/**
 * Navigation UX Polish - Comprehensive Enhancements
 *
 * Features:
 * - Page transition animations
 * - Enhanced active state indicators
 * - Scroll-to-top button
 * - Keyboard shortcuts hint
 * - Enhanced footer navigation
 * - Improved mobile navigation UX
 * - Focus management for accessibility
 *
 * Last updated: 2026-01-10
 */

/* ============================================
   PAGE TRANSITION ANIMATIONS
   ============================================ */

/* Exit transition - fade out and slide up */
.spa-transition-exit {
    opacity: 1;
    transform: translateY(0);
}

.spa-transition-exit-active {
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 0.2s ease-out, transform 0.2s ease-out;
}

/* Enter transition - fade in and slide up from below */
.spa-transition-enter {
    opacity: 0;
    transform: translateY(12px);
}

.spa-transition-enter-active {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1), transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Page content fade */
#main-content {
    transition: opacity 0.2s ease;
}

#main-content.loading-transition {
    opacity: 0.6;
    pointer-events: none;
}

/* ============================================
   NAVIGATION ACTIVE STATE INDICATORS
   ============================================ */

/* Desktop navigation with enhanced active states */
.main-nav .nav-link {
    position: relative;
    overflow: hidden;
}

/* Animated underline indicator */
.main-nav .nav-link::before {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary, #8b7fff), var(--color-secondary, #ff7eb6));
    border-radius: 2px;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1), left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.main-nav .nav-link:hover::before,
.main-nav .nav-link:focus::before {
    width: 60%;
    left: 20%;
}

.main-nav .nav-link.active::before {
    width: 80%;
    left: 10%;
    background: var(--color-primary, #8b7fff);
    box-shadow: 0 0 8px rgba(var(--color-primary-rgb, 139, 127, 255), 0.5);
}

/* Active state highlight background */
.main-nav .nav-link.active {
    color: var(--color-primary, #8b7fff);
    background: rgba(var(--color-primary-rgb, 139, 127, 255), 0.1);
}

/* Glow effect for active items */
.main-nav .nav-link.active::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 8px;
    box-shadow: inset 0 0 10px rgba(var(--color-primary-rgb, 139, 127, 255), 0.15);
    pointer-events: none;
}

/* Mobile nav active states */
.mobile-nav-link.active {
    background: rgba(var(--color-primary-rgb, 139, 127, 255), 0.15) !important;
    border-left: 3px solid var(--color-primary, #8b7fff);
    padding-left: calc(1rem - 3px);
}

.mobile-nav-link.active .mobile-nav-link-icon {
    color: var(--color-primary, #8b7fff);
}

/* ============================================
   SCROLL-TO-TOP BUTTON
   ============================================ */

.scroll-to-top-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    background: rgba(var(--color-bg-card-rgb, 26, 31, 58), 0.95);
    border: 1px solid rgba(var(--color-border-primary-rgb, 42, 47, 74), 0.8);
    border-radius: 50%;
    color: var(--color-text-primary, #f8f9fa);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px) scale(0.9);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.scroll-to-top-btn.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.scroll-to-top-btn:hover {
    background: rgba(var(--color-primary-rgb, 139, 127, 255), 0.2);
    border-color: var(--color-primary, #8b7fff);
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 6px 24px rgba(var(--color-primary-rgb, 139, 127, 255), 0.3);
}

.scroll-to-top-btn:active {
    transform: translateY(0) scale(1);
}

.scroll-to-top-btn:focus-visible {
    outline: 2px solid var(--color-primary, #8b7fff);
    outline-offset: 3px;
}

.scroll-to-top-btn svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    stroke-width: 2;
    fill: none;
    transition: transform 0.2s ease;
}

.scroll-to-top-btn:hover svg {
    transform: translateY(-2px);
}

/* Ripple effect on click */
.scroll-to-top-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: rgba(var(--color-primary-rgb, 139, 127, 255), 0.3);
    transform: scale(0);
    transition: transform 0.4s ease;
}

.scroll-to-top-btn:active::before {
    transform: scale(1);
    opacity: 0;
}

/* Mobile positioning */
@media (max-width: 768px) {
    .scroll-to-top-btn {
        bottom: 1.5rem;
        right: 1.5rem;
        width: 44px;
        height: 44px;
    }
}

/* ============================================
   KEYBOARD SHORTCUTS HINT
   ============================================ */

