/* CSS Custom Properties for Theming */
:root {
  /* Light theme colors */
  --bg-primary: #fefef8;
  --bg-secondary: #f8f8f0;
  --text-primary: #2c2c2c;
  --text-secondary: #666666;
  --text-muted: #999999;
  --border-color: #e0e0e0;
  --shadow-light: rgba(0, 0, 0, 0.1);
  --shadow-medium: rgba(0, 0, 0, 0.15);
  
  /* Accent colors */
  --accent-primary: #3b82f6;
  --accent-hover: #2563eb;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  
  /* Spanish word styling */
  --spanish-word-color: #059669;
  --spanish-word-bg: rgba(5, 150, 105, 0.1);
  
  /* Candidate word styling */
  --candidate-word-color: #3b82f6;
  --candidate-word-bg: rgba(59, 130, 246, 0.1);
  --candidate-underline: #3b82f6;
  
  /* Review word styling */
  --review-word-color: #f59e0b;
  --review-word-bg: rgba(245, 158, 11, 0.15);
  --review-word-border: #f59e0b;
  
  /* Typing interface styling */
  --typing-bg: #f8f9fa;
  --typing-border: #dee2e6;
  --typing-input-bg: #ffffff;
  --typing-input-border: #ced4da;
  --typing-input-focus: #3b82f6;
  --typing-success-bg: rgba(16, 185, 129, 0.1);
  --typing-success-border: #10b981;
  --typing-error-bg: rgba(239, 68, 68, 0.1);
  --typing-error-border: #ef4444;
  
  /* Typography */
  --reading-font-size: 18px;
  --font-family-reading: 'Georgia', 'Times New Roman', serif;
  --font-family-ui: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  --line-height-reading: 1.6;
  --line-height-ui: 1.4;
  
  /* Layout */
  --container-max-width: 800px;
  --reading-max-width: 700px;
  --border-radius: 8px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
}

/* Dark theme */
[data-theme="dark"] {
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --text-primary: #e5e5e5;
  --text-secondary: #b3b3b3;
  --text-muted: #888888;
  --border-color: #404040;
  --shadow-light: rgba(0, 0, 0, 0.3);
  --shadow-medium: rgba(0, 0, 0, 0.4);
  
  --spanish-word-color: #34d399;
  --spanish-word-bg: rgba(52, 211, 153, 0.15);
  
  --candidate-word-color: #60a5fa;
  --candidate-word-bg: rgba(96, 165, 250, 0.15);
  --candidate-underline: #60a5fa;
}

/* Sepia theme */
[data-theme="sepia"] {
  --bg-primary: #f4f1ea;
  --bg-secondary: #ede6d3;
  --text-primary: #5c4b37;
  --text-secondary: #8b7355;
  --text-muted: #a08660;
  --border-color: #d4c4a8;
  
  --spanish-word-color: #059669;
  --candidate-word-color: #7c2d12;
}

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

body {
  font-family: var(--font-family-ui);
  line-height: var(--line-height-ui);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Container */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Header */
.app-header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.app-title {
  font-size: 1.5rem;
  font-weight: 600;
}

.app-title a {
  text-decoration: none;
  color: var(--text-primary);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* Buttons */
.btn {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-family: var(--font-family-ui);
  font-size: 0.9rem;
  transition: all 0.2s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

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

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

.btn:disabled:hover {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--border-color);
}

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

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

.btn-icon {
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Font size controls */
.font-size-controls {
  display: flex;
  gap: 2px;
}

.font-size-controls .btn {
  border-radius: 0;
  font-size: 0.8rem;
}

.font-size-controls .btn:first-child {
  border-top-left-radius: var(--border-radius);
  border-bottom-left-radius: var(--border-radius);
}

.font-size-controls .btn:last-child {
  border-top-right-radius: var(--border-radius);
  border-bottom-right-radius: var(--border-radius);
}

/* Main Content */
.main-content {
  min-height: calc(100vh - 120px);
  padding: var(--spacing-xl) 0;
}

/* Reading Area */
.reading-container {
  max-width: var(--reading-max-width);
  margin: 0 auto;
  background-color: var(--bg-secondary);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 6px var(--shadow-light);
  overflow: hidden;
  min-height: 75vh;
  display: flex;
  flex-direction: column;
}

