/* ============================================
   MOBILE OPTIMIZATIONS V2 - JULY 2026
   Tech Lead Comprehensive Overhaul
   ============================================
   Fixes:
   - Removed duplicate code
   - Content-first layout
   - Natural document flow (no fixed positioning hell)
   - 48px minimum touch targets
   - Performance optimizations
============================================ */

/* ============================================
   1. BASE MOBILE STYLES
   ============================================ */

html {
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
}

/* Prevent horizontal scroll */
body, html {
  overflow-x: hidden !important;
  max-width: 100vw !important;
}

/* Touch-friendly tap targets - WCAG 2.1 AA compliant */
button, .btn, a.btn, input[type="submit"], input[type="button"] {
  min-width: 48px;
  min-height: 48px;
  padding: 12px 20px;
  font-size: 16px; /* Prevents zoom on iOS */
  cursor: pointer;
  touch-action: manipulation;
}

/* Prevent double-tap zoom on interactive elements */
a, button, input, select, textarea {
  touch-action: manipulation;
  -webkit-tap-highlight-color: rgba(0,0,0,0.1);
}

/* ============================================
   2. MOBILE BREAKPOINTS - CONTENT FIRST
   ============================================ */

@media (max-width: 768px) {
  /* ===== NAVIGATION COMPLETE OVERHAUL ===== */
  header {
    padding: 0.75rem 1rem !important;
    min-height: auto !important;
    flex-direction: column !important;
    gap: 0.75rem !important;
  }
  
  header h1 {
    font-size: 1.25rem !important;
    width: 100% !important;
    text-align: center !important;
  }
  
  header h1 a {
    display: block !important;
  }
  
  /* Navigation container - clean horizontal scroll */
  nav {
    display: flex !important;
    gap: 0.5rem !important;
    width: 100% !important;
    overflow-x: auto !important;
    overflow-y: hidden !important;
    -webkit-overflow-scrolling: touch !important;
    scrollbar-width: none !important; /* Firefox */
    padding: 0.25rem 0 !important;
    flex-wrap: nowrap !important;
  }
  
  /* Hide scrollbar */
  nav::-webkit-scrollbar {
    display: none !important;
  }
  
  /* Hide non-essential items EXCEPT profile/login/logout */
  nav a[href="/leaderboard"],
  nav a[href="/blog"],
  nav a[href="/metrics"],
  nav a[href="/guides"],
  nav a[href*="/category/"],
  nav a[href="/admin"],
  nav .streak-badge,
  nav .level-badge {
    display: none !important;
  }
  
  /* All nav items - consistent styling */
  nav a,
  nav button {
    flex-shrink: 0 !important;
    padding: 0.6rem 1rem !important;
    font-size: 0.9rem !important;
    white-space: nowrap !important;
    border-radius: 8px !important;
    min-height: 44px !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    font-weight: 600 !important;
  }
  
  /* Theme toggle buttons */
  nav button.dark-mode-toggle,
  nav button.sound-toggle {
    min-width: 44px !important;
    padding: 0.6rem !important;
    font-size: 1.2rem !important;
  }
  
  /* ===== CONTENT-FIRST LAYOUT ===== */
  /* Remove ALL fixed positioning - use natural flow */
  .meme-container {
    display: flex !important;
    flex-direction: column !important;
    min-height: calc(100vh - 60px) !important;
    position: relative !important;
    padding: 0 !important;
    margin: 0 !important;
    width: 100% !important;
    max-width: 100vw !important;
  }
  
  /* Meme display takes maximum space */
  .meme-display {
    flex: 1 !important;
    min-height: 50vh !important;
    max-height: 65vh !important;
    position: relative !important;
    width: 100% !important;
    background: #000 !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    padding: 0.5rem !important;
  }
  
  .meme-display img,
  .meme-display video {
    max-width: 100% !important;
    max-height: 100% !important;
    width: auto !important;
    height: auto !important;
    object-fit: contain !important;
  }
  
  /* ===== INFO SECTION - NATURAL FLOW ===== */
  .meme-info {
    position: relative !important;
    transform: none !important;
    bottom: auto !important;
    left: auto !important;
    width: 100% !important;
    max-width: 100% !important;
    padding: 1rem !important;
    background: var(--bg-primary, #fff) !important;
    color: var(--text-primary, #333) !important;
    backdrop-filter: none !important;
    box-shadow: none !important;
    border-radius: 0 !important;
  }
  
  .meme-info-header {
    display: flex !important;
    justify-content: space-between !important;
    align-items: flex-start !important;
    gap: 1rem !important;
  }
  
