.kosour-staircase-page {
	--kosour-ink: #142b22;
	--kosour-muted: #667a71;
	--kosour-brand: #087b57;
	--kosour-brand-dark: #07533d;
	--kosour-line: #d8e8e0;
	--kosour-panel: #ffffff;
	--kosour-soft: #eff8f3;
}

.kosour-calculator {
	display: grid;
	gap: 32px;
}

.kosour-calculator h2,
.kosour-calculator h3,
.kosour-calculator p {
	margin-top: 0;
}

.kosour-diagrams {
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: 24px;
}

.kosour-diagram-card,
.kosour-form,
.kosour-result,
.kosour-drawing,
.kosour-content {
	margin: 0;
	padding: 24px;
	border: 1px solid var(--kosour-line);
	border-radius: 24px;
	background: var(--kosour-panel);
	box-shadow: 0 18px 40px rgba(20, 43, 34, 0.06);
}

.kosour-diagram-card {
	display: grid;
	gap: 16px;
}

.kosour-diagram-card img {
	display: block;
	width: 100%;
	height: auto;
	border: 1px solid var(--kosour-line);
	border-radius: 16px;
	background: #f9fcfa;
}

.kosour-diagram-card figcaption,
.kosour-drawing__caption {
	margin: 0;
	color: var(--kosour-muted);
	font-size: 0.98rem;
}

.kosour-workspace {
	display: grid;
	grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.95fr);
	gap: 24px;
	align-items: start;
}

.kosour-form,
.kosour-result {
	display: grid;
	gap: 24px;
}

.kosour-form__heading h2,
.kosour-result__heading h2,
.kosour-drawing__header h2,
.kosour-actions h2,
.kosour-content h2 {
	margin-bottom: 10px;
	color: var(--kosour-ink);
	font-size: clamp(1.55rem, 2.5vw, 2.25rem);
	line-height: 1.08;
}

.kosour-form__heading p:not(.kosour-form__eyebrow),
.kosour-result__heading p:not(.kosour-result__eyebrow),
.kosour-drawing__header > p,
.kosour-actions__intro > p:not(.kosour-actions__eyebrow),
.kosour-content p {
	margin-bottom: 0;
	color: var(--kosour-muted);
}

.kosour-form__eyebrow,
.kosour-result__eyebrow,
.kosour-drawing__eyebrow,
.kosour-actions__eyebrow,
.kosour-content__eyebrow {
	margin-bottom: 8px;
	color: var(--kosour-brand);
	font-size: 0.78rem;
	font-weight: 800;
	letter-spacing: 0.12em;
	text-transform: uppercase;
}

.kosour-form__group {
	margin: 0;
	padding: 0;
	border: 0;
}

.kosour-form__group + .kosour-form__group {
	padding-top: 24px;
	border-top: 1px solid var(--kosour-line);
}

.kosour-form__group legend {
	margin-bottom: 16px;
	padding: 0;
	color: var(--kosour-ink);
	font-size: 1.1rem;
	font-weight: 800;
}

.kosour-form__grid {
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: 16px;
}

.kosour-calculator .field {
	display: grid;
	gap: 7px;
	color: #365148;
	font-size: 0.92rem;
	font-weight: 700;
}

.kosour-calculator .field input,
.kosour-calculator .field select,
.kosour-actions__download select {
	width: 100%;
	min-height: 48px;
	padding: 10px 12px;
	border: 1px solid #b9d4c7;
	border-radius: 12px;
	outline: none;
	color: var(--kosour-ink);
	background: #fff;
	font: inherit;
	font-weight: 500;
	transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.kosour-calculator .field input:focus,
.kosour-calculator .field select:focus,
.kosour-actions__download select:focus {
	border-color: var(--kosour-brand);
	box-shadow: 0 0 0 4px rgba(8, 123, 87, 0.12);
}

.kosour-calculator .check-field {
	display: flex;
	gap: 12px;
	align-items: flex-start;
	margin-top: 16px;
	padding: 14px 16px;
	border: 1px solid var(--kosour-line);
	border-radius: 14px;
	background: #fbfdfc;
	cursor: pointer;
}

.kosour-calculator .check-field input {
	width: 18px;
	height: 18px;
	margin: 2px 0 0;
	accent-color: var(--kosour-brand);
}

