:root {
  /* Vibrant Blue-Purple Palette */
  --bg-space: #020617;
  --bg-card: rgba(255, 255, 255, 0.8);
  --bg-app: #f5f7ff;
  --panel-bg: #ffffff;
  
  --primary: #6366f1; /* Vibrant Indigo */
  --primary-rgb: 99, 102, 241;
  --accent: #a855f7;  /* Purple */
  --accent-rgb: 168, 85, 247;
  --success: #10b981;
  --danger: #ef4444;
  
  --text-main: #1e1b4b; /* Deep Indigo */
  --text-muted: #6366f1; /* Muted Indigo */
  --text-rgb: 30, 27, 75;
  --text-on-accent: #ffffff;
  
  --border: #e0e7ff;
  --glass: rgba(255, 255, 255, 0.9);
  
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 8px;
  
  --shadow-soft: 0 10px 40px -10px rgba(99, 102, 241, 0.15);
  --shadow-glow: 0 0 24px rgba(99, 102, 241, 0.2);

  --f-sans: 'Noto Sans', 'Noto Sans JP', 'Noto Sans KR', system-ui, -apple-system, sans-serif;
  --f-serif: 'Playfair Display', serif;

  --f-input: 'Noto Sans', system-ui, sans-serif;
}

[data-theme="dark"] {
  --bg-app: #020617;
  --panel-bg: #0f172a;
  --bg-card: #1e293b;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-rgb: 248, 250, 252;
  --border: rgba(255, 255, 255, 0.1);
  --glass: rgba(15, 23, 42, 0.8);
  --primary: #818cf8;
  --primary-rgb: 129, 140, 248;
  --accent: #c084fc;
  --accent-rgb: 192, 132, 252;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: var(--f-sans);
}

input, textarea, select, .styled-input, #bulkInput {
  font-family: 'Noto Sans', 'Arial', sans-serif !important;
}

body {
  background: var(--bg-app);
  color: var(--text-main);
  min-height: 100vh;
  transition: background 0.4s ease, color 0.4s ease;
  overflow-x: hidden;
}

input, textarea, select, button {
  font-family: var(--f-input);
}

/* CUSTOM SCROLLBAR */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 10px; border: 2px solid transparent; background-clip: content-box; }

/* HEADER */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--glass);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  height: 80px;
  display: flex;
  align-items: center;
}

.header-inner {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 16px;
  text-decoration: none;
  margin-left: 40px; /* Aligned with the content grid */
}

.logo-mark {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 14px;
  display: grid;
  place-items: center;
  color: white;
  box-shadow: var(--shadow-glow);
}

.logo-type { }

.brand-name {
  font-size: 24px;
  font-weight: 900;
  letter-spacing: -0.02em;
  background: linear-gradient(to bottom right, var(--text-main), var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-nav {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-left: auto;
}

.nav-link {
  background: var(--primary);
  border: 1px solid var(--border);
  color: white;
  padding: 12px 24px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 14px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 8px 16px -4px rgba(var(--primary-rgb), 0.2);
  cursor: pointer;
  border: none;
}

.nav-link:hover {
  filter: brightness(1.2);
  transform: translateY(-2px);
  box-shadow: 0 12px 20px -4px rgba(var(--primary-rgb), 0.3);
}

.btn-theme {
  background: #f59e0b !important; /* Amber theme toggle */
  width: 48px;
  padding: 0;
  justify-content: center;
}

[data-theme="dark"] .btn-theme {
  background: var(--accent) !important;
}

/* MAIN CONTENT */
.main-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 40px 32px 100px;
}

/* STAGE SECTION */
.learning-stage {
  display: flex !important;
  flex-direction: column !important;
  align-items: center;
  gap: 0;
  margin-bottom: 40px;
  width: 100%;
  overflow: hidden; /* Prevent screen shaking during fly animations */
}

