/**
 * ============================================================================
 * Header & Navigation Styles
 * ============================================================================
 * Professional header navigation styling with smooth animations,
 * hover effects, and responsive behavior.
 * ============================================================================
 */

/* ===========================
   Header Container
   =========================== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--header-background, var(--color-background, white));
    color: var(--header-text-color, var(--color-text-primary, #374151));
    font-family: var(--header-font-family, inherit);
    font-weight: var(--header-font-weight, 500);
    letter-spacing: var(--header-letter-spacing, 0em);
    text-transform: var(--header-text-transform, none);
    backdrop-filter: blur(10px);
    transition: all var(--header-transition-duration, 300ms) cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--header-shadow, 0 1px 3px rgba(0, 0, 0, 0.05));
    border-bottom: var(--header-border-width, 0px) var(--header-border-style, solid) var(--header-border-color, transparent);
}

.site-header.scrolled {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.05);
}

/* ===========================
   Header Inner Container
   =========================== */
.header-inner {
    max-width: var(--header-max-width, 1440px);
    margin: 0 auto;
    padding: var(--header-padding-y, 0px) var(--header-padding-x, 24px);
    height: var(--header-height, 64px);
    display: flex;
    align-items: var(--header-vertical-alignment, center);
    gap: var(--header-item-spacing, 2rem);
}

/* Layout: Default - Logo left, Menu center, User right */
.header-inner-default {
    justify-content: space-between;
}

.header-inner-default .main-nav {
    flex: 1;
    justify-content: center;
}

/* Layout: Centered - All items centered */
.header-inner-centered {
    justify-content: center;
    flex-direction: column;
    gap: 1rem;
    height: auto;
    min-height: var(--header-height, 64px);
    padding-top: 1rem;
    padding-bottom: 1rem;
}

.header-inner-centered .header-logo {
    margin-bottom: 0.5rem;
}

.header-inner-centered .main-nav,
.header-inner-centered .header-user-section {
    justify-content: center;
}

/* Layout: Minimalist - Compact, everything inline */
.header-inner-minimalist {
    justify-content: flex-start;
    gap: 1rem;
}

.header-inner-minimalist .main-nav {
    flex: 0;
}

.header-inner-minimalist .header-logo {
    margin-right: auto;
}

@media (max-width: 768px) {
    .header-inner {
        padding: 0 1rem;
        gap: 1rem;
    }
    
    /* On mobile, all layouts behave the same */
    .header-inner-centered,
    .header-inner-minimalist {
        flex-direction: row;
        height: var(--header-height, 64px);
        padding-top: 0;
        padding-bottom: 0;
        justify-content: space-between;
    }
}

/* ===========================
   Logo Section
   =========================== */
.header-logo {
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.header-logo:hover {
    transform: scale(1.05);
}

.header-logo img {
    height: var(--header-logo-max-height, 40px);
    max-height: var(--header-logo-max-height, 40px);
    width: auto;
    object-fit: contain;
    transition: opacity var(--header-transition-duration, 300ms) ease;
}

.header-logo img:hover {
    opacity: 0.9;
}

.header-logo-gradient {
    width: var(--header-logo-max-height, 40px);
    height: var(--header-logo-max-height, 40px);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary, #7c3aed) 0%, var(--color-secondary, #ec4899) 100%);
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    box-shadow: 0 4px 6px color-mix(in srgb, var(--color-primary, #7c3aed) 30%, transparent);
    transition: all 0.3s ease;
}

.header-logo-gradient:hover {
    box-shadow: 0 6px 12px color-mix(in srgb, var(--color-primary, #7c3aed) 40%, transparent);
    transform: translateY(-2px);
}

/* ===========================
   Main Navigation
   =========================== */
.main-nav {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: var(--header-menu-alignment, center);
    gap: 0.5rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--header-item-spacing, 0.25rem);
    list-style: none;
    margin: 0;
    padding: 0;
    font-size: var(--header-font-size, 16px);
}

/* ===========================
   Navigation Links
   =========================== */
.nav-link {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: var(--header-item-padding-y, 0.625rem) var(--header-item-padding-x, 1rem);
    font-size: var(--header-font-size, 16px);
    font-weight: var(--header-font-weight, 500);
    color: var(--header-text-color, var(--color-text-primary, #374151));
    text-decoration: none;
    border-radius: var(--header-border-radius, 8px);
    transition: all var(--header-transition-duration, 250ms) cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--header-hover-color, var(--color-primary, #7c3aed));
    background: color-mix(in srgb, var(--header-hover-color, var(--color-primary, #7c3aed)) var(--header-hover-bg-opacity, 8%) , transparent);
}

