/* ==========================================
   DESIGN TOKENS & RESET
   ========================================== */
:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;

  /* Coolors neutral palette: f8f9fa-e9ecef-dee2e6-ced4da-adb5bd-6c757d-495057-343a40-212529 */
  --gray-0: #f8f9fa;
  --gray-1: #e9ecef;
  --gray-2: #dee2e6;
  --gray-3: #ced4da;
  --gray-4: #adb5bd;
  --gray-5: #6c757d;
  --gray-6: #495057;
  --gray-7: #343a40;
  --gray-8: #212529;

  --bg-app: var(--gray-0);
  --bg-app-rgb: 248, 249, 250;
  --bg-sidebar: var(--gray-0);
  --bg-surface: var(--gray-0);
  --bg-surface-solid: var(--gray-0);
  --bg-surface-hover: var(--gray-1);
  --bg-control: var(--gray-0);
  --bg-active: var(--gray-1);
  --border-glow: var(--gray-2);
  --border-glow-active: var(--gray-5);

  --accent-gold: var(--gray-7);
  --accent-gold-rgb: 52, 58, 64;
  --accent-ink: var(--gray-8);
  --accent-ink-rgb: 33, 37, 41;
  --accent-red: #c92a2a;
  --accent-red-rgb: 220, 38, 38;

  --color-success: #1a7f37;
  --color-success-bg: rgba(26, 127, 55, 0.1);
  --color-success-border: rgba(26, 127, 55, 0.35);
  --color-danger: #cf222e;
  --color-danger-bg: rgba(207, 34, 46, 0.1);
  --color-danger-border: rgba(207, 34, 46, 0.35);
  --color-warning: var(--gray-7);
  --color-warning-bg: rgba(108, 117, 125, 0.12);

  --text-primary: var(--gray-8);
  --text-secondary: var(--gray-6);
  --text-muted: var(--gray-5);

  --glass-blur: blur(10px);
  --shadow-sm: 0 1px 2px rgba(33, 37, 41, 0.08);
  --shadow-md: 0 8px 20px rgba(33, 37, 41, 0.08);
  --shadow-lg: 0 16px 34px rgba(33, 37, 41, 0.10);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-full: 9999px;
  
  /* Timing for safe mobile viewports */
  --sab: env(safe-area-inset-bottom, 0px);
  --sat: env(safe-area-inset-top, 0px);
}

:root[data-theme="dark"] {
  --bg-app: var(--gray-8);
  --bg-app-rgb: 33, 37, 41;
  --bg-sidebar: var(--gray-8);
  --bg-surface: var(--gray-7);
  --bg-surface-solid: var(--gray-8);
  --bg-surface-hover: var(--gray-6);
  --bg-control: var(--gray-8);
  --bg-active: var(--gray-6);
  --border-glow: var(--gray-6);
  --border-glow-active: var(--gray-4);
  --accent-gold: var(--gray-1);
  --accent-ink: var(--gray-0);
  --text-primary: var(--gray-0);
  --text-secondary: var(--gray-3);
  --text-muted: var(--gray-4);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 20px rgba(0, 0, 0, 0.22);
  --shadow-lg: 0 16px 34px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-primary);
  overflow-x: hidden;
  height: 100vh;
  width: 100vw;
  display: flex;
  flex-direction: column;
}

/* Custom Scrollbar styling */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: rgba(33, 37, 41, 0.5);
}
::-webkit-scrollbar-thumb {
  background: rgba(248, 249, 250, 0.15);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(248, 249, 250, 0.25);
}

/* ==========================================
   LAYOUT STRUCTURE
   ========================================== */
.app-container {
  display: flex;
  flex-direction: row;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  background-color: var(--bg-app);
}

.sidebar {
  width: 280px;
  background-color: rgba(33, 37, 41, 0.8);
  border-right: 1px solid var(--border-glow);
  backdrop-filter: var(--glass-blur);
  display: flex;
  flex-direction: column;
  padding: 32px 24px;
  z-index: 100;
  transition: transform var(--transition-normal);
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 48px;
}

.logo-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background-image: url('assets/icon.png');
  background-size: cover;
  background-position: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(248, 249, 250, 0.1);
}

