/* Mobile Overlay Menu - Enhanced with Accessibility and Animations */

/* CSS Custom Properties for Theming */
:root {
  --menu-timing: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --menu-backdrop: rgba(0, 0, 0, 0.4);
  --menu-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  --menu-radius: 12px;
  --menu-touch-size: 44px;
  --menu-spacing: 16px;
}

/* Hide mobile overlay and toggle on desktop */
@media (min-width: 992px) {
  .mobile-menu-overlay,
  .mobile-menu-toggle {
    display: none !important;
  }
}

/* Base Mobile Styles */
@media (max-width: 991px) {
  /* Prevent background scroll when menu open with iOS momentum scroll fix */
  body.no-scroll {
    overflow: hidden;
    position: fixed;
    width: 100%;
    height: 100vh;
    height: 100dvh;
  }
  
  /* iOS momentum scroll fix */
  body.no-scroll .mobile-menu-overlay {
    overflow-y: scroll;
    -webkit-overflow-scrolling: touch;
  }

  /* Safari bottom bar fix */
  @supports (-webkit-touch-callout: none) {
    body.no-scroll {
      height: -webkit-fill-available;
    }
  }

  /* Hide Bootstrap collapse nav to avoid duplicate menus */
  #navbarCollapse.collapse { display: none !important; }
  .navbar-toggler { display: none !important; }

  /* Toggle button (hamburger) with enhanced accessibility */
  .mobile-menu-toggle {
    appearance: none;
    border: 2px solid transparent;
    background: transparent;
    width: var(--menu-touch-size);
    height: var(--menu-touch-size);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    touch-action: manipulation;
    cursor: pointer;
    border-radius: var(--menu-radius);
    transition: background-color 0.2s ease;
  }

  .mobile-menu-toggle:focus-visible {
    outline: none;
    border-color: var(--bs-primary);
    box-shadow: 0 0 0 2px rgba(255, 107, 53, 0.4);
  }

  /* Enhanced touch feedback */
  @media (hover: hover) {
    .mobile-menu-toggle:hover {
      background-color: rgba(255, 107, 53, 0.1);
    }
  }

  .mobile-menu-toggle:active {
    background-color: rgba(255, 107, 53, 0.2);
  }

  .mobile-menu-icon {
    position: relative;
    width: 26px;
    height: 20px;
    display: inline-block;
  }

  .mobile-menu-icon .line {
    position: absolute;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--bs-primary);
    border-radius: 2px;
    transform-origin: center;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.2s ease,
                top 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .mobile-menu-icon .line:nth-child(1) {
    top: 0;
    transform-origin: top right;
  }

  .mobile-menu-icon .line:nth-child(2) {
    top: 9px;
    transition: transform 0.25s ease-in-out;
  }

  .mobile-menu-icon .line:nth-child(3) {
    top: 18px;
    transform-origin: bottom right;
  }

  /* Enhanced animation for toggle state */
  .mobile-menu-toggle[aria-expanded="true"] .line:nth-child(1) {
    top: 9px;
    transform: rotate(45deg);
  }

  .mobile-menu-toggle[aria-expanded="true"] .line:nth-child(2) {
    transform: scaleX(0);
    opacity: 0;
  }

  .mobile-menu-toggle[aria-expanded="true"] .line:nth-child(3) {
    top: 9px;
    transform: rotate(-45deg);
  }

  /* High contrast mode support */
  @media (forced-colors: active) {
    .mobile-menu-toggle {
      border: 2px solid ButtonText;
    }
    .mobile-menu-icon .line {
      background: ButtonText;
    }
  }

  /* Overlay root */
  .mobile-menu-overlay { position: fixed; inset: 0; z-index: 1100; display: none; }
  .mobile-menu-overlay.is-open { display: block; }
  .mobile-menu-scrim { position: absolute; inset: 0; background: rgba(0,0,0,.25); opacity: 0; transition: opacity .3s ease; }
  .mobile-menu-overlay.is-open .mobile-menu-scrim { opacity: 1; }

