@font-face {
    font-family: 'Space Mono';
    font-style: normal;
    src: url('assets/fonts/SpaceMono-Bold.ttf') format('truetype');
    font-weight: 700;
}

:root {
    --green-400: hsl(172, 67%, 45%);
    --primary: var(--green-400);

    --green-900: hsl(183, 100%, 15%);
    --grey-500: hsl(186, 14%, 43%);
    --grey-400: hsl(184, 14%, 56%);
    --grey-200: hsl(185, 41%, 84%);
    --grey-50: hsl(189, 47%, 97%);

    --white: hsl(0, 100%, 100%);
    --error: hsl(8, 64%, 62%);
}

* {
    font-family: 'Space Mono', monospace;
}

.sr-only {
    position: absolute;
    width: .01em;
    height: .01em;
    padding: 0;
    margin: -.01em;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

body {
    font-family: 'Space Mono', monospace;
    font-weight: 700;
    background-color: var(--grey-200);
    margin: 0;
    padding: 0;
    display: grid;
    place-items: center;
    min-block-size: 100vh;
}

header {
    font-variant: small-caps;
    letter-spacing: .5em;
    color: var(--grey-500);
    line-height: 1;
}

main{
    display: contents;
}

form {
    display: flex;
    flex-direction: column;
    background-color: var(--white);
    border-radius: 1em;
    inline-size: 100%;
    max-inline-size: 57.5rem;

    @media screen and (min-width: 50rem) {
        flex-direction: row;
        ;
    }
}

.input {
    padding: 1em;
    border: none;
    color: var(--grey-500);
    display: flex;
    flex-direction: column;
    gap: 2em;
    flex-grow: 1;
}


/* form styles */
.form-group {
    display: grid;
    gap: 1em;

    &:has([aria-describedby]) {
        grid-template-columns: 1fr 1fr;

        & input {
            grid-column: 1/-1;

            &:not(:user-invalid)+.input-error {
                display: none;
            }
        }

        .input-error {
            grid-row: 1;
            grid-column: 2;
            justify-self: end;
            color: var(--error);
        }
    }
}

fieldset[role="radiogroup"] legend {
    grid-column: 1/-1;

    /* hack because legend is not a grid item that takes gap into account */
    margin-block-end: 1em;
}

.radio-group {
    --grid-max-col-count: 3;
    --grid-min-col-size: 7rem;
    --grid-gap: 1rem;

    --total-gap: calc(var(--grid-gap) * (var(--grid-max-col-count) - 1));

    --grid-col-size-calc: calc((100% - var(--total-gap)) / var(--grid-max-col-count));
    /* min of 100% to avoid overflow issues with a minimum width that's too wide */
    --grid-col-min-size-calc: min(100%, max(var(--grid-min-col-size), var(--grid-col-size-calc)));

    grid-template-columns: repeat(auto-fit, minmax(var(--grid-col-min-size-calc), 1fr));

    border: 0;
    padding: 0;
    margin: 0;

    & input:focus + label{
        background-color: var(--grey-200);
        color: var(--green-900);
    }

    & label {
        background-color: var(--green-900);
        color: var(--white);
        font-size: 1.5rem;
        padding: .5em;
        text-align: center;
        border-radius: .25em;
        cursor: pointer;

        &:hover {
            background-color: var(--grey-200);
            color: var(--green-900);
        }

        &.custom-tip{
            padding: 0;
        }
    }

    & :checked+label {
        background-color: var(--primary);
        color: var(--green-900)
    }

    input {
        text-align: center;

        &[type="text"] {
            inline-size: 100%;
            block-size: 100%;
        }
    }
}

button {
    background-color: var(--primary);
    color: var(--green-900);
    border-radius: .25em;
    border: none;
    padding: .5em;
    font-size: 1.5rem;
    font-weight: 700;
    cursor: pointer;

    &[type="reset"] {
        font-variant: small-caps;
        margin-block-start: auto;
    }
}

input {
    background-color: var(--grey-50);
    background-image: var(--icon-url);
    background-size: .5em;
    background-repeat: no-repeat;
    background-position: left .75em center;
    border: .125rem solid var(--grey-50);
    font-size: 1.5rem;
    padding: .25em;
    color: var(--green-900);
    text-align: end;
    border-radius: .25em;

    &:hover,
    &:focus-visible {
        border-color: var(--primary);
        outline: none;
        cursor: pointer;
    }

    &::placeholder {
        color: var(--grey-400);
    }

    &:user-invalid {
        border-color: var(--error);
    }

    &#bill {
        --icon-url: url('assets/images/icon-dollar.svg');
    }

    &#people {
        --icon-url: url('assets/images/icon-person.svg');
    }
}

.output {
    display: flex;
    flex-direction: column;
    padding: 1.5em;
    border: none;
    border-radius: 1em;
    background-color: var(--green-900);
    margin: 1em;
    color: var(--white);
    gap: 1em;
    flex-grow: 1;

    .form-group {
        grid-template-columns: 1fr 10ch;
        font-size: 1.5rem;
    }

    & label {
        font-size: .75em;
        line-height: 1.15;
        align-self: center;

        & span {
            font-size: .75em;
            color: var(--grey-400);
        }
    }

    & output {
        font-size: 2rem;
        color: var(--primary);
        justify-self: end;
    }
}

.wrapper {
    display: grid;
    gap: 1em;
    ;
    margin-block: 1em;
}