/* =========================================================
   GRE 34 Groups Master Flashcards - Stylesheet
   Modern Glassmorphism, Dynamic 3D Card Flip & Rich Accents
   ========================================================= */

:root,
body.light-theme {
  /* Color Palette - White / Light Theme Default (Easy on the eyes) */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  
  --border-subtle: #e2e8f0;
  --border-medium: #cbd5e1;
  --border-active: rgba(37, 99, 235, 0.4);

  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-accent: #2563eb;

  /* Rating System Colors - High legibility, calm tones */
  --rating-1: #059669; /* Mastered / Know */
  --rating-1-bg: rgba(5, 150, 105, 0.08);
  --rating-1-border: rgba(5, 150, 105, 0.28);
  --rating-1-glow: rgba(5, 150, 105, 0.15);

  --rating-2: #d97706; /* Occasionally forget / Review */
  --rating-2-bg: rgba(217, 119, 6, 0.08);
  --rating-2-border: rgba(217, 119, 6, 0.28);
  --rating-2-glow: rgba(217, 119, 6, 0.15);

  --rating-3: #dc2626; /* Hard to memorize */
  --rating-3-bg: rgba(220, 38, 38, 0.08);
  --rating-3-border: rgba(220, 38, 38, 0.28);
  --rating-3-glow: rgba(220, 38, 38, 0.15);

  --rating-unrated: #64748b;
  --rating-unrated-bg: rgba(100, 116, 139, 0.08);

  /* Whole Card Rating Backgrounds - Light transparent tints */
  --rating-card-1-bg: rgba(5, 150, 105, 0.13);
  --rating-card-2-bg: rgba(217, 119, 6, 0.13);
  --rating-card-3-bg: rgba(220, 38, 38, 0.13);

  /* Primary Brand - Calm, Focused Slate Blue (replaces purple) */
  --brand-primary: #2563eb;
  --brand-secondary: #1d4ed8;
  --brand-gradient: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  --brand-glow: rgba(37, 99, 235, 0.12);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 30px;

  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 14px -2px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 10px 25px -4px rgba(15, 23, 42, 0.09);
  --shadow-glow: 0 0 20px -3px rgba(37, 99, 235, 0.12);

  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.32s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Dark Theme Overrides */
body.dark-theme {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-tertiary: #1f293d;
  --bg-card: rgba(23, 32, 54, 0.85);
  --bg-card-hover: rgba(30, 41, 69, 0.95);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.16);
  --border-active: rgba(59, 130, 246, 0.45);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-accent: #60a5fa;

  --rating-1: #10b981;
  --rating-1-bg: rgba(16, 185, 129, 0.15);
  --rating-1-border: rgba(16, 185, 129, 0.45);
  --rating-1-glow: rgba(16, 185, 129, 0.3);

  --rating-2: #f59e0b;
  --rating-2-bg: rgba(245, 158, 11, 0.15);
  --rating-2-border: rgba(245, 158, 11, 0.45);
  --rating-2-glow: rgba(245, 158, 11, 0.3);

  --rating-3: #ef4444;
  --rating-3-bg: rgba(239, 68, 68, 0.15);
  --rating-3-border: rgba(239, 68, 68, 0.45);
  --rating-3-glow: rgba(239, 68, 68, 0.3);

  --rating-unrated: #64748b;
  --rating-unrated-bg: rgba(100, 116, 139, 0.12);

  /* Whole Card Rating Backgrounds - Dark theme transparent tints */
  --rating-card-1-bg: rgba(16, 185, 129, 0.20);
  --rating-card-2-bg: rgba(245, 158, 11, 0.20);
  --rating-card-3-bg: rgba(239, 68, 68, 0.20);

  --brand-primary: #3b82f6;
  --brand-secondary: #2563eb;
  --brand-gradient: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  --brand-glow: rgba(59, 130, 246, 0.25);

