/**
 * OpenStation — Overview.
 *
 * Zoom-out grid view: windows transform into thumbnails, floating
 * labels sit above them, and a top bar lists every virtual desktop
 * with one tile per space plus a "+" to add a new one. The dock
 * collapses in parallel with the enter transition.
 *
 * Windows keep their `left/top/width/height` intact; only `transform`
 * animates (translate + scale) so the layout change is a GPU
 * composite, not a reflow. `transform-origin: top left` makes
 * translate + scale compose cleanly — a target coordinate maps to
 * the window's top-left corner pre-scale. Iframes go
 * `pointer-events: none` inside overview so clicks hit the window
 * wrapper (and bubble to the desktop-area click handler) instead of
 * the iframe content, which would otherwise eat the click.
 *
 * Base chrome lives in window-chrome.css; non-overview state classes
 * live in window-states.css.
 *
 * @since 6.9.0
 */
.os-area--overview {
	/* Darken the backdrop and tint it so windows feel like they're
	 * floating over a neutral canvas, not the wallpaper. */
	background-color: var( --os-ui-scrim, rgba( 0, 0, 0, 0.45 ) );
	transition: background-color 0.28s ease;
}

.os-window--overview {
	transform-origin: top left;
	transition:
		transform 0.28s cubic-bezier( 0.2, 0, 0.2, 1 ),
		box-shadow 0.2s ease,
		opacity 0.2s ease;
	cursor: pointer;
	/* Hover effects apply a thick outline rather than another
	 * transform (which would fight the layout's own transform).
	 * Box-shadow is composite-only, so it's cheap. */
	box-shadow: 0 10px 30px rgba( 0, 0, 0, 0.35 );
	/* Overview thumbnails are click targets, not reading surfaces —
	 * suppress text selection so a drag across a thumbnail doesn't
	 * highlight paragraphs inside the title bar / native body. */
	user-select: none;
	-webkit-user-select: none;
}

/*
 * While in overview, treat each window as a single click target —
 * every inner element (title bar, buttons, iframe, native body) goes
 * transparent to pointer events so drags/taps never start a drag,
 * trip a close button, or launch an in-iframe action. Only the
 * window's root element receives pointer events; our desktop-level
 * pointerdown/pointerup handlers drive selection from there.
 */
.os-window--overview * {
	pointer-events: none;
}

.os-window--overview {
	pointer-events: auto;
}

.os-window--overview:hover {
	box-shadow:
		0 14px 38px rgba( 0, 0, 0, 0.45 ),
		0 0 0 3px var( --wp-admin-theme-color, #2271b1 );
	z-index: 1;
}

/*
 * Minimized windows shown in overview are rendered slightly dimmed
 * so the user can distinguish them from active windows at a glance.
 */
.os-window--overview.os-window--minimized {
	opacity: 0.6;
}

/*
 * Mission-Control-style dimming: once ANY window is hovered, every
 * OTHER window dims and desaturates slightly — creating a clear
 * focal point without needing the hovered one to grow or lift.
 * `:has()` lands in every evergreen browser we target (Chrome 105,
 * Safari 15.4, Firefox 121+); older engines miss the dimming but
 * keep the accent-ring affordance, so it degrades gracefully.
 */
.os-area--overview:has( .os-window--overview:hover )
	.os-window--overview:not( :hover ) {
	opacity: 0.5;
	filter: brightness( 0.75 );
	transition:
		transform 0.28s cubic-bezier( 0.2, 0, 0.2, 1 ),
		opacity 0.18s ease,
		filter 0.18s ease;
}

/*
 * Dock slides out smoothly during overview — width collapses (the
 * flex row reflows so the area grows into the freed space) while
 * the dock itself slides left and fades. `display: none` would have
 * been abrupt in both directions; animating the flex width does the
 * heavy lifting and the user sees a single continuous motion.
 *
 * `pointer-events: none` comes in immediately on overview enter so
 * stray clicks mid-animation can't open a window behind the user's
 * back. `overflow: hidden` is scoped to the collapsed state so the
 * shrinking dock doesn't leak icons past its boundary — outside
 * overview, the dock keeps `overflow: visible` from dock.css so
 * per-tile "+ open another" chips can float past the edge.
 */
.os-dock {
	transition:
		width 0.28s cubic-bezier( 0.2, 0, 0.2, 1 ),
		min-width 0.28s cubic-bezier( 0.2, 0, 0.2, 1 ),
		padding 0.28s cubic-bezier( 0.2, 0, 0.2, 1 ),
		transform 0.28s cubic-bezier( 0.2, 0, 0.2, 1 ),
		opacity 0.22s ease;
}

