/**
 * Styles the shared document shell: header, footer, and simple system pages.
 *
 * Homepage bands have their own stylesheets; this file only owns elements that
 * appear across the theme's templates.
 */

.inv-container {
	width: min(100% - (var(--inv-gutter) * 2), var(--inv-container));
	margin-inline: auto;
}

.skip-link {
	position: fixed;
	top: var(--inv-space-sm);
	left: var(--inv-space-sm);
	z-index: calc(var(--inv-z-menu) + 1);
	padding: var(--inv-space-xs) var(--inv-space-sm);
	background: var(--inv-paper);
	color: var(--inv-text);
	transform: translateY(-200%);
}

.skip-link:focus {
	transform: translateY(0);
}

.site-header {
	position: fixed;
	top: 0;
	left: 0;
	z-index: var(--inv-z-header);
	width: 100%;
	border-bottom: 1px solid var(--inv-line-soft);
	background: linear-gradient(to bottom, var(--inv-ink-header), var(--inv-ink-transparent));
	color: var(--inv-text-inv);
	transition: background-color 0.3s ease, box-shadow 0.3s ease, backdrop-filter 0.3s ease;
}

/* Without JS we cannot watch the scroll position, so keep the bar solid at all
   times — the white logo and links must stay legible over the light sections. */
html:not(.inv-js) .site-header {
	background: var(--inv-ink-header);
}

/* Scrolled past the hero: solidify + frost the fixed header so it reads over
   the light paper bands. Toggled by assets/js/modules/site-header.js. */
.site-header.is-stuck {
	background: var(--inv-ink-header);
	-webkit-backdrop-filter: blur(12px);
	backdrop-filter: blur(12px);
	box-shadow: 0 12px 30px -24px rgba(0, 0, 0, 0.9);
}

.site-header__inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	min-height: var(--inv-header-height);
	gap: var(--inv-space-lg);
}

.site-brand {
	display: inline-flex;
	flex: 0 0 auto;
	align-items: center;
	width: 12.5rem;
}

.site-brand img {
	width: 100%;
	height: auto;
}

.primary-nav {
	display: flex;
	align-items: center;
	gap: clamp(1rem, 2vw, 2.75rem);
}

.primary-nav__list {
	display: flex;
	align-items: center;
	gap: clamp(0.85rem, 1.8vw, 2.25rem);
}

/* Scoped to the list, not the whole nav: the "Start a project" CTA is also an
   <a> inside .primary-nav, and a bare `.primary-nav a` beats `.button--header`
   on specificity — which painted the CTA's label gold on its gold hover fill
   and left it unreadable. Nav links style nav links; the button owns itself. */
.primary-nav__list a {
	font-family: var(--inv-font-mono);
	font-size: 0.6875rem;
	font-weight: 700;
	letter-spacing: 0.07em;
	text-transform: uppercase;
	transition: color var(--inv-duration-fast) var(--inv-ease);
}

.primary-nav__list a:hover {
	color: var(--inv-signal);
}

.primary-nav__list a[aria-current] {
	color: var(--inv-signal);
}

/* Services disclosure. Pure CSS: the sublist reveals on hover and focus-within
   so it is keyboard-usable with no JavaScript; every link is always in the DOM
   so nothing is trapped when scripting is off (guide §1.6). */
.primary-nav__has-sub {
	position: relative;
}

.primary-nav__has-sub > a {
	display: inline-flex;
	align-items: center;
	gap: 0.4em;
}

.primary-nav__has-sub > a::after {
	width: 0.42em;
	height: 0.42em;
	border-right: 1.5px solid currentColor;
	border-bottom: 1.5px solid currentColor;
	transform: translateY(-0.15em) rotate(45deg);
	transition: transform var(--inv-duration-fast) var(--inv-ease);
	content: "";
}

.primary-nav__has-sub:hover > a::after,
.primary-nav__has-sub:focus-within > a::after {
	transform: translateY(0.05em) rotate(225deg);
}