  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 20px 40px -10px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 35px -5px var(--brand-glow);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(37, 99, 235, 0.025) 0%, transparent 45%),
    radial-gradient(circle at 85% 85%, rgba(100, 116, 139, 0.03) 0%, transparent 45%);
  background-attachment: fixed;
  overflow-x: hidden;
  line-height: 1.6;
}

body.dark-theme {
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(59, 130, 246, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(30, 41, 59, 0.2) 0%, transparent 45%);
}

/* Scrollbars */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ================= Top Navigation Bar ================= */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.75rem 1.5rem;
}

body.dark-theme .app-header {
  background: rgba(11, 15, 25, 0.88);
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo {
  width: 40px;
  height: 40px;
  background: var(--brand-gradient);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 1.25rem;
  box-shadow: 0 4px 14px var(--brand-glow);
}

.brand-title-wrap h1 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #0f172a 0%, #334155 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

body.dark-theme .brand-title-wrap h1 {
  background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: var(--brand-glow);
  color: var(--text-accent);
  border: 1px solid var(--border-active);
  margin-left: 0.4rem;
}

/* Nav Tabs */
.nav-tabs {
  display: flex;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.25rem;
  gap: 0.25rem;
}

.nav-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.nav-tab-btn:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.nav-tab-btn.active {
  color: #ffffff;
  background: var(--brand-primary);
  box-shadow: 0 2px 8px var(--brand-glow);
}

/* Header Action Controls */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.btn-icon {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
  border-color: var(--border-medium);
}

/* ================= Main App Container ================= */
.app-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem;
  width: 100%;
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* ================= Subheader Controls ================= */
.deck-controls-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 0.9rem 1.4rem;
  box-shadow: var(--shadow-sm);
}

.group-selector-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.group-selector-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.custom-select {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.custom-select:focus {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px var(--brand-glow);
}

.deck-stats-pills {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.stat-pill {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.stat-pill:hover {
  transform: translateY(-1px);
}

.stat-pill.pill-green {
  background: var(--rating-1-bg);
  border: 1px solid var(--rating-1-border);
  color: var(--rating-1);
}
.stat-pill.pill-orange {
  background: var(--rating-2-bg);
  border: 1px solid var(--rating-2-border);
  color: var(--rating-2);
}
.stat-pill.pill-red {
  background: var(--rating-3-bg);
  border: 1px solid var(--rating-3-border);
  color: var(--rating-3);
}
.stat-pill.pill-unrated {
  background: var(--rating-unrated-bg);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
}

.deck-toggles {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toggle-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition-fast);
}

.toggle-btn:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.toggle-btn.active {
  background: var(--brand-glow);
  color: var(--text-accent);
  border-color: var(--brand-primary);
}

/* ================= View 1: Flashcards View ================= */
.view-flashcards {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
}

/* Progress Indicator */
.deck-progress-container {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.multi-progress-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-secondary);
  border-radius: 999px;
  display: flex;
  overflow: hidden;
  border: 1px solid var(--border-subtle);
}

.progress-segment {
  height: 100%;
  transition: width var(--transition-normal);
}
.progress-green { background: var(--rating-1); }
.progress-orange { background: var(--rating-2); }
.progress-red { background: var(--rating-3); }
.progress-unrated { background: transparent; }

/* 3D Flashcard Stage */
.flashcard-stage {
  width: 100%;
  perspective: 1200px;
  margin: 0.5rem 0;
}

.flashcard {
  width: 100%;
  min-height: 400px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
  cursor: pointer;
  border-radius: var(--radius-xl);
}

.flashcard.flipped {
  transform: rotateY(180deg);
}
/* Card Faces */
.card-face {
  position: absolute;
  width: 100%;
  height: 100%;
  min-height: 400px;
  top: 0;
  left: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  /*
   * background-color = opaque solid base (keeps backface-visibility working —
   * 3D culling requires the face to be opaque so nothing bleeds through).
   * background-image = the transparent rating tint layered on top of the solid base.
   * CSS renders background-image above background-color so the tint is visible,
   * but the overall rendered surface stays opaque and blocks the other face.
   */
  background-color: var(--bg-card);
  background-image: none;
  border: 2px solid var(--border-subtle);
  box-shadow: var(--shadow-lg);
  transition: background-image var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
  user-select: none;
}

