/* ==========================================================================
   .leqa-nav — sticky primary navigation (T-B)
   Composes with primitives from main.css (.leqa-container, .leqa-btn, etc.).
   Uses only tokens from tokens.css. State classes (.is-scrolled / .is-open)
   are toggled by main.js.
   ========================================================================== */

.leqa-nav {
	position: sticky;
	top: 0;
	z-index: 100;
	width: 100%;
	border-bottom: var(--leqa-border-width) solid transparent;
	background: color-mix(in srgb, var(--leqa-bg) 72%, transparent);
	-webkit-backdrop-filter: saturate(140%) blur(14px);
	backdrop-filter: saturate(140%) blur(14px);
	transition:
		background var(--leqa-dur) var(--leqa-ease),
		border-color var(--leqa-dur) var(--leqa-ease),
		box-shadow var(--leqa-dur) var(--leqa-ease);
}

/* Condensed state once the page is scrolled. */
.leqa-nav.is-scrolled {
	background: color-mix(in srgb, var(--leqa-bg) 86%, transparent);
	border-bottom-color: var(--leqa-border);
	box-shadow: var(--leqa-shadow-sm);
}

.leqa-nav__inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--leqa-space-4);
	min-height: 68px;
	transition: min-height var(--leqa-dur) var(--leqa-ease);
}

.leqa-nav.is-scrolled .leqa-nav__inner {
	min-height: 58px;
}

/* ---- Brand lockup ---- */
.leqa-nav__brand {
	display: inline-flex;
	align-items: center;
	gap: var(--leqa-space-3);
	text-decoration: none;
	color: var(--leqa-text);
	border-radius: var(--leqa-radius-sm);
	padding: var(--leqa-space-1) var(--leqa-space-2);
	margin-inline-start: calc(var(--leqa-space-2) * -1);
}

.leqa-nav__logo {
	display: inline-flex;
	align-items: center;
}

.leqa-nav__logo-img {
	display: block;
	height: 30px;
	width: auto;
}

/* Logo swaps with theme. Default (dark) shows the dark-bg logo. */
.leqa-nav__logo-img--light { display: none; }
[data-theme="light"] .leqa-nav__logo-img--dark { display: none; }
[data-theme="light"] .leqa-nav__logo-img--light { display: block; }

@media (prefers-color-scheme: light) {
	:root:not([data-theme]) .leqa-nav__logo-img--dark { display: none; }
	:root:not([data-theme]) .leqa-nav__logo-img--light { display: block; }
}

.leqa-nav__wordmark {
	font-family: var(--leqa-font-display);
	font-weight: var(--leqa-weight-semibold);
	font-size: 1.18rem;
	letter-spacing: var(--leqa-tracking-tight);
	line-height: 1;
}

/* ---- Menu group ---- */
.leqa-nav__menu {
	display: flex;
	align-items: center;
	gap: var(--leqa-space-6);
}

.leqa-nav__links {
	display: flex;
	align-items: center;
	gap: var(--leqa-space-2);
	margin: 0;
	padding: 0;
	list-style: none;
}

.leqa-nav__item { margin: 0; }

.leqa-nav__link {
	display: inline-flex;
	align-items: center;
	min-height: 40px;
	padding: var(--leqa-space-2) var(--leqa-space-3);
	border-radius: var(--leqa-radius-sm);
	color: var(--leqa-text-muted);
	font-size: var(--leqa-fs-small);
	font-weight: var(--leqa-weight-medium);
	text-decoration: none;
	transition:
		color var(--leqa-dur-fast) var(--leqa-ease),
		background var(--leqa-dur-fast) var(--leqa-ease);
}

.leqa-nav__link:hover,
.leqa-nav__link:focus-visible {
	color: var(--leqa-text);
	background: var(--leqa-accent-soft);
}

.leqa-nav__actions {
	display: flex;
	align-items: center;
	gap: var(--leqa-space-3);
}

/* ---- Theme toggle ---- */
.leqa-nav__theme {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 40px;
	height: 40px;
	padding: 0;
	border: var(--leqa-border-width) solid var(--leqa-border);
	border-radius: var(--leqa-radius-pill);
	background: var(--leqa-bg-elev);
	color: var(--leqa-text-muted);
	cursor: pointer;
	transition:
		color var(--leqa-dur-fast) var(--leqa-ease),
		border-color var(--leqa-dur-fast) var(--leqa-ease),
		background var(--leqa-dur-fast) var(--leqa-ease);
}