.flashcard-container {
  width: 100%;
  max-width: 800px;
  perspective: 2000px; 
  margin: 0 auto;
  overflow: visible; /* Ensure 3D faces aren't clipped */
}

.flashcard {
  width: 100%;
  aspect-ratio: 1.6 / 1;
  cursor: pointer;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1); 
  will-change: transform;
  touch-action: pan-y; /* Allow scrolling up/down but handle swiping manually */
  user-select: text;
  -webkit-user-select: text;
  -webkit-tap-highlight-color: transparent;
}

@media (max-width: 768px) {
  .flashcard {
    aspect-ratio: 0.8 / 1;
  }
  
  .card-face {
    padding: 10px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start; /* Reset to start to avoid weird spacing at top/bottom */
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  
  .card-content {
     display: flex;
     flex-direction: column;
     justify-content: center; 
     align-items: center;
     width: 100%;
     flex-grow: 1; /* Allow to take all space between top/bottom bars */
     padding: 10px 0;
     margin: auto 0; /* Auto margins will center it if there's space */
  }

  .card-top-actions { height: 44px; }
  .card-bottom-actions { height: 36px; }

  #frontMain, #backMain {
    font-size: 44px;
    word-break: break-word;
    margin: 5px 0;
    line-height: 1.2;
  }

  #backExplain {
    font-size: 14px;
    padding: 12px;
    margin-top: 10px;
    width: 100%;
  }
}

.flashcard.flipped {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  -webkit-backface-visibility: hidden !important;
  backface-visibility: hidden !important;
  border-radius: var(--radius-xl);
  background: var(--panel-bg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  padding: 24px 40px 40px;
  /* Stabilization */
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
  overflow-y: auto; /* Fix for long content on mobile */
  word-break: break-word;
}

.card-face.front {
  transform: rotateY(0deg);
  z-index: 2;
}

.card-face.back {
  transform: rotateY(180deg);
  background: linear-gradient(135deg, var(--panel-bg), var(--bg-app));
}

/* Explicit hide fallback to prevent mirrored front face visible through back face */
.flashcard.flipped .front {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.flashcard:not(.flipped) .back {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.flashcard.flipped .back {
  opacity: 1;
  pointer-events: auto;
}
.flashcard:not(.flipped) .front {
  opacity: 1;
  pointer-events: auto;
}

/* TOP CONTROLS ON CARD */
.card-top-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0px;
  height: 60px;
  flex-shrink: 0;
  width: 100%;
}

.card-bottom-actions {
  display: flex;
  justify-content: space-between;
  margin-top: auto;
  height: 44px;
  width: 100%;
}

.mastery-group {
  display: flex;
  gap: 8px;
}

.mastery-mini {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--bg-app);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: all 0.2s;
  color: var(--text-muted);
}

.mastery-mini.struggle { color: var(--danger); border-color: rgba(239, 68, 68, 0.3); }
.mastery-mini.mastered { color: var(--success); border-color: rgba(16, 185, 129, 0.3); }

.mastery-mini.struggle:hover, .mastery-mini.struggle.active-struggle {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.2);
}

.mastery-mini.mastered:hover, .mastery-mini.mastered.active-mastered {
  background: var(--success);
  color: white;
  border-color: var(--success);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.2);
}

.tts-btn {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--bg-app);
  color: var(--text-main);
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  transition: all 0.2s;
  cursor: pointer;
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.tts-btn.transparent {
  background: rgba(0,0,0,0.1);
  border: 1px solid rgba(0,0,0,0.2);
  opacity: 1;
}

[data-theme="dark"] .tts-btn.transparent {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
}

.tts-btn:hover {
  background: var(--accent);
  color: white;
  transform: scale(1.1);
  opacity: 1;
  border-color: var(--accent);
}

/* CARD CONTENT */
.card-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

#frontMain, #backMain {
  font-family: var(--f-serif);
  font-size: 80px;
  font-weight: 600;
  line-height: 1.1;
  margin-bottom: 15px;
  word-break: break-word;
  color: var(--primary);
  max-width: 100%;
  display: block;
}

