:root {
    --color-activated: #533E4C;
    --color-body: #F0EBE9;
    --color-button: #9D695A;
    --color-deactivated: #bbbbbb;
    --color-game: #2c3e50;
    --color-green: #26d971;
    --color-input: #34495e;
    --color-red: #e74c3c;
    --color-text: white;

    --english-font-family:
            "Lato",
            "Helvetica Neue",
            Helvetica,Arial,
            sans-serif;
    --japanese-font-family:
            "ヒラギノ角ゴ Pro W3",
            "Hiragino Kaku Gothic Pro",
            Osaka,
            "メイリオ",
            Meiryo,
            "ＭＳ Ｐゴシック",
            "MS PGothic",
            sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-body);
    box-sizing: border-box;
    font: 1rem var(--english-font-family);
    text-align: center;
    text-rendering: optimizeLegibility;
}

.github-link {
    text-align: right;
}
    .github-link a {
        color: var(--color-game);
        text-decoration: none;
    }
    .github-link svg {
        height: 2rem;
    }

.main-container {
    position: absolute;
    top: 5%; right: 0; bottom: 0; left: 0;
    padding-bottom: 10vh;
    width: 100%;
    will-change: transform;
}

.title {
    margin: 2vh;
    color: var(--color-game);
    font-size: 60px;
    font-weight: 255;
}

.play-configurations {
    margin-inline: 5em;
    transition: transform 1.0s ease-in-out;
}

    .main-container[centered=true] .play-configurations {
        transform: translateX(calc(-50vw + 2.5em));
    }

.play-configurations button {
    background: var(--color-button);
    border: 1px solid transparent;
    border-radius: 0.25em;
    color: var(--color-text);
    font-size: 1.15em;
    margin: 0.25em;
    padding: 0.5em;
    text-align: center;
}

.kana-selection-container {
    display: grid;
    justify-content: center;
    grid-auto-flow: row;
}

    .kana-selection-container button {
        background: var(--color-deactivated);
        border: 1px solid transparent;
        border-radius: 0.25em;
        color: var(--color-text);
        font-size: 2.25vw;
        margin: 0.125em;
        padding: 0.1em 0.3em;
        text-align: center;
        transition: background-color 150ms ease-in-out;
    }

        .kana-selection-container button:focus {
            outline: none;
            box-shadow: none;
        }

        .kana-selection-container button:hover {
            cursor: pointer;
        }

        .kana-selection-container button[active] {
            background: var(--color-activated);
        }

        .kana-selection-container button[void] {
            color: transparent;
            cursor: initial;
            background: transparent;
        }

        .kana-selection-container button.checkbox {
            background: transparent;
            color: var(--color-deactivated);
            padding: 0.2em;
        }

        .kana-selection-container button.checkbox[active] {
            color: var(--color-activated);
        }

        .kana-selection-container button.checkbox svg {
            aspect-ratio: 1;
            width: 0.8em;
        }

        .kana-selection-container button.syllabary-title {
            font-size: 38px;
            margin: 20px 0;
            padding: 0.25em 0;
            width: 100%;
        }

        .kana-selection-container button.chart-title {
            font-size: 25px;
            margin: 20px 0;
            padding: 0.35em 0 0.25em;
            width: 100%;
        }

        .kana-syllabary {
            margin: 0 5em;
        }

        .kana-chart-collection {
            margin: 0 2em;

            display: grid;
            justify-content: center;
            grid-auto-flow: column;
            grid-gap: 20px;
        }

        .kana-row {
            margin-right: .5em;

            display: grid;
            justify-content: center;
            grid-auto-flow: column;
        }

        .kana-row button {
            font-family: var(--japanese-font-family)
        }

/* ======================================== Game Screen ======================================== */

.kana-line {
    font: 60px var(--japanese-font-family);
    background-color: var(--color-game);
    color: var(--color-text);
    height: 2em;
    overflow: hidden;
    text-align: left;
    width: 100vw;
}

