/* 全局重置 & 基础变量 */
:root {
  /* 亮色主题 */
  --light-bg: #f7f8fa;
  --light-card-bg: #ffffff;
  --light-text: #1d2129;
  --light-text-secondary: #4e5969;
  --light-border: #e5e6eb;
  --light-hover: #f2f3f5;
  --light-user-msg: #0084ff;
  --light-ai-msg: #f2f3f5;
  --light-navbar: #ffffff;
  --light-hint: #86909c;
  --light-sidebar-bg: #f7f8fa;
  --light-sidebar-hover: #e5e6eb;
  --light-sidebar-active: #e5efff;
  --light-sidebar-divider: #e5e6eb;
  --light-toast-success: #52c41a;
  --light-toast-error: #ff4d4f;
  --light-toast-warning: #faad14;
  --light-toast-info: #1890ff;

  /* 暗色主题 */
  --dark-bg: #18191a;
  --dark-card-bg: #242526;
  --dark-text: #e4e6eb;
  --dark-text-secondary: #b0b3b8;
  --dark-border: #3a3b3c;
  --dark-hover: #3a3b3c;
  --dark-user-msg: #0084ff;
  --dark-ai-msg: #3a3b3c;
  --dark-navbar: #242526;
  --dark-hint: #8d8f92;
  --dark-sidebar-bg: #242526;
  --dark-sidebar-hover: #3a3b3c;
  --dark-sidebar-active: #1e40af;
  --dark-sidebar-divider: #3a3b3c;
  --dark-toast-success: #52c41a;
  --dark-toast-error: #ff4d4f;
  --dark-toast-warning: #faad14;
  --dark-toast-info: #1890ff;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

/* 亮色/暗色主题 */
.light-theme {
  --bg: var(--light-bg);
  --card-bg: var(--light-card-bg);
  --text: var(--light-text);
  --text-secondary: var(--light-text-secondary);
  --border: var(--light-border);
  --hover: var(--light-hover);
  --user-msg: var(--light-user-msg);
  --ai-msg: var(--light-ai-msg);
  --navbar: var(--light-navbar);
  --hint: var(--light-hint);
  --sidebar-bg: var(--light-sidebar-bg);
  --sidebar-hover: var(--light-sidebar-hover);
  --sidebar-active: var(--light-sidebar-active);
  --sidebar-divider: var(--light-sidebar-divider);
  --toast-success: var(--light-toast-success);
  --toast-error: var(--light-toast-error);
  --toast-warning: var(--light-toast-warning);
  --toast-info: var(--light-toast-info);
}

.dark-theme {
  --bg: var(--dark-bg);
  --card-bg: var(--dark-card-bg);
  --text: var(--dark-text);
  --text-secondary: var(--dark-text-secondary);
  --border: var(--dark-border);
  --hover: var(--dark-hover);
  --user-msg: var(--dark-user-msg);
  --ai-msg: var(--dark-ai-msg);
  --navbar: var(--dark-navbar);
  --hint: var(--dark-hint);
  --sidebar-bg: var(--dark-sidebar-bg);
  --sidebar-hover: var(--dark-sidebar-hover);
  --sidebar-active: var(--dark-sidebar-active);
  --sidebar-divider: var(--dark-sidebar-divider);
  --toast-success: var(--dark-toast-success);
  --toast-error: var(--dark-toast-error);
  --toast-warning: var(--dark-toast-warning);
  --toast-info: var(--dark-toast-info);
}

/* 全局样式 */
body {
  background-color: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background-color 0.3s, color 0.3s;
  line-height: 1.5;
  font-size: 15px;
  display: flex;
  overflow: hidden;
}

.mobile-only {
  display: none;
}

@media (max-width: 768px) {
  .mobile-only {
    display: block;
  }
}

/* 侧边栏样式 */
.sidebar {
  width: 260px;
  background-color: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  height: 100vh;
  transition: transform 0.3s;
  z-index: 200;
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    transform: translateX(-100%);
    top: 0;
    left: 0;
  }
  
  .sidebar.show {
    transform: translateX(0);
  }
}

.sidebar-header {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sidebar-header h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

#newChatBtn {
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background-color: var(--card-bg);
  color: var(--text);
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: background-color 0.2s;
}

#newChatBtn:hover {
  background-color: var(--sidebar-hover);
}

.sidebar-divider {
  height: 1px;
  background-color: var(--sidebar-divider);
  margin: 0 16px;
}

/* 会话列表 */
.conversation-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.conversation-item {
  padding: 10px 12px;
  border-radius: 8px;
  margin-bottom: 4px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color 0.2s;
}

.conversation-item:hover {
  background-color: var(--sidebar-hover);
}

.conversation-item.active {
  background-color: var(--sidebar-active);
  color: var(--user-msg);
}

.conversation-content {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  overflow: hidden;
}

.conversation-title {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 180px;
  font-size: 14px;
}

.conversation-time {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.conversation-delete-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: none;
  background-color: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
}

.conversation-item:hover .conversation-delete-btn {
  display: flex;
}

.conversation-delete-btn:hover {
  background-color: var(--hover);
  color: var(--text);
}

/* 侧边栏底部 */
.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--sidebar-divider);
}

.api-status {
  font-size: 12px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.api-status i {
  font-size: 8px;
  color: #52c41a;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { opacity: 1; }
  50% { opacity: 0.5; }
  100% { opacity: 1; }
}

/* 主内容区 */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* 顶部导航栏 */
.navbar {
  background-color: var(--navbar);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0 20px;
}

.navbar-content {
  max-width: 100%;
  height: 60px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.navbar h1 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.navbar-actions {
  display: flex;
  gap: 12px;
}

