#ai-chat-toggle {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  border: none;
  background: #222;
  color: #fff;
  font-size: 20px;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.25);
  z-index: 9999;
}

#ai-chat-toggle:hover {
  background: #000;
}

#ai-chat-box {
  position: fixed;
  right: 24px;
  bottom: 94px;
  width: 360px;
  height: 500px;
  background: #ffffff;
  border-radius: 18px;
  box-shadow: 0 10px 35px rgba(0, 0, 0, 0.22);
  overflow: hidden;
  display: none;
  flex-direction: column;
  z-index: 9999;
  font-family: Arial, "Microsoft YaHei", sans-serif;
}

#ai-chat-box.open {
  display: flex;
}

#ai-chat-header {
  background: #222;
  color: #ffffff;
  padding: 14px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#ai-chat-title {
  font-size: 16px;
  font-weight: bold;
}

#ai-chat-subtitle {
  font-size: 12px;
  opacity: 0.75;
  margin-top: 2px;
}

#ai-chat-close {
  background: transparent;
  border: none;
  color: #ffffff;
  font-size: 22px;
  cursor: pointer;
}

#ai-chat-messages {
  flex: 1;
  padding: 14px;
  overflow-y: auto;
  background: #f7f7f7;
}

.ai-msg {
  margin-bottom: 12px;
  display: flex;
}

.ai-msg.user {
  justify-content: flex-end;
}

.ai-msg.assistant {
  justify-content: flex-start;
}

.ai-bubble {
  max-width: 78%;
  padding: 10px 12px;
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

.ai-msg.user .ai-bubble {
  background: #222;
  color: #ffffff;
  border-bottom-right-radius: 4px;
}

.ai-msg.assistant .ai-bubble {
  background: #ffffff;
  color: #333333;
  border-bottom-left-radius: 4px;
}

#ai-chat-input-area {
  display: flex;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid #eeeeee;
  background: #ffffff;
}

#ai-chat-input {
  flex: 1;
  border: 1px solid #dddddd;
  border-radius: 999px;
  padding: 10px 14px;
  outline: none;
  font-size: 14px;
}

#ai-chat-input:focus {
  border-color: #222;
}

#ai-chat-send {
  border: none;
  border-radius: 999px;
  padding: 0 16px;
  background: #222;
  color: #ffffff;
  cursor: pointer;
  font-size: 14px;
}

#ai-chat-send:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

@media screen and (max-width: 480px) {
  #ai-chat-box {
    right: 12px;
    left: 12px;
    width: auto;
    height: 70vh;
    bottom: 86px;
  }

  #ai-chat-toggle {
    right: 18px;
    bottom: 18px;
  }

  .ai-bubble {
    max-width: 86%;
  }
}