/* Premium Navigation System — Milestone 17 */
:root {
	--cx-nav-bg: var(--cx-card, #fff);
	--cx-nav-text: var(--cx-text, #0f172a);
	--cx-nav-accent: var(--cx-primary, #6366f1);
	--cx-nav-h: 60px;
	--cx-nav-h-shrink: 52px;
	--cx-nav-bottom-h: 56px;
	--cx-nav-z: 9000;
}

/* Spacer to prevent layout shift when sticky */
body.cx-nav-active.cx-nav-sticky { padding-top: var(--cx-nav-h); }
body.cx-nav-active.cx-nav-sticky.cx-nav-is-shrink { padding-top: var(--cx-nav-h-shrink); }
body.cx-nav-active.cx-nav-bottom-bar { padding-bottom: calc(var(--cx-nav-bottom-h) + env(safe-area-inset-bottom, 0px)); }
body.cx-nav-active.cx-nav-fab.cx-nav-bottom-bar { padding-bottom: calc(var(--cx-nav-bottom-h) + 56px + env(safe-area-inset-bottom, 0px)); }

/* Header */
.cx-nav-header {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	z-index: var(--cx-nav-z);
	height: var(--cx-nav-h);
	background: var(--cx-nav-bg);
	border-bottom: 1px solid var(--cx-border, #e2e8f0);
	box-shadow: 0 1px 3px rgba(0,0,0,.04);
	transition: transform .28s ease, height .28s ease, box-shadow .28s ease;
	will-change: transform;
}
.cx-nav-header.cx-nav-hidden { transform: translateY(-100%); }
.cx-nav-header.cx-nav-shrink { height: var(--cx-nav-h-shrink); box-shadow: 0 2px 8px rgba(0,0,0,.08); }

.cx-nav-inner {
	max-width: 1280px;
	margin: 0 auto;
	height: 100%;
	display: flex;
	align-items: center;
	gap: 12px;
	padding: 0 16px;
}

.cx-nav-logo {
	display: flex;
	align-items: center;
	gap: 8px;
	text-decoration: none;
	color: var(--cx-nav-text);
	font-weight: 800;
	font-size: 15px;
	flex-shrink: 0;
}
.cx-nav-logo-img { display: block; }
.cx-nav-logo-text { display: none; }
@media (min-width:768px) { .cx-nav-logo-text { display: inline; } }

.cx-nav-search-trigger {
	display: flex;
	align-items: center;
	gap: 6px;
	flex: 1;
	max-width: 280px;
	padding: 8px 12px;
	border: 1px solid var(--cx-border, #e2e8f0);
	border-radius: 100px;
	background: var(--cx-bg, #f8fafc);
	color: var(--cx-g500, #64748b);
	cursor: pointer;
	font-size: 13px;
	transition: border-color .15s, box-shadow .15s;
}
.cx-nav-search-trigger:hover { border-color: var(--cx-nav-accent); }
.cx-nav-search-trigger:focus-visible { outline: 2px solid var(--cx-nav-accent); outline-offset: 2px; }
.cx-nav-search-label {
	flex: 1;
	text-align: left;
	white-space: nowrap;
	overflow: hidden;
	text-overflow: ellipsis;
}
.cx-nav-search-hint {
	margin-left: auto;
	font-size: 11px;
	padding: 2px 6px;
	border-radius: 4px;
	background: var(--cx-g100, #f1f5f9);
	color: var(--cx-g500, #64748b);
}
@media (max-width: 479px) {
	.cx-nav-search-label { display: none; }
	.cx-nav-search-trigger { max-width: 44px; justify-content: center; padding: 8px; }
	.cx-nav-search-hint { display: none; }
}
@media (min-width: 1024px) {
	.cx-nav-search-trigger { max-width: 360px; }
}

.cx-nav-mega-seg {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 24px;
	height: 24px;
	font-size: 14px;
	flex-shrink: 0;
}
.cx-nav-mega-list--segments .cx-nav-mega-link { gap: 10px; }

.cx-nav-desktop { display: none; flex: 1; overflow: hidden; }
@media (min-width:1024px) { .cx-nav-desktop { display: block; } }

.cx-nav-list {
	display: flex;
	align-items: center;
	gap: 2px;
	list-style: none;
	margin: 0;
	padding: 0;
	overflow-x: auto;
	scrollbar-width: none;
}
.cx-nav-list::-webkit-scrollbar { display: none; }