.kosour-calculator .check-field strong,
.kosour-calculator .check-field small {
	display: block;
}

.kosour-calculator .check-field strong {
	color: var(--kosour-ink);
}

.kosour-calculator .check-field small {
	margin-top: 2px;
	color: var(--kosour-muted);
}

.kosour-form__submit {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 100%;
	min-height: 56px;
	padding: 14px 24px;
	margin-top: 0;
	border: 0;
	border-radius: 12px;
	color: #fff;
	background: linear-gradient(135deg, #19a874, #08724e);
	box-shadow: 0 10px 22px rgb(8 114 78 / 23%);
	font: inherit;
	font-size: 1rem;
	font-weight: 800;
	line-height: 1.2;
	cursor: pointer;
	transition: box-shadow .15s ease, transform .15s ease, background-color .15s ease;
}

.kosour-form__submit:hover,
.kosour-form__submit:focus-visible {
	color: #fff;
	background: linear-gradient(135deg, #1db47d, #08724e);
	box-shadow: 0 14px 28px rgb(8 114 78 / 30%);
	transform: translateY(-2px);
}

.kosour-form__submit:focus-visible {
	outline: 3px solid rgba(25, 168, 116, .3);
	outline-offset: 3px;
}

.kosour-form__submit:active {
	transform: translateY(0);
}

.kosour-result {
	position: sticky;
	top: 24px;
}

.kosour-notice {
	min-height: 3em;
}

.kosour-result__metrics {
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: 12px;
}

.kosour-result .metric {
	padding: 16px;
	border-radius: 16px;
	background: var(--kosour-soft);
}

.kosour-result .metric span,
.spec-list dt {
	display: block;
	color: var(--kosour-muted);
	font-size: 0.87rem;
}

.kosour-result .metric strong {
	display: block;
	margin-top: 4px;
	color: var(--kosour-brand-dark);
	font-size: 1.15rem;
}

.kosour-result__section {
	padding-top: 20px;
	border-top: 1px solid var(--kosour-line);
}

.kosour-result__section h3 {
	margin-bottom: 12px;
	color: var(--kosour-ink);
	font-size: 1.1rem;
}

.spec-list {
	margin: 0;
}

.spec-list > div {
	display: flex;
	justify-content: space-between;
	gap: 16px;
	padding: 12px 0;
	border-bottom: 1px solid #e7f0eb;
}

.spec-list dd {
	margin: 0;
	color: var(--kosour-ink);
	font-weight: 800;
	text-align: right;
}

.kosour-result__recommendation {
	padding: 14px 16px;
	border-radius: 14px;
	color: #345a4d;
	background: #f1f8e8;
	font-size: 0.94rem;
}

.kosour-result__recommendation.is-warning {
	color: #75470e;
	background: #fff3d9;
}

.kosour-drawing {
	display: grid;
	gap: 22px;
}

.kosour-drawing__header,
.kosour-actions {
	display: grid;
	grid-template-columns: minmax(0, 1fr) minmax(260px, 0.85fr);
	gap: 24px;
	align-items: start;
}

.kosour-drawing__canvas {
	overflow: hidden;
	border: 1px solid var(--kosour-line);
	border-radius: 18px;
	background: #fbfdfc;
}

.kosour-drawing__canvas svg {
	display: block;
	width: 100%;
	height: auto;
}

.kosour-actions {
	padding: 36px;
	border-radius: 28px;
	color: #fff;
	background: #102f24;
	box-shadow: 0 20px 44px rgba(10, 47, 36, 0.14);
}

.kosour-actions h2 {
	color: #fff;
}

.kosour-actions__intro > p:not(.kosour-actions__eyebrow) {
	color: #c3d8cf;
}

.kosour-actions__eyebrow {
	color: #69d8b1;
}

.kosour-actions__controls {
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: 12px;
}

.kosour-actions .button {
	min-height: 54px;
	padding: 12px 16px;
	border-radius: 14px;
	font-size: 1rem;
	font-weight: 800;
}

.kosour-actions .button--accent {
	border-color: #0fa476;
	background: #0fa476;
	color: #fff;
}

