/* 全局样式 */
:root {
  --primary-color: #667eea;
  --primary-dark: #5a67d8;
  --background-color: #f5f5f5;
  --card-background: #ffffff;
  --border-color: #e0e0e0;
  --text-primary: #000000;
  --text-secondary: #6b7280;
}

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--background-color);
}

/* 聊天界面样式 */
.chat-container {
  height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--background-color);
}

/* 顶部导航样式 */
.header {
  background-color: var(--primary-color);
  color: white;
  padding: 16px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header-title {
  margin: 0;
  font-size: 20px;
  font-weight: 600;
}

.header-subtitle {
  margin: 4px 0 0 0;
  font-size: 14px;
  opacity: 0.9;
}

/* 主内容区域样式 */
.main-content {
  flex: 1;
  display: flex;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  height: 100%;
}

/* 侧边栏样式 */
.sidebar {
  width: 25%;
  min-width: 280px;
  background-color: var(--card-background);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 16px;
}

.sidebar-title {
  margin: 0 0 16px 0;
  font-size: 16px;
  font-weight: 600;
}

/* 聊天内容区样式 */
.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: var(--card-background);
}

.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}

/* 消息样式 */
.message-row {
  display: flex;
  margin-bottom: 16px;
  align-items: flex-end;
}

.message-row.user {
  justify-content: flex-end;
}

.message-row.bot {
  justify-content: flex-start;
}

.message-content {
  max-width: 70%;
  display: flex;
  align-items: flex-end;
}

.avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.avatar.bot {
  background-color: var(--primary-color);
  margin-right: 8px;
}

.avatar.user {
  background-color: var(--primary-dark);
  margin-left: 8px;
}

.message-bubble {
  padding: 12px 16px;
  border-radius: 18px;
  position: relative;
}

.message-bubble.user {
  background-color: var(--primary-color);
  color: white;
}

.message-bubble.bot {
  background-color: var(--background-color);
  color: var(--text-primary);
}

.message-time {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  opacity: 0.7;
}

/* 输入区样式 */
.input-area {
  padding: 16px;
  border-top: 1px solid var(--border-color);
  background-color: var(--card-background);
}

.input-container {
  display: flex;
  align-items: flex-end;
}

/* 加载状态样式 */
.loading-indicator {
  display: flex;
  justify-content: flex-start;
  margin-bottom: 16px;
  align-items: center;
}

.loading-dots {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  background-color: var(--background-color);
  border-radius: 18px;
}

.loading-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--primary-color);
  margin: 0 2px;
  animation: pulse 1.4s infinite ease-in-out;
}

.loading-dot:nth-child(2) {
  animation-delay: 0.2s;
}

.loading-dot:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes pulse {
  0%, 60%, 100% {
    transform: scale(0.8);
    opacity: 0.7;
  }
  30% {
    transform: scale(1);
    opacity: 1;
  }
}

/* 移动端适配 */
@media (max-width: 640px) {
  .sidebar {
    display: none;
  }
  
  .message-content {
    max-width: 85%;
  }
}