.sda-module-main {
	min-height: calc(100vh - 76px);
	padding: 24px 0 64px;
	background:
		radial-gradient(circle at 100% 0, rgba(245, 194, 113, 0.2), transparent 30%),
		linear-gradient(180deg, #f7f8f5 0%, #eef4f0 100%);
}

.sda-module-container {
	max-width: 860px;
}

.sda-module-help {
	min-height: 44px;
	padding: 10px 14px;
	border: 1px solid rgba(22, 59, 50, 0.18);
	border-radius: 999px;
	color: var(--sda-evergreen-900);
	font-size: 14px;
	font-weight: 750;
	text-decoration: none;
	transition: background-color 160ms ease, border-color 160ms ease;
}

.sda-module-help:hover {
	border-color: var(--sda-evergreen-700);
	background: var(--sda-paper);
}

.sda-module-breadcrumb {
	display: flex;
	flex-wrap: wrap;
	gap: 8px;
	margin-bottom: 24px;
	color: var(--sda-stone-600);
	font-size: 14px;
}

.sda-module-breadcrumb a {
	color: var(--sda-evergreen-700);
	font-weight: 700;
}

.sda-module-progress {
	max-width: 760px;
	margin: 0 auto 18px;
}

.sda-module-progress__labels {
	display: flex;
	justify-content: space-between;
	gap: 16px;
	color: var(--sda-stone-600);
	font-size: 13px;
	font-weight: 700;
}

.sda-module-progress .sda-progress {
	height: 8px;
	margin-top: 9px;
}

.sda-lesson-card {
	position: relative;
	max-width: 760px;
	min-height: 540px;
	margin-inline: auto;
	padding: 30px 22px 24px;
	overflow: hidden;
	border: 1px solid rgba(22, 59, 50, 0.1);
	border-radius: var(--sda-radius-large);
	background: var(--sda-paper);
	box-shadow: var(--sda-shadow);
}

.sda-lesson-card::before {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 5px;
	background: linear-gradient(90deg, var(--sda-evergreen-700), var(--sda-dash-orange));
	content: "";
}

.sda-lesson-heading {
	max-width: 680px;
}

.sda-lesson-card h1 {
	max-width: 720px;
	margin: 0;
	color: var(--sda-evergreen-900);
	font-family: var(--sda-serif);
	font-size: clamp(38px, 10vw, 56px);
	font-weight: 500;
	letter-spacing: -0.045em;
	line-height: 1.02;
}

.sda-lesson-lede {
	max-width: 680px;
	margin: 22px 0 0;
	color: var(--sda-stone-700);
	font-size: clamp(19px, 5vw, 23px);
	line-height: 1.48;
}

.sda-lesson-body {
	max-width: 680px;
	margin-top: 28px;
	color: var(--sda-stone-700);
	font-size: 18px;
}

.sda-lesson-body p {
	margin: 0 0 18px;
}

.sda-takeaway {
	max-width: 680px;
	margin-top: 30px;
	padding: 22px;
	border: 1px solid rgba(22, 59, 50, 0.1);
	border-left: 5px solid var(--sda-dash-orange);
	border-radius: 0 var(--sda-radius-medium) var(--sda-radius-medium) 0;
	background: linear-gradient(135deg, #fff8ed 0%, #fffdf8 100%);
}

.sda-takeaway strong {
	color: var(--sda-evergreen-900);
}

.sda-takeaway p {
	margin: 6px 0 0;
	color: var(--sda-stone-700);
}

.sda-knowledge-check {
	margin-top: 30px;
}

.sda-knowledge-check fieldset {
	display: grid;
	gap: 12px;
	margin: 0 0 24px;
	padding: 0;
	border: 0;
}

.sda-knowledge-check label {
	display: flex;
	align-items: flex-start;
	min-height: 58px;
	gap: 12px;
	padding: 16px;
	border: 1px solid var(--sda-stone-300);
	border-radius: 14px;
	color: var(--sda-stone-700);
	cursor: pointer;
	transition: background-color 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.sda-knowledge-check label:hover {
	border-color: var(--sda-evergreen-500);
	transform: translateY(-1px);
}

.sda-knowledge-check label:has(input:checked) {
	border-color: var(--sda-evergreen-700);
	background: var(--sda-evergreen-100);
	color: var(--sda-evergreen-900);
}

.sda-knowledge-check input {
	width: 20px;
	height: 20px;
	margin: 2px 0 0;
	accent-color: var(--sda-evergreen-700);
}

.sda-feedback {
	margin-top: 24px;
	padding: 20px;
	border-radius: var(--sda-radius-medium);
}

.sda-feedback--correct {
	border: 1px solid #8bb8a5;
	background: #eef7f3;
}

.sda-feedback--review {
	border: 1px solid #e4ba7a;
	background: #fff8ed;
}

.sda-feedback h2 {
	margin: 0;
	color: var(--sda-evergreen-900);
	font-size: 22px;
}

.sda-feedback p {
	margin: 8px 0 0;
	color: var(--sda-stone-700);
}

.sda-module-chelsea {
	display: grid;
	gap: 20px;
	margin-top: 34px;
	padding: 24px;
	border-radius: var(--sda-radius-medium);
	border: 1px solid rgba(22, 59, 50, 0.1);
	background: linear-gradient(145deg, var(--sda-evergreen-100), #f1f7f4);
}

.sda-module-chelsea h2 {
	margin: 0;
	color: var(--sda-evergreen-900);
	font-family: var(--sda-serif);
	font-size: 30px;
	font-weight: 500;
}

.sda-module-chelsea blockquote {
	margin: 14px 0 0;
}

.sda-module-chelsea blockquote p {
	margin: 0;
	color: var(--sda-stone-700);
	font-family: var(--sda-serif);
	font-size: 20px;
	line-height: 1.5;
}

.sda-module-chelsea cite {
	display: block;
	margin-top: 12px;
	color: var(--sda-evergreen-800);
	font-size: 14px;
	font-style: normal;
	font-weight: 750;
}

.sda-lesson-actions {
	display: flex;
	flex-wrap: wrap;
	justify-content: space-between;
	gap: 12px;
	margin-top: 36px;
	padding-top: 24px;
	border-top: 1px solid rgba(22, 59, 50, 0.1);
}

.sda-preview-note {
	max-width: 760px;
	margin: 16px auto 0;
	color: var(--sda-stone-600);
	font-size: 13px;
	text-align: center;
}

@media (min-width: 600px) {
	.sda-module-main {
		padding: 42px 0 90px;
	}

	.sda-lesson-card {
		min-height: 580px;
		padding: 50px 48px 32px;
	}

	.sda-module-chelsea {
		grid-template-columns: auto 1fr;
		padding: 28px;
	}
}

@media (max-width: 479px) {
	.sda-module-progress__labels {
		align-items: flex-start;
		flex-direction: column;
		gap: 2px;
	}

	.sda-lesson-actions,
	.sda-lesson-actions .sda-button {
		width: 100%;
	}

	.sda-knowledge-check .sda-button {
		width: 100%;
	}
}

@media (forced-colors: active) {
	.sda-lesson-card,
	.sda-module-help,
	.sda-knowledge-check label,
	.sda-feedback,
	.sda-takeaway {
		border: 1px solid CanvasText;
	}
}

@media (prefers-reduced-motion: reduce) {
	.sda-module-help,
	.sda-knowledge-check label {
		transition: none;
	}
}