:root {
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.75rem;
    --space-xl: 2rem;

    --radius: 7px;
    --radius-pill: 2rem;
    --line-width: 75px;
    --thumb-size: clamp(1rem, calc(1.5rem + 1.18vw), 2.88rem);
    --track-width: clamp(14rem, calc(8.18rem + 10vw), 21rem);

    --font-base: 1.5rem;
    --font-fraction: 2rem;
    --font-label: 1.5rem;
    --font-button: 2rem;

    --color-bg-canvas: #fff;
    --color-bg-fraction-main: #f672f1;
    --color-bg-fraction-card: #07e2bd;
    --color-bg-range-track: #9e9e9e;
    --color-bg-input: #cdebf7;
    --color-bg-muted-btn: rgba(39, 20, 84, 0.74);
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #665;
    --color-text-button: #41403e;
    --color-accent-loader: #f03355;
    --color-border-light: rgba(255, 255, 255, 1);
    --color-shadow-grey: grey;
    --color-shadow-brown: brown;

    --shadow-card: 0 0 4px rgba(0, 0, 0, 0.2);
    --shadow-inset-subtle: inset 0 0 1px 4px #d7d8d8;
    --shadow-inset-card: inset 0 0 5px rgba(138, 70, 20, 0.4);
    --shadow-elevated: 0 2px 1px rgba(0, 0, 0, 0.13), 0 4px 2px rgba(0, 0, 0, 0.06), 0 8px 4px rgba(0, 0, 0, 0.06), 0 16px 8px rgba(0, 0, 0, 0.06);
    --shadow-button: 15px 28px 25px -18px rgba(0, 0, 0, 0.2);
    --shadow-thumb: 0 -1px 5px 4px rgba(255, 255, 255, 0.47) inset, 0 1px 1.5px rgba(0, 0, 0, 0.27), 0 2px 5px rgba(0, 0, 0, 0.2), 0 5px 9px rgba(0, 0, 0, 0.13);

    --transition-fast: 235ms ease-in-out;

    --line_width: 75px
}

.main-container {
    display: flex;
    justify-content: center;
    align-items: center;
    max-height: 650px;
    max-width: 700px;
    margin: var(--space-md) auto;
    border-radius: var(--radius);
    -webkit-user-select: none;
    position: relative;
    box-shadow: var(--shadow-card);
    user-select: none;
}

#canvas {
    width: 100%;
    background-color: var(--color-bg-canvas);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius);
}

img {
    border-radius: var(--radius);
}

.fraction-main {
    display: flex;
    justify-content: space-evenly;
    width: 100%;
    background-color: var(--color-bg-fraction-main);
    border-radius: var(--radius);
    box-shadow: var(--shadow-inset-subtle);
}

.fraction-card .fraction {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.fraction-card {
    display: none;
    position: absolute;
    top: 0;
    gap: 10px;
    align-items: center;
    padding: var(--space-lg);
    font-size: var(--font-fraction);
    text-shadow: 0 0 2px #fff;
    color: var(--color-text-primary);
    border-radius: var(--radius);
    background-color: var(--color-bg-fraction-card);
    box-shadow: var(--shadow-inset-card);
    margin: var(--space-md) 0;
}

.fraction-card_value {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.fraction-card_numerator,
.fraction-card_denominator {
    font-weight: 700;
    font-size: 1.25rem
}

.fraction-card_line {
    width: var(--line_width);
    border-top: 4px solid var(--color-text-primary)
}

.fraction-card .fraction-card__simplified {
    display: none;
    color: var(--color-text-secondary);
    font-size: 0.9em;
    text-shadow: 0 1px #010010;
}

.fraction-card p {
    margin: 0
}

.label {
    font-size: var(--font-label);
    font-weight: bolder;
    text-shadow: 0 0 2px #fff;
}

/* Range slider */

.range-group {
    display: flex;
    flex-direction: column;
    inline-size: fit-content;
    aspect-ratio: 10.665/1;
    position: relative;
    padding-inline: var(--space-xs);
    border: 0;
    border-radius: var(--radius-pill);
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0.6), transparent, #d9d5e6, rgba(0, 0, 0, 0.07), var(255, 255, 255, 0.6));
    box-shadow: var(--shadow-elevated);
}

.range-wrapper {
    display: flex;
    align-items: center;
    flex-direction: column
}

.range {
    pointer-events: auto;
    writing-mode: vertical-rl;
    direction: rtl;
    place-self: center;
    border-radius: 100vh;
    width: min(1rem, 5vw);
    height: calc(var(--track-width) - 1.5rem);
    background-color: var(--color-bg-range-track);
    box-shadow: inset 0 2px 3px #0005, inset 0 -2px 2.5px .5px #fff3;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
    outline: 0;
}

