/* =========================================================
   Lesson player — tone colors (extend the shared palette
   from css/style.css without touching its variables)
   ========================================================= */
:root {
	--tone-info-bg: var(--blue-soft);
	--tone-info-border: var(--blue);
	--tone-info-text: var(--blue-dark);

	--tone-warning-bg: #fdf3e0;
	--tone-warning-border: #c9861a;
	--tone-warning-text: #7a5210;

	--tone-success-bg: var(--teal-soft);
	--tone-success-border: var(--teal);
	--tone-success-text: var(--teal-dark);

	--tone-danger-bg: #fbe8e8;
	--tone-danger-border: #c94343;
	--tone-danger-text: #8a2323;
}

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

/* ---- Compact lesson header ----
   Same brand sizing/height as the homepage .navbar so the two headers read
   as one site; only the link/control set on the right is simplified. */
.lesson-header-bar {
	padding: 0.1rem 1rem;
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 1rem;
	flex-wrap: wrap;
}

.lesson-header-actions {
	display: flex;
	align-items: center;
	gap: 1.25rem;
	flex-wrap: wrap;
}

.lesson-back-link {
	color: var(--nav-text);
	text-decoration: none;
	font-weight: 600;
	font-size: 0.9375rem;
	border-bottom: 0.15em solid transparent;
	padding-bottom: 0.15em;
}

.lesson-back-link:hover {
	color: var(--nav-text-hover);
	border-bottom-color: var(--teal);
}

/* ---- Lesson main / stage shell ---- */
.lesson-main {
	width: 100%;
	max-width: 52rem;
	margin: 0 auto;
	padding: clamp(1rem, 3vh, 2rem) 1.25rem 3rem;
	display: flex;
	flex-direction: column;
	gap: 1.25rem;
	flex: 1 0 auto;
}

.lesson-progress {
	display: flex;
	flex-direction: column;
	gap: 0.5rem;
}

/* [hidden] ties in specificity with the class rules above/below and loses to
   whichever was declared later, so it needs an explicit override here. */
.lesson-progress[hidden],
.lesson-nav[hidden] {
	display: none;
}

.lesson-progress-top {
	display: flex;
	align-items: baseline;
	justify-content: space-between;
	gap: 1rem;
}

.lesson-title {
	margin: 0;
	font-family: "Space Grotesk", "Nunito Sans", sans-serif;
	font-size: 1.15rem;
	font-weight: 700;
	color: var(--blue-dark);
}

.lesson-position {
	flex-shrink: 0;
	font-size: 0.875rem;
	font-weight: 600;
	color: var(--text-muted);
}

.progress-track {
	height: 0.6rem;
	border-radius: 999px;
	background: var(--card-border);
	overflow: hidden;
}

.progress-fill {
	height: 100%;
	width: 0%;
	border-radius: inherit;
	background: linear-gradient(90deg, var(--blue), var(--teal));
	transition: width 0.25s ease;
}

/* ---- Slide stage ---- */
.lesson-stage {
	background: var(--card-bg);
	border: 1px solid var(--card-border);
	border-radius: var(--radius-lg);
	box-shadow: var(--shadow-md);
	padding: clamp(1.5rem, 4vw, 3rem);
	min-height: 16rem;
}

.lesson-stage:focus-visible {
	outline: 3px solid var(--focus);
	outline-offset: 4px;
}

.lesson-loading {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	gap: 1rem;
	padding: 3rem 1rem;
	color: var(--text-muted);
	text-align: center;
}

.spinner {
	width: 2.5rem;
	height: 2.5rem;
	border-radius: 50%;
	border: 0.3rem solid var(--card-border);
	border-top-color: var(--blue);
	animation: spin 0.8s linear infinite;
}

@keyframes spin {
	to { transform: rotate(360deg); }
}

/* ---- Fatal / inline error views ---- */
.lesson-error {
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 1rem;
	text-align: center;
	padding: 2rem 1rem;
}

.lesson-error-icon {
	font-size: 2.5rem;
}

.lesson-error h2 {
	margin: 0;
	color: var(--blue-dark);
	font-family: "Space Grotesk", "Nunito Sans", sans-serif;
}

.lesson-error p {
	margin: 0;
	max-width: 32rem;
	color: var(--text-muted);
}

.lesson-error-actions {
	display: flex;
	gap: 0.75rem;
	flex-wrap: wrap;
	justify-content: center;
	margin-top: 0.5rem;
}

.inline-notice {
	display: flex;
	align-items: flex-start;
	gap: 0.6rem;
	background: var(--tone-warning-bg);
	border: 1px solid var(--tone-warning-border);
	color: var(--tone-warning-text);
	border-radius: var(--radius-sm);
	padding: 0.85rem 1rem;
	font-size: 0.9375rem;
	margin: 0.75rem 0;
}

