/* style.css - Design System and Theme Rules */

/* CSS Variables & Themes */
:root {
  /* Fonts */
  --font-main: 'Outfit', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Shared Base Tokens (Dark Theme Defaults) */
  --bg-primary: linear-gradient(135deg, #0d0a1b 0%, #130f26 40%, #06040e 100%);
  --bg-card: rgba(26, 21, 46, 0.5);
  --bg-card-hover: rgba(33, 27, 58, 0.65);
  --border-color: rgba(138, 92, 246, 0.15);
  --border-focus: rgba(0, 242, 254, 0.6);
  --text-primary: #f1efff;
  --text-secondary: #9c99bf;
  --text-muted: #6b688d;
  
  /* Brand Colors */
  --accent-cyan: #00f2fe;
  --accent-teal: #4facfe;
  --accent-purple: #8b5cf6;
  --accent-pink: #ec4899;
  --accent-gold: #f5d061;
  --accent-success: #10b981;
  --accent-error: #ef4444;
  
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(0, 242, 254, 0.15);
}

[data-theme="light"] {
  /* Light Theme Tokens */
  --bg-primary: linear-gradient(135deg, #f3f0ff 0%, #edf2f7 50%, #e0e7ff 100%);
  --bg-card: rgba(255, 255, 255, 0.7);
  --bg-card-hover: rgba(255, 255, 255, 0.85);
  --border-color: rgba(99, 102, 241, 0.18);
  --border-focus: rgba(99, 102, 241, 0.6);
  --text-primary: #1e1b4b;
  --text-secondary: #4f46e5;
  --text-muted: #8281a8;
  
  /* Brand Colors */
  --accent-cyan: #0ea5e9;
  --accent-teal: #3b82f6;
  --accent-purple: #6d28d9;
  --accent-pink: #db2777;
  --accent-gold: #b45309;
  --accent-success: #059669;
  --accent-error: #dc2626;
  
  --shadow-sm: 0 2px 4px rgba(99, 102, 241, 0.05);
  --shadow-md: 0 8px 16px rgba(99, 102, 241, 0.1);
  --shadow-lg: 0 16px 24px rgba(99, 102, 241, 0.15);
  --shadow-glow: 0 0 15px rgba(99, 102, 241, 0.12);
}

/* Reset and Core Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  color: var(--text-primary);
  background: var(--bg-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  overflow-x: hidden;
  position: relative;
  line-height: 1.6;
}

/* Decorative Background Glows */
.bg-glow {
  position: absolute;
  width: 40vw;
  height: 40vw;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.15;
  z-index: -1;
  pointer-events: none;
}
.bg-glow-1 {
  background: var(--accent-purple);
  top: -10vw;
  left: -10vw;
  animation: float-glow 15s infinite alternate ease-in-out;
}
.bg-glow-2 {
  background: var(--accent-cyan);
  bottom: -10vw;
  right: -10vw;
  animation: float-glow 20s infinite alternate-reverse ease-in-out;
}

@keyframes float-glow {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(8%, 5%) scale(1.1); }
}

/* Layout Containers */
.app-container {
  width: 100%;
  max-width: 1200px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
.main-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-icon {
  background: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-teal) 100%);
  color: white;
  width: 50px;
  height: 50px;
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.75rem;
  box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
  line-height: 1;
}
.logo-icon svg {
  margin: 1px 0;
  opacity: 0.9;
}

.logo-area h1 {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.tagline {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Navigation Tabs */
.tab-navigation {
  display: flex;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 0.35rem;
  border-radius: 12px;
  gap: 0.25rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
}
.tab-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.8rem 1rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}
.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.03);
}
.tab-btn.active {
  background: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-teal) 100%);
  color: white;
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.2);
}

/* General Card Design (Glassmorphic) */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}
.card:hover {
  border-color: rgba(139, 92, 246, 0.25);
  box-shadow: var(--shadow-lg);
}
.card-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}
.card-header h2 {
  font-size: 1.3rem;
  font-weight: 700;
}
.card-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
}
.card-header p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}
.card-body {
  padding: 1.5rem;
}

/* Tab Panels */
.tab-panel {
  display: none;
}
.tab-panel.active {
  display: block;
  animation: fadeIn var(--transition-normal);
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}

