/**
 * Hello Middleton - Navigation Components
 * Header, mobile bottom nav, menus, and navigation elements.
 *
 * @requires critical/tokens.css
 */

/* =========================================================================
   SITE HEADER
   ========================================================================= */

.site-header,
#masthead {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background: var(--hm-bg-elevated);
    border-bottom: 1px solid var(--hm-border);
    transition:
        box-shadow var(--duration-normal) var(--ease-out),
        backdrop-filter var(--duration-normal) var(--ease-out),
        background var(--duration-normal) var(--ease-out);
}

/* Scrolled state */
.site-header.scrolled,
#masthead.scrolled {
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.95);
}

/* Header container */
.site-header .container,
.masthead-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: var(--header-height);
    padding: 0 var(--space-4);
    max-width: var(--content-width);
    margin: 0 auto;
}

/* =========================================================================
   SITE BRANDING / LOGO
   ========================================================================= */

.site-branding {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.custom-logo,
.site-logo img {
    height: auto;
    max-height: 48px;
    width: auto;
}

.site-title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--hm-text);
    margin: 0;
    line-height: 1;
}

.site-title a {
    color: inherit;
    text-decoration: none;
}

.site-description {
    font-size: var(--text-xs);
    color: var(--hm-text-muted);
    margin: 0;
}

/* =========================================================================
   PRIMARY NAVIGATION (Desktop)
   ========================================================================= */

.main-navigation,
.primary-menu,
#site-navigation {
    display: none;
}

@media (min-width: 768px) {
    .main-navigation,
    .primary-menu,
    #site-navigation {
        display: flex;
        align-items: center;
        gap: var(--space-1);
    }
}

/* Navigation list */
.main-navigation ul,
.primary-menu ul {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    list-style: none;
    margin: 0;
    padding: 0;
}

/* Navigation links */
.main-navigation a,
.primary-menu a {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--hm-text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition:
        color var(--duration-fast) var(--ease-out),
        background var(--duration-fast) var(--ease-out);
}

.main-navigation a:hover,
.primary-menu a:hover {
    color: var(--hm-text);
    background: var(--hm-bg-subtle);
}

/* Current/active page */
.main-navigation .current-menu-item > a,
.primary-menu .current-menu-item > a {
    color: var(--hm-primary);
    font-weight: var(--font-semibold);
}

/* =========================================================================
   DROPDOWN MENUS (Desktop)
   ========================================================================= */

.main-navigation .sub-menu,
.primary-menu .sub-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    padding: var(--space-2);
    background: var(--hm-bg-elevated);
    border: 1px solid var(--hm-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition:
        opacity var(--duration-fast) var(--ease-out),
        visibility var(--duration-fast) var(--ease-out),
        transform var(--duration-fast) var(--ease-out);
    z-index: var(--z-dropdown);
}

.main-navigation li:hover > .sub-menu,
.primary-menu li:hover > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.main-navigation .sub-menu li,
.primary-menu .sub-menu li {
    display: block;
}

.main-navigation .sub-menu a,
.primary-menu .sub-menu a {
    display: block;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
}

/* =========================================================================
   MOBILE BOTTOM NAVIGATION
   ========================================================================= */

.mobile-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--mobile-nav-height);
    display: flex;
    align-items: center;
    justify-content: space-around;
    background: rgba(255, 255, 255, 0.88);
    -webkit-backdrop-filter: blur(12px) saturate(180%);
    backdrop-filter: blur(12px) saturate(180%);
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    padding-bottom: env(safe-area-inset-bottom, 0);
    z-index: var(--z-fixed);
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.08);
}

/* Fallback for browsers without backdrop-filter support */
@supports not (backdrop-filter: blur(1px)) {
    .mobile-bottom-nav {
        background: var(--hm-bg-elevated);
        border-top: 1px solid var(--hm-border);
    }
}

