:root {
        --primary-color: #004D99; /* 深蓝色 */
        --secondary-color: #3B8C75; /* 墨绿色 */
        --accent-color: #A6ACAF; /* 银灰色 */
        --background-gradient: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
        --card-bg: rgba(255, 255, 255, 0.1);
        --text-color: #ffffff;
        --font-family: 'Roboto', sans-serif;
        --transition-speed: 0.3s;
    }
    
    *, *::before, *::after {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }
    
    body {
        font-family: var(--font-family);
        background: var(--background-gradient);
        color: var(--text-color);
        line-height: 1.6;
        padding: 20px;
    }
    
    header {
        text-align: center;
        padding: 50px 20px;
        background: rgba(0, 0, 0, 0.3);
        border-radius: 10px;
        margin-bottom: 30px;
        backdrop-filter: blur(10px);
    }
    
    header h1 {
        font-size: 3rem;
        margin-bottom: 10px;
    }
    
    header p {
        font-size: 1.2rem;
        color: #d1d1d1;
    }
    
    .container {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 20px;
    }
    
    .card {
        background: var(--card-bg);
        border-radius: 15px;
        padding: 20px;
        box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
        border: 1px solid rgba(255, 255, 255, 0.18);
        transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    }
    
    .card:hover {
        transform: translateY(-10px);
        box-shadow: 0 16px 64px 0 rgba(31, 38, 135, 0.37);
    }
    
    .card img {
        width: 100%;
        border-radius: 10px;
        margin-bottom: 15px;
    }
    
    .card h3 {
        margin-bottom: 10px;
        color: var(--accent-color);
    }
    
    .card p {
        font-size: 0.95rem;
        color: #e0e0e0;
    }
    
    pre {
        background: rgba(0, 0, 0, 0.5);
        padding: 15px;
        border-radius: 10px;
        overflow: auto;
        font-size: 0.9rem;
        color: #00ffea;
    }
    
    code {
        font-family: 'Courier New', Courier, monospace;
    }
    
    article {
        background: rgba(255, 255, 255, 0.1);
        padding: 30px;
        border-radius: 15px;
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
        margin: 40px 0;
        border: 1px solid rgba(255, 255, 255, 0.18);
    }
    
    article h2 {
        color: var(--accent-color);
        margin-bottom: 20px;
        font-size: 2.5rem;
    }
    
    article h3 {
        color: var(--secondary-color);
        margin: 15px 0;
        font-size: 1.8rem;
    }
    
    article p {
        margin-bottom: 15px;
        font-size: 1rem;
    }
    
    ul {
        list-style: inside disc;
        margin-bottom: 15px;
    }
    
    button {
        background: transparent;
        border: 2px solid var(--accent-color);
        color: white;
        padding: 10px 20px;
        border-radius: 25px;
        cursor: pointer;
        transition: background var(--transition-speed), color var(--transition-speed);
        font-size: 1rem;
    }
    
    button:hover {
        background: var(--accent-color);
        color: var(--primary-color);
    }
    
    footer {
        text-align: center;
        padding: 20px;
        margin-top: 40px;
        background: rgba(0, 0, 0, 0.3);
        border-radius: 10px;
        backdrop-filter: blur(10px);
    }
    
    @media (max-width: 768px) {
        header h1 {
            font-size: 2rem;
        }
        
        article h2 {
            font-size: 2rem;
        }
        
        article h3 {
            font-size: 1.5rem;
        }
    }
    
    @media (max-width: 480px) {
        header, footer {
            padding: 20px 10px;
        }
        
        .container {
            grid-template-columns: 1fr;
        }
    }