/*
 * 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
 *
 */
/* === range theme and appearance === */
input[type="range"] {
	font-size: 1.5rem;
	width: calc(300px - 1.75em);
}

input[type="range"] {
	color: var(--secondary-color-bright);
	--thumb-height: 0.75em;
	--thumb-width: 0.2em;
	--track-height: 0.75em;
	/* --track-color: linear-gradient(0deg, #C6D7F7, #FDFDFD, #C6D7F7); */
	--track-color: #00000000;
	--brightness-hover: 150%;
	--brightness-down: 70%;
	--clip-edges: 0em;
}

/* === range commons === */
input[type="range"] {
	position: relative;
	background: #fff0;
	overflow: hidden;
	outline: 3px solid var(--secondary-color);
}

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);
	border-radius: 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 - 0.3em) 0 0
		100vmax currentColor;

	/* width: var(--thumb-width, var(--thumb-height)); */
	/* border-radius: var(--thumb-width, var(--thumb-height)); */
	width: var(--thumb-height);
	border-radius: 0 100% 100% 0;
	border: none;
	background: linear-gradient(currentColor 0 0) scroll no-repeat left center /
		50% calc(var(--track-height) + 1px);
	background-color: currentColor;
	box-shadow: var(--box-fill);
	
	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: var(--track-color) 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-height);
	border-radius: 0 100% 100% 0;
	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: 0;
}

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;
}