@media (max-width: 768px) {
  #sidebar {
    position: absolute;
    inset: 0;
    width: 100%;
    min-width: 100%;
    z-index: 50;
    transition: transform 0.25s ease;
    display: flex;
    flex-direction: column;
  }

  #sidebar.hidden {
    transform: translateX(-100%);
    pointer-events: none;
  }

  #sidebar .room-list {
    flex: 1;
    overflow-y: auto;
    min-height: 0;
  }

  #sidebar .btn-create {
    flex-shrink: 0;
    position: sticky;
    bottom: 0;
    margin: 8px 12px;
    margin-bottom: max(8px, env(safe-area-inset-bottom));
  }

  .back-btn {
    display: flex;
  }

  .chat-header-info .room-name {
    font-size: 0.9rem;
  }

  .video-grid {
    grid-template-columns: 1fr;
  }

  .call-chat-overlay {
    width: 100%;
  }

  .modal-content {
    min-width: auto;
    margin: 12px;
  }

  .control-btn {
    width: 44px;
    height: 44px;
    font-size: 1rem;
  }

  /* Call controls: safe area */
  .call-controls {
    padding-bottom: max(16px, env(safe-area-inset-bottom));
  }
}

@media (max-width: 480px) {
  .message {
    max-width: 88%;
  }

  .control-btn {
    width: 40px;
    height: 40px;
    font-size: 0.95rem;
  }
}