/*
 * Collapse EVERY dock (bottom + side rails, Classic / Unified /
 * Spatial layouts alike) when overview is active.
 *
 * The placement-specific width rules in dock.css —
 * `.os-dock[ data-os-dock-placement="left" ]
 *  { width: var( --os-dock-width ); }` — share equal
 * specificity with `.os-shell--overview .os-dock`
 * (two classes / class+attr) and load LATER in the cascade, so
 * without `!important` the side rail keeps its placement width
 * and stays visible during overview. The bottom dock happens to
 * lack a placement-attr-keyed width override so it collapsed
 * fine; the side rail did not — caught by the regression
 * screenshot.
 *
 * `!important` is the right tool here: this rule is a transient,
 * mode-scoped override (overview screen only) of a layout-mode
 * default, and we want it to win unconditionally.
 */
.os-shell--overview .os-dock,
.os-shell--overview #os-side-dock {
	width: 0 !important;
	min-width: 0 !important;
	padding-inline: 0 !important;
	padding-block: 0 !important;
	transform: translateX( -16px );
	opacity: 0;
	overflow: hidden;
	pointer-events: none;
	transition:
		width 0.28s cubic-bezier( 0.2, 0, 0.2, 1 ),
		min-width 0.28s cubic-bezier( 0.2, 0, 0.2, 1 ),
		padding 0.28s cubic-bezier( 0.2, 0, 0.2, 1 ),
		transform 0.28s cubic-bezier( 0.2, 0, 0.2, 1 ),
		opacity 0.22s ease;
}

@media ( prefers-reduced-motion: reduce ) {
	.os-dock {
		transition-duration: 0.01ms;
	}
}

/*
 * Desktop shortcut icons & files-layer tiles —
 * hidden during overview so they don't compete with window
 * thumbnails or overlap them (especially noticeable with few
 * windows or Spatial layout). Matches the fade-out pattern
 * used by widgets and sticky notes. Scoped to DIRECT children
 * of the desktop area only: folder windows mount their own
 * files layer inside the window body, and that must stay
 * visible in its thumbnail.
 */
.os-area--overview > .os-icons,
.os-area--overview > .os-files-layer {
	opacity: 0;
	pointer-events: none;
	transition: opacity 0.22s ease;
}

/* ---------------------------------------------------------------
 * Overview thumbnail labels.
 *
 * Sit outside each window's transform (as absolute-positioned
 * siblings in the desktop area) so they stay readable at any
 * thumbnail scale — an icon-sized thumbnail still has its
 * full-size caption hovering above it.
 *
 * Layout: one line, icon + title (+ optional meta). Horizontal
 * center-of-thumbnail alignment is handled via the label's
 * own flex + width set in JS to match the scaled thumbnail.
 * --------------------------------------------------------------- */
.os-overview-label {
	position: absolute;
	height: 28px;
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 6px;
	padding: 0 10px;
	color: var( --os-ui-fg-on-accent, #fff );
	font-size: 13px;
	font-weight: 500;
	line-height: 1;
	letter-spacing: 0.01em;
	text-shadow: 0 1px 3px rgba( 0, 0, 0, 0.55 );
	white-space: nowrap;
	pointer-events: none;
	opacity: 0;
	transform: translateY( 4px );
	transition:
		opacity 0.22s ease 0.06s,
		transform 0.28s cubic-bezier( 0.2, 0, 0.2, 1 ) 0.06s;
	z-index: 2;
}

/*
 * Active labels fade/slide in once the area enters overview mode.
 * The short delay on `transition-*` lets the thumbnails start
 * moving first, so labels appear to "catch up" rather than race
 * ahead of their windows.
 */
.os-area--overview .os-overview-label {
	opacity: 1;
	transform: translateY( 0 );
}

