/* ============================================================
   Академия — курсы. Стили в дизайн-системе проекта (identity.md).
   ============================================================ */

.course {
	--ch-green: #03A87D;
	--ch-green-dark: #09986F;
	--ch-ink: #1A1D27;
	--ch-muted: #727272;
	--ch-line: #DDE5E2;
	--ch-soft: #F4F4F4;
	--ch-warn: #F4F4F4;
	--ch-warn-line: #DC3546;
}

/* ---------- Каркас ---------- */

.course__layout {
	display: grid;
	grid-template-columns: 280px minmax(0, 1fr);
	gap: 2.5em;
	align-items: start;
}

.course-side {
	position: sticky;
	top: 5em;
}

/* Длинное оглавление скроллится внутри липкой колонки, не растягивая страницу. */
@media (min-width: 48em) {
	.course-side__inner {
		max-height: calc(100vh - 6em);
		overflow-y: auto;
		padding-right: 0.5em;
		scrollbar-width: thin;
	}
}

.course-side__toggle,
.course-side__overlay {
	display: none;
}

/* ---------- Сайдбар ---------- */

.course-side__eyebrow {
	display: block;
	font-size: 0.6875em;
	letter-spacing: 0.13em;
	text-transform: uppercase;
	color: var(--ch-green);
	font-weight: 700;
}

.course-side__title {
	font-size: 1.375em;
	line-height: 1.25;
	font-weight: 700;
	margin: 0.625em 0 1.25em;
	letter-spacing: -0.02em;
}

.course-side__progress {
	display: flex;
	justify-content: space-between;
	font-size: 0.75em;
	color: var(--ch-muted);
}

.course-side__track {
	height: 0.375em;
	margin-top: 0.5em;
	border-radius: 999em;
	background: #DDE5E2;
	overflow: hidden;
}

.course-side__bar {
	height: 100%;
	width: 0;
	background: var(--ch-green);
	border-radius: 999em;
	transition: width 0.25s ease;
}

.course-side__cta {
	margin: 1.5em 0;
	padding: 1.25em;
	border-radius: 0.625em;
	background: var(--ch-soft);
	border: 1px solid var(--ch-line);
	font-size: 0.8125em;
	line-height: 1.5;
}

.course-side__cta strong {
	display: block;
	font-size: 1.05em;
	line-height: 1.3;
}

.course-side__cta p {
	margin: 0.375em 0 0.5em;
	color: var(--ch-muted);
}

.course-side__cta a,
.course-side__cta .course-side__cta-btn {
	color: var(--ch-green);
	font-weight: 700;
	text-decoration: none;
}

.course-side__cta .course-side__cta-btn {
	background: none;
	border: none;
	padding: 0;
	margin: 0;
	font: inherit;
	text-align: left;
	cursor: pointer;
}

.course-side__nav {
	list-style: none;
	margin: 1.5em 0 0;
	padding: 0;
	border-top: 1px solid var(--ch-line);
}

.course-side__nav li {
	margin: 0;
}

.course-side__nav a {
	display: grid;
	grid-template-columns: 28px 1fr;
	gap: 0.25em;
	padding: 0.75em 0;
	border-bottom: 1px solid var(--ch-line);
	color: var(--ch-muted);
	font-size: 0.8125em;
	line-height: 1.35;
	text-decoration: none;
	transition: color 0.2s ease;
}

.course-side__nav a:hover {
	color: var(--ch-green);
}

.course-side__nav a.is-current {
	color: var(--ch-ink);
	font-weight: 700;
}

.course-side__nav a.is-done > span:first-child {
	color: var(--ch-green);
	font-weight: 700;
}

.course-side__reset {
	display: block;
	width: 100%;
	margin-top: 1.25em;
	padding: 0.625em 0;
	border: none;
	background: none;
	color: var(--ch-muted);
	font-size: 0.75em;
	text-align: left;
	cursor: pointer;
	transition: color 0.2s ease;
}

