/* ================================================================
   Enhanced Navigation Component - Production Ready
   Implements UX specifications with WCAG 2.1 AA compliance
   ================================================================ */

/* Core Navigation Structure */
.enhanced-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 90px;
    background: rgba(27, 47, 69, 0.55);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    z-index: 99999;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 clamp(2rem, 5vw, 8rem);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    max-width: 100vw;
    box-sizing: border-box;
    overflow: visible;
}

.enhanced-nav.scrolled {
    background: rgba(27, 47, 69, 0.9);
    backdrop-filter: blur(30px);
    height: 75px;
    border-bottom-color: rgba(255, 127, 65, 0.2);
}

/* Logo Styling */
.enhanced-nav .nav-logo {
    flex-shrink: 0;
    z-index: 100000;
}

.enhanced-nav .nav-logo img {
    height: clamp(40px, 6vw, 55px);
    width: auto;
    transition: all 0.4s ease;
    filter: drop-shadow(0 0 20px rgba(255, 127, 65, 0.3));
}

.enhanced-nav.scrolled .nav-logo img {
    height: clamp(35px, 5vw, 45px);
}

/* Navigation Links */
.enhanced-nav .nav-links {
    display: flex;
    list-style: none;
    gap: clamp(1rem, 2.5vw, 2.5rem);
    align-items: center;
    margin: 0;
    padding: 0;
    flex-wrap: nowrap;
    min-height: 60px;
}

.enhanced-nav .nav-links a {
    color: #FFFFFF;
    text-decoration: none;
    font-weight: 500;
    font-size: clamp(0.9rem, 1.1vw, 1.05rem);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    padding: 0.75rem clamp(0.8rem, 1.5vw, 1.25rem);
    border-radius: 12px;
    letter-spacing: 0.3px;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    outline: none;
    border: 2px solid transparent;
}

/* Focus Styles for Accessibility */
.enhanced-nav .nav-links a:focus-visible {
    border-color: #FF7F41;
    background: rgba(255, 127, 65, 0.1);
    box-shadow: 0 0 0 2px rgba(255, 127, 65, 0.3);
}

.enhanced-nav .nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #FF7F41, #FF9F61);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateX(-50%);
}

.enhanced-nav .nav-links a:hover {
    background: rgba(255, 127, 65, 0.1);
    color: #FF7F41;
    transform: translateY(-2px);
}

.enhanced-nav .nav-links a:hover::after {
    width: 80%;
}

.enhanced-nav .nav-links li.active a {
    background: linear-gradient(135deg, #FF7F41, #FF9F61);
    color: #FFFFFF;
    box-shadow: 0 0 40px rgba(255, 127, 65, 0.3);
}

/* Enhanced Dropdown Menu */
.enhanced-dropdown {
    position: relative;
}

.enhanced-dropdown > a {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.enhanced-dropdown .dropdown-chevron {
    font-size: 0.8rem;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    margin-left: 0.25rem;
}

.enhanced-dropdown.dropdown-open .dropdown-chevron {
    transform: rotate(180deg);
}

.enhanced-dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
    background: rgba(27, 47, 69, 0.95);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    border-radius: 16px;
    padding: 0.75rem 0;
    min-width: 240px;
    max-width: 300px;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(255, 127, 65, 0.3);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(255, 127, 65, 0.1);
    z-index: 999999;
    box-sizing: border-box;
}

.enhanced-dropdown.dropdown-show .enhanced-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}

.enhanced-dropdown-menu[role="menu"] {
    outline: none;
}

.enhanced-dropdown-menu .dropdown-item {
    display: block;
    padding: 0.875rem 1.75rem;
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 0;
    font-size: 1rem;
    white-space: nowrap;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
    outline: none;
    border: 2px solid transparent;
}

.enhanced-dropdown-menu .dropdown-item:focus-visible {
    background: rgba(255, 127, 65, 0.15);
    color: #FF7F41;
    border-color: #FF7F41;
    outline: none;
}

.enhanced-dropdown-menu .dropdown-item:hover {
    background: rgba(255, 127, 65, 0.15);
    color: #FF7F41;
    transform: translateX(5px);
}

.enhanced-dropdown-menu .dropdown-item:first-child {
    border-top-left-radius: 12px;
    border-top-right-radius: 12px;
}

.enhanced-dropdown-menu .dropdown-item:last-child {
    border-bottom-left-radius: 12px;
    border-bottom-right-radius: 12px;
}

