/**
 * Plan editor styling.
 *
 * MDXEditor's structural CSS is imported by the app; this retheme layer maps it
 * onto Ace's tokens so the editor reads as part of the product rather than as a
 * third-party widget.
 */

@import "./callout.css";

/* Evidence can extend beyond the clipped document column; only its panel takes hits. */
.plan-evidence-popover {
	pointer-events: none;
	position: fixed;
	inset: 0;
	z-index: 40;
}

.plan-evidence-panel {
	pointer-events: auto;
	position: fixed;
	width: min(20rem, calc(100vw - 24px));
	max-height: calc(100dvh - 24px);
	overflow-y: auto;
	border-radius: var(--radius-md);
	background: var(--color-page);
	box-shadow: var(--shadow-overlay);
	outline: var(--edge-width) solid var(--color-edge);
	outline-offset: calc(-1 * var(--edge-width));
}

.plan-content [data-research-draft-anchor] {
	margin-block-end: var(--research-draft-space, 0);
}

.plan-research-draft {
	width: min(28.125rem, var(--plan-content-width, 48rem), calc(100vw - 2rem));
	padding: 0.875rem;
	border: var(--edge-width) solid var(--color-edge);
	border-radius: var(--radius-lg);
	background: var(--color-page);
	box-shadow: var(--shadow-resting);
}

[data-research-ready] {
	box-shadow: var(--shadow-resting-strong);
	transition: box-shadow var(--duration-fast) var(--ease-out);
}

[data-research-ready]:hover,
[data-research-ready]:focus-within {
	box-shadow: var(--shadow-raised);
}

.plan-research-open {
	position: absolute;
	z-index: 1;
	inset: 0;
	cursor: pointer;
	border: 0;
	border-radius: inherit;
	background: transparent;
}

/* Research widgets never exceed 450px and shrink with their container. */
.plan-research-composer,
.plan-research-tracked {
	width: 100%;
	max-width: 28.125rem;
}

.plan-research-composer {
	display: grid;
	gap: 0.625rem;
}

.plan-research-field {
	position: relative;
}

.plan-research-field textarea {
	display: block;
	width: 100%;
	min-height: 5.5rem;
	resize: none;
	padding: 0.625rem 2.5rem 3rem 0.75rem;
	font: inherit;
	font-size: var(--text-sm);
}

.plan-research-dismiss {
	position: absolute;
	inset: 0.3125rem 0.3125rem auto auto;
}

.plan-research-send {
	position: absolute;
	inset: auto 0.625rem 0.625rem auto;
}

.plan-research-actions {
	display: flex;
	flex-wrap: wrap;
	justify-content: flex-end;
	gap: 0.5rem;
}

.plan-research-tracked {
	display: grid;
}

.plan-research-status {
	display: flex;
	align-items: center;
	gap: 0.5rem;
	min-height: 1.5rem;
	font-size: var(--text-sm);
	color: var(--color-text-tertiary);
}

/* Stages that lead with a badge give their header more room. */
.plan-research-status[data-lead] {
	margin-block-end: 0.25rem;
}

.plan-research-remove {
	display: flex;
	align-items: center;
	margin-inline-start: auto;
}

.plan-research-meta {
	color: var(--color-text-quaternary);
}

.plan-research-title {
	font-size: var(--text-sm);
	font-weight: 600;
	line-height: var(--text-sm--line-height);
	color: var(--color-text-primary);
}

.plan-research-card[data-stage="cancelled"] .plan-research-title {
	color: var(--color-text-tertiary);
}

.plan-research-summary {
	margin: 0;
	font-size: var(--text-sm);
	color: var(--color-text-secondary);
}

.plan-research-footer {
	display: flex;
	justify-content: flex-end;
}

.plan-research-dot {
	width: 0.5rem;
	height: 0.5rem;
	margin-inline: 0.1875rem;
	border-radius: 50%;
	background: var(--color-brand);
	animation: plan-research-pulse 1.4s var(--ease-out) infinite;
}

.plan-research-dot[data-idle] {
	background: var(--color-text-quaternary);
	animation: none;
}

@keyframes plan-research-pulse {
	0% {
		box-shadow: 0 0 0 0 color-mix(in oklch, var(--color-brand) 45%, transparent);
	}
	100% {
		box-shadow: 0 0 0 0.375rem transparent;
	}
}

.plan-research-badge {
	display: grid;
	flex-shrink: 0;
	place-items: center;
	width: 1.5rem;
	height: 1.5rem;
	border-radius: 50%;
	background: var(--color-danger-surface);
	color: var(--color-destructive);
}

.plan-research-badge[data-tone="brand"] {
	background: var(--color-brand-wash);
	color: var(--color-brand);
}

.plan-research-badge [data-nucleo-icon] {
	color: inherit;
}

.plan-research-callout {
	padding: 0.375rem 0.75rem;
	border-radius: var(--radius-md);
	background: var(--color-ruby-2);
}

.plan-research-callout p {
	margin: 0;
	padding-block: 0.125rem;
	font-size: var(--text-sm);
	line-height: var(--text-sm--line-height);
	color: var(--color-destructive-ink);
}

.plan-research-track {
	display: grid;
	grid-template-columns: repeat(5, 1fr);
	gap: 0.25rem;
	padding-inline: 0.25rem;
}

.plan-research-track span {
	position: relative;
	overflow: hidden;
	height: 0.3125rem;
	border-radius: var(--radius-full);
	background: var(--color-selected);
	transition: background-color 500ms var(--ease-out);
}

.plan-research-track span[data-state="now"],
.plan-research-track span[data-state="done"] {
	background: var(--color-brand);
}

/* The sheen rides its own layer so it can fade without touching the fill. */
.plan-research-track span::after {
	content: "";
	position: absolute;
	inset: 0;
	background: linear-gradient(
		90deg,
		transparent 0%,
		color-mix(in oklch, white 70%, transparent) 50%,
		transparent 100%
	);
	background-size: 50% 100%;
	background-repeat: no-repeat;
	opacity: 0;
	animation: plan-research-sheen 1.6s linear infinite;
	transition: opacity 400ms var(--ease-out);
}

.plan-research-track span[data-state="now"]::after {
	opacity: 1;
	transition-delay: var(--duration-base);
}

@keyframes plan-research-sheen {
	from {
		background-position: -100% 0;
	}
	to {
		background-position: 200% 0;
	}
}

.plan-research-found {
	padding-inline: 0.25rem;
	font-size: var(--text-xs);
	color: var(--color-text-tertiary);
}

/* Swap: layers share one grid cell and crossfade by opacity alone. */
.plan-research-swap {
	display: inline-grid;
}

.plan-research-swap > span {
	grid-area: 1 / 1;
	animation: plan-research-swap-in 360ms var(--ease-out) var(--duration-fast) both;
}

.plan-research-swap > span[data-initial] {
	animation: none;
}

.plan-research-swap > span[data-leaving] {
	animation: plan-research-swap-out 240ms var(--ease-out) both;
}

@keyframes plan-research-swap-in {
	from {
		opacity: 0;
	}
}

@keyframes plan-research-swap-out {
	to {
		opacity: 0;
	}
}

.plan-research-indicator {
	place-items: center;
}

.plan-research-indicator > span {
	display: grid;
	place-items: center;
	min-width: 0.875rem;
	min-height: 0.875rem;
}

.plan-research-indicator .plan-research-dot {
	margin: 0;
}

/* Fold: animates grid rows so height changes are never a jump. */
.plan-research-fold {
	display: grid;
	grid-template-rows: 0fr;
	opacity: 0;
	transition: grid-template-rows 420ms var(--ease-out), opacity 300ms var(--ease-out);
}

.plan-research-fold[data-open] {
	grid-template-rows: 1fr;
	opacity: 1;
	transition-delay: var(--duration-fast);
}

.plan-research-fold > div {
	min-height: 0;
	overflow: hidden;
}

.plan-research-tracked > .plan-research-fold > div {
	display: grid;
	gap: 0.5rem;
	padding-block-start: 0.625rem;
}

/* Inside the card a fold owns its gap, so a closed one takes no space. */
.plan-research-card .plan-research-fold {
	margin-block-start: -0.5rem;
}

.plan-research-card .plan-research-fold > div > * {
	margin-block-start: 0.5rem;
}

@media (prefers-reduced-motion: reduce) {
	.plan-research-dot,
	.plan-research-swap > span,
	.plan-research-track span::after {
		animation: none;
	}
	.plan-research-fold,
	.plan-research-track span,
	.plan-research-track span::after {
		transition: none;
	}
}

.plan,
.plan-decisions {
	--plan-gutter: 4rem;
	/*
	 * A comfortable measure. The panel is resizable and a plan is read far more
	 * often than it is written, so the text stops widening well before the pane
	 * does. At the body size below this is roughly 85 characters a line, near
	 * the top of the range a reader can track back from without losing the row.
	 */
	--plan-measure: 43.75rem;
	/*
	 * Document body text, one step down from the old 17px so prose sits
	 * closer to chrome and chat sizes. Resolved out here because MDXEditor
	 * declares `--text-base`, `--text-sm`
	 * and `--text-xs` on its own root, which sits between `:root` and the
	 * document — so reading the theme token inside the editor gets its 1rem
	 * rather than ours. `.plan` is outside that root, so this catches the
	 * theme's value on the way past.
	 */
	--plan-text-xs: var(--text-xs);
	--plan-text-sm: var(--text-sm);
	--plan-body: var(--text-base);
}

