/* =========================================================================
   SUMBRA design system
   Tokens are locked in the SUMBRA Development Handoff — do not introduce
   additional colours, typefaces or visual devices (gradients, glass,
   shadows, gold, rounded-card UI) without an explicit spec change.
   ========================================================================= */

:root {
	/* Colour tokens (SUMBRA Development Handoff §3) */
	--sumbra-carbon:  #1A1A1A;
	--sumbra-piedra:  #5A5651;
	--sumbra-arena:   #B7AA9A;
	--sumbra-lino:    #D8D2C6;
	--sumbra-marfil:  #F2EEE8;
	--sumbra-blanco:  #FFFFFF;

	/* Typography */
	--sumbra-font-display: "Cormorant Garamond", "Times New Roman", Georgia, serif;
	--sumbra-font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

	/* Layout */
	--sumbra-container-max: 1320px;
	--sumbra-gutter: 24px;
	--sumbra-section-space: 96px;

	/* Motion (kept near-zero; static-first per the handoff) */
	--sumbra-transition: 150ms ease;
}

@media (max-width: 782px) {
	:root {
		--sumbra-gutter: 20px;
		--sumbra-section-space: 64px;
	}
}

/* -------------------------------------------------------------------------
   Reset-lite + base
   ------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
	margin: 0;
	background: var(--sumbra-marfil);
	color: var(--sumbra-carbon);
	font-family: var(--sumbra-font-body);
	font-size: 16px;
	line-height: 1.6;
	-webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

a { color: inherit; text-decoration: none; }

ul { margin: 0; padding: 0; list-style: none; }

button {
	font-family: inherit;
	background: none;
	border: 0;
	cursor: pointer;
	color: inherit;
}

/* Visible keyboard focus everywhere — accessibility is not optional. */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
	outline: 2px solid var(--sumbra-carbon);
	outline-offset: 3px;
}

.sumbra-skip-link {
	position: absolute;
	left: -9999px;
	top: 0;
	background: var(--sumbra-carbon);
	color: var(--sumbra-blanco);
	padding: 12px 20px;
	z-index: 1000;
}
.sumbra-skip-link:focus {
	left: var(--sumbra-gutter);
	top: var(--sumbra-gutter);
}

@media (prefers-reduced-motion: reduce) {
	*, *::before, *::after {
		animation-duration: 0.001ms !important;
		animation-iteration-count: 1 !important;
		transition-duration: 0.001ms !important;
	}
}

/* -------------------------------------------------------------------------
   Grid / container
   ------------------------------------------------------------------------- */
.sumbra-container {
	max-width: var(--sumbra-container-max);
	margin-inline: auto;
	padding-inline: var(--sumbra-gutter);
}

.sumbra-section { padding-block: var(--sumbra-section-space); }

/* -------------------------------------------------------------------------
   Typography
   ------------------------------------------------------------------------- */
.sumbra-h1, .sumbra-h2, .sumbra-h3 {
	font-family: var(--sumbra-font-display);
	font-weight: 500;
	line-height: 1.1;
	margin: 0 0 20px;
	color: var(--sumbra-carbon);
}
.sumbra-h1 { font-size: clamp(2.5rem, 2rem + 2.2vw, 3.75rem); }
.sumbra-h2 { font-size: clamp(1.9rem, 1.6rem + 1.4vw, 2.75rem); }
.sumbra-h2--light, .sumbra-h1--light { color: var(--sumbra-marfil); }

.sumbra-eyebrow {
	font-family: var(--sumbra-font-body);
	font-size: 0.75rem;
	font-weight: 600;
	letter-spacing: 0.12em;
	text-transform: uppercase;
	color: var(--sumbra-piedra);
	margin: 0 0 12px;
}
.sumbra-eyebrow--light { color: var(--sumbra-lino); }

.sumbra-lead, .sumbra-body {
	max-width: 62ch;
	color: var(--sumbra-piedra);
	margin: 0 0 24px;
}
.sumbra-body--light { color: var(--sumbra-lino); }

.sumbra-accent-line {
	font-family: var(--sumbra-font-display);
	font-style: italic;
	font-size: 1.25rem;
	color: var(--sumbra-piedra);
	margin: 0 0 20px;
}