/* Hover Effects - Lift */
.header-hover-lift .nav-link:hover {
    transform: translateY(-2px);
}

/* Hover Effects - Scale */
.header-hover-scale .nav-link:hover {
    transform: scale(1.05);
}

/* Hover Effects - Glow */
.header-hover-glow .nav-link:hover {
    filter: brightness(1.15);
    box-shadow: 0 0 12px color-mix(in srgb, var(--header-hover-color, var(--color-primary, #7c3aed)) 25%, transparent);
}

/* Hover Effects - None (no transform) */
.header-hover-none .nav-link:hover {
    transform: none;
}

/* When header has gradient background, make hover effect white */
.header-layout-gradient .nav-link:hover,
.site-header:has([style*="gradient"]) .nav-link:hover {
    color: white;
    background: rgba(255, 255, 255, 0.15);
}

/* Active Link State */
.nav-link.active {
    color: var(--header-active-color, var(--color-primary, #7c3aed));
    background: color-mix(in srgb, var(--header-active-color, var(--color-primary, #7c3aed)) var(--header-active-bg-opacity, 12%), transparent);
    font-weight: 600;
}

/* Active link on gradient background */
.header-layout-gradient .nav-link.active,
.site-header:has([style*="gradient"]) .nav-link.active {
    color: white;
    background: rgba(255, 255, 255, 0.2);
}

/* Link Underline Effect */
.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0.25rem;
    left: 1rem;
    right: 1rem;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary, #7c3aed), var(--color-secondary, #ec4899));
    border-radius: 1px;
    opacity: 0;
    transform: scaleX(0);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-link:hover::after,
.nav-link.active::after {
    opacity: 1;
    transform: scaleX(1);
}

/* White underline for gradient backgrounds */
.site-header:has([style*="gradient"]) .nav-link::after {
    background: white;
}

/* Link Icons */
.nav-link i,
.nav-link svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    opacity: 0.7;
    transition: opacity 0.25s ease;
}

.nav-link:hover i,
.nav-link:hover svg,
.nav-link.active i,
.nav-link.active svg {
    opacity: 1;
}

/* ===========================
   Dropdown Menus
   =========================== */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.nav-dropdown-icon {
    width: 14px;
    height: 14px;
    transition: transform 0.3s ease;
}

.nav-dropdown.open .nav-dropdown-icon {
    transform: rotate(180deg);
}

.nav-dropdown-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    min-width: 220px;
    background: var(--color-surface, white);
    border: 1px solid var(--color-border, #e5e7eb);
    border-radius: var(--header-border-radius, 8px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 100;
    overflow: hidden;
}

.nav-dropdown.open .nav-dropdown-menu,
.nav-dropdown:hover .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: var(--header-dropdown-padding, 0.75rem) 1rem;
    color: var(--color-text-primary, #374151);
    text-decoration: none;
    font-size: calc(var(--header-font-size, 16px) * 0.875);
    transition: all var(--header-transition-duration, 250ms) ease;
    border-left: 3px solid transparent;
}

.nav-dropdown-item:hover {
    background: color-mix(in srgb, var(--header-hover-color, var(--color-primary, #7c3aed)) var(--header-hover-bg-opacity, 8%), transparent);
    color: var(--header-hover-color, var(--color-primary, #7c3aed));
    border-left-color: var(--header-hover-color, var(--color-primary, #7c3aed));
    padding-left: 1.25rem;
}

.nav-dropdown-item i,
.nav-dropdown-item svg {
    width: 16px;
    height: 16px;
    opacity: 0.7;
}

.nav-dropdown-item:hover i,
.nav-dropdown-item:hover svg {
    opacity: 1;
}

/* ===========================
   User Section
   =========================== */
.header-user-section {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-shrink: 0;
}

/* ===========================
   Mobile Menu Toggle
   =========================== */
.mobile-menu-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    border-radius: var(--header-border-radius, 8px);
    cursor: pointer;
    transition: background 0.2s ease;
}

.mobile-menu-toggle:hover {
    background: color-mix(in srgb, var(--color-primary, #7c3aed) 10%, transparent);
}

.mobile-menu-toggle svg {
    width: 24px;
    height: 24px;
    color: var(--header-text-color, var(--color-text-primary, #374151));
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }
    
    .main-nav {
        display: none;
    }
}

/* ===========================
   Mobile Menu
   =========================== */
.mobile-menu {
    position: fixed;
    top: var(--header-height, 64px);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-background, white);
    z-index: 40;
    overflow-y: auto;
    transform: translateX(-100%);
    transition: transform var(--header-transition-duration, 300ms) cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: inset 0 1px 0 rgba(0, 0, 0, 0.1);
}

