* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont;
  background: #f7f7f8;
}

.app {
  display: flex;
  height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 260px;
  background: #202123;
  color: #fff;
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar-header button {
  background: #444;
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 4px 8px;
  cursor: pointer;
}

#chatList {
  list-style: none;
  padding: 0;
  margin: 0;
  overflow-y: auto;
}

#chatList li {
  padding: 10px 12px;
  cursor: pointer;
  border-bottom: 1px solid #333;
}

#chatList li.active {
  background: #343541;
}

/* Main */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.topbar {
  padding: 10px;
  background: #fff;
  border-bottom: 1px solid #ddd;
  display: flex;
  justify-content: space-between;
}

.messages {
  flex: 1;
  padding: 20px;
  overflow-y: auto;

  display: flex;
  flex-direction: column;
  gap: 14px;
}


.message {
  margin-bottom: 16px;
  max-width: 800px;
}

.message {
  max-width: 78%;
  padding: 12px 14px;
  border-radius: 16px;
  line-height: 1.6;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
}

.message.user {
  align-self: flex-end;
  background: linear-gradient(135deg, #6fa8ff, #000000);
  color: #03173e;
}

.message.assistant {
  align-self: flex-start;
  background: #fff;
  border: 1px solid #eee;
}


.message.user {
  align-self: flex-end;
  background: #daf1ff;
  padding: 12px;
  border-radius: 12px;
}

.message.assistant {
  background: #fff;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid #eee;
}

.message.thinking {
  color: #888;
  font-style: italic;
}

.inputbar {
  padding: 12px;
  display: flex;
  gap: 10px;
  border-top: 1px solid #ddd;
  background: #fff;
}

textarea {
  flex: 1;
  resize: none;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid #ddd;
  min-height: 48px;
  max-height: 180px;
  outline: none;
}

textarea:focus {
  border-color: #4a90e2;
  box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.15);
}

#sendBtn {
  min-width: 88px;
  border-radius: 14px;
}


.topbar-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.topbar select,
.topbar input {
  height: 34px;
  border-radius: 10px;
  border: 1px solid #ddd;
  padding: 0 10px;
}

.topbar label {
  color: #555;
  font-size: 14px;
}


textarea {
  flex: 1;
  resize: none;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid #ccc;
}

button {
  padding: 8px 14px;
  border-radius: 8px;
  border: none;
  background: #10a37f;
  color: white;
  cursor: pointer;
}

/* 左侧 chat item：标题+日期+删除按钮 */
#chatList li.chat-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.chat-item-left {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.chat-title {
  font-size: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-date {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.65);
}

.chat-del {
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.75);
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 6px;
}

.chat-del:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

/* 消息：内容 + 时间戳 */
.message .msg-meta {
  margin-top: 6px;
  font-size: 12px;
  opacity: 0.65;
}

/* 让 user 的时间戳靠右一点更像聊天软件 */
.message.user .msg-meta {
  text-align: right;
}