/* Document views -------------------------------------------------------- */

.plan-workspace {
	position: relative;
	display: flex;
	flex: 1;
	min-height: 0;
	overflow: hidden;
}

.plan-document {
	position: relative;
	container-type: inline-size;
	flex: 1;
	min-width: 0;
	min-height: 0;
	background: var(--color-page);
	box-shadow: var(--shadow-raised);
}

/* A narrow document needs breathing room, but never a 32px tax on each side. */
@container (max-width: 40rem) {
	.plan-content,
	.plan-decisions-content {
		--plan-gutter: 1rem;
	}

	/* Anchor state keeps this lane stable when its marker leaves the viewport. */
	.plan-document[data-plan-decision-lane] .plan-content {
		--plan-leading-gutter: 2rem;
	}

	/* Wide authored surfaces keep their own visible, keyboard-operable lane. */
	.plan-content :is(pre, table, .plan-code-view, [role="tablist"]) {
		overscroll-behavior-inline: contain;
	}

	.plan-content :is(pre, table, .plan-code-view, [role="tablist"])::-webkit-scrollbar {
		block-size: 8px;
	}

	.plan-content :is(pre, table, .plan-code-view, [role="tablist"])::-webkit-scrollbar-track {
		background: var(--color-inset);
	}

	.plan-content :is(pre, table, .plan-code-view, [role="tablist"])::-webkit-scrollbar-thumb {
		border: 2px solid var(--color-inset);
		border-radius: var(--radius-lg);
		background: var(--color-text-quaternary);
	}
}

/* Reader-local comment chrome must not move collaborative line boxes. */
.plan-comment-layer {
	pointer-events: none;
	position: absolute;
	inset: 0;
	z-index: 2;
}

.plan-comment-chip,
.plan-comment-orphan-button {
	z-index: 1;
	pointer-events: auto;
	border: var(--edge-width) solid var(--color-control-edge);
	background: var(--color-page);
	color: var(--color-text-secondary);
	box-shadow: var(--shadow-resting);
}

/* The button is the hit area: on a coarse pointer 44px wide and as tall as the first line, inside the document. */
.plan-comment-button {
	pointer-events: auto;
	position: absolute;
	border-radius: var(--radius-md);
	transition: opacity var(--duration-fast) var(--ease-out);
}

.plan-comment-chip {
	position: absolute;
	display: inline-flex;
	height: 24px;
	align-items: center;
	justify-content: center;
	gap: 0.125rem;
	border-radius: var(--radius-md);
	font-size: var(--text-xs);
	font-variant-numeric: tabular-nums;
	line-height: 1;
}

.plan-comment-button[data-slim] .plan-comment-chip {
	border-radius: var(--radius-sm);
}

.plan-comment-button[data-replies] .plan-comment-chip {
	background: var(--color-brand-wash);
	color: var(--color-brand-ink);
}

/* Another thread's card is open: this marker steps back and cannot be pressed. */
.plan-comment-button[data-dimmed] {
	opacity: 0.4;
}

/* The host receives hits so prose keeps native selection. */
.plan-comment-hit {
	pointer-events: none;
	position: absolute;
}

.plan-comment-button:hover .plan-comment-chip,
.plan-comment-button:focus-visible .plan-comment-chip,
.plan-comment-button[aria-expanded="true"] .plan-comment-chip,
.plan-comment-orphan-button:hover,
.plan-comment-orphan-button:focus-visible {
	background: var(--color-brand-wash);
	color: var(--color-brand-ink);
}

.plan-comment-preview,
.plan-comment-card {
	pointer-events: auto;
	position: absolute;
	width: min(20rem, calc(100% - 1.5rem));
}

.plan-comment-preview {
	/* A narrow preview can overlap prose, but never intercept it. */
	pointer-events: none;
	max-width: 18rem;
	padding: 0.625rem;
	border-radius: var(--radius-md);
	background: var(--color-page);
	box-shadow: var(--shadow-overlay);
	outline: var(--edge-width) solid var(--color-edge);
	outline-offset: calc(-1 * var(--edge-width));
	font-size: var(--text-sm);
	color: var(--color-text-primary);
}

.plan-comment-preview p {
	margin: 0;
}

.plan-comment-preview .plan-comment-preview-author {
	display: flex;
}

.plan-comment-preview .plan-comment-preview-note {
	margin-top: 0.125rem;
}

.plan-comment-preview .plan-comment-preview-replies {
	display: block;
	margin-top: 0.25rem;
	color: var(--color-text-tertiary);
}

.plan-comment-card {
	max-height: calc(100% - 1rem);
	overflow: auto;
	border-radius: var(--radius-lg);
	box-shadow: var(--shadow-overlay);
	--enter-x: 0;
	--enter-y: 0;
	animation: plan-comment-enter var(--duration-fast) var(--ease-out);
}

/* The card enters from its passage: across from the gutter, down from below, up from above. */
.plan-comment-card[data-side="right"] {
	--enter-x: 0.25rem;
	transform-origin: top left;
}

.plan-comment-card[data-side="below"] {
	--enter-y: -0.25rem;
	transform-origin: top left;
}

.plan-comment-card[data-side="above"] {
	--enter-y: 0.25rem;
	transform-origin: bottom left;
}

[data-plan-comment-card] {
	background: var(--color-page);
	box-shadow: none;
}

.plan-comment-close {
	margin: -0.25rem -0.25rem -0.25rem 0;
	color: var(--color-text-tertiary);
}

.plan-comment-back {
	margin-left: -0.5rem;
	color: var(--color-text-tertiary);
}

.plan-comment-group-item {
	display: flex;
	width: 100%;
	flex-direction: column;
	gap: 0.125rem;
	padding: 0.375rem 0.5rem;
	border-radius: var(--radius-md);
	text-align: left;
}

.plan-comment-group-item:hover {
	background: var(--color-hover);
}

.plan-comment-group-note {
	display: -webkit-box;
	overflow: hidden;
	-webkit-box-orient: vertical;
	-webkit-line-clamp: 1;
}

.plan-comment-context {
	padding: 0.5rem 0.625rem;
	border-radius: var(--radius-md);
	background: var(--color-inset);
}

.plan-comment-context-copy {
	display: -webkit-box;
	overflow: hidden;
	-webkit-box-orient: vertical;
	-webkit-line-clamp: 3;
	line-height: var(--text-sm--line-height);
}

.plan-comment-composer[data-inset-send] {
	border-radius: var(--radius-md);
	background: var(--color-page);
}

.plan-comment-composer[data-inset-send] .plan-comment-composer-field {
	padding-right: 3rem;
	padding-bottom: 2.75rem;
}

.plan-comment-confirm {
	padding: 0.625rem;
	border-radius: var(--radius-md);
	background: var(--color-inset);
}

@keyframes plan-comment-enter {
	from {
		opacity: 0;
		transform: translate(var(--enter-x), var(--enter-y));
	}

	to {
		opacity: 1;
		transform: none;
	}
}

.motion-comment-preview {
	opacity: 0;
	transform: scale(var(--dropdown-pre-scale));
	transition:
		opacity var(--dropdown-open-dur) var(--dropdown-ease),
		transform var(--dropdown-open-dur) var(--dropdown-ease);
	will-change: opacity, transform;
}

.motion-comment-preview.is-open {
	opacity: 1;
	transform: none;
}

@starting-style {
	.motion-comment-preview.is-open {
		opacity: 0;
		transform: scale(var(--dropdown-pre-scale));
	}
}

.motion-comment-preview.is-closing {
	opacity: 0;
	transform: scale(var(--dropdown-closing-scale));
	transition-duration: var(--dropdown-close-dur);
}

.motion-comment-preview[data-motion-immediate] {
	transition: none;
}

.motion-comment-surface {
	opacity: 0;
	transform: scale(var(--dropdown-pre-scale));
	transform-origin: top right;
	transition:
		opacity var(--dropdown-open-dur) var(--dropdown-ease),
		transform var(--dropdown-open-dur) var(--dropdown-ease);
	will-change: opacity, transform;
}

.motion-comment-surface[data-motion-presentation="sheet"] {
	transform: translateY(var(--drawer-distance));
	transform-origin: bottom center;
	transition-duration: var(--drawer-open-dur);
}

.motion-comment-surface.is-open {
	opacity: 1;
	transform: none;
}

.motion-comment-surface.is-closing {
	pointer-events: none;
	opacity: 0;
	transform: scale(var(--dropdown-closing-scale));
	transition-duration: var(--dropdown-close-dur);
}

.motion-comment-surface[data-motion-presentation="sheet"].is-closing {
	transform: translateY(var(--drawer-distance));
	transition-duration: var(--drawer-close-dur);
}

.plan-comment-orphans {
	pointer-events: auto;
	position: absolute;
	top: 0.5rem;
	right: 0.5rem;
}