/* Hide on desktop */
@media (min-width: 768px) {
    .mobile-bottom-nav {
        display: none;
    }
}

/* Navigation items */
.mobile-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-0-5);
    padding: var(--space-2);
    min-width: 60px;
    min-height: 48px;
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--hm-text-muted);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition:
        color var(--duration-fast) var(--ease-out),
        background var(--duration-fast) var(--ease-out);
    -webkit-tap-highlight-color: transparent;
}

.mobile-nav-item:hover,
.mobile-nav-item:active {
    color: var(--hm-text);
    background: var(--hm-bg-subtle);
}

.mobile-nav-item.active {
    color: var(--hm-primary);
}

/* Icon container */
.mobile-nav-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

/* SVG icon styling */
.mobile-nav-icon .hm-icon,
.mobile-menu-icon .hm-icon,
.hm-icon {
    flex-shrink: 0;
    stroke-width: 2;
    transition: transform var(--duration-fast) var(--ease-out);
}

/* Touch feedback on icons */
.mobile-nav-item:active .hm-icon {
    transform: scale(0.9);
}

/* Center "Post" button - elevated style */
.mobile-nav-item.nav-post {
    position: relative;
    color: var(--hm-text-inverse);
    background: var(--hm-primary);
    border-radius: var(--radius-full);
    padding: var(--space-2) var(--space-4);
    margin-top: -12px;
    box-shadow: var(--shadow-md);
}

.mobile-nav-item.nav-post:hover,
.mobile-nav-item.nav-post:active {
    background: var(--hm-primary-hover);
    color: var(--hm-text-inverse);
}

/* =========================================================================
   MOBILE MENU SHEET
   ========================================================================= */

.mobile-menu-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition:
        opacity var(--duration-normal) var(--ease-out),
        visibility var(--duration-normal) var(--ease-out);
    z-index: var(--z-modal-backdrop);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}

.mobile-menu-backdrop.open {
    opacity: 1;
    visibility: visible;
}

.mobile-menu-sheet {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    max-height: 70vh;
    background: rgba(255, 255, 255, 0.92);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    backdrop-filter: blur(16px) saturate(180%);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    box-shadow: var(--shadow-xl);
    transform: translateY(100%);
    transition: transform var(--duration-normal) var(--ease-out);
    z-index: var(--z-modal);
    overflow: hidden;
    padding-bottom: env(safe-area-inset-bottom, 0);
}

/* Fallback for browsers without backdrop-filter support */
@supports not (backdrop-filter: blur(1px)) {
    .mobile-menu-sheet {
        background: var(--hm-bg-elevated);
    }
    .mobile-menu-backdrop {
        background: rgba(0, 0, 0, 0.7);
    }
}

.mobile-menu-sheet.open {
    transform: translateY(0);
}

/* Sheet header */
.mobile-menu-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--hm-border);
}

.mobile-menu-title {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--hm-text);
}

.mobile-menu-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    font-size: var(--text-lg);
    color: var(--hm-text-muted);
    background: var(--hm-bg-subtle);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background var(--duration-fast) var(--ease-out);
}

.mobile-menu-close:hover {
    background: var(--hm-bg-muted);
}

/* Sheet content */
.mobile-menu-content {
    padding: var(--space-3) var(--space-4);
    overflow-y: auto;
    max-height: calc(70vh - 60px);
}

/* Menu items */
.mobile-menu-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    min-height: 48px; /* Touch target compliance */
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    color: var(--hm-text);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: background var(--duration-fast) var(--ease-out);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation; /* Prevent double-tap zoom */
}

.mobile-menu-item:hover,
.mobile-menu-item:active {
    background: var(--hm-bg-subtle);
}

.mobile-menu-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    color: var(--hm-text-secondary);
}

/* Active state for menu items */
.mobile-menu-item:active .hm-icon {
    transform: scale(0.9);
}

/* =========================================================================
   BREADCRUMBS
   ========================================================================= */

