/* =============================================================
   controls.css — Buttons, Form Controls, Canvas Legend,
                  Toast, Empty State, Utility
   Companion to components.css. Requires tokens.css.
   All values reference tokens.css custom properties only.
   ============================================================= */

/* ===========================================================
   1. BUTTON components
   =========================================================== */
.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: var(--s-2);
	min-height: 44px;
	min-width: 44px;
	padding: var(--s-2) var(--s-4);
	font-family: var(--font-body);
	font-size: var(--size-md);
	font-weight: var(--weight-bold);
	line-height: 1;
	border-radius: var(--r-1);
	border: 2px solid transparent;
	cursor: pointer;
	text-decoration: none;
	user-select: none;
	white-space: nowrap;
	transition:
		background-color var(--transition),
		color var(--transition),
		border-color var(--transition),
		box-shadow var(--transition),
		opacity var(--transition),
		transform var(--transition);
}

/* Primary */
.btn-primary {
	background: var(--accent);
	color: var(--bg);
	border-color: var(--accent);
}

.btn-primary:hover {
	background: var(--fg);
	border-color: var(--fg);
	color: var(--bg);
}

.btn-primary:focus-visible {
	outline: 2px solid var(--accent);
	outline-offset: 2px;
	box-shadow: 0 0 0 4px rgb(255 107 53 / 20%);
}

.btn-primary:active {
	opacity: 0.85;
	transform: translateY(1px);
}

/* Secondary / ghost */
.btn-secondary {
	background: transparent;
	color: var(--fg);
	border-color: var(--border);
}

.btn-secondary:hover {
	border-color: var(--fg);
	background: var(--state-empty);
}
.btn-secondary:focus-visible {
	outline: 2px solid var(--accent);
	outline-offset: 2px;
}
.btn-secondary:active {
	opacity: 0.75;
	transform: translateY(1px);
}

/* Icon-only (play / pause / reset) */
.btn-icon {
	background: transparent;
	color: var(--fg);
	border-color: var(--border);
	padding: var(--s-2);
	width: 44px;
	height: 44px;
}

.btn-icon:hover {
	background: var(--state-empty);
	border-color: var(--muted);
}
.btn-icon:focus-visible {
	outline: 2px solid var(--accent);
	outline-offset: 2px;
}
.btn-icon:active {
	opacity: 0.75;
	transform: translateY(1px);
}

/* Playback control group — 2x2 grid */
.btn-group {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: var(--s-2);
	align-items: stretch;
}

.btn-group > .btn {
	min-width: 0;
	padding-left: var(--s-2);
	padding-right: var(--s-2);
	justify-content: center;
}

/* ===========================================================
   2. FORM CONTROLS — label, field row
   =========================================================== */
.field-label {
	display: block;
	font-size: var(--size-sm);
	font-weight: var(--weight-bold);
	color: var(--fg);
	margin-bottom: var(--s-1);
}

.field-row {
	display: flex;
	flex-direction: column;
	gap: var(--s-1);
	margin-bottom: var(--s-4);
}

/* Select */
.select {
	display: block;
	width: 100%;
	min-height: 44px;
	padding: var(--s-2) var(--s-3);
	font-family: var(--font-body);
	font-size: var(--size-md);
	color: var(--fg);
	background-color: var(--bg);
	border: 1px solid var(--border);
	border-radius: var(--r-1);
	cursor: pointer;
	appearance: none;
	background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236b7280' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
	background-repeat: no-repeat;
	background-position: right var(--s-3) center;
	padding-right: calc(var(--s-3) + 24px);
	transition:
		border-color var(--transition),
		box-shadow var(--transition);
}

.select:hover {
	border-color: var(--muted);
}
.select:focus-visible {
	outline: none;
	border-color: var(--accent);
	box-shadow: 0 0 0 3px rgb(255 107 53 / 15%);
}
.select:active {
	opacity: 0.9;
}

/* Range slider */
.slider {
	appearance: none;
	width: 100%;
	height: 4px;
	border-radius: var(--r-0);
	background: var(--border);
	cursor: pointer;
	outline: none;
	margin: var(--s-2) 0;
	transition: background var(--transition);
}

.slider:hover {
	background: var(--muted);
}

.slider::-webkit-slider-thumb {
	appearance: none;
	width: 20px;
	height: 20px;
	border-radius: 50%;
	background: var(--accent);
	cursor: pointer;
	border: 2px solid var(--bg);
	box-shadow: var(--shadow-sm);
	transition:
		background var(--transition),
		transform var(--transition);
}

.slider::-moz-range-thumb {
	width: 20px;
	height: 20px;
	border-radius: 50%;
	background: var(--accent);
	cursor: pointer;
	border: 2px solid var(--bg);
	box-shadow: var(--shadow-sm);
	transition:
		background var(--transition),
		transform var(--transition);
}

.slider::-webkit-slider-thumb:hover {
	transform: scale(1.2);
}
.slider::-moz-range-thumb:hover {
	transform: scale(1.2);
}

.slider:focus-visible {
	outline: 2px solid var(--accent);
	outline-offset: 3px;
	border-radius: var(--r-1);
}