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

.page-info {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.progress-bar {
  width: 200px;
  height: 4px;
  background-color: var(--border-color);
  border-radius: 2px;
  overflow: hidden;
}

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

/* Reading Text */
.reading-text {
  flex: 1;
  padding: var(--spacing-xl);
  font-family: var(--font-family-reading);
  font-size: var(--reading-font-size);
  line-height: var(--line-height-reading);
  text-align: justify;
  hyphens: auto;
  overflow-y: auto;
  min-height: 0;
}

/* Paragraph styling for book-like appearance */
.reading-text p {
  text-indent: 2em;
  margin-bottom: 0.5em;
  margin-top: 0;
}

/* Optional: Don't indent the first paragraph */
.reading-text p:first-child {
  text-indent: 0;
}

/* Custom scrollbar styling for reading text */
.reading-text::-webkit-scrollbar {
  width: 8px;
}

.reading-text::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

.reading-text::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

.reading-text::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Word Styling */
.spanish-word {
  color: var(--spanish-word-color);
  background-color: var(--spanish-word-bg);
  padding: 1px 3px;
  border-radius: 3px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.spanish-word:hover {
  background-color: var(--spanish-word-color);
  color: white;
}

/* Learned word styling (alias for spanish-word) */
.learned-word {
  color: var(--spanish-word-color);
  background-color: var(--spanish-word-bg);
  padding: 1px 3px;
  border-radius: 3px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.learned-word:hover {
  background-color: var(--spanish-word-color);
  color: white;
}

.candidate-word {
  color: var(--candidate-word-color);
  background-color: var(--candidate-word-bg);
  padding: 1px 3px;
  border-radius: 3px;
  border-bottom: 2px solid var(--candidate-underline);
  cursor: pointer;
  position: relative;
  transition: all 0.2s ease;
}

.candidate-word:hover {
  background-color: var(--candidate-word-color);
  color: white;
  transform: translateY(-1px);
}

/* Review word styling (for spaced repetition) */
.review-word {
  color: var(--review-word-color);
  background: linear-gradient(135deg, var(--review-word-bg), rgba(245, 158, 11, 0.2));
  padding: 2px 6px;
  border-radius: 4px;
  border: 2px dashed var(--review-word-border);
  cursor: pointer;
  position: relative;
  transition: all 0.3s ease;
  font-weight: 600;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.review-word:hover {
  background: linear-gradient(135deg, var(--review-word-color), #d97706);
  color: white;
  transform: translateY(-1px) scale(1.02);
  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
}

.review-word::before {
  content: "📝";
  position: absolute;
  top: -8px;
  left: -8px;
  font-size: 12px;
  background: var(--review-word-color);
  color: white;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 8px;
}

/* Navigation */
.reading-navigation {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
}

.nav-buttons {
  display: flex;
  gap: var(--spacing-sm);
}

/* Word Learning Actions */
.word-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  justify-content: center;
  padding: var(--spacing-md) 0;
}

.word-actions > div:last-child {
  display: flex;
  gap: var(--spacing-sm);
}

.candidate-info {
  text-align: center;
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.btn-accept {
  background-color: var(--success-color);
  color: white;
  border-color: var(--success-color);
}

.btn-accept:hover {
  background-color: #059669;
  border-color: #059669;
}

.btn-skip {
  background-color: var(--warning-color);
  color: white;
  border-color: var(--warning-color);
}

.btn-skip:hover {
  background-color: #d97706;
  border-color: #d97706;
}

/* Typing Interface (Spaced Repetition) */
.word-typing-interface {
  background: var(--typing-bg);
  border: 1px solid var(--typing-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.typing-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.review-indicator {
  display: block;
  font-size: 0.9rem;
  color: var(--review-word-color);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.original-word {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: var(--spacing-sm) 0;
  font-family: var(--font-family-reading);
}

.typing-instruction {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-top: var(--spacing-sm);
}