  /* Container (drawer) with enhanced animations and accessibility */
  .mobile-menu-container {
    position: absolute;
    inset: 0 0 0 20%;
    background: #fff;
    color: var(--bs-dark);
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform var(--menu-timing),
                visibility 0s linear var(--menu-timing);
    box-shadow: var(--menu-shadow);
    visibility: hidden;
    border-radius: var(--menu-radius) 0 0 var(--menu-radius);
    isolation: isolate;
    overflow: hidden;
  }

  @media (max-width: 480px) {
    .mobile-menu-container {
      inset: 0;
      border-radius: 0;
    }
  }

  .mobile-menu-overlay.is-open .mobile-menu-container {
    transform: translateX(0%);
    visibility: visible;
    transition-delay: 0s;
  }

  /* Enhanced backdrop with blur effect */
  .mobile-menu-backdrop {
    position: absolute;
    inset: 0;
    background: var(--menu-backdrop);
    opacity: 0;
    transition: opacity var(--menu-timing);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
    will-change: opacity;
  }

  .mobile-menu-overlay.is-open .mobile-menu-backdrop {
    opacity: 1;
  }

  @supports not (backdrop-filter: blur(4px)) {
    .mobile-menu-backdrop {
      background: rgba(0, 0, 0, 0.6);
    }
  }

  /* Top bar */
  .mobile-menu-topbar { display: flex; align-items: center; justify-content: space-between; padding: 16px; background: var(--bs-white); border-bottom: 1px solid #f1f1f1; }
  .mobile-logo { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; color: var(--bs-dark); font-weight: 700; }
  .mobile-logo i { color: var(--bs-primary); }
  .mobile-menu-close { width: 36px; height: 36px; border-radius: 8px; border: 0; background: var(--bs-light); display: inline-flex; align-items: center; justify-content: center; }
  .mobile-close-icon { position: relative; width: 18px; height: 18px; }
  .mobile-close-icon::before, .mobile-close-icon::after { content: ""; position: absolute; left: 0; right: 0; top: 8px; height: 2px; background: var(--bs-dark); }
  .mobile-close-icon::before { transform: rotate(45deg); }
  .mobile-close-icon::after { transform: rotate(-45deg); }

  /* Enhanced sliding viewport and panels with improved accessibility */
  .mobile-menu-viewport {
    position: relative;
    flex: 1;
    overflow: hidden;
    background: #fff;
    contain: layout size;
  }

  .mobile-panel {
    position: absolute;
    inset: 0;
    padding: var(--menu-spacing);
    overflow-y: auto;
    width: 100%;
    overscroll-behavior-y: contain;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--bs-primary) transparent;
  }

  .mobile-panel::-webkit-scrollbar {
    width: 6px;
  }

  .mobile-panel::-webkit-scrollbar-thumb {
    background: var(--bs-primary);
    border-radius: 3px;
  }

  .mobile-panel::-webkit-scrollbar-track {
    background: transparent;
  }

  .mobile-panel--main,
  .mobile-panel--submenu {
    transform: translateX(0);
    transition: transform var(--menu-timing),
                visibility 0s linear var(--menu-timing);
    background: #fff;
    visibility: hidden;
    will-change: transform;
  }

  .mobile-panel--submenu {
    transform: translateX(100%);
  }

  /* Panel transitions with visibility control */
  .mobile-menu-viewport[data-active="main"] .mobile-panel--main {
    transform: translateX(0);
    visibility: visible;
    transition-delay: 0s;
  }

  .mobile-menu-viewport[data-active="main"] .mobile-panel--submenu {
    transform: translateX(100%);
    visibility: hidden;
  }

  .mobile-menu-viewport[data-active="services"] .mobile-panel--main,
  .mobile-menu-viewport[data-active="industries"] .mobile-panel--main,
  .mobile-menu-viewport[data-active="about"] .mobile-panel--main {
    transform: translateX(-100%);
    visibility: hidden;
  }