.card-face-back {
  transform: rotateY(180deg);
}

/* Rating Tint: layered via background-image over a solid background-color base */
.flashcard.rated-1 .card-face {
  background-image: linear-gradient(var(--rating-card-1-bg), var(--rating-card-1-bg));
  border-color: var(--rating-1-border);
  box-shadow: var(--shadow-lg), 0 4px 25px var(--rating-1-glow);
}
.flashcard.rated-2 .card-face {
  background-image: linear-gradient(var(--rating-card-2-bg), var(--rating-card-2-bg));
  border-color: var(--rating-2-border);
  box-shadow: var(--shadow-lg), 0 4px 25px var(--rating-2-glow);
}
.flashcard.rated-3 .card-face {
  background-image: linear-gradient(var(--rating-card-3-bg), var(--rating-card-3-bg));
  border-color: var(--rating-3-border);
  box-shadow: var(--shadow-lg), 0 4px 25px var(--rating-3-glow);
}

.flashcard.rated-1 .definition-box {
  border-left-color: var(--rating-1);
}
.flashcard.rated-2 .definition-box {
  border-left-color: var(--rating-2);
}
.flashcard.rated-3 .definition-box {
  border-left-color: var(--rating-3);
}

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

.card-group-tag {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-accent);
  background: var(--brand-glow);
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  border: 1px solid var(--border-active);
}

.card-tag-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.multi-meaning-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.22rem 0.6rem;
  border-radius: 999px;
  background: rgba(124, 58, 237, 0.1);
  color: #7c3aed;
  border: 1px solid rgba(124, 58, 237, 0.25);
  box-shadow: 0 1px 2px rgba(124, 58, 237, 0.08);
  vertical-align: middle;
  transition: all var(--transition-fast);
}

body.dark-theme .multi-meaning-badge {
  background: rgba(167, 139, 250, 0.15);
  color: #c4b5fd;
  border-color: rgba(167, 139, 250, 0.32);
}

.card-rating-badge {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-1 { background: var(--rating-1-bg); color: var(--rating-1); border: 1px solid var(--rating-1-border); }
.badge-2 { background: var(--rating-2-bg); color: var(--rating-2); border: 1px solid var(--rating-2-border); }
.badge-3 { background: var(--rating-3-bg); color: var(--rating-3); border: 1px solid var(--rating-3-border); }
.badge-unrated { background: var(--rating-unrated-bg); color: var(--text-muted); border: 1px solid var(--border-subtle); }

/* Card Face Center (Front) */
.card-center-front {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem 1rem;
  gap: 1rem;
}

.vocab-word {
  font-family: var(--font-display);
  font-size: 3.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--text-primary);
  opacity: 1;
}

body.dark-theme .vocab-word {
  color: var(--text-primary);
  opacity: 1;
}

.word-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-speak {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  color: var(--text-secondary);
  height: 38px;
  padding: 0 0.85rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
  user-select: none;
}

.btn-speak .kbd-badge {
  font-size: 0.72rem;
  padding: 0.1rem 0.4rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  box-shadow: none;
}

.btn-speak:hover {
  color: var(--brand-primary);
  border-color: var(--brand-primary);
  background: var(--bg-tertiary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-speak:hover .kbd-badge {
  color: var(--brand-primary);
  border-color: var(--brand-primary);
}

.btn-speak.speaking {
  color: var(--brand-primary);
  border-color: var(--brand-primary);
  background: var(--brand-glow);
  transform: scale(1.05);
  box-shadow: 0 0 14px var(--brand-glow);
}

.back-word-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  width: 100%;
}

.btn-speak-sm {
  height: 32px;
  padding: 0 0.65rem;
  font-size: 0.8rem;
}

/* Card Face Center (Back) */
.card-center-back {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 1rem 0;
  overflow-y: auto;
  max-height: 280px;
}

.back-word-title {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-primary);
}