.kosour-actions .button--secondary {
	border: 1px solid rgba(235, 255, 246, 0.32);
	background: rgba(255, 255, 255, 0.07);
	color: #fff;
}

.kosour-actions__download {
	display: grid;
	grid-column: 1 / -1;
	gap: 6px;
	color: #d7ece4;
	font-size: 0.88rem;
	font-weight: 800;
}

.kosour-actions__download select {
	color: var(--kosour-ink);
}

.kosour-actions__copy {
	grid-column: 1 / -1;
}

.kosour-content {
	display: grid;
	gap: 22px;
}

.kosour-content__grid {
	display: grid;
	grid-template-columns: minmax(0, 1.2fr) minmax(240px, 0.8fr);
	gap: 24px;
}

.kosour-content__grid p + p {
	margin-top: 16px;
}

.kosour-content__note {
	padding: 20px;
	border-radius: 18px;
	background: var(--kosour-soft);
}

.kosour-content__note h3 {
	margin-bottom: 10px;
	color: var(--kosour-brand-dark);
}

.kosour-content__note ul {
	margin: 0;
	padding-left: 20px;
	color: #486259;
}

.kosour-content__note li + li {
	margin-top: 8px;
}

.kosour-guide {
	display: grid;
	gap: 16px;
	padding-top: 24px;
	border-top: 1px solid var(--kosour-line);
}

.kosour-guide h2 {
	margin: 0;
	font-size: clamp(1.35rem, 2vw, 1.8rem);
}

.kosour-table-wrap {
	overflow-x: auto;
	border: 1px solid var(--kosour-line);
	border-radius: 18px;
	background: #fff;
}

.kosour-comparison {
	width: 100%;
	min-width: 680px;
	border-collapse: collapse;
}

.kosour-comparison th,
.kosour-comparison td {
	padding: 16px 18px;
	border-bottom: 1px solid var(--kosour-line);
	text-align: left;
	vertical-align: top;
}

.kosour-comparison thead th {
	color: var(--kosour-brand-dark);
	background: var(--kosour-soft);
	font-size: 0.9rem;
}

.kosour-comparison tbody th {
	width: 24%;
	color: var(--kosour-ink);
	font-weight: 800;
}

.kosour-comparison tbody tr:last-child th,
.kosour-comparison tbody tr:last-child td {
	border-bottom: 0;
}

.kosour-tips {
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	gap: 14px;
}

.kosour-tips article {
	padding: 20px;
	border: 1px solid var(--kosour-line);
	border-radius: 18px;
	background: #fff;
}

.kosour-tips h3 {
	margin: 0 0 10px;
	color: var(--kosour-brand-dark);
	font-size: 1.05rem;
}

.kosour-tips p {
	margin: 0;
}

.kosour-faq {
	padding-top: 24px;
	border-top: 1px solid var(--kosour-line);
}

.kosour-faq h2 {
	margin-bottom: 14px;
	font-size: clamp(1.35rem, 2vw, 1.8rem);
}

.kosour-faq details {
	padding: 16px 0;
	border-bottom: 1px solid var(--kosour-line);
}

.kosour-faq summary {
	color: var(--kosour-ink);
	font-weight: 800;
	cursor: pointer;
}

.kosour-faq p {
	margin: 12px 0 0;
}

@media (max-width: 860px) {
	.kosour-workspace,
	.kosour-drawing__header,
	.kosour-actions,
	.kosour-content__grid,
	.kosour-tips {
		grid-template-columns: 1fr;
	}

	.kosour-result {
		position: static;
	}
}

@media (max-width: 620px) {
	.kosour-calculator {
		gap: 20px;
	}

	.kosour-diagrams,
	.kosour-form__grid,
	.kosour-result__metrics,
	.kosour-actions__controls {
		grid-template-columns: 1fr;
	}

	.kosour-diagram-card,
	.kosour-form,
	.kosour-result,
	.kosour-drawing,
	.kosour-content {
		padding: 18px;
		border-radius: 20px;
	}

	.kosour-actions {
		padding: 24px;
		border-radius: 22px;
	}

	.kosour-actions__download,
	.kosour-actions__copy {
		grid-column: auto;
	}

	.spec-list > div {
		display: grid;
		gap: 4px;
	}

	.spec-list dd {
		text-align: left;
	}
}