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

:root {
  /* Colors */
  --primary-color: #146C94;
  --primary-hover: #125a7a; /* 深一點的變化 */
  --primary-light: #AFD3E2; /* 輔助淺色 */
  --secondary-color: #19A7CE; /* 次要按鈕、強調 */
  --danger-color: #E74C3C; /* 保留紅色系警示，也可以改 #FF6B6B */
  --danger-hover: #c0392b;
  --success-color: #2ECC71; /* 保留綠色成功色 */
  --warning-color: #F1C40F; /* 黃色警告 */
  --info-color: #19A7CE; /* info 用亮藍綠 */
  
  /* Backgrounds */
  --bg-primary: #F6F1F1;
  --bg-secondary: #ffffff;
  --bg-tertiary: #AFD3E2;
  --bg-dark: #146C94;
  --bg-gradient: linear-gradient(135deg, #19A7CE 0%, #146C94 100%);
  
  /* Text Colors */
  --text-primary: #146C94;
  --text-secondary: #333333;
  --text-muted: #666666;
  --text-light: #F6F1F1;

  /* Borders */
  --border-color: #e2e8f0;
  --border-light: #f1f5f9;
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --border-radius-lg: 16px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.3s ease;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-secondary);
  overflow-x: hidden;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-md);
}

/* Header */
.header {
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
  overflow: hidden;
  background: var(--bg-gradient);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg) var(--spacing-xl);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-light);
}

.logo i {
  font-size: 1.5rem;
  background: rgba(255, 255, 255, 0.2);
  padding: var(--spacing-sm);
  border-radius: var(--border-radius-sm);
}

.user-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-light);
  font-weight: 500;
}

.user-name {
  background: rgba(255, 255, 255, 0.2);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius);
  backdrop-filter: blur(10px);
}

.settings-btn {
  background: rgba(255, 255, 255, 0.2);
  color: var(--text-light);
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition-normal);
  backdrop-filter: blur(10px);
}

.settings-btn:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: rotate(90deg);
}

/* Text Display Section */
.text-display-section {
  background: var(--bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
}

.text-display-card {
  background: var(--bg-secondary);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-sm);
  border-left: 4px solid var(--primary-color);
  font-size: var(--font-size-lg);
  line-height: 1.8;
  color: var(--text-primary);
  min-height: 80px;
  box-shadow: var(--shadow-sm);
  position: relative;
  font-family: 'Georgia', serif; /* 更適合閱讀的字體 */
}

.text-display-card.reading-mode {
  font-size: 1.2rem;
  line-height: 2;
  letter-spacing: 0.5px;
  background: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
}

/* 閱讀進度指示器（可選） */
.text-display-card.playing {
  animation: gentle-pulse 2s infinite ease-in-out;
}

@keyframes gentle-pulse {
  0%, 100% { 
    box-shadow: 0 0 0 0 rgba(20, 108, 148, 0.3);
  }
  50% { 
    box-shadow: 0 0 0 8px rgba(20, 108, 148, 0.1);
  }
}

/* 響應式 */
@media (max-width: 768px) {
  .text-display-card {
    font-size: var(--font-size-base);
    line-height: 1.6;
    padding: var(--spacing-lg);
  }
}

/* Filter Group */
.filter-group {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.filter-select {
  min-width: 150px;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
}

/* 響應式調整 */
@media (max-width: 768px) {
  .header-actions {
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }
  
  .filter-group {
    order: -1; /* 讓篩選器在手機版時排在最前面 */
    width: 100%;
  }
  
  .filter-select {
    flex: 1;
  }
}

/* Info Card */
.info-card {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  background: var(--bg-primary);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
  position: relative;
  overflow: hidden;
}

.info-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--primary-color);
}

.info-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--primary-light);
  border-radius: var(--border-radius-sm);
  color: var(--primary-color);
}

.info-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.info-content strong {
  font-weight: 600;
  color: var(--text-primary);
}

.info-content span {
  color: var(--text-secondary);
  font-family: monospace;
  font-size: var(--font-size-sm);
}

.status-indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  position: relative;
}

.status-indicator.online {
  background: var(--success-color);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(16, 185, 129, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}

