/* Student Lesson Player */

.player-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 0;
  height: calc(100vh - 64px);
  margin: -24px;
}
@media (max-width: 900px) {
  .player-layout { grid-template-columns: 1fr; height: auto; margin: 0; }
}

.player-main {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.player-topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
}
.player-back { cursor: pointer; font-size: 1.2rem; }
.player-course-title { font-size: 0.85rem; color: var(--text-muted); }
.player-lesson-title { font-weight: 600; }

.player-frame {
  flex: 1;
  background: #000;
  position: relative;
}
.player-frame iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.player-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  background: var(--bg-surface);
}

.player-lessons-bar {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 20px;
  border-top: 1px solid var(--border);
  overflow-x: auto;
  background: var(--bg-card);
}
.lesson-dot {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  flex-shrink: 0;
  border: 2px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-muted);
}
.lesson-dot.completed { border-color: var(--success); color: var(--success); background: rgba(34,197,94,0.1); }
.lesson-dot.current { border-color: var(--primary); color: var(--primary); background: var(--primary-bg); }

.player-progress-bar {
  padding: 0 20px;
  background: var(--bg-surface);
}

/* AI Chat sidebar */
.chat-sidebar {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  background: var(--bg-card);
}
.chat-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.chat-msg {
  max-width: 90%;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  line-height: 1.5;
}
.chat-msg.user {
  align-self: flex-start;
  background: var(--primary);
  color: #fff;
}
.chat-msg.ai {
  align-self: flex-end;
  background: var(--bg-surface);
  border: 1px solid var(--border);
}
.chat-input-area {
  padding: 12px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 8px;
}
.chat-input {
  flex: 1;
  padding: 8px 12px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text);
  font-family: inherit;
  font-size: 0.85rem;
  outline: none;
}
.chat-send {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: var(--primary);
  color: #fff;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ═══════════════════════════════════════ */
/* Video-first Player                      */
/* ═══════════════════════════════════════ */

.player-page { min-height: 100vh; }

.player-frame video {
  width: 100%;
  height: 100%;
  max-height: 65vh;
  background: #000;
  display: block;
}
.player-frame iframe {
  min-height: 55vh;
}

.player-placeholder {
  width: 100%;
  min-height: 55vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.placeholder-content {
  text-align: center;
  color: #fff;
  text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

/* Toggle interactive player button */
.player-mode-toggle {
  padding: 8px 20px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
}
.player-mode-toggle .btn {
  font-size: 0.85rem;
}

/* Interactive player iframe (below video) */
.interactive-player-frame {
  background: #000;
  border: 2px solid var(--primary);
  border-radius: var(--radius);
  margin: 8px 20px;
  overflow: hidden;
}
.interactive-player-frame iframe {
  width: 100%;
  height: 60vh;
  border: none;
  display: block;
}

/* Audio-only player */
.audio-player {
  padding: 12px 20px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
}
.audio-player audio {
  width: 100%;
  border-radius: 8px;
}

/* Player navigation */
.player-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  background: var(--bg-surface);
}

/* Lesson dots row */
.lesson-dots {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 20px;
  overflow-x: auto;
  background: var(--bg-card);
}
.lesson-dot.active {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-bg);
  transform: scale(1.15);
}

/* Chat panel */
.chat-panel {
  display: flex;
  flex-direction: column;
  height: 100%;
  border-right: 1px solid var(--border);
  background: var(--bg-card);
}
.chat-messages {
  min-height: 200px;
}
.chat-message {
  display: flex;
}
.chat-message.user { justify-content: flex-start; }
.chat-message.bot { justify-content: flex-end; }
.chat-bubble {
  max-width: 85%;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  line-height: 1.6;
}
.chat-message.user .chat-bubble {
  background: var(--primary);
  color: #fff;
}
.chat-message.bot .chat-bubble {
  background: var(--bg-surface);
  border: 1px solid var(--border);
}
.chat-message.typing .chat-bubble {
  opacity: 0.6;
  animation: pulse 1s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

/* Sidebar */
.player-sidebar {
  border-right: 1px solid var(--border);
  overflow-y: auto;
}

/* Completed button */
.btn-success, .btn.btn-success {
  background: var(--success) !important;
  border-color: var(--success) !important;
  color: #fff !important;
}

/* Progress bar in player */
.progress-bar-container {
  padding: 0 20px 12px;
}

/* Interactive player fullscreen modal */
.interactive-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.interactive-modal {
  width: 95vw;
  height: 90vh;
  background: #0a0a1a;
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.interactive-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  color: var(--text);
  font-weight: 600;
  font-size: 0.9rem;
  flex-shrink: 0;
}
.interactive-modal iframe {
  flex: 1;
  width: 100%;
  border: none;
}

@media (max-width: 900px) {
  .player-frame video { max-height: 40vh; }
  .player-sidebar { border-right: none; border-top: 1px solid var(--border); }
  .lesson-dots { padding: 6px 12px; }
  .interactive-modal { width: 100vw; height: 100vh; border-radius: 0; }
  .interactive-modal-overlay { padding: 0; }
}