.course-side__reset:hover {
	color: var(--ch-warn-line);
}

/* ---------- Оглавление, сгруппированное по модулям ---------- */

.course-side__group {
	margin: 0;
}

.course-side__details {
	border-bottom: 1px solid var(--ch-line);
}

.course-side__summary {
	display: flex;
	align-items: center;
	gap: 0.625em;
	padding: 0.85em 0;
	cursor: pointer;
	list-style: none;
	font-size: 0.8125em;
	line-height: 1.35;
	font-weight: 700;
	color: var(--ch-ink);
}

.course-side__summary::-webkit-details-marker {
	display: none;
}

.course-side__summary::after {
	content: '';
	flex: none;
	width: 0.5em;
	height: 0.5em;
	margin-left: auto;
	border-right: 2px solid var(--ch-muted);
	border-bottom: 2px solid var(--ch-muted);
	transform: rotate(45deg) translateY(-0.125em);
	transition: transform 0.2s ease;
}

.course-side__details[open] > .course-side__summary::after {
	transform: rotate(225deg) translateY(-0.125em);
}

.course-side__summary-num {
	flex: none;
	min-width: 1.75em;
	color: var(--ch-green);
	font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
	font-size: 0.72em;
}

.course-side__summary-name {
	flex: 1;
}

.course-side__group-nav {
	list-style: none;
	margin: 0;
	padding: 0 0 0.625em 1.5em;
}

/* Вложенные задачи урока. */
.course-side__lesson-tasks {
	list-style: none;
	margin: 0;
	padding: 0 0 0.5em 2em;
}

.course-side__lesson-tasks a {
	padding: 0.5em 0;
	font-size: 0.78em;
}

/* Сворачиваемый список задач урока. */
.course-side__tasks {
	margin: 0;
}

.course-side__tasks-summary {
	display: flex;
	align-items: center;
	gap: 0.5em;
	padding: 0.4em 0 0.4em 2em;
	cursor: pointer;
	list-style: none;
	font-size: 0.75em;
	line-height: 1.35;
	font-weight: 700;
	color: var(--ch-muted);
}

.course-side__tasks-summary::-webkit-details-marker {
	display: none;
}

.course-side__tasks-summary::after {
	content: '';
	flex: none;
	width: 0.5em;
	height: 0.5em;
	margin-left: auto;
	border-right: 2px solid var(--ch-muted);
	border-bottom: 2px solid var(--ch-muted);
	transform: rotate(45deg) translateY(-0.125em);
	transition: transform 0.2s ease;
}

.course-side__tasks[open] > .course-side__tasks-summary::after {
	transform: rotate(225deg) translateY(-0.125em);
}

.course-side__tasks-count {
	color: var(--ch-muted);
	font-weight: 400;
	font-size: 0.85em;
}

/* Кнопка «К текущему уроку» — появляется, когда урок ушёл из зоны видимости. */
.course-side__current {
	position: sticky;
	bottom: 0.5em;
	display: inline-flex;
	align-items: center;
	gap: 0.4em;
	margin: 0.75em 0 0;
	padding: 0.5em 0.8em;
	border: 1px solid var(--ch-line);
	border-radius: 999em;
	background: #fff;
	color: var(--ch-muted);
	font-size: 0.75em;
	font-weight: 700;
	line-height: 1;
	cursor: pointer;
	box-shadow: 0 4px 14px rgba(30, 30, 30, 0.08);
	transition: color 0.2s ease, border-color 0.2s ease;
}

.course-side__current:hover {
	color: var(--ch-green);
	border-color: var(--ch-green);
}

.course-side__current[hidden] {
	display: none;
}

/* ---------- Контент урока ---------- */

.course-hero {
	margin-bottom: 1.5em;
	padding-bottom: 1.25em;
	border-bottom: 1px solid var(--ch-line);
}