.cx-nav-link,
.cx-nav-mega-trigger {
	display: inline-flex;
	align-items: center;
	gap: 4px;
	padding: 8px 10px;
	border: none;
	background: none;
	border-radius: 8px;
	color: var(--cx-nav-text);
	text-decoration: none;
	font-size: 13px;
	font-weight: 600;
	cursor: pointer;
	white-space: nowrap;
	transition: background .15s, color .15s;
}
.cx-nav-link:hover,
.cx-nav-mega-trigger:hover,
.cx-nav-link:focus-visible,
.cx-nav-mega-trigger:focus-visible {
	background: var(--cx-g100, #f1f5f9);
	color: var(--cx-nav-accent);
	outline: none;
}
.cx-nav-link svg,
.cx-nav-mega-trigger svg { width: 16px; height: 16px; opacity: .7; }

.cx-nav-badge {
	font-size: 10px;
	font-weight: 800;
	background: var(--cx-nav-accent);
	color: #fff;
	padding: 1px 6px;
	border-radius: 100px;
	min-width: 18px;
	text-align: center;
}

.cx-nav-actions {
	display: flex;
	align-items: center;
	gap: 6px;
	margin-left: auto;
	flex-shrink: 0;
}

.cx-nav-theme-btn,
.cx-nav-user-btn {
	display: flex;
	align-items: center;
	justify-content: center;
	width: 36px;
	height: 36px;
	border: 1px solid var(--cx-border, #e2e8f0);
	border-radius: 10px;
	background: var(--cx-nav-bg);
	color: var(--cx-nav-text);
	cursor: pointer;
	transition: background .15s, border-color .15s;
}
.cx-nav-theme-btn:hover,
.cx-nav-user-btn:hover { border-color: var(--cx-nav-accent); color: var(--cx-nav-accent); }
.cx-nav-theme-btn:focus-visible,
.cx-nav-user-btn:focus-visible { outline: 2px solid var(--cx-nav-accent); outline-offset: 2px; }
.cx-nav-icon-moon { display: none; }
[data-theme="dark"] .cx-nav-icon-sun { display: none; }
[data-theme="dark"] .cx-nav-icon-moon { display: block; }

.cx-nav-lang-wrap .cx-lang-switcher--header { margin: 0; }
.cx-nav-lang-wrap .cx-lang-select { font-size: 12px; padding: 6px 8px; border-radius: 8px; border: 1px solid var(--cx-border, #e2e8f0); }

/* Mega menu */
.cx-nav-mega {
	position: fixed;
	inset: 0;
	z-index: calc(var(--cx-nav-z) + 1);
	background: rgba(15,23,42,.4);
	backdrop-filter: blur(4px);
	-webkit-backdrop-filter: blur(4px);
}
.cx-nav-mega[hidden] { display: none; }
.cx-nav-mega-panel {
	position: absolute;
	top: var(--cx-nav-h);
	left: 50%;
	transform: translateX(-50%);
	width: min(960px, calc(100vw - 32px));
	max-height: calc(100vh - var(--cx-nav-h) - 32px);
	overflow-y: auto;
	background: var(--cx-nav-bg);
	border-radius: 16px;
	box-shadow: 0 20px 60px rgba(0,0,0,.15);
	padding: 20px;
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
	gap: 20px;
}
.cx-nav-mega-col h3, .cx-nav-mega-col h4 { font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: .04em; color: var(--cx-g500, #64748b); margin: 0 0 10px; }
.cx-nav-mega-col h4 { margin-top: 14px; font-size: 11px; }
.cx-nav-mega-list, .cx-nav-mega-products { list-style: none; margin: 0; padding: 0; }
.cx-nav-mega-link, .cx-nav-mega-product {
	display: flex;
	align-items: center;
	gap: 8px;
	padding: 6px 0;
	color: var(--cx-nav-text);
	text-decoration: none;
	font-size: 13px;
	font-weight: 600;
}
.cx-nav-mega-link:hover, .cx-nav-mega-product:hover { color: var(--cx-nav-accent); }
.cx-nav-mega-link img, .cx-nav-mega-product img { border-radius: 6px; object-fit: contain; background: var(--cx-bg, #f8fafc); }
.cx-nav-mega-more { font-size: 12px; font-weight: 700; color: var(--cx-nav-accent); text-decoration: none; display: inline-block; margin-top: 8px; }

