/**
 * Header Language Switcher Optimized Styles
 * Integrates with optimized language switcher v2.0
 * Author: AI Assistant
 * Date: 2025-10-03
 */

/* Header-specific language switcher styles */
.cb-header .language-switcher {
    position: relative;
    display: inline-block;
}

/* Dropdown toggle in header */
.cb-header .language-switcher .dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 15px;
    color: #fff;
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid transparent;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.cb-header .language-switcher .dropdown-toggle:hover,
.cb-header .language-switcher .dropdown-toggle:focus {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
    color: #fff;
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.cb-header .language-switcher .dropdown-toggle:focus-visible {
    outline: 2px solid #3498db;
    outline-offset: 2px;
}

/* Flag icon in header */
.cb-header .language-switcher .flag-icon {
    width: 20px;
    height: 15px;
    border-radius: 2px;
    object-fit: cover;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    will-change: transform;
}

.cb-header .language-switcher .dropdown-toggle:hover .flag-icon {
    transform: scale(1.1);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

/* Language text in header */
.cb-header .language-switcher .lang-text {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

/* Caret in header */
.cb-header .language-switcher .caret {
    border-top: 4px solid currentColor;
    border-right: 4px solid transparent;
    border-left: 4px solid transparent;
    transition: all 0.3s ease;
    opacity: 0.8;
}

.cb-header .language-switcher.open .caret {
    transform: rotate(180deg);
    opacity: 1;
}

/* Dropdown menu in header - Updated for 5 languages */
.cb-header .language-switcher .dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    z-index: 9999;
    display: none;
    min-width: 220px; /* Increased for longer language names */
    max-height: 300px; /* Prevent overflow on small screens */
    overflow-y: auto; /* Scroll if needed */
    padding: 8px 0;
    margin: 8px 0 0;
    background: #fff;
    border: none;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    list-style: none;
    animation: fadeInDown 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    backdrop-filter: blur(20px);
    will-change: opacity, transform;
}

.cb-header .language-switcher.open .dropdown-menu {
    display: block;
}

/* Dropdown menu items in header */
.cb-header .language-switcher .dropdown-menu li {
    list-style: none;
    margin: 0;
}

.cb-header .language-switcher .dropdown-menu li a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: #333;
    text-decoration: none;
    white-space: nowrap;
    transition: all 0.2s ease;
    border-radius: 6px;
    margin: 2px 8px;
    font-size: 14px;
    font-weight: 500;
}

.cb-header .language-switcher .dropdown-menu li a:hover,
.cb-header .language-switcher .dropdown-menu li a:focus {
    background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
    color: #fff;
    text-decoration: none;
    transform: translateX(3px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.cb-header .language-switcher .dropdown-menu li a:focus-visible {
    outline: 2px solid #3498db;
    outline-offset: -2px;
}

.cb-header .language-switcher .dropdown-menu li a.active {
    background: linear-gradient(135deg, #27ae60 0%, #229954 100%);
    color: #fff;
}

.cb-header .language-switcher .dropdown-menu .flag-icon {
    width: 18px;
    height: 14px;
    flex-shrink: 0;
}

/* Loading state */
.cb-header .language-switcher.loading .dropdown-toggle {
    opacity: 0.7;
    pointer-events: none;
}

.cb-header .language-switcher.loading .flag-icon {
    animation: pulse 1.5s ease-in-out infinite;
}

/* Mobile responsive adjustments - Updated for 5 languages */
@media (max-width: 768px) {
    .navbar-collapse .language-switcher {
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        margin-top: 15px;
        padding-top: 15px;
    }
    
    .navbar-collapse .language-switcher .dropdown-toggle {
        background: rgba(255, 255, 255, 0.1);
        border-radius: 6px;
        margin: 0 15px;
        justify-content: center;
        min-height: 44px; /* iOS touch target */
    }
    
    .navbar-collapse .language-switcher .dropdown-menu {
        position: static;
        display: block !important;
        float: none;
        width: auto;
        margin: 10px 15px 0;
        background: rgba(0, 0, 0, 0.3);
        border: 1px solid rgba(255, 255, 255, 0.2);
        box-shadow: none;
        backdrop-filter: blur(10px);
    }
    