.course-hero__count {
	display: block;
	font-size: 0.6875em;
	letter-spacing: 0.11em;
	text-transform: uppercase;
	color: var(--ch-green);
	font-weight: 700;
}

.course-hero__title {
	font-size: 1.75em;
	line-height: 1.2;
	letter-spacing: -0.02em;
	margin: 0.375em 0 0;
}

.course-hero__lead {
	margin: 0.5em 0 0;
	font-size: 1em;
	line-height: 1.5;
	color: var(--ch-ink);
}

/* ---------- Блоки ---------- */

.course-block {
	margin: 1.25em 0;
	padding: 1.125em 1.25em;
	border-radius: 0.625em;
}

.course-block__label {
	display: block;
	font-size: 0.6875em;
	letter-spacing: 0.11em;
	text-transform: uppercase;
	color: var(--ch-green);
	font-weight: 700;
}

.course-block__title {
	font-size: 1.125em;
	line-height: 1.3;
	margin: 0.5em 0 0.5em;
}

.course-block__text {
	font-size: 1em;
	line-height: 1.6;
}

.course-block__text h2,
.course-block__text h3,
.course-block__text h4 {
	font-size: 1.125em;
	line-height: 1.3;
	margin: 0.25em 0 0.5em;
}

.course-block__text p {
	margin: 0 0 0.75em;
}

.course-block__text p:last-child {
	margin-bottom: 0;
}

.course-block__text ul,
.course-block__text ol {
	margin: 0.5em 0;
	padding-left: 1.25em;
}

.course-block__text li {
	margin: 0.375em 0;
}

.course-block--goal {
	background: var(--ch-soft);
	border-left: 3px solid var(--ch-green);
}

.course-block--goal .course-block__text {
	font-size: 1.0625em;
}

.course-block--key {
	background: var(--ch-soft);
	border-left: 3px solid var(--ch-green);
}

.course-block--story {
	background: #FDFDFD;
	border: 1px solid var(--ch-line);
}

.course-block--warning {
	background: var(--ch-warn);
	border-left: 3px solid var(--ch-warn-line);
}

.course-block--warning .course-block__label {
	color: #CE5E55;
}

.course-block--practice {
	background: #FDFDFD;
	border: 1px solid #DDE5E2;
}

.course-block--summary {
	background: #FDFDFD;
	border: 1px solid var(--ch-line);
}

/* ---------- Текст урока (the_content) ---------- */

.course-prose {
	font-size: 1em;
	line-height: 1.6;
	color: #1E1E1E;
}

.course-prose > *:first-child {
	margin-top: 0;
}

.course-prose > *:last-child {
	margin-bottom: 0;
}

.course-prose h2 {
	font-size: 1.5em;
	line-height: 1.25;
	font-weight: 700;
	letter-spacing: -0.01em;
	margin: 1.75em 0 0.6em;
}

.course-prose h2:first-child {
	margin-top: 0;
}

.course-prose h3 {
	font-size: 1.25em;
	line-height: 1.3;
	font-weight: 600;
	letter-spacing: -0.01em;
	margin: 1.5em 0 0.5em;
}

.course-prose h4 {
	font-size: 1.125em;
	line-height: 1.35;
	font-weight: 600;
	margin: 1.25em 0 0.4em;
}

.course-prose p {
	margin: 0 0 1em;
}

.course-prose ul,
.course-prose ol {
	margin: 0 0 1.25em;
	padding-left: 1.25em;
}

.course-prose ul {
	list-style: disc;
}

.course-prose ol {
	list-style: decimal;
}

.course-prose li {
	margin-bottom: 0.375em;
}

.course-prose li::marker {
	color: #01A97D;
}

.course-prose a {
	color: #01A97D;
	text-decoration: underline;
	text-decoration-color: rgba(1, 169, 125, 0.4);
	text-underline-offset: 0.2em;
	transition: color 0.2s ease;
}