.sumbra-wordmark {
	font-family: var(--sumbra-font-display);
	font-size: 1.4rem;
	letter-spacing: 0.14em;
	color: var(--sumbra-carbon);
}
.sumbra-wordmark--light { color: var(--sumbra-marfil); }

/* -------------------------------------------------------------------------
   Buttons / links
   ------------------------------------------------------------------------- */
.sumbra-btn {
	display: inline-block;
	font-family: var(--sumbra-font-body);
	font-size: 0.8rem;
	font-weight: 600;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	padding: 16px 28px;
	border-radius: 0; /* square corners per spec */
	transition: opacity var(--sumbra-transition);
}
.sumbra-btn--primary {
	background: var(--sumbra-carbon);
	color: var(--sumbra-blanco);
}
.sumbra-btn--primary:hover { opacity: 0.85; }
.sumbra-btn--on-dark { background: var(--sumbra-marfil); color: var(--sumbra-carbon); }

.sumbra-link-arrow {
	display: inline-flex;
	align-items: center;
	gap: 6px;
	font-size: 0.8rem;
	font-weight: 600;
	letter-spacing: 0.06em;
	text-transform: uppercase;
	color: var(--sumbra-carbon);
	white-space: nowrap;
}
.sumbra-link-arrow--light { color: var(--sumbra-marfil); }
.sumbra-link-arrow span { transition: transform var(--sumbra-transition); }
.sumbra-link-arrow:hover span { transform: translateX(3px); }

/* -------------------------------------------------------------------------
   Media / placeholders
   ------------------------------------------------------------------------- */
.sumbra-media, .sumbra-media__img { width: 100%; }
.sumbra-media__img { object-fit: cover; }

.sumbra-placeholder {
	width: 100%;
	background: var(--sumbra-lino);
	display: flex;
	align-items: center;
	justify-content: center;
	text-align: center;
	color: var(--sumbra-piedra);
	padding: 20px;
}
.sumbra-placeholder__label {
	font-family: var(--sumbra-font-body);
	font-size: 0.8rem;
	letter-spacing: 0.04em;
}

/* Static tree-shadow motif: a quiet, low-opacity dappled-light texture.
   Purely decorative (aria-hidden via role on containers where used),
   no motion in Phase 1, respects prefers-reduced-motion by having none. */
.sumbra-tree-shadow {
	position: relative;
	background-image: url("../images/tree-shadow-overlay.svg");
	background-repeat: no-repeat;
	background-position: center;
	background-size: cover;
}

/* -------------------------------------------------------------------------
   Header
   ------------------------------------------------------------------------- */
.sumbra-header {
	background: var(--sumbra-marfil);
	border-bottom: 1px solid var(--sumbra-lino);
	position: relative;
	z-index: 100;
}
.sumbra-header__inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 24px;
	min-height: 84px;
}
.sumbra-nav__list {
	display: flex;
	align-items: center;
	gap: 32px;
}
.sumbra-nav__link {
	font-size: 0.8rem;
	font-weight: 600;
	letter-spacing: 0.06em;
	text-transform: uppercase;
	display: inline-flex;
	align-items: center;
	gap: 4px;
}
.sumbra-nav__item--has-dropdown { position: relative; }
.sumbra-dropdown {
	position: absolute;
	top: 100%;
	left: 0;
	min-width: 220px;
	background: var(--sumbra-marfil);
	border-top: 2px solid var(--sumbra-carbon);
	box-shadow: none;
	padding: 12px 0;
	display: none;
}
.sumbra-dropdown li a {
	display: block;
	padding: 10px 20px;
	font-size: 0.85rem;
}
.sumbra-dropdown li a:hover { background: var(--sumbra-lino); }

.sumbra-nav__item--has-dropdown:hover .sumbra-dropdown,
.sumbra-nav__item--has-dropdown:focus-within .sumbra-dropdown,
.sumbra-nav__item--has-dropdown .sumbra-dropdown.is-open {
	display: block;
}

.sumbra-hamburger { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.sumbra-hamburger span { width: 22px; height: 2px; background: var(--sumbra-carbon); }

