* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-bg: #F5F5F0;
  --color-bg-light: #FAFAF8;
  --color-bg-card: #FFFFFF;
  --color-border: #E5E5E0;
  --color-text: #2C2C2E;
  --color-text-secondary: #6C6C70;
  --color-text-tertiary: #A8A8AC;
  --color-primary: #2C2C2E;
  --color-primary-hover: #3E3E42;
  --color-ai: #8B7355;
  --color-user: #5A7D6E;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

/* 登录界面 */
.login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-light) 100%);
}

.login-container {
  background: var(--color-bg-card);
  padding: 40px;
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  width: 90%;
  max-width: 400px;
}

.login-title {
  text-align: center;
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 32px;
  color: var(--color-text);
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.login-btn {
  width: 100%;
  padding: 14px;
  font-size: 15px;
  margin-top: 8px;
}

.app-container {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* 侧边栏 */
.sidebar {
  width: 300px;
  background: var(--color-bg-card);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--color-border);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: var(--color-bg);
  border-radius: 8px;
  margin-bottom: 16px;
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-user);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 16px;
  flex-shrink: 0;
}

.user-details {
  flex: 1;
  min-width: 0;
}

.user-name {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.logout-btn {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: 12px;
  cursor: pointer;
  padding: 0;
  transition: color 0.2s;
}

.logout-btn:hover {
  color: var(--color-text);
}

.app-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-text);
}

.new-group-btn {
  width: 100%;
  padding: 12px;
  background: var(--color-primary);
  color: var(--color-bg-card);
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

.new-group-btn:hover {
  background: var(--color-primary-hover);
}

.admin-panel-btn {
  width: 100%;
  padding: 12px;
  margin-top: 8px;
  background: var(--color-ai);
  color: var(--color-bg-card);
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.2s;
}

.admin-panel-btn:hover {
  opacity: 0.9;
}

.group-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.group-item {
  padding: 16px;
  margin-bottom: 4px;
  background: var(--color-bg);
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.group-item:hover {
  background: var(--color-bg-light);
  border-color: var(--color-border);
}

.group-item.active {
  background: var(--color-bg-light);
  border-color: var(--color-primary);
}

.group-item-name {
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 4px;
  color: var(--color-text);
}

.group-item-preview {
  font-size: 13px;
  color: var(--color-text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 聊天区域 */
.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--color-bg-light);
}

.welcome-screen {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.welcome-content {
  text-align: center;
  color: var(--color-text-secondary);
}

.welcome-content h2 {
  font-size: 24px;
  margin-bottom: 12px;
  color: var(--color-text);
}

.chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.chat-header {
  padding: 16px 20px;
  background: var(--color-bg-card);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 12px;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--color-text);
  padding: 4px;
}

.chat-header-info {
  flex: 1;
}

.group-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 2px;
}

.member-count {
  font-size: 12px;
  color: var(--color-text-secondary);
}

.manage-members-btn {
  padding: 8px 16px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}

.manage-members-btn:hover {
  background: var(--color-bg-light);
  border-color: var(--color-primary);
}

/* 消息列表 */
.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}

.messages-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.message {
  display: flex;
  gap: 12px;
  animation: messageSlideIn 0.3s ease;
}

@keyframes messageSlideIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 14px;
  flex-shrink: 0;
  border: 2px solid var(--color-border);
}

.message-avatar.ai {
  background: var(--color-ai);
  color: white;
  border-color: var(--color-ai);
}

.message-avatar.user {
  background: var(--color-user);
  color: white;
  border-color: var(--color-user);
}

.message-content {
  flex: 1;
}

.message-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.message-sender {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.ai-badge {
  padding: 2px 6px;
  background: var(--color-ai);
  color: white;
  font-size: 11px;
  border-radius: 4px;
  font-weight: 500;
}

.message-time {
  font-size: 12px;
  color: var(--color-text-tertiary);
}

.message-text {
  background: var(--color-bg-card);
  padding: 12px 16px;
  border-radius: 12px;
  font-size: 14px;
  line-height: 1.5;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  white-space: pre-wrap;
  word-wrap: break-word;
}

/* 输入区域 */
.input-area {
  padding: 16px 20px;
  background: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
}

.input-toolbar {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
}

.toolbar-btn {
  padding: 6px 12px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 16px;
  cursor: pointer;
  transition: all 0.2s;
}

.toolbar-btn:hover {
  background: var(--color-bg-light);
  border-color: var(--color-primary);
}

.reply-preview {
  padding: 8px 12px;
  background: var(--color-bg);
  border-left: 3px solid var(--color-primary);
  border-radius: 4px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--color-text-secondary);
}

.reply-cancel {
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--color-text-secondary);
  padding: 0;
  line-height: 1;
}

.reply-cancel:hover {
  color: var(--color-text);
}

.input-area > div:last-of-type {
  display: flex;
  gap: 12px;
}

.message-input {
  flex: 1;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  resize: none;
  max-height: 120px;
  background: var(--color-bg-light);
  transition: border-color 0.2s;
}

.message-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.send-btn {
  padding: 12px 24px;
  background: var(--color-primary);
  color: var(--color-bg-card);
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

.send-btn:hover {
  background: var(--color-primary-hover);
}

.send-btn:disabled {
  background: var(--color-text-tertiary);
  cursor: not-allowed;
}

/* 模态框 */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s;
}

.modal.show {
  display: flex;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.modal-content {
  background: var(--color-bg-card);
  border-radius: 12px;
  width: 90%;
  max-width: 500px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.3s;
}

@keyframes slideUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-header {
  padding: 20px;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 18px;
  font-weight: 600;
}

