/* classroom.css - Estilos das Páginas de Módulos (Aulas) */
.classroom-layout {
  padding: 160px 8% 60px 8%;
  max-width: 1300px;
  margin: 0 auto;
}

.classroom-header {
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 20px;
}

.back-btn {
  background: transparent;
  border: none;
  color: var(--accent-cyan);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  margin-bottom: 15px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
}

.video-container-box {
  width: 100%;
  height: 480px;
  background: #000;
  border-radius: 24px;
  overflow: hidden;
  margin-bottom: 40px;
  border: 1px solid var(--border-color);
}

.video-container-box iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.academic-text-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 40px;
  margin-bottom: 40px;
}

.academic-text-wrapper h2 {
  font-size: 28px;
  margin-bottom: 20px;
  border-left: 4px solid var(--accent-purple);
  padding-left: 15px;
}

.academic-text-wrapper h3 {
  font-size: 20px;
  margin: 25px 0 12px 0;
  color: var(--accent-cyan);
}

.academic-text-wrapper p {
  font-size: 16px;
  color: var(--text-primary);
  margin-bottom: 18px;
  text-align: justify;
}

.academic-text-wrapper ul, .academic-text-wrapper ol {
  margin-left: 25px;
  margin-bottom: 20px;
}

.academic-text-wrapper li {
  margin-bottom: 8px;
  font-size: 15px;
}

/* Área Interativa de Áudio / Teclado */
.interactive-audio-engine {
  background: rgba(123, 97, 255, 0.05);
  border: 1px dashed var(--accent-purple);
  border-radius: 16px;
  padding: 25px;
  margin: 30px 0;
}

.audio-engine-title {
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 15px;
}

.notes-piano-roll {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.piano-key {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  padding: 14px 20px;
  border-radius: 10px;
  font-weight: 700;
  cursor: pointer;
  user-select: none;
  transition: var(--transition-smooth);
  text-align: center;
  min-width: 75px;
}

.piano-key:hover {
  background: var(--accent-purple);
  color: #FFF;
  transform: scale(1.05);
}