#box_main {
  width: 1020px;
  padding-top: 14px;
  padding-left: 20px;
}

.box_title {
  margin-bottom: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#chat_container {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--color-greyLight);
  border-radius: 12px;
  padding: 24px;
  max-height: 660px;
  overflow-y: auto;
  scroll-behavior: smooth;
  margin-bottom: 24px;
}

#chat_container #chat_messages {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow-y: auto;
  padding: 32px 0px;
  line-height: 2;
}

#chat_container .chat_message {
  margin-bottom: 16px;
  padding: 8px 16px;
  border-radius: 12px;
  word-break: break-word;
}

#chat_container .chat_message.user {
  background-color: var(--color-greyLight);
  align-self: flex-end;
  max-width: 70%;
}

#chat_container .chat_message.bot {
  align-self: flex-start;
}

#chat_container .chat_message.bot .thinking {
  display: inline-block;
  font-weight: bold;
  font-size: 16px;
  margin-right: 2px;
  animation: blink 1.2s infinite;
}

#chat_container #chat_input_container {
  display: flex;
  align-items: center;
  margin-top: 32px;
  gap: 8px;
  min-width: 0;
}

#chat_container #chat_input {
  height: 100%;
  flex: 1;
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px var(--color-greyLight) solid;
  font-size: 14px;
  min-width: 0;
}

#chat_container #chat_send_btn {
  width: 36px; /* 固定寬度 */
  height: 36px; /* 固定高度 */
  border: none;
  background-color: var(--color-black);
  color: var(--color-white);
  border-radius: 50%; /* 完全圓形 */
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
}

#chat_container .chat_message.bot span {
  opacity: 0;
  display: inline-block;
  transition: opacity 0.03s linear;
}

#chat_container .chat_message.bot span.visible {
  opacity: 1;
}

#chat_container a {
  color: var(--color-black);
}

#chat_container p {
  margin: 8px 0px;
}

#chat_container ul {
  padding-left: 16px;
  margin: 16px 0px;
}

#chat_container li {
  position: relative;
}

@keyframes blink {
  0%,
  80%,
  100% {
    opacity: 0;
  }
  40% {
    opacity: 1;
  }
}

/******** RWD ********/

@media (max-width: 1300px) {
  #box_main {
    width: 588px;
    padding-left: 0px;
  }

  .box_title {
    display: none;
  }

  #chat_container,
  #chat_container * {
    font-size: 14px;
  }
}

@media (max-width: 768px) {
  #box_main {
    width: 350px;
  }

  #chat_container {
    border: 0px;
    padding: 0px;
    border-radius: 0px;
  }

  #chat_container ul {
    padding-left: 8px;
  }

  body.dark-mode #chat_container {
    background-color: transparent;
  }
}
/* -------- Dark mode -------- */

body.dark-mode #chat_container {
  border: 0px;
  background-color: var(--color-black);
}

body.dark-mode #chat_container .chat_message.user {
  background-color: var(--color-greyDark);
}

body.dark-mode #chat_container #chat_input {
  border: 0px;
  background-color: var(--color-greyDark);
  color: var(--color-white);
}

#chat_container #chat_send_btn {
  background-color: var(--color-greyDark);
}

body.dark-mode #chat_container a {
  color: var(--color-white);
}

@media (max-width: 768px) {
  body.dark-mode #chat_container {
    background-color: transparent;
  }
}