  .meme-title {
    font-size: 1rem !important;
    line-height: 1.4 !important;
    flex: 1 !important;
  }
  
  .title-toggle-btn {
    min-width: 48px !important;
    min-height: 48px !important;
    flex-shrink: 0 !important;
  }
  
  /* ===== CONTROLS - STICKY BOTTOM ===== */
  .meme-controls {
    position: sticky !important;
    bottom: 0 !important;
    left: 0 !important;
    right: 0 !important;
    transform: none !important;
    display: grid !important;
    grid-template-columns: repeat(4, 1fr) !important;
    gap: 0.5rem !important;
    width: 100% !important;
    max-width: 100% !important;
    padding: 0.75rem !important;
    background: rgba(0, 0, 0, 0.95) !important;
    backdrop-filter: blur(10px) !important;
    border-radius: 0 !important;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3) !important;
    z-index: 100 !important;
  }
  
  .control-btn {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 0.25rem !important;
    padding: 0.75rem 0.5rem !important;
    background: transparent !important;
    border: none !important;
    border-radius: 8px !important;
    font-size: 1.75rem !important;
    min-height: 64px !important;
    min-width: 60px !important;
    color: white !important;
    transition: all 0.2s ease !important;
  }
  
  .control-btn:active {
    background: rgba(255, 255, 255, 0.1) !important;
    transform: scale(0.95) !important;
  }
  
  .control-count {
    font-size: 0.65rem !important;
    font-weight: 600 !important;
    text-transform: capitalize !important;
  }
  
  /* ===== REACTIONS - TOUCH-FRIENDLY GRID ===== */
  .reactions-container {
    padding: 1rem !important;
    background: var(--bg-secondary, #f5f5f5) !important;
  }
  
  .reactions-buttons {
    display: grid !important;
    grid-template-columns: repeat(3, 1fr) !important;
    gap: 12px !important;
    margin-top: 0.75rem !important;
  }
  
  .reaction-btn {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 0.25rem !important;
    padding: 16px 12px !important;
    font-size: 28px !important;
    min-height: 72px !important;
    min-width: 72px !important;
    border-radius: 12px !important;
    background: white !important;
    border: 2px solid #e0e0e0 !important;
    transition: all 0.2s ease !important;
  }
  
  .reaction-btn:active {
    transform: scale(0.95) !important;
    background: #f0f0f0 !important;
  }
  
  .reaction-count {
    font-size: 0.75rem !important;
    font-weight: 600 !important;
  }
  
  /* ===== GAMIFICATION - MINIMIZED ===== */
  .streak-badge,
  .level-badge {
    font-size: 0.75rem !important;
    padding: 0.25rem 0.5rem !important;
  }
  
  /* Hide XP notifications on very small screens */
  @media (max-width: 375px) {
    .xp-notification,
    .achievement-notification {
      display: none !important;
    }
  }
  
  /* ===== CAROUSEL CONTROLS ===== */
  .carousel-arrow {
    width: 48px !important;
    height: 48px !important;
    font-size: 2rem !important;
    padding: 0 !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
  }
  
  .carousel-counter {
    font-size: 0.85rem !important;
    padding: 0.5rem 0.75rem !important;
  }
  
  /* ===== HIDE DESKTOP-ONLY ELEMENTS ===== */
  .nav-hints-container {
    display: none !important;
  }
  
  .milestone-progress-bar {
    display: none !important;
  }
  
  /* Hide side ads on mobile */
  .ad-container[data-position="left"],
  .ad-container[data-position="right"] {
    display: none !important;
  }
  
  /* ===== TYPOGRAPHY ===== */
  body {
    font-size: 16px !important;
    line-height: 1.5 !important;
  }
  
  h1 {
    font-size: 1.5rem !important;
  }
  
  h2 {
    font-size: 1.25rem !important;
  }
  
  h3 {
    font-size: 1.1rem !important;
  }
  
  /* ===== FORMS ===== */
  input[type="text"], 
  input[type="email"], 
  input[type="password"],
  input[type="search"],
  textarea {
    font-size: 16px !important; /* Prevents zoom on iOS */
    padding: 12px !important;
    min-height: 48px !important;
    width: 100% !important;
    box-sizing: border-box !important;
  }
  
  /* ===== SHARE BUTTONS ===== */
  .share-bar {
    display: grid !important;
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 12px !important;
    margin: 1rem 0 !important;
  }
  
  .share-btn {
    width: 100% !important;
    min-height: 56px !important;
    justify-content: center !important;
    font-size: 16px !important;
  }
}