.plan-comment-orphan-button {
	border-radius: var(--radius-md);
	padding: 0.375rem 0.5rem;
	font-size: var(--text-sm);
}

.plan-comment-orphan-card {
	top: 2.5rem;
	right: 0;
}

.plan-comment-sheet-backdrop {
	--backdrop-opacity: 0.24;
	position: fixed;
	inset: 0;
	z-index: 70;
	background: rgb(var(--shadow-color));
	opacity: calc(var(--backdrop-opacity) * (1 - var(--drawer-swipe-progress, 0)));
	transition: opacity var(--duration-base) var(--ease-out);
}

.plan-comment-sheet-viewport {
	pointer-events: none;
	position: fixed;
	inset: 0;
	z-index: 71;
	display: flex;
	align-items: flex-end;
}

.plan-comment-sheet-popup {
	pointer-events: auto;
	display: flex;
	width: 100%;
	flex-direction: column;
	height: calc(100dvh - 0.5rem);
	overflow: hidden;
	border-radius: var(--radius-xl) var(--radius-xl) 0 0;
	background: var(--color-page);
	box-shadow: 0 -1rem 3rem rgb(var(--shadow-color) / 22%);
	transform: translateY(
		calc(var(--drawer-snap-point-offset, 100%) + var(--drawer-swipe-movement-y, 0px))
	);
	transition: transform calc(var(--drawer-swipe-strength, 1) * var(--duration-base))
		var(--ease-out);
}

.plan-comment-sheet-grabber {
	display: grid;
	width: 100%;
	height: 2rem;
	flex: none;
	place-items: center;
	border: 0;
	background: transparent;
	color: var(--color-text-tertiary);
	touch-action: none;
}

.plan-comment-sheet-grabber span {
	width: 2.25rem;
	height: 0.3rem;
	border-radius: var(--radius-full);
	background: var(--color-text-tertiary);
}

/* Sits in the grabber row, so a draft needs no header row; the sheet is touch-only, so 44px. */
.plan-comment-sheet-close {
	position: absolute;
	top: 0;
	right: 0.25rem;
	width: 2.75rem;
	height: 2.75rem;
	margin: 0;
}

.plan-comment-sheet-title {
	margin: 0;
	padding: 0 1rem 0.5rem;
	color: var(--color-text-primary);
	font-size: var(--text-sm);
	font-weight: 600;
}

.plan-comment-sheet-content {
	min-height: 0;
	flex: 1;
	overflow: auto;
	padding-right: env(safe-area-inset-right, 0px);
	padding-bottom: calc(env(safe-area-inset-bottom, 0px) + var(--drawer-keyboard-inset, 0px));
	padding-left: env(safe-area-inset-left, 0px);
	overscroll-behavior: contain;
}

.plan-comment-sheet-content > [data-plan-comment-card] {
	border-radius: 0;
	box-shadow: none;
}

.plan-comment-sheet-popup[data-starting-style],
.plan-comment-sheet-popup[data-ending-style] {
	transform: translateY(100%);
}

.plan-comment-sheet-backdrop[data-starting-style],
.plan-comment-sheet-backdrop[data-ending-style] {
	opacity: 0;
}

@media (prefers-reduced-motion: reduce) {
	.plan-comment-card {
		animation: none;
	}

	.plan-comment-sheet-backdrop,
	.plan-comment-sheet-popup {
		transition-duration: 0ms;
	}
}

@media (prefers-reduced-motion: reduce) {
	.motion-comment-preview,
	.motion-comment-surface {
		transition: none;
	}
}

.plan-decisions {
	display: flex;
	height: 100%;
	min-width: 0;
	min-height: 0;
	flex-direction: column;
	overflow: hidden;
	container-type: inline-size;
	/* The workspace ground shows through the rail. */
	background: transparent;
}

.plan-decisions-content {
	padding: 1.5rem var(--plan-gutter) 60vh;
	margin-inline: auto;
	max-width: calc(var(--plan-measure) + var(--plan-gutter) * 2);
}

.plan-decisions-content--empty {
	display: flex;
	width: 100%;
	max-width: none;
	align-items: safe center;
	justify-content: center;
	padding: 3rem var(--plan-gutter);
}

.plan-decisions-empty {
	display: flex;
	width: min(100%, 42rem);
	min-height: 19rem;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	padding: 2.5rem 1.5rem;
	border: var(--edge-width) dashed var(--color-control-edge);
	border-radius: var(--radius-lg);
	text-align: center;
}

.plan-decisions-empty-icon {
	display: grid;
	width: 3.5rem;
	height: 3.5rem;
	place-items: center;
	margin-block-end: 1.5rem;
	border-radius: var(--radius-lg);
	background: var(--color-inset);
	color: var(--color-text-primary);
}

.plan-decisions-empty h3 {
	margin: 0;
	font-size: var(--text-xl);
	font-weight: 600;
	line-height: 1.25;
	color: var(--color-text-primary);
}

.plan-decisions-empty p {
	max-width: 27rem;
	margin: 0.5rem 0 0;
	font-size: var(--text-base);
	line-height: 1.5;
	color: var(--color-text-tertiary);
}

/* Decorator hosts are block-level plan content, not zero-size anchors. */
.plan .plan-content [data-plan-questionnaire],
.plan .plan-content [data-plan-decision] {
	margin-block: 1rem;
}

/* Keep the one editable caret paragraph between consecutive cards compact. */
.plan
	.plan-content
	> :is([data-plan-questionnaire], [data-plan-decision]):has(+ p > br:only-child):has(+ p + :is([data-plan-questionnaire], [data-plan-decision])) {
	margin-block-end: 0;
}

.plan
	.plan-content
	> :is([data-plan-questionnaire], [data-plan-decision])
	+ p:has(> br:only-child):has(+ :is([data-plan-questionnaire], [data-plan-decision])) {
	margin-block: 0;
}

.plan
	.plan-content
	> :is([data-plan-questionnaire], [data-plan-decision])
	+ p:has(> br:only-child)
	+ :is([data-plan-questionnaire], [data-plan-decision]) {
	margin-block-start: 0;
}

/* The inner card is hidden after resolution, but its Lexical decorator host
   also has document spacing. Remove that host from layout as well. */
.plan .plan-content [data-plan-questionnaire]:has([data-card-hidden]) {
	display: none;
	margin-block: 0;
}

.plan .plan-content :is([data-plan-questionnaire], [data-plan-decision]) article {
	width: 100%;
}

.decision-collapse {
	display: grid;
	grid-template-rows: 1fr;
	transition:
		grid-template-rows var(--duration-base) var(--ease-out),
		opacity var(--duration-base) var(--ease-out);
}

.decision-collapse.is-closing {
	grid-template-rows: 0fr;
	opacity: 0;
}

@media (prefers-reduced-motion: reduce) {
	.decision-collapse {
		transition: none;
	}
}

/*
 * The prose a sidecar card refers to, while somebody is pointing at that card.
 *
 * Registered in `CSS.highlights`, so it paints over the text without putting
 * anything in the document. One mark for both halves of the sidecar: questions
 * used to outline a block while comments washed a range, so the same fact —
 * this is the prose that card refers to — read as two different things
 * depending on which card it came from. `::highlight()` cannot draw an outline,
 * so the wash is what they can both be.
 *
 * Nothing is painted at rest. Standing marks for live comments and for decided
 * prose were tried and taken out: a plan accumulates decisions, so anything
 * permanent ends up covering most of the document, and a page that is mostly
 * highlighted has told you nothing.
 *
 * `background-color`, not `background`: only a handful of longhands are
 * permitted here, and the shorthand works today solely because browsers expand
 * it before filtering. Not worth depending on.
 *
 * The colour is recorded beside the declaration because it is calibrated as
 * a rendered wash, not as an abstract percentage of a darker accent.
 */
::highlight(plan-related) {
	/* #d8eaee */
	background-color: var(--color-brand-wash);
}

/* The passage a link is being added to, while its field holds the selection. */
::highlight(plan-link-target) {
	background-color: var(--color-brand-wash);
}

/*
 * The same pointer, for a browser with no Highlight API.
 *
 * A block outline rather than a wash, because without the API there is no way
 * to mark part of one — less precise, and honest about it. Standing marks are
 * dropped entirely on this path: outlining every decided passage would box up
 * half the plan.
 */
.plan .plan-content [data-plan-related] {
	border-radius: var(--radius-sm);
	outline: 1px solid color-mix(in oklch, var(--color-brand) 60%, transparent);
	outline-offset: 3px;
	background: var(--color-brand-wash);
}

/*
 * Retheme MDXEditor onto Ace's tokens.
 *
 * MDXEditor ships a light Radix palette on its own root and only switches off
 * it for a `.dark-theme` class it expects the host to add. Ace has its own
 * theme, so rather than opt into a second one we point its variables at ours —
 * the editor then follows Ace into light or dark with nothing to keep in sync.
 *
 * These have to land on the same element MDXEditor sets them on; an ancestor
 * would lose to its own declaration.
 */
.plan .mdxeditor {
	background: transparent;
	font-family: var(--font-sans);
	--text-xs: var(--plan-text-xs);
	--text-sm: var(--plan-text-sm);
	--text-base: var(--plan-body);

