/* ==========================================================================
   NAVIGATION — smart header, menu button, full-screen night-map overlay,
   display settings (a11y) panel
   --------------------------------------------------------------------------
   Header states (set by assets/js/navigation.js on [data-sac-header]):
     .is-scrolled  solid, frosted bar (otherwise transparent over the hero)
     .is-hidden    slid away while scrolling down; returns on scroll up
   The transparent state only exists with JS on the front page, so without JS
   the header is always the readable solid bar.
   ========================================================================== */

.sac-header {
	--hdr-fg: var(--c-heading);
	--hdr-line: var(--c-border);
	position: fixed;
	z-index: var(--z-header);
	inset: 0 0 auto;
	height: var(--header-h);
	color: var(--hdr-fg);
	background: color-mix(in srgb, var(--c-bg) 84%, transparent);
	-webkit-backdrop-filter: saturate(1.4) blur(14px);
	backdrop-filter: saturate(1.4) blur(14px);
	box-shadow: inset 0 -1px 0 var(--hdr-line);
	transition:
		transform var(--dur-2) var(--ease-out),
		background-color var(--dur-2) ease,
		box-shadow var(--dur-2) ease,
		color var(--dur-2) ease;
}

/* Over the hero photo: transparent, white, with a soft top scrim for legibility. */
.js .home .sac-header:not(.is-scrolled) {
	--hdr-fg: var(--c-white);
	--hdr-line: transparent;
	background: linear-gradient(to bottom, rgb(7 13 24 / 0.42), transparent);
	-webkit-backdrop-filter: none;
	backdrop-filter: none;
}

.sac-header.is-hidden {
	transform: translateY(-100%);
}

.sac-header__inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--space-4);
	height: 100%;
}

/* Reading progress — a hairline of trail-red along the bottom edge. */
.sac-header__progress {
	position: absolute;
	inset: auto 0 0;
	height: 2px;
	background: var(--c-accent);
	transform: scaleX(var(--progress, 0));
	transform-origin: left center;
}

/* --- Brand -------------------------------------------------------------- */
.sac-brand {
	flex: 1 1 auto;
	min-width: 0;
}

.sac-brand__link {
	display: inline-flex;
	max-width: 100%;
	align-items: center;
	gap: var(--space-3);
	color: inherit;
	text-decoration: none;
}

.sac-brand__link:hover {
	color: inherit;
}

.sac-brand__mark {
	flex: none;
	width: 1.9rem;
	height: 1.9rem;
	padding: 0.3rem;
	color: var(--c-on-accent);
	background: var(--c-accent);
	transition: transform var(--dur-2) var(--ease-out);
}

.sac-brand__link:hover .sac-brand__mark {
	transform: translateY(-2px);
}

.sac-brand__name {
	font-weight: 700;
	font-size: 1.05rem;
	letter-spacing: 0.01em;
	white-space: nowrap;
	overflow: hidden;
	text-overflow: ellipsis;
}

.sac-brand .custom-logo {
	width: auto;
	max-height: calc(var(--header-h) - 1.75rem);
}

/* --- Header actions ----------------------------------------------------- */
.sac-header__actions {
	display: flex;
	align-items: center;
	gap: var(--space-2);
}

/* Round icon button (display settings, login). */
.sac-iconbtn {
	display: inline-grid;
	place-items: center;
	flex: none;
	width: 2.75rem;
	height: 2.75rem;
	padding: 0;
	color: inherit;
	background: transparent;
	border: 1px solid color-mix(in srgb, currentColor 22%, transparent);
	border-radius: 50%;
	text-decoration: none;
	transition:
		border-color var(--dur-1) ease,
		box-shadow var(--dur-1) ease,
		transform var(--dur-1) ease;
}

.sac-iconbtn svg {
	width: 1.15rem;
}

.sac-iconbtn:hover,
.sac-iconbtn[aria-expanded="true"] {
	color: inherit;
	border-color: var(--c-accent);
	box-shadow: var(--ring-hover);
}

.sac-iconbtn:active {
	transform: scale(0.96);
}

/* Menu button — label + two lines that morph into an X. */
.sac-menu-btn {
	display: inline-flex;
	align-items: center;
	gap: var(--space-3);
	height: 2.75rem;
	padding: 0 var(--space-3) 0 var(--space-5);
	color: inherit;
	background: transparent;
	border: 1px solid color-mix(in srgb, currentColor 22%, transparent);
	border-radius: 999px;
	font-family: var(--font-mono);
	font-size: var(--fs-xs);
	letter-spacing: var(--ls-mono);
	text-transform: uppercase;
	transition:
		background-color var(--dur-2) var(--ease-out),
		color var(--dur-2) var(--ease-out),
		border-color var(--dur-2) var(--ease-out);
}

.sac-menu-btn:hover {
	color: var(--c-bg);
	background: var(--hdr-fg, var(--c-heading));
	border-color: var(--hdr-fg, var(--c-heading));
}

.js .home .sac-header:not(.is-scrolled) .sac-menu-btn:hover {
	color: var(--c-navy-900);
}

