/**
 * Learnomy — lesson EMBEDDED variant: two-column sidebar layout.
 *
 * Layered on top of lesson-player.css (handle dep `learnomy-lesson-player`),
 * but this variant does NOT use the collapsible player markup — it is a
 * purpose-built grid: a wide main reading column + a PERSISTENT right rail
 * (course-lessons nav, never collapses). Renders inside the active theme.
 *
 * Token-driven only (--lrn-*); dark mode + RTL inherit from root tokens and
 * logical properties. Responsive: the rail stacks below the main column under
 * ~900px. Variant root class `.lrn-lesson--embedded`.
 *
 * @package Learnomy
 */

.lrn-lesson--embedded {
	margin-block: var(--lrn-sp-8);
}

/* ── Two-column grid ──────────────────────────────────────────────────── */
.lrn-lesson--embedded .lrn-lesson-layout {
	display:               grid;
	grid-template-columns: 1fr 20rem;
	gap:                   var(--lrn-sp-8);
	align-items:           start;
}

.lrn-lesson--embedded .lrn-lesson-main {
	min-width: 0; /* let the column shrink instead of overflowing the grid */
}

/* ── Quiet placeholder surfaces (preroll / below-video / completion / ad) ──
   The wrapper div is only emitted when a listener produced content (the
   buffered partials/surface.php), so an unhooked surface leaves no trace.
   When present, the slot reads as an intentional, bordered region. */
.lrn-lesson--embedded .lrn-lesson-preroll-surface,
.lrn-lesson--embedded .lrn-lesson-below-video-surface,
.lrn-lesson--embedded .lrn-lesson-completion-surface {
	margin-block: var(--lrn-sp-4);
	padding:      var(--lrn-sp-4);
	border:       1px solid var(--lrn-border);
	border-radius: var(--lrn-radius-md);
	background:   var(--lrn-bg-muted);
}

.lrn-lesson--embedded .lrn-lesson-sidebar-ad-surface {
	margin-block-end: var(--lrn-sp-4);
	padding:          var(--lrn-sp-4);
	border:           1px solid var(--lrn-border);
	border-radius:    var(--lrn-radius-md);
	background:       var(--lrn-bg-muted);
}

/* The hidden pause surface never paints; [hidden] is enough but we belt-and-
   brace so an injected child can't force it visible before the JS reveal. */
.lrn-lesson--embedded .lrn-lesson-pause-surface[hidden] {
	display: none;
}

/* ── Media block ──────────────────────────────────────────────────────── */
.lrn-lesson--embedded .lrn-player-content__video,
.lrn-lesson--embedded .lrn-player-content__audio,
.lrn-lesson--embedded .lrn-player-content__pdf,
.lrn-lesson--embedded .lrn-player-content__embed {
	margin-block-end: var(--lrn-sp-6);
	border-radius:    var(--lrn-radius-lg);
	overflow:         hidden;
}

/* Cap media so a tall PDF / embed doesn't dominate the in-theme page. */
.lrn-lesson--embedded .lrn-player-content__pdf .lrn-lesson-pdf,
.lrn-lesson--embedded .lrn-player-content__embed .lrn-lesson-embed {
	height: clamp(24rem, 60vh, 44rem);
	width:  100%;
	border: 0;
}

/* ── Lesson meta header ───────────────────────────────────────────────── */
.lrn-lesson--embedded .lrn-lesson-meta {
	margin-block-end: var(--lrn-sp-6);
}

.lrn-lesson--embedded .lrn-lesson-meta__breadcrumb {
	display:          flex;
	flex-wrap:        wrap;
	align-items:      center;
	gap:              var(--lrn-sp-2);
	margin-block-end: var(--lrn-sp-2);
	font-size:        var(--lrn-text-sm);
	color:            var(--lrn-text-muted);
}

.lrn-lesson--embedded .lrn-lesson-meta__breadcrumb a {
	color:           var(--lrn-text-secondary);
	text-decoration: none;
}

