zotero/scss/mac/_tabbox.scss

tabbox {
	tabs {
		tab {
			appearance: none;
			// Since the tab with opacity is weird, we just use hard-coded colors
			@include light-dark(background, #ededed, #343434);
			--tabbox-tab-shadow:
				0px 2px 2px -2px var(--fill-quarternary) inset,
				0px -2px 2px -2px var(--fill-quarternary) inset,
				0px 4px 4px -4px var(--fill-quinary) inset,
				0px -4px 4px -4px var(--fill-quinary) inset;
			--tabbox-tab-shadow-left:
				2px 0px 2px -2px var(--fill-quarternary) inset,
				4px 0px 4px -4px var(--fill-quinary) inset;
			--tabbox-tab-shadow-right:
				-2px 0px 2px -2px var(--fill-quarternary) inset,
				-4px 0px 4px -4px var(--fill-quinary) inset;
			
			box-shadow: var(--tabbox-tab-shadow);

			&::before {
				content: "";
				height: 14px;
				top: 5px;
				border-left: 1px solid var(--fill-quarternary);
			}

			&:first-of-type {
				border-start-start-radius: 6px;
				border-end-start-radius: 6px;
				
				&::before {
					display: none;
				}

				&:-moz-locale-dir(ltr) {
					box-shadow:
						var(--tabbox-tab-shadow),
						var(--tabbox-tab-shadow-left);
				}
				&:-moz-locale-dir(rtl) {
					box-shadow:
						var(--tabbox-tab-shadow),
						var(--tabbox-tab-shadow-right);
				}
			}

			&:last-of-type {
				border-start-end-radius: 6px;
				border-end-end-radius: 6px;
				&:-moz-locale-dir(ltr) {
					box-shadow:
						var(--tabbox-tab-shadow),
						var(--tabbox-tab-shadow-right);
				}
				&:-moz-locale-dir(rtl) {
					box-shadow:
						var(--tabbox-tab-shadow),
						var(--tabbox-tab-shadow-left);
				}
			}

			&[visuallyselected=true] {
				/* fx115: toolkit/themes/osx/global/tabbox.css sets selected tabs' text color to #FFF, which is incorrect */
				&:not(:-moz-window-inactive) {
					color: unset;
				}

				& + tab {
					&::before {
						border-color: transparent;
					}
				}

				&::before {
					border-color: transparent;
				}

				.tab-middle {
					border-radius: 5px;
					background: var(--material-button);
					box-shadow:
						0px 1px 0.75px 0px var(--fill-quinary),
						0px 0.25px 0.25px 0px var(--color-border);;
					border: 0.5px solid var(--fill-senary);
					padding: 0.5px 6px 0.5px;
					margin: 0px -0.5px 1px -0.5px;
				}
			}
		}
	}
	tabpanels {
		appearance: none;
		background: var(--color-sidepane);
		border: 1px solid var(--fill-quinary);
		border-radius: 5px;
	}
}