	--basePageBg: transparent;
	--baseBase: var(--color-page);
	--baseBgSubtle: var(--color-inset);
	--baseBg: var(--color-hover);
	--baseBgHover: var(--color-hover);
	--baseBgActive: var(--color-selected);
	--baseLine: var(--color-edge);
	--baseBorder: var(--color-edge);
	--baseBorderHover: var(--color-brand);
	--baseSolid: var(--color-text-tertiary);
	--baseSolidHover: var(--color-text-primary);
	--baseText: var(--color-text-primary);
	--baseTextContrast: var(--color-text-primary);

	--accentBase: var(--color-page);
	--accentBgSubtle: var(--color-brand-wash);
	--accentBg: var(--color-brand-wash);
	--accentBgHover: var(--color-brand-wash);
	--accentBgActive: var(--color-brand-wash);
	--accentLine: var(--color-edge);
	--accentBorder: var(--color-edge);
	--accentBorderHover: var(--color-brand);
	--accentSolid: var(--color-brand);
	--accentSolidHover: var(--color-brand-hover);
	--accentText: var(--color-brand);
	--accentTextContrast: var(--color-text-primary);

	--admonitionTipBg: var(--color-success-wash);
	--admonitionTipBorder: var(--color-success);
	--admonitionInfoBg: var(--color-brand-wash);
	--admonitionInfoBorder: var(--color-brand);
	--admonitionCautionBg: var(--color-warning-wash);
	--admonitionCautionBorder: var(--color-warning);
	--admonitionDangerBg: var(--color-destructive-wash);
	--admonitionDangerBorder: var(--color-destructive);
	--admonitionNoteBg: var(--color-hover);
	--admonitionNoteBorder: var(--color-edge);

	--error-color: var(--color-destructive);
	--font-body: var(--font-sans);
	--font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/*
 * Scoped to `.plan` on purpose. MDXEditor sets padding and colour directly
 * on its own content class, which is exactly as specific as ours, so a bare
 * `.plan-content` wins only by landing later in the bundle. That is a
 * property of how the CSS happens to be chunked, not of anything we control.
 */
.plan .plan-content {
	--plan-leading-gutter: var(--plan-gutter);
	--plan-wide-inline-size: calc(100cqi - var(--plan-leading-gutter) - var(--plan-gutter));
	--plan-wide-inline-offset: calc((100% - var(--plan-wide-inline-size)) / 2);
	/*
	 * The trailing space is deliberate and large: the caret should never sit
	 * against the bottom of the pane, and a plan is usually appended to.
	 */
	padding: 3rem var(--plan-gutter) 60vh;
	padding-inline-start: var(--plan-leading-gutter);
	margin-inline: auto;
	max-width: calc(var(--plan-measure) + var(--plan-gutter) * 2);
	font-size: var(--plan-body);
	/* Prose wants looser leading than the UI rhythm the token pairs with. */
	line-height: 1.6;
	color: var(--color-text-primary);
}

/*
 * MDXEditor gives its placeholder the content class too. Pin its absolute box
 * across the wrapper so auto margins center it like the editable document;
 * without both insets it shrink-wraps left of the caret on a wide canvas.
 */
.plan .mdxeditor-root-contenteditable > .plan-content {
	inset-inline: 0;
	color: var(--color-text-quaternary);
}

:root[data-plan-coarse-pointer] .plan-menu-row {
	height: 44px;
	min-height: 44px;
}

:root[data-plan-coarse-pointer] .plan-menu-cell {
	width: 44px;
	height: 44px;
	min-width: 44px;
}

/*
 * Document typography.
 *
 * Tailwind's preflight resets headings to inherit their size and weight and
 * strips list markers, which is right for an app chrome and wrong for prose.
 * A plan is prose, so the document elements are given their meaning back here.
 */
.plan-content :is(h1, h2, h3, h4, h5, h6) {
	font-weight: 600;
	line-height: 1.3;
	margin-block: 1.5em 0.5em;
	color: var(--color-text-primary);
	/* Short enough to weigh every break at once, and an 8/1 split reads as a mistake. */
	text-wrap: balance;
}

.plan-content :is(h1, h2, h3, h4, h5, h6):first-child {
	margin-block-start: 0;
}

.plan-content h1 {
	font-size: var(--text-2xl);
	line-height: var(--text-2xl--line-height);
}
.plan-content h2 {
	font-size: var(--text-xl);
	line-height: var(--text-xl--line-height);
}
.plan-content h3 {
	font-size: var(--text-lg);
	line-height: var(--text-lg--line-height);
}
.plan-content :is(h4, h5, h6) {
	font-size: var(--plan-body);
}

/* iOS Safari zooms the page when it focuses editable text under 16px. */
@media (pointer: coarse) {
	.plan .plan-content,
	.plan-content :is(h4, h5, h6) {
		font-size: max(1rem, var(--plan-body));
	}
}

.plan-content p {
	margin-block: 0.75em;
}

.plan-content :is(ul, ol) {
	margin-block: 0.75em;
	padding-inline-start: 1.5em;
}

.plan-content ul {
	list-style: disc;
}
.plan-content ol {
	list-style: decimal;
}

.plan-content li {
	margin-block: 0.25em;
}

/* Nested lists sit tighter than the block they interrupt. */
.plan-content li > :is(ul, ol) {
	margin-block: 0.25em;
}

.plan-content blockquote {
	margin-block: 1em;
	padding-inline-start: 1em;
	border-inline-start: 3px solid var(--color-edge);
	color: var(--color-text-secondary);
}

.plan-content a {
	color: var(--color-brand);
	text-decoration: underline;
	text-underline-offset: 2px;
	overflow-wrap: anywhere;
}

/* Prose has no scrollbar of its own, so an authored token must be allowed to wrap. */
.plan-content :is(p, li, blockquote, h1, h2, h3, h4, h5, h6) {
	overflow-wrap: anywhere;
}

.plan-content hr {
	margin-block: 1.5em;
	border: 0;
	border-block-start: var(--edge-width) solid var(--color-edge);
}

.plan-content :is(strong, b) {
	font-weight: 600;
	color: var(--color-text-primary);
}

/* Structural components ------------------------------------------------- */

.plan-content pre {
	background: var(--color-inset);
	border-radius: var(--radius-md);
	padding: 0.75rem 1rem;
	overflow-x: auto;
	font-family: ui-monospace, SFMono-Regular, monospace;
	font-size: var(--text-sm);
}

/* Inline code follows its parent heading or prose; block code has its own role. */
.plan-content :not(pre) > code {
	background: var(--color-inset);
	color: var(--color-text-primary);
	border-radius: var(--radius-sm);
	padding: 0.125em 0.3em;
	font-family: ui-monospace, SFMono-Regular, monospace;
	font-size: inherit;
}

/*
 * Tables scroll independently so a wide one never widens the document.
 *
 * `display: block` turns the table itself into the scrollport. Its inline size
 * is the readable width, while the cells' minimum widths preserve usable
 * columns and create overflow inside that scrollport when necessary.
 */
.plan-content table {
	display: block;
	inline-size: 100%;
	max-inline-size: 100%;
	overflow-x: auto;
	border-collapse: collapse;
	margin-block: 1em;
}

.plan-content th,
.plan-content td {
	border: var(--edge-width) solid var(--color-edge);
	padding: 0.375rem 0.625rem;
	text-align: start;
	/* Without this a cell collapses onto its neighbour when a column is
	   narrow, and two values read as one word. */
	vertical-align: top;
	min-inline-size: 7rem;
	/* A table is deliberately allowed to scroll as a whole; breaking each
	   unbroken identifier into syllables makes its columns unreadable. */
	word-break: normal;
	overflow-wrap: normal;
}

.plan-content th {
	font-weight: 600;
	background: var(--color-hover);
	color: var(--color-text-primary);
}

/* A cell's paragraph is the cell; it should not add document spacing. */
.plan-content :is(th, td) > p {
	margin-block: 0;
	word-break: normal;
	overflow-wrap: normal;
}

/* Images and rendered diagrams are readings of the document, never its width. */
.plan-content :is(img, svg) {
	max-inline-size: 100%;
	block-size: auto;
}

/* Visual top-level blocks can use the document beyond the prose measure. */
.plan-content
	> :is(p:has(> [data-plan-src]:first-child
		+ br[data-lexical-managed-linebreak]:last-child), [data-plan-language="mermaid"]) {
	inline-size: var(--plan-wide-inline-size);
	max-inline-size: var(--plan-wide-inline-size);
	margin-inline: var(--plan-wide-inline-offset);
}

/*
 * A compact table shrink-wraps around its columns from the prose's start edge,
 * like every other block; a wide one scrolls inside the prose measure. The row
 * and column rails are fixed overlays and sit in the gutter outside it.
 */
.plan-content > table {
	inline-size: max-content;
	max-inline-size: 100%;
}

/* The paragraph owns the wide row; the image keeps its intrinsic size inside it. */
.plan-content
	> p:has(> [data-plan-src]:first-child + br[data-lexical-managed-linebreak]:last-child) {
	display: grid;
	place-items: center;
}