/* On exit, flip the animation off. */
.os-overview-label--out {
	opacity: 0 !important;
	transform: translateY( -4px ) !important;
	transition-delay: 0s !important;
}

.os-overview-label__icon {
	font-size: 16px;
	width: 16px;
	height: 16px;
	line-height: 1;
	flex-shrink: 0;
	opacity: 0.9;
}

.os-overview-label__title {
	overflow: hidden;
	text-overflow: ellipsis;
}

.os-overview-label__meta {
	color: rgba( 255, 255, 255, 0.7 );
	font-weight: 400;
	flex-shrink: 0;
}

/*
 * Dim labels when another window is hovered. DOM order places
 * each label immediately after its window, so the adjacent-
 * sibling selector picks out exactly the label belonging to the
 * hovered window and keeps it bright; all other labels fall under
 * the `:has()` rule and dim.
 */
.os-area--overview:has( .os-window--overview:hover )
	.os-overview-label {
	opacity: 0.45;
	transform: translateY( 0 );
}

.os-window--overview:hover + .os-overview-label {
	opacity: 1 !important;
}

@media ( prefers-reduced-motion: reduce ) {
	.os-overview-label {
		transition-duration: 0.01ms;
		transition-delay: 0s;
	}
}

/*
 * Focused-window label overlay is not strictly needed — the title
 * bar stays visible in the scaled thumbnail. If we later want a
 * cleaner label (to combat tiny text on 8+-window grids), slot it
 * in here via a ::after pseudo-element.
 */

@media ( prefers-reduced-motion: reduce ) {
	.os-area--overview,
	.os-window--overview {
		transition-duration: 0.01ms;
	}
	.os-area--overview > .os-icons,
	.os-area--overview > .os-files-layer {
		transition-duration: 0.01ms;
	}
}

/* ---------------------------------------------------------------
 * Overview top bar — virtual desktops ("Spaces") strip.
 *
 * Lives at the top of the desktop area while overview is active,
 * stacked above the dimmed backdrop and below the window
 * thumbnails. Each tile represents one desktop; clicking switches
 * to it (and exits overview), the trailing "+" tile creates a new
 * one, and per-tile X buttons close.
 * --------------------------------------------------------------- */

.os-overview-top-bar {
	position: absolute;
	top: 16px;
	left: 50%;
	transform: translateX( -50% );
	z-index: 2;
	opacity: 0;
	pointer-events: none;
	transition:
		opacity 0.22s ease 0.06s,
		transform 0.28s cubic-bezier( 0.2, 0, 0.2, 1 ) 0.06s;
}

.os-area--overview .os-overview-top-bar {
	opacity: 1;
	pointer-events: auto;
}

.os-overview-top-bar--out {
	opacity: 0 !important;
	transform: translateX( -50% ) translateY( -6px ) !important;
	transition-delay: 0s !important;
}

.os-overview-top-bar__list {
	display: flex;
	flex-direction: row;
	align-items: stretch;
	gap: 12px;
	padding: 8px 12px;
	border-radius: 14px;
	background-color: var( --os-ui-scrim, rgba( 0, 0, 0, 0.32 ) );
	backdrop-filter: blur( 18px ) saturate( 140% );
	-webkit-backdrop-filter: blur( 18px ) saturate( 140% );
	box-shadow:
		0 8px 28px rgba( 0, 0, 0, 0.35 ),
		inset 0 0 0 1px rgba( 255, 255, 255, 0.08 );
}

.os-overview-top-bar__tile {
	position: relative;
	display: flex;
	flex-direction: column;
	align-items: stretch;
	justify-content: stretch;
	width: 140px;
	padding: 0;
	margin: 0;
	background: rgba( 255, 255, 255, 0.04 );
	border: 2px solid rgba( 255, 255, 255, 0.18 );
	border-radius: 10px;
	color: var( --os-ui-fg-on-accent, #fff );
	cursor: pointer;
	overflow: hidden;
	transition:
		border-color 0.18s ease,
		background-color 0.18s ease,
		transform 0.18s ease;
	font: inherit;
}