.course-prose a:hover {
	color: #029F76;
}

.course-prose blockquote {
	margin: 1.25em 0;
	padding: 1em 1.25em;
	background: #ECFBF8;
	border-left: 4px solid #01A97D;
	border-radius: 0 0.625em 0.625em 0;
}

.course-prose code {
	padding: 0.15em 0.4em;
	background: #F5F5F5;
	color: #1E1E1E;
	border-radius: 0.375em;
	font-size: 0.875em;
}

.course-prose pre {
	margin: 1.25em 0;
	padding: 1.125em;
	background: #1E1E1E;
	color: #ECFBF8;
	border-radius: 0.625em;
	overflow-x: auto;
	font-size: 0.9em;
	line-height: 1.6;
}

.course-prose pre code {
	padding: 0;
	background: transparent;
	color: inherit;
}

.course-prose img {
	border-radius: 0.75em;
}

/* ---------- Чекбокс «Урок пройден» ---------- */

.course-complete {
	display: flex;
	align-items: center;
	gap: 0.625em;
	margin: 2em 0 0.5em;
	padding: 1em 1.25em;
	border: 1px solid var(--ch-line);
	border-radius: 0.625em;
	cursor: pointer;
	font-weight: 600;
	transition: border-color 0.2s ease, background-color 0.2s ease;
}

.course-complete:hover {
	border-color: var(--ch-green);
}

.course-complete__input {
	width: 1.25em;
	height: 1.25em;
	accent-color: var(--ch-green);
	flex: none;
	cursor: pointer;
}

/* ---------- Пошаговое раскрытие урока ---------- */

.course-step {
	display: grid;
	grid-template-rows: 0fr;
	opacity: 0;
	scroll-margin-top: 5em;
	transition: grid-template-rows 0.5s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.4s ease;
}

.course-step.is-open {
	grid-template-rows: 1fr;
	opacity: 1;
}

.course-step__inner {
	overflow: hidden;
	min-height: 0;
}

.course-next {
	display: inline-flex;
	align-items: center;
	gap: 0.5em;
	margin: 1.25em 0;
	padding: 0.9375em 1.75em;
	border: none;
	border-radius: 0.625em;
	background: var(--ch-green);
	color: #fff;
	font-weight: 600;
	font-size: 1em;
	line-height: 1.4;
	cursor: pointer;
	transition: background-color 0.2s ease;
}

.course-next:hover {
	background: var(--ch-green-dark);
}

.course-next[hidden] {
	display: none;
}

.course-next__arrow {
	transition: transform 0.2s ease;
}

.course-next:hover .course-next__arrow {
	transform: translateX(3px);
}

.course-next:disabled {
	background: #D7D7D7;
	color: #fff;
	cursor: not-allowed;
	opacity: 0.85;
	transform: none;
}

.course-next:disabled:hover .course-next__arrow {
	transform: none;
}

/* ---------- Интерактивное задание: чек-лист ---------- */

.course-task .course-task__list {
	list-style: none;
	margin: 0.5em 0 0;
	padding: 0;
}

.course-task__item {
	margin: 0;
	border-bottom: 1px solid var(--ch-line);
}

.course-task__item:last-child {
	border-bottom: none;
}

.course-task__item label {
	display: flex;
	align-items: flex-start;
	gap: 0.625em;
	padding: 0.625em 0;
	cursor: pointer;
}

.course-task__input {
	width: 1.125em;
	height: 1.125em;
	margin-top: 0.25em;
	accent-color: var(--ch-green);
	flex: none;
	cursor: pointer;
}

.course-task__text {
	line-height: 1.5;
}

/* ---------- Интерактивное задание: вопросы ---------- */

.course-quiz__question {
	display: none;
}

.course-quiz__question.is-active {
	display: block;
	animation: course-quiz-in 0.3s ease;
}

@keyframes course-quiz-in {
	from {
		opacity: 0;
		transform: translateY(6px);
	}
	to {
		opacity: 1;
		transform: none;
	}
}