.definition-box {
  font-size: 1.15rem;
  line-height: 1.65;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.88);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  border-left: 4px solid var(--brand-primary);
  opacity: 1;
}

body.dark-theme .definition-box {
  background: rgba(15, 23, 42, 0.7);
  border-color: rgba(255, 255, 255, 0.08);
}

/* Multi-line Definitions Formatting for Multiple Meanings */
.def-multiline {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  width: 100%;
}

.def-line {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
  line-height: 1.55;
}

.def-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--brand-primary);
  background: var(--brand-glow);
  border: 1px solid rgba(37, 99, 235, 0.25);
  min-width: 1.6rem;
  height: 1.45rem;
  padding: 0 0.3rem;
  border-radius: 6px;
  flex-shrink: 0;
  text-align: center;
  user-select: none;
}

body.dark-theme .def-num {
  background: rgba(96, 165, 250, 0.15);
  color: #93c5fd;
  border-color: rgba(96, 165, 250, 0.3);
}

/* Match definition number badge to rated card status if rated */
.flashcard.rated-1 .def-num {
  color: var(--rating-1);
  background: var(--rating-1-bg);
  border-color: var(--rating-1-border);
}
.flashcard.rated-2 .def-num {
  color: var(--rating-2);
  background: var(--rating-2-bg);
  border-color: var(--rating-2-border);
}
.flashcard.rated-3 .def-num {
  color: var(--rating-3);
  background: var(--rating-3-bg);
  border-color: var(--rating-3-border);
}

.def-text {
  flex: 1;
  word-break: break-word;
}

/* Compact definitions for lists, tables, and modal cards */
.def-multiline-compact {
  gap: 0.4rem;
}

.def-multiline-compact .def-line {
  gap: 0.45rem;
  line-height: 1.45;
}

.def-multiline-compact .def-num {
  font-size: 0.72rem;
  min-width: 1.35rem;
  height: 1.25rem;
  padding: 0 0.2rem;
  border-radius: 4px;
}

.similar-words-box {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.similar-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.synonym-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.synonym-chip {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.synonym-chip:hover {
  border-color: var(--brand-primary);
  color: var(--text-primary);
}

/* Card Face Footer */
.card-face-footer {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
}

.flip-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.kbd-badge {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* ================= Rating Action Buttons (1, 2, 3) ================= */
.rating-action-bar {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 0.5rem;
}

.btn-rate {
  flex: 1;
  max-width: 260px;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.btn-rate:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-rate.active {
  transform: translateY(-2px);
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.4);
}

/* Rate 1 Button: Green */
.btn-rate-1 {
  background: var(--rating-1-bg);
  color: var(--rating-1);
  border-color: var(--rating-1-border);
}
.btn-rate-1:hover, .btn-rate-1.active {
  background: var(--rating-1);
  color: #ffffff;
  border-color: var(--rating-1);
  box-shadow: 0 4px 18px var(--rating-1-glow);
}

/* Rate 2 Button: Orange */
.btn-rate-2 {
  background: var(--rating-2-bg);
  color: var(--rating-2);
  border-color: var(--rating-2-border);
}
.btn-rate-2:hover, .btn-rate-2.active {
  background: var(--rating-2);
  color: #ffffff;
  border-color: var(--rating-2);
  box-shadow: 0 4px 18px var(--rating-2-glow);
}

/* Rate 3 Button: Red */
.btn-rate-3 {
  background: var(--rating-3-bg);
  color: var(--rating-3);
  border-color: var(--rating-3-border);
}
.btn-rate-3:hover, .btn-rate-3.active {
  background: var(--rating-3);
  color: #ffffff;
  border-color: var(--rating-3);
  box-shadow: 0 4px 18px var(--rating-3-glow);
}

.rate-num-badge {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  background: rgba(0, 0, 0, 0.06);
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  border: 1px solid currentColor;
}

body.dark-theme .rate-num-badge {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

/* ================= Flashcard Navigation Controls ================= */
.flashcard-nav-bar {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.btn-nav {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  transition: all var(--transition-fast);
}