/* Right-side mobile menu */
.mobile-menu.mobile-menu-right {
    transform: translateX(100%);
}

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

.mobile-menu-content {
    padding: 1.5rem var(--header-padding-x, 24px);
    max-width: 600px;
    margin: 0 auto;
}

/* Mobile Menu Links */
.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    color: var(--color-text-primary, #374151);
    text-decoration: none;
    font-size: var(--header-font-size, 16px);
    font-weight: var(--header-font-weight, 500);
    border-radius: var(--header-border-radius, 8px);
    margin-bottom: 0.5rem;
    transition: all var(--header-transition-duration, 250ms) ease;
    border-left: 4px solid transparent;
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    background: color-mix(in srgb, var(--header-hover-color, var(--color-primary, #7c3aed)) 10%, transparent);
    color: var(--header-hover-color, var(--color-primary, #7c3aed));
    border-left-color: var(--header-hover-color, var(--color-primary, #7c3aed));
    padding-left: 1.5rem;
}

.mobile-nav-link i,
.mobile-nav-link svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    opacity: 0.7;
}

.mobile-nav-link:hover i,
.mobile-nav-link:hover svg {
    opacity: 1;
}

/* Mobile Menu Section */
.mobile-menu-section {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border, #e5e7eb);
}

.mobile-menu-section-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary, #6b7280);
    margin-bottom: 1rem;
    padding: 0 1rem;
}

/* ===========================
   Search Bar (if present)
   =========================== */
.header-search {
    position: relative;
    flex: 1;
    max-width: 400px;
}

.header-search-input {
    width: 100%;
    padding: 0.625rem 1rem 0.625rem 2.75rem;
    border: 1px solid var(--color-border, #e5e7eb);
    border-radius: var(--header-border-radius, 8px);
    font-size: calc(var(--header-font-size, 16px) * 0.875);
    transition: all 0.2s ease;
    background: var(--color-surface-variant, #f9fafb);
    color: var(--color-text-primary, inherit);
}

/* Search bar on gradient background */
.site-header:has([style*="gradient"]) .header-search-input {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
    color: white;
}

.site-header:has([style*="gradient"]) .header-search-input::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.header-search-input:focus {
    outline: none;
    border-color: var(--color-primary, #7c3aed);
    background: var(--color-surface, white);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary, #7c3aed) 10%, transparent);
}

.site-header:has([style*="gradient"]) .header-search-input:focus {
    background: rgba(255, 255, 255, 0.25);
    border-color: white;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.2);
}

.header-search-icon {
    position: absolute;
    left: 0.875rem;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--color-text-secondary, #6b7280);
    pointer-events: none;
}

.site-header:has([style*="gradient"]) .header-search-icon {
    color: rgba(255, 255, 255, 0.8);
}

/* ===========================
   Search Autocomplete Dropdown
   =========================== */
.search-autocomplete {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: var(--color-surface, #ffffff);
    border: 1px solid var(--color-border, #e5e7eb);
    border-radius: var(--border-radius-lg, 12px);
    box-shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.2),
                0 8px 16px -8px rgba(0, 0, 0, 0.1);
    max-height: 440px;
    overflow-y: auto;
    z-index: 100;
    display: none;
    animation: autocompleteSlide 0.2s ease-out;
}

.search-autocomplete.active {
    display: block;
}

@keyframes autocompleteSlide {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.search-autocomplete::-webkit-scrollbar {
    width: 6px;
}

.search-autocomplete::-webkit-scrollbar-track {
    background: transparent;
}

.search-autocomplete::-webkit-scrollbar-thumb {
    background: var(--color-border, #e5e7eb);
    border-radius: 3px;
}

.search-autocomplete::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary, #7c3aed);
}

/* Autocomplete Header */
.autocomplete-header {
    padding: 0.75rem 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-muted, #9ca3af);
    border-bottom: 1px solid var(--color-border, #e5e7eb);
    background: color-mix(in srgb, var(--color-surface, #fff) 50%, var(--color-border, #e5e7eb));
}

/* Autocomplete Item */
.autocomplete-item {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    padding: 0.75rem 1rem;
    text-decoration: none;
    transition: all 0.15s ease;
    border-bottom: 1px solid color-mix(in srgb, var(--color-border, #e5e7eb) 50%, transparent);
}

.autocomplete-item:last-child {
    border-bottom: none;
}

.autocomplete-item:hover,
.autocomplete-item.active {
    background: color-mix(in srgb, var(--color-primary, #7c3aed) 6%, transparent);
}

.autocomplete-item:hover .autocomplete-title,
.autocomplete-item.active .autocomplete-title {
    color: var(--color-primary, #7c3aed);
}

