* {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }
    
    body {
        font-family: 'Segoe UI', Arial, sans-serif;
        max-width: 800px;
        margin: 20px auto;
        padding: 0 15px;
        background-color: #121212;
        color: #e0e0e0;
        font-size: 15px;
    }
    
    .container {
        background-color: #1e1e1e;
        padding: 25px;
        border-radius: 12px;
        box-shadow: 0 4px 25px rgba(0, 0, 0, 0.4);
    }
    
    h1 {
        color: #ffffff;
        text-align: center;
        margin: 0 0 25px;
        font-weight: 600;
        letter-spacing: 0.3px;
        font-size: 1.5rem;
        line-height: 1.4;
    }
    
    .download-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        padding: 8px 16px;
        background-color: #1976d2;
        color: white;
        text-decoration: none;
        border-radius: 6px;
        font-size: 14px;
        transition: all 0.3s ease;
        margin-bottom: 20px;
        border: none;
        cursor: pointer;
    }
    
    .download-btn:hover {
        background-color: #1565c0;
        transform: translateY(-1px);
    }

    .package-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        padding: 8px 16px;
        background-color: #1976d2;
        color: white;
        text-decoration: none;
        border-radius: 6px;
        font-size: 14px;
        transition: all 0.3s ease;
        border: none;
        cursor: pointer;
    }
    
    .package-btn:hover {
        background-color: #1565c0;
        transform: translateY(-1px);
    }
    
    .package-download {
        margin-top: 15px;
        text-align: center;
    }
    
    .device-info {
        background-color: #282828;
        padding: 20px;
        border-radius: 8px;
        margin-bottom: 20px;
    }
    
    .device-info:last-child {
        margin-bottom: 25px;
    }
    
    .device-info h1 {
        color: #ffffff;
        margin-bottom: 15px;
        font-size: 1.3rem;
    }
    
    .device-info p {
        margin-bottom: 12px;
        display: flex;
        color: #bbbbbb;
        line-height: 1.6;
    }
    
    .device-info p:last-child {
        margin-bottom: 0;
    }
    
    .device-info strong {
        color: #ffffff;
        min-width: 100px;
        flex-shrink: 0;
    }
    
    .error, .warning {
        text-align: center;
        padding: 20px;
        margin-bottom: 20px;
        border-radius: 8px;
    }
    
    .error {
        color: #ef5350;
        font-weight: bold;
        background-color: rgba(239, 83, 80, 0.1);
    }
    
    .warning {
        color: #ffb74d;
        background-color: rgba(255, 183, 77, 0.1);
    }
    
    .data-source {
        text-align: center;
        font-size: 13px;
        color: #888;
        margin-bottom: 20px;
        padding: 8px;
        background-color: #282828;
        border-radius: 4px;
    }
    
    .qq-group-link {
        color: #bbbbbb;
        text-decoration: none;
        transition: color 0.3s ease;
    }
    
    .qq-group-link:hover {
        color: #e0e0e0;
    }
    
    footer {
        text-align: center;
        color: #888;
        font-size: 13px;
        margin-top: 25px;
        padding-top: 15px;
        border-top: 1px solid #333;
    }
    
    @media (max-width: 576px) {
        .container {
            padding: 15px;
        }
        
        h1 {
            font-size: 1.3rem;
            margin-bottom: 20px;
        }
        
        .device-info {
            padding: 15px;
        }
        
        .device-info p {
            flex-direction: column;
        }
        
        .device-info strong {
            margin-bottom: 4px;
            min-width: auto;
        }
    }