/* Search overlay */
.cx-nav-search-overlay {
	position: fixed;
	inset: 0;
	z-index: calc(var(--cx-nav-z) + 2);
	background: rgba(15,23,42,.5);
	backdrop-filter: blur(6px);
	-webkit-backdrop-filter: blur(6px);
	display: flex;
	align-items: flex-start;
	justify-content: center;
	padding-top: calc(var(--cx-nav-h) + 20px);
}
.cx-nav-search-overlay[hidden] { display: none; }
.cx-nav-search-panel {
	width: min(560px, calc(100vw - 32px));
	background: var(--cx-nav-bg);
	border-radius: 16px;
	box-shadow: 0 20px 60px rgba(0,0,0,.2);
	overflow: hidden;
}
.cx-nav-search-form {
	display: flex;
	align-items: center;
	gap: 10px;
	padding: 14px 16px;
	border-bottom: 1px solid var(--cx-border, #e2e8f0);
}
.cx-nav-search-input {
	flex: 1;
	border: none;
	background: none;
	font-size: 16px;
	color: var(--cx-nav-text);
	outline: none;
}
.cx-nav-search-close {
	border: none;
	background: none;
	font-size: 24px;
	line-height: 1;
	cursor: pointer;
	color: var(--cx-g500, #64748b);
	padding: 4px;
	border-radius: 6px;
}
.cx-nav-search-close:focus-visible { outline: 2px solid var(--cx-nav-accent); }
.cx-nav-search-results { list-style: none; margin: 0; padding: 8px; max-height: 360px; overflow-y: auto; }
.cx-nav-search-results li a {
	display: flex;
	align-items: center;
	gap: 10px;
	padding: 10px 12px;
	border-radius: 10px;
	text-decoration: none;
	color: var(--cx-nav-text);
	font-size: 14px;
	font-weight: 600;
}
.cx-nav-search-results li a:hover,
.cx-nav-search-results li a:focus { background: var(--cx-g100, #f1f5f9); outline: none; }
.cx-nav-search-results img { width: 36px; height: 36px; border-radius: 8px; object-fit: cover; }

/* Quick actions panel */
.cx-nav-quick-actions {
	position: fixed;
	inset: 0;
	z-index: calc(var(--cx-nav-z) + 2);
	background: rgba(15,23,42,.4);
}
.cx-nav-quick-actions[hidden] { display: none; }
.cx-nav-qa-panel {
	position: absolute;
	right: 0;
	top: 0;
	bottom: 0;
	width: min(320px, 100vw);
	background: var(--cx-nav-bg);
	box-shadow: -4px 0 24px rgba(0,0,0,.1);
	display: flex;
	flex-direction: column;
	padding-bottom: env(safe-area-inset-bottom, 0px);
}
@media (max-width:767px) {
	.cx-nav-qa-panel { width: 100%; top: auto; height: 70vh; border-radius: 20px 20px 0 0; }
}
.cx-nav-qa-head {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 16px 20px;
	border-bottom: 1px solid var(--cx-border, #e2e8f0);
}
.cx-nav-qa-head h2 { margin: 0; font-size: 16px; font-weight: 800; }
.cx-nav-qa-close { border: none; background: none; font-size: 24px; cursor: pointer; color: var(--cx-g500, #64748b); }
.cx-nav-qa-list { list-style: none; margin: 0; padding: 8px; flex: 1; overflow-y: auto; }
.cx-nav-qa-item {
	display: flex;
	align-items: center;
	gap: 12px;
	width: 100%;
	padding: 12px 14px;
	border: none;
	background: none;
	border-radius: 12px;
	text-decoration: none;
	color: var(--cx-nav-text);
	font-size: 14px;
	font-weight: 600;
	cursor: pointer;
	text-align: left;
}
.cx-nav-qa-item:hover, .cx-nav-qa-item:focus-visible { background: var(--cx-g100, #f1f5f9); outline: none; }
.cx-nav-qa-icon svg { width: 20px; height: 20px; color: var(--cx-nav-accent); }
.cx-nav-qa-count { margin-left: auto; font-size: 11px; font-weight: 800; background: var(--cx-nav-accent); color: #fff; padding: 2px 8px; border-radius: 100px; }

.cx-nav-recent-panel { padding: 0 16px 16px; border-top: 1px solid var(--cx-border, #e2e8f0); }
.cx-nav-recent-panel h3 { font-size: 12px; font-weight: 800; margin: 12px 0 8px; color: var(--cx-g500, #64748b); }
.cx-nav-recent-list { list-style: none; margin: 0; padding: 0; }
.cx-nav-recent-list li a { display: flex; gap: 8px; padding: 8px 0; text-decoration: none; color: var(--cx-nav-text); font-size: 13px; font-weight: 600; }