  .mobile-menu-viewport[data-active="services"] .mobile-panel--submenu[data-panel="services"],
  .mobile-menu-viewport[data-active="industries"] .mobile-panel--submenu[data-panel="industries"],
  .mobile-menu-viewport[data-active="about"] .mobile-panel--submenu[data-panel="about"] {
    transform: translateX(0);
    visibility: visible;
    transition-delay: 0s;
  }

  /* Reduced motion preferences */
  @media (prefers-reduced-motion: reduce) {
    .mobile-panel--main,
    .mobile-panel--submenu {
      transition-duration: 0.1s;
    }
  }

  /* Only show active panel (safety for display) */
  .mobile-menu-viewport .mobile-panel { display: none; }
  .mobile-menu-viewport[data-active="main"] .mobile-panel--main { display: block; }
  .mobile-menu-viewport[data-active="services"] .mobile-panel--submenu[data-panel="services"] { display: block; }
  .mobile-menu-viewport[data-active="industries"] .mobile-panel--submenu[data-panel="industries"] { display: block; }
  .mobile-menu-viewport[data-active="about"] .mobile-panel--submenu[data-panel="about"] { display: block; }

  /* Main list with enhanced accessibility and touch interactions */
  .mobile-nav {
    margin-top: var(--menu-spacing);
  }

  .mobile-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: calc(var(--menu-spacing) * 0.5);
  }

  .mobile-link {
    width: 100%;
    text-align: left;
    padding: 16px;
    border-radius: var(--menu-radius);
    border: 1px solid var(--primary-light);
    background: #fff;
    color: var(--bs-dark);
    font-weight: 600;
    text-decoration: none;
    display: block;
    box-shadow: 0 2px 8px rgba(255, 107, 53, 0.04);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    min-height: var(--menu-touch-size);
    touch-action: manipulation;
    position: relative;
    z-index: 1;
  }

  .mobile-link:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.4);
  }

  .mobile-link.has-children {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-right: calc(var(--menu-spacing) * 1.5);
  }

  .mobile-link.has-children::after {
    content: "\203A";
    font-size: 18px;
    color: var(--bs-primary);
    transition: transform 0.2s ease;
    flex-shrink: 0;
    margin-left: var(--menu-spacing);
  }

  /* Enhanced touch feedback */
  @media (hover: hover) {
    .mobile-link:hover {
      background: var(--bs-primary);
      color: #fff;
      border-color: var(--bs-primary);
      transform: translateY(-1px);
      box-shadow: 0 4px 12px rgba(255, 107, 53, 0.15);
    }

    .mobile-link:hover::after {
      color: #fff;
      transform: translateX(4px);
    }
  }

  .mobile-link:active {
    transform: translateY(1px);
    box-shadow: 0 1px 4px rgba(255, 107, 53, 0.1);
  }

  /* High contrast mode support */
  @media (forced-colors: active) {
    .mobile-link {
      border: 2px solid ButtonText;
    }
    .mobile-link:focus-visible {
      outline: 2px solid ButtonText;
      outline-offset: 2px;
    }
  }

  /* Reduced motion */
  @media (prefers-reduced-motion: reduce) {
    .mobile-link {
      transition: background-color 0.1s linear;
      transform: none !important;
    }
  }

  /* CTA */
  .mobile-cta { margin-top: auto; padding-top: 16px; }
  .mobile-cta-btn { display: block; width: 100%; text-align: center; padding: 14px 18px; border-radius: 999px; background: var(--bs-primary); color: #fff; font-weight: 700; text-decoration: none; box-shadow: 0 8px 20px rgba(255,107,53,0.18); border: none; transition: background .2s; }
  .mobile-cta-btn:focus { outline: 3px solid var(--bs-primary); outline-offset: 2px; }
  .mobile-cta-btn:hover, .mobile-cta-btn:active { background: var(--primary-dark); }