.lrn-lesson--embedded .lrn-lesson-meta__breadcrumb a:hover {
	color: var(--lrn-accent);
}

.lrn-lesson--embedded .lrn-lesson-meta__title {
	margin:      0 0 var(--lrn-sp-4);
	font-size:   var(--lrn-text-2xl);
	font-weight: var(--lrn-weight-semibold);
	color:       var(--lrn-text);
	line-height: 1.2;
}

/* Single-line byline — instructor + facts share one row, wrapping only when
   the viewport is too narrow to hold them. */
.lrn-lesson--embedded .lrn-lesson-meta__byline {
	display:          flex;
	align-items:      center;
	flex-wrap:        wrap;
	gap:              var(--lrn-sp-2) var(--lrn-sp-4);
	margin-block-end: var(--lrn-sp-4);
}

.lrn-lesson--embedded .lrn-lesson-meta__instructor {
	display:     inline-flex;
	align-items: center;
	gap:         var(--lrn-sp-2);
}

.lrn-lesson--embedded .lrn-lesson-meta__avatar {
	border-radius: 50%;
	flex:          0 0 auto;
}

.lrn-lesson--embedded .lrn-lesson-meta__instructor-text {
	font-size: var(--lrn-text-sm);
	color:     var(--lrn-text-secondary);
}

.lrn-lesson--embedded .lrn-lesson-meta__instructor-name {
	color:           var(--lrn-text);
	font-weight:     var(--lrn-weight-medium);
	text-decoration: none;
}

.lrn-lesson--embedded .lrn-lesson-meta__instructor-name:hover {
	color: var(--lrn-accent);
}

.lrn-lesson--embedded .lrn-lesson-meta__fact {
	display:     inline-flex;
	align-items: center;
	gap:         var(--lrn-sp-2);
	font-size:   var(--lrn-text-sm);
	color:       var(--lrn-text-muted);
}

.lrn-lesson--embedded .lrn-lesson-meta__fact svg {
	width:  1rem;
	height: 1rem;
}

/* ── Persistent right rail ────────────────────────────────────────────── */
.lrn-lesson--embedded .lrn-lesson-side {
	position:      sticky;
	top:           var(--lrn-sp-6);
	display:       block;
}

.lrn-lesson--embedded .lrn-lesson-side__nav {
	border:        1px solid var(--lrn-border);
	border-radius: var(--lrn-radius-lg);
	background:    var(--lrn-bg);
	overflow:      hidden;
}

.lrn-lesson--embedded .lrn-lesson-side__header {
	display:          flex;
	flex-wrap:        wrap;
	align-items:      baseline;
	justify-content:  space-between;
	gap:              var(--lrn-sp-2);
	padding:          var(--lrn-sp-4) var(--lrn-sp-5);
	border-block-end: 1px solid var(--lrn-border);
	background:       var(--lrn-bg-muted);
}

.lrn-lesson--embedded .lrn-lesson-side__title {
	font-size:       var(--lrn-text-md);
	font-weight:     var(--lrn-weight-semibold);
	color:           var(--lrn-text);
	text-decoration: none;
}

.lrn-lesson--embedded .lrn-lesson-side__title:hover {
	color: var(--lrn-accent);
}

.lrn-lesson--embedded .lrn-lesson-side__progress {
	font-size: var(--lrn-text-xs);
	color:     var(--lrn-text-muted);
}

.lrn-lesson--embedded .lrn-lesson-side__list {
	max-height: clamp(20rem, 60vh, 40rem);
	overflow-y: auto;
	padding:    var(--lrn-sp-2) 0;
}

.lrn-lesson--embedded .lrn-lesson-side__section {
	padding-block: var(--lrn-sp-2);
}

.lrn-lesson--embedded .lrn-lesson-side__section-name {
	margin:         0;
	padding:        var(--lrn-sp-2) var(--lrn-sp-5);
	font-size:      var(--lrn-text-xs);
	font-weight:    var(--lrn-weight-semibold);
	letter-spacing: 0.02em;
	text-transform: uppercase;
	color:          var(--lrn-text-muted);
}

