/* --- Design System & CSS Variables --- */
:root {
  /* Color Palette - Dark Theme (Default) */
  --bg-color: #090D1A;
  --bg-gradient: radial-gradient(circle at 50% 50%, #111827 0%, #090D1A 100%);
  --panel-bg: rgba(17, 24, 39, 0.7);
  --panel-border: rgba(255, 255, 255, 0.08);
  
  --card-bg-front: linear-gradient(135deg, rgba(23, 29, 51, 0.9) 0%, rgba(15, 20, 36, 0.95) 100%);
  --card-bg-back: linear-gradient(135deg, rgba(21, 23, 44, 0.95) 0%, rgba(13, 15, 30, 0.98) 100%);
  --card-border: rgba(255, 255, 255, 0.12);
  --card-shadow: 0 20px 40px rgba(0, 0, 0, 0.5), 0 0 40px rgba(99, 102, 241, 0.1);

  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  
  --accent-gold: #F59E0B;
  --accent-gold-gradient: linear-gradient(135deg, #FCD34D 0%, #D97706 100%);
  --accent-blue: #6366F1;
  --accent-blue-gradient: linear-gradient(135deg, #818CF8 0%, #4F46E5 100%);
  
  --color-success: #10B981;
  --color-success-bg: rgba(16, 185, 129, 0.15);
  --color-danger: #EF4444;
  --color-danger-bg: rgba(239, 68, 68, 0.15);
  --color-warning: #F59E0B;
  --color-warning-bg: rgba(245, 158, 11, 0.15);
  
  --btn-secondary-bg: rgba(255, 255, 255, 0.05);
  --btn-secondary-hover: rgba(255, 255, 255, 0.1);
  --btn-secondary-border: rgba(255, 255, 255, 0.1);

  --font-arabic: "Noto Naskh Arabic", "Noto Sans Arabic", "Noto", "Scheherazade New", "Scheherazade", "Amiri", serif;
  --font-sans: 'Outfit', sans-serif;
  
  --border-radius-lg: 24px;
  --border-radius-md: 16px;
  --border-radius-sm: 10px;
  
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-card: transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1.15), box-shadow 0.3s ease;
}

/* Light Theme Variables */
body.light-theme {
  --bg-color: #F1F5F9;
  --bg-gradient: radial-gradient(circle at 50% 50%, #F8FAFC 0%, #E2E8F0 100%);
  --panel-bg: rgba(255, 255, 255, 0.8);
  --panel-border: rgba(15, 23, 42, 0.08);
  
  --card-bg-front: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 250, 252, 0.98) 100%);
  --card-bg-back: linear-gradient(135deg, rgba(255, 255, 255, 0.98) 0%, rgba(241, 245, 249, 0.98) 100%);
  --card-border: rgba(15, 23, 42, 0.08);
  --card-shadow: 0 20px 40px rgba(15, 23, 42, 0.06), 0 0 20px rgba(99, 102, 241, 0.03);

  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  
  --accent-gold: #D97706;
  --accent-gold-gradient: linear-gradient(135deg, #F59E0B 0%, #B45309 100%);
  
  --btn-secondary-bg: rgba(15, 23, 42, 0.04);
  --btn-secondary-hover: rgba(15, 23, 42, 0.08);
  --btn-secondary-border: rgba(15, 23, 42, 0.08);
}

/* --- Base Resets & Layout --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-color);
  background-image: var(--bg-gradient);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow-x: hidden;
  position: relative;
  transition: background 0.5s ease, color 0.3s ease;
}

/* --- Ambient Glowing Spheres (Premium Aesthetic) --- */
.glow-sphere {
  position: absolute;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  filter: blur(120px);
  z-index: -1;
  opacity: 0.15;
  pointer-events: none;
  animation: float-glow 20s infinite alternate ease-in-out;
}

.glow-1 {
  background: var(--accent-blue);
  top: -100px;
  right: -50px;
}

.glow-2 {
  background: var(--accent-gold);
  bottom: -150px;
  left: -100px;
  animation-delay: -10s;
}