.sac-menu-btn__icon {
	position: relative;
	display: block;
	width: 1.5rem;
	height: 1.5rem;
}

.sac-menu-btn__icon span {
	position: absolute;
	left: 0.2rem;
	right: 0.2rem;
	height: 1.5px;
	background: currentColor;
	transition: transform var(--dur-2) var(--ease-out), left var(--dur-2) var(--ease-out), top var(--dur-2) var(--ease-out);
}

.sac-menu-btn__icon span:first-child { top: 0.5rem; }
.sac-menu-btn__icon span:last-child  { top: 0.95rem; left: 0.6rem; }

.sac-menu-btn:hover .sac-menu-btn__icon span:last-child {
	left: 0.2rem;
}

.sac-menu-btn.is-close .sac-menu-btn__icon span {
	top: 0.72rem;
	left: 0.2rem;
}

.sac-menu-btn.is-close .sac-menu-btn__icon span:first-child { transform: rotate(45deg); }
.sac-menu-btn.is-close .sac-menu-btn__icon span:last-child  { transform: rotate(-45deg); }

@media (max-width: 479px) {
	.sac-menu-btn {
		padding-left: var(--space-3);
	}

	.sac-menu-btn__label {
		position: absolute;
		width: 1px;
		height: 1px;
		overflow: hidden;
		clip-path: inset(50%);
	}
}

/* ==========================================================================
   OVERLAY — the night map
   ========================================================================== */

.sac-overlay {
	position: fixed;
	z-index: var(--z-overlay);
	inset: 0;
	display: flex;
	flex-direction: column;
	overflow-y: auto;
	overscroll-behavior: contain;
	background: var(--c-bg);
	isolation: isolate;
}

/* Closed (JS only): curtain drawn up. Opening lowers it like a map unrolled. */
.js .sac-overlay {
	visibility: hidden;
	clip-path: inset(0 0 100% 0);
	transition:
		clip-path var(--dur-3) var(--ease-in-out),
		visibility 0s linear var(--dur-3);
}

.js .sac-overlay.is-open {
	visibility: visible;
	clip-path: inset(0);
	transition: clip-path var(--dur-3) var(--ease-in-out), visibility 0s;
}

.sac-overlay__topo {
	position: absolute;
	z-index: -1;
	inset: 0;
	width: 100%;
	height: 100%;
	color: var(--c-topo);
	--topo-minor: 0.55;
	-webkit-mask-image: linear-gradient(105deg, transparent 15%, #000 75%);
	mask-image: linear-gradient(105deg, transparent 15%, #000 75%);
}

/* The contours are surveyed in after the curtain. */
.js .sac-overlay .sac-overlay__topo {
	clip-path: inset(0 100% 0 0);
	transition: clip-path 1.6s var(--ease-out) 0.25s;
}

.js .sac-overlay.is-open .sac-overlay__topo {
	clip-path: inset(0);
}

.sac-overlay__bar {
	display: flex;
	align-items: center;
	justify-content: space-between;
	flex: none;
	height: var(--header-h);
	color: var(--c-heading);
}

.sac-overlay__brand {
	font-family: var(--font-mono);
	font-size: var(--fs-xs);
	letter-spacing: var(--ls-mono);
	text-transform: uppercase;
	color: var(--c-text-muted);
}

.sac-overlay__body {
	display: grid;
	grid-template-columns: minmax(0, 1fr);
	align-content: center;
	gap: var(--space-8);
	flex: 1;
	padding-block: var(--space-7) var(--space-8);
}

@media (min-width: 1024px) {
	.sac-overlay__body {
		grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
		align-items: start;
		gap: var(--space-9);
	}

	.sac-overlay__aside {
		padding-left: var(--space-8);
		border-left: 1px solid var(--c-border);
	}
}

/* --- The menu: numbered, big, uppercase --------------------------------- */
.sac-menu,
.sac-menu .sub-menu {
	margin: 0;
	padding: 0;
	list-style: none;
}

.sac-menu {
	counter-reset: sac-menu;
}

.sac-menu > li {
	counter-increment: sac-menu;
	padding-block: var(--space-2);
}

.sac-menu > li > a {
	display: inline-flex;
	align-items: flex-start;
	gap: var(--space-4);
	color: var(--c-heading);
	font-size: clamp(2rem, 1.2rem + 3.6vw, 4.4rem);
	font-weight: 700;
	line-height: 1;
	letter-spacing: -0.02em;
	text-transform: uppercase;
	text-decoration: none;
	transition: color var(--dur-2) var(--ease-out), transform var(--dur-2) var(--ease-out);
}

.sac-menu > li > a::before {
	content: counter(sac-menu, decimal-leading-zero);
	min-width: 2ch;
	padding-top: 0.35em;
	font-family: var(--font-mono);
	font-size: var(--fs-xs);
	font-weight: 400;
	letter-spacing: 0.1em;
	color: var(--c-text-muted);
	transition: color var(--dur-2) var(--ease-out);
}