/* GRID LAYOUTS */
.workspace-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}
@media (max-width: 900px) {
  .workspace-grid {
    grid-template-columns: 1fr;
  }
}

/* Form Controls */
.form-group {
  margin-bottom: 1.25rem;
}
.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}
.form-control {
  width: 100%;
  padding: 0.8rem 1rem;
  font-size: 1rem;
  background: rgba(0, 0, 0, 0.15);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-primary);
  font-family: var(--font-main);
  transition: all var(--transition-fast);
}
.form-control:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: var(--shadow-glow);
  background: rgba(0, 0, 0, 0.25);
}
select.form-control {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%239c99bf' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

/* Selectors Row */
.bases-selector-row {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}
.bases-selector-row .form-group {
  flex: 1;
}
.swap-btn {
  margin-top: 1.8rem;
  width: 42px;
  height: 42px;
  min-width: 42px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Inline Base Container */
.custom-base-container {
  display: none;
  margin-top: 0.5rem;
}
.custom-base-container.active {
  display: block;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.btn:active {
  transform: scale(0.98);
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-teal) 100%);
  color: white;
  box-shadow: 0 4px 15px rgba(139, 92, 246, 0.35);
}
.btn-primary:hover {
  filter: brightness(1.15);
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.45);
}
.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}
.btn-copy {
  padding: 0.5rem 0.8rem;
  font-size: 0.8rem;
}

.icon-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}
.icon-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Input text wrapper with action button (clear) */
.input-with-action {
  position: relative;
  display: flex;
  align-items: center;
}
.input-with-action .form-control {
  padding-right: 2.5rem;
}
.clear-btn {
  position: absolute;
  right: 0.8rem;
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition-fast);
}
.clear-btn:hover {
  color: var(--text-primary);
}

.font-mono {
  font-family: var(--font-mono);
}
.font-large {
  font-size: 1.3rem;
  letter-spacing: 0.5px;
}

/* Input validation error */
.input-error-msg {
  font-size: 0.8rem;
  color: var(--accent-error);
  margin-top: 0.4rem;
  min-height: 1.2rem;
}

/* KEYBOARD HELPER */
.keyboard-helper {
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
  margin-top: 0.5rem;
}
.keyboard-helper-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.keyboard-keys {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}
.key-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}
.key-btn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
  border-color: var(--text-secondary);
}
.key-btn:disabled {
  opacity: 0.15;
  cursor: not-allowed;
}

/* RESULT CARD */
.result-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.result-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100%;
  min-height: 180px;
}
.result-display-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 1rem;
}
.result-number-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.result-output-container {
  display: flex;
  align-items: baseline;
  justify-content: center;
  background: rgba(0, 0, 0, 0.2);
  padding: 1rem 2rem;
  border-radius: 12px;
  border: 1px dashed var(--border-color);
  width: 100%;
  max-width: 320px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.result-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-shadow: 0 0 10px rgba(0, 242, 254, 0.3);
  word-break: break-all;
}
.base-sub {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-left: 0.25rem;
}

/* EXPLANATIONS CONTAINER */
.explanation-card {
  margin-top: 1.5rem;
}
.explanation-header-main {
  display: flex;
  flex-direction: column;
}
.header-title-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.accent-icon {
  color: var(--accent-cyan);
}
.hidden {
  display: none !important;
}

/* Educational Explanation Renders */
.explanation-section {
  margin-bottom: 2rem;
}
.explanation-section:last-child {
  margin-bottom: 0;
}
.explanation-section h3 {
  font-size: 1.15rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
  border-left: 3px solid var(--accent-purple);
  padding-left: 0.75rem;
}

.math-formula {
  background: rgba(0, 0, 0, 0.15);
  padding: 1rem;
  border-radius: 10px;
  margin-bottom: 1.25rem;
  overflow-x: auto;
  font-size: 1rem;
}

/* Sum positional visualizer */
.positional-sum-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 1rem;
}

.digit-positions-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 0.75rem;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 12px;
  justify-content: center;
}

.digit-pos-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 50px;
  padding: 0.5rem 0;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}
.digit-pos-box .digit {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
}
.digit-pos-box .position {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-top: 0.25rem;
}