#frontSub, #backExample {
  font-size: 20px;
  color: var(--text-muted);
  font-weight: 500;
  max-width: 80%;
}

#backExplain {
  margin-top: 30px;
  padding: 20px;
  background: rgba(99, 102, 241, 0.05);
  border-radius: var(--radius-md);
  font-size: 16px;
  line-height: 1.6;
  max-width: 90%;
  color: var(--text-main);
  border: 1px dashed var(--accent);
}

.auto-settings-inline {
  display: flex !important;
  gap: 15px;
  margin-top: 10px;
  animation: fadeIn 0.3s ease;
  justify-content: center;
}

.timer-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 800;
  color: var(--accent);
}

.timer-item input {
  width: 45px;
  height: 32px;
  background: var(--bg-app);
  border: 1px solid var(--accent);
  border-radius: 8px;
  color: var(--text-main);
  font-weight: 900;
  text-align: center;
  font-size: 14px;
}

.timer-item span {
  opacity: 0.6;
  font-size: 10px;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.edit-input-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.edit-input-group label {
    font-size: 11px;
    font-weight: 800;
    color: var(--text-muted);
    text-transform: uppercase;
}

.styled-input {
    background: var(--bg-app);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px;
    color: var(--text-main);
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}

.styled-input:focus {
    border-color: var(--accent);
}

.big-input {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 20px;
    width: 100%;
}

#authOverlay .modal-content {
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.stage-nav-btn, .mini-control-btn {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  color: var(--text-main);
  display: grid;
  place-items: center;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-soft);
  flex-shrink: 0;
  cursor: pointer;
}

.stage-nav-btn:hover, .mini-control-btn:hover {
  background: var(--primary);
  color: white !important;
  border-color: var(--primary);
  transform: translateY(-2px);
}

.mini-control-btn.active {
  background: var(--accent) !important;
  color: white !important;
  border-color: var(--accent);
}

.mini-control-btn i, .stage-nav-btn i {
  width: 20px;
  height: 20px;
}

@media (max-width: 768px) {
  .stage-nav-btn, .mini-control-btn {
    width: 44px;
    height: 44px;
  }
  .mini-control-btn i, .stage-nav-btn i {
    width: 18px;
    height: 18px;
  }
  .logo-type, .nav-link span {
    display: none !important;
  }
  .site-header {
    height: 56px;
  }
  .header-inner {
    padding: 0 16px;
  }
  .logo-group {
    gap: 8px;
    margin-left: 0;
  }
  .logo-mark {
    width: 30px;
    height: 30px;
    border-radius: 8px;
  }
  .header-nav {
    gap: 2px;
  }
  .nav-link {
    width: 32px;
    height: 32px;
    padding: 0;
    justify-content: center;
    border-radius: 8px;
    box-shadow: none;
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--border);
  }
  .nav-link:hover {
    background: var(--primary);
    color: white;
  }
  .btn-theme {
    background: #f59e0b !important;
    color: white !important;
  }
  .nav-link i {
    width: 16px;
    height: 16px;
  }
  .main-content {
    padding: 12px 10px 40px;
  }
  .learning-stage {
    margin-bottom: 20px;
  }
  .flashcard {
    aspect-ratio: 0.85 / 1;
  }
  #frontMain, #backMain {
    font-size: 42px;
  }
  .dashboard-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
    width: 100%;
    margin: 0 auto;
    align-items: center;
  }
  .dashboard-panel {
    padding: 16px;
    margin-bottom: 0;
    width: 100%;
    max-width: 100%; /* Match the width of the flashcard container */
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    border-radius: 20px;
    min-height: auto;
  }
  .dashboard-panel textarea {
    min-height: 100px;
    padding: 12px;
    font-size: 14px;
    border-radius: 12px;
  }
  .deck-list-container {
    gap: 10px;
  }
  .deck-card {
    padding: 20px;
    align-items: center;
    text-align: center;
    gap: 12px;
    border-radius: 16px;
    justify-content: center;
  }
  .deck-main-row {
     flex-direction: row;
     align-items: center;
  }
  .deck-name { 
    font-size: 18px; 
    margin-bottom: 0;
    text-align: center;
  }
  .deck-count { font-size: 11px; opacity: 0.7; }
  .panel-actions-group { 
    width: 100%; 
    justify-content: center; 
    border-top: 1px solid var(--border);
    padding-top: 8px;
    margin-top: 4px;
  }
  .panel-title {
    font-size: 15px;
    margin-bottom: 16px;
    justify-content: center;
  }
  