.course-quiz__progress {
	height: 0.375em;
	margin-bottom: 1.25em;
	border-radius: 999em;
	background: #DDE5E2;
	overflow: hidden;
}

.course-quiz__progress-bar {
	display: block;
	height: 100%;
	width: 0;
	border-radius: 999em;
	background: var(--ch-green);
	transition: width 0.3s ease;
}

.course-quiz__qhead {
	margin-bottom: 0.75em;
}

.course-quiz__qnum {
	font-size: 0.8125em;
	font-weight: 600;
	letter-spacing: 0.02em;
	color: var(--ch-muted);
}

.course-quiz__qtext {
	margin: 0 0 1em;
	font-weight: 600;
	font-size: 1.125em;
	line-height: 1.4;
	color: var(--ch-ink);
}

.course-quiz__options {
	display: flex;
	flex-direction: column;
	gap: 0.625em;
}

.course-quiz__option-body {
	display: flex;
	flex-direction: column;
	gap: 0.375em;
	flex: 1;
	min-width: 0;
}

.course-quiz__option {
	display: flex;
	align-items: flex-start;
	gap: 0.75em;
	width: 100%;
	padding: 0.875em 1em;
	border: 1px solid var(--ch-line);
	border-radius: 0.625em;
	background: #fff;
	color: var(--ch-ink);
	font: inherit;
	font-size: 0.9375em;
	line-height: 1.5;
	text-align: left;
	cursor: pointer;
	transition: border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.course-quiz__option:focus-visible {
	outline: 2px solid var(--ch-green);
	outline-offset: 2px;
}

.course-quiz__option:disabled {
	cursor: default;
}

.course-quiz__option-mark {
	position: relative;
	flex: none;
	width: 1.5em;
	height: 1.5em;
	margin-top: 0.0625em;
	border: 1px solid #A7A7A8;
	border-radius: 50%;
	background: #fff;
	transition: border-color 0.2s ease, background-color 0.2s ease;
}

.course-quiz__option-text {
	line-height: 1.5;
}

@media (hover: hover) and (pointer: fine) {
	.course-quiz__option:hover:not(:disabled):not(.is-correct):not(.is-wrong) {
		border-color: var(--ch-green);
		box-shadow: 0 0 0 1px var(--ch-green);
	}
}

.course-quiz__option.is-correct {
	border-color: var(--ch-green);
	background: var(--ch-soft);
}

.course-quiz__option.is-correct .course-quiz__option-mark {
	border-color: var(--ch-green);
	background: var(--ch-green);
}

.course-quiz__option.is-correct .course-quiz__option-mark::after {
	content: "";
	position: absolute;
	left: 50%;
	top: 50%;
	width: 0.5625em;
	height: 0.3125em;
	border-left: 2px solid #fff;
	border-bottom: 2px solid #fff;
	transform: translate(-50%, -62%) rotate(-45deg);
}

.course-quiz__option.is-wrong {
	border-color: var(--ch-warn-line);
	background: var(--ch-warn);
}

.course-quiz__option.is-wrong .course-quiz__option-mark {
	border-color: var(--ch-warn-line);
	background: var(--ch-warn-line);
}

.course-quiz__option.is-wrong .course-quiz__option-mark::before,
.course-quiz__option.is-wrong .course-quiz__option-mark::after {
	content: "";
	position: absolute;
	left: 50%;
	top: 50%;
	width: 0.75em;
	height: 2px;
	border-radius: 2px;
	background: #fff;
}

.course-quiz__option.is-wrong .course-quiz__option-mark::before {
	transform: translate(-50%, -50%) rotate(45deg);
}

.course-quiz__option.is-wrong .course-quiz__option-mark::after {
	transform: translate(-50%, -50%) rotate(-45deg);
}

.course-quiz__comment {
	font-size: 0.8125em;
	line-height: 1.45;
	font-style: italic;
	color: var(--ch-muted);
}