.logo-text {
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: 0;
  line-height: 1.15;
  background: linear-gradient(135deg, var(--gray-0) 30%, var(--accent-gold) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav-item button {
  width: 100%;
  background: none;
  border: 1px solid transparent;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 16px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-item button svg {
  width: 20px;
  height: 20px;
  stroke: var(--text-secondary);
  stroke-width: 2px;
  fill: none;
  display: block;
  flex-shrink: 0;
  transition: stroke var(--transition-fast);
}

.nav-item button:hover {
  background-color: var(--bg-surface-hover);
  color: var(--text-primary);
}

.nav-item button:hover svg {
  stroke: var(--text-primary);
}

.nav-item.active button {
  background: linear-gradient(135deg, rgba(33, 37, 41, 0.15) 0%, rgba(108, 117, 125, 0.05) 100%);
  border-color: rgba(33, 37, 41, 0.3);
  color: var(--text-primary);
}

.nav-item.active button svg {
  stroke: var(--accent-gold);
}

.app-content {
  flex: 1;
  height: 100%;
  overflow-y: auto;
  padding: 40px;
  display: flex;
  flex-direction: column;
}

/* ==========================================
   SCREENS & PAGES
   ========================================== */
.view-panel {
  display: none;
  flex-direction: column;
  gap: 32px;
  animation: fadeIn var(--transition-normal);
}

.view-panel.active {
  display: flex;
}

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

.header-title h1 {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 6px;
}

.header-title p {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* ==========================================
   DASHBOARD VIEW
   ========================================== */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1.8fr 1.2fr;
  gap: 32px;
  align-items: start;
}

.dashboard-main {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.dashboard-sidebar {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* Glassmorphic Cards */
.glass-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-glow);
  backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.glass-card:hover {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-md);
}

/* Readiness Meter Display */
.readiness-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
}

.radial-progress-svg {
  width: 200px;
  height: 200px;
  transform: rotate(-90deg);
}

.radial-bg {
  fill: none;
  stroke: rgba(248, 249, 250, 0.04);
  stroke-width: 14;
}

.radial-fill {
  fill: none;
  stroke: url(#readiness-gradient);
  stroke-width: 14;
  stroke-linecap: round;
  stroke-dasharray: 565.48; /* 2 * PI * r (r=90) */
  stroke-dashoffset: 565.48;
  transition: stroke-dashoffset var(--transition-slow) ease-out;
}

.readiness-text-overlay {
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.readiness-percent {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  line-height: 1;
}

.readiness-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-top: 4px;
}

.readiness-rating {
  font-size: 1.15rem;
  font-weight: 700;
  margin-top: 14px;
  background: linear-gradient(135deg, var(--accent-gold) 0%, var(--accent-red) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* State selector dropdown */
.state-picker-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.state-select-wrapper {
  position: relative;
}

.state-select {
  width: 100%;
  background-color: rgba(33, 37, 41, 0.7);
  border: 1px solid var(--border-glow);
  color: var(--text-primary);
  padding: 16px 20px;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  appearance: none;
  transition: all var(--transition-fast);
}

.state-select:focus {
  outline: none;
  border-color: var(--accent-ink);
  box-shadow: 0 0 0 3px rgba(33, 37, 41, 0.15);
}

.state-select-wrapper::after {
  content: '▼';
  font-size: 0.75rem;
  color: var(--text-secondary);
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
}

/* Quick Stats Row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 20px;
}

.stat-box {
  background-color: rgba(33, 37, 41, 0.4);
  border: 1px solid rgba(248, 249, 250, 0.04);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat-box-value {
  font-size: 1.8rem;
  font-weight: 800;
}

.stat-box-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Dashboard Actions */
.dashboard-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.action-btn-card {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  cursor: pointer;
  border: 1px solid var(--border-glow);
  background-color: var(--bg-surface);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
  text-align: left;
}

.action-btn-card:hover {
  transform: translateY(-4px);
  border-color: rgba(33, 37, 41, 0.4);
  background-color: var(--bg-surface-hover);
}

.action-icon-circle {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(248, 249, 250, 0.03);
  margin-bottom: 8px;
}