@keyframes float-glow {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(50px, 50px) scale(1.2); }
}

/* --- App Container --- */
.app-container {
  width: 100%;
  max-width: 1100px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  min-height: 95vh;
}

/* --- Header Component --- */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--panel-border);
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--border-radius-sm);
  background: var(--accent-blue-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: #FFF;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.logo-text h1 {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.logo-text .tagline {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.stat-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--btn-secondary-bg);
  border: 1px solid var(--btn-secondary-border);
  padding: 8px 16px;
  border-radius: 30px;
  font-size: 0.85rem;
  font-weight: 500;
  transition: var(--transition-smooth);
}

.stat-badge i {
  color: var(--accent-gold);
}

.icon-btn {
  background: var(--btn-secondary-bg);
  border: 1px solid var(--btn-secondary-border);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: var(--transition-smooth);
}

body.desktop-device .icon-btn:hover {
  background: var(--btn-secondary-hover);
  transform: translateY(-2px);
}

/* --- Main Layout Grid --- */
.main-content {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 24px;
  flex: 1;
  align-items: start; /* Aligns columns to the top naturally */
}

/* --- Card Blur Effect --- */
.card-blur {
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  border-radius: var(--border-radius-lg);
  padding: 24px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
}

/* --- Controls Sidebar (Left Column) --- */
.controls-sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-self: start;
}

.sidebar-card {
  width: 100%;
}

.sidebar-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}

.sidebar-card-header h3 {
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
}

.reset-link-btn {
  background: none;
  border: none;
  color: var(--accent-blue);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border-radius: var(--border-radius-sm);
  transition: var(--transition-smooth);
}

.reset-link-btn:hover {
  background: rgba(99, 102, 241, 0.1);
  color: var(--text-primary);
}

.panel-section {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.panel-section h3 {
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
}

.control-group label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

/* Custom Select Dropdown Styling */
.select-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.select-wrapper select {
  width: 100%;
  background: var(--btn-secondary-bg);
  border: 1px solid var(--btn-secondary-border);
  border-radius: var(--border-radius-sm);
  padding: 12px 16px;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  transition: var(--transition-smooth);
}

.select-wrapper select:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.select-arrow {
  position: absolute;
  right: 16px;
  font-size: 0.75rem;
  color: var(--text-muted);
  pointer-events: none;
}

/* Starred Only Toggle Custom Checkbox */
.starred-toggle-wrapper {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 0;
}

.custom-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border: 1px solid var(--btn-secondary-border);
  border-radius: 6px;
  background: var(--btn-secondary-bg);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: var(--transition-smooth);
}

.custom-checkbox:hover {
  border-color: var(--accent-gold);
  background: rgba(245, 158, 11, 0.05);
}

.custom-checkbox:checked {
  background: var(--accent-gold);
  border-color: var(--accent-gold);
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.3);
}

.custom-checkbox:checked::after {
  content: '\f00c'; /* FontAwesome check mark */
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  font-size: 0.75rem;
  color: #090D1A;
}

body.light-theme .custom-checkbox:checked::after {
  color: #ffffff;
}

.custom-checkbox:focus-visible {
  outline: none;
  border-color: var(--accent-gold);
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.25);
}

.custom-checkbox-label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.custom-checkbox-label .star-icon {
  color: var(--accent-gold);
  transition: var(--transition-smooth);
}

.custom-checkbox:checked + .custom-checkbox-label .star-icon {
  transform: scale(1.1) rotate(360deg);
}

/* Double Range Slider Styling */
.slider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.slider-value-display {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-blue);
  background: rgba(99, 102, 241, 0.1);
  padding: 2px 8px;
  border-radius: 12px;
}

.range-slider-wrapper {
  position: relative;
  width: 100%;
  height: 6px;
  margin: 15px 0 10px 0;
  background: var(--btn-secondary-border);
  border-radius: 4px;
}

.slider-track {
  position: absolute;
  height: 100%;
  background: var(--accent-blue-gradient);
  border-radius: 4px;
  left: 0%;
  right: 0%;
}

