/**
 * Review Board quiz styles -- split-panel question list + detail.
 *
 * Uses lrn-rb__* prefix. All values reference --lrn-* tokens.
 *
 * @package Learnomy
 */

/* ==========================================================================
   Top bar: progress + timer + submit
   ========================================================================== */

.lrn-rb__top-bar {
	position: sticky;
	top: 0;
	z-index: 10;
	display: flex;
	align-items: center;
	gap: var(--lrn-sp-4);
	padding: var(--lrn-sp-3) var(--lrn-sp-4);
	background: var(--lrn-bg);
	background: color-mix(in srgb, var(--lrn-bg) 85%, transparent);
	-webkit-backdrop-filter: blur(12px);
	backdrop-filter: blur(12px);
	border-bottom: 1px solid var(--lrn-border);
	border-radius: var(--lrn-radius-lg) var(--lrn-radius-lg) 0 0;
}

.lrn-rb__progress-text {
	font-size: var(--lrn-text-sm);
	font-weight: var(--lrn-weight-medium);
	color: var(--lrn-text-secondary);
	white-space: nowrap;
}

.lrn-rb__top-bar .lrn-quiz__timer {
	margin-inline-start: auto;
}

.lrn-rb__submit-btn {
	flex-shrink: 0;
}

/* When there's no timer, push submit to the right */
.lrn-rb__top-bar .lrn-quiz__timer[hidden] + .lrn-rb__submit-btn {
	margin-inline-start: auto;
}

/* ==========================================================================
   Two-column grid layout
   ========================================================================== */

.lrn-rb__grid {
	display: grid;
	grid-template-columns: 280px 1fr;
	min-height: calc(100vh - 64px);
	min-height: calc(100dvh - 64px);
}

/* ==========================================================================
   Left panel: sidebar question list
   ========================================================================== */

.lrn-rb__sidebar {
	display: flex;
	flex-direction: column;
	border-inline-end: 1px solid var(--lrn-border);
	background: var(--lrn-bg-muted);
	overflow: hidden;
}

/* Filter pills */
.lrn-rb__filters {
	display: flex;
	gap: var(--lrn-sp-1);
	padding: var(--lrn-sp-3);
	border-bottom: 1px solid var(--lrn-divider);
	flex-shrink: 0;
}

.lrn-rb__filter-pill {
	flex: 1;
	padding: var(--lrn-sp-1) var(--lrn-sp-2);
	font-size: var(--lrn-text-xs);
	font-weight: var(--lrn-weight-medium);
	font-family: var(--lrn-font);
	color: var(--lrn-text-secondary);
	background: transparent;
	border: 1px solid var(--lrn-border);
	border-radius: var(--lrn-radius-full);
	cursor: pointer;
	transition: all var(--lrn-dur) var(--lrn-ease);
	white-space: nowrap;
	text-align: center;
}

.lrn-rb__filter-pill:hover {
	border-color: var(--lrn-accent);
	color: var(--lrn-accent);
}

.lrn-rb__filter-pill--active {
	background: var(--lrn-accent);
	border-color: var(--lrn-accent);
	color: var(--lrn-white);
}

.lrn-rb__filter-pill--active:hover {
	background: var(--lrn-accent-hover);
	border-color: var(--lrn-accent-hover);
	color: var(--lrn-white);
}

/* Scrollable question list */
.lrn-rb__question-list {
	flex: 1;
	overflow-y: auto;
	padding: var(--lrn-sp-2) 0;
}

/* Individual list item */
.lrn-rb__list-item {
	display: flex;
	align-items: center;
	gap: var(--lrn-sp-2);
	width: 100%;
	padding: var(--lrn-sp-2) var(--lrn-sp-3);
	background: transparent;
	border: none;
	border-inline-start: 3px solid transparent;
	font-family: var(--lrn-font);
	font-size: var(--lrn-text-sm);
	color: var(--lrn-text);
	cursor: pointer;
	text-align: start;
	transition: all var(--lrn-dur) var(--lrn-ease);
}

.lrn-rb__list-item:hover {
	background: var(--lrn-accent-bg);
}

/* Current question -- blue left border + subtle background */
.lrn-rb__list-item--current {
	border-inline-start-color: var(--lrn-accent);
	background: var(--lrn-accent-bg);
}

/* Answered indicator on list item */
.lrn-rb__list-item--answered .lrn-rb__list-item-status {
	color: var(--lrn-success);
}

/* Flagged indicator on list item */
.lrn-rb__list-item--flagged .lrn-rb__list-item-status {
	color: var(--lrn-warn);
}

.lrn-rb__list-item-number {
	flex-shrink: 0;
	width: var(--lrn-sp-6);
	font-weight: var(--lrn-weight-semibold);
	font-size: var(--lrn-text-xs);
	color: var(--lrn-text-tertiary);
	text-align: center;
}

.lrn-rb__list-item-title {
	flex: 1;
	min-width: 0;
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
	color: var(--lrn-text-secondary);
}

.lrn-rb__list-item-status {
	flex-shrink: 0;
	display: flex;
	align-items: center;
	justify-content: center;
	color: var(--lrn-text-tertiary);
}

.lrn-rb__list-item-status svg,
.lrn-rb__list-item-status i {
	width: 14px;
	height: 14px;
}

/* ==========================================================================
   Right panel: active question detail
   ========================================================================== */

.lrn-rb__main {
	display: flex;
	flex-direction: column;
	padding: var(--lrn-sp-6);
}

.lrn-rb__question-header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	margin-bottom: var(--lrn-sp-4);
}

.lrn-rb__question-number {
	font-size: var(--lrn-text-sm);
	font-weight: var(--lrn-weight-semibold);
	color: var(--lrn-text-tertiary);
	text-transform: uppercase;
	letter-spacing: 0.05em;
}