/* Sections */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.section-header h2 {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
}

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

/* Input Section */
.input-section {
  background: var(--bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
}

.textarea-container {
  position: relative;
}

#text {
  width: 100%;
  min-height: 120px;
  padding: var(--spacing-lg);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  resize: vertical;
  transition: var(--transition-normal);
  background: var(--bg-secondary);
}

#text:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.textarea-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--spacing-md);
}

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

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

.char-count {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* Controls Section */
.controls-section {
  background: var(--bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.control-group label {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 500;
  color: var(--text-primary);
  font-size: var(--font-size-sm);
}

.input-field,
.select-field {
  padding: var(--spacing-md);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  transition: var(--transition-normal);
  background: var(--bg-secondary);
}

.input-field:focus,
.select-field:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px var(--primary-light);
}

/* Slider */
.slider-container {
  position: relative;
  margin-top: var(--spacing-sm);
}

.slider {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--border-color);
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: var(--transition-normal);
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-lg);
}

.slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-md);
}

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

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/*
.btn-secondary:hover:not(:disabled) {
  background: #475569;
  transform: translateY(-2px);
}
*/

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

.btn-secondary:hover:not(:disabled) {
  background: #1589a8;
  transform: translateY(-2px);
}

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

.btn-danger:hover:not(:disabled) {
  background: var(--danger-hover);
  transform: translateY(-2px);
}

.btn-sm {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
}

.btn-large {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 50%;
}

/* Action Buttons */
.action-buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
}

/* Status */
.status-container {
  margin-bottom: var(--spacing-xl);
}

.status {
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  animation: slideIn 0.3s ease;
}

.status.loading {
  background: #fef3c7;
  color: #92400e;
  border-left: 4px solid var(--warning-color);
}

.status.success {
  background: #d1fae5;
  color: #065f46;
  border-left: 4px solid var(--success-color);
}

.status.error {
  background: #fee2e2;
  color: #991b1b;
  border-left: 4px solid var(--danger-color);
}

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

/* History Section */
.history-section {
  background: var(--bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
}

.history-container {
  max-height: 500px;
  overflow-y: auto;
  padding-right: var(--spacing-sm);
}

.history-container::-webkit-scrollbar {
  width: 6px;
}

.history-container::-webkit-scrollbar-track {
  background: var(--bg-tertiary);
  border-radius: 3px;
}

.history-container::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

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

.history-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}

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

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.history-text {
  flex: 1;
  font-weight: 500;
  line-height: 1.5;
  color: var(--text-primary);
}

.history-buttons {
  display: flex;
  gap: var(--spacing-xs);
}

.history-buttons .btn {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
  min-width: 32px;
  height: 32px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
  font-weight: 500;
  margin-right: var(--spacing-sm);
  margin-bottom: var(--spacing-xs);
}

/* Tag Filter Section */
.tag-filter-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  animation: slideDown 0.3s ease;
}

.tag-filter-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  font-weight: 500;
  color: var(--text-primary);
}

.tag-filter-container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.filter-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-normal);
  user-select: none;
}

.filter-tag:hover {
  border-color: var(--primary-color);
  background: var(--primary-light);
  transform: translateY(-1px);
}

.filter-tag.active {
  background: var(--primary-color);
  color: var(--text-light);
  border-color: var(--primary-color);
}

.filter-tag .count {
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  padding: 2px 6px;
  font-size: 0.75rem;
  min-width: 18px;
  text-align: center;
}

.filter-tag.active .count {
  background: rgba(255, 255, 255, 0.3);
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
    max-height: 0;
    padding-top: 0;
    padding-bottom: 0;
  }
  to {
    opacity: 1;
    transform: translateY(0);
    max-height: 200px;
    padding-top: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
  }
}

/* Active filter indicator */
.history-section.filtered .section-header h2::after {
  content: '(已篩選)';
  font-size: var(--font-size-sm);
  color: var(--primary-color);
  margin-left: var(--spacing-sm);
  font-weight: normal;
}

/* 響應式 */
@media (max-width: 768px) {
  .tag-filter-header {
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: flex-start;
  }
  
  .filter-tag {
    font-size: var(--font-size-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
  }
}