.navbar-actions button {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background-color: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s, color 0.2s;
}

.navbar-actions button.active {
  color: var(--user-msg);
  background-color: var(--hover);
}

.navbar-actions button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.navbar-actions button:not(:disabled):hover {
  background-color: var(--hover);
  color: var(--text);
}

.navbar-actions button.loading {
  position: relative;
}

.navbar-actions button.loading::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  border: 2px solid transparent;
  border-top: 2px solid var(--text);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* 图片生成设置 */
.image-settings {
  display: none;
  padding: 12px 20px;
  background-color: var(--navbar);
  border-bottom: 1px solid var(--border);
  border-top: 1px solid var(--border);
}

.settings-content {
  max-width: 100%;
  display: flex;
  gap: 20px;
  align-items: center;
  flex-wrap: wrap;
}

.setting-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-secondary);
}

.setting-item select {
  padding: 4px 8px;
  border-radius: 4px;
  border: 1px solid var(--border);
  background-color: var(--card-bg);
  color: var(--text);
  font-size: 14px;
  outline: none;
  cursor: pointer;
}

/* 聊天容器 */
.chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 0 20px;
  overflow: hidden;
}

/* 聊天记录 */
.chat-history {
  flex: 1;
  padding: 20px 0;
  overflow-y: auto;
  scroll-behavior: smooth;
}

/* 滚动条美化 */
.chat-history::-webkit-scrollbar,
.conversation-list::-webkit-scrollbar {
  width: 6px;
}

.chat-history::-webkit-scrollbar-track,
.conversation-list::-webkit-scrollbar-track {
  background: transparent;
}

.chat-history::-webkit-scrollbar-thumb,
.conversation-list::-webkit-scrollbar-thumb {
  background-color: var(--border);
  border-radius: 3px;
}

.chat-history::-webkit-scrollbar-thumb:hover,
.conversation-list::-webkit-scrollbar-thumb:hover {
  background-color: var(--text-secondary);
}

/* 消息样式 */
.message {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
  max-width: 90%;
}

.user-message {
  flex-direction: row-reverse;
  margin-left: auto;
}

/* 头像 */
.avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--user-msg);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 16px;
}

.ai-message .avatar {
  background-color: var(--ai-msg);
  color: var(--text-secondary);
}

/* 消息内容容器 */
.message-content-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* 消息内容 */
.message-content {
  padding: 12px 16px;
  border-radius: 16px;
  white-space: pre-wrap;
  word-wrap: break-word;
  font-size: 15px;
  line-height: 1.6;
}

.user-message .message-content {
  background-color: var(--user-msg);
  color: white;
  border-bottom-right-radius: 4px;
}

.ai-message .message-content {
  background-color: var(--ai-msg);
  color: var(--text);
  border-bottom-left-radius: 4px;
}

/* 图片相关样式 */
.message-content.image-content {
  padding: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.image-wrapper {
  position: relative;
  display: inline-block;
}

.uploaded-image, .generated-image {
  max-width: 100%;
  max-height: 400px;
  border-radius: 8px;
  object-fit: contain;
  background-color: var(--hover);
  transition: transform 0.2s;
}

.uploaded-image:hover, .generated-image:hover {
  transform: scale(1.01);
}

.image-download-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: rgba(0,0,0,0.5);
  color: white;
  border: none;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: background-color 0.2s;
}

.image-wrapper:hover .image-download-btn,
.image-item:hover .image-download-btn {
  display: flex;
}

.image-download-btn:hover {
  background-color: var(--user-msg);
}

.image-prompt {
  font-size: 14px;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 8px;
}

.image-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 20px;
  color: var(--text-secondary);
  width: 100%;
}

.image-error {
  color: var(--toast-error);
  text-align: center;
  padding: 20px;
}

/* 图片网格 */
.images-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
  width: 100%;
  margin-bottom: 12px;
}

.image-item {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  background-color: var(--hover);
}

.image-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

/* 批量下载按钮 */
.batch-download-btn {
  padding: 8px 16px;
  border-radius: 8px;
  border: none;
  background-color: var(--user-msg);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  transition: background-color 0.2s;
  margin-top: 8px;
}

.batch-download-btn:hover {
  background-color: #0066cc;
}

/* 加载动画 */
.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border);
  border-top: 4px solid var(--user-msg);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* 加载中样式 */
.loading {
  color: var(--text-secondary);
  font-style: italic;
  display: inline-block;
  animation: blink 1.2s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* 输入框区域 */
.chat-input-wrapper {
  padding: 10px 0 20px;
  border-top: 1px solid var(--border);
}

.chat-input-container {
  position: relative;
  background-color: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 8px;
  display: flex;
  gap: 8px;
  align-items: center;
}

/* 图片上传按钮 */
.upload-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s, color 0.2s;
  flex-shrink: 0;
}

.upload-btn:hover {
  background-color: var(--hover);
  color: var(--user-msg);
}

#messageInput {
  flex: 1;
  border: none;
  outline: none;
  background-color: transparent;
  color: var(--text);
  padding: 8px 12px;
  font-size: 15px;
  resize: none;
  min-height: 20px;
  max-height: 120px;
}

#messageInput::placeholder {
  color: var(--text-secondary);
  opacity: 0.7;
}

#sendBtn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background-color: var(--user-msg);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: opacity 0.2s, background-color 0.2s;
}

#sendBtn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

#sendBtn:hover:not(:disabled) {
  background-color: #0066cc;
}

#sendBtn.sending {
  background-color: var(--text-secondary);
  position: relative;
}

#sendBtn.sending::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  border: 2px solid transparent;
  border-top: 2px solid white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/*