/* 全局样式 */
    body {
        margin: 0;
        padding: 0;
        font-family: 'Roboto', sans-serif;
        background: linear-gradient(135deg, #2c3e50, #8e44ad);
        color: #ffffff;
        line-height: 1.6;
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    header {
        width: 100%;
        padding: 20px;
        background: rgba(0, 0, 0, 0.5);
        text-align: center;
        background: linear-gradient(135deg, #2980b9, #8e44ad);
    }

    header h1 {
        margin: 0;
        font-size: 2.5em;
        color: #ffffff;
    }

    nav {
        margin: 20px 0;
    }

    nav a {
        color: #f39c12;
        text-decoration: none;
        margin: 0 15px;
        font-size: 1.1em;
        transition: color 0.3s ease;
    }

    nav a:hover {
        color: #2ecc71;
    }

    .container {
        width: 90%;
        max-width: 1200px;
        display: grid;
        grid-template-columns: 1fr;
        gap: 30px;
        padding: 20px;
    }

    section {
        background: rgba(255, 255, 255, 0.1);
        padding: 20px;
        border-radius: 10px;
        box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    }

    h2, h3, h4 {
        color: #ecf0f1;
    }

    pre {
        background: #34495e;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
    }

    code {
        color: #2ecc71;
        font-family: 'Courier New', Courier, monospace;
    }

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

    table, th, td {
        border: 1px solid #95a5a6;
    }

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

    th {
        background: #2980b9;
    }

    img {
        width: 100%;
        max-width: 320px;
        height: auto;
        border-radius: 10px;
    }

    .sample-article {
        border: 2px dashed #e74c3c;
        padding: 20px;
        border-radius: 10px;
        background: rgba(231, 76, 60, 0.1);
    }

    .footer {
        width: 100%;
        padding: 20px;
        text-align: center;
        background: linear-gradient(135deg, #8e44ad, #2c3e50);
        color: #bdc3c7;
    }

    /* 响应式设计 */
    @media (min-width: 320px) {
        header h1 {
            font-size: 1.8em;
        }
    }

    @media (min-width: 480px) {
        header h1 {
            font-size: 2em;
        }

        nav a {
            margin: 0 20px;
        }
    }

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

        header h1 {
            font-size: 2.5em;
        }
    }

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

    @media (min-width: 1200px) {
        header h1 {
            font-size: 3em;
        }
    }

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