/**
 * UNIFIED MOBILE NAVIGATION CSS
 *
 * Consistent mobile navigation design across all pages
 * WCAG 2.1 AA compliant, touch-friendly, accessible
 */

/* ================================
   MOBILE BOTTOM NAVIGATION
   ================================ */

.mobile-bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  display: none;
}

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

  /* Add padding to body to prevent content hiding behind nav */
  body {
    padding-bottom: calc(80px + env(safe-area-inset-bottom, 0px));
  }
}

.mobile-bottom-nav__inner {
  display: flex;
  justify-content: space-around;
  align-items: center;
  height: 80px;
  max-width: 100%;
  padding: 0 8px;
  gap: 4px;
}

.mobile-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: #666;
  padding: 8px 12px;
  border-radius: 12px;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  min-width: 64px;
  min-height: 64px;
  position: relative;
  outline-offset: 2px;
}

.mobile-nav-item:hover,
.mobile-nav-item:focus {
  background: rgba(0, 120, 215, 0.08);
  color: #0078d7;
  outline: 2px solid #0078d7;
}

.mobile-nav-item.active {
  color: #0078d7;
  background: rgba(0, 120, 215, 0.1);
}

.mobile-nav-item.active::after {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 32px;
  height: 3px;
  background: #0078d7;
  border-radius: 0 0 3px 3px;
}

.mobile-nav-item__icon {
  font-size: 24px;
  margin-bottom: 4px;
  line-height: 1;
}

.mobile-nav-item__label {
  font-size: 11px;
  font-weight: 500;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

/* ================================
   HAMBURGER MENU (for additional items)
   ================================ */

.hamburger-menu,
.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  padding: 12px;
  cursor: pointer;
  outline-offset: 2px;
  min-width: 44px;
  min-height: 44px;
  border-radius: 8px;
}

@media (max-width: 768px) {
  .hamburger-menu,
  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }
}

.hamburger-menu:hover,
.hamburger-menu:focus,
.nav-toggle:hover,
.nav-toggle:focus {
  background: rgba(0, 0, 0, 0.05);
  outline: 2px solid #0078d7;
}

.hamburger-menu span,
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #333;
  border-radius: 2px;
  transition: all 0.3s ease;
  position: relative;
}

.hamburger-menu span::before,
.hamburger-menu span::after,
.nav-toggle span::before,
.nav-toggle span::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 2px;
  background: #333;
  border-radius: 2px;
  transition: all 0.3s ease;
}

.hamburger-menu span::before,
.nav-toggle span::before {
  top: -8px;
}

.hamburger-menu span::after,
.nav-toggle span::after {
  bottom: -8px;
}

/* Animated hamburger when menu is open */
.hamburger-menu[aria-expanded="true"] span,
.nav-toggle[aria-expanded="true"] span {
  background: transparent;
}

.hamburger-menu[aria-expanded="true"] span::before,
.nav-toggle[aria-expanded="true"] span::before {
  top: 0;
  transform: rotate(45deg);
}

.hamburger-menu[aria-expanded="true"] span::after,
.nav-toggle[aria-expanded="true"] span::after {
  bottom: 0;
  transform: rotate(-45deg);
}

/* ================================
   MOBILE MENU OVERLAY
   ================================ */

@media (max-width: 768px) {
  .sidebar.mobile-open,
  .main-nav.mobile-open,
  nav[role="navigation"].mobile-open {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: white;
    z-index: 999;
    overflow-y: auto;
    padding: 80px 20px 100px;
    animation: slideInFromLeft 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }
}

@keyframes slideInFromLeft {
  from {
    transform: translateX(-100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* ================================
   RESPONSIVE ADJUSTMENTS
   ================================ */

/* Extra small devices (phones, less than 360px) */
@media (max-width: 360px) {
  .mobile-nav-item__label {
    font-size: 10px;
  }

  .mobile-nav-item__icon {
    font-size: 20px;
  }

  .mobile-bottom-nav__inner {
    height: 72px;
    padding: 0 4px;
  }
}

/* Larger phones (360px - 414px) */
@media (min-width: 361px) and (max-width: 414px) {
  .mobile-nav-item {
    min-width: 70px;
  }
}

/* Tablets in portrait */
@media (min-width: 768px) and (max-width: 1024px) and (orientation: portrait) {
  .mobile-bottom-nav {
    display: block;
  }

  .mobile-nav-item {
    min-width: 80px;
  }

  .mobile-nav-item__label {
    font-size: 12px;
  }
}

/* ================================
   DARK MODE SUPPORT
   ================================ */

@media (prefers-color-scheme: dark) {
  .mobile-bottom-nav {
    background: rgba(30, 30, 30, 0.98);
    border-top-color: rgba(255, 255, 255, 0.1);
  }

  .mobile-nav-item {
    color: #ccc;
  }

  .mobile-nav-item:hover,
  .mobile-nav-item:focus {
    background: rgba(0, 120, 215, 0.15);
    color: #4dabf7;
  }

  .mobile-nav-item.active {
    color: #4dabf7;
    background: rgba(0, 120, 215, 0.2);
  }

  .mobile-nav-item.active::after {
    background: #4dabf7;
  }

  .hamburger-menu span,
  .hamburger-menu span::before,
  .hamburger-menu span::after,
  .nav-toggle span,
  .nav-toggle span::before,
  .nav-toggle span::after {
    background: #fff;
  }

  .sidebar.mobile-open,
  .main-nav.mobile-open {
    background: #1a1a1a;
  }
}

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

@media (prefers-contrast: high) {
  .mobile-nav-item {
    border: 2px solid transparent;
  }

  .mobile-nav-item:hover,
  .mobile-nav-item:focus {
    border-color: #0078d7;
    background: white;
  }

  .mobile-nav-item.active {
    border-color: #0078d7;
    background: white;
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .mobile-nav-item,
  .hamburger-menu span,
  .hamburger-menu span::before,
  .hamburger-menu span::after,
  .nav-toggle span,
  .nav-toggle span::before,
  .nav-toggle span::after,
  .sidebar.mobile-open,
  .main-nav.mobile-open {
    transition: none;
    animation: none;
  }
}

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

@media print {
  .mobile-bottom-nav,
  .hamburger-menu,
  .nav-toggle {
    display: none !important;
  }
}

/* ================================
   SCREEN READER ONLY
   ================================ */

.sr-only,
#mobile-nav-live-region {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}