/* Latin Grammar Practice Platform - Styles */

/* CSS Custom Properties */
:root {
  /* Colors - calm palette */
  --color-primary: #4a6fa5;
  --color-primary-dark: #3d5d8a;
  --color-primary-light: #6b8fc5;

  --color-correct: #4caf50;
  --color-correct-bg: #e8f5e9;
  --color-incorrect: #e67e22;
  --color-incorrect-bg: #fef3e2;
  --color-typo: #2196f3;
  --color-typo-bg: #e3f2fd;

  --color-bg: #f5f7fa;
  --color-surface: #ffffff;
  --color-surface-elevated: #ffffff;
  --color-text: #2c3e50;
  --color-text-secondary: #5d6d7e;
  --color-text-muted: #95a5a6;
  --color-border: #dfe6e9;
  --color-border-light: #ecf0f1;

  --color-danger: #c0392b;
  --color-warning: #f39c12;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-family-latin: 'Georgia', 'Times New Roman', serif;

  --font-size-base: 16px;
  --font-size-sm: 14px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 32px;
  --font-size-latin: 22px;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* Reset and Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

/* App Container */
#app {
  max-width: 800px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.app-header h1 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-primary);
}

.header-actions {
  display: flex;
  gap: var(--spacing-sm);
}

.icon-btn {
  background: none;
  border: none;
  padding: var(--spacing-sm);
  cursor: pointer;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
}

.icon-btn:hover {
  background: var(--color-border-light);
  color: var(--color-primary);
}

.icon-btn:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Main Content */
#main-content {
  flex: 1;
  padding: var(--spacing-md);
}

/* Screen Management */
.screen {
  display: none;
}

.screen.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

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

/* Utility Classes */
.hidden {
  display: none !important;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: var(--transition-fast);
  text-decoration: none;
  gap: var(--spacing-sm);
}

.btn:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
}

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

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

.btn-secondary:hover {
  background: var(--color-border-light);
}

.btn-link {
  background: none;
  color: var(--color-primary);
  padding: var(--spacing-xs) var(--spacing-sm);
}

.btn-link:hover {
  text-decoration: underline;
}

.btn-danger {
  background: var(--color-danger);
  color: white;
}

.btn-danger:hover {
  background: #a93226;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.button-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
}

/* Cards */
.welcome-card,
.results-card,
.completion-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  text-align: center;
}

.welcome-card h2,
.results-card h2,
.completion-card h2 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
}

.subtitle {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

/* Progress Summary */
.progress-summary {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
  margin: var(--spacing-lg) 0;
}

.stat {
  text-align: center;
}

.stat-value {
  display: block;
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-primary);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.info-text {
  color: var(--color-text-secondary);
  margin: var(--spacing-md) 0;
}

.secondary-actions {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border-light);
}

/* Phase Header */
.phase-header {
  margin-bottom: var(--spacing-lg);
}

.phase-header h2 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
}

/* Progress Indicator */
.progress-indicator {
  margin-bottom: var(--spacing-md);
}

.progress-bar {
  height: 8px;
  background: var(--color-border-light);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
  width: 0%;
}

.progress-text {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* Timer Display */
.timer-display {
  margin-top: var(--spacing-md);
}

.timer-display.compact {
  margin-top: var(--spacing-sm);
}

.timer-bar {
  height: 6px;
  background: var(--color-border-light);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.timer-fill {
  height: 100%;
  background: var(--color-primary-light);
  border-radius: var(--radius-full);
  transition: width 1s linear;
  width: 100%;
}

.timer-fill.warning {
  background: var(--color-warning);
}

.timer-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-xs);
}

/* Question Area */
.question-area {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  min-height: 300px;
}

/* Question Header */
.question-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.question-prompt {
  font-size: var(--font-size-lg);
  flex: 1;
}

/* Report Button */
.report-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  white-space: nowrap;
  flex-shrink: 0;
}

.report-btn:hover {
  color: var(--color-warning);
  background: rgba(243, 156, 18, 0.1);
}

.report-btn svg {
  flex-shrink: 0;
}

.report-btn span {
  display: none;
}

@media (min-width: 600px) {
  .report-btn span {
    display: inline;
  }
}

.latin-text {
  font-family: var(--font-family-latin);
  font-size: var(--font-size-latin);
  font-style: italic;
  color: var(--color-primary-dark);
}