.primary-nav__sub {
	position: absolute;
	top: calc(100% + 0.6rem);
	left: -1rem;
	z-index: var(--inv-z-menu);
	display: grid;
	gap: var(--inv-space-xs);
	min-width: 13.5rem;
	padding: var(--inv-space-md) var(--inv-space-sm);
	border: 1px solid var(--inv-line-soft);
	background: var(--inv-ink-2);
	box-shadow: 0 24px 48px -28px rgba(0, 0, 0, 0.9);
	opacity: 0;
	visibility: hidden;
	transform: translateY(0.5rem);
	transition: opacity var(--inv-duration-fast) var(--inv-ease), transform var(--inv-duration-fast) var(--inv-ease), visibility var(--inv-duration-fast);
}

.primary-nav__has-sub:hover .primary-nav__sub,
.primary-nav__has-sub:focus-within .primary-nav__sub {
	opacity: 1;
	visibility: visible;
	transform: none;
}

.menu-toggle {
	display: none;
	width: 2.75rem;
	height: 2.75rem;
	padding: var(--inv-space-xs);
	border: 1px solid var(--inv-line-inv);
	border-radius: 50%;
	background: transparent;
	color: var(--inv-text-inv);
}

.menu-toggle svg {
	width: 100%;
	height: 100%;
	fill: none;
	stroke: currentColor;
	stroke-linecap: round;
	stroke-width: 1.6;
}

.menu-toggle__close {
	display: none;
}

/* Desktop header: logo left · menu centered · CTA right. display:contents drops
   the nav wrapper so the list + CTA sit directly in the header's 3-column grid,
   centering the menu regardless of logo/CTA width. Mobile (≤46rem) keeps the
   slide-in panel below and is unaffected (this only applies above that width). */
@media (min-width: 46.0625rem) {
	.site-header__inner {
		display: grid;
		grid-template-columns: 1fr auto 1fr;
	}

	.site-brand {
		width: 13rem;
	}

	.primary-nav {
		display: contents;
	}

	.primary-nav__list {
		justify-self: center;
	}

	.button--header {
		justify-self: end;
	}
}

.site-footer {
	padding-top: var(--inv-sect);
	background: var(--inv-ink);
	color: var(--inv-text-inv);
}

.site-footer__inner {
	display: grid;
	gap: var(--inv-space-xl);
	padding-bottom: var(--inv-space-2xl);
}

.site-footer__col {
	display: grid;
	align-content: start;
	gap: var(--inv-space-sm);
}

.site-footer__brand {
	gap: var(--inv-space-md);
}

.site-footer__brand .site-brand {
	width: 11rem;
}

.site-footer__line {
	max-width: 22rem;
	color: var(--inv-text-inv);
	font-size: 0.9375rem;
}

.site-footer__slate {
	color: var(--inv-muted-inv);
	font-family: var(--inv-font-mono);
	font-size: 0.7rem;
	letter-spacing: 0.06em;
	text-transform: uppercase;
}

.site-footer__label {
	color: var(--inv-signal);
	font-family: var(--inv-font-mono);
	font-size: 0.65rem;
	font-weight: 700;
	letter-spacing: 0.09em;
	text-transform: uppercase;
}

.site-footer__col a {
	font-size: 0.9rem;
	transition: color var(--inv-duration-fast) var(--inv-ease);
}

.site-footer__col a:hover,
.site-footer__col a:focus-visible,
.site-footer__bottom a:hover,
.site-footer__bottom a:focus-visible {
	color: var(--inv-signal);
}

.site-footer__cta {
	justify-self: start;
	margin-bottom: var(--inv-space-2xs);
}

.site-footer__email {
	font-family: var(--inv-font-mono);
	font-size: 0.82rem;
	letter-spacing: 0.02em;
}

.site-footer__note {
	color: var(--inv-muted-inv);
	font-size: 0.85rem;
}

.site-footer__bottom {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	justify-content: space-between;
	gap: var(--inv-space-sm) var(--inv-space-lg);
	padding-block: var(--inv-space-md);
	border-top: 1px solid var(--inv-line-soft);
	color: var(--inv-muted-inv);
	font-family: var(--inv-font-mono);
	font-size: 0.6875rem;
	letter-spacing: 0.04em;
}

.site-footer__legal {
	display: flex;
	flex-wrap: wrap;
	gap: var(--inv-space-sm) var(--inv-space-md);
	text-transform: uppercase;
}

