zotero/scss/elements/_quickSearchTextbox.scss

// | 6px padding | 16px icon width | 2px padding | 8px dropmarker width | 4px padding |
quick-search-textbox {
	--search-textbox-width: 146px;
	font-size: var(--zotero-font-size);
	margin-right: 0;
	width: var(--search-textbox-width);
	height: 28px;
	max-width: 300px;
	flex-grow: 1;

	// Let the wrapper shrink below its content width when the items pane is squeezed (e.g., by a
	// wide item pane). Otherwise it keeps its intrinsic width and overflows to the right, pushing
	// the trailing Advanced Search button out under the item pane where it's clipped.
	#search-wrapper {
		min-width: 0;
	}

	// While the Advanced Search indicator is shown, size this element to the indicator's content
	// (full label + buttons) rather than the 146px quick-search width, and allow shrinking below
	// it (min-width: 0) only when the toolbar overflows -- so the label stays full on a normal
	// window and crops just enough on a narrow one, keeping the buttons to its right (collapse/
	// close and the stacked item-pane toggle) unclipped. The normal search box keeps its default
	// size (it isn't shown then).
	&[advanced-search-open] {
		width: auto;
		min-width: 0;
		// Take only the indicator's width (don't grow toward max-width), so the buttons sit right
		// after the label and the toggle isn't pushed out; the toolbar's spacer absorbs the slack
		flex-grow: 0;

		// A XUL <deck> sizes to its largest panel and doesn't clamp the panel to the deck's
		// width, so the indicator keeps its full width and overflows. Since only the indicator
		// is shown while advanced search is open, lay the deck out as flex and let the indicator
		// (and its label) shrink, hiding the inactive quick-search panel.
		#search-deck {
			min-width: 0;
			display: flex;
		}

		#search-wrapper {
			display: none;
		}

		#advanced-search-indicator {
			flex: 1;
			min-width: 0;
		}
	}

	*[zoteroFontSize=small] {
		font-size: 11px;
	}

	:is(search-textbox, query-textbox)::part(search-sign),
	:is(search-textbox, query-textbox)::part(search-icon) {
		@include svgicon-menu("magnifier", "universal", "16");
		color: var(--fill-secondary);
		// right: 4px gap + 2px padding + 8px dropmarker width + 4px padding
		// left, top, and bottom: 5px padding (6px on Figma, including 1px search-textbox border)
		// Use explicit left/right padding here because this element is flipped in RTL (see _search.scss)
		padding: 5px 18px 5px 5px;
		margin: 0;
	}

	:is(search-textbox, query-textbox)::part(search-input) {
		padding: 0;
	}
}

#zotero-tb-search {
	height: 100%;
}

#zotero-tb-search-dropmarker {
	position: relative;
	// 6px padding + 16px icon width + 2px padding + 8px dropmarker width + 4px padding
	width: 36px;
	margin-inline-end: -36px;
	z-index: 2;
}

#zotero-tb-search-menu-button {
	width: 36px;
	height: 28px;
	min-height: 28px;
	padding-block: 0;
	// inline-start: 6px padding + 16px icon width + 2px padding - 1px outer border
	padding-inline: 23px 4px !important;
	margin: 0;
	border: 0;
	border-radius: 5px;
	appearance: none;
	min-width: 0;
	cursor: default;
	@include svgicon-menu("chevron-6", "universal", "8");
	color: var(--fill-secondary);
	background: transparent;

	@include focus-ring;

	.button-menu-dropmarker {
		display: none; /* Hide automatic dropmarker */
	}
}

#zotero-tb-search-textbox {
	padding: 0;
	padding-inline-end: 6px;
	margin: 0;
	position: relative;
	inset-inline-start: 0;
	width: var(--search-textbox-width);
	height: 28px;
	z-index: 1;
	width: 100%;

	// Keep input text and the clear icon out from under the Advanced Search button
	&:has(~ #zotero-tb-search-advanced-button) {
		padding-inline-end: 30px;
	}
}

// Match the specificity of the #zotero-items-toolbar toolbarbutton rules
#zotero-tb-search #zotero-tb-search-advanced-button {
	position: relative;
	width: 28px;
	height: 28px;
	min-width: 0;
	margin: 0;
	margin-inline-start: -28px;
	margin-inline-end: 2px;
	padding: 0;
	z-index: 2;
	@include svgicon-menu("filter", "universal", "16");
	color: var(--fill-secondary);

	@include focus-ring;

	// Show the hover effect on a chip around the icon, inset within the field,
	// rather than on the whole button
	&:hover, &:active {
		background-color: transparent;
	}

	.toolbarbutton-icon {
		width: 24px;
		height: 24px;
		// The glyph is weighted slightly to the right within the SVG, so shift it
		// a pixel left to optically center it (physical sides -- doesn't flip in RTL)
		padding: 5px 6px 5px 4px;
		border-radius: 4px;
		// The button is 4px wider than the chip and left-aligns it, which puts the
		// focus ring off-center; shift the chip 2px to center it within the button
		margin-inline-start: 2px;
	}

	&:hover .toolbarbutton-icon {
		background-color: var(--fill-quinary);
	}

	&:active .toolbarbutton-icon {
		background-color: var(--fill-quarternary);
	}
}

#zotero-tb-search-spinner {
	margin: 0 8px;
	// make sure the spinner always occupies space
	display: inline;
	visibility: hidden;
}

#search-deck {
	width: 100%;
}

#search-wrapper {
	align-items: center;
}

#advanced-search-indicator {
	gap: 8px;
	align-items: center;
	
	// Cover the inline-end toolbar padding and the existing bottom border
	margin-inline-end: -$toolbar-padding-inline;
	padding-inline: $toolbar-padding-inline;
	margin-bottom: -1px;
	
	background: var(--material-toolbar);
	border-inline-start: var(--material-border);

	// Prevent text from shifting when border shows after panel is collapsed
	border-block: var(--material-border-transparent);
	
	// This is styled like it's part of the Advanced Search panel, which can't drag the window,
	// so match that behavior
	-moz-window-dragging: no-drag;

	& > label {
		flex: 1;
		// Let the label shrink and crop on a narrow window so the collapse/close buttons to its
		// right stay visible
		min-width: 0;
		padding-inline: 4px;
		font-weight: 700;
	}

	.zotero-clicky {
		width: 28px;
		height: 28px;
		margin: 0;
		padding: 4px;
	}
	
	.advanced-collapse-button {
		@include svgicon-menu("minimize", "universal", "20");
	}
	
	.advanced-close-button {
		@include svgicon-menu("x", "universal", "20");
		// Inset to match the filter button's chip in the closed state (it sits 2px
		// in from the field edge), so the edge doesn't shift when toggling between
		// the search field and this header
		margin-inline-end: 2px;
	}

	&[data-collapsed="true"] {
		border-bottom: var(--material-border);
		
		.advanced-collapse-button {
			@include svgicon-menu("maximize", "universal", "20");
		}
	}
}