.lrn-lesson--embedded .lrn-lesson-side__items {
	margin:     0;
	padding:    0;
	list-style: none;
}

.lrn-lesson--embedded .lrn-lesson-side__item {
	display:        flex;
	align-items:    center;
	gap:            var(--lrn-sp-3);
	padding:        var(--lrn-sp-2) var(--lrn-sp-5);
	font-size:      var(--lrn-text-sm);
	border-inline-start: 2px solid transparent;
}

.lrn-lesson--embedded .lrn-lesson-side__item--sub {
	padding-inline-start: var(--lrn-sp-8);
}

.lrn-lesson--embedded .lrn-lesson-side__item--current {
	background:          var(--lrn-bg-muted);
	border-inline-start-color: var(--lrn-accent);
}

.lrn-lesson--embedded .lrn-lesson-side__marker {
	display:         inline-flex;
	align-items:     center;
	justify-content: center;
	flex:            0 0 auto;
	width:           1.5rem;
	height:          1.5rem;
	border-radius:   50%;
	border:          1px solid var(--lrn-border);
	font-size:       var(--lrn-text-xs);
	color:           var(--lrn-text-muted);
}

.lrn-lesson--embedded .lrn-lesson-side__marker svg {
	width:  0.875rem;
	height: 0.875rem;
}

/* A row can be current AND done at once (the lesson you just marked complete).
   The marker draws the check for a done row either way, so `--done` has to win
   the colour or the check renders in the current-row accent and reads as
   "in progress". Same-specificity selectors, so the order here IS the rule:
   `--current` first, `--done` after it. */
.lrn-lesson--embedded .lrn-lesson-side__item--current .lrn-lesson-side__marker {
	color:        var(--lrn-accent);
	border-color: var(--lrn-accent);
}

.lrn-lesson--embedded .lrn-lesson-side__item--done .lrn-lesson-side__marker {
	color:        var(--lrn-success);
	border-color: var(--lrn-success);
}

.lrn-lesson--embedded .lrn-lesson-side__label {
	flex:            1 1 auto;
	min-width:       0;
	color:           var(--lrn-text-secondary);
	text-decoration: none;
	overflow:        hidden;
	text-overflow:   ellipsis;
}

.lrn-lesson--embedded a.lrn-lesson-side__label:hover {
	color: var(--lrn-accent);
}

.lrn-lesson--embedded .lrn-lesson-side__item--current .lrn-lesson-side__label {
	color:       var(--lrn-text);
	font-weight: var(--lrn-weight-medium);
}

.lrn-lesson--embedded .lrn-lesson-side__label.is-locked {
	color:  var(--lrn-text-muted);
	cursor: not-allowed;
}

.lrn-lesson--embedded .lrn-lesson-side__duration {
	flex:      0 0 auto;
	font-size: var(--lrn-text-xs);
	color:     var(--lrn-text-muted);
}

.lrn-lesson--embedded .lrn-lesson-side__footer {
	padding:           var(--lrn-sp-4) var(--lrn-sp-5);
	border-block-start: 1px solid var(--lrn-border);
}

.lrn-lesson--embedded .lrn-lesson-side__footer-text {
	display:    block;
	margin-block-start: var(--lrn-sp-2);
	font-size:  var(--lrn-text-xs);
	color:      var(--lrn-text-muted);
}

/* ── In-theme access gate ─────────────────────────────────────────────── */
.lrn-lesson--embedded.lrn-access-gate {
	min-height:    0;
	padding-block: var(--lrn-sp-12);
}

/* ── Responsive: stack the rail below the main column ─────────────────── */
@media (max-width: 1024px) {
	.lrn-lesson--embedded .lrn-lesson-layout {
		grid-template-columns: 1fr;
	}

	.lrn-lesson--embedded .lrn-lesson-side {
		position: static;
	}

	.lrn-lesson--embedded .lrn-lesson-side__list {
		max-height: none;
	}
}