  /* Submenu header */
  .submenu-header { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
  .submenu-back { appearance: none; border: 1px solid var(--primary-light); background: #fff; border-radius: 10px; padding: 8px 10px; display: inline-flex; align-items: center; gap: 8px; color: var(--bs-dark); font-weight: 600; transition: background .2s, color .2s, border .2s; }
  .submenu-back:focus { outline: 3px solid var(--bs-primary); outline-offset: 2px; }
  .submenu-back:hover, .submenu-back:active { background: var(--bs-primary); color: #fff; border-color: var(--bs-primary); }
  .submenu-title { margin: 0 0 0 auto; font-size: 1.1rem; font-weight: 700; color: var(--bs-primary); }

  /* Enhanced submenu list with improved accessibility and animations */
  .submenu-list {
    list-style: none;
    padding: 0;
    margin: var(--menu-spacing) 0 0;
    display: grid;
    grid-template-columns: 1fr;
    gap: calc(var(--menu-spacing) * 0.75);
    contain: content;
  }

  .submenu-item {
    display: grid;
    grid-template-columns: minmax(56px, auto) 1fr;
    gap: calc(var(--menu-spacing) * 0.75);
    padding: calc(var(--menu-spacing) * 0.75);
    border-radius: var(--menu-radius);
    border: 1px solid var(--primary-light);
    background: #fff;
    text-decoration: none;
    color: var(--bs-dark);
    align-items: center;
    box-shadow: 0 2px 8px rgba(255, 107, 53, 0.04);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    min-height: var(--menu-touch-size);
    touch-action: manipulation;
    will-change: transform, box-shadow;
  }

  .submenu-item:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.4);
  }

  @media (hover: hover) {
    .submenu-item:hover {
      background: var(--bs-primary);
      color: #fff;
      border-color: var(--bs-primary);
      transform: translateY(-2px);
      box-shadow: 0 8px 16px rgba(255, 107, 53, 0.15);
    }

    .submenu-item:hover .submenu-text h3,
    .submenu-item:hover .submenu-text p {
      color: #fff;
    }

    .submenu-item:hover .submenu-icon {
      border-color: rgba(255, 255, 255, 0.2);
      background: rgba(255, 255, 255, 0.1);
    }
  }

  .submenu-item:active {
    transform: translateY(1px);
    box-shadow: 0 1px 4px rgba(255, 107, 53, 0.1);
  }

  .submenu-icon {
    width: 56px;
    height: 56px;
    object-fit: contain;
    border-radius: calc(var(--menu-radius) * 0.75);
    background: #fff8f3;
    border: 1px solid #ffe2d6;
    padding: calc(var(--menu-spacing) * 0.5);
    transition: background 0.2s ease, border-color 0.2s ease;
  }

  .submenu-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
  }

  .submenu-text h3 {
    font-size: 1rem;
    margin: 0;
    font-weight: 700;
    color: var(--bs-primary);
    transition: color 0.2s ease;
  }

  .submenu-text p {
    font-size: 0.9rem;
    margin: 0;
    color: var(--bs-dark);
    transition: color 0.2s ease;
    opacity: 0.9;
  }

  /* High contrast mode support */
  @media (forced-colors: active) {
    .submenu-item {
      border: 2px solid ButtonText;
    }
    .submenu-icon {
      border: 1px solid ButtonText;
    }
  }

  /* Reduced motion */
  @media (prefers-reduced-motion: reduce) {
    .submenu-item {
      transition: background-color 0.1s linear;
      transform: none !important;
    }
  }

  /* Loading state */
  .submenu-item[aria-busy="true"]::before {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.8);
    border-radius: inherit;
    z-index: 1;
  }

  .submenu-item[aria-busy="true"]::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    width: 24px;
    height: 24px;
    margin: -12px 0 0 -12px;
    border: 2px solid var(--bs-primary);
    border-top-color: transparent;
    border-radius: 50%;
    z-index: 2;
    animation: submenu-loading 0.8s linear infinite;
  }

  @keyframes submenu-loading {
    to { transform: rotate(360deg); }
  }
}