.typing-input-section {
  margin-bottom: var(--spacing-lg);
}

.typing-input {
  width: 100%;
  padding: var(--spacing-md);
  font-size: 1.1rem;
  border: 2px solid var(--typing-input-border);
  border-radius: var(--border-radius);
  background: var(--typing-input-bg);
  font-family: var(--font-family-ui);
  transition: all 0.3s ease;
}

.typing-input:focus {
  outline: none;
  border-color: var(--typing-input-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.typing-actions {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  margin-top: var(--spacing-md);
}

.btn-submit {
  background-color: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
  padding: var(--spacing-sm) var(--spacing-lg);
}

.btn-submit:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-reveal {
  background-color: var(--warning-color);
  color: white;
  border-color: var(--warning-color);
  padding: var(--spacing-sm) var(--spacing-lg);
}

.btn-reveal:hover {
  background-color: #d97706;
  border-color: #d97706;
}

.typing-feedback {
  text-align: center;
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-top: var(--spacing-md);
  transition: all 0.3s ease;
}

.typing-feedback.success {
  background: var(--typing-success-bg);
  border: 1px solid var(--typing-success-border);
  color: var(--success-color);
}

.typing-feedback.error {
  background: var(--typing-error-bg);
  border: 1px solid var(--typing-error-border);
  color: var(--error-color);
}

.typing-feedback.warning {
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid var(--warning-color);
  color: var(--warning-color);
}

.feedback-message {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.attempt-counter {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.typing-answer {
  text-align: center;
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  margin-top: var(--spacing-md);
}

.correct-answer {
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.correct-answer span {
  font-weight: 700;
  color: var(--success-color);
  font-size: 1.2rem;
}

.btn-continue {
  background-color: var(--success-color);
  color: white;
  border-color: var(--success-color);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-weight: 600;
}

.btn-continue:hover {
  background-color: #059669;
  border-color: #059669;
}

/* Popover */
.popover {
  position: absolute;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  box-shadow: 0 8px 16px var(--shadow-medium);
  z-index: 1000;
  max-width: 300px;
  font-family: var(--font-family-ui);
  font-size: 0.9rem;
  line-height: var(--line-height-ui);
  pointer-events: auto;
  /* Add invisible padding area for easier mouse targeting */
}

.popover::before {
  content: '';
  position: absolute;
  top: -10px;
  left: -10px;
  right: -10px;
  bottom: -10px;
  background: transparent;
  pointer-events: auto;
  z-index: -1;
}

.popover-arrow {
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-bottom: 6px solid var(--bg-primary);
}

.popover-translation {
  font-weight: 600;
  color: var(--spanish-word-color);
  margin-bottom: var(--spacing-xs);
}

/* Enhanced hover area for popover content */
.popover-hover-area {
  position: relative;
}

.popover-hover-area::before {
  content: '';
  position: absolute;
  top: -8px;
  left: -8px;
  right: -8px;
  bottom: -8px;
  background: transparent;
  pointer-events: auto;
  z-index: -1;
}

.popover-definition {
  color: var(--text-secondary);
  font-style: italic;
}

.popover-loading {
  color: var(--text-muted);
  text-align: center;
}

/* Error Messages */
.error-message {
  background-color: var(--error-color);
  color: white;
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-lg);
  position: relative;
}

.error-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.error-close {
  background: none;
  border: none;
  color: white;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0;
  margin-left: auto;
}

/* Footer */
.app-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-lg) 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .app-header .container {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .reading-container {
    margin: 0 -var(--spacing-sm);
    border-radius: 0;
    min-height: 75vh;
  }
  
  .reading-text {
    padding: var(--spacing-lg);
    font-size: calc(var(--reading-font-size) - 2px);
  }
  
  /* Adjust paragraph indentation for mobile */
  .reading-text p {
    text-indent: 1.5em;
  }
  
  .reading-navigation {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .progress-bar {
    width: 100%;
  }
  
  .header-controls {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .reading-container {
    min-height: 70vh;
  }
  
  .reading-text {
    text-align: left;
    hyphens: none;
  }
  
  .nav-buttons {
    flex-direction: column;
    width: 100%;
  }
  
  .nav-buttons .btn {
    width: 100%;
  }
}

/* Loading animations */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.loading {
  animation: pulse 1.5s ease-in-out infinite;
}