    .navbar-collapse .language-switcher.open .dropdown-menu {
        display: block !important;
    }
    
    .navbar-collapse .language-switcher .dropdown-menu li a {
        color: #fff;
        padding: 14px 20px;
        margin: 2px 8px;
        min-height: 44px;
        font-size: 16px; /* Prevent zoom on iOS */
        line-height: 1.4; /* Better for Asian characters */
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 250px; /* Prevent overflow on small screens */
    }
    
    .navbar-collapse .language-switcher .dropdown-menu li a:hover,
    .navbar-collapse .language-switcher .dropdown-menu li a:focus {
        background: rgba(255, 255, 255, 0.2);
        transform: translateX(5px);
    }
}

@media (max-width: 480px) {
    .cb-header .language-switcher .dropdown-toggle {
        padding: 6px 10px;
    }
    
    .cb-header .language-switcher .flag-icon {
        width: 16px;
        height: 12px;
    }
    
    .cb-header .language-switcher .lang-text {
        font-size: 11px;
    }
    
    .cb-header .language-switcher .dropdown-menu {
        min-width: 160px;
        right: -10px;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    .cb-header .language-switcher .dropdown-menu {
        background: #2d3748;
        border: 1px solid #4a5568;
    }
    
    .cb-header .language-switcher .dropdown-menu li a {
        color: #e2e8f0;
    }
    
    .cb-header .language-switcher .dropdown-menu li a:hover,
    .cb-header .language-switcher .dropdown-menu li a:focus {
        background: linear-gradient(135deg, #4299e1 0%, #3182ce 100%);
        color: #fff;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    .cb-header .language-switcher .dropdown-toggle {
        border: 2px solid currentColor;
    }
    
    .cb-header .language-switcher .dropdown-menu {
        border: 2px solid #333;
    }
    
    .cb-header .language-switcher .dropdown-menu li a:hover,
    .cb-header .language-switcher .dropdown-menu li a:focus {
        background: #000;
        color: #fff;
        border: 2px solid #fff;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .cb-header .language-switcher .dropdown-toggle,
    .cb-header .language-switcher .flag-icon,
    .cb-header .language-switcher .caret,
    .cb-header .language-switcher .dropdown-menu,
    .cb-header .language-switcher .dropdown-menu li a {
        transition: none;
        animation: none;
        transform: none;
    }
    
    .cb-header .language-switcher .dropdown-menu {
        animation: none;
    }
}

/* Print styles */
@media print {
    .cb-header .language-switcher {
        display: none !important;
    }
}

/* Performance optimizations */
.cb-header .language-switcher * {
    box-sizing: border-box;
}

/* GPU acceleration for smooth animations */
.cb-header .language-switcher .dropdown-menu,
.cb-header .language-switcher .dropdown-toggle {
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-10px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.6;
        transform: scale(1);
    }
    50% {
        opacity: 1;
        transform: scale(1.05);
    }
}

/* Integration with existing header styles */
.cb-header .navbar-nav > li > .language-switcher {
    display: block;
}

/* Ensure proper z-index stacking */
.cb-header {
    z-index: 1030;
}

.cb-header .language-switcher .dropdown-menu {
    z-index: 1031;
}

/* Focus management for accessibility */
.cb-header .language-switcher .dropdown-toggle:focus {
    z-index: 1032;
}

/* Smooth scrolling for mobile dropdown */
.navbar-collapse .language-switcher .dropdown-menu {
    -webkit-overflow-scrolling: touch;
    overflow-y: auto;
    max-height: 60vh;
}

/* Advanced Header Features */

/* Smart scroll behavior */
.cb-header {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform, box-shadow;
}

.cb-header.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(20px);
}

.cb-header.header-hidden {
    transform: translateY(-100%);
}

/* Stagger animations for dropdown items */
.cb-header .language-switcher.open .dropdown-menu li a {
    animation: slideInStagger 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55) forwards;
    opacity: 0;
    transform: translateY(-10px);
}

.cb-header .language-switcher.open .dropdown-menu li:nth-child(1) a {
    animation-delay: 0ms;
}