.action-icon-circle svg {
  width: 24px;
  height: 24px;
  stroke: var(--accent-gold);
  stroke-width: 2px;
  fill: none;
}

.action-btn-card:hover .action-icon-circle {
  background-color: rgba(33, 37, 41, 0.15);
}

.action-btn-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
}

.action-btn-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* ==========================================
   FLASHCARD SYSTEM (PRACTICE / SPACED REPETITION)
   ========================================== */
.practice-container {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 32px;
  align-items: start;
}

.practice-start-card {
  max-width: 720px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.practice-start-card h2 {
  font-size: 1.25rem;
  margin-bottom: 6px;
}

.practice-start-card p {
  color: var(--text-secondary);
  line-height: 1.5;
}

.practice-start-controls {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) auto;
  gap: 12px;
  align-items: center;
}

.practice-active-group {
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 800;
  padding: 6px 10px;
  text-transform: uppercase;
}

.card-deck-section {
  display: flex;
  flex-direction: column;
  gap: 24px;
  align-items: center;
  width: 100%;
}

.practice-controls-header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 4px;
}

.category-tag {
  background: linear-gradient(135deg, rgba(33, 37, 41, 0.15) 0%, rgba(108, 117, 125, 0.05) 100%);
  border: 1px solid rgba(33, 37, 41, 0.25);
  color: var(--text-primary);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-actions-row {
  display: flex;
  gap: 12px;
}

.icon-btn {
  background-color: rgba(248, 249, 250, 0.03);
  border: 1px solid var(--border-glow);
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  background-color: var(--bg-surface-hover);
  color: var(--text-primary);
  border-color: var(--border-glow-active);
}

.icon-btn.active {
  background-color: rgba(108, 117, 125, 0.15);
  border-color: var(--accent-gold);
  color: var(--accent-gold);
}

.icon-btn svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
}

/* The Flashcard itself */
.flashcard {
  width: 100%;
  min-height: 480px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.question-text-box {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.question-number {
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--accent-gold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.question-text {
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -0.01em;
}

.question-translation {
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--text-secondary);
  font-style: italic;
  border-left: 2px solid rgba(248, 249, 250, 0.15);
  padding-left: 16px;
  margin-top: 8px;
  display: none;
}

.question-translation.visible {
  display: block;
}

/* Question Images style */
.question-image-container {
  width: 100%;
  display: flex;
  justify-content: center;
  margin: 16px 0;
}

.question-image {
  max-width: 100%;
  max-height: 150px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(248, 249, 250, 0.08);
  box-shadow: var(--shadow-sm);
}

/* Options Container */
.options-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: auto;
}

.option-item {
  width: 100%;
  background-color: rgba(33, 37, 41, 0.5);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  text-align: left;
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--text-primary);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  transition: all var(--transition-fast);
}

.option-item:hover {
  background-color: var(--bg-surface-hover);
  border-color: var(--border-glow-active);
}

.option-badge {
  font-size: 0.85rem;
  background-color: rgba(248, 249, 250, 0.04);
  border: 1px solid var(--border-glow);
  width: 26px;
  height: 26px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.option-item:hover .option-badge {
  color: var(--text-primary);
  background-color: rgba(248, 249, 250, 0.08);
}

/* Option states */
.option-item.selected {
  background-color: var(--bg-active);
  border-color: var(--border-glow-active);
}

.option-item.selected .option-badge {
  background-color: var(--accent-ink);
  border-color: var(--accent-ink);
  color: var(--bg-app);
}

.option-item.correct {
  background-color: var(--color-success-bg);
  border-color: var(--color-success);
  color: var(--text-primary);
}

.option-item.correct .option-badge {
  background-color: var(--color-success);
  border-color: var(--color-success);
  color: var(--gray-0);
}

.option-item.incorrect {
  background-color: var(--color-danger-bg);
  border-color: var(--color-danger);
}

.option-item.incorrect .option-badge {
  background-color: var(--color-danger);
  border-color: var(--color-danger);
  color: var(--gray-0);
}

.option-item.disabled {
  pointer-events: none;
}

/* Translation toggle selection overlay */
.lang-selector-overlay {
  display: flex;
  align-items: center;
  gap: 8px;
}

