/* ============================================================================
   ENGO PWA — Mobile UX + Micro-interactions + Loading States
   ============================================================================
   This file adds PWA-specific enhancements WITHOUT modifying the core design.
   All changes are additive and non-breaking.
   ============================================================================ */

/* ── Safe Area Insets (iPhone notch) ── */
@supports (padding-top: env(safe-area-inset-top)) {
  .nav { padding-top: env(safe-area-inset-top); }
  body { padding-bottom: env(safe-area-inset-bottom); }
}

/* ── PWA Standalone Mode Adjustments ── */
@media all and (display-mode: standalone) {
  .nav { padding-top: 0; }
  body { -webkit-tap-highlight-color: transparent; }
  .sidebar-hamburger-btn {
    top: max(70px, calc(env(safe-area-inset-top, 20px) + 50px)) !important;
  }
}

/* ── PWA Standalone + Mobile Portrait ── */
@media all and (display-mode: standalone) and (orientation: portrait) {
  .nav { display: none !important; }
  #desktopNav { display: none !important; }
}

/* ── PWA Standalone + Mobile Landscape ── */
@media all and (display-mode: standalone) and (orientation: landscape) and (max-height: 600px) {
  .nav { display: none !important; }
  #desktopNav { display: none !important; }
}

/* ── Touch Feedback — Tap Highlight ── */
.btn, .nav a, .card, .level-card, .stat-card, .quiz-option, .auth-form button {
  -webkit-tap-highlight-color: rgba(108, 92, 231, 0.3);
}

/* ── Micro-interactions: Button Press ── */
.btn:active, button:active {
  transform: scale(0.97);
  transition: transform 0.1s ease;
}

/* ── Micro-interactions: Card Hover (Desktop) ── */
@media (hover: hover) {
  .card:hover, .level-card:hover, .stat-card:hover {
    transform: translateY(-2px);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
  }
}

/* ── Micro-interactions: Nav Link Active ── */
.nav a {
  position: relative;
  transition: color 0.2s ease;
}
.nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s ease, left 0.3s ease;
  border-radius: 1px;
}
.nav a.active::after, .nav a:hover::after {
  width: 100%;
  left: 0;
}

/* ── Loading Skeleton ── */
.skeleton {
  background: linear-gradient(90deg, var(--glass) 25%, rgba(255,255,255,0.06) 50%, var(--glass) 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
  min-height: 20px;
}
@keyframes skeleton-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-text { height: 14px; margin-bottom: 8px; width: 80%; }
.skeleton-text-sm { height: 10px; margin-bottom: 6px; width: 60%; }
.skeleton-title { height: 24px; margin-bottom: 12px; width: 50%; }
.skeleton-card { height: 120px; margin-bottom: 16px; }
.skeleton-avatar { width: 48px; height: 48px; border-radius: 50%; }

/* ── Loading Spinner ── */
.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--glass-border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 20px auto;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── Page Transition Fade ── */
.main {
  animation: fadeIn 0.3s ease;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Toast Notification Animation ── */
.toast {
  animation: slideUp 0.3s ease, fadeOut 0.3s ease 2.7s forwards;
}
@keyframes slideUp {
  from { transform: translateY(100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}
@keyframes fadeOut {
  to { opacity: 0; transform: translateY(-10px); }
}

/* ── Progress Bar Animation ── */
.fill {
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── PWA Install Button — Hero Inline Only ── */
.pwa-install-inline {
  display: none;
}
.pwa-install-btn-pwa {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

/* iPhone Instructions Modal */
.pwa-iphone-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.pwa-iphone-overlay.show { opacity: 1; }
.pwa-iphone-modal {
  background: rgba(15, 18, 35, 0.95);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  max-width: 340px;
  width: calc(100% - 48px);
  text-align: center;
}
.pwa-iphone-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}
.pwa-iphone-header h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}
.pwa-iphone-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 24px;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
}
.pwa-iphone-steps {
  text-align: right;
}
.pwa-iphone-step {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--glass-border);
  color: var(--text-soft);
  font-size: 14px;
}
.pwa-iphone-step:last-child { border-bottom: none; }
.step-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}
.step-icon {
  font-size: 16px;
}

/* ── Offline Indicator ── */
.offline-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--danger);
  color: white;
  text-align: center;
  padding: 8px;
  font-size: 13px;
  font-weight: 600;
  z-index: 10000;
  transform: translateY(-100%);
  transition: transform 0.3s ease;
}
.offline-banner.show { transform: translateY(0); }

/* ── Pull to Refresh Indicator ── */
.pull-indicator {
  position: fixed;
  top: 60px;
  left: 50%;
  transform: translateX(-50%) translateY(-100%);
  width: 32px;
  height: 32px;
  border: 2px solid var(--glass-border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 999;
}
.pull-indicator.show { opacity: 1; }

/* ── Loading State Containers ── */
.loading-state {
  padding: 8px 0;
}
.loading-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}
.loading-stat-card {
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 20px 12px;
  text-align: center;
}
.loading-dashboard-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 20px;
}
.loading-levels-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.loading-level-card {
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
}
.loading-phrase-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 12px;
}
.loading-phrase-left {
  flex: 1;
}
.loading-vocab-item {
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 8px;
}
.loading-lb-row {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-bottom: 8px;
}

@media (max-width: 900px) {
  .loading-dashboard-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .loading-stats-grid { grid-template-columns: repeat(2, 1fr); }
  .loading-levels-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .loading-stats-grid { grid-template-columns: 1fr 1fr; }
  .loading-levels-grid { grid-template-columns: 1fr; }
}