.keyboard-shortcuts-hint {
    position: fixed;
    bottom: 2rem;
    left: 2rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.875rem;
    background: rgba(var(--color-bg-card-rgb, 26, 31, 58), 0.95);
    border: 1px solid rgba(var(--color-border-primary-rgb, 42, 47, 74), 0.6);
    border-radius: 8px;
    color: var(--color-text-muted, #6c757d);
    font-size: 0.75rem;
    z-index: 9000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    cursor: pointer;
}

.keyboard-shortcuts-hint.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.keyboard-shortcuts-hint:hover {
    color: var(--color-text-secondary, #adb5bd);
    border-color: rgba(var(--color-primary-rgb, 139, 127, 255), 0.4);
}

.keyboard-shortcuts-hint kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    padding: 0.125rem 0.375rem;
    background: rgba(var(--color-bg-secondary-rgb, 21, 26, 53), 0.8);
    border: 1px solid rgba(var(--color-border-primary-rgb, 42, 47, 74), 0.6);
    border-radius: 4px;
    font-family: 'SF Mono', 'Consolas', monospace;
    font-size: 0.6875rem;
    color: var(--color-text-secondary, #adb5bd);
}

.keyboard-shortcuts-hint-icon {
    width: 14px;
    height: 14px;
    opacity: 0.7;
}

/* Keyboard shortcuts modal */
.keyboard-shortcuts-modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10001;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
}

.keyboard-shortcuts-modal.visible {
    opacity: 1;
    visibility: visible;
}

.keyboard-shortcuts-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.keyboard-shortcuts-modal-content {
    position: relative;
    width: 90%;
    max-width: 420px;
    max-height: 80vh;
    overflow-y: auto;
    background: rgba(var(--color-bg-card-rgb, 26, 31, 58), 0.98);
    border: 1px solid rgba(var(--color-border-primary-rgb, 42, 47, 74), 0.8);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    transform: translateY(20px) scale(0.95);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.keyboard-shortcuts-modal.visible .keyboard-shortcuts-modal-content {
    transform: translateY(0) scale(1);
}

.keyboard-shortcuts-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid rgba(var(--color-border-primary-rgb, 42, 47, 74), 0.5);
}

.keyboard-shortcuts-modal-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-primary, #f8f9fa);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.keyboard-shortcuts-modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(var(--color-bg-secondary-rgb, 21, 26, 53), 0.6);
    border: 1px solid rgba(var(--color-border-primary-rgb, 42, 47, 74), 0.4);
    border-radius: 6px;
    color: var(--color-text-secondary, #adb5bd);
    cursor: pointer;
    transition: all 0.2s ease;
}

.keyboard-shortcuts-modal-close:hover {
    background: rgba(255, 100, 100, 0.2);
    border-color: rgba(255, 100, 100, 0.4);
    color: #ff6b6b;
}

.keyboard-shortcuts-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.keyboard-shortcut-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.625rem 0.75rem;
    background: rgba(var(--color-bg-secondary-rgb, 21, 26, 53), 0.4);
    border-radius: 8px;
    transition: background 0.15s ease;
}

.keyboard-shortcut-item:hover {
    background: rgba(var(--color-primary-rgb, 139, 127, 255), 0.08);
}

.keyboard-shortcut-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary, #adb5bd);
}

.keyboard-shortcut-keys {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.keyboard-shortcut-keys kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    padding: 0.25rem 0.5rem;
    background: rgba(var(--color-bg-card-rgb, 26, 31, 58), 0.8);
    border: 1px solid rgba(var(--color-border-primary-rgb, 42, 47, 74), 0.6);
    border-radius: 4px;
    font-family: 'SF Mono', 'Consolas', monospace;
    font-size: 0.75rem;
    color: var(--color-text-primary, #f8f9fa);
    box-shadow: 0 2px 0 rgba(0, 0, 0, 0.2);
}

.keyboard-shortcut-keys .key-plus {
    color: var(--color-text-muted, #6c757d);
    font-size: 0.75rem;
}

/* Hide on mobile */
@media (max-width: 768px) {
    .keyboard-shortcuts-hint {
        display: none;
    }
}

/* ============================================
   ENHANCED FOOTER NAVIGATION
   ============================================ */

.site-footer {
    background: linear-gradient(180deg,
        rgba(var(--color-bg-secondary-rgb, 21, 26, 53), 0.95) 0%,
        rgba(var(--color-bg-primary-rgb, 10, 14, 39), 1) 100%);
    border-top: 1px solid rgba(var(--color-border-primary-rgb, 42, 47, 74), 0.6);
    padding: 3rem 2rem 2rem;
    margin-top: 4rem;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
}