/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(5px);
}

.modal {
  background: var(--bg-primary);
  padding: var(--spacing-2xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-xl);
  max-width: 500px;
  width: 90%;
  animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

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

.modal-header i {
  font-size: 3rem;
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
}

.modal-header h3 {
  margin: 0;
  color: var(--text-primary);
  font-size: var(--font-size-2xl);
  font-weight: 600;
}

.modal-description {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  line-height: 1.6;
}

.input-group {
  margin-bottom: var(--spacing-xl);
}

.input-group input {
  width: 100%;
  padding: var(--spacing-lg);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  transition: var(--transition-normal);
}

.input-group input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.modal-actions {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.modal-note {
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  backdrop-filter: blur(5px);
}

.loading-spinner {
  text-align: center;
  color: var(--text-light);
}

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--spacing-lg);
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading-spinner p {
  font-size: var(--font-size-lg);
  font-weight: 500;
  margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: var(--spacing-sm);
  }
  
  .header-content {
    padding: var(--spacing-md);
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }
  
  .controls-grid {
    grid-template-columns: 1fr;
  }
  
  .action-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  
  .section-header {
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: stretch;
  }
  
  .header-actions {
    justify-content: center;
  }
  
  .history-header {
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: stretch;
  }
  
  .history-buttons {
    justify-content: center;
  }
  
  .modal {
    margin: var(--spacing-md);
    padding: var(--spacing-lg);
  }
  
  .modal-actions {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .logo {
    font-size: var(--font-size-lg);
  }
  
  .btn-large {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
  }
  
  .input-section,
  .controls-section,
  .history-section {
    padding: var(--spacing-lg);
  }
}

/* Animation Utilities */
.fade-in {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.slide-up {
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Quick Actions */
.quick-actions {
  background: var(--bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
}

.quick-actions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--spacing-md);
}

.quick-action-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition-normal);
  min-height: 80px;
}

.quick-action-btn:hover {
  border-color: var(--primary-color);
  background: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.quick-action-btn i {
  font-size: 1.5rem;
  color: var(--primary-color);
}

/* Shortcuts Modal */
.shortcuts-modal {
  max-width: 600px;
}

.shortcuts-modal .modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-xl);
  text-align: left;
}

.btn-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: 50%;
  transition: var(--transition-fast);
}

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

.shortcuts-content {
  display: grid;
  gap: var(--spacing-lg);
}

.shortcut-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border-radius: var(--border-radius-sm);
  border-left: 4px solid var(--primary-color);
}

.shortcut-item kbd {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  font-family: monospace;
  font-size: var(--font-size-sm);
  font-weight: bold;
  color: var(--text-primary);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  margin: 0 2px;
}

.shortcut-item span {
  color: var(--text-secondary);
  font-weight: 500;
}

/* Enhanced Button States */
.btn:active {
  transform: translateY(0) !important;
  box-shadow: var(--shadow-sm) !important;
}

.btn.loading {
  position: relative;
  color: transparent !important;
}

.btn.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  color: inherit;
}

/* Notification System */
.notification {
  position: fixed;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  background: var(--bg-primary);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  border-left: 4px solid var(--primary-color);
  z-index: 1001;
  animation: slideInRight 0.3s ease;
  max-width: 400px;
}

.notification.success {
  border-left-color: var(--success-color);
}

.notification.error {
  border-left-color: var(--danger-color);
}

.notification.warning {
  border-left-color: var(--warning-color);
}

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

/* Progress Bar */
.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--border-color);
  border-radius: 2px;
  overflow: hidden;
  margin-top: var(--spacing-md);
}

.progress-fill {
  height: 100%;
  background: var(--primary-color);
  border-radius: 2px;
  transition: width 0.3s ease;
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% {
    background-position: -200px 0;
  }
  100% {
    background-position: calc(200px + 100%) 0;
  }
}
.btn:focus,
.input-field:focus,
.select-field:focus,
.textarea:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* 翻譯按鈕樣式 - 改為較低調的樣式 */
#translateBtn {
  transition: all 0.2s ease;
}