/* ── Smooth Scroll Behavior ── */
html { scroll-behavior: smooth; }

/* ── Focus States for Accessibility ── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ── Reduced Motion ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ── Dashboard Card Enhancements ── */
.dashboard-stats .stat-card {
  position: relative;
  overflow: hidden;
}
.dashboard-stats .stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0;
  transition: opacity 0.3s ease;
}
.dashboard-stats .stat-card:hover::before {
  opacity: 1;
}

/* ── Progress Circle Glow ── */
.progress-circle {
  position: relative;
}
.progress-circle::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  background: conic-gradient(var(--accent) 0deg, transparent 0deg);
  opacity: 0.15;
  filter: blur(8px);
  z-index: -1;
}

/* ── Badge Shine Effect ── */
.badge-mastered, .badge-progress, .badge-unlocked {
  position: relative;
  overflow: hidden;
}
.badge-mastered::after, .badge-progress::after, .badge-unlocked::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    to right,
    transparent 0%,
    rgba(255,255,255,0.08) 50%,
    transparent 100%
  );
  transform: rotate(30deg);
  animation: badge-shine 3s ease-in-out infinite;
}
@keyframes badge-shine {
  0%, 100% { transform: translateX(-100%) rotate(30deg); }
  50% { transform: translateX(100%) rotate(30deg); }
}

/* ── Card Content Fade-in Stagger ── */
.dashboard-grid .card.fade-in:nth-child(1) { animation-delay: 0.05s; }
.dashboard-grid .card.fade-in:nth-child(2) { animation-delay: 0.1s; }
.dashboard-grid .card.fade-in:nth-child(3) { animation-delay: 0.15s; }
.dashboard-grid .card.fade-in:nth-child(4) { animation-delay: 0.2s; }

/* ── Weakness Tag Pulse ── */
.weakness-tag {
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.weakness-tag:hover {
  transform: scale(1.05);
  box-shadow: 0 2px 8px rgba(255, 71, 87, 0.2);
}

/* ── Level Card Unlock Animation ── */
.level-card.unlocked {
  animation: level-unlock 0.4s ease;
}
@keyframes level-unlock {
  0% { transform: scale(0.95); opacity: 0.7; }
  50% { transform: scale(1.02); }
  100% { transform: scale(1); opacity: 1; }
}

/* ── Quiz Option Hover ── */
.quiz-option {
  transition: all 0.2s ease;
}
.quiz-option:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.quiz-option.selected {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 0 12px rgba(0, 206, 201, 0.15);
}

/* ── Button Ripple Effect ── */
.btn-p, .btn-g, .btn-primary, .btn-secondary {
  position: relative;
  overflow: hidden;
}
.btn-p::after, .btn-g::after, .btn-primary::after, .btn-secondary::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  transform: translate(-50%, -50%);
  transition: width 0.4s ease, height 0.4s ease;
}
.btn-p:active::after, .btn-g:active::after, .btn-primary:active::after, .btn-secondary:active::after {
  width: 200px;
  height: 200px;
}

/* ═══════════════════════════════════════════
   Welcome Popup — Visitors Only
   ═══════════════════════════════════════════ */
.engo-welcome-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s ease;
  padding: 16px;
}
.engo-welcome-overlay.show {
  opacity: 1;
  visibility: visible;
}
.engo-welcome-card {
  background: rgba(15, 18, 35, 0.95);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  max-width: 600px;
  width: 100%;
  max-height: 85vh;
  position: relative;
  box-shadow: 0 16px 64px rgba(0, 0, 0, 0.5);
  transform: translateY(20px) scale(0.97);
  transition: transform 0.35s var(--ease);
  overflow: hidden;
}
.engo-welcome-overlay.show .engo-welcome-card {
  transform: translateY(0) scale(1);
}
.engo-welcome-close {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  color: var(--text-muted);
  font-size: 22px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  z-index: 2;
  line-height: 1;
  padding: 0;
}
.engo-welcome-close:hover {
  background: var(--surface-hover);
  color: var(--text);
  border-color: var(--glass-border-hover);
}
.engo-welcome-body {
  padding: 36px 32px 28px;
  overflow-y: auto;
  max-height: 85vh;
  direction: rtl;
}
.engo-welcome-body h2 {
  font-size: 22px;
  font-weight: 800;
  color: var(--text);
  margin: 0 0 12px;
  line-height: 1.4;
}
.engo-welcome-body h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--primary-light);
  margin: 20px 0 8px;
}
.engo-welcome-body p {
  font-size: 15px;
  color: var(--text-soft);
  line-height: 1.8;
  margin: 0 0 12px;
}
.engo-welcome-body ul {
  list-style: none;
  padding: 0;
  margin: 0 0 8px;
}
.engo-welcome-body li {
  font-size: 14px;
  color: var(--text-soft);
  line-height: 1.8;
  padding: 4px 0 4px 16px;
  position: relative;
}
.engo-welcome-body li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}
.engo-welcome-final {
  font-size: 14px !important;
  color: var(--text-muted) !important;
  border-top: 1px solid var(--glass-border);
  padding-top: 12px;
  margin-top: 16px !important;
}
.engo-welcome-start {
  margin-top: 20px;
}

/* Mobile adjustments */
@media (max-width: 768px) {
  .engo-welcome-overlay {
    padding: 12px;
    align-items: flex-end;
  }
  .engo-welcome-card {
    max-height: 90vh;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }
  .engo-welcome-body {
    padding: 28px 20px 24px;
    max-height: 90vh;
  }
  .engo-welcome-body h2 {
    font-size: 20px;
  }
  .engo-welcome-body h3 {
    font-size: 16px;
  }
}

/* Safe area for iPhone */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
  .engo-welcome-card {
    margin-bottom: env(safe-area-inset-bottom);
  }
}