  /* Mobile: Improved tilt and slide transitions for a Quizlet-like feel */
  body .slide-next-out { animation: mobileSlideNextOut 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards !important; }
  body .slide-next-in { animation: mobileSlideNextIn 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards !important; }
  body .slide-prev-out { animation: mobileSlidePrevOut 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards !important; }
  body .slide-prev-in { animation: mobileSlidePrevIn 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards !important; }
  
  @keyframes mobileSlideNextOut { 
    to { transform: translateX(-120%) rotateY(-25deg) rotateZ(-10deg) scale(0.85); opacity: 0; } 
  }
  @keyframes mobileSlideNextIn { 
    from { transform: translateX(120%) rotateY(25deg) rotateZ(10deg) scale(0.85); opacity: 0; } 
    to { transform: translateX(0) rotateY(0) scale(1); opacity: 1; } 
  }
  @keyframes mobileSlidePrevOut { 
    to { transform: translateX(120%) rotateY(25deg) rotateZ(10deg) scale(0.85); opacity: 0; } 
  }
  @keyframes mobileSlidePrevIn { 
    from { transform: translateX(-120%) rotateY(-25deg) rotateZ(-10deg) scale(0.85); opacity: 0; } 
    to { transform: translateX(0) rotateY(0) scale(1); opacity: 1; } 
  }
}

.pop-click {
  animation: popClick 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes popClick {
  0% { transform: scale(1); }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

/* SMART DASHBOARD */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: 24px;
}

.dashboard-panel {
  background: var(--panel-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: 32px;
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  height: 480px; /* Increased height to show at least 3-4 decks and balancing the bulk input card */
}

#btnAddCard {
  margin-top: auto;
  margin-bottom: auto;
}

/* MODE BUTTONS (Filter: All, Learning, Mastered) */
.mode-btn {
  flex: 1;
  padding: 10px 16px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-app);
  color: var(--text-main);
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.mode-btn:hover {
  background: var(--panel-bg);
  border-color: var(--primary);
  transform: translateY(-1px);
}

.mode-btn.active {
  background: var(--primary) !important;
  color: white !important;
  border-color: var(--primary) !important;
  box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.3);
}

[data-theme="dark"] .mode-btn {
  background: rgba(255, 255, 255, 0.05);
}

.panel-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 24px;
}

.dashboard-panel textarea {
  background: var(--bg-app);
  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 20px;
  border-radius: var(--radius-md);
  margin-bottom: 0;
  font-size: 15px;
  flex: 1; /* Allow to fill space */
  min-height: 120px;
  resize: none;
  font-family: var(--f-sans);
  transition: all 0.3s ease;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
}

.dashboard-panel textarea:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 4px rgba(var(--primary-rgb), 0.1);
}

.btn-hero {
  background: linear-gradient(135deg, var(--accent), var(--primary));
  color: white;
  padding: 16px 24px;
  border-radius: var(--radius-md);
  font-weight: 800;
  font-size: 15px;
  box-shadow: 0 8px 20px -6px rgba(var(--primary-rgb), 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: all 0.3s;
  border: none;
  cursor: pointer;
}

.btn-hero:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px -8px rgba(79, 70, 229, 0.6);
  filter: brightness(1.1);
}