.btn-nav:hover:not(:disabled) {
  background: var(--bg-tertiary);
  border-color: var(--brand-primary);
  transform: translateY(-1px);
}

.btn-nav:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-flip-trigger {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  transition: all var(--transition-fast);
}

.btn-flip-trigger:hover {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
}

/* Keyboard Guide Legend */
.keyboard-guide-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.25rem;
  padding: 0.75rem 1.5rem;
  background: rgba(0, 0, 0, 0.025);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  font-size: 0.8rem;
  color: var(--text-muted);
}

body.dark-theme .keyboard-guide-bar {
  background: rgba(0, 0, 0, 0.2);
}

.key-hint {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* ================= View 2: Rated Words Practice ================= */
.view-rated-practice {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  width: 100%;
}

.rated-filter-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
}

.filter-pills-row {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.filter-tab-pill {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.filter-tab-pill:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.filter-tab-pill.active {
  color: #fff;
}
.filter-tab-pill.active[data-filter="all"] {
  background: var(--brand-primary);
  border-color: var(--brand-primary);
}
.filter-tab-pill.active[data-filter="3"] {
  background: var(--rating-3);
  border-color: var(--rating-3);
  box-shadow: 0 2px 10px var(--rating-3-glow);
}
.filter-tab-pill.active[data-filter="2"] {
  background: var(--rating-2);
  border-color: var(--rating-2);
  box-shadow: 0 2px 10px var(--rating-2-glow);
}
.filter-tab-pill.active[data-filter="1"] {
  background: var(--rating-1);
  border-color: var(--rating-1);
  box-shadow: 0 2px 10px var(--rating-1-glow);
}
.filter-tab-pill.active[data-filter="hard"] {
  background: linear-gradient(135deg, var(--rating-3), var(--rating-2));
  border-color: var(--rating-3);
}

/* Practice Flashcard Wrapper in Rated Mode */
.rated-practice-card-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
  gap: 1.5rem;
}

/* Grid View for Rated Words */
.rated-words-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  width: 100%;
}

.rated-word-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.8rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.rated-word-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-active);
  box-shadow: var(--shadow-md);
}

.rated-word-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 5px;
  height: 100%;
}
.rated-word-card.card-r1::before { background: var(--rating-1); }
.rated-word-card.card-r2::before { background: var(--rating-2); }
.rated-word-card.card-r3::before { background: var(--rating-3); }

.rated-word-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.rated-card-word {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
}

.rated-card-def {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ================= View 3: Similar Words & Synonym Clusters ================= */
.view-similar-clusters {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  width: 100%;
}

.clusters-hero {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.06) 0%, rgba(14, 165, 233, 0.04) 100%);
  border: 1px solid rgba(37, 99, 235, 0.18);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.clusters-hero-text h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.clusters-hero-text p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.clusters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 1.5rem;
  width: 100%;
}

.cluster-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.cluster-card:hover {
  border-color: var(--brand-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.cluster-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.cluster-theme-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-accent);
}

.cluster-notes {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
  background: rgba(0, 0, 0, 0.15);
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--brand-secondary);
}

.cluster-words-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.cluster-word-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.cluster-word-item:hover {
  background: var(--bg-tertiary);
  border-color: var(--brand-primary);
}

.cluster-word-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.cluster-word-name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.cluster-word-def {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

/* ================= View 4: Search & All Words Directory ================= */
.view-directory {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  width: 100%;
}

.directory-search-bar {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.search-input-wrap {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 1rem;
  color: var(--text-muted);
  pointer-events: none;
}

.search-input {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem 0.85rem 2.8rem;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1rem;
  outline: none;
  transition: all var(--transition-fast);
}

.search-input:focus {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px var(--brand-glow);
}

.directory-table-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.directory-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.directory-table th {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
}

.directory-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.95rem;
}

.directory-table tr:hover td {
  background: var(--bg-tertiary);
}

/* ================= Modals ================= */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  max-width: 600px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.modal-header h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
}