.os-overview-top-bar__tile:hover {
	border-color: rgba( 255, 255, 255, 0.4 );
	background: rgba( 255, 255, 255, 0.08 );
}

.os-overview-top-bar__tile:focus-visible {
	outline: 2px solid var( --wp-admin-theme-color, #2271b1 );
	outline-offset: 2px;
}

.os-overview-top-bar__tile--active {
	border-color: var( --wp-admin-theme-color, #2271b1 );
	box-shadow: 0 0 0 1px var( --wp-admin-theme-color, #2271b1 );
}

.os-overview-top-bar__tile-preview {
	display: flex;
	align-items: center;
	justify-content: center;
	height: 60px;
	background: linear-gradient(
		135deg,
		rgba( 255, 255, 255, 0.04 ),
		rgba( 255, 255, 255, 0.12 )
	);
	border-bottom: 1px solid rgba( 255, 255, 255, 0.08 );
}

.os-overview-top-bar__tile-count {
	font-size: 18px;
	font-weight: 600;
	color: rgba( 255, 255, 255, 0.7 );
	letter-spacing: 0.02em;
}

.os-overview-top-bar__tile-label {
	display: block;
	padding: 6px 10px 8px;
	text-align: center;
	font-size: 12px;
	font-weight: 500;
	color: rgba( 255, 255, 255, 0.85 );
	white-space: nowrap;
	overflow: hidden;
	text-overflow: ellipsis;
}

.os-overview-top-bar__tile-wrapper {
	position: relative;
	display: inline-block;
}

.os-overview-top-bar__tile-close {
	position: absolute;
	top: 4px;
	inset-inline-end: 4px;
	width: 18px;
	height: 18px;
	display: flex;
	align-items: center;
	justify-content: center;
	color: rgba( 255, 255, 255, 0.7 );
	background: var( --os-ui-scrim, rgba( 0, 0, 0, 0.45 ) );
	border-radius: 50%;
	cursor: pointer;
	opacity: 0;
	transition:
		opacity 0.15s ease,
		background-color 0.15s ease,
		color 0.15s ease;
	border: none;
	padding: 0;
}

.os-overview-top-bar__tile-wrapper:hover
	.os-overview-top-bar__tile-close,
.os-overview-top-bar__tile-wrapper:focus-within
	.os-overview-top-bar__tile-close,
.os-overview-top-bar__tile-close:focus-visible {
	opacity: 1;
}

.os-overview-top-bar__tile-close:hover {
	background: var( --os-ui-danger, #d63638 );
	color: var( --os-ui-fg-on-accent, #fff );
}

/*
 * Hide the close X when there's only one tile left — the tile
 * list contains both desktop wrappers AND the trailing "+".
 * So "only one desktop" means exactly one wrapper in the list.
 */
.os-overview-top-bar__list:has(
		.os-overview-top-bar__tile-wrapper:only-of-type
	)
	.os-overview-top-bar__tile-close {
	display: none;
}

.os-overview-top-bar__tile--add {
	width: 60px;
	background: transparent;
	border-style: dashed;
}

.os-overview-top-bar__tile--add:hover {
	background: rgba( 255, 255, 255, 0.08 );
}

/*
 * Keyboard cursor parked on the "+" tile. Mirrors the visual weight
 * of `--active` (solid accent border + halo) so the user sees at a
 * glance "Enter will land here". The dashed border on the add tile
 * flips to solid when the cursor lands, matching the desktop tiles'
 * solid borders.
 */
.os-overview-top-bar__tile--add.os-overview-top-bar__tile--cursor {
	border-style: solid;
	border-color: var( --wp-admin-theme-color, #2271b1 );
	box-shadow: 0 0 0 1px var( --wp-admin-theme-color, #2271b1 );
	background: rgba( 255, 255, 255, 0.08 );
}

.os-overview-top-bar__tile-plus {
	display: flex;
	align-items: center;
	justify-content: center;
	flex: 1;
	font-size: 28px;
	font-weight: 200;
	color: rgba( 255, 255, 255, 0.7 );
	line-height: 1;
}

@media ( prefers-reduced-motion: reduce ) {
	.os-overview-top-bar {
		transition-duration: 0.01ms;
	}
}