/* ==========================================================================
   Project: Reaper Co. Website
   Primary Creator: Eric Erdman (KillerReaper)
   Development Support: AI-assisted development using ChatGPT and Google Antigravity
   File: shared/nav/mobile-nav.css
   Purpose: Shared styles for responsive mobile navigation across all Technology Archive pages
   Last Reviewed: September 10, 2026
   Important Dependencies: None (pure CSS; loaded alongside shared/nav/mobile-nav.js)
   Access Level: Public (shared across public Technology Archive pages)
   Maintenance Notes:
     - Breakpoint is 900px. Below 900px, desktop nav is hidden ONLY when .mobile-nav-ready is present.
     - When JS is disabled or fails, .mobile-nav-ready is absent and the desktop nav remains visible
       as a horizontally scrollable container with touch targets >= 44px (progressive enhancement).
     - The mobile drawer uses touch-action: pan-y and overscroll-behavior: contain so mobile touch scrolling works.
     - All interactive controls maintain a minimum 44x44px touch target.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Design Tokens & Color Palette
   -------------------------------------------------------------------------- */
:root {
  --mn-cyan: #68e5ff;
  --mn-blue: #7488ff;
  --mn-violet: #b57aff;
  --mn-ink: #eff4ff;
  --mn-muted: #9eabc8;
  --mn-bg: rgba(6, 10, 23, 0.96);
  --mn-line: rgba(145, 166, 216, 0.18);
  --mn-focus: #68e5ff;
}

/* --------------------------------------------------------------------------
   1. Header Integration & Layout
   -------------------------------------------------------------------------- */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-self: end;
}

/* Ensure existing login button has minimum 44px tap target */
.site-header .login {
  min-height: 44px;
  padding: 10px 18px;
  box-sizing: border-box;
}

/* --------------------------------------------------------------------------
   2. Toggle Button (Hidden by default; enabled only when JS is ready)
   -------------------------------------------------------------------------- */
.mobile-nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  min-width: 44px;
  padding: 8px 14px;
  border: 1px solid rgba(104, 229, 255, 0.38);
  border-radius: 9px;
  background: rgba(104, 229, 255, 0.08);
  color: var(--mn-ink);
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  touch-action: manipulation;
  transition: background 0.18s ease, border-color 0.18s ease, transform 0.15s ease;
  user-select: none;
  -webkit-user-select: none;
}

.mobile-nav-toggle:hover {
  background: rgba(104, 229, 255, 0.16);
  border-color: var(--mn-cyan);
}

.mobile-nav-toggle:focus-visible {
  outline: 2px solid var(--mn-focus);
  outline-offset: 3px;
}

.mobile-nav-toggle-icon {
  position: relative;
  display: inline-block;
  width: 18px;
  height: 14px;
  flex-shrink: 0;
}

.mobile-nav-toggle-bar {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background-color: var(--mn-cyan);
  transition: transform 0.24s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.18s ease, top 0.24s ease;
}

.mobile-nav-toggle-bar:nth-child(1) {
  top: 0;
}

.mobile-nav-toggle-bar:nth-child(2) {
  top: 6px;
}

.mobile-nav-toggle-bar:nth-child(3) {
  top: 12px;
}

/* Animated transform when active/open */
.mobile-nav-toggle[aria-expanded="true"] .mobile-nav-toggle-bar:nth-child(1) {
  top: 6px;
  transform: rotate(45deg);
}

.mobile-nav-toggle[aria-expanded="true"] .mobile-nav-toggle-bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0.2);
}

.mobile-nav-toggle[aria-expanded="true"] .mobile-nav-toggle-bar:nth-child(3) {
  top: 6px;
  transform: rotate(-45deg);
}

/* --------------------------------------------------------------------------
   3. Backdrop Overlay
   -------------------------------------------------------------------------- */
.mobile-nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: 998;
  background: rgba(2, 4, 10, 0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.mobile-nav-backdrop.is-visible {
  opacity: 1;
  pointer-events: auto;
}

/* --------------------------------------------------------------------------
   4. Mobile Drawer Panel
   -------------------------------------------------------------------------- */
.mobile-nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 999;
  display: flex;
  flex-direction: column;
  width: min(390px, calc(100vw - 28px));
  height: 100vh;
  height: 100dvh;
  max-width: 100vw;
  box-sizing: border-box;
  padding: max(18px, env(safe-area-inset-top)) max(20px, env(safe-area-inset-right)) max(24px, env(safe-area-inset-bottom)) max(20px, env(safe-area-inset-left));
  background: var(--mn-bg);
  border-left: 1px solid var(--mn-line);
  box-shadow: -12px 0 50px rgba(0, 0, 0, 0.6);
  transform: translateX(105%);
  transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  touch-action: pan-y;
  overscroll-behavior: contain;
  color: var(--mn-ink);
  font-family: Arial, Helvetica, sans-serif;
}

.mobile-nav-drawer.is-open {
  transform: translateX(0);
}

/* Prevent background scrolling while open */
html.mobile-nav-open,
body.mobile-nav-open {
  overflow: hidden !important;
}

/* --------------------------------------------------------------------------
   5. Drawer Header & Close Button
   -------------------------------------------------------------------------- */
.mobile-nav-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--mn-line);
}

.mobile-nav-kicker {
  color: var(--mn-cyan);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin: 0 0 4px;
}

.mobile-nav-drawer-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--mn-ink);
}

.mobile-nav-close-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  border: 1px solid var(--mn-line);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--mn-ink);
  font-size: 1.25rem;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
  transition: background 0.18s ease, border-color 0.18s ease;
}