.range-slider-wrapper input[type="range"] {
  position: absolute;
  width: 100%;
  height: 6px;
  top: 0;
  left: 0;
  background: none;
  pointer-events: none;
  appearance: none;
  -webkit-appearance: none;
  margin: 0;
}

.range-slider-wrapper input[type="range"]::-webkit-slider-thumb {
  height: 18px;
  width: 18px;
  border-radius: 50%;
  background: var(--text-primary);
  border: 2.5px solid var(--accent-blue);
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  pointer-events: auto;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
  transition: transform 0.15s ease, background-color 0.15s ease;
  position: relative;
  z-index: 2;
}

.range-slider-wrapper input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  background: var(--accent-blue);
}

.range-slider-wrapper input[type="range"]::-webkit-slider-thumb:active {
  transform: scale(1.3);
  box-shadow: 0 0 0 8px rgba(99, 102, 241, 0.15);
}

.range-slider-wrapper input[type="range"]::-moz-range-thumb {
  height: 18px;
  width: 18px;
  border-radius: 50%;
  background: var(--text-primary);
  border: 2.5px solid var(--accent-blue);
  cursor: pointer;
  pointer-events: auto;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
  transition: transform 0.15s ease, background-color 0.15s ease;
  position: relative;
  z-index: 2;
}

.range-slider-wrapper input[type="range"]::-moz-range-thumb:hover {
  transform: scale(1.2);
  background: var(--accent-blue);
}

.range-slider-wrapper input[type="range"]::-moz-range-thumb:active {
  transform: scale(1.3);
  box-shadow: 0 0 0 8px rgba(99, 102, 241, 0.15);
}

/* Stats Styling */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.stat-card {
  background: var(--btn-secondary-bg);
  border: 1px solid var(--btn-secondary-border);
  border-radius: var(--border-radius-sm);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

.stat-val {
  font-size: 1.25rem;
  font-weight: 600;
}

.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }
.text-warning { color: var(--color-warning); }

/* Progress Bar */
.progress-bar-container {
  height: 6px;
  width: 100%;
  background: var(--btn-secondary-bg);
  border-radius: 10px;
  overflow: hidden;
  margin-top: 4px;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent-blue-gradient);
  width: 0%;
  border-radius: 10px;
  transition: width 0.4s ease;
}

/* Buttons */
.btn {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 12px 20px;
  border-radius: var(--border-radius-sm);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: var(--transition-smooth);
}

.btn-full {
  width: 100%;
}

.btn-secondary {
  background: var(--btn-secondary-bg);
  color: var(--text-primary);
  border: 1px solid var(--btn-secondary-border);
}

body.desktop-device .btn-secondary:hover {
  background: var(--btn-secondary-hover);
  transform: translateY(-1px);
}

/* --- Card Display Area (Right Side) --- */
.card-display-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: 20px;
  padding-top: 10px; /* Visually aligns with the first sidebar card */
}

/* 3D Card Flipping Container */
.flashcard-container {
  width: 100%;
  max-width: 520px;
  height: 440px;
  perspective: 1200px;
}

.flashcard {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: var(--transition-card);
  cursor: pointer;
  border-radius: var(--border-radius-lg);
}

/* Active Flip State */
.flashcard.is-flipped {
  transform: rotateY(180deg);
}

.flashcard:focus-visible {
  outline: 3px solid var(--accent-blue);
  outline-offset: 4px;
}

/* Card Faces */
.card-face {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--border-radius-lg);
  border: 1.5px solid var(--card-border);
  box-shadow: var(--card-shadow);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
  transition: border-color 0.3s ease;
}

.card-face::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: var(--accent-blue-gradient);
}

/* Front card specific */
.card-front {
  background: var(--card-bg-front);
}

/* Back card specific & rotated */
.card-back {
  background: var(--card-bg-back);
  transform: rotateY(180deg);
  padding: 22px; /* More compact padding to maximize internal height */
}

.card-back::before {
  background: var(--accent-gold-gradient);
}

/* Ensure card back body doesn't overflow */
.card-back .card-body {
  gap: 10px; /* Tighter spacing on the back to fit meanings and links */
  overflow-y: auto; /* Scroll safety guard if content exceeds boundary */
  max-height: 100%;
  width: 100%;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.1) transparent;
}