/* Multiple Choice */
.options-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.option-btn {
  display: block;
  width: 100%;
  padding: var(--spacing-md);
  text-align: left;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  cursor: pointer;
  transition: var(--transition-fast);
}

.option-btn:hover:not(:disabled) {
  border-color: var(--color-primary);
  background: var(--color-bg);
}

.option-btn.selected {
  border-color: var(--color-primary);
  background: rgba(74, 111, 165, 0.1);
}

.option-btn.correct {
  border-color: var(--color-correct);
  background: var(--color-correct-bg);
}

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

.option-btn.typo {
  border-color: var(--color-typo);
  background: var(--color-typo-bg);
}

.option-btn:disabled {
  cursor: default;
}

/* Text Input */
.answer-input-wrapper {
  margin-bottom: var(--spacing-md);
}

.answer-input {
  width: 100%;
  padding: var(--spacing-md);
  font-size: var(--font-size-lg);
  font-family: var(--font-family-latin);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
}

.answer-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.answer-input.correct {
  border-color: var(--color-correct);
  background: var(--color-correct-bg);
}

.answer-input.incorrect {
  border-color: var(--color-incorrect);
  background: var(--color-incorrect-bg);
}

.answer-input.typo {
  border-color: var(--color-typo);
  background: var(--color-typo-bg);
}

/* Feedback */
.feedback {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin-top: var(--spacing-md);
  animation: fadeIn 0.2s ease;
}

.feedback.correct {
  background: var(--color-correct-bg);
  border-left: 4px solid var(--color-correct);
}

.feedback.incorrect {
  background: var(--color-incorrect-bg);
  border-left: 4px solid var(--color-incorrect);
}

.feedback.typo {
  background: var(--color-typo-bg);
  border-left: 4px solid var(--color-typo);
}

.feedback-title {
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.feedback.correct .feedback-title {
  color: var(--color-correct);
}

.feedback.incorrect .feedback-title {
  color: var(--color-incorrect);
}

.feedback.typo .feedback-title {
  color: var(--color-typo);
}

.feedback-message {
  margin-bottom: var(--spacing-xs);
}

.feedback-rationale {
  font-size: var(--font-size-sm);
  font-style: italic;
  margin-top: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  color: var(--color-text-secondary);
}

.feedback-explanation {
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: rgba(0, 0, 0, 0.05);
  border-radius: var(--radius-sm);
}

.feedback-explanation strong {
  color: var(--color-primary);
}

/* Drag and Drop */
.drag-container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--color-bg);
  border-radius: var(--radius-md);
  min-height: 60px;
  margin-bottom: var(--spacing-md);
}

.drag-item {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: grab;
  user-select: none;
  transition: var(--transition-fast);
}

.drag-item:hover {
  border-color: var(--color-primary);
}

.drag-item.dragging {
  opacity: 0.5;
}

.drag-item.selected {
  border-color: var(--color-primary);
  background: rgba(74, 111, 165, 0.1);
}

.drop-zone {
  padding: var(--spacing-md);
  background: var(--color-bg);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  min-height: 60px;
  transition: var(--transition-fast);
}

.drop-zone.active {
  border-color: var(--color-primary);
  background: rgba(74, 111, 165, 0.05);
}

.drop-zone.has-item {
  border-style: solid;
}

/* Matching */
.matching-grid {
  display: grid;
  gap: var(--spacing-md);
}

.match-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--spacing-md);
}

.match-item {
  padding: var(--spacing-md);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  text-align: center;
}

.match-arrow {
  color: var(--color-text-muted);
}

/* Lesson Area */
.lesson-area {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
}

.lesson-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.lesson-badge {
  font-size: var(--font-size-sm);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-primary-light);
  color: white;
  border-radius: var(--radius-full);
}

.lesson-controls {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
}

/* Lesson Content Sections */
.lesson-section {
  margin-bottom: var(--spacing-xl);
}

.lesson-section h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

.explanation-text {
  line-height: 1.8;
}

.paradigm-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-md) 0;
  font-family: var(--font-family-latin);
}

.paradigm-table th,
.paradigm-table td {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  text-align: center;
}

.paradigm-table th {
  background: var(--color-primary);
  color: white;
  font-family: var(--font-family);
  font-weight: 500;
}

.paradigm-table td {
  font-size: var(--font-size-lg);
}

.mnemonic-box {
  padding: var(--spacing-md);
  background: var(--color-bg);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-sm);
  font-style: italic;
}