.course-quiz__comment[hidden] {
	display: none;
}

.course-quiz__nav {
	margin-top: 1.25em;
	display: flex;
	align-items: center;
}

.course-quiz__next {
	display: inline-flex;
	align-items: center;
	gap: 0.5em;
	padding: 0.875em 1.5em;
	border: none;
	border-radius: 0.625em;
	background: var(--ch-green);
	color: #fff;
	font: inherit;
	font-weight: 600;
	font-size: 0.9375em;
	line-height: 1.4;
	cursor: pointer;
	transition: background-color 0.2s ease;
}

.course-quiz__next:focus-visible {
	outline: 2px solid var(--ch-green);
	outline-offset: 2px;
}

@media (hover: hover) and (pointer: fine) {
	.course-quiz__next:hover {
		background: var(--ch-green-dark);
	}
}

.course-quiz__next[hidden] {
	display: none;
}

.course-quiz__result {
	margin-top: 1em;
	padding: 1.75em 1.5em;
	border-radius: 0.75em;
	text-align: center;
}

.course-quiz__result[hidden] {
	display: none;
}

.course-quiz__result.is-success {
	background: var(--ch-soft);
	border: 1px solid #03A87D;
}

.course-quiz__result.is-fail {
	background: var(--ch-warn);
	border: 1px solid #DC3546;
}

.course-quiz__result-score {
	display: flex;
	align-items: baseline;
	justify-content: center;
	gap: 0.4em;
	font-weight: 700;
}

.course-quiz__result-correct {
	font-size: 2.5em;
	line-height: 1;
}

.course-quiz__result.is-success .course-quiz__result-correct {
	color: var(--ch-green);
}

.course-quiz__result.is-fail .course-quiz__result-correct {
	color: var(--ch-warn-line);
}

.course-quiz__result-sep,
.course-quiz__result-total {
	font-size: 1.125em;
	color: var(--ch-muted);
}

.course-quiz__result-text {
	margin: 0.5em 0 0;
	font-weight: 600;
	line-height: 1.5;
}

.course-quiz__result-actions {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	gap: 0.75em;
	margin-top: 1.25em;
}

.course-quiz__retry {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	margin: 0;
	padding: 0.75em 1.5em;
	border: 1px solid var(--ch-warn-line);
	border-radius: 0.625em;
	background: #fff;
	color: var(--ch-warn-line);
	font: inherit;
	font-weight: 600;
	font-size: 0.9375em;
	line-height: 1.4;
	cursor: pointer;
	transition: background-color 0.2s ease, color 0.2s ease;
}

@media (hover: hover) and (pointer: fine) {
	.course-quiz__retry:hover {
		background: var(--ch-warn-line);
		color: #fff;
	}
}

.course-quiz__retry[hidden] {
	display: none;
}

.course-quiz__continue {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	margin: 0;
	padding: 0.75em 1.5em;
	border: 1px solid var(--ch-green);
	border-radius: 0.625em;
	background: var(--ch-green);
	color: #fff;
	font: inherit;
	font-weight: 600;
	font-size: 0.9375em;
	line-height: 1.4;
	cursor: pointer;
	transition: background-color 0.2s ease, border-color 0.2s ease;
}

@media (hover: hover) and (pointer: fine) {
	.course-quiz__continue:hover {
		background: var(--ch-green-dark);
		border-color: var(--ch-green-dark);
	}
}

.course-quiz__continue[hidden] {
	display: none;
}

@media (max-width: 48em) {
	.course-quiz__next {
		width: 100%;
		justify-content: center;
	}

	.course-quiz__result-actions {
		flex-direction: column;
	}

	.course-quiz__retry,
	.course-quiz__continue {
		width: 100%;
	}
}

.course-finish {
	margin-top: 1.5em;
}

.course-finish[hidden] {
	display: none;
}

/* ---------- Пагинация ---------- */

.course-pager {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 1em;
	margin-top: 2.5em;
	padding-top: 1.5em;
	border-top: 1px solid var(--ch-line);
}