/* Styled scrollbar for card back body */
.card-back .card-body::-webkit-scrollbar {
  width: 4px;
}

.card-back .card-body::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 4px;
}

.card-back .card-body::-webkit-scrollbar-track {
  background: transparent;
}

/* Card Substructures */
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.card-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.pos-tag {
  background: var(--color-success-bg);
  color: var(--color-success);
  border: 1px solid rgba(16, 185, 129, 0.2);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 20px;
  letter-spacing: 0.5px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.frequency-tag {
  background: rgba(99, 102, 241, 0.1);
  color: var(--accent-blue);
  border: 1px solid rgba(99, 102, 241, 0.15);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
  letter-spacing: 0.5px;
}

.card-back .frequency-tag {
  background: rgba(245, 158, 11, 0.1);
  color: var(--accent-gold);
  border: 1px solid rgba(245, 158, 11, 0.15);
}

.card-index-indicator {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Card Body */
.card-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 16px;
}

/* Quranic Arabic typography */
.arabic-word-wrapper {
  margin: 10px 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  position: relative;
}

.speak-btn {
  background: var(--btn-secondary-bg);
  border: 1px solid var(--btn-secondary-border);
  color: var(--accent-blue);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
  transition: var(--transition-smooth);
}

body.desktop-device .speak-btn:hover {
  background: var(--btn-secondary-hover);
  border-color: var(--accent-blue);
  transform: scale(1.1) translateY(-1px);
}

.speak-btn:active {
  transform: scale(0.95);
}

.arabic-mini-wrapper {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.speak-btn-mini {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 4px;
  display: inline-flex;
  align-items: center;
  transition: var(--transition-smooth);
}

body.desktop-device .speak-btn-mini:hover {
  color: var(--accent-blue);
  transform: scale(1.15);
}

.speak-btn-mini:active {
  transform: scale(0.95);
}


.arabic-text {
  font-family: var(--font-arabic);
  font-size: 5.6rem; /* Scaled up for majestic presence */
  font-weight: 700;
  line-height: 1.1;
  color: var(--text-primary);
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
  direction: rtl;
}

/* Arabic text back face layout */
.arabic-mini {
  font-family: var(--font-arabic);
  font-size: 3.3rem; /* Scaled up for extremely high readability */
  font-weight: 700;
  color: var(--text-secondary);
}

.transliteration {
  font-size: 1.75rem; /* Scaled up further */
  color: var(--accent-blue);
  font-weight: 500;
  letter-spacing: 0.5px;
}

.transliteration-mini {
  font-size: 1.35rem; /* Scaled up further */
  color: var(--text-muted);
}

.divider {
  width: 60px;
  height: 2px;
  background: var(--card-border);
  margin: 8px 0;
}

/* English Meaning style */
.meaning-wrapper {
  max-width: 90%;
}

.meaning-text {
  font-size: 1.45rem; /* Decreased to fit combined comma-separated meanings list comfortably */
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
}

.card-footer {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  margin-top: 10px;
}

.interaction-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

body.desktop-device .card-face:hover .interaction-hint {
  color: var(--text-secondary);
}

/* Pulse interaction for hint icon */
.interaction-hint i {
  animation: pulse-icon 2s infinite ease-in-out;
}

@keyframes pulse-icon {
  0% { transform: scale(1); }
  50% { transform: scale(1.15) rotate(15deg); }
  100% { transform: scale(1); }
}

/* --- Assessment Controls Deck --- */
.controls-deck {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  width: 100%;
  max-width: 520px;
}

.btn-nav {
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  color: var(--text-primary);
  width: 56px;
  height: 56px;
  border-radius: 50%;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

body.desktop-device .btn-nav:hover {
  background: var(--btn-secondary-hover);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  transform: translateY(-2px);
}

.btn-nav:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  transform: none;
  border-color: var(--panel-border);
  color: var(--text-muted);
}