.modal-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* Card Navigator Grid in Modal */
.card-nav-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.6rem;
}

.nav-grid-item {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.4rem;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.nav-grid-item:hover {
  border-color: var(--brand-primary);
  transform: translateY(-2px);
}

.nav-grid-item.current {
  border-color: #ffffff;
  background: var(--brand-glow);
}

.nav-grid-item.item-r1 { border-color: var(--rating-1); color: var(--rating-1); }
.nav-grid-item.item-r2 { border-color: var(--rating-2); color: var(--rating-2); }
.nav-grid-item.item-r3 { border-color: var(--rating-3); color: var(--rating-3); }

/* ================= View 5: Custom Words (Big Book) ================= */
.view-custom-words {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  width: 100%;
}

.custom-words-hero {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.08) 0%, rgba(37, 99, 235, 0.06) 100%);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.custom-hero-text h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.custom-hero-text p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.custom-hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn-primary-action {
  background: var(--brand-primary);
  color: #ffffff;
  border: none;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 12px var(--brand-glow);
}

.btn-primary-action:hover {
  background: var(--brand-secondary);
  transform: translateY(-1px);
}

.custom-add-card {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
}

.custom-add-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.custom-form-grid {
  display: grid;
  grid-template-columns: 1fr 2fr 1.5fr auto;
  gap: 0.75rem;
  align-items: end;
}

@media (max-width: 900px) {
  .custom-form-grid {
    grid-template-columns: 1fr;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.form-input {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-input:focus {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px var(--brand-glow);
}

.custom-words-list-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.custom-words-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1rem;
  width: 100%;
}

.custom-word-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.85rem;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.custom-word-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-active);
  box-shadow: var(--shadow-md);
}

.custom-word-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 5px;
  height: 100%;
}
.custom-word-card.card-r1::before { background: var(--rating-1); }
.custom-word-card.card-r2::before { background: var(--rating-2); }
.custom-word-card.card-r3::before { background: var(--rating-3); }
.custom-word-card.card-r0::before { background: var(--border-medium); }

.custom-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.custom-card-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.custom-card-def {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.custom-card-notes {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-style: italic;
  background: rgba(0, 0, 0, 0.15);
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
}

.custom-card-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-subtle);
  padding-top: 0.75rem;
  margin-top: 0.25rem;
}

.custom-card-rating-btns {
  display: flex;
  gap: 0.35rem;
}

.btn-mini-rate {
  border: 1px solid transparent;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.btn-mini-rate.active-r1 { background: var(--rating-1); color: #fff; }
.btn-mini-rate.active-r2 { background: var(--rating-2); color: #fff; }
.btn-mini-rate.active-r3 { background: var(--rating-3); color: #fff; }

.btn-mini-del {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.3rem;
  border-radius: 4px;
  transition: all var(--transition-fast);
}

.btn-mini-del:hover {
  color: #f87171;
  background: rgba(239, 68, 68, 0.1);
}

/* ================= Similar Words Sub-Navigation Toggle ================= */
.similar-subnav-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1rem 1.5rem;
}

.similar-segmented-control {
  display: flex;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.25rem;
  gap: 0.35rem;
}

.similar-seg-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.similar-seg-btn:hover {
  color: var(--text-primary);
}

.similar-seg-btn.active {
  background: var(--brand-primary);
  color: #ffffff;
  box-shadow: 0 2px 8px var(--brand-glow);
}

.cluster-group-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  background: var(--brand-glow);
  color: var(--text-accent);
  border: 1px solid var(--border-active);
}

/* ================= Responsive Breakpoints ================= */
@media (max-width: 768px) {
  .app-header {
    padding: 0.6rem 1rem;
  }
  .header-inner {
    flex-wrap: wrap;
  }
  .nav-tabs {
    width: 100%;
    order: 3;
    justify-content: space-around;
  }
  .nav-tab-btn {
    padding: 0.4rem 0.6rem;
    font-size: 0.78rem;
  }
  .vocab-word {
    font-size: 2.4rem;
  }
  .card-face {
    min-height: 360px;
    padding: 1.5rem;
  }
  .rating-action-bar {
    flex-direction: column;
    width: 100%;
  }
  .btn-rate {
    max-width: 100%;
    width: 100%;
  }
  .clusters-grid {
    grid-template-columns: 1fr;
  }
  .card-nav-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ================================================================
   FOCUS MODE
   When body.focus-mode is set, everything outside the flashcard
   fades / blurs so the card is the sole focus.
================================================================ */