/* Tiered Explanations */
.help-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-md);
  font-size: var(--font-size-sm);
}

.help-toggle-btn:disabled {
  color: var(--color-text-muted);
  cursor: not-allowed;
}

.help-toggle-btn:disabled:hover {
  text-decoration: none;
}

.full-explanation-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  margin-top: var(--spacing-md);
}

.full-explanation-panel.expanded {
  max-height: 2000px;
  padding: var(--spacing-lg);
  border: 1px solid var(--color-border);
}

.full-explanation-content h4 {
  font-size: var(--font-size-lg);
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.full-explanation-content h5 {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin: var(--spacing-lg) 0 var(--spacing-sm);
}

.full-explanation-content .explanation-text {
  line-height: 1.8;
}

.full-explanation-content .explanation-text p {
  margin-bottom: var(--spacing-md);
}

.paradigm-section {
  margin: var(--spacing-lg) 0;
}

.external-links-section {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.external-links {
  list-style: none;
  padding: 0;
}

.external-links li {
  margin-bottom: var(--spacing-sm);
}

.external-links a {
  color: var(--color-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.external-links a:hover {
  text-decoration: underline;
}

.external-links a::after {
  content: '';
  display: inline-block;
  width: 12px;
  height: 12px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%234a6fa5' stroke-width='2'%3E%3Cpath d='M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6'/%3E%3Cpolyline points='15 3 21 3 21 9'/%3E%3Cline x1='10' y1='14' x2='21' y2='3'/%3E%3C/svg%3E");
  background-size: contain;
}

/* Quiz Info */
.quiz-info {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.quiz-info .progress-indicator {
  flex: 1;
  margin-bottom: 0;
}

.quiz-info .timer-display {
  width: 100px;
  margin-top: 0;
}

/* Completion Screen */
.score-display {
  margin: var(--spacing-xl) 0;
}

.big-score {
  font-size: 64px;
  font-weight: 700;
  color: var(--color-primary);
}

.big-score .percent {
  font-size: var(--font-size-2xl);
}

.comparison-text {
  color: var(--color-text-secondary);
  margin-top: var(--spacing-sm);
}

.trend-display,
.mastery-display {
  margin: var(--spacing-xl) 0;
  padding: var(--spacing-lg);
  background: var(--color-bg);
  border-radius: var(--radius-md);
}

.trend-display h3,
.mastery-display h3 {
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}

/* Sparkline */
.sparkline {
  height: 60px;
  display: flex;
  align-items: flex-end;
  gap: 2px;
}

.sparkline-bar {
  flex: 1;
  background: var(--color-primary);
  border-radius: 2px 2px 0 0;
  min-height: 4px;
  transition: height 0.3s ease;
}

.sparkline-bar.current {
  background: var(--color-primary-dark);
}

/* Mastery Bar */
.mastery-bar-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.mastery-bar {
  flex: 1;
  height: 24px;
  background: var(--color-border-light);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.mastery-bar::after {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  background: var(--color-correct);
  border-radius: var(--radius-full);
  transition: width 0.5s ease;
  width: var(--mastery-percent, 0%);
}

.mastery-text {
  font-weight: 600;
  white-space: nowrap;
}

/* Feedback Sections */
.feedback-section {
  margin: var(--spacing-lg) 0;
  text-align: left;
}

.feedback-section h3 {
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

.feedback-list {
  list-style: none;
}

.feedback-list li {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-xs);
}

.feedback-list.strengths li {
  background: var(--color-correct-bg);
  border-left: 3px solid var(--color-correct);
}

.feedback-list.growth li {
  background: var(--color-incorrect-bg);
  border-left: 3px solid var(--color-incorrect);
}

/* Growth topic with resource links */
.growth-topic-name {
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
}

.growth-topic-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
}

.growth-topic-links a {
  color: var(--color-primary);
  text-decoration: none;
}

.growth-topic-links a:hover {
  text-decoration: underline;
}

.growth-topic-links a::before {
  content: '\2192 ';
}

/* Milestones */
.milestones-section {
  margin: var(--spacing-lg) 0;
  padding: var(--spacing-md);
  background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
  border-radius: var(--radius-md);
}

.milestones-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  justify-content: center;
}

.milestone-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background: white;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 500;
  box-shadow: var(--shadow-sm);
}

