/* public/css/chat-widget.css */
.chat-widget {
    position: fixed;
    bottom: 100px;
    right: 20px;
    width: 60px;
    height: 60px;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    z-index: 1000;
    transition: transform 0.2s ease;
}
.chat-widget:hover {
    transform: scale(1.1);
}

.chat-box {
    position: fixed;
    bottom: 90px;
    right: 20px;
    width: 350px;
    max-width: 90vw;
    height: 500px;
    max-height: 70vh;
    background: var(--container-bg);
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.2);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    z-index: 1001;
    transform: scale(0.95) translateY(10px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
}
.chat-box.active {
    opacity: 1;
    transform: scale(1) translateY(0);
    pointer-events: auto;
}
.chat-header {
    padding: 12px 15px;
    background: var(--btn-bg);
    color: var(--btn-text);
    font-weight: bold;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
#chatCloseBtn {
    cursor: pointer;
    font-size: 20px;
    opacity: 0.8;
}
#chatCloseBtn:hover {
    opacity: 1;
}
.chat-messages {
    flex-grow: 1;
    padding: 15px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.chat-msg {
    padding: 8px 12px;
    border-radius: 18px;
    max-width: 80%;
    line-height: 1.5;
}
.chat-msg.bot {
    background-color: #f1f0f0;
    border-bottom-left-radius: 4px;
    align-self: flex-start;
}
.chat-msg.user {
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border-bottom-right-radius: 4px;
    align-self: flex-end;
}
.chat-msg.error {
  background-color: #f8d7da;
  color: #721c24;
}

/* 描述: 修正聊天输入框和发送按钮的布局与样式 */
.chat-input-area {
  padding: 10px;
  border-top: 1px solid var(--input-border);
  display: flex;
  align-items: flex-end; /* 垂直底部对齐 */
  gap: 10px;
}
.chat-input-area textarea {
  flex-grow: 1;
  height: 40px;
  min-height: 40px;
  max-height: 100px; /* 制限最大高度 */
  resize: vertical;
  border-radius: 20px;
  padding: 10px 15px;
  box-sizing: border-box;
}
.chat-input-area button {
  flex-shrink: 0; /* 防止按钮被压缩 */
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background-color: var(--btn-bg);
  color: var(--btn-text);
  font-size: 18px;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  /* 【新增】过渡效果：使动画平滑 */
  transition: transform 0.2s ease-out;
}
.chat-input-area button:hover {
  /* 【新增】鼠标悬停时放大1.1倍 */
  transform: scale(1.1);
}