/*
 * An image that could not load. In a sentence it is a chip like inline code,
 * so the sentence still reads; alone in its paragraph it is a quiet frame at
 * the prose width rather than the wide row a loaded image would use.
 */
.plan-content .plan-image-missing {
	display: inline-flex;
	align-items: center;
	gap: 0.3em;
	max-inline-size: 100%;
	vertical-align: bottom;
	padding: 0.125em 0.3em;
	border-radius: var(--radius-sm);
	background: var(--color-inset);
	color: var(--color-text-secondary);
}

.plan-content .plan-image-missing-label {
	overflow: hidden;
	min-inline-size: 0;
	text-overflow: ellipsis;
	white-space: nowrap;
}

.plan-content
	p:has(> [data-plan-src]:first-child
		+ br[data-lexical-managed-linebreak]:last-child):has(.plan-image-missing) {
	display: block;
	/* Block layout honours `justify-items` too, which would still centre the frame. */
	place-items: normal;
	inline-size: auto;
	max-inline-size: 100%;
	margin-inline: 0;
}

.plan-content
	p:has(> [data-plan-src]:first-child + br[data-lexical-managed-linebreak]:last-child)
	> [data-plan-src]:has(> .plan-image-missing) {
	display: block;
}

/* The managed break after a block frame would add an empty line beneath it. */
.plan-content
	p:has(> [data-plan-src]:first-child > .plan-image-missing)
	> br[data-lexical-managed-linebreak]:last-child {
	display: none;
}

.plan-content
	p:has(> [data-plan-src]:first-child + br[data-lexical-managed-linebreak]:last-child)
	.plan-image-missing {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	gap: calc(var(--spacing) * 2);
	block-size: calc(var(--spacing) * 24);
	padding-inline: calc(var(--spacing) * 4);
	border: var(--edge-width) solid var(--color-edge);
	border-radius: var(--radius-md);
	color: var(--color-text-tertiary);
	font-size: var(--plan-text-xs);
}

.plan-content
	p:has(> [data-plan-src]:first-child + br[data-lexical-managed-linebreak]:last-child)
	.plan-image-missing-label {
	max-inline-size: 100%;
}

.plan-content :is([data-plan-type], [data-plan-panels], .planMath) {
	min-inline-size: 0;
	max-inline-size: 100%;
}

.plan-content .planMath [data-plan-preview] {
	max-inline-size: 100%;
	overflow-x: auto;
}

/*
 * A selected range of cells.
 *
 * `@lexical/table` marks one by adding the class the theme names under
 * `tableCellSelected` and does nothing else at all — no inline style, no
 * fallback. MDXEditor's theme names no table class of any kind, so before
 * `plan-editor.tsx` added these the selection was live and completely
 * invisible: dragging across cells appeared to do nothing while a
 * `TableSelection` was very much in effect, and the next keystroke replaced
 * everything it covered.
 */
.plan .plan-content .plan-cell-selected {
	background: var(--color-selected);
}

/* Set on the table while a cell range is being dragged out, so the browser's
   own text selection does not paint underneath ours. */
.plan .plan-content .plan-table-selecting,
.plan .plan-content .disable-selection {
	user-select: none;
}

/* Table rails ------------------------------------------------------------ */

/*
 * The grips a table is reshaped from.
 *
 * Positioned by script from measured cell rectangles, because a `<table>`
 * cannot contain a `<div>` and there is nowhere inside the node to put them.
 * So: `position: fixed`, and no Tailwind translate utility anywhere near them
 * — v4 emits the `translate` property, which composes with a transform rather
 * than replacing it.
 */
/*
 * The rail takes pointer events across the whole of itself, holes included.
 *
 * It is tempting to pass the gaps through so the prose behind stays clickable,
 * and that is what this did first. But `pointerleave` fires the instant the
 * pointer crosses anything untargetable, so every hole was somewhere the rails
 * blinked out from under a hand on its way across them. A rail exists only
 * while its table is being pointed at, and it is 28 pixels of a 32-pixel
 * gutter; the prose it covers for that moment is not worth the flicker.
 */
.plan-rail {
	position: fixed;
	z-index: 40;
	overflow: hidden;
}

.plan-rail > * {
	position: absolute;
	padding: 0;
	border: 0;
	background: transparent;
}

.plan-grip {
	border-radius: var(--radius-sm);
	background: var(--color-selected);
	transition: background-color var(--duration-fast) var(--ease-out);
}

.plan-grip:hover,
.plan-grip:focus-visible {
	background: color-mix(in oklch, var(--color-brand) 45%, transparent);
}

[data-plan-rail="column"] .plan-grip {
	cursor: grab;
}

[data-plan-rail="row"] .plan-grip {
	cursor: grab;
}

.plan-grip.is-held {
	cursor: grabbing;
	background: var(--color-brand);
}

/* The header row's bar. Drawn so the rail has no gap where the row plainly is,
   but not a control: the header cannot move and cannot be removed. */
.plan-grip.is-fixed {
	background: color-mix(in oklch, var(--color-edge) 60%, transparent);
	cursor: default;
}

/*
 * Remove and insert, in the lane beyond the grips.
 *
 * Nothing here overlaps a grip, so a drag can begin anywhere along one. Hiding
 * is `opacity` rather than `display`, so a button keeps its size and its place
 * in the tab order while it is out of sight — and `pointer-events` with it, so
 * an invisible cross cannot be clicked by accident.
 */
.plan-grip-remove,
.plan-insert,
.plan-align {
	opacity: 0;
	pointer-events: none;
	transition: opacity var(--duration-fast) var(--ease-out);
	border-radius: var(--radius-sm);
	background: var(--color-page);
	outline: var(--edge-width) solid var(--color-control-edge);
	outline-offset: calc(-1 * var(--edge-width));
	color: var(--color-text-quaternary);
}

.plan-grip-remove[data-plan-shown],
.plan-align[data-plan-shown],
.plan-grip-remove:focus-visible,
.plan-align:focus-visible,
.plan-rail:hover .plan-insert,
.plan-insert:focus-visible {
	opacity: 1;
	pointer-events: auto;
}

.plan-grip-remove:hover,
.plan-insert:hover,
.plan-align:hover {
	color: var(--color-text-primary);
	outline-color: var(--color-brand);
}

/* Drawn rather than lettered: at fifteen pixels a glyph is a smudge, and these
   have to read at a glance in the margin of a paragraph. */
.plan-grip-remove::before,
.plan-grip-remove::after,
.plan-insert::before,
.plan-insert::after {
	content: "";
	position: absolute;
	inset: 50% 25%;
	border-top: 1.5px solid currentcolor;
	translate: 0 -50%;
}

.plan-grip-remove::before {
	rotate: 45deg;
}

.plan-grip-remove::after {
	rotate: -45deg;
}

.plan-insert::after {
	rotate: 90deg;
}

/*
 * The alignment button reads as what it does: two lines, the lower one short
 * and sitting where the text will. A column with no alignment of its own shows
 * the same figure at half strength rather than a fourth icon, because "no
 * alignment" and "left" render identically in the table and a control claiming
 * otherwise would be lying about the source.
 */
.plan-align::before,
.plan-align::after {
	content: "";
	position: absolute;
	left: 3px;
	right: 3px;
	border-top: 1.5px solid currentcolor;
}

.plan-align::before {
	top: 5px;
}

.plan-align::after {
	top: 9px;
}

.plan-align[data-plan-align="default"] {
	opacity: 0;
}

.plan-align[data-plan-align="default"][data-plan-shown],
.plan-align[data-plan-align="default"]:focus-visible {
	opacity: 0.55;
}

.plan-align[data-plan-align="default"]::after,
.plan-align[data-plan-align="left"]::after {
	right: 7px;
}

.plan-align[data-plan-align="center"]::after {
	left: 5px;
	right: 5px;
}

.plan-align[data-plan-align="right"]::after {
	left: 7px;
}

/* Where the drag will land. A hairline, because it is a position rather than a
   region: anything wider reads as the width of what is being moved. */
.plan-drop {
	background: var(--color-brand);
	border-radius: 1px;
	pointer-events: none;
}

.plan-table-action-toolbar {
	position: fixed;
	z-index: 50;
	display: block;
	max-width: calc(100vw - 1rem);
	padding: 0.25rem;
	border-radius: var(--radius-lg);
	background: var(--color-page);
	box-shadow: var(--shadow-overlay);
}

.plan-table-action-groups,
.plan-table-action-panel {
	display: grid;
	grid-template-columns: repeat(4, minmax(0, 1fr));
	gap: 0.25rem;
}

.plan-table-action-panel {
	grid-template-columns: repeat(2, minmax(0, 1fr));
	padding-block-start: 0.25rem;
	border-block-start: var(--edge-width) solid var(--color-edge);
}

.plan-table-action {
	width: 100%;
	min-width: 0;
	min-height: 44px;
	padding: 0.375rem 0.5rem;
	border-radius: var(--radius-md);
	color: var(--color-text-secondary);
	font-size: var(--text-sm);
	line-height: 1.15;
}

.plan-table-action[aria-expanded="true"] {
	background: var(--color-selected);
	color: var(--color-text-primary);
}

