/**
 * ============================================
 * MODERN NAVIGATION BAR STYLES
 * ============================================
 * 
 * Mobile-First Design Approach
 * - Optimized for touch interactions
 * - Minimum 44x44px touch targets
 * - High contrast colors for accessibility
 * - Smooth animations and transitions
 * - No gradients (flat design)
 * 
 * Structure:
 * 1. CSS Variables
 * 2. Desktop Navigation
 * 3. Mobile Burger Menu
 * 4. Animations
 * 5. Responsive Breakpoints
 */


/* ============================================
   1. CSS VARIABLES
   ============================================ */

:root {
    /* Brand Colors */
    --nav-primary: #2563eb;          /* Primary blue */
    --nav-primary-hover: #1d4ed8;    /* Darker blue on hover */
    --nav-primary-light: #dbeafe;    /* Light blue background */
    
    /* Neutral Colors */
    --nav-text-primary: #1f2937;     /* Dark gray text */
    --nav-text-secondary: #6b7280;   /* Medium gray text */
    --nav-text-light: #9ca3af;       /* Light gray text */
    --nav-background: #ffffff;       /* White background */
    --nav-background-alt: #f9fafb;   /* Light gray background */
    --nav-border: #e5e7eb;           /* Border color */
    
    /* Success/Admin Colors */
    --nav-success: #10b981;          /* Green for unlocked state */
    --nav-success-hover: #059669;    /* Darker green on hover */
    --nav-success-light: #d1fae5;    /* Light green background */
    
    /* Overlay */
    --nav-overlay: rgba(0, 0, 0, 0.6);
    
    /* Spacing */
    --nav-height: 64px;
    --nav-mobile-width: 320px;
    --nav-padding: 1rem;
    --nav-gap: 0.5rem;
    
    /* Touch Targets (Minimum 44x44px for accessibility) */
    --touch-target-min: 44px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-Index Layers */
    --z-nav: 1000;
    --z-mobile-overlay: 9998;
    --z-mobile-menu: 9999;
}


/* ============================================
   2. DESKTOP NAVIGATION
   ============================================ */

/* Header Container */
.modern-header {
    position: sticky;
    top: 0;
    width: 100%;
    background: var(--nav-background);
    border-bottom: 1px solid var(--nav-border);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    z-index: var(--z-nav);
}

/* Main Navigation Bar */
.modern-nav {
    width: 100%;
    height: var(--nav-height);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    gap: 2rem;
}

/* Logo Section */
.nav-logo {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    transition: transform var(--transition-fast);
}

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

.logo-link:focus-visible {
    outline: 2px solid var(--nav-primary);
    outline-offset: 4px;
    border-radius: 4px;
}

.logo-image {
    height: 48px;
    width: auto;
    display: block;
}

/* Desktop Menu (hidden on mobile) */
.nav-menu {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.nav-list {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 0.25rem;
    align-items: center;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    text-decoration: none;
    color: var(--nav-text-primary);
    font-weight: 500;
    font-size: 0.9375rem;
    border-radius: 6px;
    transition: all var(--transition-fast);
    white-space: nowrap;
    min-height: var(--touch-target-min);
}

.nav-link:hover {
    color: var(--nav-primary);
    background: var(--nav-primary-light);
}

.nav-link:focus-visible {
    outline: 2px solid var(--nav-primary);
    outline-offset: 2px;
}

/* Dropdown Arrow for Desktop */
.nav-link--dropdown {
    padding-right: 2rem;
    position: relative;
}

.dropdown-arrow {
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    transition: transform var(--transition-fast);
    opacity: 0.6;
}

.nav-item--dropdown:hover .dropdown-arrow {
    transform: translateY(-50%) rotate(180deg);
    opacity: 1;
}

/* Dropdown Menu */
.dropdown-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    min-width: 220px;
    background: var(--nav-background);
    border: 1px solid var(--nav-border);
    border-radius: 8px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.12);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
    z-index: 100;
    padding: 0.5rem 0;
}

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

.dropdown-item {
    display: block;
    padding: 0.75rem 1.25rem;
    text-decoration: none;
    color: var(--nav-text-primary);
    font-weight: 400;
    font-size: 0.9375rem;
    transition: all var(--transition-fast);
}

.dropdown-item:hover {
    background: var(--nav-primary-light);
    color: var(--nav-primary);
}