/* Footer sitemap grid */
.footer-sitemap {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid rgba(var(--color-border-primary-rgb, 42, 47, 74), 0.4);
}

.footer-section {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-section-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-primary, #8b7fff);
    margin-bottom: 0.25rem;
}

.footer-section-links {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.footer-section-link {
    color: var(--color-text-secondary, #adb5bd);
    text-decoration: none;
    font-size: 0.875rem;
    padding: 0.25rem 0;
    transition: color 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
}

.footer-section-link:hover {
    color: var(--color-text-primary, #f8f9fa);
}

.footer-section-link:focus-visible {
    outline: 2px solid var(--color-primary, #8b7fff);
    outline-offset: 2px;
    border-radius: 4px;
}

.footer-section-link svg {
    width: 14px;
    height: 14px;
    opacity: 0.7;
}

/* Footer bottom row */
.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-copyright {
    color: var(--color-text-muted, #6c757d);
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--color-text-secondary, #adb5bd);
    text-decoration: none;
    font-size: 0.875rem;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.footer-links a:hover {
    color: var(--color-primary, #8b7fff);
    background: rgba(var(--color-primary-rgb, 139, 127, 255), 0.08);
}

.footer-links a:focus-visible {
    outline: 2px solid var(--color-primary, #8b7fff);
    outline-offset: 2px;
}

/* Footer brand section */
.footer-brand-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2.5rem;
    padding-bottom: 2.5rem;
    border-bottom: 1px solid rgba(var(--color-border-primary-rgb, 42, 47, 74), 0.4);
}

.footer-brand {
    max-width: 400px;
}

.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    margin-bottom: 1rem;
}

.footer-logo-icon {
    color: var(--color-primary, #8b7fff);
    transition: transform 0.3s ease;
}

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

.footer-logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary, #8b7fff), var(--color-secondary, #ff7eb6));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-tagline {
    color: var(--color-text-secondary, #adb5bd);
    font-size: 0.9rem;
    line-height: 1.6;
    max-width: 350px;
}

/* Footer newsletter */
.footer-newsletter {
    max-width: 400px;
    justify-self: end;
}

.footer-newsletter-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary, #f8f9fa);
    margin-bottom: 0.5rem;
}

.footer-newsletter-desc {
    font-size: 0.875rem;
    color: var(--color-text-secondary, #adb5bd);
    margin-bottom: 1rem;
}

.footer-newsletter-form {
    display: flex;
    gap: 0.5rem;
}

.footer-newsletter-input {
    flex: 1;
    padding: 0.75rem 1rem;
    background: rgba(var(--color-bg-card-rgb, 26, 31, 58), 0.8);
    border: 1px solid rgba(var(--color-border-primary-rgb, 42, 47, 74), 0.6);
    border-radius: 10px;
    color: var(--color-text-primary, #f8f9fa);
    font-size: 0.9rem;
    font-family: inherit;
    transition: all 0.2s ease;
}

.footer-newsletter-input::placeholder {
    color: var(--color-text-muted, #6c757d);
}

.footer-newsletter-input:focus {
    outline: none;
    border-color: var(--color-primary, #8b7fff);
    box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb, 139, 127, 255), 0.15);
}

.footer-newsletter-btn {
    padding: 0.75rem 1.25rem;
    background: linear-gradient(135deg, var(--color-primary, #8b7fff), #a78bfa);
    border: none;
    border-radius: 10px;
    color: white;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.footer-newsletter-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(var(--color-primary-rgb, 139, 127, 255), 0.4);
}

.footer-newsletter-btn:focus-visible {
    outline: 2px solid var(--color-primary, #8b7fff);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(var(--color-primary-rgb, 139, 127, 255), 0.2);
}

.footer-newsletter-input:focus-visible {
    outline: none;
    border-color: var(--color-primary, #8b7fff);
    box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb, 139, 127, 255), 0.2);
}

/* Footer responsive adjustments */
@media (max-width: 768px) {
    .footer-brand-section {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-newsletter {
        justify-self: start;
    }
}

@media (max-width: 480px) {
    .footer-newsletter-form {
        flex-direction: column;
    }

    .footer-newsletter-btn {
        width: 100%;
    }
}

/* Footer social links */
.footer-social {
    display: flex;
    gap: 0.75rem;
}

