/* ==================== 全局变量（类似 ST-Platform） ==================== */

:root {
  /* 背景色 */
  --bg-primary: #0F1419;
  --bg-secondary: #16181C;
  --bg-tertiary: #1C1F26;
  --bg-hover: #1E2126;
  --bg-header: rgba(15, 20, 25, 0.85);
  --bg-outer: #000000;
  
  /* 文字色 */
  --text-primary: #E7E9EA;
  --text-secondary: #71767B;
  --text-tertiary: #8B8F94;
  
  /* 主色调 */
  --primary-color: #1D9BF0;
  --primary-hover: #1A8CD8;
  --primary-dark: #1570B3;
  
  /* 状态色 */
  --success: #00BA7C;
  --danger: #F4212E;
  --warning: #FFB020;
  --online: #00BA7C;
  
  /* 边框色 */
  --border-color: #2F3336;
  --border-hover: #3E4347;
  
  /* 间距 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  
  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  
  /* 高度 */
  --header-height: 60px;
}

/* ==================== 全局样式 ==================== */

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-outer);
  color: var(--text-primary);
  font-size: 15px;
  line-height: 1.5;
  overflow: hidden;
}

/* ==================== 聊天应用容器 ==================== */

.chat-app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100%;
}

/* ==================== 顶部导航栏 ==================== */

.chat-header {
  height: var(--header-height);
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-lg);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.header-logo {
  font-size: 28px;
  color: var(--primary-color);
}

.header-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.user-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.username {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
}

/* ==================== 按钮 ==================== */

.btn {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-full);
  border: none;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  transition: all 0.2s ease;
}

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

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

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

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

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-outline:hover {
  background-color: var(--bg-hover);
  border-color: var(--border-hover);
}

.btn-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: none;
  background-color: transparent;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

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

.btn-close {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  border: none;
  background-color: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

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

.btn-text {
  display: inline;
}

@media (max-width: 768px) {
  .btn-text {
    display: none;
  }
}

/* ==================== 主体容器 ==================== */

.chat-main-container {
  display: flex;
  height: calc(100vh - var(--header-height));
  overflow: hidden;
}

/* ==================== 左侧边栏 ==================== */

.chat-sidebar {
  width: 360px;
  background-color: var(--bg-primary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

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

.sidebar-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

/* 搜索框 */
.search-box {
  padding: var(--spacing-md) var(--spacing-lg);
  position: relative;
}

.search-icon {
  position: absolute;
  left: 32px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  font-size: 14px;
}

.search-input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) 32px;
  background-color: var(--bg-tertiary);
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: all 0.2s ease;
}

.search-input:focus {
  background-color: var(--bg-secondary);
  border-color: var(--primary-color);
}

.search-input::placeholder {
  color: var(--text-secondary);
}

/* 在线用户区域 */
.online-section {
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.section-header:hover {
  background-color: var(--bg-hover);
}

.section-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.online-dot {
  font-size: 8px;
  color: var(--online);
}

.count-badge {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
}

.toggle-icon {
  font-size: 12px;
  color: var(--text-secondary);
  transition: transform 0.2s ease;
}

.toggle-icon.rotated {
  transform: rotate(180deg);
}

.online-users-list {
  max-height: 200px;
  overflow-y: auto;
}

.online-user-item {
  padding: var(--spacing-sm) var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  cursor: pointer;
  transition: background-color 0.2s ease;
}

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

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

.user-avatar img {
  width: 100%;
  height: 100%;
  border-radius: var(--radius-full);
  object-fit: cover;
}

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

.user-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

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

/* 聊天室列表 */
.chat-rooms-section {
  flex: 1;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--bg-tertiary) transparent;
}

.chat-rooms-section::-webkit-scrollbar {
  width: 6px;
}

.chat-rooms-section::-webkit-scrollbar-thumb {
  background-color: var(--bg-tertiary);
  border-radius: 3px;
}

.chat-rooms-list {
  padding-bottom: var(--spacing-lg);
}

.chat-room-item {
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  cursor: pointer;
  transition: background-color 0.2s ease;
  border-left: 3px solid transparent;
}

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

.chat-room-item.active {
  background-color: var(--bg-tertiary);
  border-left-color: var(--primary-color);
}

.room-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background-color: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 20px;
  flex-shrink: 0;
}

.room-info {
  flex: 1;
  min-width: 0;
}

.room-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-xs);
}

.room-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.room-time {
  font-size: 12px;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.room-message {
  font-size: 14px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.unread-badge {
  background-color: var(--primary-color);
  color: white;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  flex-shrink: 0;
}

/* 空状态 */
.empty-state {
  padding: var(--spacing-xl);
  text-align: center;
}

.empty-icon {
  font-size: 48px;
  color: var(--text-tertiary);
  margin-bottom: var(--spacing-md);
}

.empty-text {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

/* ==================== 右侧聊天内容 ==================== */

.chat-content {
  flex: 1;
  background-color: var(--bg-primary);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#chatWindowContainer {
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* 空聊天状态 */
.empty-chat-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
}

.empty-chat-icon {
  font-size: 80px;
  color: var(--text-tertiary);
  margin-bottom: var(--spacing-lg);
}

