/* ─── Concurrent sessions drawer ─── */
#concurrent-overlay {
  position: fixed;
  inset: 0;
  z-index: 2500;
  pointer-events: none;
}

#concurrent-overlay.open {
  pointer-events: all;
}

#concurrent-panel {
  position: absolute;
  top: 0;
  right: 0;
  width: 330px;
  height: 100%;
  background: rgba(8, 18, 44, .95);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-left: 1px solid rgba(44, 78, 138, .4);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform .25s ease;
  overflow: hidden;
}

#concurrent-overlay.open #concurrent-panel {
  transform: translateX(0);
}

#concurrent-panel-header {
  padding: 14px 14px 10px;
  border-bottom: 1px solid rgba(44, 78, 138, .3);
  display: flex;
  align-items: flex-start;
  gap: 8px;
  flex-shrink: 0;
}

#concurrent-panel-title {
  font-size: .82rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
  flex: 1;
}

#concurrent-panel-subtitle {
  font-size: .68rem;
  color: var(--text-dim);
  margin-top: 3px;
}

#concurrent-close {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.05rem;
  cursor: pointer;
  padding: 2px 4px;
  line-height: 1;
  flex-shrink: 0;
}

#concurrent-close:hover {
  color: var(--text);
}

#concurrent-list {
  flex: 1;
  overflow-y: auto;
  padding: 10px 12px;
}

.concurrent-room-section {
  margin-bottom: 10px;
}

.concurrent-room-label {
  font-size: .62rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: .06em;
  padding: 2px 2px 4px;
  border-bottom: 1px solid rgba(255, 107, 53, .2);
  margin-bottom: 5px;
}

.concurrent-item {
  padding: 8px 10px;
  border-radius: 8px;
  margin-bottom: 5px;
  background: rgba(44, 78, 138, .15);
  border: 1px solid rgba(44, 78, 138, .2);
  cursor: pointer;
  transition: background .15s;
}

.concurrent-item:hover {
  background: rgba(44, 78, 138, .32);
}

.concurrent-item-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

.concurrent-item-title {
  font-size: .74rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 4px;
  line-height: 1.35;
}

.concurrent-item-meta {
  font-size: .63rem;
  color: var(--text-dim);
}

.concurrent-item-details {
  max-height: 0;
  overflow: hidden;
  transition: max-height .25s ease, margin-top .2s ease;
  font-size: .6rem;
  color: var(--text-dim);
  line-height: 1.4;
}

.concurrent-item.expanded .concurrent-item-details {
  max-height: 160px;
  margin-top: 6px;
}

.concurrent-item-details strong {
  color: var(--text);
  font-weight: 600;
}

.concurrent-add-btn {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
  flex-shrink: 0;
  line-height: 1;
  box-shadow: 0 4px 12px rgba(255, 95, 5, .35);
  transition: transform .15s, box-shadow .15s;
}

.concurrent-add-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(255, 95, 5, .45);
}

.ride-empty {
  text-align: center;
  color: var(--text-dim);
  padding: 48px 20px;
  font-size: .82rem;
  line-height: 1.6;
}