0f0f0;
        line-height: 1.6;
        padding: 20px;
    }

    header {
        text-align: center;
        padding: 50px 20px;
        background: radial-gradient(circle, rgba(255,87,34,1) 0%, rgba(255,140,0,1) 100%);
        border-radius: 15px;
        margin-bottom: 40px;
    }

    header h1 {
        font-size: 2.5em;
        margin-bottom: 10px;
        color: #ffffff;
    }

    header p {
        font-size: 1.2em;
        color: #ffd700;
    }

    nav {
        display: flex;
        justify-content: center;
        gap: 20px;
        margin-bottom: 40px;
    }

    nav a {
        text-decoration: none;
        color: #00bfff;
        font-weight: 500;
        transition: color 0.3s ease;
    }

    nav a:hover {
        color: #ff6347;
    }

    .container {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 30px;
        margin-bottom: 40px;
    }

    .card {
        background: #333333;
        padding: 20px;
        border-radius: 10px;
        box-shadow: 0 4px 8px rgba(0,0,0,0.2);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .card:hover {
        transform: translateY(-10px);
        box-shadow: 0 8px 16px rgba(0,0,0,0.3);
    }

    .card img {
        width: 100%;
        height: auto;
        border-radius: 5px;
        margin-bottom: 15px;
    }

    .card h3 {
        font-size: 1.5em;
        margin-bottom: 10px;
        color: #00bfff;
    }

    .card p {
        font-size: 1em;
        color: #cccccc;
    }

    .highlight {
        color: #ff6347;
        font-weight: bold;
    }

    article {
        background: #2c2c2c;
        padding: 30px;
        border-radius: 10px;
        margin-bottom: 40px;
    }

    article h2 {
        font-size: 2em;
        margin-bottom: 20px;
        color: #ff8c00;
    }

    article h3 {
        font-size: 1.5em;
        margin-top: 20px;
        margin-bottom: 10px;
        color: #00bfff;
    }

    article p {
        margin-bottom: 15px;
        color: #d3d3d3;
    }

    pre {
        background: #1e1e1e;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
        margin-bottom: 15px;
    }

    code {
        font-family: 'Courier New', Courier, monospace;
        color: #f8f8f2;
    }

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

    table, th, td {
        border: 1px solid #555555;
    }

    th, td {
        padding: 10px;
        text-align: left;
        color: #f0f0f0;
    }

    th {
        background: #444444;
    }

    footer {
        text-align: center;
        padding: 20px;
        background: radial-gradient(circle, rgba(34,193,195,1) 0%, rgba(253,187,45,1) 100%);
        border-radius: 15px;
    }

    footer p {
        color: #ffffff;
        font-size: 1em;
    }

    /* 动画效果 */
    @keyframes aurora-move {
        0% { background-position: 0% 50%; }
        50% { background-position: 100% 50%; }
        100% { background-position: 0% 50%; }
    }

    .aurora-background {
        background: radial-gradient(circle, rgb(255, 87, 34), transparent);
        animation: aurora-move 15s linear infinite;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        z-index: -1;
    }

    /* 响应式设计 */
    @media (max-width: 320px) {
        header h1 {
            font-size: 1.8em;
        }
        .card h3 {
            font-size: 1.2em;
        }
        article h2 {
            font-size: 1.8em;
        }
    }

    @media (max-width: 480px) {
        nav {
            flex-direction: column;
            gap: 10px;
        }
    }

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

    @media (min-width: 1024px) {
        .container {
            grid-template-columns: repeat(3, 1fr);
        }
    }

    @media (min-width: 1200px) {
        .container {
            grid-template-columns: repeat(4, 1fr);
        }
    }

    @media (min-width: 1440px) {
        .container {
            grid-template-columns: repeat(5, 1fr);
        }
    }