/* Header + navigation */

.site-header {
	position: sticky;
	top: 0;
	z-index: 100;
	background: rgba(255, 255, 255, 0.96);
	-webkit-backdrop-filter: saturate(140%) blur(8px);
	backdrop-filter: saturate(140%) blur(8px);
	border-bottom: 1px solid var(--zgb-line);
	transition: box-shadow var(--zgb-dur-fast) var(--zgb-ease-out), background var(--zgb-dur-fast);
}
.site-header.is-stuck {
	box-shadow: var(--zgb-shadow-soft);
	background: rgba(255, 255, 255, 0.92);
}

.site-header__inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--zgb-space-5);
	min-height: var(--zgb-header-h);
	transition: min-height var(--zgb-dur-fast) var(--zgb-ease-out);
}
.site-header.is-stuck .site-header__inner { min-height: 60px; }

.site-logo__img, .custom-logo { height: 25px; width: auto; transition: height var(--zgb-dur-fast) var(--zgb-ease-out); }
.site-header.is-stuck .site-logo__img, .site-header.is-stuck .custom-logo { height: 22px; }

/* Desktop nav */
.main-navigation .menu {
	display: flex;
	gap: clamp(1.75rem, 3.5vw, 3.5rem);
	list-style: none;
	margin: 0;
	padding: 0;
	align-items: center;
}
.main-navigation a {
	font-family: var(--zgb-font-head);
	font-weight: 500;
	color: var(--zgb-ink);
	padding: 0.5rem 0;
	position: relative;
}
.main-navigation a::after {
	content: "";
	position: absolute;
	left: 0; bottom: 0;
	width: 0; height: 2px;
	background: var(--zgb-green); /* identity = green; action accents = blue */
	transition: width var(--zgb-dur-fast) var(--zgb-ease-out);
}
.main-navigation a:hover::after,
.main-navigation .current-menu-item > a::after,
.main-navigation .current-menu-ancestor > a::after { width: 100%; }
/* Submenu links use their own affordance, not the underline animation. */
.main-navigation .sub-menu a::after { display: none; }

/* --- Disclosure submenu: toggle button + chevron --- */
.main-navigation .menu > li.menu-item-has-children { position: relative; }
.main-navigation .menu-item-has-children > .menu__link { display: inline-block; }
.submenu-toggle {
	display: inline-flex; align-items: center; justify-content: center;
	background: none; border: 0; padding: 0 0.25rem; margin-left: 0.15rem;
	cursor: pointer; color: var(--zgb-ink); line-height: 1; vertical-align: middle;
}
.submenu-toggle__icon {
	width: 0; height: 0; display: inline-block;
	border-left: 5px solid transparent; border-right: 5px solid transparent;
	border-top: 6px solid currentColor;
	transition: transform var(--zgb-transition);
}
.submenu-toggle[aria-expanded="true"] .submenu-toggle__icon { transform: rotate(180deg); }
.submenu-toggle:focus-visible { outline: 2px solid var(--zgb-primary); outline-offset: 2px; border-radius: var(--zgb-radius-sm); }

/* --- Desktop submenu popup (applies >=992px; nav is hidden below that) --- */
.main-navigation .sub-menu {
	position: absolute; top: 100%; left: 0; min-width: 220px;
	list-style: none; margin: 0; padding: var(--zgb-space-2);
	background: #fff; box-shadow: var(--zgb-shadow);
	border: 1px solid var(--zgb-line); border-radius: var(--zgb-radius-sm);
	z-index: 101;
	opacity: 0; visibility: hidden; transform: translateY(6px);
	transition: opacity var(--zgb-transition), transform var(--zgb-transition), visibility var(--zgb-transition);
}
.main-navigation .sub-menu.is-open { opacity: 1; visibility: visible; transform: none; }
.main-navigation .sub-menu a { display: block; padding: 0.5rem 0.6rem; border-radius: var(--zgb-radius-sm); white-space: nowrap; color: var(--zgb-ink); }
.main-navigation .sub-menu a:hover,
.main-navigation .sub-menu .current-menu-item > a { background: var(--zgb-bg-alt); color: var(--zgb-primary-dark); }

/* Burger */
.menu-toggle {
	display: none;
	background: none;
	border: 0;
	padding: 0.5rem;
	cursor: pointer;
}
.menu-toggle__bars { display: inline-block; width: 26px; height: 18px; position: relative; }
.menu-toggle__bars span {
	position: absolute; left: 0; width: 100%; height: 2px;
	background: var(--zgb-ink); border-radius: 2px;
	transition: transform var(--zgb-transition), opacity var(--zgb-transition);
}
.menu-toggle__bars span:nth-child(1) { top: 0; }
.menu-toggle__bars span:nth-child(2) { top: 8px; }
.menu-toggle__bars span:nth-child(3) { top: 16px; }
.menu-toggle[aria-expanded="true"] .menu-toggle__bars span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] .menu-toggle__bars span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] .menu-toggle__bars span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* Off-canvas mobile nav */
.mobile-nav {
	position: fixed;
	inset: var(--zgb-header-h) 0 0 auto;
	width: min(320px, 85vw);
	background: #fff;
	box-shadow: var(--zgb-shadow-lg);
	transform: translateX(100%);
	transition: transform var(--zgb-transition);
	z-index: 99;
	padding: var(--zgb-space-5);
	overflow-y: auto;
}
.mobile-nav.is-open { transform: translateX(0); }
.mobile-menu__list { list-style: none; margin: 0; padding: 0; }
.mobile-menu__list li { border-bottom: 1px solid var(--zgb-line); }
.mobile-menu__list a { display: block; padding: 0.9rem 0; font-family: var(--zgb-font-head); font-weight: 500; color: var(--zgb-ink); }

body.zgb-nav-open { overflow: hidden; }
.zgb-nav-scrim {
	position: fixed; inset: var(--zgb-header-h) 0 0 0;
	background: rgba(0,0,0,0.35); z-index: 98;
	opacity: 0; pointer-events: none; transition: opacity var(--zgb-transition);
}
.zgb-nav-scrim.is-open { opacity: 1; pointer-events: auto; }

@media (max-width: 992px) {
	.main-navigation { display: none; }
	.menu-toggle { display: inline-flex; align-items: center; }

	/* Mobile off-canvas submenu = in-flow max-height accordion */
	.mobile-menu__list .menu-item-has-children {
		display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
	}
	.mobile-menu__list .menu-item-has-children > .menu__link { flex: 1 1 auto; display: inline-block; }
	.mobile-menu__list .submenu-toggle { flex: 0 0 auto; padding: 0.9rem 0.5rem; margin-left: 0.25rem; color: var(--zgb-ink); }
	.mobile-menu__list .sub-menu {
		flex-basis: 100%; list-style: none; margin: 0; padding: 0 0 0 var(--zgb-space-4);
		max-height: 0; overflow: hidden;
		transition: max-height var(--zgb-transition);
	}
	.mobile-menu__list .sub-menu.is-open { max-height: 60vh; }
	.mobile-menu__list .sub-menu a { display: block; padding: 0.7rem 0; color: var(--zgb-ink); }
}

@media (prefers-reduced-motion: reduce) {
	.main-navigation .sub-menu,
	.mobile-menu__list .sub-menu,
	.submenu-toggle__icon { transition: none; }
}