.close-btn {
  background: none;
  border: none;
  font-size: 28px;
  cursor: pointer;
  color: var(--color-text-secondary);
  line-height: 1;
  padding: 0;
  width: 32px;
  height: 32px;
}

.close-btn:hover {
  color: var(--color-text);
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  background: var(--color-bg-light);
  transition: border-color 0.2s;
}

.form-group input[type="text"]:focus,
.form-group input[type="password"]:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
}

.user-selection {
  max-height: 200px;
  overflow-y: auto;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 8px;
  background: var(--color-bg-light);
}

.user-checkbox {
  display: flex;
  align-items: center;
  padding: 8px;
  margin-bottom: 4px;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s;
}

.user-checkbox:hover {
  background: var(--color-bg);
}

.user-checkbox input[type="checkbox"] {
  margin-right: 10px;
  cursor: pointer;
}

.user-checkbox label {
  cursor: pointer;
  flex: 1;
  margin: 0;
  font-weight: 400;
}

.ai-member-form {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.ai-member-form input {
  flex: 1;
}

.ai-member-form select {
  width: auto;
}

.add-ai-btn {
  padding: 10px 16px;
  background: var(--color-primary);
  color: var(--color-bg-card);
  border: none;
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s;
}

.add-ai-btn:hover {
  background: var(--color-primary-hover);
}

.added-ai-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.ai-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--color-ai);
  color: white;
  border-radius: 16px;
  font-size: 13px;
}

.ai-tag-remove {
  background: none;
  border: none;
  color: white;
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  padding: 0;
}

.btn-primary,
.btn-secondary {
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-bg-card);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
}

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-bg-light);
}

.member-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  margin-bottom: 8px;
  background: var(--color-bg);
  border-radius: 8px;
}

.member-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 16px;
  border: 2px solid var(--color-border);
}

.member-avatar.ai {
  background: var(--color-ai);
  color: white;
  border-color: var(--color-ai);
}

.member-avatar.user {
  background: var(--color-user);
  color: white;
  border-color: var(--color-user);
}

.member-info {
  flex: 1;
}

.member-name {
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 2px;
}

.member-type {
  font-size: 12px;
  color: var(--color-text-secondary);
}

/* 表情选择器 */
.emoji-picker {
  position: absolute;
  bottom: 80px;
  left: 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 12px;
  box-shadow: var(--shadow-lg);
  z-index: 100;
}

.emoji-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 4px;
  max-width: 320px;
}

.emoji-item {
  padding: 8px;
  font-size: 24px;
  cursor: pointer;
  border-radius: 4px;
  text-align: center;
  transition: background 0.2s;
}

.emoji-item:hover {
  background: var(--color-bg);
}

/* @提醒选择器 */
.mention-picker {
  position: absolute;
  bottom: 80px;
  left: 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  z-index: 100;
  max-width: 300px;
  max-height: 200px;
  overflow-y: auto;
}

.mention-list {
  padding: 4px;
}

.mention-item {
  padding: 10px 12px;
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.2s;
  font-size: 14px;
}

.mention-item:hover {
  background: var(--color-bg);
}

/* 管理员面板 */
.admin-panel {
  max-width: 600px;
}

.admin-section {
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.admin-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.admin-section h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-text);
}

.admin-users-list {
  max-height: 300px;
  overflow-y: auto;
}

.admin-user-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px;
  background: var(--color-bg);
  border-radius: 8px;
  margin-bottom: 8px;
}

.admin-user-info {
  flex: 1;
}

.admin-user-name {
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 2px;
}

.admin-user-username {
  font-size: 12px;
  color: var(--color-text-secondary);
}

.admin-user-badge {
  padding: 2px 8px;
  background: var(--color-ai);
  color: white;
  font-size: 11px;
  border-radius: 4px;
  margin-left: 8px;
}

.delete-user-btn {
  padding: 6px 12px;
  background: #d9534f;
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  transition: opacity 0.2s;
}

.delete-user-btn:hover {
  opacity: 0.9;
}

/* 管理员标签页 */
.admin-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  border-bottom: 2px solid var(--color-border);
}

.admin-tab {
  padding: 12px 20px;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: all 0.2s;
}

.admin-tab:hover {
  color: var(--color-text);
  background: var(--color-bg);
}

.admin-tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.admin-tab-content {
  display: none;
}

.admin-tab-content.active {
  display: block;
}

/* AI 配置列表 */
.ai-config-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.ai-config-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 16px;
}

.ai-config-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.ai-config-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--color-ai);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 18px;
  flex-shrink: 0;
  border: 2px solid var(--color-border);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.ai-config-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.ai-config-avatar:hover::after {
  content: '📷';
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.ai-config-info {
  flex: 1;
}

.ai-config-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.ai-config-model {
  font-size: 12px;
  color: var(--color-text-secondary);
}

.ai-config-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.ai-config-body textarea {
  grid-column: 1 / -1;
  min-height: 100px;
  padding: 12px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 13px;
  font-family: inherit;
  resize: vertical;
  background: var(--color-bg-light);
}

.ai-config-actions {
  grid-column: 1 / -1;
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

@media (max-width: 768px) {
  .ai-config-body {
    grid-template-columns: 1fr;
  }
}

/* 响应式设计 */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 100;
    transform: translateX(-100%);
  }

  .sidebar.show {
    transform: translateX(0);
    box-shadow: var(--shadow-lg);
  }

  .menu-toggle {
    display: block;
  }

  .chat-header {
    padding: 12px 16px;
  }

  .messages-container {
    padding: 16px;
  }

  .input-area {
    padding: 12px 16px;
  }

  .modal-content {
    width: 95%;
    max-height: 90vh;
  }
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-tertiary);
}