.lang-select {
  background-color: rgba(33, 37, 41, 0.8);
  border: 1px solid var(--border-glow);
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-select:focus {
  outline: none;
  border-color: var(--accent-gold);
}

/* Practice Navigation Row */
.practice-nav-row {
  display: flex;
  justify-content: space-between;
  width: 100%;
  margin-top: 8px;
}

.text-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: color var(--transition-fast);
}

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

.text-btn.disabled,
.text-btn[aria-disabled="true"] {
  color: var(--text-muted);
  cursor: not-allowed;
  opacity: 0.55;
}

.text-btn svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
}

/* Side Stats Drawer for Practice */
.practice-sidebar-card {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.sidebar-stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid rgba(248, 249, 250, 0.03);
}

.sidebar-stat-row:last-child {
  border-bottom: none;
}

.sidebar-stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.sidebar-stat-val {
  font-size: 1rem;
  font-weight: 700;
}

.failed-bucket-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 6px;
}

.failed-bucket-row {
  width: 100%;
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-sm);
  background: var(--bg-control);
  color: var(--text-secondary);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  text-align: left;
  font: inherit;
  cursor: pointer;
  transition: border-color var(--transition-fast), color var(--transition-fast), background-color var(--transition-fast);
}

.failed-bucket-row:hover,
.failed-bucket-row:focus-visible {
  background-color: var(--bg-surface-hover);
  border-color: var(--border-glow);
  color: var(--text-primary);
  outline: none;
}

.failed-bucket-row span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.failed-bucket-row strong {
  min-width: 28px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-hover);
  color: var(--color-danger);
  font-size: 0.82rem;
  line-height: 1;
  padding: 6px 8px;
  text-align: center;
}

.failed-bucket-empty {
  border: 1px dashed var(--border-glow);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.45;
  padding: 12px;
}

/* Sliding Explanation Drawer */
.explanation-drawer {
  position: fixed;
  top: 0;
  right: -420px;
  width: 420px;
  height: 100vh;
  background-color: var(--bg-surface-solid);
  border-left: 1px solid var(--border-glow);
  box-shadow: var(--shadow-lg);
  backdrop-filter: var(--glass-blur);
  z-index: 1000;
  padding: calc(40px + var(--sat)) 32px calc(40px + var(--sab));
  display: flex;
  flex-direction: column;
  gap: 24px;
  overflow-y: auto;
  transition: right var(--transition-slow);
}

.explanation-drawer.open {
  right: 0;
}

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

.drawer-header h2 {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.drawer-content {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.drawer-content p {
  background-color: rgba(248, 249, 250, 0.02);
  border: 1px solid rgba(248, 249, 250, 0.04);
  border-radius: var(--radius-md);
  padding: 20px;
}

.drawer-content h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  color: var(--accent-gold);
  letter-spacing: 0.05em;
  font-weight: 800;
}

.drawer-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(33, 37, 41, 0.7);
  backdrop-filter: blur(4px);
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.drawer-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

/* ==========================================
   MOCK EXAM SCREEN
   ========================================== */
.exam-container {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 32px;
  align-items: start;
}

.exam-main-panel {
  display: flex;
  flex-direction: column;
  gap: 24px;
  width: 100%;
}

.exam-nav-grid {
  display: grid;
  grid-template-columns: repeat(11, 1fr);
  gap: 8px;
}

.exam-nav-dot {
  aspect-ratio: 1;
  background-color: rgba(248, 249, 250, 0.03);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.exam-nav-dot:hover {
  background-color: var(--bg-surface-hover);
  color: var(--text-primary);
}

.exam-nav-dot.active {
  border-color: var(--accent-ink);
  background-color: rgba(33, 37, 41, 0.15);
  color: var(--text-primary);
}

.exam-nav-dot.answered {
  background-color: rgba(248, 249, 250, 0.15);
  color: var(--text-primary);
}

.exam-nav-dot.active.answered {
  background-color: rgba(33, 37, 41, 0.25);
  border-color: var(--accent-ink);
}

/* Exam Timer & HUD styling */
.exam-hud-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.timer-display {
  font-size: 2.2rem;
  font-weight: 800;
  font-family: monospace;
  text-align: center;
  color: var(--text-primary);
}