.plan-table-action:hover,
.plan-table-action:focus-visible {
	background: var(--color-hover);
	color: var(--color-text-primary);
}

.plan-table-action:disabled {
	opacity: 0.45;
}

@media (prefers-reduced-motion: reduce) {
	.plan-grip,
	.plan-grip-remove,
	.plan-insert {
		transition: none;
	}
}

/* Remote cursors --------------------------------------------------------- */

/*
 * The frame remote cursors are measured against. It wraps the prose and grows
 * with it, so carets scroll with the text they belong to.
 */
.plan .plan-frame {
	position: relative;
}

/*
 * Lexical owns the caret's geometry — position, height and offsets are written
 * inline on every paint — and hands us the peer's colour as a custom property.
 * Only appearance belongs here. The shadow widens a 1px caret that would
 * otherwise be easy to miss, without fighting the inline width.
 */
.plan .plan-cursor {
	background-color: var(--lexical-cursor-color, currentColor);
	box-shadow: 0 0 0 0.5px var(--lexical-cursor-color, currentColor);
	border-radius: 1px;
}

.plan .plan-cursor-name {
	position: absolute;
	inset-block-end: 100%;
	inset-inline-start: -1px;
	margin-block-end: 2px;
	padding: 0 0.25rem;
	border-radius: var(--radius-sm);
	background: var(--lexical-cursor-color, currentColor);
	color: var(--color-page);
	font-size: var(--text-sm);
	line-height: 1rem;
	font-weight: 500;
	white-space: nowrap;
	max-inline-size: min(20rem, calc(100cqi - 2rem));
	overflow: hidden;
	text-overflow: ellipsis;
	pointer-events: none;
	opacity: 0;
	transition: opacity var(--duration-base) var(--ease-out);
}

/* Raised while its peer is moving, then left to fade. */
.plan .plan-cursor[data-plan-active] .plan-cursor-name {
	opacity: 1;
}

/*
 * Where selections fall back to rect overlays, because the browser has no
 * Highlight API. The supported path is styled by Lexical from the same colour.
 */
.plan .plan-cursor-selection-bg {
	background-color: color-mix(in srgb, var(--lexical-cursor-color, currentColor) 30%, transparent);
}

@media (prefers-reduced-motion: reduce) {
	.plan * {
		transition: none !important;
		animation: none !important;
	}

	/*
	 * Without the fade, a label would blink in and out on every keystroke a
	 * peer makes. Leaving it up is the quieter of the two.
	 */
	.plan .plan-cursor-name {
		opacity: 1;
	}
}

/* Rendered previews ------------------------------------------------------ */

.plan-content [data-plan-preview]:empty {
	display: none;
}

/*
 * On the message rather than on the slot: everything in the slot is React's
 * now, including this, so the attribute goes on the element that says so
 * rather than on the element that holds it.
 */
.plan-content [data-plan-preview] [data-plan-error] {
	color: var(--color-destructive);
	font-size: var(--text-sm);
	padding: 0.5rem 0;
}

/*
 * Coloured code, and diffs.
 *
 * The renderer paints inside a shadow root, so none of the rules above reach
 * it and none of its reach out. What crosses is inherited: the custom
 * properties it reads for type, which are set here so a fence and its source
 * are the same size in the same face, and nothing else.
 */
.plan-content .plan-code-view {
	--diffs-font-family: ui-monospace, SFMono-Regular, monospace;
	--diffs-font-size: var(--text-sm);
	--diffs-line-height: 1.5;
	--diffs-tab-size: 2;
	--diffs-header-font-family: var(--font-sans);

	max-inline-size: 100%;
	overflow-x: auto;
}

/* The renderer's shadow root owns syntax painting; this host supplies the
 * readable width that the surrounding widget scrolls when a line exceeds it. */
.plan-content .plan-code-view > diffs-container {
	min-inline-size: max-content;
}

/* Each file in a patch is its own box, and they stack. */
.plan-content .plan-code-view diffs-container + diffs-container {
	display: block;
	margin-block-start: 0.5rem;
}

/* Source stays visible and editable beneath its preview. */
.plan-content [data-plan-source] {
	white-space: pre-wrap;
	overflow-wrap: normal;
	font-family: ui-monospace, SFMono-Regular, monospace;
	font-size: var(--text-sm);
}

/*
 * A general sibling, not an adjacent one: the block's chrome sits between the
 * preview and the source, and a block has exactly one source anyway.
 */
.plan-content [data-plan-preview]:not(:empty) ~ [data-plan-source] {
	opacity: 0.6;
	font-size: var(--text-sm);
}

/*
 * A block formula is an editable region exactly like a code block, and has to
 * read as one: the rendered result on the page, its source in a box below.
 *
 * A code block gets that box from the generic `pre` rule, and a formula renders
 * the same structure into plain `div`s — so without this it is a bare line of
 * monospace with no background, no padding and nothing in it, and inserting one
 * looks like the command did nothing at all. The box belongs to the source
 * alone; wrapping the preview too would put the rendered formula in a grey
 * well, which is not what a diagram does.
 */
.plan-content .planMath[data-plan-inline="false"] [data-plan-source] {
	--ace-formula-inset-block: 0.75rem;
	--ace-formula-inset-inline: 1rem;

	/*
	 * No `display` here. A `div` is already block, so declaring it again buys
	 * nothing — and this selector outranks the rule that hides the source when
	 * the block is collapsed, which would keep a formula on screen forever.
	 */
	position: relative;
	background: var(--color-inset);
	border-radius: var(--radius-md);
	padding: var(--ace-formula-inset-block) var(--ace-formula-inset-inline);
	overflow-x: auto;
}

/*
 * A formula has no header row, so its show-source toggle sits in the block's
 * top-end corner instead of on a line of its own below the result. The preview's
 * scrollport stops short of it on both sides, so a long formula scrolls without
 * passing underneath and a centred one stays centred.
 */
.plan-content .planMath[data-plan-inline="false"] {
	position: relative;
}

.plan-content .planMath[data-plan-inline="false"] [data-plan-preview]:not(:empty) {
	margin-inline: calc(var(--spacing) * 8);
}

.plan-content .planMath[data-plan-inline="false"] [data-plan-chrome="block"] {
	position: absolute;
	inset-block-start: 0;
	inset-inline-end: 0;
	z-index: 1;
}

/* Revealed on hover or focus where a pointer can hover; always shown on touch. */
@media (hover: hover) and (pointer: fine) {
	.plan-content .planMath[data-plan-inline="false"] .plan-code-toggle[aria-expanded="false"] {
		opacity: 0;
		transition: opacity var(--duration-fast) var(--ease-out);
	}

	.plan-content .planMath[data-plan-inline="false"]:is(:hover, :focus-within) .plan-code-toggle {
		opacity: 1;
	}
}

/*
 * Say what belongs in an empty one. Lexical fills an empty block with a managed
 * line break, so `:empty` never matches and the placeholder keys off that
 * instead. It sits out of flow so it cannot displace the caret in front of it,
 * which means it has to repeat the padding the caret is already inside.
 */
.plan-content
	.planMath[data-plan-inline="false"]
	[data-plan-source]:has(> br[data-lexical-managed-linebreak]:only-child)::before {
	content: "LaTeX, e.g. E = mc^2";
	position: absolute;
	inset-block-start: var(--ace-formula-inset-block);
	inset-inline-start: var(--ace-formula-inset-inline);
	color: var(--color-text-quaternary);
	pointer-events: none;
}

/*
 * Showing a result without its source.
 *
 * Not the `hidden` attribute: a formula's source sets `display: block`, which
 * outranks the user agent's rule for `hidden` and would leave it on screen.
 */
.plan-content [data-plan-collapsed] [data-plan-source] {
	display: none;
}

.plan-content [data-plan-preview] svg {
	max-width: 100%;
	height: auto;
}

.plan-content .plan-diagram {
	max-inline-size: 100%;
	overflow-x: auto;
	overflow-y: hidden;
	overscroll-behavior-inline: contain;
}

.plan-content .plan-diagram svg {
	display: block;
	max-width: none;
	margin-inline: auto;
}

/*
 * A code block is one box: header, rendered code, source. A border rather than
 * an outline, because the renderer paints over an inset outline.
 */
.plan-content .planCode {
	display: flex;
	flex-direction: column;
	margin-block: 1em;
	overflow: hidden;
	border: var(--edge-width) solid var(--color-edge);
	border-radius: var(--radius-lg);
	background: var(--color-page);
}

.plan-content .planCode [data-plan-chrome="block"] {
	order: -1;
	padding: 0.25rem;
	border-block-end: var(--edge-width) solid var(--color-edge);
	background: var(--color-inset);
}

.plan-content .plan-code-toggle[aria-expanded="true"] {
	background: var(--color-brand-wash);
	color: var(--color-brand);
}

/* A global icon colour rule would otherwise keep the icon grey. */
.plan-content .plan-code-toggle[aria-expanded="true"] [data-nucleo-icon] {
	color: inherit;
}

.plan-content .plan-code-language-label {
	padding-inline: 0.5rem;
	font-size: var(--text-sm);
	color: var(--color-text-tertiary);
}