/* Bottom navigation */
.cx-nav-bottom {
	position: fixed;
	bottom: 0;
	left: 0;
	right: 0;
	z-index: calc(var(--cx-nav-z) - 1);
	height: calc(var(--cx-nav-bottom-h) + env(safe-area-inset-bottom, 0px));
	padding-bottom: env(safe-area-inset-bottom, 0px);
	background: var(--cx-nav-bg);
	border-top: 1px solid var(--cx-border, #e2e8f0);
	box-shadow: 0 -2px 12px rgba(0,0,0,.06);
}
@media (min-width:1024px) { .cx-nav-bottom { display: none; } }
.cx-nav-gallery-fullscreen .cx-nav-bottom { transform: translateY(100%); transition: transform .25s ease; }

.cx-nav-bottom-list {
	display: flex;
	align-items: stretch;
	justify-content: space-around;
	list-style: none;
	margin: 0;
	padding: 0;
	height: var(--cx-nav-bottom-h);
}
.cx-nav-bottom-link {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	gap: 2px;
	flex: 1;
	padding: 6px 4px;
	border: none;
	background: none;
	color: var(--cx-g500, #64748b);
	text-decoration: none;
	font-size: 10px;
	font-weight: 700;
	cursor: pointer;
	position: relative;
	transition: color .15s;
}
.cx-nav-bottom-link.is-active, .cx-nav-bottom-link:hover { color: var(--cx-nav-accent); }
.cx-nav-bottom-link:focus-visible { outline: 2px solid var(--cx-nav-accent); outline-offset: -2px; }
.cx-nav-bottom-icon svg { width: 22px; height: 22px; }
.cx-nav-bottom-badge {
	position: absolute;
	top: 4px;
	right: calc(50% - 18px);
	font-size: 9px;
	font-weight: 800;
	background: #ef4444;
	color: #fff;
	min-width: 16px;
	height: 16px;
	line-height: 16px;
	text-align: center;
	border-radius: 100px;
	padding: 0 4px;
}

/* FAB */
.cx-nav-fab {
	position: fixed;
	bottom: calc(var(--cx-nav-bottom-h) + 12px + env(safe-area-inset-bottom, 0px));
	left: 50%;
	transform: translateX(-50%);
	z-index: var(--cx-nav-z);
	width: 52px;
	height: 52px;
	border: none;
	border-radius: 50%;
	background: linear-gradient(135deg, var(--cx-nav-accent), #4f46e5);
	color: #fff;
	box-shadow: 0 4px 20px rgba(99,102,241,.45);
	cursor: pointer;
	display: flex;
	align-items: center;
	justify-content: center;
	transition: transform .2s, box-shadow .2s;
}
@media (min-width:1024px) { .cx-nav-fab { bottom: 24px; right: 24px; left: auto; transform: none; } }
.cx-nav-fab:hover { transform: translateX(-50%) scale(1.06); box-shadow: 0 6px 28px rgba(99,102,241,.5); }
@media (min-width:1024px) { .cx-nav-fab:hover { transform: scale(1.06); } }
.cx-nav-fab:focus-visible { outline: 3px solid var(--cx-nav-accent); outline-offset: 3px; }
.cx-nav-fab svg { width: 24px; height: 24px; }
.cx-nav-gallery-fullscreen .cx-nav-fab { display: none; }

/* Breadcrumbs v2 */
.cx-breadcrumbs-v2 { margin: 12px 0; }
.cx-bc-list {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 4px;
	list-style: none;
	margin: 0;
	padding: 0;
	font-size: 12px;
	font-weight: 600;
}
.cx-bc-item a { color: var(--cx-nav-accent); text-decoration: none; }
.cx-bc-item a:hover { text-decoration: underline; }
.cx-bc-item span[aria-current] { color: var(--cx-g500, #64748b); }
.cx-bc-sep { color: var(--cx-g400, #94a3b8); list-style: none; }

/* Compare bar offset when bottom nav active */
.cx-nav-bottom-bar #cx-bar { bottom: calc(var(--cx-nav-bottom-h) + 16px + env(safe-area-inset-bottom, 0px)); }
.cx-nav-bottom-bar.cx-nav-fab #cx-bar { bottom: calc(var(--cx-nav-bottom-h) + 72px + env(safe-area-inset-bottom, 0px)); }

/* Dark theme support */
[data-theme="dark"] .cx-nav-header,
[data-theme="dark"] .cx-nav-bottom,
[data-theme="dark"] .cx-nav-mega-panel,
[data-theme="dark"] .cx-nav-search-panel,
[data-theme="dark"] .cx-nav-qa-panel {
	--cx-nav-bg: var(--cx-dm-card, #1e293b);
	--cx-nav-text: var(--cx-dm-text, #e2e8f0);
	border-color: var(--cx-dm-border, #334155);
}