.system-page {
	min-height: 70vh;
	padding-block: calc(var(--inv-header-height) + var(--inv-sect)) var(--inv-sect);
	background: var(--inv-paper);
}

.system-page h1 {
	max-width: 50rem;
	margin-block: var(--inv-space-sm) var(--inv-space-lg);
}

.entry-content {
	margin-top: var(--inv-space-lg);
}

.entry-content > * + * {
	margin-top: var(--inv-space-md);
}

/* 404 — a small, on-brand ink scene instead of a dead end (plans/10). */
.error-404 {
	display: grid;
	place-items: center;
	min-height: 78vh;
	padding-block: calc(var(--inv-header-height) + var(--inv-sect)) var(--inv-sect);
	background: var(--inv-ink) var(--inv-backdrop) center / cover no-repeat;
	color: var(--inv-text-inv);
	text-align: center;
}

.error-404__inner {
	display: grid;
	justify-items: center;
	gap: var(--inv-space-md);
	width: min(100% - (var(--inv-gutter) * 2), 44rem);
}

.error-404__slate {
	color: var(--inv-signal);
	font-family: var(--inv-font-mono);
	font-size: 0.75rem;
	font-weight: 700;
	letter-spacing: 0.16em;
	text-transform: uppercase;
}

.error-404__title {
	max-width: 20ch;
}

.error-404__title .error-404__dot {
	color: var(--inv-signal);
}

.error-404__line {
	max-width: 44ch;
	margin-inline: auto;
	color: var(--inv-muted-inv);
}

.error-404__actions {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	gap: var(--inv-space-sm);
	margin-top: var(--inv-space-sm);
}

@media (min-width: 40rem) {
	.site-footer__inner {
		grid-template-columns: repeat(2, minmax(0, 1fr));
		align-items: start;
	}

	.site-footer__brand {
		grid-column: 1 / -1;
	}
}

@media (min-width: 62rem) {
	.site-footer__inner {
		grid-template-columns: 1.5fr 1fr 1fr 1.15fr;
	}

	.site-footer__brand {
		grid-column: auto;
	}
}

@media (max-width: 46rem) {
	.menu-toggle {
		display: inline-grid;
		place-items: center;
	}

	.inv-js .primary-nav {
		position: fixed;
		top: var(--inv-header-height);
		left: 0;
		z-index: var(--inv-z-menu);
		display: grid;
		grid-template-rows: 1fr auto;
		align-items: start;
		width: 100%;
		height: calc(100dvh - var(--inv-header-height));
		padding: var(--inv-space-xl) var(--inv-gutter) var(--inv-space-lg);
		background: var(--inv-ink);
		clip-path: inset(0 0 100% 0);
		pointer-events: none;
		transition: clip-path var(--inv-duration) var(--inv-ease);
	}

	.inv-js .primary-nav.is-open {
		clip-path: inset(0);
		pointer-events: auto;
	}

	.primary-nav__list {
		display: grid;
		gap: var(--inv-space-md);
	}

	.primary-nav__list a {
		font-family: var(--inv-font-display);
		font-size: clamp(2rem, 8vw, 3.75rem);
		letter-spacing: -0.06em;
		text-transform: none;
	}

	/* Full-screen menu: drop the dropdown and show the four services as a plain
	   indented sublist so every link is reachable by touch (no hover). */
	.primary-nav__has-sub > a::after {
		display: none;
	}

	.primary-nav__sub {
		position: static;
		display: grid;
		gap: var(--inv-space-sm);
		min-width: 0;
		margin-top: var(--inv-space-sm);
		padding: 0 0 0 var(--inv-space-sm);
		border: 0;
		border-left: 2px solid var(--inv-line-soft);
		background: transparent;
		box-shadow: none;
		opacity: 1;
		visibility: visible;
		transform: none;
	}

	.primary-nav__sub a {
		font-family: var(--inv-font-mono);
		font-size: 0.9rem;
		letter-spacing: 0.06em;
		text-transform: uppercase;
	}

	.menu-toggle[aria-expanded="true"] .menu-toggle__open {
		display: none;
	}

	.menu-toggle[aria-expanded="true"] .menu-toggle__close {
		display: block;
	}
}

@media (max-width: 31rem) {
	.button--header {
		display: none;
	}
}