/* ---- Title slide ---- */
.slide-title-page {
	display: flex;
	flex-direction: column;
	align-items: center;
	text-align: center;
	gap: 1rem;
}

.slide-cover {
	width: 100%;
	max-width: 22rem;
	aspect-ratio: 16 / 9;
	border-radius: var(--radius-md);
	overflow: hidden;
	background: linear-gradient(135deg, var(--blue-soft), var(--teal-soft));
	display: flex;
	align-items: center;
	justify-content: center;
	margin-bottom: 0.25rem;
}

.slide-cover img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	display: block;
}

.slide-cover.is-placeholder img {
	width: 4rem;
	height: 4rem;
	object-fit: contain;
}

.slide-title-page h2 {
	margin: 0;
	font-family: "Space Grotesk", "Nunito Sans", sans-serif;
	font-size: clamp(1.6rem, 3.4vw, 2.25rem);
	color: var(--blue-dark);
	line-height: 1.15;
}

.slide-subtitle {
	margin: 0;
	max-width: 34rem;
	color: var(--text-muted);
	font-size: 1.0625rem;
}

.slide-meta {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	gap: 0.5rem;
	margin: 0.25rem 0 0.5rem;
}

.slide-meta-pill {
	background: var(--teal-soft);
	color: var(--teal-dark);
	border-radius: 999px;
	padding: 0.3rem 0.85rem;
	font-size: 0.8125rem;
	font-weight: 700;
	text-transform: capitalize;
}

/* ---- Content slide ---- */
.slide-content h2.slide-heading {
	margin: 0 0 1.25rem;
	font-family: "Space Grotesk", "Nunito Sans", sans-serif;
	font-size: clamp(1.3rem, 2.6vw, 1.75rem);
	color: var(--blue-dark);
	max-width: 38rem;
}

.slide-content {
	max-width: 40rem;
	margin: 0 auto;
	display: flex;
	flex-direction: column;
	gap: 1rem;
}

.block-heading {
	margin: 0.5rem 0 0;
	font-size: 1.125rem;
	font-weight: 700;
	color: var(--blue-dark);
}

.block-paragraph {
	margin: 0;
	font-size: 1.0625rem;
	line-height: 1.65;
}

.block-list {
	margin: 0;
	padding-left: 1.4rem;
	display: flex;
	flex-direction: column;
	gap: 0.5rem;
	font-size: 1.0625rem;
	line-height: 1.55;
}

.block-callout {
	display: flex;
	gap: 0.65rem;
	align-items: flex-start;
	border-radius: var(--radius-sm);
	border: 1px solid;
	padding: 0.9rem 1.1rem;
	font-size: 1rem;
	line-height: 1.55;
}

.block-callout .callout-icon {
	flex-shrink: 0;
	font-size: 1.15rem;
	line-height: 1;
	margin-top: 0.1rem;
}

.block-callout .callout-body {
	display: flex;
	flex-direction: column;
	gap: 0.2rem;
}

.block-callout .callout-label {
	font-weight: 700;
	font-size: 0.8125rem;
	text-transform: uppercase;
	letter-spacing: 0.04em;
}

.tone-info {
	background: var(--tone-info-bg);
	border-color: var(--tone-info-border);
	color: var(--tone-info-text);
}

.tone-warning {
	background: var(--tone-warning-bg);
	border-color: var(--tone-warning-border);
	color: var(--tone-warning-text);
}

.tone-success {
	background: var(--tone-success-bg);
	border-color: var(--tone-success-border);
	color: var(--tone-success-text);
}

.tone-danger {
	background: var(--tone-danger-bg);
	border-color: var(--tone-danger-border);
	color: var(--tone-danger-text);
}

.block-figure {
	margin: 0;
	display: flex;
	flex-direction: column;
	gap: 0.5rem;
	align-items: center;
}

.block-figure img,
.block-figure video {
	max-width: 100%;
	width: 100%;
	height: auto;
	border-radius: var(--radius-md);
	display: block;
	background: var(--blue-soft);
}

.block-figure figcaption {
	font-size: 0.875rem;
	color: var(--text-muted);
	text-align: center;
}

/* ---- Knowledge check ---- */
.quiz-fieldset {
	border: none;
	margin: 0;
	padding: 0;
}

.slide-quiz-question {
	margin: 0 0 1rem;
	font-size: 1.0625rem;
	font-weight: 700;
	color: var(--text);
}