.timer-display.warning {
  color: var(--color-danger);
  animation: pulse 1s infinite alternate;
}

.primary-btn {
  background: linear-gradient(135deg, var(--accent-ink) 0%, rgba(33, 37, 41, 0.8) 100%);
  border: none;
  color: var(--gray-0);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  padding: 16px;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 12px rgba(33, 37, 41, 0.25);
}

.primary-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(33, 37, 41, 0.35);
}

.secondary-btn {
  background-color: rgba(248, 249, 250, 0.03);
  border: 1px solid var(--border-glow);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  padding: 16px;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: all var(--transition-fast);
}

.secondary-btn:hover {
  background-color: var(--bg-surface-hover);
  border-color: var(--border-glow-active);
}

/* Start Screen / Intro styling for Exam */
.exam-intro-screen {
  text-align: center;
  max-width: 600px;
  margin: 40px auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.exam-intro-icon {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-lg);
  background-color: rgba(33, 37, 41, 0.1);
  border: 1px solid rgba(33, 37, 41, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 8px;
}

.exam-intro-icon svg {
  width: 40px;
  height: 40px;
  stroke: var(--accent-gold);
  stroke-width: 2;
  fill: none;
}

/* Exam Review Screens */
.results-card {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding: 48px;
}

.results-badge {
  font-size: 3.5rem;
  font-weight: 800;
  width: 140px;
  height: 140px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 4px solid var(--border-glow);
  box-shadow: var(--shadow-md);
}

.results-badge.passed {
  border-color: var(--color-success);
  color: var(--color-success);
  background-color: var(--color-success-bg);
}

.results-badge.failed {
  border-color: var(--color-danger);
  color: var(--color-danger);
  background-color: var(--color-danger-bg);
}

/* Exam Review question lists */
.review-questions-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 32px;
  width: 100%;
}

.review-item {
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glow);
  background-color: rgba(33, 37, 41, 0.3);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  text-align: left;
}

.review-item-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}

.review-item-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
}

.review-item-badge.correct {
  background-color: var(--color-success-bg);
  border: 1px solid var(--color-success-border);
  color: var(--color-success);
}

.review-item-badge.incorrect {
  background-color: var(--color-danger-bg);
  border: 1px solid var(--color-danger-border);
  color: var(--color-danger);
}

.review-item-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.review-option {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  border: 1px solid rgba(248, 249, 250, 0.03);
  background-color: rgba(33, 37, 41, 0.4);
}

.review-option.correct {
  border-color: var(--color-success);
  background-color: var(--color-success-bg);
  color: var(--text-primary);
}

.review-option.incorrect-choice {
  border-color: var(--color-danger);
  background-color: var(--color-danger-bg);
  color: var(--text-primary);
}

/* ==========================================
   SETTINGS SCREEN
   ========================================== */
.settings-section {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.settings-section-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--accent-gold);
  border-bottom: 1px solid rgba(248, 249, 250, 0.05);
  padding-bottom: 8px;
  margin-bottom: 8px;
}

.settings-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
}

.settings-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.settings-label {
  font-size: 1rem;
  font-weight: 700;
}

.settings-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Toggle Switch Control */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 52px;
  height: 28px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--gray-2);
  border: 1px solid var(--gray-4);
  transition: .4s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 3px;
  bottom: 3px;
  background-color: var(--gray-0);
  border: 1px solid var(--gray-4);
  transition: .4s;
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(33, 37, 41, 0.22);
}

:root[data-theme="dark"] .slider {
  background-color: var(--gray-6);
  border-color: var(--gray-4);
}

:root[data-theme="dark"] .slider:before {
  background-color: var(--gray-1);
  border-color: var(--gray-3);
}

input:checked + .slider {
  background-color: var(--accent-ink);
  border-color: var(--accent-ink);
}

input:focus-visible + .slider {
  outline: 2px solid var(--border-glow-active);
  outline-offset: 3px;
}

input:checked + .slider:before {
  transform: translateX(24px);
  background-color: var(--bg-app);
  border-color: transparent;
}

