/* Calculator App Styles */
body {
    font-family: 'Roboto', sans-serif;
    background-color: #f8f9fa;
}

.calculator {
    border-radius: 15px;
    overflow: hidden;
}

.display {
    position: relative;
}

#display {
    font-size: 2rem;
    height: 80px;
    border: 2px solid #dee2e6;
    background-color: #e9ecef;
}

.button-grid .btn {
    font-size: 1.25rem;
    padding: 15px 0;
    border-radius: 10px;
    font-weight: 500;
}

.button-grid .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.memory-indicator {
    min-height: 24px;
}

footer {
    position: fixed;
    bottom: 0;
    width: 100%;
}

@media (max-width: 768px) {
    .button-grid .btn {
        font-size: 1rem;
        padding: 12px 0;
    }
    
    #display {
        font-size: 1.5rem;
        height: 70px;
    }
}

@media (max-width: 576px) {
    .button-grid .btn {
        font-size: 0.9rem;
        padding: 10px 0;
    }
    
    #display {
        font-size: 1.25rem;
        height: 60px;
    }
}