/* ==== Header tổng thể ==== */
#stv-header {
  background: #fff;
  border-bottom: 1px solid #e9e9e9;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  height: 56px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.03);
}
.stv-left {
  display: flex;
  align-items: center;
  gap: 8px;
}
.stv-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid #eee;
}
.stv-info {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.stv-name {
  font-size: 14px;
  font-weight: 600;
  color: #222;
}

/* ==== Nút Hoạt động ==== */
.stv-status-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: #e8f5e9;
  color: #2e7d32;
  font-size: 12px;
  font-weight: 500;
  border-radius: 20px;
  padding: 3px 8px 3px 5px;
  box-shadow: 0 0 0 0 rgba(0,200,83,0.4);
  animation: pulseActive 2s infinite;
}
.stv-online-dot {
  width: 8px;
  height: 8px;
  background: #00e676;
  border-radius: 50%;
  animation: blinkDot 1.5s infinite;
}
@keyframes blinkDot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
@keyframes pulseActive {
  0% { box-shadow: 0 0 0 0 rgba(0,200,83,0.4); }
  70% { box-shadow: 0 0 0 8px rgba(0,200,83,0); }
  100% { box-shadow: 0 0 0 0 rgba(0,200,83,0); }
}