.kana-line-container {
    margin-left: 50vw;
}

.kana-line-scroll-container {
    padding-top: 10px;
    will-change: transform;
}

    .kana-line-scroll-container > span {
        display: inline-block;
        position: relative;
        text-align: center;
        top: 0.4em;
    }

    .kana-line-scroll-container > span.red {
        color: var(--color-red);
        position: relative;
    }

    .kana-line-scroll-container > span.green {
        color: var(--color-green);
    }

    /* Turn all the white contents, except for the first, gray */
    .kana-line-scroll-container > span.white ~ span.white {
        color: var(--color-deactivated)
    }


    .kana-line-scroll-container > span > .small-above {
        font-size: 0.4em;
        position: absolute;
        left: 0;
        right: 0;
        transform: translateY(-50%);
    }

.romanji-line {
    box-shadow: 0 0.5em 0.75em -0.8em black;
    position: relative;
    width: 100vw;
    z-index: 2;
}

    .romanji-line > input {
        background-color: var(--color-input);
        border: none;
        border-radius: 0;
        color: var(--color-text);
        font-size: 24px;
        margin: 0;
        padding: 0;
        text-align: center;
        width: 100vw;
        -webkit-appearance: none;
    }

        .romanji-line > input:focus {
            outline: none;
        }



.metrics-container {
    display: grid;
    grid-auto-columns: minmax(0, max-content) fit-content(20%);
    grid-auto-flow: column;
    grid-gap: 0;
    justify-content: center;
}

    .metrics-container > div {
        color: var(--color-text);
        background-color: var(--color-game);
        font: 24px sans-serif;
        height: 2em;
        padding-top: 0.1em;
        width: 8em;

        display: grid;
        grid-auto-columns: minmax(0, max-content);
        grid-auto-flow: column;
        align-content: center;
        justify-content: center;
    }

    .metrics-container > div:first-of-type {
        border-radius: 0 0 0 1ch;
    }

    .metrics-container > div:last-of-type {
        border-radius: 0 0 1ch 0;
    }

    .metrics-container > div > svg {
        aspect-ratio: 1;
        height: 1em;
        margin-top: -0.1em;
    }

    .metrics-container .clock {
        grid-gap: 0.5em;
    }

    .metrics-container .score {
        grid-gap: 0.2em;
        grid-template-columns: min-content 4ch min-content 4ch;
    }

        .metrics-container .score .score-number:first-of-type {
            text-align: right;
        }
        .metrics-container .score .score-number:last-of-type {
            text-align: left;
        }


/* ======================================== Animations ======================================== */

[centered=true] {
    transform: translateY(calc(20vh - 5em));
    transition: transform 1s ease-in-out;
}

[centered=false] {
    transition: transform 1s ease-in-out;
}

[state=Hidden] {
    animation: fade-out 1s ease-in 0s;
}

    @keyframes fade-out {
        from {
            opacity: 1;
        }
        to {
            opacity: 0;
        }
    }

[state=Visible] {
    animation: fade-in 1s ease-in;
}

    @keyframes fade-in {
        from {
            opacity: 0;
        }
        to {
            opacity: 1;
        }
    }

/* =================================== Mobile Compatibility =================================== */

@media only screen and (max-width: 768px) {

    /* Resize the buttons to better fit on the smaller screen. */
    .kana-selection-container button {
        font-size: 6.25vw;
    }

    /* Resize the width of the full screen buttons to fit within the smaller screen. */
    .kana-selection-container button.syllabary-title {
        width: min(100%, calc(100vw - 20px));
    }

    /* Align the Kana charts into rows so the buttons can be scaled up. */
    .kana-chart-collection {
        grid-auto-flow: row;
    }

    .kana-line {
        font-size: 10vw;
    }

    .metrics-container > div {
        font-size: 4.5vw;
    }
}

@media only screen and (max-height: 768px) {
    .kana-line {
        font-size: 10vh;
    }

    .metrics-container > div {
        font-size: 1em;
    }
}