:root {
    --col01: #1f2230;
    --col02: #f6f6f2;
    --col03: #f7b7a3;
    --col04: #4a5168;
    --col05: #99a2bd;
    --col06: #ff8f8f;
    --border: solid 2px var(--col04);
    --panel-width: min(42rem, 100%);
}

* {
    box-sizing: border-box;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background: var(--col01);
    color: var(--col02);
    display: flex;
    flex-direction: column;
    gap: 2rem;
    max-width: 1280px;
    padding: 0 1.5rem 2rem;
    margin: 0 auto;
    line-height: 1.5;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    padding-top: 1.5rem;
}

h1 {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    text-align: center;
    margin: 0;
}

.intro-copy {
    width: var(--panel-width);
    margin: 0;
    text-align: center;
    color: var(--col05);
}

.sliderPanel {
    width: var(--panel-width);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.sliderGroup {
    background: rgba(255, 255, 255, 0.04);
    border: var(--border);
    border-radius: 1rem;
    padding: 1rem 1rem 0.9rem;
}

.sliderLabelRow {
    display: grid;
    grid-template-columns: 2rem 1fr 2rem;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.sliderLabelRow label {
    font-weight: 700;
    letter-spacing: 0.02em;
}

.sliderEnd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.sliderCaption {
    margin: 0.65rem 0 0;
    color: var(--col05);
    font-size: 0.95rem;
}

/* Slider styling kept simple and consistent so the controls work clearly in both Chrome and Firefox. */
input[type="range"] {
    --range-progress: 50%;
    appearance: none;
    -webkit-appearance: none;
    width: 100%;
    height: 0.75rem;
    border-radius: 999px;
    cursor: pointer;
    background: linear-gradient(
        to right,
        var(--col03) 0%,
        var(--col03) var(--range-progress),
        var(--col04) var(--range-progress),
        var(--col04) 100%
    );
}

input[type="range"]:focus-visible {
    outline: 2px solid var(--col03);
    outline-offset: 4px;
}

input[type="range"]::-webkit-slider-runnable-track {
    height: 0.75rem;
    background: transparent;
    border-radius: 999px;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    -webkit-appearance: none;
    width: 1.3rem;
    height: 1.3rem;
    border-radius: 50%;
    border: 2px solid var(--col01);
    background: var(--col02);
    margin-top: -0.275rem;
}

input[type="range"]::-moz-range-track {
    height: 0.75rem;
    background: var(--col04);
    border-radius: 999px;
}

input[type="range"]::-moz-range-progress {
    height: 0.75rem;
    background: var(--col03);
    border-radius: 999px;
}

input[type="range"]::-moz-range-thumb {
    width: 1.3rem;
    height: 1.3rem;
    border-radius: 50%;
    border: 2px solid var(--col01);
    background: var(--col02);
}

.keyboardContainer {
    width: min(30rem, 100%);
}

/* Intro dialog */
dialog[open] {
    margin: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    background: var(--col02);
    color: var(--col01);
    border: none;
    border-radius: 1rem;
}

#dialog-close-button {
    border: none;
    border-radius: 999px;
    padding: 0.7rem 1rem;
    background: var(--col01);
    color: var(--col02);
    cursor: pointer;
}

@media (max-width: 640px) {
    body {
        padding: 0 1rem 2rem;
    }

    .sliderLabelRow {
        grid-template-columns: 1.6rem 1fr 1.6rem;
        gap: 0.5rem;
    }

    .sliderLabelRow label {
        font-size: 0.98rem;
    }

    .sliderCaption {
        font-size: 0.9rem;
    }
}