/* Basic reset for body */
body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
    font-size: large;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh; /* Full viewport height */
    background-color: #222222;
}

/* Container for centering content */
.container {
    background-color: #2a2a2a;
    padding: 24px;
    border-radius: 12px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
                0 4px 6px -2px rgba(0, 0, 0, 0.05);
    max-width: 80%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    border: 1px solid #3f3f3f;
    color: lightgray;
    margin: 15px;
}

.keypad {
    display: inline-grid;
    grid-template-columns: auto auto auto auto;
    gap: 5px;
}

.hide { display: none; }
@media only screen and (max-width: 40rem) {
    .hide {
        display: flex;
    }
}

.keypad div {
    text-align: center;
}

.keypad button {
    margin: 0;
    width: 80px;
    height: 60px;
    border-radius: 10px;
    border: 2px solid #3f3f3f;
    font-size: x-large;
    font-weight: bold;
    background-color: white;
}

.keypad button:active {
    background-color: #a2a2a2;
}

.keypad button.pressed {
    background-color: #a2a2a2;
}

h4 {
    margin: 0;
}

canvas {
    display: block;
    background: black;
    /* Big border to make the screen look sunken */
    border: 10px solid transparent;
    width: 100%;
    max-width: 100%;
    border-radius: 8px;
}

input[type="file"] {
    width: 100%;
    padding: 12px;
    border: 1px solid #3f3f3f;
    border-radius: 8px;
    color: gray;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

/* Basic styling for the file input button, as default browser styles vary */
input[type="file"]::-webkit-file-upload-button {
    margin-right: 16px;
    padding: 8px 16px;
    border-radius: 9999px;
    border: 0;
    font-size: 0.875rem;
    font-weight: 600;
    background-color: white;
    color: black;
    cursor: pointer;
    transition: background-color 0.2s;
}

input[type="file"]::-webkit-file-upload-button:hover {
    background-color: gray;
}

/* Firefox specific styling */
input[type="file"]::file-selector-button {
    margin-right: 16px;
    padding: 8px 16px;
    border-radius: 9999px;
    border: 0;
    font-size: 0.875rem;
    font-weight: 600;
    background-color: white;
    color: black;
    cursor: pointer;
    transition: background-color 0.2s;
}

input[type="file"]::file-selector-button:hover {
    background-color: gray;
}