/* CSS Variables for Theme Colors */
    :root {
        --primary-color: #1A73E8; /* 冷静蓝 */
        --secondary-color: #F5F5F5; /* 浅灰 */
        --accent-color: #FFC107; /* 金色 */
        --highlight-color: #28A745; /* 绿色 */
        --text-color: #333333;
        --background-gradient: radial-gradient(circle, rgb(26, 115, 232), transparent);
        --font-family: 'Roboto', sans-serif;
    }

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

    body {
        font-family: var(--font-family);
        color: var(--text-color);
        background: var(--secondary-color);
        line-height: 1.6;
    }

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

    a[rel="nofollow"] {
        /* No additional styles needed */
    }

    img {
        max-width: 100%;
        height: auto;
        display: block;
    }

    /* Header Styles */
    header {
        background: var(--primary-color);
        color: white;
        padding: 20px;
        text-align: center;
        position: relative;
        background: var(--background-gradient);
        animation: aurora-move 15s linear infinite;
    }

    header h1 {
        font-size: 2em;
        margin-bottom: 10px;
    }

    header p {
        font-size: 1.2em;
    }

    /* Navigation Styles */
    .navbar {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 10px 20px;
        background-color: rgba(255, 255, 255, 0.8);
        position: sticky;
        top: 0;
        z-index: 1000;
    }

    .navbar .logo {
        font-size: 1.5em;
        font-weight: bold;
    }

    .navbar ul {
        list-style: none;
        display: flex;
    }

    .navbar ul li {
        margin-left: 20px;
    }

    .navbar ul li a {
        color: var(--text-color);
        font-weight: 500;
        transition: color 0.3s;
    }

    .navbar ul li a:hover {
        color: var(--accent-color);
    }

    /* Sidebar Styles */
    .sidebar {
        position: fixed;
        top: 0;
        left: -250px;
        width: 250px;
        height: 100%;
        background-color: var(--primary-color);
        transition: left 0.3s ease-in-out;
        padding-top: 60px;
    }

    .sidebar.open {
        left: 0;
    }

    .sidebar ul {
        list-style: none;
        padding: 0;
    }

    .sidebar ul li {
        padding: 15px 20px;
    }

    .sidebar ul li a {
        color: white;
        display: block;
    }

    /* Main Content Styles */
    main {
        padding: 20px;
        max-width: 1200px;
        margin: auto;
    }

    section {
        margin-bottom: 40px;
    }

    h2, h3, h4 {
        color: var(--primary-color);
        margin-bottom: 15px;
    }

    p {
        margin-bottom: 15px;
    }

    pre {
        background: #f0f0f0;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
    }

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

    /* Feature Modules */
    .features {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }

    .feature {
        background: white;
        padding: 20px;
        border-radius: 10px;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        text-align: center;
    }

    .feature img {
        width: 80px;
        height: 80px;
        margin-bottom: 15px;
    }

    .feature h4 {
        margin-bottom: 10px;
        color: var(--primary-color);
    }

    /* CTA Button */
    .cta-button {
        display: inline-block;
        background-color: var(--primary-color);
        color: white;
        padding: 15px 30px;
        border-radius: 50px;
        font-size: 1em;
        transition: background-color 0.3s, transform 0.3s;
        cursor: pointer;
    }

    .cta-button:hover {
        background: linear-gradient(45deg, var(--primary-color), var(--highlight-color));
        transform: scale(1.05);
    }

    /* Image Gallery */
    .gallery {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
    }

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

    /* Example Section */
    .example-section {
        background: var(--secondary-color);
        padding: 20px;
        border-radius: 10px;
    }

    .example-section h2 {
        text-align: center;
        margin-bottom: 20px;
    }

    /* Footer Styles */
    footer {
        background: var(--primary-color);
        color: white;
        text-align: center;
        padding: 20px;
    }

    /* Animations */
    @keyframes aurora-move {
        0% { background: radial-gradient(circle, rgb(26, 115, 232), transparent); }
        50% { background: radial-gradient(circle, rgb(26, 115, 232), rgb(255, 255, 255)); }
        100% { background: radial-gradient(circle, rgb(26, 115, 232), transparent); }
    }

    /* Responsive Styles */
    @media (max-width: 1440px) {
        .features {
            grid-template-columns: repeat(3, 1fr);
        }

        .gallery img {
            width: calc(25% - 10px);
        }
    }

    @media (max-width: 1200px) {
        .features {
            grid-template-columns: repeat(3, 1fr);
        }

        .gallery img {
            width: calc(33.333% - 10px);
        }
    }

    @media (max-width: 1024px) {
        .features {
            grid-template-columns: repeat(2, 1fr);
        }

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

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

        .navbar ul {
            display: none;
        }

        .sidebar {
            width: 100%;
        }

        .gallery img {
            width: 100%;
        }
    }

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

        .features {
            grid-template-columns: 1fr;
        }

        .gallery img {
            width: 100%;
        }
    }

    @media (max-width: 320px) {
        header h1 {
            font-size: 1.2em;
        }

        .cta-button {
            padding: 10px 20px;
            font-size: 0.9em;
        }
    }