.dropdown-item:focus-visible {
    outline: 2px solid var(--nav-primary);
    outline-offset: -2px;
}

/* Desktop Security Toggle */
.nav-security {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.security-toggle {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.75rem;
    background: var(--nav-background-alt);
    border: 2px solid var(--nav-border);
    border-radius: 20px;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-weight: 500;
    font-size: 0.8rem;
    color: var(--nav-text-primary);
    min-height: 36px;
}

.security-toggle:hover {
    background: var(--nav-primary-light);
    border-color: var(--nav-primary);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.15);
}

.security-toggle:focus-visible {
    outline: 2px solid var(--nav-primary);
    outline-offset: 2px;
}

.security-toggle.unlocked {
    background: var(--nav-success-light);
    border-color: var(--nav-success);
    color: var(--nav-success);
}

.security-toggle.unlocked:hover {
    background: var(--nav-success);
    color: white;
}

.security-icon {
    font-size: 1rem;
    line-height: 1;
}

.security-text {
    font-weight: 600;
}

/* Hide mobile toggle on desktop */
.mobile-menu-toggle {
    display: none;
}


/* ============================================
   3. MOBILE BURGER MENU
   ============================================ */

/* Mobile Menu Toggle Button (Burger Icon) */
.mobile-menu-toggle {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: var(--touch-target-min);
    height: var(--touch-target-min);
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: calc(var(--z-mobile-menu) + 1);
    border-radius: 6px;
    transition: background var(--transition-fast);
}

.mobile-menu-toggle:hover {
    background: var(--nav-background-alt);
}

.mobile-menu-toggle:focus-visible {
    outline: 2px solid var(--nav-primary);
    outline-offset: 2px;
}

/* Burger Lines */
.burger-line {
    width: 24px;
    height: 3px;
    background: var(--nav-text-primary);
    border-radius: 2px;
    transition: all var(--transition-normal);
    transform-origin: center;
}

/* Animated X when menu is open */
.mobile-menu-toggle.active .burger-line-1 {
    transform: translateY(8px) rotate(45deg);
}

.mobile-menu-toggle.active .burger-line-2 {
    opacity: 0;
    transform: scaleX(0);
}

.mobile-menu-toggle.active .burger-line-3 {
    transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Menu Overlay (Dark background) */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--nav-overlay);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: var(--z-mobile-overlay);
    -webkit-tap-highlight-color: transparent;
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Mobile Menu Panel (Slides in from right) */
.mobile-menu-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: var(--nav-mobile-width);
    max-width: 100vw;
    height: 100vh;
    height: 100dvh; /* Dynamic viewport height for mobile browsers */
    background: var(--nav-background);
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.15);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    z-index: var(--z-mobile-menu);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.mobile-menu-overlay.active .mobile-menu-panel {
    transform: translateX(0);
}

/* Mobile Menu Header */
.mobile-menu-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    border-bottom: 2px solid var(--nav-border);
    background: var(--nav-background-alt);
    flex-shrink: 0;
}

.mobile-menu-title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--nav-text-primary);
}

.mobile-menu-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--touch-target-min);
    height: var(--touch-target-min);
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--nav-text-primary);
    border-radius: 6px;
    transition: all var(--transition-fast);
    padding: 0;
}

.mobile-menu-close svg {
    width: 24px;
    height: 24px;
}

.mobile-menu-close:hover {
    background: var(--nav-primary-light);
    color: var(--nav-primary);
}

.mobile-menu-close:focus-visible {
    outline: 2px solid var(--nav-primary);
    outline-offset: 2px;
}

/* Mobile Menu Navigation */
.mobile-menu-nav {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    padding: 0.75rem 0;
}

.mobile-nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

/* Mobile Navigation Items */
.mobile-nav-item {
    border-bottom: 1px solid var(--nav-border);
}

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

/* Mobile Navigation Links */
.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    text-decoration: none;
    color: var(--nav-text-primary);
    font-weight: 500;
    font-size: 1rem;
    transition: all var(--transition-fast);
    min-height: var(--touch-target-min);
    background: transparent;
    border: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
}

.mobile-nav-link:hover,
.mobile-nav-link:focus-visible {
    background: var(--nav-primary-light);
    color: var(--nav-primary);
}

