/* ==========================================================================
   SJCC LEARN — LEARN ROOM & VIDEO PLAYER CSS (#/learn/:courseId/:lessonId)
   Custom Video Player, Drifting Watermark, Heartbeat Tracker, Transcript & Notes
   ========================================================================== */

.learn-room-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - var(--header-height));
  background-color: var(--surface);
  overflow: hidden;
}

.learn-topbar {
  height: 52px;
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-4);
  flex-shrink: 0;
}

.learn-main-layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Left Syllabus Drawer */
.learn-syllabus-sidebar {
  width: 320px;
  background-color: var(--surface-2);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: width var(--transition-normal);
}

.syllabus-sec-header {
  padding: var(--space-3) var(--space-4);
  background-color: var(--surface-3);
  font-size: var(--text-xs);
  font-weight: var(--font-bold);
  color: var(--text);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.syllabus-les-item {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-light);
  font-size: var(--text-xs);
  color: var(--text-2);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none !important;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.syllabus-les-item:hover {
  background-color: var(--surface-3);
  color: var(--text);
}

.syllabus-les-item.active {
  background-color: var(--primary-soft);
  color: var(--primary);
  font-weight: var(--font-semibold);
  border-left: 3px solid var(--primary);
}

.syllabus-les-item.locked {
  opacity: 0.65;
  cursor: not-allowed;
}

/* Center Video Player Pane */
.learn-player-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  background-color: var(--surface);
}

.video-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: #000000;
  overflow: hidden;
}

.video-container video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* Drifting Watermark to Deter Screen Recording */
.player-watermark {
  position: absolute;
  top: 15%;
  left: 15%;
  color: rgba(255, 255, 255, 0.35);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: bold;
  pointer-events: none;
  user-select: none;
  z-index: 20;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.8);
  animation: watermarkDrift 45s infinite alternate ease-in-out;
}

@keyframes watermarkDrift {
  0% { transform: translate(0, 0); }
  25% { transform: translate(120px, 80px); }
  50% { transform: translate(40px, 200px); }
  75% { transform: translate(220px, 120px); }
  100% { transform: translate(100px, 10px); }
}

/* Custom Player Controls Bar */
.player-controls {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.85));
  padding: var(--space-3) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  z-index: 30;
  transition: opacity var(--transition-fast);
}

.player-seekbar {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-pill);
  position: relative;
  cursor: pointer;
}

.player-seekbar-fill {
  height: 100%;
  background: var(--primary);
  border-radius: var(--radius-pill);
  width: 0%;
}

.player-controls-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #FFFFFF;
  font-size: var(--text-xs);
}

.player-btn {
  background: transparent;
  border: none;
  color: #FFFFFF;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
  border-radius: var(--radius-circle);
  transition: background var(--transition-fast);
}

.player-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* Threshold Progress Banner */
.threshold-banner {
  background-color: var(--surface-2);
  border-bottom: 1px solid var(--border);
  padding: var(--space-3) var(--space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
}

.threshold-banner.unlocked {
  background-color: var(--success-soft);
  color: var(--success);
  font-weight: var(--font-semibold);
}

/* Learn Tabs Pane (Transcript, Notes, Q&A) */
.learn-tabs-area {
  padding: var(--space-5);
  border-top: 1px solid var(--border);
  background-color: var(--surface);
}

.transcript-line {
  padding: 8px 12px;
  border-radius: var(--radius-xs);
  cursor: pointer;
  display: flex;
  gap: var(--space-3);
  font-size: var(--text-sm);
  transition: background var(--transition-fast);
}

.transcript-line:hover {
  background-color: var(--surface-2);
}

.transcript-time {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--primary);
  flex-shrink: 0;
}

@media (max-width: 900px) {
  .learn-room-container {
    height: auto;
    min-height: calc(100vh - var(--header-height));
    overflow-y: auto;
  }
  .learn-topbar {
    height: auto;
    min-height: 52px;
    padding: var(--space-2) var(--space-3);
    flex-wrap: wrap;
    gap: var(--space-2);
  }
  .learn-main-layout {
    flex-direction: column;
  }
  .learn-syllabus-sidebar {
    width: 100%;
    max-height: 220px;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
}

@media (max-width: 600px) {
  .learn-topbar {
    padding: var(--space-2);
  }
  .learn-topbar > div:first-child {
    max-width: calc(100% - 40px);
  }
  .learn-topbar strong {
    display: block;
    max-width: 220px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .learn-topbar > div:last-child {
    width: 100%;
    justify-content: space-between;
  }
  .player-watermark {
    font-size: 0.65rem;
    animation: watermarkDriftMobile 30s infinite alternate ease-in-out;
  }
  @keyframes watermarkDriftMobile {
    0% { transform: translate(0, 0); }
    50% { transform: translate(60px, 30px); }
    100% { transform: translate(20px, 60px); }
  }
  .learn-tabs-area {
    padding: var(--space-3);
  }
}