/* ===== SMALL PHONES (≤375px) ===== */
@media (max-width: 375px) {
  .meme-controls {
    grid-template-columns: repeat(4, 1fr) !important;
    gap: 0.25rem !important;
    padding: 0.5rem !important;
  }
  
  .control-btn {
    font-size: 1.5rem !important;
    min-height: 56px !important;
    padding: 0.5rem 0.25rem !important;
  }
  
  .control-count {
    font-size: 0.6rem !important;
  }
  
  .reactions-buttons {
    grid-template-columns: repeat(3, 1fr) !important;
    gap: 8px !important;
  }
  
  .reaction-btn {
    font-size: 24px !important;
    min-height: 64px !important;
    padding: 12px 8px !important;
  }
}

/* ============================================
   3. ACCESSIBILITY
   ============================================ */

/* Focus states for keyboard navigation */
button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 3px solid #4A90E2 !important;
  outline-offset: 2px !important;
}

/* Active state feedback */
@media (max-width: 768px) {
  button:active,
  a.button:active {
    opacity: 0.7 !important;
    transition: opacity 0.1s ease !important;
  }
}

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

/* ============================================
   4. PERFORMANCE OPTIMIZATIONS
   ============================================ */

/* Reduce animations on low-end devices */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  .meme-info {
    background: #1a1a1a !important;
    color: #e0e0e0 !important;
  }
  
  .reactions-container {
    background: #222 !important;
  }
  
  .reaction-btn {
    background: #2d2d2d !important;
    border-color: #444 !important;
    color: #fff !important;
  }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  img {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
  }
}

/* ============================================
   5. TABLET LANDSCAPE (769px - 1024px)
   ============================================ */

@media (min-width: 769px) and (max-width: 1024px) {
  .meme-display {
    max-height: 70vh !important;
  }
  
  .meme-controls {
    grid-template-columns: repeat(5, 1fr) !important;
    max-width: 700px !important;
    margin: 0 auto !important;
  }
  
  .reactions-buttons {
    grid-template-columns: repeat(5, 1fr) !important;
    max-width: 600px !important;
    margin: 0 auto !important;
  }
}

/* ============================================
   6. LOADING STATES
   ============================================ */

@media (max-width: 768px) {
  .loading-skeleton {
    animation: shimmer 2s infinite;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
  }
  
  @keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
  }
  
  button.loading {
    opacity: 0.6;
    pointer-events: none;
    cursor: wait;
  }
}

/* ============================================
   7. SWIPE GESTURE INDICATORS
   ============================================ */

@media (max-width: 768px) {
  .swipe-hint {
    position: fixed;
    bottom: 120px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    opacity: 0;
    animation: fadeInOut 3s ease-in-out;
    pointer-events: none;
    z-index: 1000;
  }
  
  @keyframes fadeInOut {
    0%, 100% { opacity: 0; }
    10%, 90% { opacity: 1; }
  }
}

/* ============================================
   8. MODAL/OVERLAY FIXES
   ============================================ */

@media (max-width: 768px) {
  .modal,
  .level-up-modal {
    padding: 1rem !important;
  }
  
  .modal-content,
  .level-up-content {
    width: 90% !important;
    max-width: 400px !important;
    padding: 2rem 1.5rem !important;
  }
  
  .modal h2 {
    font-size: 1.75rem !important;
  }
  
  .modal p {
    font-size: 1rem !important;
  }
}

/* ============================================
   9. COLLECTION BADGES & META
   ============================================ */

@media (max-width: 768px) {
  .refined-collection-badge {
    font-size: 0.85rem !important;
    padding: 0.5rem 0.75rem !important;
  }
  
  .curation-signal {
    font-size: 0.85rem !important;
    padding: 0.5rem !important;
    margin: 0.5rem 0 !important;
  }
  
  .rarity-indicator {
    font-size: 0.75rem !important;
    padding: 0.25rem 0.5rem !important;
  }
}

/* ============================================
   10. COPY TOAST
   ============================================ */

@media (max-width: 768px) {
  .copy-toast {
    bottom: 100px !important;
    max-width: 90% !important;
    font-size: 0.9rem !important;
    padding: 12px 20px !important;
  }
  
  .copy-toast.show {
    animation: slideUpMobile 0.3s ease !important;
  }
  
  @keyframes slideUpMobile {
    from {
      transform: translateX(-50%) translateY(50px);
      opacity: 0;
    }
    to {
      transform: translateX(-50%) translateY(0);
      opacity: 1;
    }
  }
}