#bb-chat-bubble {
    position: fixed; bottom: 24px; right: 24px;
    width: 56px; height: 56px; border-radius: 50%;
    background: #2563eb; color: white; font-size: 26px;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; box-shadow: 0 4px 16px rgba(0,0,0,0.2);
    z-index: 9999;
  }
  #bb-chat-box {
    display: none; position: fixed; bottom: 90px; right: 24px;
    width: 340px; height: 480px; background: white;
    border-radius: 16px; box-shadow: 0 8px 32px rgba(0,0,0,0.15);
    flex-direction: column; z-index: 9999; overflow: hidden;
    font-family: sans-serif;
  }
  #bb-chat-header {
    background: #2563eb; color: white; padding: 16px;
    font-weight: bold; font-size: 15px;
  }
  #bb-chat-messages {
    flex: 1; overflow-y: auto; padding: 16px;
    display: flex; flex-direction: column; gap: 10px;
  }
  .bb-msg { max-width: 80%; padding: 10px 14px; border-radius: 12px; font-size: 14px; line-height: 1.4; }
  .bb-bot { background: #f1f5f9; color: #1e293b; align-self: flex-start; border-bottom-left-radius: 4px; }
  .bb-user { background: #2563eb; color: white; align-self: flex-end; border-bottom-right-radius: 4px; }
  #bb-chat-input-row {
    display: flex; padding: 12px; border-top: 1px solid #e2e8f0; gap: 8px;
  }
  #bb-chat-input {
    flex: 1; border: 1px solid #e2e8f0; border-radius: 8px;
    padding: 10px; font-size: 14px; outline: none;
  }
  #bb-chat-send {
    background: #2563eb; color: white; border: none;
    border-radius: 8px; padding: 10px 16px; cursor: pointer; font-size: 14px;
  }
  .bb-typing { color: #94a3b8; font-size: 13px; font-style: italic; }