.course-pager__spacer {
	flex: 1;
}

.course-pager a {
	display: inline-block;
	padding: 0.75em 1.25em;
	border-radius: 0.625em;
	text-decoration: none;
	font-weight: 600;
	transition: background-color 0.2s ease, color 0.2s ease;
}

.course-pager__prev {
	color: var(--ch-ink);
	border: 1px solid var(--ch-line);
}

.course-pager__prev:hover {
	border-color: var(--ch-green);
	color: var(--ch-green);
}

.course-pager__next {
	margin-left: auto;
	background: var(--ch-green);
	color: #fff;
}

.course-pager__next:hover {
	background: var(--ch-green-dark);
	color: #fff;
}

/* ---------- Архив (хаб) ---------- */

.course-archive__subtitle {
	max-width: 40em;
	margin: 0 0 2em;
	color: var(--ch-muted);
	font-size: 1.125em;
	line-height: 1.5;
}

.course-archive__grid {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 1.875em;
}

.course-card {
	display: flex;
	flex-direction: column;
	align-items: flex-start;
	gap: 0.75em;
	padding: 1.5em;
	border: 1px solid var(--ch-line);
	border-radius: 0.625em;
	transition: border-color 0.2s ease;
}

.course-card:hover {
	border-color: var(--ch-green);
}

.course-card__badge {
	padding: 0.286em 0.714em;
	border-radius: 0.286em;
	font-size: 0.75em;
	line-height: 1.4;
	color: #fff;
	background: var(--ch-green);
}

.course-card__title {
	margin: 0;
	font-size: 1.25em;
	line-height: 1.3;
}

.course-card__title a {
	color: var(--ch-ink);
	text-decoration: none;
}

.course-card__title a:hover {
	color: var(--ch-green);
}

.course-card__text {
	margin: 0;
	font-size: 0.9375em;
	line-height: 1.5;
	color: var(--ch-muted);
}

.course-card__btn {
	margin-top: auto;
}

/* ---------- Адаптивность ---------- */

@media (max-width: 64em) {
	.course__layout {
		grid-template-columns: 240px minmax(0, 1fr);
		gap: 2.5em;
	}
}

@media (max-width: 48em) {
	.course__layout {
		grid-template-columns: 1fr;
	}

	/* Сайдбар превращается в выезжающее оглавление. */
	.course-side {
		position: fixed;
		top: 0;
		left: 0;
		z-index: 100;
		width: 85%;
		max-width: 320px;
		height: 100vh;
		padding: 1.25em;
		background: #fff;
		box-shadow: 0 0 40px rgba(30, 30, 30, 0.18);
		overflow-y: auto;
		transform: translateX(-105%);
		transition: transform 0.25s ease;
	}

	.course.is-toc-open .course-side {
		transform: translateX(0);
	}

	.course-side__inner {
		padding-bottom: 2em;
	}

	/* Кнопка оглавления — всегда на экране. */
	.course-side__toggle {
		display: grid;
		place-items: center;
		position: fixed;
		right: 0.875em;
		bottom: 1em;
		z-index: 110;
		width: 3.25em;
		height: 3.25em;
		border: none;
		border-radius: 50%;
		color: #fff;
		background: var(--ch-green);
		box-shadow: 0 8px 24px rgba(1, 169, 125, 0.4);
	}

	.course-side__toggle:active {
		background: var(--ch-green-dark);
	}

	.course--task .course-side__toggle {
		display: grid;
		place-items: center;
		position: fixed;
		right: 0.875em;
		bottom: 1em;
		z-index: 110;
		width: 3.25em;
		height: 3.25em;
		border: none;
		border-radius: 50%;
		color: #fff;
		background: var(--ch-green);
		box-shadow: 0 8px 24px rgba(1, 169, 125, 0.4);
	}