/* Slider with value readout */
.slider-row {
	display: flex;
	align-items: center;
	gap: var(--s-3);
}

.slider-row .slider {
	flex: 1;
}

.slider-value {
	font-family: var(--font-mono);
	font-size: var(--size-sm);
	color: var(--muted);
	min-width: 48px;
	text-align: right;
	flex-shrink: 0;
}

/* Checkbox */
.checkbox-row {
	display: flex;
	align-items: center;
	gap: var(--s-2);
	min-height: 44px;
	cursor: pointer;
}

.checkbox {
	appearance: none;
	width: 20px;
	height: 20px;
	border: 2px solid var(--border);
	border-radius: var(--r-1);
	background: var(--bg);
	cursor: pointer;
	flex-shrink: 0;
	position: relative;
	transition:
		border-color var(--transition),
		background-color var(--transition);
}

.checkbox:hover {
	border-color: var(--accent);
}
.checkbox:focus-visible {
	outline: 2px solid var(--accent);
	outline-offset: 2px;
}
.checkbox:active {
	opacity: 0.75;
}

.checkbox:checked {
	background: var(--accent);
	border-color: var(--accent);
}

.checkbox:checked::after {
	content: "";
	position: absolute;
	top: 3px;
	left: 6px;
	width: 5px;
	height: 9px;
	border: 2px solid var(--bg);
	border-top: none;
	border-left: none;
	transform: rotate(45deg);
}

.checkbox-label {
	font-size: var(--size-md);
	color: var(--fg);
	user-select: none;
}

/* ===========================================================
   3. CANVAS / GRID rendering hints
   =========================================================== */
.grid-canvas {
	display: block;
	width: 100%;
	height: auto;
	image-rendering: pixelated;
	image-rendering: crisp-edges;
}

/* ===========================================================
   4. CELL STATE LEGEND
   =========================================================== */
.legend {
	display: flex;
	flex-wrap: wrap;
	gap: var(--s-3);
	margin-top: var(--s-4);
}

.legend__item {
	display: flex;
	align-items: center;
	gap: var(--s-1);
	font-size: var(--size-sm);
	color: var(--muted);
}

.legend__swatch {
	width: 16px;
	height: 16px;
	border-radius: var(--r-1);
	flex-shrink: 0;
	border: 1px solid rgb(0 0 0 / 8%);
}

.legend__swatch--start {
	background: var(--state-start);
}
.legend__swatch--goal {
	background: var(--state-goal);
}
.legend__swatch--wall {
	background: var(--state-wall);
}
.legend__swatch--open {
	background: var(--state-open);
}
.legend__swatch--closed {
	background: var(--state-closed);
}
.legend__swatch--path {
	background: var(--state-path);
}
.legend__swatch--empty {
	background: var(--state-empty);
	border-color: var(--border);
}

/* ===========================================================
   5. TOAST notification
   =========================================================== */
.toast {
	position: fixed;
	bottom: var(--s-6);
	left: 50%;
	transform: translateX(-50%) translateY(120%);
	background: var(--fg);
	color: var(--bg);
	padding: var(--s-2) var(--s-4);
	border-radius: var(--r-1);
	font-size: var(--size-sm);
	font-weight: var(--weight-bold);
	z-index: var(--z-modal);
	box-shadow: var(--shadow-md);
	transition: transform var(--transition);
	white-space: nowrap;
	pointer-events: none;
}

.toast--visible {
	transform: translateX(-50%) translateY(0);
}

/* ===========================================================
   6. EMPTY STATE
   =========================================================== */
.empty-state {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	text-align: center;
	padding: var(--s-8) var(--s-4);
	gap: var(--s-3);
	color: var(--muted);
}

.empty-state__icon {
	font-size: 48px;
	line-height: 1;
	opacity: 0.4;
}

.empty-state__title {
	font-family: var(--font-display);
	font-size: var(--size-lg);
	font-weight: var(--weight-bold);
	color: var(--fg);
}

.empty-state__body {
	font-size: var(--size-md);
	max-width: 36ch;
}

/* ===========================================================
   7. SKIP NAV (accessibility)
   =========================================================== */
.skip-nav {
	position: absolute;
	top: -100%;
	left: var(--s-4);
	background: var(--accent);
	color: var(--bg);
	padding: var(--s-2) var(--s-4);
	font-weight: var(--weight-bold);
	border-radius: var(--r-1);
	z-index: calc(var(--z-header) + 1);
	text-decoration: none;
	transition: top var(--transition);
}

.skip-nav:focus {
	top: var(--s-2);
}

/* ===========================================================
   8. UTILITY — container, visually hidden, text helpers
   =========================================================== */
.container {
	width: 100%;
	max-width: 1200px;
	margin-inline: auto;
	padding-inline: var(--s-4);
}

.sr-only {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip-path: inset(50%);
	white-space: nowrap;
	border: 0;
}

.text-muted {
	color: var(--muted);
}
.text-accent {
	color: var(--accent);
}
.text-sm {
	font-size: var(--size-sm);
}
.text-mono {
	font-family: var(--font-mono);
}