/* 响应式设计 */
@media (min-width: 1600px) {
    .card {
        width: calc(20% - 16px);
    }
}

@media (max-width: 1400px) {
    .card {
        width: calc(33.333% - 14px);
    }
}

@media (max-width: 1000px) {
    .card {
        width: calc(50% - 10px);
    }
}

@media (max-width: 768px) {
    .navbar {
        top: 5px;
        left: 5px;
        width: calc(100% - 10px);
    }
    
    .card-container {
        padding-top: 120px;
        justify-content: center;
    }
    
    .card {
        width: 100%;
        max-width: 340px;
    }
    
    .download-banner {
        bottom: 66px;
        left: 50%;
        transform: translateX(-50%);
        width: auto;
        text-align: center;
        padding: 12px 20px;
        max-width: 100%;
        font-size: 14px;
    }
    
    .floating-controls {
        bottom: 60px;
    }
}