/* Detailed terms checklist */
.math-terms-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.math-term-item {
  display: flex;
  align-items: center;
  padding: 0.6rem 0.8rem;
  background: rgba(255, 255, 255, 0.02);
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  border-left: 3px solid transparent;
}
.math-term-item.integer-term {
  border-left-color: var(--accent-purple);
}
.math-term-item.fractional-term {
  border-left-color: var(--accent-pink);
}
.term-calc {
  flex: 1;
}
.term-arrow {
  color: var(--text-muted);
  margin: 0 0.75rem;
}
.term-result {
  font-weight: 600;
  color: var(--accent-cyan);
}

.final-sum-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}
.final-sum-title {
  font-weight: 700;
  font-size: 1.05rem;
}
.final-sum-calc {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--accent-gold);
  font-weight: 700;
}

/* DIVISION TABLES */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  margin-top: 1rem;
}
.edu-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  text-align: left;
}
.edu-table th {
  background: rgba(0, 0, 0, 0.3);
  padding: 0.8rem 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
}
.edu-table td {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.01);
}
.edu-table tr:last-child td {
  border-bottom: none;
}
.remainder-highlight {
  font-weight: 700;
  color: var(--accent-success);
}
.fractional-multiply-highlight {
  font-weight: 700;
  color: var(--accent-pink);
}

/* POWER DIRECT GROUPING GRAPHICS */
.grouping-visualizer {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 1rem;
  padding: 1.25rem;
  background: rgba(0, 0, 0, 0.15);
  border-radius: 12px;
  border: 1px dashed var(--border-color);
  overflow-x: auto;
}
.grouping-row {
  display: flex;
  gap: 1rem;
  justify-content: center;
  align-items: center;
  min-width: max-content;
}
.group-mapping-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.75rem;
  width: 90px;
}
.group-source {
  font-size: 1.15rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-primary);
  letter-spacing: 2px;
}
.group-arrow {
  margin: 0.4rem 0;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
}
.group-arrow svg {
  transform: rotate(90deg);
}
.group-target {
  font-size: 1.3rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  text-shadow: 0 0 5px rgba(0, 242, 254, 0.2);
}
.group-value-calc {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.visualizer-note {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-style: italic;
  text-align: center;
}

/* Generic Multi-Step Explanations */
.multi-step-timeline {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  position: relative;
}
.multi-step-timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--border-color);
  z-index: 0;
}
.timeline-item {
  display: flex;
  gap: 1.25rem;
  position: relative;
  z-index: 1;
}
.timeline-dot {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-teal) 100%);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  box-shadow: 0 4px 10px rgba(139, 92, 246, 0.3);
  font-size: 1.1rem;
  flex-shrink: 0;
}
.timeline-content {
  flex: 1;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1rem;
}
.timeline-title {
  font-weight: 700;
  margin-bottom: 0.75rem;
  font-size: 1.05rem;
  color: var(--accent-cyan);
}

/* QUIZ TAB STYLING */
.quiz-layout-grid {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 1.5rem;
}
@media (max-width: 900px) {
  .quiz-layout-grid {
    grid-template-columns: 1fr;
  }
}

.score-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}
.score-box {
  background: rgba(0, 0, 0, 0.15);
  border-radius: 10px;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  border: 1px solid var(--border-color);
}
.score-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  color: var(--text-secondary);
  font-weight: 600;
  letter-spacing: 0.5px;
}
.score-val {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  margin-top: 0.25rem;
}

.quiz-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.w-full {
  width: 100%;
}

.question-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255, 255, 255, 0.02);
  padding: 1rem 1.5rem;
}
.question-badge {
  background: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-pink) 100%);
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: 20px;
  text-transform: uppercase;
}
.quiz-timer {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--accent-gold);
}

.question-text {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: rgba(0, 0, 0, 0.1);
  border-radius: 10px;
  border-left: 4px solid var(--accent-cyan);
}
.question-text sub {
  font-size: 0.75rem;
  color: var(--text-secondary);
  bottom: -0.25em;
  margin-left: 2px;
}

.quiz-actions-row {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}
.quiz-actions-row button {
  flex: 1;
}