.plan-content .planCode .plan-code-view {
	border-radius: 0;
}

/*
 * One left edge for every line of text in the block: the language label,
 * rendered code, and source all start 0.75rem in. The renderer pads each line
 * by 1ch inside its shadow root, so its wrapper supplies the remainder in the
 * same monospace face. Diffs keep their gutter, which is its own column.
 */
.plan-content .planCode .plan-code-view[data-view="file"] {
	/* The renderer adds 8px above its code and 8px below; make both 0.75rem. */
	padding-block: calc(0.75rem - 8px);
	padding-inline-start: calc(0.75rem - 1ch);
	font-family: ui-monospace, SFMono-Regular, monospace;
	font-size: var(--text-sm);
}

/*
 * Editable code and formula source also stays at 16px on touch, so iOS does
 * not zoom. The rendered code follows so a fence and its source still match.
 */
@media (pointer: coarse) {
	.plan-content :is(pre, [data-plan-source]),
	.plan-content [data-plan-preview]:not(:empty) ~ [data-plan-source],
	.plan-content .planCode .plan-code-view[data-view="file"] {
		font-size: max(1rem, var(--text-sm));
	}

	.plan-content .plan-code-view {
		--diffs-font-size: max(1rem, var(--text-sm));
	}
}

.plan-content .planCode [data-plan-source] {
	margin: 0;
	padding-inline: 0.75rem;
	border-radius: 0;
	background: var(--color-page);
}

.plan-content .planCode [data-plan-preview]:not(:empty) ~ [data-plan-source] {
	border-block-start: var(--edge-width) solid var(--color-edge);
	background: var(--color-inset);
}

.plan-content .planCode [data-plan-preview] :is(.plan-diagram, [data-plan-error]) {
	padding-inline: 0.75rem;
}

/* Diagram error callout. */
.plan-content .planCode [data-plan-preview] [data-plan-error]:has(.plan-error-badge) {
	display: flex;
	align-items: flex-start;
	gap: 0.625rem;
	margin: 0.75rem;
	padding: 0.625rem 0.75rem;
	border-radius: var(--radius-md);
	background: var(--color-ruby-2);
}

.plan-content .plan-error-badge {
	display: grid;
	flex-shrink: 0;
	place-items: center;
	width: 1.5rem;
	height: 1.5rem;
	border-radius: 50%;
	background: var(--color-danger-surface);
	color: var(--color-destructive);
}

.plan-content .plan-error-badge [data-nucleo-icon] {
	color: inherit;
}

.plan-content .plan-error-text {
	min-width: 0;
}

.plan-content .plan-error-title {
	display: block;
	font-size: var(--text-sm);
	font-weight: 600;
	color: var(--color-destructive-ink);
}

.plan-content .plan-error-message {
	margin: 0.125rem 0 0;
	font-size: var(--text-sm);
	color: var(--color-destructive-ink);
	overflow-wrap: anywhere;
	line-height: var(--text-sm--line-height);
}

.plan-content .plan-error-detail {
	margin: 0.5rem 0 0;
	padding: 0;
	overflow-x: auto;
	background: transparent;
	font-size: var(--text-xs);
	line-height: var(--text-xs--line-height);
	color: var(--color-destructive-ink);
}

.plan-content .plan-error-expected {
	margin: 0.375rem 0 0;
	font-size: var(--text-sm);
	line-height: var(--text-sm--line-height);
	color: var(--color-destructive-ink);
	overflow-wrap: anywhere;
}

.plan-content .plan-code-title {
	min-width: 0;
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
	font-size: var(--text-sm);
	color: var(--color-text-secondary);
}

.plan-content .plan-code-title::before {
	content: "·";
	margin-inline: 0.125rem 0.375rem;
	color: var(--color-text-quaternary);
}

/* Tabs ------------------------------------------------------------------- */

.plan-content [data-plan-chrome="tabs"] {
	margin-block-end: 0.5rem;
}

.plan-content [data-plan-panels] > [hidden] {
	display: none;
}

/* Status ----------------------------------------------------------------- */

/*
 * Floats over the end of the prose rather than taking a row from it. Never
 * interactive, so it stays out of the way of selecting the text underneath.
 */
.plan-status {
	position: absolute;
	z-index: 2;
	inset-block-end: 0.75rem;
	inset-inline-end: 0.75rem;
	display: flex;
	align-items: center;
	gap: 0.375rem;
	max-width: min(22rem, calc(100% - 1.5rem));
	pointer-events: none;
	font-size: var(--text-sm);
	line-height: var(--text-sm--line-height);
}

/*
 * A hidden state is not `display: none`: the label stays in the accessibility
 * tree so the live region keeps reporting durability. With every child
 * screen-reader-only the box collapses to nothing on screen.
 */
.plan-status[data-level="notice"] {
	padding: 0.25rem 0.625rem;
	border-radius: var(--radius-full);
	background: var(--color-page);
	outline: var(--edge-width) solid var(--color-edge);
	outline-offset: calc(-1 * var(--edge-width));
	box-shadow: var(--shadow-resting);
}

.plan-status-dot {
	flex: none;
	width: 0.375rem;
	height: 0.375rem;
	border-radius: var(--radius-full);
	background: currentColor;
}

/* What the agent changed ------------------------------------------------- */

/*
 * Marks that take no space and add no element.
 *
 * An agent editing below the fold must not shift the sentence somebody is in
 * the middle of typing, and a mark that expires a few seconds later must not
 * shift it back. So a block is washed, and a hole is drawn in `box-shadow` on
 * the edge of the block still beside it. A `::before` rule was the obvious way
 * to draw a hole and is the wrong one: it needs the block to become a
 * containing block, which re-anchors any absolutely positioned widget chrome
 * inside it for as long as the mark is up.
 *
 * Two colours, and they mean different things. `ring` is prose that was
 * written; `muted-foreground` is structure that moved or went, where no words
 * are new. Where the agent is working *now* is not said here at all — that is
 * its cursor, which comes and goes with the turn rather than waiting to be
 * read.
 */
.plan .plan-content [data-plan-change] {
	transition: background var(--duration-linger) var(--ease-out);
}

/* Written just now. */
.plan .plan-content [data-plan-change="added"] {
	background: var(--color-brand-wash);
}

/*
 * Moved, not written. In the structural colour rather than a fainter version
 * of the one above: the words are ones the reader may already have read, and
 * saying "new, but less so" about them would not be true.
 */
.plan .plan-content [data-plan-change="moved"] {
	background: color-mix(in oklch, var(--color-text-quaternary) 9%, transparent);
}

/*
 * A hole where something was.
 *
 * One block can hold a hole above it and another below — delete the second and
 * fourth of four blocks and the third carries both — so the two sides cannot
 * each set `box-shadow`, or the cascade would keep only whichever rule came
 * last and one hairline would silently never draw. Custom properties do
 * cascade independently, so each side sets one and they compose here.
 */
.plan .plan-content [data-plan-gap-before],
.plan .plan-content [data-plan-gap-after] {
	box-shadow:
		var(--plan-gap-above, 0 0 transparent),
		var(--plan-gap-below, 0 0 transparent);
	transition: box-shadow var(--duration-linger) var(--ease-out);
}

.plan .plan-content [data-plan-gap-before="removed"] {
	--plan-gap-above: 0 -0.375rem 0 -0.3125rem var(--color-text-quaternary);
}

.plan .plan-content [data-plan-gap-after="removed"] {
	--plan-gap-below: 0 0.375rem 0 -0.3125rem var(--color-text-quaternary);
}

/*
 * Where a block left from, as opposed to where one was deleted. Fainter, since
 * nothing was lost — the content is still in the plan, further up or down.
 */
.plan .plan-content [data-plan-gap-before="vacated"] {
	--plan-gap-above: 0 -0.375rem 0 -0.34375rem color-mix(
		in oklch,
		var(--color-text-quaternary) 55%,
		transparent
	);
}

.plan .plan-content [data-plan-gap-after="vacated"] {
	--plan-gap-below: 0 0.375rem 0 -0.34375rem color-mix(
		in oklch,
		var(--color-text-quaternary) 55%,
		transparent
	);
}

/*
 * The agent wrote this block and the reader is pointing at a card that refers
 * to it.
 *
 * Only reachable where there is no Highlight API, since that is the only path
 * on which a sidecar mark touches the element's own background. The two rules
 * have equal specificity, so without saying so the later one — this file's —
 * would simply replace the earlier and the pointer would lose its wash.
 * Pointing is something the reader just did and the agent's mark is ambient,
 * so the pointer wins; the gutter bar is in `box-shadow` and survives either
 * way.
 */
.plan .plan-content [data-plan-related][data-plan-change] {
	background: var(--color-brand-wash);
}

/* Reaching the ones off screen ------------------------------------------- */

/*
 * One chip per edge, over the prose rather than in it, and only while
 * something in that direction is still unread. Opposite the status chip at the
 * bottom, which is why the lower one sits inline-start of it.
 */
.plan-changes {
	position: absolute;
	z-index: 3;
	inset-inline-start: 50%;
	translate: -50% 0;
	display: flex;
	flex-direction: column;
	gap: 0.375rem;
	max-width: min(24rem, calc(100% - 1.5rem));
}