/* DECK LIST UX */
.deck-list-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  flex: 1;
  overflow-y: auto;
  padding-right: 4px;
  justify-content: flex-start;
  min-height: 200px;
}

/* If the container is nearly empty, we can center the content */
.deck-list-container:empty::after {
  content: "Chưa có học phần nào";
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
  padding: 40px 0;
  opacity: 0.5;
}

.deck-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px 20px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
  width: 100%;
  min-height: 70px;
  box-sizing: border-box;
  justify-content: center;
}

.deck-card:hover { 
  border-color: var(--accent); 
  background: var(--bg-app);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.deck-card.active { 
  border-color: var(--accent); 
  background: rgba(99, 102, 241, 0.05); 
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.15);
}

.deck-main-row {
  display: flex;
  justify-content: space-between;
  align-items: center; /* Vercital center */
  width: 100%;
}

.deck-name {
  font-weight: 900;
  font-size: 20px;
  color: var(--text-main);
  letter-spacing: -0.02em;
  flex: 1;
  text-align: left;
}

.deck-count {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 800;
  background: var(--bg-app);
  padding: 4px 12px;
  border-radius: 30px;
  text-transform: uppercase;
}

/* Sub-menu khi chọn học phần */
.deck-modes-submenu {
  display: none;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
  width: 100%;
}

.deck-card.active .deck-modes-submenu {
  display: grid;
  animation: slideInDown 0.3s ease-out;
}

.mini-mode-btn {
  background: var(--bg-app);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 4px;
  font-size: 10px;
  font-weight: 800;
  color: var(--text-muted);
  cursor: pointer;
  text-align: center;
  transition: all 0.2s;
  text-transform: uppercase;
}

.mini-mode-btn:hover { 
  color: var(--accent); 
  border-color: var(--accent); 
}

.mini-mode-btn.active { 
  background: var(--accent); 
  color: white; 
  border-color: var(--accent); 
}

@keyframes slideInDown { 
  from { opacity: 0; transform: translateY(-10px); } 
  to { opacity: 1; transform: translateY(0); } 
}

/* Modal Content Scaling Fix */
.modal-content {
  max-height: 90vh;
  display: flex;
  flex-direction: column;
}

.deck-list-container {
  overflow-y: auto;
  max-height: 60vh;
  padding-right: 8px;
}

.deck-list-container::-webkit-scrollbar { width: 5px; }
.deck-list-container::-webkit-scrollbar-thumb { background: var(--border); border-radius: 10px; }

/* Search Filter Buttons */
.filter-btn {
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  color: var(--text-muted);
}
.filter-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.filter-btn.active {
  background: var(--accent) !important;
  color: white !important;
  border-color: var(--accent) !important;
}

/* Site Header Extension */
.header-inner {
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  height: 100%;
}
#btnImportFileIcon {
  transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

#btnImportFileIcon:hover {
  transform: scale(1.15);
  color: var(--primary) !important;
}

#btnImportFileIcon:active {
  transform: scale(0.95);
}

#btnImportFileIcon i {
  filter: drop-shadow(0 2px 4px rgba(var(--primary-rgb), 0.2));
}

.search-result-item {
  padding: 18px;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  gap: 6px;
  box-shadow: var(--shadow-sm);
}

.search-result-item:hover {
  border-color: var(--accent);
  transform: translateX(8px);
  background: var(--bg-app);
  box-shadow: var(--shadow-md);
}

.search-result-front { font-weight: 900; color: var(--text-main); font-size: 18px; letter-spacing: -0.5px; }
.search-result-back { font-size: 14px; color: var(--text-muted); font-weight: 500; }
.search-result-set { font-size: 10px; font-weight: 900; color: var(--accent); text-transform: uppercase; letter-spacing: 1.5px; margin-top: 4px; }

.import-dashed-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 24px;
  border: 2px dashed var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s;
  color: var(--text-muted);
}