/* Transition for elements that fade in/out */
.app-header,
.deck-controls-bar,
.deck-progress-container,
.rating-action-bar,
.flashcard-nav-bar,
.keyboard-guide-bar {
  transition: opacity 0.4s ease, filter 0.4s ease, transform 0.4s ease;
}

/* ---- Focus Mode Active ---- */
body.focus-mode .app-header {
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
}

body.focus-mode .deck-controls-bar {
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
}

body.focus-mode .deck-progress-container {
  opacity: 0;
  pointer-events: none;
}

body.focus-mode .rating-action-bar {
  opacity: 0.08;
  filter: blur(2px);
  pointer-events: none;
}

body.focus-mode .flashcard-nav-bar {
  opacity: 0.08;
  filter: blur(2px);
  pointer-events: none;
}

body.focus-mode .keyboard-guide-bar {
  opacity: 0;
  pointer-events: none;
}

/* Flashcard stage gets more vertical breathing room */
body.focus-mode .flashcard-stage {
  margin-top: 0.5rem;
  padding: 0 1rem;
}

/* The flashcard itself gets a subtle lift/glow to feel prominent */
body.focus-mode .flashcard {
  box-shadow: 0 24px 80px rgba(0,0,0,0.14), 0 8px 32px rgba(0,0,0,0.08);
  transform-origin: center center;
}

/* In dark mode the glow is more visible */
body.dark-theme.focus-mode .flashcard {
  box-shadow: 0 24px 80px rgba(0,0,0,0.4), 0 0 0 1px rgba(255,255,255,0.06);
}

/* ---- Rating bar and nav bar: hover restores them ---- */
body.focus-mode .rating-action-bar:hover,
body.focus-mode .flashcard-nav-bar:hover {
  opacity: 0.65;
  filter: blur(0);
  pointer-events: auto;
  transition: opacity 0.2s ease, filter 0.2s ease;
}

/* ---- Floating Exit Focus Pill ---- */
.focus-exit-pill {
  display: none; /* hidden by default */
  position: fixed;
  bottom: 1.6rem;
  right: 1.6rem;
  z-index: 9999;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem 0.5rem 0.75rem;
  background: rgba(30, 30, 46, 0.88);
  color: #e2e8f0;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  backdrop-filter: blur(12px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.22);
  transition: opacity 0.25s ease, transform 0.25s ease;
  opacity: 0;
  transform: translateY(10px);
}

body.focus-mode .focus-exit-pill {
  display: flex;
  opacity: 1;
  transform: translateY(0);
}

.focus-exit-pill:hover {
  background: rgba(50, 50, 70, 0.95);
  transform: translateY(-2px) !important;
}

/* Dark theme pill — already dark, just invert text slightly */
body.light-theme .focus-exit-pill {
  background: rgba(24, 24, 37, 0.9);
  color: #f1f5f9;
}

/* ---- Settings Toggle Switch (Focus Mode) ---- */
.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.25rem 0;
}

.setting-info {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.setting-label {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.setting-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.focus-toggle-switch {
  position: relative;
  flex-shrink: 0;
  width: 48px;
  height: 26px;
  background: var(--border-subtle);
  border: none;
  border-radius: 9999px;
  cursor: pointer;
  transition: background 0.25s ease;
  padding: 0;
}

.focus-toggle-switch.active {
  background: var(--accent);
}

.focus-toggle-knob {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 1px 4px rgba(0,0,0,0.25);
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: none;
}

.focus-toggle-switch.active .focus-toggle-knob {
  transform: translateX(22px);
}