:root[data-theme="dark"] input:checked + .slider {
  background-color: var(--gray-2);
  border-color: var(--gray-2);
}

/* ==========================================
   NEUTRAL THEME REFINEMENTS & CATALOG
   ========================================== */
.app-container {
  background: var(--bg-app);
}

.sidebar {
  background-color: var(--bg-sidebar);
}

.logo-text {
  background: none;
  -webkit-background-clip: initial;
  -webkit-text-fill-color: currentColor;
  color: var(--text-primary);
  letter-spacing: 0;
}

.glass-card,
.action-btn-card,
.flashcard,
.review-item,
.catalog-toolbar,
.question-list-item {
  background-color: var(--bg-surface);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-sm);
}

.glass-card:hover {
  box-shadow: var(--shadow-md);
}

.stat-box,
.icon-btn,
.option-item,
.review-option,
.secondary-btn,
.state-select,
.lang-select,
.drawer-content p {
  background-color: var(--bg-control);
  border-color: var(--border-glow);
}

.nav-item.active button,
.category-tag,
.exam-nav-dot.active,
.action-btn-card:hover .action-icon-circle {
  background: var(--bg-active);
  border-color: var(--border-glow-active);
}

.nav-item.active button svg,
.action-icon-circle svg,
.exam-intro-icon svg {
  stroke: var(--accent-gold);
}

.primary-btn {
  background: var(--gray-8);
  border: 1px solid var(--gray-8);
  box-shadow: var(--shadow-sm);
}

:root[data-theme="dark"] .primary-btn {
  background: var(--gray-0);
  border-color: var(--gray-0);
  color: var(--gray-8);
}

#btn-settings-reset-all,
:root[data-theme="dark"] #btn-settings-reset-all {
  color: var(--gray-0);
}

.primary-btn:hover,
.action-btn-card:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.readiness-rating {
  background: none;
  -webkit-background-clip: initial;
  -webkit-text-fill-color: currentColor;
  color: var(--text-primary);
}

.radial-fill {
  stroke: var(--accent-ink);
}

.radial-bg {
  stroke: var(--border-glow);
}

.option-item.correct {
  background-color: var(--color-success-bg);
}

.option-item.incorrect {
  background-color: var(--color-danger-bg);
}

.catalog-shell {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.catalog-toolbar {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(320px, 0.9fr);
  gap: 16px;
  padding: 16px;
  border-radius: var(--radius-lg);
}

.catalog-search-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  background-color: var(--bg-control);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-md);
  padding: 0 14px;
}

.catalog-search-wrap svg {
  width: 18px;
  height: 18px;
  stroke: var(--text-muted);
  stroke-width: 2;
  fill: none;
  flex-shrink: 0;
}

.catalog-search-wrap input {
  width: 100%;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text-primary);
  font: 600 0.95rem var(--font-sans);
  padding: 14px 0;
}

.catalog-search-wrap input::placeholder {
  color: var(--text-muted);
}

.catalog-filters {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.catalog-summary {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 700;
}

.question-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.question-list-item {
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 18px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 18px;
  align-items: start;
}

.question-list-content {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.question-list-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.question-list-meta span {
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.72rem;
  font-weight: 800;
  padding: 3px 7px;
  text-transform: uppercase;
}

.question-list-item h3 {
  color: var(--text-primary);
  font-size: 1rem;
  line-height: 1.45;
  letter-spacing: 0;
}

.question-list-answer,
.question-list-translation {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.45;
}

.question-list-translation {
  border-left: 2px solid var(--border-glow-active);
  padding-left: 10px;
}

.question-list-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.compact-btn {
  min-height: 40px;
  padding: 0 14px;
  font-size: 0.85rem;
}

.empty-list {
  color: var(--text-secondary);
  padding: 24px;
  text-align: center;
}

.app-toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 1300;
  max-width: min(420px, calc(100vw - 32px));
  background-color: var(--bg-surface-solid);
  border: 1px solid var(--border-glow-active);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.45;
  padding: 14px 16px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.app-toast.visible {
  opacity: 1;
  transform: translateY(0);
}