.mobile-nav-close-btn:hover {
  background: rgba(104, 229, 255, 0.14);
  border-color: var(--mn-cyan);
  color: var(--mn-cyan);
}

.mobile-nav-close-btn:focus-visible {
  outline: 2px solid var(--mn-focus);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   6. Current Page Status Banner
   -------------------------------------------------------------------------- */
.mobile-nav-current-banner {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 18px 0 16px;
  padding: 10px 14px;
  border: 1px solid rgba(104, 229, 255, 0.22);
  border-radius: 10px;
  background: rgba(104, 229, 255, 0.05);
  font-size: 0.82rem;
  color: var(--mn-muted);
}

.mobile-nav-current-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--mn-cyan);
  box-shadow: 0 0 10px var(--mn-cyan);
  flex-shrink: 0;
}

.mobile-nav-current-banner strong {
  color: var(--mn-cyan);
  font-weight: 750;
}

/* --------------------------------------------------------------------------
   7. Links List
   -------------------------------------------------------------------------- */
.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1 0 auto;
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 50px;
  padding: 12px 16px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.025);
  color: var(--mn-ink);
  font-size: 1rem;
  font-weight: 750;
  text-decoration: none;
  touch-action: manipulation;
  transition: background 0.16s ease, border-color 0.16s ease, color 0.16s ease, transform 0.16s ease;
}

.mobile-nav-link:hover {
  background: rgba(104, 229, 255, 0.08);
  border-color: rgba(104, 229, 255, 0.28);
  color: var(--mn-cyan);
  transform: translateX(3px);
}

.mobile-nav-link:focus-visible {
  outline: 2px solid var(--mn-focus);
  outline-offset: 2px;
}

.mobile-nav-link.active {
  background: linear-gradient(135deg, rgba(104, 229, 255, 0.16), rgba(116, 136, 255, 0.1));
  border-color: rgba(104, 229, 255, 0.45);
  color: var(--mn-cyan);
  box-shadow: 0 4px 20px rgba(104, 229, 255, 0.08);
}

.mobile-nav-link-name {
  display: flex;
  align-items: center;
  gap: 10px;
}

.mobile-nav-link-pill {
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: 999px;
  background: rgba(104, 229, 255, 0.18);
  color: var(--mn-cyan);
}

.mobile-nav-link-arrow {
  color: var(--mn-muted);
  font-size: 1rem;
  transition: transform 0.18s ease, color 0.18s ease;
}

.mobile-nav-link:hover .mobile-nav-link-arrow,
.mobile-nav-link.active .mobile-nav-link-arrow {
  color: var(--mn-cyan);
  transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   8. Drawer Footer (Hub & Login Actions)
   -------------------------------------------------------------------------- */
.mobile-nav-drawer-footer {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--mn-line);
}

.mobile-nav-hub-link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 10px 16px;
  border: 1px solid var(--mn-line);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.035);
  color: var(--mn-muted);
  font-size: 0.88rem;
  font-weight: 750;
  text-decoration: none;
  touch-action: manipulation;
  transition: background 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.mobile-nav-hub-link:hover {
  background: rgba(255, 255, 255, 0.07);
  color: var(--mn-ink);
  border-color: rgba(255, 255, 255, 0.2);
}

.mobile-nav-hub-link:focus-visible {
  outline: 2px solid var(--mn-focus);
  outline-offset: 2px;
}

.mobile-nav-drawer-login {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 16px;
  border: 1px solid rgba(104, 229, 255, 0.34);
  border-radius: 10px;
  background: rgba(104, 229, 255, 0.09);
  color: var(--mn-ink);
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 800;
  cursor: pointer;
  touch-action: manipulation;
  transition: background 0.16s ease, border-color 0.16s ease;
}

.mobile-nav-drawer-login:hover {
  background: rgba(104, 229, 255, 0.18);
  border-color: var(--mn-cyan);
}

.mobile-nav-drawer-login:focus-visible {
  outline: 2px solid var(--mn-focus);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   9. Progressive Enhancement & Breakpoint Media Queries
   -------------------------------------------------------------------------- */

/* Active state: JS is ready and viewport <= 900px */
@media (max-width: 900px) {
  .mobile-nav-ready .site-header .main-nav {
    display: none !important;
  }
  .mobile-nav-ready .mobile-nav-toggle {
    display: inline-flex !important;
  }
  .mobile-nav-ready .site-header {
    grid-template-columns: 1fr auto !important;
    gap: 12px !important;
  }
}

/* Desktop: viewport > 900px */
@media (min-width: 901px) {
  .mobile-nav-toggle {
    display: none !important;
  }
  .mobile-nav-drawer,
  .mobile-nav-backdrop {
    display: none !important;
  }
}

/* Fallback: when JS fails or is blocked (html does NOT have .mobile-nav-ready)
   The desktop .main-nav remains visible and horizontally scrollable on mobile! */
@media (max-width: 900px) {
  html:not(.mobile-nav-ready) .site-header {
    grid-template-columns: 1fr !important;
    gap: 12px !important;
    padding-bottom: 12px !important;
  }
  html:not(.mobile-nav-ready) .site-header .main-nav {
    display: flex !important;
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch;
    white-space: nowrap !important;
    scrollbar-width: thin;
    max-width: 100% !important;
    padding: 6px 2px 8px !important;
    justify-content: flex-start !important;
    gap: 16px !important;
  }
  html:not(.mobile-nav-ready) .site-header .main-nav a {
    flex-shrink: 0;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }
}