/* Autocomplete Cover Image */
.autocomplete-cover {
    width: 48px;
    height: 64px;
    flex-shrink: 0;
    border-radius: 6px;
    overflow: hidden;
    background: linear-gradient(145deg, 
        color-mix(in srgb, var(--color-primary, #7c3aed) 15%, #f3f4f6),
        color-mix(in srgb, var(--color-secondary, #ec4899) 10%, #f3f4f6));
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.autocomplete-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.autocomplete-cover-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    font-size: 1.25rem;
    color: var(--color-text-muted, #9ca3af);
}

/* Autocomplete Content */
.autocomplete-content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.autocomplete-title {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-text-primary, #111827);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color 0.15s ease;
}

.autocomplete-title mark {
    background: color-mix(in srgb, var(--color-primary, #7c3aed) 20%, transparent);
    color: inherit;
    padding: 0 2px;
    border-radius: 2px;
}

.autocomplete-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.autocomplete-author {
    font-size: 0.8rem;
    color: var(--color-text-secondary, #6b7280);
}

.autocomplete-stats {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    font-size: 0.75rem;
    color: var(--color-text-muted, #9ca3af);
}

.autocomplete-stat {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.autocomplete-status {
    padding: 0.2rem 0.5rem;
    border-radius: 999px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: capitalize;
}

.autocomplete-status.ongoing {
    background: color-mix(in srgb, var(--color-success, #10b981) 12%, transparent);
    color: var(--color-success, #059669);
}

.autocomplete-status.completed {
    background: color-mix(in srgb, var(--color-primary, #3b82f6) 12%, transparent);
    color: var(--color-primary, #2563eb);
}

.autocomplete-status.hiatus {
    background: color-mix(in srgb, var(--color-warning, #f59e0b) 12%, transparent);
    color: var(--color-warning, #d97706);
}

/* Autocomplete Footer */
.autocomplete-footer {
    padding: 0.65rem 1rem;
    text-align: center;
    border-top: 1px solid var(--color-border, #e5e7eb);
    background: color-mix(in srgb, var(--color-surface, #fff) 50%, var(--color-border, #e5e7eb));
}

.autocomplete-footer a {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-primary, #7c3aed);
    text-decoration: none;
    transition: color 0.15s ease;
}

.autocomplete-footer a:hover {
    color: color-mix(in srgb, var(--color-primary, #7c3aed) 80%, #000);
}

/* Empty State */
.autocomplete-empty {
    padding: 2rem 1rem;
    text-align: center;
    color: var(--color-text-muted, #9ca3af);
}

.autocomplete-empty-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    opacity: 0.5;
}

.autocomplete-empty-text {
    font-size: 0.9rem;
}

/* Loading State */
.autocomplete-loading {
    padding: 1.5rem;
    text-align: center;
    color: var(--color-text-secondary, #6b7280);
}

.autocomplete-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border, #e5e7eb);
    border-top-color: var(--color-primary, #7c3aed);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: 0.5rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Hero search autocomplete overrides */
.hero-search .search-autocomplete {
    min-width: 360px;
    z-index: 1000;
}

/* ===========================
   Animations
   =========================== */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* ===========================
   Utility Classes
   =========================== */
.header-divider {
    width: 1px;
    height: 24px;
    background: var(--color-border, #e5e7eb);
    margin: 0 0.5rem;
}

/* ===========================
   Responsive Adjustments
   =========================== */
@media (max-width: 1024px) {
    .header-inner {
        gap: 1.5rem;
    }
    
    .nav-menu {
        gap: 0;
    }
    
    .nav-link {
        padding: 0.5rem 0.75rem;
        font-size: 0.875rem;
    }
}

@media (max-width: 768px) {
    .header-search {
        display: none;
    }
}

/* ===========================
   Accessibility
   =========================== */
.nav-link:focus,
.mobile-nav-link:focus,
.header-search-input:focus {
    outline: 2px solid var(--color-primary, #7c3aed);
    outline-offset: 2px;
}

/* Skip to main content link */
.skip-to-main {
    position: absolute;
    left: -9999px;
    z-index: 999;
    padding: 1rem 1.5rem;
    background: var(--color-primary, #7c3aed);
    color: white;
    text-decoration: none;
    border-radius: 0 0 0.5rem 0;
    font-weight: 600;
}

.skip-to-main:focus {
    left: 0;
    top: 0;
}

/* ===========================
   Performance Optimizations
   =========================== */
.site-header,
.mobile-menu {
    will-change: transform;
}

.nav-link,
.mobile-nav-link {
    will-change: transform, background-color;
}