.sac-menu > li > a:hover,
.sac-menu > li > a:focus-visible,
.sac-menu > .current-menu-item > a,
.sac-menu > .current-menu-ancestor > a {
	color: var(--c-accent-light);
	transform: translateX(0.25em);
}

.sac-menu > li > a:hover::before,
.sac-menu > .current-menu-item > a::before {
	color: var(--c-accent-light);
}

/* Sub-items run as a quiet line beneath their parent. */
.sac-menu .sub-menu {
	display: flex;
	flex-wrap: wrap;
	gap: var(--space-1) var(--space-5);
	padding: var(--space-3) 0 var(--space-2) calc(2ch + var(--space-4));
	font-size: var(--fs-body);
}

.sac-menu .sub-menu a {
	color: var(--c-text-muted);
	text-decoration: none;
	background: linear-gradient(currentColor, currentColor) left bottom / 0 1px no-repeat;
	transition: color var(--dur-1) ease, background-size var(--dur-2) var(--ease-out);
}

.sac-menu .sub-menu a:hover,
.sac-menu .sub-menu .current-menu-item > a {
	color: var(--c-heading);
	background-size: 100% 1px;
}

/* Stagger: items rise in once the curtain has dropped (--i set by JS). */
.js .sac-overlay .sac-menu > li,
.js .sac-overlay .sac-overlay__aside > * {
	opacity: 0;
	transform: translateY(1.25rem);
	transition: opacity var(--dur-2) ease, transform var(--dur-3) var(--ease-out);
}

.js .sac-overlay.is-open .sac-menu > li,
.js .sac-overlay.is-open .sac-overlay__aside > * {
	opacity: 1;
	transform: none;
	transition-delay: calc(320ms + var(--i, 0) * 60ms);
}

/* --- Aside: search, contact, language ----------------------------------- */
.sac-overlay__aside {
	display: grid;
	gap: var(--space-7);
	align-content: start;
}

.sac-overlay__label {
	margin: 0 0 var(--space-4);
	font-family: var(--font-mono);
	font-size: var(--fs-xs);
	font-weight: 400;
	letter-spacing: var(--ls-mono);
	text-transform: uppercase;
	color: var(--c-text-muted);
}

.sac-overlay__contact-body {
	font-style: normal;
	line-height: 1.7;
}

.sac-overlay__contact-name {
	font-weight: 700;
	color: var(--c-heading);
}

.sac-overlay__lang:empty {
	display: none;
}

/* ==========================================================================
   DISPLAY SETTINGS — font size + colour scheme (a11y-controls.php)
   ========================================================================== */

.sac-a11y {
	position: relative;
}

.sac-a11y__toggle-icon {
	font-weight: 700;
	font-size: 1rem;
	line-height: 1;
}

.sac-a11y__toggle-icon::after {
	content: "a";
	font-size: 0.72em;
	font-weight: 600;
}

/* A small sheet; full-width under the header on phones. The panel lives in
   the header but carries the page's own (non-transparent) colours. */
.sac-a11y__panel {
	position: fixed;
	top: calc(var(--header-h) + var(--space-2));
	left: var(--gutter);
	right: var(--gutter);
	display: grid;
	gap: var(--space-5);
	padding: var(--space-5);
	color: var(--c-text);
	background: var(--c-surface);
	border: 1px solid var(--c-border);
	box-shadow: var(--shadow-lg);
	animation: sac-pop var(--dur-2) var(--ease-out);
}

@media (min-width: 600px) {
	.sac-a11y__panel {
		position: absolute;
		top: calc(100% + var(--space-3));
		left: auto;
		right: 0;
		width: 20rem;
	}
}

.sac-a11y__panel[hidden] {
	display: none;
}

@keyframes sac-pop {
	from { opacity: 0; transform: translateY(-6px); }
}

.sac-a11y__group {
	margin: 0;
	padding: 0;
	border: 0;
	min-width: 0;
}

.sac-a11y__legend {
	margin-bottom: var(--space-3);
	padding: 0;
	font-family: var(--font-mono);
	font-size: var(--fs-xs);
	letter-spacing: var(--ls-mono);
	text-transform: uppercase;
	color: var(--c-text-muted);
}

/* Segmented control. */
.sac-seg {
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	gap: 2px;
	padding: 3px;
	background: var(--c-surface-2);
	border: 1px solid var(--c-border);
	border-radius: 999px;
}

.sac-seg__option {
	min-height: 2.5rem;
	padding: 0 var(--space-2);
	color: var(--c-text);
	background: transparent;
	border: 0;
	border-radius: 999px;
	font-size: var(--fs-sm);
	font-weight: 600;
	transition: background-color var(--dur-1) ease, color var(--dur-1) ease;
}

.sac-seg__option:hover {
	background: color-mix(in srgb, var(--c-text) 8%, transparent);
}

.sac-seg__option[aria-checked="true"] {
	color: var(--c-bg);
	background: var(--c-heading);
}

/* ==========================================================================
   NO-JS — everything stays reachable
   ========================================================================== */

.no-js .sac-a11y,
.no-js .sac-menu-btn {
	display: none;
}

.no-js .sac-overlay {
	position: static;
	min-height: 0;
}