.assessment-buttons {
  display: flex;
  gap: 12px;
  flex: 1;
}

.btn-danger {
  background: var(--color-danger-bg);
  border: 1px solid var(--color-danger);
  color: var(--color-danger);
  flex: 1;
}

body.desktop-device .btn-danger:hover:not(:disabled) {
  background: var(--color-danger);
  color: #FFF;
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
}

.btn-success {
  background: var(--color-success-bg);
  border: 1px solid var(--color-success);
  color: var(--color-success);
  flex: 1;
}

body.desktop-device .btn-success:hover:not(:disabled) {
  background: var(--color-success);
  color: #FFF;
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-danger:disabled, .btn-success:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  transform: none;
}

/* --- Keyboard Shortcuts Help Banner --- */
.keyboard-shortcuts {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--btn-secondary-bg);
  padding: 6px 16px;
  border-radius: 30px;
  border: 1px solid var(--btn-secondary-border);
}

.keyboard-shortcuts kbd {
  background: var(--text-muted);
  color: var(--bg-color);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.7rem;
}

/* --- Footer --- */
footer {
  text-align: center;
  padding: 16px 0;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--panel-border);
  margin-top: auto;
}

.rules-reference {
  margin-top: 10px;
  display: flex;
  justify-content: center;
  width: 100%;
}

.reference-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.75rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition-smooth);
}

body.desktop-device .reference-link:hover {
  color: var(--accent-blue);
  transform: translateY(-1px);
}

/* --- Page Transitions / Dynamic Animation Classes --- */
.scale-down {
  transform: scale(0.95);
  opacity: 0.8;
}

.slide-next-out {
  transform: translateX(-50px) rotateY(-10deg) scale(0.95);
  opacity: 0;
}

.slide-prev-out {
  transform: translateX(50px) rotateY(10deg) scale(0.95);
  opacity: 0;
}

.slide-in {
  transform: scale(1.05);
  opacity: 0;
}

/* --- Contextual Meanings (Back of Card) --- */
.context-meanings {
  margin-top: 14px;
  width: 100%;
  text-align: center;
}

.context-title {
  display: block;
  font-size: 0.85rem; /* Scaled up further */
  color: var(--text-muted);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 8px;
}

.context-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  max-height: 80px;
  overflow-y: auto;
  padding: 2px;
}

/* Glassmorphic Capsule Chips */
.context-chip {
  font-size: 0.9rem; /* Scaled up further */
  font-weight: 500;
  padding: 5px 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  color: var(--text-primary);
  white-space: nowrap;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
  transition: var(--transition-smooth);
}

body.desktop-device .context-chip:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--accent-gold-semi);
  transform: translateY(-1px);
}

/* Light mode specific variations */
[data-theme="light"] .context-chip {
  background: rgba(0, 0, 0, 0.03);
  border-color: rgba(0, 0, 0, 0.06);
}

body.desktop-device [data-theme="light"] .context-chip:hover {
  background: rgba(0, 0, 0, 0.05);
  border-color: var(--accent-gold);
}

.study-link-wrapper {
  margin-top: 16px;
  display: flex;
  justify-content: center;
  width: 100%;
}

.study-link {
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.18);
  color: var(--accent-blue);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 30px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition-smooth);
}

body.desktop-device .study-link:hover {
  background: rgba(245, 158, 11, 0.08);
  border-color: var(--accent-gold);
  color: var(--accent-gold);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.15);
}

.study-link:active {
  transform: translateY(0);
}

/* --- Responsive Adjustments --- */
@media (max-width: 860px) {
  .main-content {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .controls-sidebar {
    order: 2; /* Sidebar goes down on mobile */
  }
  
  .card-display-area {
    order: 1;
    margin-top: 10px;
  }
  
  .flashcard-container {
    height: 440px; /* Increased to support scaled fonts on tablet */
  }

  .arabic-text {
    font-size: 4.8rem;
  }
}

@media (max-width: 480px) {
  .app-container {
    padding: 12px;
    gap: 16px;
  }

  header {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
  }

  .flashcard-container {
    height: 390px; /* Increased to support scaled fonts on mobile */
  }