.sumbra-mobile-nav { display: none; }

@media (max-width: 900px) {
	.sumbra-nav, .sumbra-header__cta { display: none; }
	.sumbra-hamburger { display: flex; }
	.sumbra-mobile-nav {
		border-top: 1px solid var(--sumbra-lino);
		padding: 20px var(--sumbra-gutter) 28px;
	}
	.sumbra-mobile-nav[hidden] { display: none; }
	.sumbra-mobile-nav:not([hidden]) { display: block; }
	.sumbra-mobile-nav__list > li { border-bottom: 1px solid var(--sumbra-lino); }
	.sumbra-mobile-nav__toggle, .sumbra-mobile-nav__list > li > a {
		display: flex;
		width: 100%;
		justify-content: space-between;
		padding: 16px 0;
		font-size: 0.9rem;
		font-weight: 600;
		text-transform: uppercase;
		letter-spacing: 0.06em;
		min-height: 44px;
		align-items: center;
	}
	.sumbra-mobile-nav__sub { padding-left: 12px; }
	.sumbra-mobile-nav__sub[hidden] { display: none; }
	.sumbra-mobile-nav__sub li a { display: block; padding: 10px 0; }
	.sumbra-mobile-nav__cta { display: block; text-align: center; margin-top: 20px; }
}

/* -------------------------------------------------------------------------
   Hero
   ------------------------------------------------------------------------- */
.sumbra-hero__grid {
	display: grid;
	grid-template-columns: 5fr 7fr;
	gap: 48px;
	align-items: center;
}
.sumbra-hero__ctas { display: flex; align-items: center; gap: 28px; flex-wrap: wrap; margin-bottom: 32px; }
.sumbra-hero__context {
	font-size: 0.75rem;
	letter-spacing: 0.1em;
	color: var(--sumbra-piedra);
	text-transform: uppercase;
}
.sumbra-hero__media .sumbra-placeholder { aspect-ratio: 8/9; }

@media (max-width: 900px) {
	.sumbra-hero__grid { grid-template-columns: 1fr; }
}

/* -------------------------------------------------------------------------
   Recognition
   ------------------------------------------------------------------------- */
.sumbra-recognition__grid {
	display: grid;
	grid-template-columns: 7fr 5fr;
	gap: 48px;
	align-items: center;
}
.sumbra-recognition__options {
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	gap: 20px;
	border-top: 1px solid var(--sumbra-lino);
	padding-top: 24px;
}
.sumbra-recognition__options li {
	font-size: 0.95rem;
	font-weight: 600;
	border-left: 1px solid var(--sumbra-lino);
	padding-left: 16px;
}
@media (max-width: 900px) {
	.sumbra-recognition__grid { grid-template-columns: 1fr; }
	.sumbra-recognition__options { grid-template-columns: 1fr 1fr; }
}

/* -------------------------------------------------------------------------
   Section head (eyebrow/title + link, shared pattern)
   ------------------------------------------------------------------------- */
.sumbra-section__head {
	display: flex;
	justify-content: space-between;
	align-items: flex-end;
	gap: 24px;
	margin-bottom: 40px;
	flex-wrap: wrap;
}

/* -------------------------------------------------------------------------
   Projects
   ------------------------------------------------------------------------- */
.sumbra-projects__grid {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 32px;
}
.sumbra-project-card__title {
	font-family: var(--sumbra-font-body);
	font-weight: 600;
	letter-spacing: 0.04em;
	text-transform: uppercase;
	font-size: 0.85rem;
	margin: 16px 0 4px;
}
.sumbra-project-card__location { color: var(--sumbra-piedra); font-size: 0.85rem; margin: 0 0 4px; }
.sumbra-project-card__systems { font-size: 0.75rem; letter-spacing: 0.06em; color: var(--sumbra-piedra); }
@media (max-width: 900px) {
	.sumbra-projects__grid { grid-template-columns: 1fr; }
}

/* -------------------------------------------------------------------------
   Solutions
   ------------------------------------------------------------------------- */
.sumbra-solutions__grid {
	display: grid;
	grid-template-columns: 1.4fr 1.4fr 1fr;
	gap: 4px;
}
.sumbra-solution-tile {
	position: relative;
	min-height: 320px;
	display: flex;
	align-items: flex-end;
	background: var(--sumbra-carbon);
	overflow: hidden;
}
.sumbra-solution-tile .sumbra-placeholder {
	position: absolute;
	inset: 0;
	height: 100%;
	opacity: 0.55;
}
.sumbra-solution-tile__content {
	position: relative;
	z-index: 1;
	padding: 28px;
}
.sumbra-solution-tile__title {
	font-family: var(--sumbra-font-display);
	font-size: 1.5rem;
	color: var(--sumbra-marfil);
	margin: 0 0 16px;
}
@media (max-width: 900px) {
	.sumbra-solutions__grid { grid-template-columns: 1fr; }
}