/* QUIZ FEEDBACK BOX */
.quiz-feedback-box {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  border-radius: 10px;
  margin-top: 1.25rem;
  animation: feedbackSlideIn var(--transition-fast) ease;
}
@keyframes feedbackSlideIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.quiz-feedback-box.correct {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid var(--accent-success);
  color: var(--accent-success);
}
.quiz-feedback-box.correct h4 {
  color: var(--accent-success);
}

.quiz-feedback-box.incorrect {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--accent-error);
  color: var(--accent-error);
}
.quiz-feedback-box.incorrect h4 {
  color: var(--accent-error);
}

.feedback-text-content h4 {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.15rem;
}
.feedback-text-content p {
  font-size: 0.85rem;
  opacity: 0.9;
}

.feedback-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.correct .feedback-icon {
  background: var(--accent-success);
  color: white;
}
.incorrect .feedback-icon {
  background: var(--accent-error);
  color: white;
}

.quiz-card-footer {
  background: rgba(0, 0, 0, 0.1);
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: flex-end;
}
.btn-small {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}

/* SHAKE ANIMATION FOR ERROR */
.shake {
  animation: shakeAnimation 0.5s ease;
}
@keyframes shakeAnimation {
  0%, 100% { transform: translateX(0); }
  15%, 45%, 75% { transform: translateX(-6px); }
  30%, 60%, 90% { transform: translateX(6px); }
}

/* CELEBRATION BOUNCE */
.bounce {
  animation: bounceAnimation 0.6s ease;
}
@keyframes bounceAnimation {
  0%, 100% { transform: scale(1); }
  30% { transform: scale(1.08); }
  50% { transform: scale(0.96); }
  75% { transform: scale(1.02); }
}

/* Footers */
.main-footer {
  margin-top: auto;
  padding: 2rem 0 1rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
}

/* Theme switch animations/elements */
body, .card, .form-control, .btn, .icon-btn, .tab-navigation, .tab-btn, .logo-area h1, .tagline {
  transition: background 0.3s ease, border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}

/* Icon Toggles for Theme Toggle */
.sun-icon {
  display: block;
}
.moon-icon {
  display: none;
}
[data-theme="light"] .sun-icon {
  display: none;
}
[data-theme="light"] .moon-icon {
  display: block;
}

/* Sub-Tabs Switcher for conversion methods */
.sub-tabs-container {
  display: flex;
  background: rgba(0, 0, 0, 0.15);
  border: 1px solid var(--border-color);
  padding: 0.25rem;
  border-radius: 10px;
  gap: 0.25rem;
  margin-top: 1rem;
  margin-bottom: 1.25rem;
  max-width: 500px;
}
.sub-tab-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.5rem 0.75rem;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  transition: all var(--transition-fast);
  font-family: var(--font-main);
}
.sub-tab-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.02);
}
.sub-tab-btn.active {
  background: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-teal) 100%);
  color: white;
  box-shadow: 0 2px 8px rgba(139, 92, 246, 0.2);
}

.method-panel {
  display: block;
}
.method-panel.hidden {
  display: none !important;
}

[data-theme="light"] .sub-tabs-container {
  background: rgba(0, 0, 0, 0.05);
}
[data-theme="light"] .sub-tab-btn:hover {
  background: rgba(0, 0, 0, 0.02);
}

/* Custom Switch Toggle for Quiz Settings */
.switch-group {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
}

.switch-label {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
}

.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
  min-width: 44px;
}

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

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
  transition: var(--transition-fast);
  border-radius: 24px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: var(--text-secondary);
  transition: var(--transition-fast);
  border-radius: 50%;
}

.switch input:checked + .slider {
  background: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-teal) 100%);
  border-color: transparent;
  box-shadow: 0 0 10px rgba(0, 242, 254, 0.3);
}

.switch input:checked + .slider:before {
  transform: translateX(20px);
  background-color: white;
}

.switch input:focus + .slider {
  border-color: var(--border-focus);
}

[data-theme="light"] .slider {
  background-color: rgba(0, 0, 0, 0.05);
}

/* Score rules info box in Quiz */
.score-rules-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.02);
  border-top: 1px solid var(--border-color);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.score-rules-info svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
}