/* 全局样式 */
    @import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap');

    :root {
        --primary-color: #1E3A8A;
        --secondary-color: #0D47A1;
        --accent-color: #4CAF50;
        --background-gradient: radial-gradient(circle, rgba(30,58,138,1) 0%, rgba(13,71,161,1) 70%, rgba(224,224,224,0.3) 100%);
        --card-background: rgba(255, 255, 255, 0.1);
        --card-border: rgba(255, 255, 255, 0.2);
        --text-color: #FFFFFF;
        --secondary-text-color: #E0E0E0;
        --font-family: 'Roboto', 'Helvetica', sans-serif;
    }

    body {
        margin: 0;
        padding: 0;
        font-family: var(--font-family);
        background: var(--background-gradient);
        color: var(--text-color);
        line-height: 1.6;
        letter-spacing: 0.5px;
        overflow-x: hidden;
    }

    h1, h2, h3, h4, h5, h6 {
        color: var(--accent-color);
        margin-top: 0;
    }

    a {
        color: var(--accent-color);
        text-decoration: none;
    }

    a:hover {
        text-decoration: underline;
    }

    /* 容器样式 */
    .container {
        width: 90%;
        max-width: 1200px;
        margin: 0 auto;
        padding: 20px 0;
    }

    /* 头部样式 */
    header {
        text-align: center;
        padding: 50px 0;
        background: rgba(0, 0, 0, 0.3);
        border-bottom: 2px solid var(--accent-color);
    }

    header h1 {
        font-size: 2.5rem;
        margin-bottom: 10px;
    }

    header p {
        font-size: 1.2rem;
        color: var(--secondary-text-color);
    }

    /* 卡片网格布局 */
    .card-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 20px;
        margin: 40px 0;
    }

    /* 卡片样式 */
    .card {
        background: var(--card-background);
        border: 1px solid var(--card-border);
        border-radius: 12px;
        padding: 20px;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        backdrop-filter: blur(10px);
    }

    .card:hover {
        transform: scale(1.05);
        box-shadow: 0 8px 12px rgba(0, 0, 0, 0.5);
    }

    .card-icon {
        font-size: 2rem;
        margin-bottom: 15px;
    }

    .card-title {
        font-size: 1.5rem;
        margin-bottom: 10px;
        color: var(--accent-color);
    }

    .card-description {
        font-size: 1rem;
        margin-bottom: 15px;
        color: var(--secondary-text-color);
    }

    .card-button {
        display: inline-block;
        padding: 10px 20px;
        background: var(--accent-color);
        color: #fff;
        border: none;
        border-radius: 8px;
        cursor: pointer;
        transition: background 0.3s ease;
    }

    .card-button:hover {
        background: darken(var(--accent-color), 10%);
    }

    /* 示范展示样式 */
    .sample-display {
        background: rgba(0, 0, 0, 0.5);
        padding: 30px;
        border-radius: 12px;
        margin: 40px 0;
        color: #fff;
    }

    .sample-display h2 {
        margin-bottom: 20px;
        text-align: center;
    }

    .sample-display article {
        max-height: 600px;
        overflow-y: auto;
        padding-right: 10px;
    }

    .sample-display pre {
        background: rgba(255, 255, 255, 0.1);
        padding: 15px;
        border-radius: 8px;
        overflow-x: auto;
    }

    .sample-display code {
        font-family: 'Courier New', Courier, monospace;
        color: #4CAF50;
    }

    /* 页面提示 */
    .page-note {
        text-align: center;
        font-size: 1rem;
        margin-top: 20px;
        color: var(--secondary-text-color);
    }

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

    body {
        animation: aurora-move 15s linear infinite;
        background-size: 200% 200%;
    }

    /* 响应式设计 */
    @media (max-width: 1440px) {
        header h1 {
            font-size: 2.2rem;
        }
    }

    @media (max-width: 1200px) {
        .card-title {
            font-size: 1.3rem;
        }

        .card-description {
            font-size: 0.95rem;
        }
    }

    @media (max-width: 1024px) {
        header {
            padding: 40px 0;
        }

        .sample-display {
            padding: 20px;
        }
    }

    @media (max-width: 768px) {
        .card-grid {
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        }

        header h1 {
            font-size: 2rem;
        }
    }

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

        .card {
            padding: 15px;
        }

        .card-button {
            padding: 8px 16px;
            font-size: 0.9rem;
        }
    }

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

        .card-title {
            font-size: 1.1rem;
        }

        .card-description {
            font-size: 0.9rem;
        }

        .sample-display {
            padding: 15px;
        }
    }