/**
 * Signal OS section.
 *
 * @package Fundamento
 */

.signal-os-scroll-container {
	/* Signal OS dark bg — no design token available */
	--signal-os-bg: #2a2a26;

	position: relative;
	isolation: isolate;
	width: 100%;
	margin-left: 0;
	margin-right: 0;
	background-color: var(--signal-os-bg);
}

.signal-os-sticky-wrapper {
	/* Vars live here so pinReparent keeps them in scope */
	--signal-os-bg: #2a2a26;
	--signal-os-legend-width: 15.9375rem;
	--signal-os-list-width: 25.9375rem;
	--signal-os-left-gap: 5rem;
	--signal-os-list-gap: 4.875rem;

	width: 100%;
	background-color: var(--signal-os-bg);
}

.signal-os-sticky-wrapper.is-pinned {
	position: fixed !important;
	top: 0;
	right: 0;
	left: 0 !important;
	z-index: 100;
	width: 100% !important;
	max-width: 100vw;
	margin: 0;
}

.signal-os {
	position: relative;
	width: 100%;
	overflow: clip;
	background-color: var(--signal-os-bg);
}

.signal-os__texture {
	position: absolute;
	inset: 0;
	z-index: 0;
	pointer-events: none;
	opacity: 0.15;
	/* TODO: Add grain texture image asset */
	background-image: none;
}

.signal-os__pattern {
	position: absolute;
	top: 0;
	left: 0;
	z-index: 0;
	width: min(35rem, 45vw);
	pointer-events: none;
	opacity: 0.4;
}

.signal-os__pattern-image {
	display: block;
	width: 100%;
	height: auto;
}

.signal-os__container {
	position: relative;
	z-index: 1;
	display: grid;
	grid-template-columns: minmax(0, 1fr) var(--signal-os-list-width);
	gap: var(--space-20);
	width: 100%;
	max-width: none;
	margin: 0;
	padding: var(--space-80) var(--space-40);
	box-sizing: border-box;
}

.signal-os__left {
	display: grid;
	grid-template-columns: var(--signal-os-legend-width) minmax(0, 1fr);
	gap: var(--signal-os-left-gap);
	align-items: end;
	min-width: 0;
}

.signal-os__legend {
	display: flex;
	flex-direction: column;
	gap: var(--space-8);
	align-self: end;
	width: var(--signal-os-legend-width);
	flex-shrink: 0;
}

.signal-os__content {
	display: flex;
	flex-direction: column;
	gap: var(--space-16);
	min-width: 0;
	height: fit-content;
}

.signal-os__heading {
	margin: 0;
	font-family: var(--font-family-display);
	font-size: var(--text-display-h1-alt-size);
	font-weight: 400;
	line-height: 1.1;
	letter-spacing: 0;
	color: var(--color-text-inverse);
	max-width: 26rem;
}

.signal-os__heading sup {
	font-size: 0.45em;
	line-height: 0;
	vertical-align: super;
}

.signal-os__description {
	max-width: 28.25rem;
	margin: 0;
	font-family: var(--font-family-body);
	font-size: var(--text-body-md-size);
	font-weight: 400;
	line-height: 1.4;
	color: var(--color-text-inverse);
}

.signal-os__cta {
	display: inline-flex;
	align-items: center;
	gap: var(--space-8);
	width: fit-content;
	padding: 12px var(--space-20);
	font-family: var(--font-family-body);
	font-size: var(--text-body-sm-size);
	font-weight: 400;
	line-height: var(--text-body-sm-lh);
	color: var(--color-text-brand);
	text-decoration: none;
	background: var(--color-blue-50);
	border: 1px solid color-mix(in srgb, var(--color-text-inverse) 35%, transparent);
	transition: background-color 0.2s ease;
}

.signal-os__cta:hover {
	background-color: color-mix(in srgb, var(--color-text-inverse) 10%, transparent);
	color: var(--color-text-inverse);
	text-decoration: none;
}

.signal-os__legend-item {
	display: flex;
	align-items: center;
	gap: var(--space-8);
	font-family: var(--font-family-body);
	font-size:16px;
	font-weight: 400;
	line-height: var(--text-body-sm-lh);
}

.signal-os__legend-dash {
	flex-shrink: 0;
	width: var(--space-16);
	height: 1px;
}

.signal-os__legend-item--high {
	color: color-mix(in srgb, var(--color-text-inverse) 60%, transparent);
}

.signal-os__legend-item--high .signal-os__legend-dash {
	background-color: color-mix(in srgb, var(--color-text-inverse) 60%, transparent);
}