/* Flag button */
.lrn-rb__flag-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: var(--lrn-sp-8);
	height: var(--lrn-sp-8);
	border: 1px solid var(--lrn-border);
	border-radius: var(--lrn-radius-md);
	background: transparent;
	color: var(--lrn-text-tertiary);
	cursor: pointer;
	transition: all var(--lrn-dur) var(--lrn-ease);
}

.lrn-rb__flag-btn:hover {
	border-color: var(--lrn-warn);
	color: var(--lrn-warn);
}

.lrn-rb__flag-btn--active {
	background: var(--lrn-warn-bg);
	border-color: var(--lrn-warn);
	color: var(--lrn-warn);
}

.lrn-rb__flag-btn svg,
.lrn-rb__flag-btn i {
	width: 16px;
	height: 16px;
}

/* ==========================================================================
   Mobile bottom sheet (< 768px)
   ========================================================================== */

.lrn-rb__bottom-sheet {
	display: none;
}

@media (max-width: 768px) {
	/* Single column on mobile */
	.lrn-rb__grid {
		display: block;
	}

	/* Hide desktop sidebar */
	.lrn-rb__sidebar {
		display: none;
	}

	/* Show bottom sheet */
	.lrn-rb__bottom-sheet {
		display: block;
		position: fixed;
		bottom: 0;
		left: 0;
		right: 0;
		z-index: 20;
		background: var(--lrn-bg);
		border-top: 1px solid var(--lrn-border);
		border-radius: var(--lrn-radius-xl) var(--lrn-radius-xl) 0 0;
		box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.1);
		box-shadow: 0 -4px 16px color-mix(in srgb, var(--lrn-text) 10%, transparent);
		transform: translateY(calc(100% - 48px));
		transition: transform 0.3s var(--lrn-ease);
		max-height: 70vh;
		max-height: 70dvh;
	}

	.lrn-rb__bottom-sheet--open {
		transform: translateY(0);
	}

	/* Peek handle bar */
	.lrn-rb__bottom-sheet-handle {
		display: flex;
		flex-direction: column;
		align-items: center;
		gap: var(--lrn-sp-1);
		width: 100%;
		padding: var(--lrn-sp-3);
		background: transparent;
		border: none;
		cursor: pointer;
		font-family: var(--lrn-font);
	}

	.lrn-rb__bottom-sheet-bar {
		width: 36px;
		height: 4px;
		background: var(--lrn-border-heavy);
		border-radius: 2px;
	}

	.lrn-rb__bottom-sheet-label {
		font-size: var(--lrn-text-xs);
		color: var(--lrn-text-secondary);
		font-weight: var(--lrn-weight-medium);
	}

	/* Bottom sheet inner content */
	.lrn-rb__bottom-sheet-content {
		overflow-y: auto;
		max-height: calc(70vh - 48px);
		max-height: calc(70dvh - 48px);
		padding-bottom: var(--lrn-sp-4);
	}

	/* Main panel adjustments for bottom sheet clearance */
	.lrn-rb__main {
		padding: var(--lrn-sp-4) var(--lrn-sp-3);
		padding-bottom: var(--lrn-sp-16); /* clearance for peek bar */
	}
}

/* ==========================================================================
   Responsive: tablet adjustments
   ========================================================================== */

@media (min-width: 768px) and (max-width: 1024px) {
	.lrn-rb__grid {
		grid-template-columns: 220px 1fr;
	}

	.lrn-rb__list-item-title {
		display: none;
	}
}

/* ==========================================================================
   Reduced motion
   ========================================================================== */

@media ( prefers-reduced-motion: reduce ) {
	.lrn-rb__bottom-sheet {
		transition: none;
	}
}

/* Small phones — plan-02 phase D */
@media (max-width: 640px) {
	.lrn-rb__question,
	.lrn-rb__card {
		padding: var(--lrn-sp-3);
	}

	.lrn-rb__timer {
		font-size: var(--lrn-text-sm);
	}

	.lrn-rb__nav,
	.lrn-rb__actions {
		flex-direction: column;
		gap: var(--lrn-sp-2);
	}

	.lrn-rb__nav .lrn-btn,
	.lrn-rb__actions .lrn-btn {
		width: 100%;
		justify-content: center;
	}
}

/* ── Category-grouped navigator (BC #9993397735) ────────────────────────── */
.lrn-rb__cat-group {
	border-bottom: 1px solid var(--lrn-divider);
}

.lrn-rb__cat-header {
	display: flex;
	align-items: center;
	gap: var(--lrn-sp-2);
	width: 100%;
	padding: var(--lrn-sp-2) var(--lrn-sp-3);
	background: var(--lrn-bg-muted);
	border: 0;
	font: inherit;
	font-weight: 600;
	color: var(--lrn-text);
	cursor: pointer;
	text-align: start;
	position: sticky;
	top: 0;
	z-index: 1;
}

.lrn-rb__cat-header:hover {
	background: var(--lrn-accent-bg);
}

.lrn-rb__cat-chevron {
	flex: none;
	width: 1em;
	height: 1em;
	transition: transform var(--lrn-dur) var(--lrn-ease);
}

.lrn-rb__cat-group.is-collapsed .lrn-rb__cat-chevron {
	transform: rotate(-90deg);
}

.lrn-rb__cat-name {
	flex: 1 1 auto;
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}

.lrn-rb__cat-count {
	flex: none;
	color: var(--lrn-text-secondary);
	font-weight: 500;
	font-variant-numeric: tabular-nums;
}

.lrn-rb__cat-items[hidden] {
	display: none;
}