.mobile-nav-link:focus-visible {
    outline: 2px solid var(--nav-primary);
    outline-offset: -2px;
}

/* Mobile Unlock Button - Always visible */
#mobile-unlock-nav-item {
    display: block !important;
    visibility: visible !important;
}

#mobile-unlock-button {
    font-weight: 600;
    display: flex !important;
    visibility: visible !important;
}

#mobile-unlock-button:hover,
#mobile-unlock-button:focus-visible {
    background: var(--nav-primary-light);
    color: var(--nav-primary);
}

/* Mobile Navigation Icons */
.mobile-nav-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.mobile-nav-icon svg {
    width: 100%;
    height: 100%;
}

.mobile-nav-label {
    flex: 1;
}

/* Mobile Dropdown Arrow */
.mobile-dropdown-arrow {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    transition: transform var(--transition-fast);
    opacity: 0.6;
    margin-left: auto;
}

.mobile-nav-link--dropdown[aria-expanded="true"] .mobile-dropdown-arrow {
    transform: rotate(180deg);
    opacity: 1;
}

/* Mobile Submenu */
.mobile-submenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
    background: var(--nav-background-alt);
}

.mobile-nav-item--dropdown.active .mobile-submenu {
    max-height: 500px;
}

.mobile-submenu-list {
    list-style: none;
    margin: 0;
    padding: 0.5rem 0;
}

.mobile-submenu-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.875rem 1.5rem 0.875rem 3.5rem;
    text-decoration: none;
    color: var(--nav-text-secondary);
    font-weight: 400;
    font-size: 0.9375rem;
    transition: all var(--transition-fast);
    min-height: var(--touch-target-min);
    border-left: 3px solid transparent;
}

.mobile-submenu-link:hover,
.mobile-submenu-link:focus-visible {
    background: white;
    color: var(--nav-primary);
    border-left-color: var(--nav-primary);
}

.mobile-submenu-link:focus-visible {
    outline: 2px solid var(--nav-primary);
    outline-offset: -2px;
}

/* External Link Icon */
.external-icon {
    width: 14px;
    height: 14px;
    opacity: 0.5;
    margin-left: 0.5rem;
}

/* Mobile Menu Footer */
.mobile-menu-footer {
    padding: 1.5rem;
    border-top: 2px solid var(--nav-border);
    background: var(--nav-background-alt);
    flex-shrink: 0;
}

/* Mobile Security Toggle */
.mobile-security-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.625rem 1rem;
    background: var(--nav-background);
    border: 2px solid var(--nav-border);
    border-radius: 10px;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--nav-text-primary);
    min-height: 40px;
}

.mobile-security-toggle:hover {
    background: var(--nav-primary-light);
    border-color: var(--nav-primary);
    color: var(--nav-primary);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.15);
}

.mobile-security-toggle:focus-visible {
    outline: 2px solid var(--nav-primary);
    outline-offset: 2px;
}

.mobile-security-toggle.unlocked {
    background: var(--nav-success-light);
    border-color: var(--nav-success);
    color: var(--nav-success);
}

.mobile-security-toggle.unlocked:hover {
    background: var(--nav-success);
    border-color: var(--nav-success-hover);
    color: white;
}

.mobile-security-icon {
    font-size: 1.1rem;
    line-height: 1;
}

.mobile-security-text {
    font-weight: 700;
}


/* ============================================
   4. ANIMATIONS
   ============================================ */

/* Fade in animation for overlay */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Slide in from right animation for mobile menu */
@keyframes slideInRight {
    from {
        transform: translateX(100%);
    }
    to {
        transform: translateX(0);
    }
}

/* Smooth expand animation for submenus */
@keyframes expandHeight {
    from {
        max-height: 0;
    }
    to {
        max-height: 500px;
    }
}


/* ============================================
   5. RESPONSIVE BREAKPOINTS
   ============================================ */

/* Desktop - Ensure navigation is always visible */
@media (min-width: 769px) {
    .nav-menu {
        display: flex !important;
        visibility: visible !important;
        opacity: 1 !important;
    }
    
    .nav-security {
        display: flex !important;
        visibility: visible !important;
        opacity: 1 !important;
    }
    
    .mobile-menu-toggle {
        display: none !important;
        visibility: hidden !important;
    }
}