  .arabic-text {
    font-size: 4rem;
  }

  .meaning-text {
    font-size: 1.15rem;
  }

  .controls-deck {
    gap: 10px;
  }

  .btn-nav {
    width: 48px;
    height: 48px;
  }

  .assessment-buttons {
    gap: 6px;
  }

  .btn {
    padding: 10px 14px;
    font-size: 0.8rem;
  }
  
  .keyboard-shortcuts {
    display: none; /* Hide shortcuts on very small screens since they don't have keyboards */
  }
}

/* --- About Page Styling --- */
.main-content.single-column {
  grid-template-columns: 1fr;
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

.about-card {
  width: 100%;
  text-align: left;
}

.profile-header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--panel-border);
  padding-bottom: 20px;
}

.profile-avatar {
  width: 70px;
  height: 70px;
  background: var(--btn-secondary-hover);
  border: 1.5px solid var(--panel-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  color: var(--accent-blue);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  flex-shrink: 0;
}

.profile-title h2 {
  font-family: var(--font-sans);
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.profile-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 500;
}

.profile-bio p {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.section-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 24px 0 16px 0;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  border-bottom: 1px solid var(--panel-border);
  padding-bottom: 8px;
}

.credentials-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.credentials-list li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.credential-icon {
  width: 36px;
  height: 36px;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.15);
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  color: var(--accent-blue);
  flex-shrink: 0;
  margin-top: 2px;
}

.credential-detail {
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-align: left;
}

.credential-detail strong {
  font-size: 0.95rem;
  color: var(--text-primary);
  font-weight: 600;
}

.credential-detail span {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.connect-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
}

.connect-item {
  background: var(--btn-secondary-bg);
  border: 1px solid var(--btn-secondary-border);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 30px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition-smooth);
}

body.desktop-device .connect-item:hover {
  background: var(--btn-secondary-hover);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  transform: translateY(-2px);
}

/* --- Search Input & Dropdown Styling --- */
.search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
}

.search-icon {
  position: absolute;
  left: 12px;
  color: var(--text-muted);
  font-size: 0.9rem;
  pointer-events: none;
}

.search-wrapper input {
  width: 100%;
  padding: 10px 36px 10px 34px;
  background: var(--input-bg);
  border: 1.5px solid var(--card-border);
  border-radius: var(--border-radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  transition: var(--transition-smooth);
}

.search-wrapper input:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
  background: var(--btn-secondary-hover);
}

.clear-search-btn {
  position: absolute;
  right: 12px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  transition: var(--transition-smooth);
}

.clear-search-btn:hover {
  color: var(--text-primary);
  transform: scale(1.1);
}

.search-results-box {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background: var(--card-bg-front);
  border: 1.5px solid var(--card-border);
  border-radius: var(--border-radius-sm);
  max-height: 250px;
  overflow-y: auto;
  z-index: 100;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.1) transparent;
}

/* Styled scrollbar for search results */
.search-results-box::-webkit-scrollbar {
  width: 4px;
}

.search-results-box::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 4px;
}

.search-result-item {
  padding: 10px 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--card-border);
  font-size: 0.85rem;
  transition: var(--transition-smooth);
  text-align: left;
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item.selected,
.search-result-item:hover {
  background: rgba(99, 102, 241, 0.08);
  color: var(--accent-blue);
}

.search-result-left {
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-width: 70%;
}

.search-result-translit {
  font-weight: 600;
  color: var(--text-primary);
}

.search-result-meaning {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.search-result-arabic {
  font-family: var(--font-arabic);
  font-size: 1.15rem;
  color: var(--text-secondary);
  direction: rtl;
}

.search-result-no-match {
  padding: 12px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* --- Star Bookmark Styling --- */
.card-header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.star-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
}

body.desktop-device .star-btn:hover {
  color: var(--accent-gold);
  transform: scale(1.15);
}

.star-btn:active {
  transform: scale(0.9);
}

.star-btn.starred {
  color: var(--accent-gold);
}

.star-btn.starred i {
  font-weight: 900; /* Force solid FontAwesome star */
}