/* CourseOS · Reading View
   Full-screen reading overlay with playback controls,
   study mode buttons, and quote finder toolbar. */

/* Overlay fills the entire screen */
.reading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-secondary);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  animation: slideUp 0.25s ease-out;
}

@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

/* Top bar */
.reading-top-bar {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  background: var(--bg-primary);
  border-bottom: var(--border-width) solid var(--border-color);
  flex-shrink: 0;
  gap: 12px;
  min-height: 48px;
}

.reading-back-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: var(--gray-100);
  color: var(--text-primary);
  font-size: 16px;
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.reading-top-title {
  flex: 1;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.reading-top-spacer {
  width: 32px;
  flex-shrink: 0;
}

/* Mode toggle bar */
.reading-mode-bar {
  display: flex;
  padding: 8px 16px;
  gap: 8px;
  background: var(--bg-primary);
  border-bottom: var(--border-width) solid var(--border-color);
  flex-shrink: 0;
}

.reading-mode-btn {
  flex: 1;
  padding: 8px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: transparent;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-fast);
}

.reading-mode-btn.active {
  border-color: var(--color-teal);
  background: var(--color-teal);
  color: #fff;
}

/* Content area */
.reading-content {
  flex: 1;
  overflow-y: auto;
  padding: 20px 16px 100px;
  -webkit-overflow-scrolling: touch;
}

/* Each paragraph */
.reading-paragraph {
  margin-bottom: 20px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  border-left: 3px solid transparent;
  transition: background 0.3s ease, border-color 0.3s ease;
  position: relative;
}

.reading-paragraph.current {
  background: rgba(35, 199, 175, 0.08);
  border-left-color: var(--color-teal);
}

.reading-paragraph.speaking {
  background: rgba(65, 180, 211, 0.08);
  border-left-color: var(--color-blue);
}

.reading-text {
  font-size: 18px;
  line-height: 1.7;
  color: var(--text-primary);
  font-family: Georgia, 'Times New Roman', serif;
}

/* Per-paragraph controls in study mode */
.reading-para-controls {
  display: flex;
  gap: 8px;
  margin-top: 8px;
  padding-top: 8px;
  border-top: var(--border-width) solid var(--gray-100);
}

.reading-para-play,
.reading-para-explain {
  padding: 6px 12px;
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-full);
  background: var(--bg-primary);
  font-size: 12px;
  cursor: pointer;
}

.reading-para-play:active,
.reading-para-explain:active {
  background: var(--gray-100);
}

/* Explain This container */
.explain-container {
  margin-top: 8px;
  padding: 10px 12px;
  background: #FFF8E6;
  border-radius: var(--radius-sm);
  border-left: 3px solid #FFC121;
}

.explain-text {
  font-size: 14px;
  line-height: 1.6;
  color: #333;
  font-family: var(--font-family);
}

.explain-loading {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
}

/* Quote finder toolbar */
.quote-toolbar {
  position: absolute;
  background: var(--color-navy);
  border-radius: var(--radius-sm);
  padding: 4px;
  gap: 4px;
  z-index: 1001;
  box-shadow: var(--shadow-lg);
}

.quote-btn {
  padding: 6px 10px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

.quote-btn:active {
  background: rgba(255,255,255,0.15);
}

/* Bottom playback bar */
.reading-bottom-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  padding: 10px 16px;
  background: var(--bg-primary);
  border-top: var(--border-width) solid var(--border-color);
  box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
  gap: 12px;
  z-index: 1002;
}

.reading-play-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--color-teal);
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.reading-progress {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  flex: 1;
}

.reading-speed-btns {
  display: flex;
  gap: 4px;
}

.reading-speed-btn {
  padding: 4px 8px;
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-sm);
  background: transparent;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
}

.reading-speed-btn.active {
  background: var(--color-teal);
  color: #fff;
  border-color: var(--color-teal);
}

/* Loading state */
.reading-loading {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 14px;
  color: var(--text-secondary);
}

/* Finished banner */
.reading-finished {
  text-align: center;
  padding: 20px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-teal);
  background: rgba(35, 199, 175, 0.08);
  border-radius: var(--radius-md);
  margin-top: 20px;
}