.app-toast.success {
  border-color: var(--color-success-border);
}

.app-toast.warning {
  border-color: rgba(108, 117, 125, 0.45);
}

.app-toast.danger {
  border-color: var(--color-danger-border);
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1250;
  display: none;
  align-items: center;
  justify-content: center;
  background-color: rgba(var(--bg-app-rgb), 0.72);
  backdrop-filter: blur(4px);
  padding: 20px;
}

.modal-backdrop.open {
  display: flex;
}

.app-modal {
  width: min(420px, 100%);
  background-color: var(--bg-surface-solid);
  border: 1px solid var(--border-glow-active);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 22px;
}

.app-modal h2 {
  color: var(--text-primary);
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0;
}

.app-modal p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 8px;
}

.app-modal.danger .primary-btn {
  background-color: var(--color-danger);
  border-color: var(--color-danger);
  color: var(--gray-0);
}

/* ==========================================
   ANIMATIONS & KEYFRAMES
   ========================================== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  from {
    opacity: 1;
  }
  to {
    opacity: 0.7;
  }
}

/* ==========================================
   MOBILE & RESPONSIVE LAYOUT BREAKPOINTS
   ========================================== */
@media (max-width: 1024px) {
  .app-container {
    flex-direction: column;
  }

  .sidebar {
    width: 100vw;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-glow);
    padding: 16px 24px;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  .logo-container {
    margin-bottom: 0;
  }

  .logo-text {
    display: none; /* Hide title on smaller tablet width header to save space */
  }

  .nav-links {
    flex-direction: row;
    gap: 8px;
  }

  .nav-item button {
    padding: 10px 12px;
    font-size: 0.85rem;
    gap: 8px;
  }

  .app-content {
    padding: 24px;
  }

  .dashboard-grid {
    grid-template-columns: 1fr;
  }

  .practice-container, .exam-container {
    grid-template-columns: 1fr;
  }

  .practice-start-controls {
    grid-template-columns: 1fr;
  }

  .catalog-toolbar {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  /* Phone Navigation Bar: Moves to Bottom */
  .sidebar {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100vw;
    height: calc(64px + var(--sab));
    padding: 0 16px calc(0px + var(--sab)) 16px;
    border-bottom: none;
    border-top: 1px solid var(--border-glow);
    background-color: var(--bg-sidebar);
    backdrop-filter: var(--glass-blur);
    flex-direction: row;
    justify-content: space-around;
    z-index: 1000;
  }

  .logo-container {
    display: none; /* Hide Logo header on mobile bottom bar */
  }

  .nav-links {
    width: 100%;
    justify-content: space-around;
    gap: 0;
  }

  .nav-item button {
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 7px 4px;
    font-size: 0.64rem;
    gap: 4px;
    border-radius: var(--radius-sm);
    text-align: center;
    border: none;
  }

  .nav-item button span {
    line-height: 1;
  }

  .nav-item button svg {
    width: 22px;
    height: 22px;
  }

  .nav-item.active button {
    background: none;
    color: var(--accent-gold);
  }

  .app-content {
    padding: 16px;
    padding-top: calc(20px + var(--sat));
    padding-bottom: calc(88px + var(--sab)); /* Prevent bottom bar overlay */
    height: calc(100vh - (64px + var(--sab)));
  }

  body[data-active-view="practice"].practice-session-active .sidebar {
    display: none;
  }

  body[data-active-view="practice"].practice-session-active .app-content {
    height: 100vh;
    padding-bottom: calc(140px + var(--sab));
  }

  body[data-active-view="practice"].practice-session-active .practice-nav-row {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 940;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: center;
    gap: 8px;
    margin-top: 0;
    padding: 10px 20px calc(12px + var(--sab));
    background-color: rgba(var(--bg-app-rgb), 0.97);
    border-top: 1px solid var(--border-glow);
    box-shadow: 0 -10px 24px rgba(33, 37, 41, 0.12);
    backdrop-filter: var(--glass-blur);
  }

  body[data-active-view="practice"].practice-session-active .practice-nav-row .text-btn {
    min-height: 44px;
    justify-content: center;
    font-size: 0.82rem;
    line-height: 1.1;
    text-align: center;
  }

  body[data-active-view="practice"].practice-session-active #btn-practice-prev {
    order: 1;
    justify-self: stretch;
  }

  body[data-active-view="practice"].practice-session-active #btn-practice-next {
    order: 2;
    justify-self: stretch;
  }

  body[data-active-view="practice"].practice-session-active #btn-practice-change-group {
    order: 3;
    justify-self: stretch;
  }

  body[data-active-view="practice"].practice-session-active #btn-practice-finish {
    order: 4;
    justify-self: stretch;
  }

  body[data-active-view="practice"].practice-session-active .card-deck-section {
    padding-bottom: calc(116px + var(--sab));
  }

