zotero/scss/win/abstracts/_mixins.scss

@mixin windows-form-element-base {
	appearance: none;
	padding: 0;
	border: 1px solid transparent !important;
	border-radius: 4px;

	background-origin: border-box;
	background-clip: padding-box, padding-box, border-box;
	// Overwrite default background color
	background-color: unset !important;
	// Simulate linear-gradient border with border-radius using background-image

	@include light-dark(--color-form-element-background, var(--color-background70), var(--fill-quinary));
	@include light-dark(--color-form-element-border,
		linear-gradient(180deg, rgba(0, 0, 0, 0.0578) 90.58%, rgba(0, 0, 0, 0.1622) 100%),
		linear-gradient(180deg, rgba(255, 255, 255, 0.093) 0%, rgba(255, 255, 255, 0.0698) 9.57%));

	background-image:
		linear-gradient(var(--color-form-element-background), var(--color-form-element-background)),
		// Must be non-transparent color
		linear-gradient(var(--color-form-element-base-background), var(--color-form-element-base-background)),
		var(--color-form-element-border),
}

@mixin windows-form-element-hover {
	@include light-dark(--color-form-element-background, var(--color-background50), var(--fill-quarternary));
}

@mixin windows-form-element-active {
	@include light-dark(--color-form-element-background, rgba(255, 255, 255, 0.3), var(--fill-senary));
	--color-form-element-border: linear-gradient(var(--fill-quinary), var(--fill-quinary));
}

@mixin windows-form-element {
	height: 28px;

	@include windows-form-element-base;

	&:not([disabled]) {
		&:hover {
			@include windows-form-element-hover;
		}
	
		&:active {
			@include windows-form-element-active;
		}
	
		@include focus-ring;
	}

	&:disabled,
	&[disabled] {
		@include windows-form-element-active;
	}
}