:root.light {
    --bg-color:#ffffff;
    --text-color:#000000;
    --keypad_bg_color0:#ff0000;
    --keypad-bg-color1:#00000038;
}

:root {
    --bg-color:#5e5b5b;
    --text-color:#ffffff;
    --keypad-bg-color0:#00000069;
    --keypad-bg-color1:#a01d00;
}

body {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
    background-color: var(--bg-color);
    font-family:monospace;
    font-size: 1.5em;
    font-style: italic;

}

h2 {
    margin-right: 10px;
    color:#ffffff
    
}

.calculator {
    aspect-ratio: 9/16;
    width: 100%;
    max-width: 350px;
    background-color: var(--keypad-bg-color0);
    box-shadow: 0 0 10px rgb(0, 0, 0);
    border-radius: 20px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;

}

.calculator .display {
    background-color: var(--bg-color);
    border-radius: 5px;
    box-shadow: 0 0 5px var(--keypad_bg_color0);
    padding: 10px;
    height: 20%;

}

.calculator .display input {
    width: 100%;
    height: 100%;
    background-color: transparent;
    border: none;
    outline: none;
    text-align: right;
    font-size: 2rem;
    color: var(--text-color);

}

.calculator .keys {
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 20px;
    height: 80%;
    cursor: pointer;

}

.calculator .keys button {
    background-color: var(--bg-color);
    border: solid 1px var(--keypad_bg_color0);
    border-radius: 5px;
    padding: 10px;
    font-size: 2rem;
    color: var(--text-color);
    cursor: pointer;
    outline: none;
    box-shadow: 1px 1px 5px var(--keypad-bg-color1), -1px - 1px -5px var(--keypad-bg-color1);

}

.calculator .keys .equalbtn {
    grid-column: 3/5;
    background-color: var(--keypad-bg-color1);
    color: var(--text-color);
}

.theme-switch {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    margin-bottom: 10px;

}

.theme-toggle-label {
    display: block;
    width: 40px;
    height: 20px;
    background-color: var(--keypad-bg-color1);
    border-radius: 20px;
    position: relative;
    cursor: pointer;
}

.theme-toggle-label:after {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background-color: var(--text-color);
    top: 1px;
    left: 1px;
    transition: transform 0.3s ease;
}

.theme-switch input {
    pointer-events: none;
    display: none;
}

.theme-switch input:checked+ .theme-toggle-label:after {
    transform: translateX(20px);
}