.plan-changes[data-side="above"] {
	inset-block-start: 0.75rem;
}

.plan-changes[data-side="below"] {
	inset-block-end: 0.75rem;
	flex-direction: column-reverse;
}

.plan-changes-bar {
	display: flex;
	align-self: center;
	align-items: stretch;
	border-radius: var(--radius-full);
	background: var(--color-page);
	outline: var(--edge-width) solid var(--color-edge);
	outline-offset: calc(-1 * var(--edge-width));
	box-shadow: var(--shadow-resting);
	font-size: var(--text-sm);
	line-height: var(--text-sm--line-height);
	max-inline-size: 100%;
}

.plan-changes-go,
.plan-changes-more {
	min-inline-size: 0;
	display: flex;
	align-items: center;
	gap: 0.375rem;
	padding: 0.25rem 0.625rem;
	color: var(--color-text-primary);
	cursor: pointer;
}

.plan-changes-more {
	border-start-end-radius: var(--radius-full);
	border-end-end-radius: var(--radius-full);
	padding-inline: 0.375rem;
	border-inline-start: var(--edge-width) solid var(--color-edge);
}

.plan-changes-go {
	border-start-start-radius: var(--radius-full);
	border-end-start-radius: var(--radius-full);
}

.plan-changes-go:hover,
.plan-changes-more:hover {
	background: var(--color-brand-wash);
}

.plan-changes-list,
.plan-changes-empty {
	margin: 0;
	padding: 0.375rem;
	max-height: 12rem;
	overflow-y: auto;
	list-style: none;
	border-radius: var(--radius-md);
	background: var(--color-page);
	outline: var(--edge-width) solid var(--color-edge);
	outline-offset: calc(-1 * var(--edge-width));
	box-shadow: var(--shadow-overlay);
	font-size: var(--text-sm);
	line-height: var(--text-sm--line-height);
}

.plan-changes-empty {
	padding: 0.5rem 0.625rem;
	color: var(--color-text-quaternary);
}

.plan-changes-item {
	display: flex;
	gap: 0.5rem;
	padding: 0.25rem 0.5rem;
	border-radius: var(--radius-sm);
}

.plan-changes-kind {
	flex: none;
	font-weight: 600;
	color: var(--color-text-tertiary);
}

/* Still waiting to be reached, as opposed to already shown and counted down. */
.plan-changes-item[data-unread] {
	background: var(--color-brand-wash);
}

.plan-changes-item[data-unread]::before {
	content: "";
	flex: none;
	width: 0.375rem;
	height: 0.375rem;
	margin-block-start: 0.4375rem;
	border-radius: var(--radius-full);
	background: var(--color-brand);
}

.plan-changes-item[data-unread] .plan-changes-kind {
	color: var(--color-text-primary);
}

.plan-changes-item[data-kind="removed"] .plan-changes-text {
	color: var(--color-text-secondary);
	text-decoration: line-through;
}

/* One line each: this is an index, not a diff. */
.plan-changes-text {
	overflow: hidden;
	white-space: nowrap;
	text-overflow: ellipsis;
}

::highlight(plan-decided) {
	background-color: var(--color-success-wash);
}
/* Presence on a decision card: aligned to the 1.5rem mark beside the title. */
.presence-faces {
	display: flex;
	flex: none;
	align-items: center;
	block-size: 1.5rem;
}

.presence-face + .presence-face {
	margin-inline-start: -0.375rem;
}

.presence-more {
	margin-inline-start: 0.25rem;
	font-size: var(--text-xs);
	font-weight: 600;
	color: var(--color-text-tertiary);
	font-variant-numeric: tabular-nums;
}

/*
 * A resolved decision: a margin marker beside the prose it produced.
 *
 * Reader-local chrome drawn over the document like the comment layer, and
 * for the same reason: nothing here may move a collaborative line box.
 */
::highlight(plan-decision) {
	background-color: var(--color-success-wash);
}

/* A card carried by markers takes no room in the plan. */
.plan .plan-content [data-plan-questionnaire]:has([data-plan-collapsed]) {
	margin-block: 0;
}

.plan-decision-layer {
	pointer-events: none;
	position: absolute;
	inset: 0;
	z-index: 2;
}

.plan-decision-marker {
	--plan-decision-hit: 1.25rem;
	pointer-events: auto;
	position: absolute;
	display: grid;
	place-items: center;
	inline-size: var(--plan-decision-hit);
	block-size: var(--plan-decision-hit);
	padding: 0;
	border-radius: var(--radius-full);
}

/* A touch screen gets the comment button's 44px target around the same disc. */
:root[data-plan-coarse-pointer] .plan-decision-marker {
	--plan-decision-hit: 2.75rem;
}

.plan-decision-disc {
	display: grid;
	place-items: center;
	inline-size: 1.25rem;
	block-size: 1.25rem;
	border-radius: var(--radius-full);
	background: var(--color-success-wash);
	color: var(--color-success);
}

/* Too narrow a gutter for a disc: a slim bar the height of the first line. */
.plan-decision-marker[data-compact] {
	place-items: center start;
	border-radius: 0;
}

.plan-decision-marker[data-compact] .plan-decision-disc {
	inline-size: 0.25rem;
	block-size: var(--plan-decision-line, 1lh);
	margin-inline-start: var(--plan-decision-bar, 0px);
	background: var(--color-success);
}

.plan-decision-marker[data-compact] svg {
	display: none;
}

.plan-decision-marker:hover .plan-decision-disc,
.plan-decision-marker[aria-expanded="true"] .plan-decision-disc {
	outline: var(--edge-width) solid var(--color-success);
}

.plan-decision-pop {
	max-width: none;
	padding: 0.75rem;
	border-radius: var(--radius-lg);
	font-size: var(--text-sm);
	line-height: var(--text-sm--line-height);
}

.plan-decision-pop[data-pinned] {
	pointer-events: auto;
}

.plan-decision-pop p {
	margin: 0;
}

.plan-decision-head {
	display: flex;
	align-items: flex-start;
	gap: 0.5rem;
}

.plan-decision-question {
	flex: 1;
	line-height: var(--text-xs--line-height);
	font-weight: 500;
	color: var(--color-text-secondary);
}

.plan-decision-pop .plan-decision-tools {
	display: flex;
	margin: -0.125rem -0.25rem 0 0;
	opacity: 0;
	pointer-events: none;
	transition: opacity var(--duration-fast) var(--ease-out);
}

/* The close button is a compact 24px, like the comment card's. */
.plan-decision-tools .btn-icon {
	inline-size: 1.5rem;
	block-size: 1.5rem;
	min-inline-size: 1.5rem;
	min-block-size: 1.5rem;
	padding: 0;
}

.plan-decision-pop[data-pinned] .plan-decision-tools {
	opacity: 1;
	pointer-events: auto;
}

.plan-decision-pop .plan-decision-answer {
	display: flex;
	align-items: center;
	gap: 0.375rem;
	margin-block-start: 0.375rem;
	font-size: var(--text-sm);
	font-weight: 500;
	color: var(--color-success);
}

.plan-decision-pop .plan-decision-answer > span {
	display: inline;
	margin: 0;
	color: var(--color-text-primary);
}

/* What was not chosen: same size, lighter weight, a grey cross in the check's place. */
.plan-decision-pop .plan-decision-answer[data-rejected] {
	margin-block-start: 0.25rem;
	font-weight: 400;
	color: var(--color-text-quaternary);
}

.plan-decision-pop .plan-decision-answer[data-rejected] > span {
	color: var(--color-text-secondary);
}

.plan-decision-meta {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	column-gap: 1rem;
	row-gap: 0.5rem;
	/* A clear space separates what was decided from who and when. */
	margin-block-start: 1rem;
	font-size: var(--text-xs);
	line-height: var(--text-xs--line-height);
	color: var(--color-text-tertiary);
}

.plan-decision-pop .plan-decision-meta > p {
	display: flex;
	align-items: flex-start;
	gap: 0.375rem;
	min-width: 0;
	overflow-wrap: anywhere;
}

.plan-decision-meta > p > :first-child {
	flex: none;
}

.plan-decision-meta > p > svg {
	margin-block: calc((1lh - 0.875rem) / 2);
}

.plan-decision-meta > p > :is(img, [role="img"]) {
	margin-block: calc((1lh - 1.125rem) / 2);
}

.plan-decision-pop .plan-decision-meta span {
	display: inline;
	margin: 0;
	color: inherit;
}

.plan-decision-meta strong {
	font-weight: 500;
	color: var(--color-text-secondary);
}

.plan-decision-fold {
	display: grid;
	grid-template-rows: 0fr;
	transition: grid-template-rows var(--duration-base) var(--ease-out);
}

.plan-decision-fold > div {
	overflow: hidden;
}

.plan-decision-pop[data-pinned] .plan-decision-fold {
	grid-template-rows: 1fr;
}

@media (prefers-reduced-motion: reduce) {
	.plan-decision-fold,
	.plan-decision-tools,
	.plan-decision-disc {
		transition: none;
	}
}