/* 全局样式 */
    :root {
        --primary-color: #0074D9; /* 深蓝色 */
        --secondary-color: #F89820; /* 亮橙色 */
        --accent-color-1: #2ECC40; /* 绿色 */
        --accent-color-2: #B10DC9; /* 紫色 */
        --background-gradient: linear-gradient(135deg, #1e3c72, #2a5298);
        --text-color: #ffffff;
        --card-background: rgba(255, 255, 255, 0.1);
        --font-family-primary: 'Open Sans', sans-serif;
        --font-family-secondary: 'Poppins', sans-serif;
        --transition-speed: 0.3s;
    }

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

    body {
        font-family: var(--font-family-primary);
        color: var(--text-color);
        background: var(--background-gradient);
        line-height: 1.6;
        padding: 20px;
    }

    header {
        text-align: center;
        padding: 40px 20px;
        background: rgba(0, 0, 0, 0.5);
        border-radius: 10px;
        margin-bottom: 30px;
    }

    header h1 {
        font-family: var(--font-family-secondary);
        font-size: 2.5em;
        margin-bottom: 10px;
        letter-spacing: 0.05em;
    }

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

    nav {
        display: flex;
        justify-content: center;
        gap: 20px;
        margin-bottom: 30px;
    }

    nav a {
        text-decoration: none;
        color: var(--text-color);
        font-weight: bold;
        padding: 10px 15px;
        border-radius: 5px;
        transition: background var(--transition-speed);
    }

    nav a:hover {
        background: rgba(255, 255, 255, 0.2);
    }

    .container {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 20px;
    }

    .card {
        background: var(--card-background);
        padding: 20px;
        border-radius: 10px;
        box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
        backdrop-filter: blur(8.5px);
        -webkit-backdrop-filter: blur(8.5px);
        border: 1px solid rgba(255, 255, 255, 0.18);
        transition: transform var(--transition-speed);
    }

    .card:hover {
        transform: translateY(-10px);
    }

    .card img {
        width: 100%;
        border-radius: 10px;
        margin-bottom: 15px;
    }

    .card h3 {
        font-family: var(--font-family-secondary);
        margin-bottom: 10px;
    }

    .card p {
        font-size: 1em;
        color: #f0f0f0;
    }

    .article-section {
        background: rgba(255, 255, 255, 0.1);
        padding: 20px;
        border-radius: 10px;
        margin-top: 40px;
    }

    .article-section h2 {
        font-family: var(--font-family-secondary);
        margin-bottom: 15px;
        color: var(--secondary-color);
    }

    .article-section p {
        margin-bottom: 15px;
        color: #e0e0e0;
    }

    .article-section pre {
        background: rgba(0, 0, 0, 0.7);
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
        margin-bottom: 15px;
    }

    .article-section code {
        color: #00ff00;
        font-family: 'Courier New', Courier, monospace;
    }

    .gallery {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
        margin-top: 30px;
    }

    .gallery img {
        width: calc(25% - 10px);
        border-radius: 5px;
        transition: transform var(--transition-speed);
    }

    .gallery img:hover {
        transform: scale(1.05);
    }

    footer {
        text-align: center;
        margin-top: 50px;
        padding: 20px;
        background: rgba(0, 0, 0, 0.5);
        border-radius: 10px;
    }

    footer p {
        color: #cccccc;
    }

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

        .gallery img {
            width: calc(33.33% - 10px);
        }
    }

    @media (max-width: 1200px) {
        .gallery img {
            width: calc(50% - 10px);
        }
    }

    @media (max-width: 1024px) {
        nav {
            flex-direction: column;
            align-items: center;
        }

        .gallery img {
            width: 100%;
        }
    }

    @media (max-width: 768px) {
        header h1 {
            font-size: 2em;
        }

        .card {
            padding: 15px;
        }

        .gallery img {
            width: 100%;
        }
    }

    @media (max-width: 480px) {
        header h1 {
            font-size: 1.8em;
        }

        nav a {
            padding: 8px 12px;
            font-size: 0.9em;
        }

        .card {
            padding: 10px;
        }

        .article-section h2 {
            font-size: 1.5em;
        }
    }

    @media (max-width: 320px) {
        header h1 {
            font-size: 1.5em;
        }

        nav a {
            padding: 6px 10px;
            font-size: 0.8em;
        }

        .card {
            padding: 8px;
        }

        .article-section h2 {
            font-size: 1.2em;
        }
    }

    /* 渐变动画效果 */
    @keyframes aurora-move {
        0% { background: radial-gradient(circle, rgba(255,87,34,0.8), transparent); }
        50% { background: radial-gradient(circle, rgba(34, 193, 195,0.8), transparent); }
        100% { background: radial-gradient(circle, rgba(255,87,34,0.8), transparent); }
    }

    .animated-background {
        animation: aurora-move 15s linear infinite;
    }

    /* 按钮样式 */
    .btn {
        background: var(--secondary-color);
        color: var(--background-gradient);
        padding: 10px 20px;
        border: none;
        border-radius: 5px;
        cursor: pointer;
        transition: background var(--transition-speed);
        font-family: var(--font-family-secondary);
    }

    .btn:hover {
        background: var(--accent-color-1);
    }