/* ==========================================================================
   ATLAS ACADEMY - Classroom & Lesson Player Styles (Production Polish)
   ========================================================================== */

.lesson-workspace {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  min-height: calc(100vh - var(--header-height));
  background-color: var(--bg-body);
}

.lesson-main-col {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border-subtle);
  overflow-y: auto;
  max-height: calc(100vh - var(--header-height));
}

.lesson-sidebar-col {
  background-color: var(--bg-surface-subtle);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  max-height: calc(100vh - var(--header-height));
}

/* Custom Video Player Container */
.player-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: #05070a;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.player-canvas-simulation {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.player-overlay-center {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.35);
  transition: opacity var(--transition-fast);
  cursor: pointer;
}

.player-overlay-center.hidden {
  opacity: 0;
  pointer-events: none;
}

.player-big-play-btn {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.95);
  color: #0f172a;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 32px rgba(255, 255, 255, 0.4);
  transition: transform var(--transition-fast);
}

.player-overlay-center:hover .player-big-play-btn {
  transform: scale(1.08);
}

/* Controls Bar */
.player-controls-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(0deg, rgba(0, 0, 0, 0.92) 0%, rgba(0, 0, 0, 0.45) 70%, transparent 100%);
  padding: 16px 20px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  opacity: 0;
  transition: opacity var(--transition-fast);
  z-index: 10;
}

.player-container:hover .player-controls-bar,
.player-controls-bar:focus-within {
  opacity: 1;
}

/* Scrubber / Progress Bar */
.player-scrubber-track {
  width: 100%;
  height: 6px;
  background-color: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  position: relative;
  cursor: pointer;
  transition: height var(--transition-fast);
}

.player-scrubber-track:hover {
  height: 8px;
}

.player-scrubber-fill {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  background: var(--accent-primary);
  border-radius: var(--radius-full);
  width: 0%;
}

.player-scrubber-thumb {
  position: absolute;
  top: 50%;
  right: -6px;
  transform: translateY(-50%) scale(0);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: #ffffff;
  box-shadow: 0 0 8px rgba(0, 0, 0, 0.5);
  transition: transform var(--transition-fast);
}

.player-scrubber-track:hover .player-scrubber-thumb {
  transform: translateY(-50%) scale(1);
}

/* Controls Row */
.player-controls-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.player-controls-group {
  display: flex;
  align-items: center;
  gap: 14px;
}

.player-control-btn {
  color: #ffffff;
  padding: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.85;
  transition: all var(--transition-fast);
}

.player-control-btn:hover {
  opacity: 1;
  transform: scale(1.1);
}

.player-time-display {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #cbd5e1;
}

.player-speed-select {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
  padding: 4px 8px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  cursor: pointer;
}

.player-speed-select option {
  background-color: #0f172a;
  color: #ffffff;
}

/* Lesson Content Area below player */
.lesson-body {
  padding: 32px;
}

.lesson-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 16px;
}

.lesson-tabs {
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 24px;
  overflow-x: auto;
}

.lesson-tab-btn {
  padding: 12px 16px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.lesson-tab-btn:hover {
  color: var(--text-primary);
}

.lesson-tab-btn.active {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
}

/* Notes Drawer */
.notes-input-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-bottom: 24px;
}

.notes-input-box textarea {
  width: 100%;
  min-height: 80px;
  resize: vertical;
  color: var(--text-primary);
  font-size: 0.9rem;
  line-height: 1.5;
}

.notes-input-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-subtle);
  flex-wrap: wrap;
  gap: 8px;
}

.note-item-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 12px;
  transition: all var(--transition-fast);
}

.note-item-card:hover {
  border-color: var(--border-medium);
}

.note-item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  flex-wrap: wrap;
  gap: 8px;
}

.note-timestamp-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 3px 8px;
  background-color: var(--accent-glow);
  color: var(--accent-primary);
  border-radius: 4px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.note-timestamp-badge:hover {
  background-color: var(--accent-primary);
  color: #ffffff;
}

/* Sidebar Syllabus Navigation */
.syllabus-header {
  padding: 20px;
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
}

.syllabus-course-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.syllabus-module-group {
  border-bottom: 1px solid var(--border-subtle);
}

.syllabus-module-header {
  padding: 14px 20px;
  background-color: var(--bg-surface-subtle);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.syllabus-module-header:hover {
  color: var(--text-primary);
}

.syllabus-lesson-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 20px;
  border-left: 3px solid transparent;
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.syllabus-lesson-item:hover {
  background-color: var(--bg-surface);
  color: var(--text-primary);
}

.syllabus-lesson-item.active {
  background-color: var(--bg-surface-elevated);
  border-left-color: var(--accent-primary);
  color: var(--text-primary);
  font-weight: 600;
}

.syllabus-checkbox {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: 1px solid var(--border-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.syllabus-checkbox:hover {
  border-color: var(--accent-success);
}

.syllabus-lesson-item.completed .syllabus-checkbox {
  background-color: var(--accent-success);
  border-color: var(--accent-success);
  color: #ffffff;
}

.syllabus-lesson-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Responsive adjustments */
@media (max-width: 1024px) {
  .lesson-workspace {
    grid-template-columns: 1fr;
  }
  .lesson-main-col {
    max-height: none;
    border-right: none;
  }
  .lesson-sidebar-col {
    max-height: none;
    border-top: 1px solid var(--border-medium);
  }
  .lesson-body {
    padding: 20px 16px;
  }
}

@media (max-width: 600px) {
  .player-controls-row {
    flex-wrap: wrap;
    gap: 8px;
  }
  .player-time-display {
    font-size: 0.72rem;
  }
  .lesson-top-bar {
    flex-direction: column;
    align-items: flex-start;
  }
}