/* INSPIRE Mobile Nav
 * Structural styles. Colours come from CSS variables set inline on .imn;
 * placement / icon / animation come from modifier classes on .imn.
 * The breakpoint media query is printed inline by the plugin.
 */

.imn {
	--imn-bar: #1a1a1a;
	--imn-bar-open: #ffffff;
	--imn-overlay-bg: rgba(15, 46, 29, 0.97);
	--imn-text: #ffffff;
	--imn-bar-w: 30px;
	--imn-bar-thickness: 2px;
	--imn-bar-gap: 5px;
	/* Distance each end bar travels to meet in the middle for the X. */
	--imn-bar-move: calc(var(--imn-bar-thickness) + var(--imn-bar-gap));
	--imn-z: 100000;
	--imn-z-top: 100001;
}

/* Hidden checkbox drives the open/closed state (no JS needed to open). */
.imn-toggle {
	position: absolute;
	width: 1px;
	height: 1px;
	margin: -1px;
	padding: 0;
	border: 0;
	overflow: hidden;
	clip: rect(0 0 0 0);
	white-space: nowrap;
}

/* Screen-reader-only text inside the label. */
.imn-sr {
	position: absolute !important;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	border: 0;
	white-space: nowrap;
}

/* ---- Hamburger button ---- */
.imn-hamburger {
	display: inline-flex;
	flex-direction: column;
	justify-content: center;
	gap: var(--imn-bar-gap);
	width: var(--imn-bar-w);
	cursor: pointer;
	box-sizing: border-box;
	position: relative;
	z-index: var(--imn-z-top);
}

.imn-hamburger .imn-bar {
	display: block;
	width: 100%;
	height: var(--imn-bar-thickness);
	background: var(--imn-bar);
	border-radius: 2px;
	transition: transform 0.3s ease, opacity 0.3s ease, background-color 0.3s ease;
}

/* Animate the three bars into an X and recolour when open.
   The end bars move by (thickness + gap) so the X stays centred at any size. */
.imn-toggle:checked + .imn-hamburger .imn-bar {
	background: var(--imn-bar-open);
}
.imn-toggle:checked + .imn-hamburger .imn-bar:nth-child(2) {
	transform: translateY(var(--imn-bar-move)) rotate(45deg);
}
.imn-toggle:checked + .imn-hamburger .imn-bar:nth-child(3) {
	opacity: 0;
}
.imn-toggle:checked + .imn-hamburger .imn-bar:nth-child(4) {
	transform: translateY(calc(-1 * var(--imn-bar-move))) rotate(-45deg);
}

/* Fixed placements. */
.imn-pos-top-left .imn-hamburger {
	position: fixed;
	top: 20px;
	left: 20px;
}
.imn-pos-top-right .imn-hamburger {
	position: fixed;
	top: 20px;
	right: 20px;
}

/* ---- Full-screen overlay ---- */
.imn-overlay {
	position: fixed;
	inset: 0;
	z-index: var(--imn-z);
	background: var(--imn-overlay-bg);
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 4rem 1.5rem;
	overflow-y: auto;
	opacity: 0;
	visibility: hidden;
	transition: transform 0.35s ease, opacity 0.3s ease, visibility 0s linear 0.3s;
}

.imn-anim-slide-left .imn-overlay {
	transform: translateX(-100%);
}
.imn-anim-slide-right .imn-overlay {
	transform: translateX(100%);
}
.imn-anim-slide-down .imn-overlay {
	transform: translateY(-100%);
}
.imn-anim-fade .imn-overlay {
	transform: none;
}

.imn-toggle:checked ~ .imn-overlay {
	opacity: 1;
	visibility: visible;
	transform: none;
	transition: transform 0.35s ease, opacity 0.3s ease, visibility 0s;
}

/* Lock background scroll while open. */
html.imn-open,
html.imn-open body {
	overflow: hidden;
}

/* ---- Menu ---- */
.imn-menu {
	width: 100%;
	max-width: 480px;
}
.imn-menu ul {
	list-style: none;
	margin: 0;
	padding: 0;
}
.imn-menu li {
	text-align: center;
}
.imn-menu a {
	color: var(--imn-text);
	text-decoration: none;
	display: inline-block;
	padding: 0.45em 0.25em;
	font-size: 1.4rem;
	line-height: 1.2;
}
.imn-menu a:hover,
.imn-menu a:focus {
	text-decoration: underline;
}

/* Rows that have a submenu: link + toggle button share a row, submenu drops below. */
.imn-menu .menu-item-has-children {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	justify-content: center;
}
.imn-menu .menu-item-has-children > a {
	flex: 0 1 auto;
}
.imn-menu .sub-menu {
	flex: 0 0 100%;
	width: 100%;
	padding-bottom: 0.5em;
}
.imn-menu .sub-menu a {
	font-size: 1.1rem;
	opacity: 0.9;
}

/* ---- Submenu toggle button ---- */
.imn-indicator {
	background: none;
	border: 0;
	padding: 0;
	margin-left: 0.35em;
	color: var(--imn-text);
	cursor: pointer;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 1.8em;
	height: 1.8em;
	flex: 0 0 auto;
	line-height: 0;
}
.imn-indicator svg {
	width: 20px;
	height: 20px;
	display: block;
	transition: transform 0.25s ease;
}
.imn-indicator .imn-vertical {
	transition: opacity 0.2s ease, transform 0.2s ease;
	transform-box: fill-box;
	transform-origin: center;
}

/* Plus -> minus */
.imn-icon-plusminus .menu-item-has-children.is-open .imn-vertical {
	opacity: 0;
	transform: scaleY(0);
}

/* Down arrow -> up arrow */
.imn-icon-chevron .menu-item-has-children.is-open .imn-indicator svg {
	transform: rotate(180deg);
}

@media (prefers-reduced-motion: reduce) {
	.imn-overlay,
	.imn-hamburger .imn-bar,
	.imn-indicator svg,
	.imn-indicator .imn-vertical {
		transition: none !important;
	}
}