:root {
        --primary-color: #0D47A1;
        --secondary-color: #424242;
        --accent-color: #FFC107;
        --background-gradient: linear-gradient(135deg, #0D47A1, #424242);
        --text-color: #FFFFFF;
        --font-primary: 'Roboto', 'Montserrat', sans-serif;
    }

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

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

    header {
        text-align: center;
        padding: 50px 0;
    }

    header h1 {
        font-size: 3rem;
        margin-bottom: 20px;
    }

    main {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 40px;
        padding: 20px;
    }

    section {
        background: rgba(0, 0, 0, 0.5);
        padding: 20px;
        border-radius: 10px;
    }

    article {
        background: rgba(255, 255, 255, 0.1);
        padding: 20px;
        border-radius: 10px;
    }

    article h2 {
        font-size: 2rem;
        margin-bottom: 15px;
    }

    article h3 {
        font-size: 1.5rem;
        margin-top: 20px;
        margin-bottom: 10px;
    }

    article p {
        margin-bottom: 15px;
    }

    pre {
        background: #263238;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
    }

    code {
        color: #FFC107;
        font-family: 'Courier New', Courier, monospace;
    }

    .images-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 10px;
    }

    .images-grid img {
        width: 100%;
        height: auto;
        border-radius: 5px;
    }

    footer {
        text-align: center;
        padding: 30px 0;
        background: rgba(0, 0, 0, 0.7);
        border-radius: 10px;
        margin-top: 40px;
    }

    @media (max-width: 1440px) {
        main {
            grid-template-columns: 1fr;
        }

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

    @media (max-width: 1200px) {
        header h1 {
            font-size: 2rem;
        }
    }

    @media (max-width: 1024px) {
        main {
            grid-template-columns: 1fr;
        }
    }

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

        header h1 {
            font-size: 1.8rem;
        }

        article h2 {
            font-size: 1.5rem;
        }

        article h3 {
            font-size: 1.2rem;
        }
    }

    @media (max-width: 480px) {
        header h1 {
            font-size: 1.5rem;
        }

        article h2 {
            font-size: 1.2rem;
        }

        article h3 {
            font-size: 1rem;
        }
    }

    @media (max-width: 320px) {
        body {
            padding: 10px;
        }

        header h1 {
            font-size: 1.2rem;
        }

        article h2 {
            font-size: 1rem;
        }

        article h3 {
            font-size: 0.9rem;
        }
    }

    /* 动画效果 */
    @keyframes fadeIn {
        from { opacity: 0; }
        to { opacity: 1; }
    }

    .fade-in {
        animation: fadeIn 2s ease-in-out;
    }