/* Focus styles for accessibility */
.btn:focus,
.candidate-word:focus,
.spanish-word:focus,
.learned-word:focus {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* Print styles */
@media print {
  .app-header,
  .app-footer,
  .reading-navigation,
  .word-actions {
    display: none;
  }
  
  .reading-container {
    box-shadow: none;
    border: none;
  }
  
  .spanish-word,
  .learned-word,
  .candidate-word {
    background-color: transparent !important;
    color: inherit !important;
  }
}

/* ============================================================================
   TEXT-TO-SPEECH (TTS) FEATURES
   ============================================================================ */

/* Speaker Button Base Styles */
.speaker-btn {
  background: none;
  border: none;
  cursor: pointer !important;
  padding: 6px;
  border-radius: var(--border-radius);
  transition: all 0.2s ease;
  font-size: 1rem;
  opacity: 0.7;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  min-height: 24px;
  position: relative;
  overflow: hidden;
  z-index: 10; /* Ensure speaker button is above other elements */
}

.speaker-btn:hover {
  opacity: 1;
  background: var(--bg-secondary);
  transform: scale(1.1);
}

.speaker-btn:active {
  transform: scale(0.95);
}

.speaker-btn:focus {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
  opacity: 1;
}

/* Speaker Button States */
.speaker-btn.speaking {
  opacity: 1;
  background: var(--accent-primary);
  color: white;
  animation: speakerPulse 1.5s ease-in-out infinite;
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.3);
}

.speaker-btn.speaking:hover {
  background: var(--accent-hover);
  transform: scale(1.05);
}

.speaker-btn.disabled {
  opacity: 0.3;
  cursor: not-allowed !important;
  background: var(--bg-secondary);
}

.speaker-btn.disabled:hover {
  transform: none;
  opacity: 0.3;
}

/* High-specificity cursor fixes for speaker buttons in all contexts */
.popover .speaker-btn,
.popover-content .speaker-btn,
.translation-content .speaker-btn,
.spanish-word .speaker-btn,
.learned-word .speaker-btn,
.candidate-word .speaker-btn {
  cursor: pointer !important;
}

.popover .speaker-btn:hover,
.popover-content .speaker-btn:hover,
.translation-content .speaker-btn:hover,
.spanish-word .speaker-btn:hover,
.learned-word .speaker-btn:hover,
.candidate-word .speaker-btn:hover {
  cursor: pointer !important;
}

.speaker-btn.error {
  opacity: 1;
  background: var(--error-color);
  color: white;
  animation: shake 0.5s ease-in-out;
}

/* Mini Speaker Button (for tooltips and compact areas) */
.speaker-btn.mini {
  font-size: 0.8rem;
  padding: 3px;
  min-width: 20px;
  min-height: 20px;
}

/* Speaker Icon */
.speaker-icon {
  pointer-events: none;
  display: inline-block;
  line-height: 1;
  transition: transform 0.2s ease;
}

.speaker-btn:hover .speaker-icon {
  transform: scale(1.1);
}

.speaker-btn.speaking .speaker-icon {
  animation: speakerBounce 0.6s ease-in-out infinite alternate;
}

/* Translation Content Layout with Speaker Button */
.translation-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.translation-content .speaker-btn {
  margin-left: auto;
  flex-shrink: 0;
}

/* TTS Animations */
@keyframes speakerPulse {
  0%, 100% { 
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.3);
  }
  50% { 
    box-shadow: 0 0 0 6px rgba(59, 130, 246, 0.1);
  }
}

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

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-3px); }
  75% { transform: translateX(3px); }
}

/* Dark Theme Adjustments */
[data-theme="dark"] .speaker-btn:hover {
  background: var(--bg-secondary);
}

[data-theme="dark"] .speaker-btn.speaking {
  box-shadow: 0 0 0 2px rgba(96, 165, 250, 0.4);
}

[data-theme="dark"] .speaker-btn.disabled {
  background: var(--bg-secondary);
}

/* Sepia Theme Adjustments */
[data-theme="sepia"] .speaker-btn:hover {
  background: var(--bg-secondary);
}

[data-theme="sepia"] .speaker-btn.speaking {
  background: var(--candidate-word-color);
  box-shadow: 0 0 0 2px rgba(124, 45, 18, 0.3);
}