/* Force desktop navigation on any screen wider than 768px */
@media (min-width: 769px) {
    .modern-nav .nav-container {
        display: flex !important;
    }
    
    .modern-nav .nav-menu {
        display: flex !important;
        flex: 1 !important;
        justify-content: center !important;
        align-items: center !important;
    }
    
    .modern-nav .nav-security {
        display: flex !important;
        flex-shrink: 0 !important;
    }
}

/* Tablet and below - Show mobile menu */
@media (max-width: 768px) {
    /* Hide desktop menu */
    .nav-menu,
    .nav-security {
        display: none;
    }
    
    /* Show mobile toggle */
    .mobile-menu-toggle {
        display: flex;
    }
    
    /* Adjust nav container padding for mobile */
    .nav-container {
        padding: 0 1rem;
    }
    
    /* Smaller logo on mobile */
    .logo-image {
        height: 36px;
    }
    
    /* Full width mobile menu on very small screens */
    .mobile-menu-panel {
        width: 100vw;
    }
}

/* Small mobile devices */
@media (max-width: 480px) {
    .nav-container {
        padding: 0 0.75rem;
    }
    
    .logo-image {
        height: 32px;
    }
    
    .mobile-menu-header {
        padding: 1rem 1.25rem;
    }
    
    .mobile-menu-title {
        font-size: 1.125rem;
    }
    
    .mobile-nav-link {
        padding: 0.875rem 1.25rem;
        font-size: 0.9375rem;
    }
    
    .mobile-submenu-link {
        padding: 0.75rem 1.25rem 0.75rem 3rem;
        font-size: 0.875rem;
    }
    
    .mobile-menu-footer {
        padding: 1.25rem;
    }
}

/* Very small devices (< 360px) */
@media (max-width: 360px) {
    .logo-image {
        height: 28px;
    }
    
    .mobile-menu-header {
        padding: 0.875rem 1rem;
    }
    
    .mobile-menu-title {
        font-size: 1rem;
    }
}

/* Large desktop - Wider nav container */
@media (min-width: 1440px) {
    .nav-container {
        max-width: 1600px;
    }
}


/* ============================================
   6. ACCESSIBILITY & UTILITIES
   ============================================ */

/* Focus visible styles for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--nav-primary);
    outline-offset: 2px;
}

/* Prevent body scroll when mobile menu is open */
body.mobile-menu-open {
    overflow: hidden;
}

/* Admin-only items (hidden by default) */
.admin-nav-item,
.mobile-admin-nav-item {
    display: none !important;
}

/* Show admin items when unlocked */
body.security-unlocked .admin-nav-item,
body.security-unlocked .mobile-admin-nav-item {
    display: block !important;
}

/* Smooth scrolling for mobile menu */
.mobile-menu-nav {
    scroll-behavior: smooth;
}

/* Webkit scrollbar styling for mobile menu */
.mobile-menu-nav::-webkit-scrollbar {
    width: 6px;
}

.mobile-menu-nav::-webkit-scrollbar-track {
    background: var(--nav-background-alt);
}

.mobile-menu-nav::-webkit-scrollbar-thumb {
    background: var(--nav-border);
    border-radius: 3px;
}

.mobile-menu-nav::-webkit-scrollbar-thumb:hover {
    background: var(--nav-text-light);
}

/* Reduced motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .nav-link,
    .mobile-nav-link,
    .mobile-submenu-link {
        border: 1px solid currentColor;
    }
    
    .security-toggle,
    .mobile-security-toggle {
        border-width: 3px;
    }
}

/* Dark mode support (optional - uncomment if needed) */
/*
@media (prefers-color-scheme: dark) {
    :root {
        --nav-text-primary: #f9fafb;
        --nav-text-secondary: #d1d5db;
        --nav-background: #1f2937;
        --nav-background-alt: #111827;
        --nav-border: #374151;
    }
}
*/

/* ============================================
   MOBILE NOTICE BAR
   ============================================ */

.mobile-notice-bar {
    display: none;
    background: #fff3cd;
    border-bottom: 1px solid #ffc107;
    padding: 10px 12px;
    text-align: center;
    font-size: 13px;
    color: #856404;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

.mobile-notice-icon {
    margin-right: 6px;
}

@media (max-width: 768px) {
    .mobile-notice-bar {
        display: block;
    }
}