.range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: var(--thumb-size);
    aspect-ratio: 1;
    border-radius: 50%;
    background: linear-gradient(to bottom, #fff 30%, #aaaeaf 75%, hsl(192deg 3% 46%));
    box-shadow: var(--shadow-thumb);
}

.range::-moz-range-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: var(--thumb-size);
    height: clamp(3rem, calc(2.28rem + 3.18vw), 3.88rem);
    aspect-ratio: 1;
    border-radius: 50%;
    background: linear-gradient(to bottom, #fff 30%, #aaaeaf 75%, hsl(192deg 3% 46%));
    box-shadow: var(--shadow-thumb);
}

.input-overlay {
    display: none;
    position: absolute;
    justify-items: center;
    align-items: center;
    padding: var(--space-md) var(--space-sm);
    border-radius: 10px;
    background-color: var(--color-bg-input);
    box-shadow: inset 0 0 5px grey;
    height: auto;
}

.input--numerator,
.input--denominator {
    box-shadow: inset 0 0 5px grey;
    background-color: var(--bg);
    padding: 1rem .5rem;
    border-radius: 10px;
    height: auto;
    display: none;
    position: absolute
}

.input--numerator {
    justify-items: center;
    align-items: center;
    left: 1%
}

.input--denominator {
    justify-items: center;
    align-items: center;
    right: 1%
}

/* Buttons */
.btn-sketchy {
    position: absolute;
    align-self: center;
    display: inline-block;
    padding: var(--space-md);
    border-radius: 255px 15px 225px/15px 225px 15px 255px;
    background-color: #fff;
    background-image: none;
    background-position: 0 90%;
    background-repeat: repeat no-repeat;
    background-size: 4px 3px;
    box-shadow: var(--shadow-button);
    color: var(--color-text-button);
    font-family: Neucha, sans-serif;
    border-style: solid;
    border-width: 2px;
    font-size: var(--font-button);
    box-sizing: border-box;
    font-weight: bolder;
    line-height: 23px;
    text-decoration: none;
    transition: var(--transition-fast);
    -webkit-user-select: none;
    user-select: none;
    touch-action: manipulation;
    cursor: pointer;
    outline: 0;
}

.btn-mute {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    margin: var(--space-xs);
    padding: var(--space-md);
    background-color: var(--color-bg-muted-btn);
}

/* Loader */
.loading {
    display: flex;
    align-items: center;
    flex-direction: column;
    position: absolute
}

.loading p {
    padding: 2rem;
    font-size: var(--font-base);
    font-weight: 700
}

.loader {
    width: 150px;
    aspect-ratio: 1;
    color: var(--color-accent-loader);
    background: conic-gradient(currentColor 0 270deg, #0000 0);
    border-radius: 50%;
    animation: 4s linear infinite loader-spin
}

.loader::before {
    content: "";
    display: block;
    height: 50%;
    width: 50%;
    border-top-left-radius: 100px;
    background: currentColor;
    animation: .5s infinite alternate loader-pulse
}

@keyframes loader-spin {

    0%,
    24.99% {
        transform: rotate(0)
    }

    25%,
    49.99% {
        transform: rotate(90deg)
    }

    50%,
    74.99% {
        transform: rotate(180deg)
    }

    100%,
    75% {
        transform: rotate(270deg)
    }
}

@keyframes loader-pulse {
    100% {
        transform: translate(-10px, -10px)
    }
}

@media (prefers-reduced-motion: reduce) {

    .loader,
    .loader::before {
        animation: none;
    }

    .btn-sketchy {
        transition: none;
    }
}

@media screen and (max-width:768px) {
    :root {
        --line_width: 50px
    }

    .fraction-card_line {
        border-top-width: 2px;
    }

    .fraction-card,
    .label {
        font-size: 1.25rem
    }
}

@media screen and (max-width:528px) {
    :root {
        --font-base: 1rem;
    }

    .label {
        padding: var(--space-xs);
        border-radius: var(--radius);
        background-color: var(--color-bg-input);
    }

    .fraction-card {
        padding: var(--space-md);
    }

    .fraction-card,
    .label {
        font-size: .75rem;
    }

    .input-overlay {
        pointer-events: none;
        background-color: unset;
        box-shadow: none;
        padding: var(--space-xs);
        height: 90%;
    }

    .loader {
        width: 70px;
    }

    .btn-mute {
        top: auto;
        bottom: 0;
        left: auto;
        font-size: 1rem;
        padding: var(--space-sm);
    }
}

@media screen and (max-width:528px) {

    .input--numerator,
    .input--denominator {
        pointer-events: none;
        background-color: unset;
        box-shadow: none;
        padding: .25rem;
        height: 90%
    }

    :root {
        --font: 1rem
    }

    .loader {
        width: 70px
    }

    .btn-mute {
        top: 100%;
        bottom: 0;
        font-size: 1rem;
        padding: .5rem;
        left: unset
    }
}