.import-dashed-area:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* PROGRESS BLOCK */
.card-controls-footer {
  width: 100%;
  max-width: 800px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-top: 20px;
  padding: 0 16px;
  position: relative;
}

.navigation-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
}

.central-controls {
  display: contents; /* Remove layout container, keep individual buttons */
}

.progress-text {
  background: var(--glass);
  border: 1px solid var(--border);
  padding: 6px 16px;
  border-radius: 20px;
  font-weight: 800;
  font-size: 13px;
  color: var(--primary);
  letter-spacing: 0.05em;
}

/* EDIT MODAL STYLES */
.card-editor-row {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 16px;
  background: var(--bg-app);
  padding: 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  margin-bottom: 8px;
}

.styled-input {
  width: 100%;
  padding: 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--panel-bg);
  color: var(--text-main);
  font-family: var(--f-sans);
  font-weight: 600;
}

/* OVERLAYS */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(2, 6, 23, 0.8);
  backdrop-filter: blur(12px);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-content {
  width: 100%;
  max-width: 540px;
  background: var(--panel-bg);
  border-radius: 32px;
  padding: 32px;
  display: flex;
  flex-direction: column;
  animation: slideTop 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-large { max-width: 1000px; height: 90vh; }
#editCardsList { flex: 1; overflow-y: auto; margin-bottom: 20px; }

@keyframes slideTop { from { opacity: 0; transform: translateY(40px); } to { opacity: 1; transform: translateY(0); } }

/* FULLSCREEN APP MODE */
.fullscreen-app { overflow: hidden; background: var(--bg-app); }
.fullscreen-app .site-header, .fullscreen-app .dashboard-grid, .fullscreen-app .auto-settings { display: none !important; }
.fullscreen-app .main-content { padding: 0; width: 100vw; height: 100vh; display: flex !important; flex-direction: column !important; align-items: center; justify-content: center; }
.fullscreen-app .learning-stage { width: 100%; height: 100%; margin: 0; padding: 40px 20px; }
.fullscreen-app .flashcard-container { flex: 1; width: 100%; max-width: 1000px; display: flex; flex-direction: column; justify-content: center; }
.fullscreen-app .flashcard { flex: 1; aspect-ratio: unset; }

.animating { pointer-events: none; }
.slide-next-out { animation: slideNextOut 0.25s forwards; }
.slide-next-in { animation: slideNextIn 0.25s forwards; }
.slide-prev-out { animation: slidePrevOut 0.25s forwards; }
.slide-prev-in { animation: slidePrevIn 0.25s forwards; }

@keyframes slideNextOut { to { transform: translateX(-40px); opacity: 0; } }
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* DICTIONARY STYLING */
.dict-entry {
    margin-bottom: 24px;
    animation: fadeIn 0.3s ease;
}

.dict-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    border-bottom: 2px solid var(--accent);
    padding-bottom: 12px;
    margin-bottom: 15px;
}

.main-kanji {
    width: 60px;
    height: 60px;
}

.dict-word {
    font-size: 28px;
    font-weight: 900;
    color: var(--accent);
}

.dict-reading {
    font-size: 16px;
    color: var(--text-main);
    opacity: 0.8;
    margin-left: 10px;
}

.dict-meaning {
    font-size: 16px;
    margin-bottom: 16px;
    line-height: 1.6;
}

.dict-section-title {
    font-size: 13px;
    font-weight: 900;
    text-transform: uppercase;
    color: var(--accent);
    letter-spacing: 1.5px;
    margin-bottom: 12px;
    margin-top: 24px;
    display: block;
    border-left: 3px solid var(--accent);
    padding-left: 8px;
}

.kanji-breakdown {
    display: grid;
    gap: 16px;
    background: rgba(var(--accent-rgb), 0.1);
    padding: 20px;
    border-radius: 16px;
    border: 1px solid rgba(var(--accent-rgb), 0.3);
}