.quiz-choices {
	list-style: none;
	margin: 0 0 1.25rem;
	padding: 0;
	display: flex;
	flex-direction: column;
	gap: 0.65rem;
}

.quiz-choice {
	display: flex;
	align-items: flex-start;
	gap: 0.65rem;
	border: 1.5px solid var(--card-border);
	border-radius: var(--radius-sm);
	padding: 0.75rem 0.95rem;
	cursor: pointer;
	transition: border-color 0.15s ease, background-color 0.15s ease;
}

.quiz-choice:hover {
	border-color: var(--blue);
}

.quiz-choice.is-selected {
	border-color: var(--blue);
	background: var(--blue-soft);
}

.quiz-choice input[type="radio"] {
	margin-top: 0.2rem;
	width: 1.15rem;
	height: 1.15rem;
	accent-color: var(--blue);
	flex-shrink: 0;
}

.quiz-choice-text {
	font-size: 1rem;
	line-height: 1.5;
}

.quiz-choice.is-disabled {
	cursor: default;
	opacity: 0.85;
}

.quiz-actions {
	display: flex;
	gap: 0.75rem;
	align-items: center;
	flex-wrap: wrap;
}

.quiz-feedback {
	margin-top: 1.1rem;
	border-radius: var(--radius-sm);
	border: 1.5px solid;
	padding: 0.9rem 1.1rem;
	display: flex;
	gap: 0.65rem;
	align-items: flex-start;
}

.quiz-feedback .feedback-icon {
	font-size: 1.2rem;
	flex-shrink: 0;
}

.quiz-feedback .feedback-title {
	font-weight: 700;
	margin: 0 0 0.25rem;
}

.quiz-feedback .feedback-text {
	margin: 0;
	font-size: 0.9688rem;
	line-height: 1.5;
}

.quiz-feedback.is-correct {
	background: var(--tone-success-bg);
	border-color: var(--tone-success-border);
	color: var(--tone-success-text);
}

.quiz-feedback.is-incorrect {
	background: var(--tone-danger-bg);
	border-color: var(--tone-danger-border);
	color: var(--tone-danger-text);
}

/* ---- Completion screen ---- */
.slide-complete {
	display: flex;
	flex-direction: column;
	align-items: center;
	text-align: center;
	gap: 1rem;
	padding: 1rem 0;
}

.slide-complete .complete-icon {
	width: 4rem;
	height: 4rem;
	border-radius: 50%;
	background: var(--tone-success-bg);
	color: var(--tone-success-text);
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: 2rem;
}

.slide-complete h2 {
	margin: 0;
	font-family: "Space Grotesk", "Nunito Sans", sans-serif;
	color: var(--blue-dark);
	font-size: 1.75rem;
}

.slide-complete p {
	margin: 0;
	max-width: 30rem;
	color: var(--text-muted);
}

/* ---- Footer navigation ---- */
.lesson-nav {
	display: flex;
	justify-content: space-between;
	gap: 1rem;
}

.lesson-nav-btn {
	min-width: 8rem;
	text-align: center;
	font-weight: 700;
}

.lesson-nav-btn:disabled {
	opacity: 0.45;
	cursor: not-allowed;
	transform: none !important;
	box-shadow: none !important;
}

/* ---- Modal (restart confirmation) ---- */
.modal-overlay {
	position: fixed;
	inset: 0;
	background: rgba(20, 56, 79, 0.45);
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 1rem;
	z-index: 300;
}

.modal-dialog {
	background: var(--card-bg);
	border-radius: var(--radius-lg);
	box-shadow: var(--shadow-md);
	padding: 1.5rem;
	max-width: 26rem;
	width: 100%;
	display: flex;
	flex-direction: column;
	gap: 0.85rem;
}

.modal-dialog h2 {
	margin: 0;
	color: var(--blue-dark);
	font-size: 1.25rem;
}

.modal-dialog p {
	margin: 0;
	color: var(--text-muted);
}

.modal-actions {
	display: flex;
	justify-content: flex-end;
	gap: 0.75rem;
	margin-top: 0.5rem;
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 640px) {
	.lesson-main {
		padding: 1rem 1rem 2rem;
	}

	.lesson-stage {
		padding: 1.25rem;
		border-radius: var(--radius-md);
	}

	.lesson-nav {
		flex-direction: column-reverse;
	}

	.lesson-nav-btn {
		width: 100%;
		padding: 0.9rem 1rem;
		font-size: 1.0625rem;
	}

	.quiz-choice {
		padding: 0.85rem 1rem;
	}
}

@media (prefers-reduced-motion: reduce) {
	.spinner {
		animation: none;
		border-top-color: var(--card-border);
	}

	.progress-fill {
		transition: none;
	}
}