/* Safe Zone for Mouse Movement */
.enhanced-dropdown::before {
    content: '';
    position: absolute;
    top: 100%;
    left: -20px;
    right: -20px;
    height: 20px;
    background: transparent;
    pointer-events: auto;
    z-index: 9999;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 10001;
    background: none;
    border: none;
    width: 30px;
    height: 30px;
    justify-content: space-between;
    outline: none;
    border-radius: 4px;
    border: 2px solid transparent;
}

.mobile-menu-toggle:focus-visible {
    border-color: #FF7F41;
    box-shadow: 0 0 0 2px rgba(255, 127, 65, 0.3);
}

.mobile-menu-toggle span {
    width: 100%;
    height: 3px;
    background: #FFFFFF;
    border-radius: 2px;
    transition: all 0.3s ease;
    transform-origin: center;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Screen Reader Only Content */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .enhanced-nav .nav-links a {
        border: 1px solid transparent;
    }
    
    .enhanced-nav .nav-links a:hover,
    .enhanced-nav .nav-links a:focus-visible {
        border-color: currentColor;
    }
    
    .enhanced-dropdown-menu {
        border: 2px solid currentColor;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    .enhanced-nav,
    .enhanced-nav .nav-links a,
    .enhanced-dropdown-menu,
    .enhanced-dropdown .dropdown-chevron,
    .mobile-menu-toggle span {
        transition: none;
    }
    
    .enhanced-nav .nav-links a:hover {
        transform: none;
    }
    
    .enhanced-dropdown-menu .dropdown-item:hover {
        transform: none;
    }
}

/* Mobile Responsive Design */
@media (max-width: 768px) {
    .enhanced-nav {
        padding: 0 1.5rem;
        height: 70px;
    }
    
    .enhanced-nav.scrolled {
        height: 65px;
    }
    
    .enhanced-nav .nav-links {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .enhanced-nav .nav-logo img {
        height: clamp(30px, 8vw, 40px);
    }
    
    .enhanced-nav.scrolled .nav-logo img {
        height: clamp(25px, 7vw, 35px);
    }
}

/* Tablet Responsive Design */
@media (max-width: 1024px) and (min-width: 769px) {
    .enhanced-nav {
        padding: 0 2rem;
    }
    
    .enhanced-nav .nav-links {
        gap: 1.5rem;
    }
    
    .enhanced-dropdown-menu {
        min-width: 220px;
    }
}

/* Large Screen Optimizations */
@media (min-width: 1400px) {
    .enhanced-nav {
        padding: 0 6rem;
    }
    
    .enhanced-dropdown-menu {
        min-width: 280px;
    }
}

/* Print Styles */
@media print {
    .enhanced-nav {
        display: none;
    }
}

/* Dark Mode Support (if needed) */
@media (prefers-color-scheme: light) {
    .enhanced-nav {
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(25px);
        border-bottom-color: rgba(0, 0, 0, 0.1);
    }
    
    .enhanced-nav .nav-links a {
        color: #1B2F45;
    }
    
    .enhanced-dropdown-menu {
        background: rgba(255, 255, 255, 0.95);
        border-color: rgba(255, 127, 65, 0.3);
    }
    
    .enhanced-dropdown-menu .dropdown-item {
        color: rgba(27, 47, 69, 0.85);
    }
    
    .mobile-menu-toggle span {
        background: #1B2F45;
    }
}

/* Performance Optimizations */
.enhanced-nav * {
    will-change: auto;
}

.enhanced-dropdown-menu {
    will-change: opacity, visibility, transform;
}

.enhanced-dropdown .dropdown-chevron {
    will-change: transform;
}

/* Fix for Webkit-based browsers */
@supports (-webkit-backdrop-filter: blur(1px)) {
    .enhanced-nav {
        -webkit-backdrop-filter: blur(25px);
    }
    
    .enhanced-dropdown-menu {
        -webkit-backdrop-filter: blur(25px);
    }
}

/* Fallback for browsers without backdrop-filter */
@supports not (backdrop-filter: blur(1px)) and not (-webkit-backdrop-filter: blur(1px)) {
    .enhanced-nav {
        background: rgba(27, 47, 69, 0.9);
    }
    
    .enhanced-dropdown-menu {
        background: rgba(27, 47, 69, 0.95);
    }
}