.kanji-canvas {
    width: 80px;
    height: 80px;
    background: #fff;
    border: 2px solid var(--accent);
    border-radius: 12px;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s;
}

.kanji-canvas:hover {
    transform: scale(1.05);
}

.kanji-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    padding: 15px;
    background: rgba(var(--text-rgb), 0.03);
    border-radius: 12px;
    border: 1px solid var(--border);
    margin-bottom: 12px;
}

.kanji-info {
    flex: 1;
}

.kanji-meaning {
    font-weight: 800;
    font-size: 16px;
    color: var(--accent);
    margin-bottom: 4px;
}

.kanji-details {
    font-size: 13px;
    color: var(--text-main);
    line-height: 1.4;
}

.stroke-order-info {
    margin-top: 12px;
    padding: 10px;
    background: rgba(var(--accent-rgb), 0.08);
    border-radius: 8px;
    font-size: 13px;
    border-left: 4px solid var(--accent);
    color: var(--text-main);
}

.example-box {
    background: rgba(var(--text-rgb), 0.03);
    border-left: 4px solid var(--accent);
    padding: 12px;
    margin: 12px 0;
    border-radius: 0 8px 8px 0;
    color: var(--text-main);
}

#floatingLookupBtn:hover {
    transform: scale(1.1);
    background: var(--primary);
}

#floatingLookupBtn:active {
    transform: scale(0.9);
}

@keyframes fadeIn { from { opacity:0; transform: translateY(10px); } to { opacity:1; transform: translateY(0); } }

#popupSearchInput:focus,
#docSearchInput:focus {
    border-color: var(--primary) !important;
    box-shadow: 0 0 0 4px rgba(var(--primary-rgb), 0.1);
}

#popupSetList::-webkit-scrollbar,
#docList::-webkit-scrollbar {
    width: 4px;
}

#popupSetList::-webkit-scrollbar-thumb,
#docList::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 10px;
}

#popupSetList:hover::-webkit-scrollbar-thumb,
#docList:hover::-webkit-scrollbar-thumb {
    background: var(--text-muted);
}

/* DICT STYLES */
.dict-kanji-item {
    background: rgba(var(--accent-rgb), 0.05);
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 12px;
}

.dict-kanji-char {
    font-size: 32px;
    font-weight: bold;
    color: var(--accent);
    margin-right: 15px;
}

.loader {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top: 3px solid var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

#dictResult h3 {
    margin-bottom: 10px;
    font-size: 1.1rem;
    color: var(--accent);
}

#dictResult p {
    margin-bottom: 8px;
    line-height: 1.5;
}

.floating-btn-active {
    display: flex !important;
    animation: popIn 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes popIn {
    from { transform: scale(0); }
    to { transform: scale(1); }
}

/* KANJI ZOOM MODAL */
.kanji-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.85);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    backdrop-filter: blur(8px);
}

.kanji-modal.active {
    display: flex;
    animation: fadeIn 0.3s ease;
}

.kanji-modal-content {
    background: var(--panel-bg);
    padding: 30px;
    border-radius: 24px;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 90%;
    border: 1px solid var(--border);
}

.kanji-modal-close {
    position: absolute;
    top: -45px;
    right: 0;
    color: white;
    font-size: 32px;
    cursor: pointer;
    background: none;
    border: none;
    transition: transform 0.2s;
}

.kanji-modal-close:hover {
    transform: rotate(90deg);
}

.kanji-big-canvas {
    width: 250px;
    height: 250px;
    background: white;
    border-radius: 12px;
    padding: 10px;
}

.kanji-modal-char-info {
    margin-top: 20px;
    text-align: center;
}

.kanji-modal-char-info h2 {
    color: var(--accent);
    font-size: 24px;
    margin-bottom: 5px;
}

.kanji-modal-hint {
    margin-top: 15px;
    color: var(--text-muted);
    font-size: 14px;
    font-style: italic;
}