/* -------------------------------------------------------------------------
   Process + Point of View
   ------------------------------------------------------------------------- */
.sumbra-process-pov__grid {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 4px;
}
.sumbra-process { background: var(--sumbra-marfil); padding: 64px var(--sumbra-gutter); }
.sumbra-process__steps { display: flex; flex-wrap: wrap; gap: 32px; margin-top: 32px; }
.sumbra-process__steps li { display: flex; flex-direction: column; gap: 8px; min-width: 90px; }
.sumbra-process__num { font-family: var(--sumbra-font-display); font-size: 1.5rem; color: var(--sumbra-piedra); }

.sumbra-pov {
	background-color: var(--sumbra-carbon);
	color: var(--sumbra-marfil);
	padding: 64px var(--sumbra-gutter);
	display: flex;
	flex-direction: column;
	justify-content: center;
}
@media (max-width: 900px) {
	.sumbra-process-pov__grid { grid-template-columns: 1fr; }
}

/* -------------------------------------------------------------------------
   Ideas
   ------------------------------------------------------------------------- */
.sumbra-ideas__grid {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 32px;
}
.sumbra-idea-card--featured { grid-column: span 3; display: grid; grid-template-columns: 1.3fr 1fr; gap: 32px; align-items: center; }
.sumbra-idea-card--featured .sumbra-media__img,
.sumbra-idea-card--featured .sumbra-placeholder { aspect-ratio: 16/10; }
.sumbra-idea-card__title {
	font-family: var(--sumbra-font-display);
	font-size: 1.3rem;
	margin: 4px 0 8px;
}
.sumbra-idea-card--featured .sumbra-idea-card__title { font-size: 1.9rem; }
@media (max-width: 900px) {
	.sumbra-ideas__grid { grid-template-columns: 1fr; }
	.sumbra-idea-card--featured { grid-column: span 1; grid-template-columns: 1fr; }
}

/* -------------------------------------------------------------------------
   Final CTA
   ------------------------------------------------------------------------- */
.sumbra-final-cta { background-color: var(--sumbra-carbon); }
.sumbra-final-cta__inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 24px;
	flex-wrap: wrap;
}
@media (max-width: 600px) {
	.sumbra-final-cta__inner { flex-direction: column; align-items: flex-start; }
}

/* -------------------------------------------------------------------------
   Footer
   ------------------------------------------------------------------------- */
.sumbra-footer { background: var(--sumbra-carbon); color: var(--sumbra-lino); padding-block: 64px 32px; }
.sumbra-footer__grid {
	display: grid;
	grid-template-columns: 1.6fr 1fr 1fr 1fr;
	gap: 32px;
}
.sumbra-footer h2 {
	font-family: var(--sumbra-font-body);
	font-size: 0.75rem;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--sumbra-arena);
	margin: 0 0 16px;
}
.sumbra-footer ul li { margin-bottom: 10px; font-size: 0.9rem; }
.sumbra-footer a:hover { color: var(--sumbra-marfil); }
.sumbra-footer__tagline { font-size: 0.85rem; margin-top: 12px; max-width: 32ch; }
.sumbra-footer__legal {
	grid-column: 1 / -1;
	border-top: 1px solid rgba(216,210,198,0.2);
	margin-top: 32px;
	padding-top: 20px;
	display: flex;
	justify-content: space-between;
	gap: 12px;
	flex-wrap: wrap;
	font-size: 0.75rem;
}
@media (max-width: 900px) {
	.sumbra-footer__grid { grid-template-columns: 1fr 1fr; }
}

/* -------------------------------------------------------------------------
   Generic prose fallback (Solution stub pages, etc.)
   ------------------------------------------------------------------------- */
.sumbra-prose { max-width: 68ch; color: var(--sumbra-piedra); }
.sumbra-note { color: var(--sumbra-piedra); }