*,
*::before,
*::after {
	box-sizing: border-box;
}

:host {
	display: block;
	container-type: inline-size;
	container-name: app-bar;
	z-index: 1000;
}

.app-bar {
	background-color: var(--g-color-background-default);
	border-block-end: 1px solid var(--g-color-border-default);
	position: relative;
}

:host([sticky]),
.app-bar--sticky {
	position: sticky;
	inset-block-start: 0;
}

.app-bar--transparent {
	background-color: transparent;
	border-block-end-color: transparent;
	box-shadow: none;
}

/* Top bar row — always visible */
.app-bar__bar {
	display: flex;
	align-items: center;
	gap: var(--g-spacing-lg);
	padding-inline: var(--g-spacing-md);
	padding-block: var(--g-spacing-md);
	max-inline-size: 1400px;
	margin-inline: auto;
}

/* Logo */
.app-bar__logo {
	display: flex;
	align-items: center;
	flex-shrink: 0;
}

/* Navigation — hidden on mobile, shown on desktop */
.app-bar__nav {
	display: none;
}

/* Actions */
.app-bar__actions {
	display: flex;
	align-items: center;
	gap: var(--g-spacing-sm);
	margin-inline-start: auto;
}

/* Mobile Menu Button */
.app-bar__menu-button {
	all: unset;
	display: flex;
	align-items: center;
	justify-content: center;
	inline-size: 2.75rem;
	block-size: 2.75rem;
	padding: var(--g-spacing-sm);
	border-radius: var(--g-border-radius-md);
	cursor: pointer;
	color: var(--g-color-content-default);
	transition: background-color 0.2s ease;
}

.app-bar__menu-button:hover {
	background-color: var(--g-color-background-subtle-hover);
}

/* Hamburger Icon */
.app-bar__menu-icon {
	display: block;
	inline-size: 1.25rem;
	block-size: 1rem;
	position: relative;
}

.app-bar__menu-icon::before,
.app-bar__menu-icon::after {
	content: "";
	position: absolute;
	inline-size: 100%;
	block-size: 2px;
	inset-inline-start: 0;
	background-color: currentColor;
	transition:
		transform 0.2s ease,
		inset 0.2s ease;
}

.app-bar__menu-icon::before {
	inset-block-start: 0;
	box-shadow: 0 0.4375rem 0 currentColor;
}

.app-bar__menu-icon::after {
	inset-block-end: 0;
}

/* Animated hamburger to X */
.app-bar__menu-button[aria-expanded="true"] .app-bar__menu-icon::before {
	inset-block-start: calc(50% - 1px);
	transform: rotate(45deg);
	box-shadow: none;
}

.app-bar__menu-button[aria-expanded="true"] .app-bar__menu-icon::after {
	inset-block-end: calc(50% - 1px);
	transform: rotate(-45deg);
}

/*
   * Mobile menu — full-width panel below the app bar.
   * Uses clip-path for a clean slide-down reveal animation.
   */
.app-bar__nav--open {
	display: flex;
	flex-direction: column;
	gap: var(--g-spacing-xs, 0.25rem);
	position: absolute;
	inset-inline: 0;
	inset-block-start: 100%;
	z-index: 99;
	background-color: var(--g-color-background-default);
	border-block-end: 1px solid var(--g-color-border-default);
	padding-block: var(--g-spacing-md);
	padding-inline: var(--g-spacing-md);
	box-shadow: var(--g-box-shadow-lg, 0 8px 24px rgba(0, 0, 0, 0.12));
	animation: menu-open 0.25s ease-out;
}

@keyframes menu-open {
	from {
		opacity: 0;
		transform: translateY(-0.5rem);
	}
	to {
		opacity: 1;
		transform: translateY(0);
	}
}

/* Slotted nav content stacks vertically in mobile menu */
.app-bar__nav--open ::slotted(ul),
.app-bar__nav--open ::slotted(div[slot="nav"]) {
	display: flex;
	flex-direction: column;
	gap: var(--g-spacing-xs, 0.25rem);
	margin: 0;
	padding: 0;
	list-style: none;
}

/* Backdrop overlay — covers viewport below app bar when menu is open */
.app-bar__overlay {
	display: none;
}

.app-bar__overlay--visible {
	display: block;
	position: fixed;
	inset: 0;
	z-index: 98;
	background-color: rgba(0, 0, 0, 0.2);
	animation: overlay-fade 0.2s ease-out;
}

@keyframes overlay-fade {
	from {
		opacity: 0;
	}
	to {
		opacity: 1;
	}
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
	.app-bar__menu-icon::before,
	.app-bar__menu-icon::after {
		transition: none;
	}

	.app-bar__menu-button {
		transition: none;
	}

	.app-bar__nav--open {
		animation: none;
	}

	.app-bar__overlay--visible {
		animation: none;
	}
}

/* Desktop: show nav inline, hide hamburger */
@container app-bar (min-width: 768px) {
	.app-bar__nav {
		display: flex;
		flex-direction: row;
		align-items: center;
		gap: var(--g-spacing-xs, 0.25rem);
		flex: 1;
		min-inline-size: 0;
		overflow-x: auto;
		flex-wrap: nowrap;
		-webkit-overflow-scrolling: touch;
		-webkit-mask-image: linear-gradient(
			to right,
			black calc(100% - 1.5rem),
			transparent
		);
		mask-image: linear-gradient(
			to right,
			black calc(100% - 1.5rem),
			transparent
		);
		scrollbar-width: thin;
		scrollbar-color: var(--g-color-border-default) transparent;
	}

	.app-bar__nav::-webkit-scrollbar {
		height: 4px;
	}

	.app-bar__nav::-webkit-scrollbar-track {
		background: transparent;
	}

	.app-bar__nav::-webkit-scrollbar-thumb {
		background: var(--g-color-border-default);
		border-radius: 2px;
	}

	/* Reset mobile-open styles at desktop — nav is always inline */
	.app-bar__nav--open {
		position: static;
		background-color: transparent;
		border: 0;
		padding: 0;
		box-shadow: none;
		animation: none;
		flex-direction: row;
		overflow-x: auto;
		-webkit-mask-image: linear-gradient(
			to right,
			black calc(100% - 1.5rem),
			transparent
		);
		mask-image: linear-gradient(
			to right,
			black calc(100% - 1.5rem),
			transparent
		);
	}

	.app-bar__actions {
		order: 3;
		flex-shrink: 0;
	}

	.app-bar__menu-button {
		display: none;
	}

	/* Overlay is never visible on desktop */
	.app-bar__overlay--visible {
		display: none;
	}

	::slotted(ul),
	::slotted(div[slot="nav"]) {
		flex-shrink: 0;
	}
}

/* Slotted content styling */
::slotted(a[slot="logo"]) {
	color: var(--g-color-content-default) !important;
	text-decoration: none !important;
	font: var(--g-typography-body-sm-font);
}

::slotted(ul),
::slotted(div[slot="nav"]) {
	display: flex;
	flex-direction: row;
	gap: var(--g-spacing-xs, 0.25rem);
	margin: 0;
	padding: 0;
	list-style: none;
}