#translateBtn:hover:not(:disabled) {
  transform: translateY(-1px);
}

#translateBtn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* 翻譯卡片樣式 */
.translation-card {
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  border: 2px solid #cbd5e1;
  border-radius: 12px;
  padding: 1.5rem;
  margin-top: 1rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  position: relative;
  overflow: hidden;
}

/* 深色模式下的翻譯卡片 */
[data-theme="dark"] .translation-card {
  background: linear-gradient(135deg, #374151 0%, #4b5563 100%);
  border-color: #6b7280;
  color: #f3f4f6;
}

.translation-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1rem;
}

.translation-text {
  flex: 1;
}

.translation-text p {
  margin: 0;
  line-height: 1.6;
  font-size: 1rem;
  color: #374151;
}

[data-theme="dark"] .translation-text p {
  color: #e5e7eb;
}

.translation-text strong {
  color: #1f2937;
  font-weight: 600;
}

[data-theme="dark"] .translation-text strong {
  color: #f9fafb;
}

.translation-attribution {
  flex-shrink: 0;
  display: flex;
  align-items: flex-end;
}

.google-translate-logo {
  height: 20px;
  width: auto;
  opacity: 0.8;
  transition: opacity 0.3s ease;
}

.google-translate-logo:hover {
  opacity: 1;
}

/* 卡片展開動畫 */
.slide-down {
  animation: slideDown 0.4s ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
    max-height: 0;
  }
  to {
    opacity: 1;
    transform: translateY(0);
    max-height: 200px;
  }
}

/* 區別閱讀模式卡片和翻譯卡片 */
.text-display-card {
  background: #ffffff;
  border: 2px solid #e5e7eb;
  border-radius: 12px;
  padding: 1.5rem;
  line-height: 1.8;
  font-size: 1.1rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .text-display-card {
  background: #1f2937;
  border-color: #374151;
  color: #f9fafb;
}

/* 翻譯容器的響應式設計 */
@media (max-width: 768px) {
  .translation-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
  
  .translation-attribution {
    align-self: flex-end;
  }
  
  .google-translate-logo {
    height: 16px;
  }
}

/* 載入狀態的按鈕動畫 */
.translate-btn .fa-spin {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.tts-acknowledgement {
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  font-size: 0.875rem;
  text-align: center;
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
  box-shadow: var(--shadow-sm);
  margin-top: var(--spacing-xl);
}

.tts-acknowledgement a {
  color: var(--primary-color);
  text-decoration: underline;
}

.tts-acknowledgement a:hover {
  color: var(--primary-hover);
}

/* 功能徽章樣式 */
.feature-badge {
  display: flex;
  align-items: center;
}

.badge {
  padding: 0.25rem 0.5rem;
  border-radius: 0.375rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-new {
  background-color: #10b981;
  color: white;
}

/* 跟讀信息卡片樣式 */
.follow-along-info {
  border-left: 4px solid #10b981;
  background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
}

.follow-along-info .info-icon {
  background: #10b981;
  color: white;
}

/* 幫助模態框樣式 */
.help-modal {
  max-width: 600px;
  width: 90vw;
}

.help-content {
  max-height: 60vh;
  overflow-y: auto;
  padding: 1rem 0;
}

.help-section {
  margin-bottom: 2rem;
}

.help-section h4 {
  color: #374151;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.help-section h4 i {
  color: #3b82f6;
}

.help-section ul,
.help-section ol {
  padding-left: 1.5rem;
  line-height: 1.6;
}

.help-section li {
  margin-bottom: 0.5rem;
  color: #6b7280;
}

.help-section kbd {
  background: #f3f4f6;
  border: 1px solid #d1d5db;
  border-radius: 0.25rem;
  padding: 0.125rem 0.25rem;
  font-size: 0.75rem;
  font-family: monospace;
  color: #374151;
}

/* 深色主題支援 */
[data-theme="dark"] .follow-along-info {
  background: linear-gradient(135deg, #064e3b 0%, #065f46 100%);
  border-left-color: #10b981;
}

[data-theme="dark"] .help-section h4 {
  color: #f3f4f6;
}

[data-theme="dark"] .help-section li {
  color: #9ca3af;
}

[data-theme="dark"] .help-section kbd {
  background: #374151;
  border-color: #4b5563;
  color: #f3f4f6;
}