.typo-summary {
  padding: var(--spacing-md);
  background: var(--color-typo-bg);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
}

.next-session-info {
  margin: var(--spacing-xl) 0;
  color: var(--color-text-secondary);
}

.completion-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  justify-content: center;
}

/* Modal Styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--spacing-md);
}

.modal {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  animation: modalIn 0.2s ease;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.modal-header h3 {
  font-size: var(--font-size-lg);
}

.modal-close {
  background: none;
  border: none;
  font-size: var(--font-size-2xl);
  cursor: pointer;
  color: var(--color-text-secondary);
  line-height: 1;
}

.modal-close:hover {
  color: var(--color-text);
}

.modal-content {
  padding: var(--spacing-lg);
}

.modal-content p {
  margin-bottom: var(--spacing-md);
}

.modal-content p:last-child {
  margin-bottom: 0;
}

/* Tooltip Modal */
.tooltip-modal {
  max-width: 300px;
  pointer-events: none;
}

.tooltip-modal .modal-content {
  padding: var(--spacing-sm) var(--spacing-md);
}

/* Settings */
.setting-item {
  margin-bottom: var(--spacing-lg);
}

.setting-item label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
}

.setting-item input[type="text"] {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
}

.setting-item h4 {
  margin-bottom: var(--spacing-sm);
}

.setting-item .btn {
  margin-right: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

/* Upload Modal */
.upload-options {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.upload-divider {
  text-align: center;
  color: var(--color-text-muted);
}

.upload-option textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: monospace;
  font-size: var(--font-size-sm);
  resize: vertical;
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: 1100;
}

.toast {
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-text);
  color: white;
  border-radius: var(--radius-md);
  margin-top: var(--spacing-sm);
  animation: toastIn 0.3s ease;
  box-shadow: var(--shadow-lg);
}

.toast.success {
  background: var(--color-correct);
}

.toast.error {
  background: var(--color-danger);
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Breakdown List */
.breakdown-list {
  text-align: left;
  margin: var(--spacing-lg) 0;
}

.breakdown-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid var(--color-border-light);
}

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

.breakdown-score {
  font-weight: 600;
}

.breakdown-score.high {
  color: var(--color-correct);
}

.breakdown-score.low {
  color: var(--color-incorrect);
}

/* Summary Text */
.summary-text {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin: var(--spacing-md) 0;
}

/* Terminology Tooltip */
.term {
  border-bottom: 1px dotted var(--color-primary);
  cursor: help;
}

/* Context Sentence */
.context-sentence {
  padding: var(--spacing-md);
  background: var(--color-bg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  font-style: italic;
}

.context-sentence .highlight {
  background: rgba(74, 111, 165, 0.2);
  padding: 0 var(--spacing-xs);
  border-radius: var(--radius-sm);
}

/* Mobile Tap Alternatives */
.tap-instruction {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-align: center;
  margin-bottom: var(--spacing-sm);
}

.sort-controls {
  display: flex;
  gap: var(--spacing-xs);
}

.sort-btn {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: var(--font-size-sm);
}

.sort-btn:hover {
  background: var(--color-border-light);
}

/* Responsive */
@media (max-width: 600px) {
  :root {
    --spacing-lg: 16px;
    --spacing-xl: 24px;
  }

  .app-header h1 {
    font-size: var(--font-size-base);
  }

  .welcome-card,
  .results-card,
  .completion-card {
    padding: var(--spacing-lg);
  }

  .progress-summary {
    gap: var(--spacing-lg);
  }

  .stat-value {
    font-size: var(--font-size-2xl);
  }

  .big-score {
    font-size: 48px;
  }

  .completion-actions {
    flex-direction: column;
  }

  .completion-actions .btn {
    width: 100%;
  }

  .quiz-info {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .quiz-info .timer-display {
    width: 100%;
  }

  .match-row {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }

  .match-arrow {
    transform: rotate(90deg);
  }

  .lesson-info {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Focus styles for accessibility */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Performance Mode */
.performance-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.performance-header h2 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.performance-stats {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.perf-stat {
  text-align: center;
}

.perf-value {
  display: block;
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-primary);
}

.perf-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.performance-flash {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: var(--spacing-lg) var(--spacing-xl);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-2xl);
  font-weight: 700;
  z-index: 200;
  animation: flashPop 0.4s ease-out forwards;
  pointer-events: none;
}