.cb-header .language-switcher.open .dropdown-menu li:nth-child(2) a {
    animation-delay: 50ms;
}

/* Micro-interactions */
.cb-header .language-switcher .dropdown-toggle {
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.cb-header .language-switcher .dropdown-toggle:active {
    transform: translateY(1px) scale(0.98);
}

/* Touch gesture indicators */
.cb-header .language-switcher.touch-device::after {
    content: '';
    position: absolute;
    top: -2px;
    right: -2px;
    width: 6px;
    height: 6px;
    background: #3498db;
    border-radius: 50%;
    opacity: 0.7;
    animation: pulse 2s infinite;
}

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

/* Focus indicators for better accessibility */
.cb-header .language-switcher .dropdown-toggle:focus-visible {
    outline: 3px solid #3498db;
    outline-offset: 2px;
    box-shadow: 0 0 0 6px rgba(52, 152, 219, 0.2);
}

.cb-header .language-switcher .dropdown-menu a:focus-visible {
    outline: 2px solid #3498db;
    outline-offset: -2px;
    box-shadow: inset 0 0 0 2px rgba(52, 152, 219, 0.2);
}

/* Loading states */
.cb-header .language-switcher.loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    border-radius: inherit;
    animation: shimmer 1.5s infinite;
}

/* Performance optimizations */
.cb-header .language-switcher,
.cb-header .language-switcher * {
    will-change: auto;
}

.cb-header .language-switcher.animating,
.cb-header .language-switcher.animating * {
    will-change: transform, opacity;
}

/* Hover state optimizations */
@media (hover: hover) {
    .cb-header .language-switcher .dropdown-toggle:hover {
        transform: translateY(-1px);
    }
    
    .cb-header .language-switcher .dropdown-menu li a:hover {
        transform: translateX(3px);
    }
}

/* Touch device optimizations */
@media (hover: none) {
    .cb-header .language-switcher .dropdown-toggle:hover {
        transform: none;
    }
    
    .cb-header .language-switcher .dropdown-menu li a:hover {
        transform: none;
    }
    
    /* Larger touch targets on touch devices */
    .cb-header .language-switcher .dropdown-toggle {
        min-height: 48px;
        padding: 12px 16px;
    }
    
    .cb-header .language-switcher .dropdown-menu li a {
        min-height: 48px;
        padding: 14px 20px;
    }
}

/* Advanced animations */
@keyframes slideInStagger {
    from {
        opacity: 0;
        transform: translateY(-10px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes shimmer {
    0% {
        background-position: -200px 0;
    }
    100% {
        background-position: calc(200px + 100%) 0;
    }
}

/* High performance mode for older devices */
@media (max-resolution: 1dppx) {
    .cb-header .language-switcher .dropdown-toggle,
    .cb-header .language-switcher .dropdown-menu,
    .cb-header .language-switcher .dropdown-menu li a {
        transition: none;
        animation: none;
        transform: none;
    }
}

/* Prefers reduced motion - respect user preferences */
@media (prefers-reduced-motion: reduce) {
    .cb-header.scrolled {
        transition: box-shadow 0.1s ease;
    }
    
    .cb-header.header-hidden {
        transition: transform 0.1s ease;
    }
    
    .cb-header .language-switcher.open .dropdown-menu li a {
        animation: none;
        opacity: 1;
        transform: none;
    }
}

/* Dark mode enhancements */
@media (prefers-color-scheme: dark) {
    .cb-header.scrolled {
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    }
    
    .cb-header .language-switcher .dropdown-toggle:focus-visible {
        box-shadow: 0 0 0 6px rgba(100, 181, 246, 0.3);
    }
}

/* Print optimizations */
@media print {
    .cb-header .language-switcher {
        display: none !important;
    }
    
    .cb-header.scrolled,
    .cb-header.header-hidden {
        transform: none !important;
        box-shadow: none !important;
    }
}

/* Container queries support (future-proofing) */
@supports (container-type: inline-size) {
    .cb-header {
        container-type: inline-size;
    }
    
    @container (max-width: 768px) {
        .cb-header .language-switcher .dropdown-toggle {
            font-size: 0.9em;
        }
    }
}