	.course--task .course-side__toggle:active {
		background: var(--ch-green-dark);
	}

	/* Подложка под оглавлением. */
	.course-side__overlay {
		display: block;
		position: fixed;
		inset: 0;
		z-index: 99;
		background: rgba(30, 30, 30, 0.5);
		opacity: 0;
		visibility: hidden;
		transition: opacity 0.25s ease, visibility 0.25s ease;
	}

	.course.is-toc-open .course-side__overlay {
		opacity: 1;
		visibility: visible;
	}

	.course-toc-locked {
		overflow: hidden;
	}

	.course-hero__title {
		font-size: 1.5em;
	}

	.course-next {
		width: 100%;
		justify-content: center;
	}

	.course-block {
		padding: 1.125em 1em;
		margin: 1.375em 0;
	}

	.course-pager {
		flex-wrap: wrap;
	}

	.course-pager a {
		font-size: 0.875em;
	}

	.course-pager__next {
		margin-left: auto;
	}

	.course-archive__grid {
		grid-template-columns: 1fr;
		gap: 1.25em;
	}
}

/* ---------- Задача (code) внутри курса ---------- */

/* Оглавление свёрнуто на любой ширине экрана (как на мобильных). */
.course--task .course__layout {
	grid-template-columns: 1fr;
}

.course--task .course-side {
	position: fixed;
	top: 0;
	left: 0;
	z-index: 100;
	width: 85%;
	max-width: 320px;
	height: 100vh;
	padding: 1.25em;
	background: #fff;
	box-shadow: 0 0 40px rgba(30, 30, 30, 0.18);
	overflow-y: auto;
	transform: translateX(-105%);
	transition: transform 0.25s ease;
}

.course--task.is-toc-open .course-side {
	transform: translateX(0);
}

.course--task .course-side__inner {
	padding-bottom: 2em;
}

.course--task .course-side__toggle {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	position: static;
	width: 2.75em;
	height: 2.75em;
	margin: 0 0 1.125em;
	padding: 0;
	border: 1px solid var(--ch-line);
	border-radius: 0.625em;
	color: var(--ch-ink);
	background: #fff;
	box-shadow: none;
	cursor: pointer;
	transition: border-color 0.2s ease, color 0.2s ease;
}

.course--task .course-side__toggle:hover {
	border-color: var(--ch-green);
	color: var(--ch-green);
}

.course-hero__head {
	display: flex;
	align-items: center;
	gap: 0.75em;
}

.course-hero__head .course-side__toggle {
	margin: 0;
	flex: none;
}

.course--task .course-side__overlay {
	display: block;
	position: fixed;
	inset: 0;
	z-index: 99;
	background: rgba(30, 30, 30, 0.5);
	opacity: 0;
	visibility: hidden;
	transition: opacity 0.25s ease, visibility 0.25s ease;
}

.course--task.is-toc-open .course-side__overlay {
	opacity: 1;
	visibility: visible;
}

/* Пункт-задача в оглавлении. */
.course-side__nav li.is-task a > span:first-child {
	font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
	font-size: 0.68em;
	letter-spacing: -0.03em;
	color: var(--ch-green);
}

/* Редактор задачи. */
.course-task-editor {
	margin-top: 1.5em;
}

.course-task-solution {
	margin-top: 1.5em;
	padding: 1em 1.25em;
	border: 1px solid var(--ch-line);
	border-radius: 0.625em;
}

.course-task-solution summary {
	cursor: pointer;
	font-weight: 600;
	color: var(--ch-green);
}

.course-task-solution .solution-block {
	margin-top: 1em;
}

/* Отметка «на вычитке». */
.course-review {
	margin-bottom: 1.25em;
	padding: 0.5em 0.875em;
	font-size: 0.8125em;
	line-height: 1.5;
	color: var(--ch-muted);
	background: var(--ch-soft);
	border: 1px solid var(--ch-line);
	border-radius: 0.5em;
}