.performance-flash.correct {
  background: var(--color-correct);
  color: white;
}

.performance-flash.incorrect {
  background: var(--color-incorrect);
  color: white;
}

@keyframes flashPop {
  0% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(1.3);
  }
}

.performance-best {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-md);
  background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
  border-radius: var(--radius-md);
  text-align: center;
}

.performance-best h4 {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.best-stats {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  font-size: var(--font-size-sm);
}

.best-stat {
  text-align: center;
}

.best-stat strong {
  display: block;
  font-size: var(--font-size-lg);
}

/* Mastery Matrix Panel */
.mastery-matrix-panel {
  position: fixed;
  right: 0;
  top: 100px;
  width: 280px;
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
  border-top-left-radius: var(--radius-lg);
  border-bottom-left-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 90;
  transition: transform var(--transition-normal);
}

.mastery-matrix-panel.collapsed {
  transform: translateX(calc(100% - 40px));
}

.mastery-matrix-panel.matrix-hidden {
  display: none;
}

.matrix-toggle {
  position: absolute;
  left: -1px;
  top: 0;
  width: 40px;
  height: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-right: none;
  border-top-left-radius: var(--radius-md);
  border-bottom-left-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  color: var(--color-text-secondary);
  transition: var(--transition-fast);
}

.matrix-toggle:hover {
  background: var(--color-bg);
  color: var(--color-primary);
}

.matrix-toggle span {
  writing-mode: vertical-lr;
  text-orientation: mixed;
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.matrix-content {
  padding: var(--spacing-md);
  max-height: calc(100vh - 200px);
  overflow-y: auto;
}

.matrix-title {
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}

.mastery-matrix-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-xs);
}

.matrix-cell {
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 11px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition-fast);
  border: 2px solid transparent;
  line-height: 1.3;
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.matrix-cell:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-sm);
}

.matrix-cell.current {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(74, 111, 165, 0.3);
}

.matrix-cell.mastered {
  background: var(--color-correct-bg);
  color: #2e7d32;
}

.matrix-cell.learning {
  background: #fff3e0;
  color: #e65100;
}

.matrix-cell.not-started {
  background: var(--color-bg);
  color: var(--color-text-secondary);
}

.matrix-cell.coming-soon {
  background: var(--color-border-light);
  color: var(--color-text-muted);
  cursor: default;
  opacity: 0.6;
}

.matrix-cell.coming-soon:hover {
  transform: none;
  box-shadow: none;
}

.matrix-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border-light);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 10px;
  color: var(--color-text-muted);
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 2px;
}

.legend-dot.mastered {
  background: var(--color-correct-bg);
  border: 1px solid #2e7d32;
}

.legend-dot.learning {
  background: #fff3e0;
  border: 1px solid #e65100;
}

.legend-dot.not-started {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
}

/* Mobile mastery matrix */
@media (max-width: 900px) {
  .mastery-matrix-panel {
    position: fixed;
    right: 0;
    left: 0;
    top: auto;
    bottom: 0;
    width: 100%;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    border-left: none;
    border-top: 1px solid var(--color-border);
    transform: translateY(calc(100% - 48px));
  }

  .mastery-matrix-panel.collapsed {
    transform: translateY(calc(100% - 48px));
  }

  .mastery-matrix-panel.expanded {
    transform: translateY(0);
  }

  .matrix-toggle {
    position: static;
    width: 100%;
    height: 48px;
    flex-direction: row;
    border: none;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }

  .matrix-toggle span {
    writing-mode: horizontal-tb;
  }

  .matrix-content {
    max-height: 50vh;
  }

  .mastery-matrix-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Beta Banner */
.beta-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-xs) var(--spacing-md);
  background: linear-gradient(135deg, #f39c12 0%, #e67e22 100%);
  color: white;
  font-size: var(--font-size-sm);
}

.beta-badge {
  background: rgba(255, 255, 255, 0.2);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.5px;
}

.beta-text {
  font-weight: 500;
}

/* Beta Footer */
.beta-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.beta-footer a {
  color: var(--color-primary);
  text-decoration: none;
}

.beta-footer a:hover {
  text-decoration: underline;
}

.footer-separator {
  color: var(--color-border);
}

@media (max-width: 600px) {
  .beta-banner {
    flex-wrap: wrap;
    text-align: center;
  }

  .beta-footer {
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .footer-separator {
    display: none;
  }
}