/*
 * 16 February 2022
 * Range Slider Progress in Chrome with pure CSS
 *
 * === This CodePen demonstrates how we can implement range slider "progress fill" in Webkit browsers using a `clip-path` and a `box-shadow` ===
 *
 * === There is an open issue about Standardizing input[type="range"] styling (https://github.com/w3c/csswg-drafts/issues/4410). For all I know, it hasn't been implemented yet ===
 *
 * === This demo is meant for Chrome browsers. But it'll also work in Firefox because Firefox provides the `::-moz-range-progress` pseudo-class ===
 *
 * more info. in the details view
 *
 */

/*html,
body {
        height: 100%;
}

* {
        padding: 0;
        margin: 0;
        box-sizing: border-box;
}

body {
        display: grid;
        place-items: center;
}

main {
        display: flex;
        flex-direction: column;
        gap: 2.2em;
        padding: 1em 0;
}

html::before {
        content: "";
        position: fixed;
        left: 0;
        top: 0;
        width: 100vw;
        height: 100vh;
        background: radial-gradient(circle at center, #fff, #fafafa);
        display: block;
}*/

/* === range theme and appearance === */
input[type="range"] {
        font-size: 1.5rem;
        width: 12.5em;
}

input[type="range"] {
        color: #ffff;
        --thumb-height: 1.125em;
        --track-height: 0.125em;
        --track-color: rgba(0, 0, 0, 0.2);
        --brightness-hover: 180%;
        --brightness-down: 80%;
        --clip-edges: 0.125em;
}

        input[type="range"].win10-thumb {
                color: #ffff;
                --thumb-height: 1.375em;
                --thumb-width: 0.5em;
                --clip-edges: 0.0125em;
        }

@media (prefers-color-scheme: dark) {
        html {
                background-color: #000;
        }

                html::before {
                        background: radial-gradient(circle at center, #101112, #000);
                }

        input[type="range"] {
                color: #ffff;
                --track-color: rgba(255, 255, 255, 0.1);
        }

                input[type="range"].win10-thumb {
                        color: #ffff;
                }
}

/* === range commons === */
input[type="range"] {
        position: relative;
        background: #fff0;
        overflow: hidden;
}

        input[type="range"]:active {
                cursor: grabbing;
        }

        input[type="range"]:disabled {
                filter: grayscale(1);
                opacity: 0.3;
                cursor: not-allowed;
        }

        /* === WebKit specific styles === */
        input[type="range"],
        input[type="range"]::-webkit-slider-runnable-track,
        input[type="range"]::-webkit-slider-thumb {
                -webkit-appearance: none;
                transition: all ease 100ms;
                height: var(--thumb-height);
        }

                input[type="range"]::-webkit-slider-runnable-track,
                input[type="range"]::-webkit-slider-thumb {
                        position: relative;
                }

                input[type="range"]::-webkit-slider-thumb {
                        --thumb-radius: calc((var(--thumb-height) * 0.5) - 1px);
                        --clip-top: calc((var(--thumb-height) - var(--track-height)) * 0.5 - 0.5px);
                        --clip-bottom: calc(var(--thumb-height) - var(--clip-top));
                        --clip-further: calc(100% + 1px);
                        --box-fill: calc(-100vmax - var(--thumb-width, var(--thumb-height))) 0 0 100vmax currentColor;
                        width: var(--thumb-width, var(--thumb-height));
                        background: url('speaker-thumb.png');  
                        /*linear-gradient(currentColor 0 0) scroll no-repeat left center / 50% calc(var(--track-height) + 1px);*/
                        background-color: currentColor;
                        box-shadow: var(--box-fill);
                        border-radius: var(--thumb-width, var(--thumb-height));
                        filter: brightness(100%);
                        clip-path: polygon( 100% -1px, var(--clip-edges) -1px, 0 var(--clip-top), -100vmax var(--clip-top), -100vmax var(--clip-bottom), 0 var(--clip-bottom), var(--clip-edges) 100%, var(--clip-further) var(--clip-further) );
                }

                input[type="range"]:hover::-webkit-slider-thumb {
                        filter: brightness(var(--brightness-hover));
                        cursor: grab;
                }

                input[type="range"]:active::-webkit-slider-thumb {
                        filter: brightness(var(--brightness-down));
                        cursor: grabbing;
                }

                input[type="range"]::-webkit-slider-runnable-track {
                        background: linear-gradient(var(--track-color) 0 0) scroll no-repeat center / 100% calc(var(--track-height) + 1px);
                }

                input[type="range"]:disabled::-webkit-slider-thumb {
                        cursor: not-allowed;
                }

                /* === Firefox specific styles === */
                input[type="range"],
                input[type="range"]::-moz-range-track,
                input[type="range"]::-moz-range-thumb {
                        appearance: none;
                        transition: all ease 100ms;
                        height: var(--thumb-height);
                }

                        input[type="range"]::-moz-range-track,
                        input[type="range"]::-moz-range-thumb,
                        input[type="range"]::-moz-range-progress {
                                background: #fff0;
                        }

                        input[type="range"]::-moz-range-thumb {
                                background: currentColor;
                                border: 0;
                                width: var(--thumb-width, var(--thumb-height));
                                border-radius: var(--thumb-width, var(--thumb-height));
                                cursor: grab;
                        }

                        input[type="range"]:active::-moz-range-thumb {
                                cursor: grabbing;
                        }

                        input[type="range"]::-moz-range-track {
                                width: 100%;
                                background: var(--track-color);
                        }

                        input[type="range"]::-moz-range-progress {
                                appearance: none;
                                background: currentColor;
                                transition-delay: 30ms;
                        }

                        input[type="range"]::-moz-range-track,
                        input[type="range"]::-moz-range-progress {
                                height: calc(var(--track-height) + 1px);
                                border-radius: var(--track-height);
                        }

                        input[type="range"]::-moz-range-thumb,
                        input[type="range"]::-moz-range-progress {
                                filter: brightness(100%);
                        }

                        input[type="range"]:hover::-moz-range-thumb,
                        input[type="range"]:hover::-moz-range-progress {
                                filter: brightness(var(--brightness-hover));
                        }

                        input[type="range"]:active::-moz-range-thumb,
                        input[type="range"]:active::-moz-range-progress {
                                filter: brightness(var(--brightness-down));
                        }

                        input[type="range"]:disabled::-moz-range-thumb {
                                cursor: not-allowed;
                        }