  .header-title h1 {
    font-size: 1.6rem;
  }

  .header-title p {
    font-size: 0.85rem;
  }

  .view-panel {
    gap: 20px;
  }

  .stats-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .stat-box {
    padding: 12px;
    gap: 4px;
    min-height: 82px;
  }

  .stat-box-value {
    font-size: 1.35rem;
  }

  .stat-box-label {
    font-size: 0.75rem;
    line-height: 1.25;
  }

  .dashboard-actions {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .action-btn-card {
    display: grid;
    grid-template-columns: 38px 1fr;
    column-gap: 12px;
    row-gap: 4px;
    align-items: center;
    padding: 16px;
  }

  .action-icon-circle {
    grid-row: 1 / span 2;
    width: 38px;
    height: 38px;
    margin-bottom: 0;
  }

  .action-icon-circle svg {
    width: 20px;
    height: 20px;
  }

  .action-btn-card h3 {
    font-size: 1rem;
  }

  .action-btn-card p {
    font-size: 0.8rem;
  }

  .flashcard {
    padding: 20px;
    min-height: auto;
    justify-content: flex-start;
    gap: 18px;
  }

  .question-text-box {
    gap: 12px;
    margin-bottom: 0;
  }

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

  .options-list {
    gap: 10px;
    margin-top: 0;
  }

  .option-item {
    padding: 12px 14px;
    font-size: 0.9rem;
  }

  .explanation-drawer {
    width: 100vw;
    right: -100vw;
    padding: calc(64px + var(--sat)) 20px calc(24px + var(--sab));
  }

  .drawer-header {
    align-items: flex-start;
    gap: 16px;
  }

  .drawer-header h2 {
    font-size: 1.25rem;
    line-height: 1.15;
  }

  .exam-nav-grid {
    grid-template-columns: repeat(6, 1fr);
  }

  .review-item-options {
    grid-template-columns: 1fr;
  }

  .catalog-filters,
  .question-list-item {
    grid-template-columns: 1fr;
  }

  .question-list-actions {
    justify-content: space-between;
  }

  .app-toast {
    right: 16px;
    bottom: calc(84px + var(--sab));
  }

  .modal-actions {
    flex-direction: column-reverse;
  }

  #view-settings .settings-section {
    gap: 14px;
    padding: 20px;
  }

  #view-settings .settings-section-title {
    font-size: 1.1rem;
    margin-bottom: 0;
  }

  #view-settings .settings-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    align-items: stretch;
    padding: 12px 0;
  }

  #view-settings .settings-info {
    min-width: 0;
  }

  #view-settings .settings-label {
    font-size: 0.98rem;
    line-height: 1.2;
  }

  #view-settings .settings-desc {
    font-size: 0.82rem;
    line-height: 1.35;
  }

  #view-settings .settings-row .state-select-wrapper {
    width: 100% !important;
  }

  #view-settings .settings-row .state-select {
    min-height: 44px;
    padding: 10px 38px 10px 12px;
  }

  #view-settings .settings-row .toggle-switch {
    justify-self: start;
  }

  header.view-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 16px;
  }

  .lang-selector-overlay {
    width: 100%;
    flex-wrap: wrap;
  }

  .practice-active-group,
  #practice-container > .practice-sidebar-card {
    display: none;
  }

  #practice-container {
    gap: 14px;
  }

  #view-practice .practice-controls-header {
    padding: 0;
  }

  #view-practice .category-tag {
    max-width: calc(100% - 100px);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  #view-practice .card-actions-row {
    gap: 8px;
  }

  .lang-selector-overlay .lang-select {
    flex: 1 1 150px;
  }
}