.hm-breadcrumbs,
.breadcrumbs {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--hm-text-muted);
    padding: var(--space-3) 0;
}

.hm-breadcrumbs a,
.breadcrumbs a {
    color: var(--hm-text-secondary);
    text-decoration: none;
}

.hm-breadcrumbs a:hover,
.breadcrumbs a:hover {
    color: var(--hm-primary);
}

.hm-breadcrumbs .separator,
.breadcrumbs .separator {
    color: var(--hm-text-muted);
}

.hm-breadcrumbs .current,
.breadcrumbs .current {
    color: var(--hm-text);
    font-weight: var(--font-medium);
}

/* =========================================================================
   PAGINATION
   ========================================================================= */

.hm-pagination,
.pagination,
.nav-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    padding: var(--space-6) 0;
}

.hm-pagination a,
.hm-pagination span,
.pagination a,
.pagination span,
.nav-links a,
.nav-links span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
    padding: 0 var(--space-3);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--hm-text-secondary);
    background: var(--hm-bg-elevated);
    border: 1px solid var(--hm-border);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition:
        color var(--duration-fast) var(--ease-out),
        background var(--duration-fast) var(--ease-out),
        border-color var(--duration-fast) var(--ease-out);
}

.hm-pagination a:hover,
.pagination a:hover,
.nav-links a:hover {
    color: var(--hm-text);
    background: var(--hm-bg-subtle);
    border-color: var(--hm-border-strong);
}

.hm-pagination .current,
.pagination .current,
.nav-links .current {
    color: var(--hm-text-inverse);
    background: var(--hm-primary);
    border-color: var(--hm-primary);
}

/* =========================================================================
   BACK TO TOP BUTTON
   ========================================================================= */

.hm-back-to-top,
.back-to-top {
    position: fixed;
    bottom: calc(var(--mobile-nav-height) + var(--space-4) + env(safe-area-inset-bottom, 0));
    right: var(--space-4);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--hm-bg-elevated);
    border: 1px solid var(--hm-border);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-md);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(16px);
    transition:
        opacity var(--duration-normal) var(--ease-out),
        visibility var(--duration-normal) var(--ease-out),
        transform var(--duration-normal) var(--ease-out),
        background var(--duration-fast) var(--ease-out);
    z-index: var(--z-fixed);
}

.hm-back-to-top.visible,
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.hm-back-to-top:hover,
.back-to-top:hover {
    background: var(--hm-bg-subtle);
}

@media (min-width: 768px) {
    .hm-back-to-top,
    .back-to-top {
        bottom: var(--space-6);
    }
}

/* =========================================================================
   TAB NAVIGATION (for content areas)
   ========================================================================= */

.hm-tabs {
    display: flex;
    gap: var(--space-1);
    overflow-x: auto;
    padding: var(--space-2) 0;
    border-bottom: 1px solid var(--hm-border);
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.hm-tabs::-webkit-scrollbar {
    display: none;
}

.hm-tab {
    flex-shrink: 0;
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--hm-text-secondary);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    white-space: nowrap;
    transition:
        color var(--duration-fast) var(--ease-out),
        border-color var(--duration-fast) var(--ease-out);
}

.hm-tab:hover {
    color: var(--hm-text);
}

.hm-tab.active {
    color: var(--hm-primary);
    border-bottom-color: var(--hm-primary);
}

/* Pill-style tabs */
.hm-tabs--pills {
    border-bottom: none;
    gap: var(--space-2);
}

.hm-tabs--pills .hm-tab {
    background: var(--hm-bg-subtle);
    border: none;
    border-radius: var(--radius-full);
    padding: var(--space-2) var(--space-4);
}

.hm-tabs--pills .hm-tab:hover {
    background: var(--hm-bg-muted);
}

.hm-tabs--pills .hm-tab.active {
    background: var(--hm-primary);
    color: var(--hm-text-inverse);
}