.footer-social-link {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(var(--color-bg-card-rgb, 26, 31, 58), 0.5);
    border: 1px solid rgba(var(--color-border-primary-rgb, 42, 47, 74), 0.4);
    border-radius: 8px;
    color: var(--color-text-secondary, #adb5bd);
    text-decoration: none;
    transition: all 0.2s ease;
}

.footer-social-link:hover {
    background: rgba(var(--color-primary-rgb, 139, 127, 255), 0.15);
    border-color: rgba(var(--color-primary-rgb, 139, 127, 255), 0.4);
    color: var(--color-primary, #8b7fff);
    transform: translateY(-2px);
}

.footer-social-link svg {
    width: 18px;
    height: 18px;
}

/* Mobile footer */
@media (max-width: 768px) {
    .site-footer {
        padding: 2rem 1.5rem 1.5rem;
        margin-top: 3rem;
    }

    .footer-sitemap {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .footer-copyright {
        order: 1;
    }

    .footer-links {
        order: 0;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .site-footer {
        padding: 1.5rem 1rem;
    }

    .footer-sitemap {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .footer-section {
        align-items: center;
        text-align: center;
    }

    .footer-section-links {
        align-items: center;
    }

    .footer-links {
        gap: 1rem;
    }
}

/* ============================================
   NAVIGATION FOCUS MANAGEMENT
   ============================================ */

/* Focus ring for keyboard users */
body.keyboard-nav a:focus,
body.keyboard-nav button:focus {
    outline: 2px solid var(--color-primary, #8b7fff);
    outline-offset: 2px;
}

/* Skip link enhancement */
.skip-to-main:focus {
    animation: skipLinkPulse 0.6s ease-out;
}

@keyframes skipLinkPulse {
    0% {
        box-shadow: 0 0 0 0 rgba(var(--color-primary-rgb, 139, 127, 255), 0.4);
    }
    70% {
        box-shadow: 0 0 0 8px rgba(var(--color-primary-rgb, 139, 127, 255), 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(var(--color-primary-rgb, 139, 127, 255), 0);
    }
}

/* Focus visible headings (for screen reader focus) */
h1[tabindex="-1"]:focus,
h2[tabindex="-1"]:focus,
h3[tabindex="-1"]:focus,
h1[tabindex="-1"]:focus-visible,
h2[tabindex="-1"]:focus-visible,
h3[tabindex="-1"]:focus-visible {
    outline: none !important;
}

/* ============================================
   NAVIGATION LOADING STATES
   ============================================ */

/* Loading indicator for navigation */
.nav-loading-indicator {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg,
        transparent,
        var(--color-primary, #8b7fff),
        var(--color-secondary, #ff7eb6),
        transparent);
    z-index: 10000;
    transform: scaleX(0);
    transform-origin: left;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.nav-loading-indicator.active {
    opacity: 1;
    animation: navLoadingProgress 1.5s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

@keyframes navLoadingProgress {
    0% {
        transform: scaleX(0) translateX(-100%);
    }
    50% {
        transform: scaleX(0.5) translateX(0);
    }
    100% {
        transform: scaleX(0) translateX(100%);
    }
}

/* ============================================
   REDUCED MOTION SUPPORT
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    .spa-transition-exit,
    .spa-transition-exit-active,
    .spa-transition-enter,
    .spa-transition-enter-active {
        transition: none;
        transform: none;
    }

    .scroll-to-top-btn,
    .keyboard-shortcuts-hint,
    .keyboard-shortcuts-modal,
    .keyboard-shortcuts-modal-content,
    .nav-loading-indicator {
        transition: none;
        animation: none;
    }

    .scroll-to-top-btn.visible {
        transform: none;
    }

    .nav-loading-indicator.active {
        animation: none;
        transform: scaleX(0.3);
    }
}

/* ============================================
   HIGH CONTRAST MODE
   ============================================ */

@media (prefers-contrast: high) {
    .scroll-to-top-btn,
    .keyboard-shortcuts-hint {
        border-width: 2px;
        backdrop-filter: none;
        background: var(--color-bg-card, #1a1f3a);
    }

    .main-nav .nav-link::before {
        height: 3px;
    }

    .mobile-nav-link.active {
        border-left-width: 4px;
    }

    .footer-section-link:hover {
        text-decoration: underline;
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    .scroll-to-top-btn,
    .keyboard-shortcuts-hint,
    .keyboard-shortcuts-modal,
    .nav-loading-indicator {
        display: none !important;
    }
}