.leqa-nav__theme:hover,
.leqa-nav__theme:focus-visible {
	color: var(--leqa-accent);
	border-color: var(--leqa-border-strong);
}

.leqa-nav__theme-icon { display: none; }
/* Dark theme shows the sun (offer to switch to light). */
.leqa-nav__theme-icon--sun { display: block; }
.leqa-nav__theme-icon--moon { display: none; }
[data-theme="light"] .leqa-nav__theme-icon--sun { display: none; }
[data-theme="light"] .leqa-nav__theme-icon--moon { display: block; }

@media (prefers-color-scheme: light) {
	:root:not([data-theme]) .leqa-nav__theme-icon--sun { display: none; }
	:root:not([data-theme]) .leqa-nav__theme-icon--moon { display: block; }
}

/* ---- Mobile toggle (hamburger) ---- */
.leqa-nav__toggle {
	display: none;
	align-items: center;
	justify-content: center;
	width: 44px;
	height: 44px;
	padding: 0;
	border: var(--leqa-border-width) solid var(--leqa-border);
	border-radius: var(--leqa-radius-sm);
	background: var(--leqa-bg-elev);
	color: var(--leqa-text);
	cursor: pointer;
}

.leqa-nav__burger {
	position: relative;
	display: block;
	width: 20px;
	height: 14px;
}

.leqa-nav__burger span {
	position: absolute;
	left: 0;
	width: 100%;
	height: 2px;
	border-radius: 2px;
	background: currentColor;
	transition: transform var(--leqa-dur) var(--leqa-ease), opacity var(--leqa-dur-fast) var(--leqa-ease);
}

.leqa-nav__burger span:nth-child(1) { top: 0; }
.leqa-nav__burger span:nth-child(2) { top: 6px; }
.leqa-nav__burger span:nth-child(3) { top: 12px; }

/* Open state: morph burger into an X. */
.leqa-nav__toggle[aria-expanded="true"] .leqa-nav__burger span:nth-child(1) {
	transform: translateY(6px) rotate(45deg);
}
.leqa-nav__toggle[aria-expanded="true"] .leqa-nav__burger span:nth-child(2) {
	opacity: 0;
}
.leqa-nav__toggle[aria-expanded="true"] .leqa-nav__burger span:nth-child(3) {
	transform: translateY(-6px) rotate(-45deg);
}

/* ==========================================================================
   Mobile layout — collapse the menu behind the toggle.
   ========================================================================== */
@media (max-width: 820px) {
	.leqa-nav__toggle { display: inline-flex; }

	.leqa-nav__menu {
		position: fixed;
		inset: 68px var(--leqa-gutter) auto;
		flex-direction: column;
		align-items: stretch;
		gap: var(--leqa-space-5);
		padding: var(--leqa-space-6);
		border: var(--leqa-border-width) solid var(--leqa-border);
		border-radius: var(--leqa-radius-lg);
		background: var(--leqa-bg-elev);
		box-shadow: var(--leqa-shadow-lg);
		opacity: 0;
		transform: translateY(-8px) scale(0.99);
		transform-origin: top right;
		pointer-events: none;
		visibility: hidden;
		transition:
			opacity var(--leqa-dur) var(--leqa-ease),
			transform var(--leqa-dur) var(--leqa-ease),
			visibility var(--leqa-dur) var(--leqa-ease);
	}

	.leqa-nav__menu.is-open {
		opacity: 1;
		transform: translateY(0) scale(1);
		pointer-events: auto;
		visibility: visible;
	}

	.leqa-nav__links {
		flex-direction: column;
		align-items: stretch;
		gap: var(--leqa-space-1);
	}

	.leqa-nav__link {
		min-height: 48px;
		font-size: var(--leqa-fs-body);
		padding-inline: var(--leqa-space-4);
	}

	.leqa-nav__actions {
		justify-content: space-between;
		padding-top: var(--leqa-space-4);
		border-top: var(--leqa-border-width) solid var(--leqa-border);
	}

	.leqa-nav__cta { flex: 1; justify-content: center; }
}

/* ==========================================================================
   Reduced motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
	.leqa-nav,
	.leqa-nav__inner,
	.leqa-nav__menu,
	.leqa-nav__burger span {
		transition: none;
	}
}