:root {
        --primary-color: #1E3A8A; /* 深蓝 */
        --secondary-color: #F3F4F6; /* 银灰 */
        --accent-color: #10B981; /* 高亮绿 */
        --gradient-background: linear-gradient(135deg, #6B73FF 0%, #000DFF 100%);
        --hover-gradient: linear-gradient(45deg, #FF6B6B, #FFD93D);
        --font-primary: 'Roboto', sans-serif;
        --font-secondary: 'Open Sans', sans-serif;
        --transition-speed: 0.3s;
        --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }

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

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

    header {
        text-align: center;
        padding: 50px 20px;
        background: rgba(30, 58, 138, 0.8);
        border-radius: 15px;
        box-shadow: var(--box-shadow);
        margin-bottom: 40px;
    }

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

    header p {
        font-size: 1.2rem;
        color: #D1D5DB;
    }

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

    .module {
        background: rgba(255, 255, 255, 0.1);
        border-radius: 10px;
        padding: 20px;
        box-shadow: var(--box-shadow);
        transition: transform var(--transition-speed), background var(--transition-speed);
    }

    .module:hover {
        transform: translateY(-10px);
        background: rgba(255, 255, 255, 0.2);
    }

    .module h2 {
        font-family: var(--font-secondary);
        font-size: 1.5rem;
        color: var(--accent-color);
        margin-bottom: 15px;
    }

    .module p {
        font-size: 1rem;
        color: #D1D5DB;
    }

    .button {
        display: inline-block;
        padding: 10px 20px;
        background: var(--accent-color);
        color: white;
        border: none;
        border-radius: 5px;
        cursor: pointer;
        transition: background var(--transition-speed), transform var(--transition-speed);
        text-decoration: none;
        font-size: 1rem;
    }

    .button:hover {
        background: var(--hover-gradient);
        transform: scale(1.05);
    }

    pre {
        background: rgba(0, 0, 0, 0.8);
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
        margin: 20px 0;
    }

    code {
        font-family: 'Courier New', Courier, monospace;
        color: #22C55E;
    }

    .reference {
        background: rgba(255, 255, 255, 0.1);
        padding: 30px;
        border-radius: 10px;
        box-shadow: var(--box-shadow);
        margin-top: 40px;
    }

    .reference h2 {
        color: #F9FAFB;
        margin-bottom: 20px;
        text-align: center;
    }

    .reference article {
        color: #D1D5DB;
    }

    .reference h3 {
        color: var(--accent-color);
        margin: 15px 0;
    }

    .reference p {
        margin-bottom: 15px;
        line-height: 1.8;
    }

    .image-gallery {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
        margin-top: 20px;
    }

    .image-gallery img {
        width: calc(33.333% - 10px);
        border-radius: 5px;
        transition: transform var(--transition-speed);
    }

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

    footer {
        text-align: center;
        padding: 20px;
        margin-top: 40px;
        color: #9CA3AF;
        font-size: 0.9rem;
    }

    @keyframes aurora-move {
        0% { background-position: 0% 50%; }
        50% { background-position: 100% 50%; }
        100% { background-position: 0% 50%; }
    }

    .animated-background {
        background: radial-gradient(circle, rgb(255, 87, 34), transparent);
        animation: aurora-move 15s linear infinite;
        height: 200px;
        border-radius: 10px;
        margin-bottom: 30px;
    }

    /* Responsive Design */
    @media (max-width: 1440px) {
        header h1 {
            font-size: 2rem;
        }

        .module h2 {
            font-size: 1.3rem;
        }
    }

    @media (max-width: 1200px) {
        .image-gallery img {
            width: calc(33.333% - 10px);
        }
    }

    @media (max-width: 1024px) {
        .container {
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        }

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

    @media (max-width: 768px) {
        body {
            padding: 15px;
        }

        .image-gallery img {
            width: 100%;
        }

        .module {
            padding: 15px;
        }

        header {
            padding: 30px 15px;
        }

        header h1 {
            font-size: 1.8rem;
        }

        .reference {
            padding: 20px;
        }
    }

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

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

        pre {
            font-size: 0.9rem;
        }
    }

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

        .module h2 {
            font-size: 1.1rem;
        }

        .button {
            padding: 6px 12px;
            font-size: 0.8rem;
        }

        pre {
            font-size: 0.8rem;
        }
    }