.signal-os__legend-item--low {
	color: color-mix(in srgb, var(--color-text-inverse) 30%, transparent);
}

.signal-os__legend-item--low .signal-os__legend-dash {
	background-color: color-mix(in srgb, var(--color-text-inverse) 30%, transparent);
}

.signal-os__list {
	position: relative;
	display: flex;
	flex-direction: column;
	gap: 0;
	flex-shrink: 0;
	width: var(--signal-os-list-width);
	padding: 0;
}

.signal-os__list::before {
	content: '';
	position: absolute;
	top: 0;
	bottom: 0;
	left: 17px;
	z-index: 0;
	width: 1px;
	background: linear-gradient(to bottom, #948361 100%, #ffffff 0%);
}

.signal-list__item {
	position: relative;
	z-index: 1;
	display: flex;
	align-items: center;
	gap: var(--space-40);
	padding: 0;
	font-family: var(--font-family-body);
	font-size: 1.25rem;
	font-weight: 400;
	line-height: 1.4;
	color: var(--color-text-inverse);
	cursor: default;
	transition:
		color 0.4s ease,
		font-weight 0.3s ease;
}

.signal-list__item.is-active {
	font-weight: 500;
	color: var(--color-text-inverse);
}

.signal-list__track {
	display: flex;
	flex-direction: column;
	align-items: center;
	flex-shrink: 0;
	width: 40px;
}

.signal-list__marker {
	position: relative;
	z-index: 2;
	display: flex;
	align-items: center;
	justify-content: center;
	flex-shrink: 0;
	width: 36px;
	height: 36px;
	background-color: transparent;
	border: none;
	border-radius: 0;
	transition:
		border-color 0.4s ease,
		background-color 0.4s ease;
}

.signal-list__marker::before {
	content: '';
	flex-shrink: 0;
	width: 9px;
	height: 9px;
	margin-right:4px;
	background-color:var(--color-neutral-100);
	transition: opacity 0.4s ease;
}

.signal-list__number {
	display: none;
	font-size: 11px;
	font-weight: 500;
	line-height: 1;
	color: var(--color-text-inverse);
}

.signal-list__item.is-active .signal-list__marker {
	background-color: var(--color-neutral-100);
	border-radius: var(--radius-full);
}

.signal-list__item.is-active .signal-list__marker::before {
	opacity: 0;
	display: none;
}

.signal-list__item.is-active .signal-list__number {
	display: block;
	color: var(--color-neutral-900);
	font-size: 18px;
	font-weight: 400;
}

.signal-list__connector {
	width: 1px;
	height: var(--signal-os-list-gap);
	background-color: color-mix(in srgb, var(--color-text-inverse) 0%, transparent);
}

.signal-list__text {
	flex: 1;
	min-width: 0;
}

/* Desktop layout + pinned scroll */
@media (min-width: 1025px) {
	.signal-os-sticky-wrapper {
		min-height: 100vh;
	}

	.signal-os {
		display: flex;
		flex-direction: column;
		justify-content: center;
		min-height: 100vh;
	}

	.signal-os__container {
		grid-template-columns: minmax(0, 1fr) var(--signal-os-list-width);
	}

	.signal-os__content {
		pointer-events: auto;
	}
}

/* Tablet — keep 2-col, scale down */
@media (max-width: 1024px) and (min-width: 769px) {
	.signal-os__container {
		--signal-os-legend-width: 12rem;
		--signal-os-left-gap: var(--space-32);
		--signal-os-list-width: 20rem;
		--signal-os-list-gap: var(--space-48);

		padding: var(--space-48) var(--space-32);
	}

	.signal-os__heading {
		font-size: clamp(1.75rem, 4vw, 2.5rem);
	}

	.signal-os__description {
		max-width: 100%;
	}
}

/* Small tablet / large mobile — stack */
@media (max-width: 768px) {
	.signal-os__container {
		grid-template-columns: 1fr;
		gap: var(--space-40);
	}

	.signal-os__left {
		grid-template-columns: 1fr;
		gap: var(--space-32);
	}

	.signal-os__legend {
		align-self: start;
		width: 100%;
		max-width: 15.9375rem;
	}

	.signal-os__list {
		width: 100%;
	}
}

/* Mobile */
@media (max-width: 768px) {
	.signal-os-sticky-wrapper {
		min-height: 0;
	}

	.signal-os {
		min-height: 0;
	}

	.signal-os__container {
		padding: var(--space-48) var(--space-24);
	}

	.signal-os__pattern {
		width: min(18rem, 70vw);
	}

	.signal-list__item {
		font-size: var(--text-body-md-size);
	}

	.signal-list__connector {
		height: var(--space-48);
	}
}