/* EDU:PLAYCLASSROOM styles */
#ym-classroom-play {
  display: block;
  width: 100%;
  margin-bottom: 14px;
  padding: 12px;
  background: linear-gradient(135deg, #198754, #0f5132);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.5px;
  box-shadow: 0 3px 10px rgba(25,135,84,.35);
  transition: opacity .2s;
}
#ym-classroom-play:hover { opacity: 0.88; }

#ym-classroom-overlay {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(10,10,30,.97);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 16px;
  box-sizing: border-box;
}

#ym-cls-card {
  background: #fff;
  border-radius: 18px;
  max-width: 820px;
  width: 100%;
  max-height: 72vh;
  overflow-y: auto;
  padding: 2rem;
  font-size: 1.05rem;
  line-height: 1.75;
  box-shadow: 0 8px 50px rgba(0,0,0,.5);
}

#ym-cls-card h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: #1a1a2e;
}

#ym-cls-card img {
  width: 100%;
  border-radius: 10px;
  margin: 0.6rem 0;
  display: block;
}

#ym-cls-card p { margin-bottom: 0.8rem; }

.ym-cls-controls {
  margin-top: 1rem;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

.ym-cls-btn {
  padding: 8px 18px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,.3);
  background: transparent;
  color: #fff;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  transition: background .2s;
}
.ym-cls-btn:hover { background: rgba(255,255,255,.15); }
.ym-cls-btn.speak { background: #ffc107; color: #000; border-color: #ffc107; }
.ym-cls-btn.stop  { background: #6c757d; border-color: #6c757d; }
.ym-cls-btn.exit  { background: #dc3545; border-color: #dc3545; }
.ym-cls-btn:disabled { opacity: 0.4; cursor: not-allowed; }

#ym-cls-counter {
  color: #fff;
  min-width: 70px;
  text-align: center;
  line-height: 2.4;
  font-size: 1rem;
}

.ym-slide-card {
  background: linear-gradient(135deg, #f8f9ff, #fff);
  border-radius: 14px;
  padding: 1.4rem 1.6rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 12px rgba(0,0,0,.07);
}