/* TTS Error State Styling */
.tts-error {
  color: var(--error-color);
  font-size: 0.8rem;
  margin-top: var(--spacing-xs);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.tts-error-icon {
  font-size: 0.9rem;
}

/* Enhanced Tooltip with TTS */
.word-tooltip .speaker-btn {
  font-size: 0.7rem;
  padding: 2px;
  min-width: 16px;
  min-height: 16px;
  opacity: 0.8;
}

.word-tooltip .speaker-btn:hover {
  opacity: 1;
}

/* Responsive Design for TTS Features */
@media (max-width: 768px) {
  .speaker-btn {
    font-size: 0.9rem;
    padding: 4px;
    min-width: 28px;
    min-height: 28px;
  }
  
  .translation-content {
    gap: var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  .speaker-btn {
    font-size: 1rem;
    padding: 6px;
    min-width: 32px;
    min-height: 32px;
  }
  
  .speaker-btn.mini {
    font-size: 0.8rem;
    padding: 4px;
    min-width: 24px;
    min-height: 24px;
  }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  .speaker-btn {
    border: 1px solid var(--border-color);
  }
  
  .speaker-btn:hover {
    border-color: var(--accent-primary);
  }
  
  .speaker-btn.speaking {
    border-color: var(--accent-primary);
    background: var(--accent-primary);
  }
}

/* Reduce Motion for Accessibility */
@media (prefers-reduced-motion: reduce) {
  .speaker-btn {
    transition: none;
  }
  
  .speaker-btn.speaking {
    animation: none;
  }
  
  .speaker-icon {
    transition: none;
  }
  
  .speaker-btn.speaking .speaker-icon {
    animation: none;
  }
  
  @keyframes speakerPulse {
    0%, 100% { 
      box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.3);
    }
  }
}

/* Print Styles - Hide TTS Elements */
@media print {
  .speaker-btn,
  .tts-error {
    display: none !important;
  }
}

/* Authentication UI Styles */

/* User Menu */
.user-menu {
  position: relative;
  margin-right: var(--spacing-md);
}

.user-button {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  color: var(--text-primary);
  cursor: pointer;
  font-family: var(--font-family-ui);
  font-size: 0.9rem;
  transition: all 0.2s ease;
}

.user-button:hover {
  background: var(--bg-primary);
  border-color: var(--accent-primary);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px var(--shadow-light);
}

.user-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border-color);
}

.user-name {
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.dropdown-arrow {
  font-size: 0.7rem;
  transition: transform 0.2s ease;
}

.user-button:hover .dropdown-arrow {
  transform: rotate(180deg);
}

/* User Dropdown */
.user-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: var(--spacing-xs);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 12px var(--shadow-medium);
  min-width: 180px;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all 0.2s ease;
}

.user-dropdown.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: block;
  padding: var(--spacing-md);
  color: var(--text-primary);
  text-decoration: none;
  font-family: var(--font-family-ui);
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.2s ease;
}

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

.dropdown-item:hover {
  background: var(--bg-secondary);
}

/* Login Button */
.login-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--accent-primary);
  color: white;
  text-decoration: none;
  border-radius: var(--border-radius);
  font-family: var(--font-family-ui);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.2s ease;
  margin-right: var(--spacing-md);
}

.login-button:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

/* Header Controls Layout */
.header-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* Card Background for Auth Components */
:root {
  --card-bg: #ffffff;
  --accent-bg: #f8fafc;
}

[data-theme="dark"] {
  --card-bg: #2d2d2d;
  --accent-bg: #1e1e1e;
}

[data-theme="sepia"] {
  --card-bg: #f9f6f0;
  --accent-bg: #f0ebe2;
}

/* Responsive Design for Auth UI */
@media (max-width: 640px) {
  .user-name {
    display: none;
  }
  
  .user-button {
    padding: var(--spacing-sm);
  }
  
  .login-button {
    padding: var(--spacing-sm);
    font-size: 0.8rem;
  }
  
  .header-controls {
    gap: var(--spacing-xs);
  }
  
  .user-dropdown {
    right: -10px;
    min-width: 160px;
  }
}