/**
 * Variant CSS: nav--transparent-minimal-hamburger
 * Layer 2 — ultra-minimal transparent overlay header: only the brand + a labelled
 * "Menu" toggle; the menu + CTA live behind the toggle as a dark drop panel AT EVERY
 * width (desktop included). Light on-dark text, no bar fill, maximum photo real-estate.
 * Two modes: isolated (relative + dark-band fallback) and overlay (.aibt-header-overlay
 * → floats absolute on the hero). Scope: every selector starts with
 * body.aibt-universal .universal-nav--transparent-minimal-hamburger
 */

body.aibt-universal .universal-nav--transparent-minimal-hamburger {
	position: relative;
	z-index: 100;
	background: transparent;
	border-bottom: 1px solid rgba(255, 255, 255, 0.16);
	padding-block: 0 !important;
	margin-block: 0 !important;
	background-image: linear-gradient(
		180deg,
		var(--background-dark) 0%,
		color-mix(in oklab, var(--background-dark) 80%, transparent) 100%
	);
}

body.aibt-universal .universal-nav--transparent-minimal-hamburger .universal-nav__inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--space-md);
	padding: 1.3rem clamp(var(--space-md), 4vw, var(--space-xl));
	max-width: var(--max-ultra);
	margin-inline: auto;
}

body.aibt-universal .universal-nav--transparent-minimal-hamburger .universal-nav__brand {
	font-family: var(--font-display) !important;
	font-weight: 500 !important;
	font-size: 1.4rem !important;
	letter-spacing: -0.01em !important;
	color: var(--text-on-dark, #ffffff) !important;
	margin: 0 !important;
	line-height: 1 !important;
	white-space: nowrap;
}

/* Always-visible toggle: "Menu" label + two bars that morph to an X when open */
body.aibt-universal .universal-nav--transparent-minimal-hamburger .universal-nav__toggle {
	display: inline-flex;
	align-items: center;
	gap: 0.65rem;
	background: transparent;
	border: 0;
	cursor: pointer;
	padding: 0.4rem 0.2rem;
	font-family: var(--font-body);
	transition: opacity var(--duration-fast) var(--ease-default);
}

body.aibt-universal .universal-nav--transparent-minimal-hamburger .universal-nav__toggle:hover {
	opacity: 0.78;
}

body.aibt-universal .universal-nav--transparent-minimal-hamburger .universal-nav__toggle-label {
	font-size: var(--text-sm);
	font-weight: 500;
	letter-spacing: var(--tracking-wider);
	text-transform: uppercase;
	color: var(--text-on-dark, #ffffff);
}

body.aibt-universal .universal-nav--transparent-minimal-hamburger .universal-nav__toggle-bars {
	display: flex;
	flex-direction: column;
	gap: 5px;
	width: 22px;
}

body.aibt-universal .universal-nav--transparent-minimal-hamburger .universal-nav__toggle-bar {
	display: block;
	width: 22px;
	height: 1.5px;
	background: var(--text-on-dark, #ffffff);
	transition: transform 280ms var(--ease-default);
}

body.aibt-universal .universal-nav--transparent-minimal-hamburger .universal-nav__toggle[aria-expanded="true"] .universal-nav__toggle-bar:nth-child(1) {
	transform: translateY(3.25px) rotate(45deg);
}

body.aibt-universal .universal-nav--transparent-minimal-hamburger .universal-nav__toggle[aria-expanded="true"] .universal-nav__toggle-bar:nth-child(2) {
	transform: translateY(-3.25px) rotate(-45deg);
}

/* Drop panel — at ALL widths. Slides down from under the bar on toggle. */
body.aibt-universal .universal-nav--transparent-minimal-hamburger .universal-nav__menu-wrap {
	position: fixed;
	top: 74px;
	left: 0;
	right: 0;
	background: var(--background-dark);
	display: flex;
	flex-direction: column;
	gap: 2.25rem;
	align-items: center;
	justify-content: center;
	padding: 3.5rem 1.5rem 3rem;
	transform: translateY(-115%);
	transition: transform 360ms var(--ease-default);
	z-index: 99;
	box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}

body.aibt-universal .universal-nav--transparent-minimal-hamburger .universal-nav__menu-wrap[data-open="true"] {
	transform: translateY(0);
}

body.aibt-universal .universal-nav--transparent-minimal-hamburger .universal-nav__menu {
	font-family: var(--font-display) !important;
	font-size: clamp(1.5rem, 3.5vw, 2.25rem) !important;
	color: var(--text-on-dark, #ffffff) !important;
	margin: 0 !important;
	letter-spacing: -0.01em !important;
	line-height: 1.7;
	text-align: center;
	white-space: normal;
}

body.aibt-universal .universal-nav--transparent-minimal-hamburger .universal-nav__menu a {
	color: inherit;
	text-decoration: none;
	transition: color var(--duration-fast) var(--ease-default);
}

body.aibt-universal .universal-nav--transparent-minimal-hamburger .universal-nav__menu a:hover {
	color: var(--accent);
}

/* CTA — ghost outline, sized up to match the editorial panel */
body.aibt-universal .universal-nav--transparent-minimal-hamburger .universal-nav__cta {
	font-family: var(--font-body);
	font-size: 0.92rem;
	font-weight: 500;
	letter-spacing: var(--tracking-wide);
	padding: 0.85rem 2.4rem;
	color: var(--text-on-dark, #ffffff);
	background: transparent;
	border: 1px solid rgba(255, 255, 255, 0.55);
	text-decoration: none;
	transition: background var(--duration-fast) var(--ease-default),
		border-color var(--duration-fast) var(--ease-default),
		color var(--duration-fast) var(--ease-default);
	min-height: 44px;
	display: inline-flex;
	align-items: center;
	white-space: nowrap;
	border-radius: var(--decor-radius);
}

body.aibt-universal .universal-nav--transparent-minimal-hamburger .universal-nav__cta:hover {
	background: var(--accent);
	border-color: var(--accent);
	color: var(--cta-text-primary);
}

/* Keyboard focus rings (a11y) */
body.aibt-universal .universal-nav--transparent-minimal-hamburger .universal-nav__menu a:focus-visible,
body.aibt-universal .universal-nav--transparent-minimal-hamburger .universal-nav__cta:focus-visible,
body.aibt-universal .universal-nav--transparent-minimal-hamburger .universal-nav__toggle:focus-visible {
	outline: 2px solid var(--text-on-dark, #ffffff);
	outline-offset: 3px;
	border-radius: var(--decor-radius);
}

/* The CTA sits at a comfortable hit size already; the panel layout is the same at
   every breakpoint, so no separate mobile block is needed beyond fluid sizing. */

/* ── Overlay mode (transparent-header architecture) ── */
body.aibt-universal .aibt-header-overlay {
	position: relative;
}

body.aibt-universal .aibt-header-overlay .universal-nav--transparent-minimal-hamburger {
	position: absolute;
	inset: 0 0 auto 0;
	z-index: 50;
	background: transparent;
	background-image: linear-gradient(
		180deg,
		rgba(0, 0, 0, 0.44) 0%,
		rgba(0, 0, 0, 0.16) 60%,
		rgba(0, 0, 0, 0) 100%
	);
	text-shadow: 0 1px 3px rgba(0, 0, 0, 0.55);
}

body.aibt-universal .aibt-header-overlay .universal-hero {
	padding-top: var(--header-h, 4.75rem);
}

body.aibt-universal .aibt-header-overlay .universal-hero[class*="universal-hero--cover-"] {
	padding-top: 0;
}