.empty-chat-title {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.empty-chat-text {
  font-size: 16px;
  color: var(--text-secondary);
}

/* ==================== 聊天窗口 ==================== */

.chat-window {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.chat-window-header {
  padding: var(--spacing-lg);
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.chat-window-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.chat-window-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.chat-window-subtitle {
  font-size: 13px;
  color: var(--text-secondary);
}

.chat-window-actions {
  display: flex;
  gap: var(--spacing-sm);
}

/* 消息区域 */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  scrollbar-width: thin;
  scrollbar-color: var(--bg-tertiary) transparent;
}

.chat-messages::-webkit-scrollbar {
  width: 6px;
}

.chat-messages::-webkit-scrollbar-thumb {
  background-color: var(--bg-tertiary);
  border-radius: 3px;
}

/* 消息项 */
.message-item {
  display: flex;
  gap: var(--spacing-md);
  animation: slideIn 0.2s ease;
}

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

.message-item.own {
  flex-direction: row-reverse;
}

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

.message-content {
  max-width: 60%;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.message-item.own .message-content {
  align-items: flex-end;
}

.message-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.message-username {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

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

.message-bubble {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-lg);
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.5;
  word-wrap: break-word;
}

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

/* 文件消息 */
.message-file {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  background-color: var(--bg-secondary);
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.message-file:hover {
  background-color: var(--bg-hover);
}

.file-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--primary-color);
}

.file-info {
  flex: 1;
}

.file-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 2px;
}

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

/* 输入区域 */
.chat-input-area {
  padding: var(--spacing-lg);
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-color);
}

.input-toolbar {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.toolbar-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: none;
  background-color: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

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

.input-container {
  display: flex;
  gap: var(--spacing-sm);
  align-items: flex-end;
}

.message-input {
  flex: 1;
  min-height: 44px;
  max-height: 120px;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--bg-secondary);
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  resize: none;
  outline: none;
  transition: all 0.2s ease;
}

.message-input:focus {
  background-color: var(--bg-tertiary);
  border-color: var(--primary-color);
}

.message-input::placeholder {
  color: var(--text-secondary);
}

.send-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  border: none;
  background-color: var(--primary-color);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.send-btn:hover {
  background-color: var(--primary-hover);
  transform: scale(1.05);
}

.send-btn:disabled {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  cursor: not-allowed;
  transform: none;
}

/* 正在输入指示器 */
.typing-indicator {
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 13px;
  color: var(--text-secondary);
  font-style: italic;
}

.typing-dots {
  display: inline-block;
}

.typing-dots span {
  animation: blink 1.4s infinite;
}

.typing-dots span:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-dots span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes blink {
  0%, 60%, 100% {
    opacity: 0;
  }
  30% {
    opacity: 1;
  }
}

/* ==================== 对话框 ==================== */

.dialog-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.2s ease;
}

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

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

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.dialog-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.dialog-body {
  padding: var(--spacing-lg);
  overflow-y: auto;
  flex: 1;
}

.dialog-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
}

/* 表单 */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.form-control {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--bg-tertiary);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: all 0.2s ease;
}

.form-control:focus {
  background-color: var(--bg-hover);
  border-color: var(--primary-color);
}

.user-selection-list {
  max-height: 300px;
  overflow-y: auto;
}

.user-select-item {
  padding: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: background-color 0.2s ease;
}

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

.user-select-item.selected {
  background-color: var(--bg-tertiary);
}

.user-checkbox {
  width: 20px;
  height: 20px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.user-select-item.selected .user-checkbox {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
}

.user-checkbox i {
  font-size: 12px;
  color: white;
  display: none;
}

.user-select-item.selected .user-checkbox i {
  display: block;
}

/* ==================== 响应式 ==================== */

@media (max-width: 768px) {
  /* 聊天室 sidebar 全寬覆蓋 */
  .chat-sidebar {
    width: 100%;
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 50;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
  }

  .chat-sidebar.mobile-show {
    transform: translateX(0);
  }

  /* 聊天室列表項目觸控目標 */
  .chat-room-item {
    min-height: 64px;
    padding: var(--spacing-md) var(--spacing-md);
  }

  .online-user-item {
    min-height: 52px;
  }

  /* 聊天主容器佔滿高度 */
  .chat-main-container {
    height: calc(100vh - var(--header-height));
    position: relative;
  }

  /* 聊天內容區佔滿寬度 */
  .chat-content {
    width: 100%;
    position: relative;
  }

  /* 訊息區底部留空間給固定輸入框 */
  .chat-messages {
    padding-bottom: 140px;
  }

  /* 訊息泡泡字體 */
  .message-bubble {
    font-size: 15px;
    padding: var(--spacing-sm) var(--spacing-md);
  }

  /* 訊息寬度 */
  .message-content {
    max-width: 80%;
  }

  /* 輸入框固定在底部，為底部導航留空間 */
  .chat-input-area {
    position: fixed;
    bottom: calc(64px + env(safe-area-inset-bottom));
    left: 0;
    right: 0;
    z-index: 99;
    padding: var(--spacing-md);
  }

  /* 聊天視窗標題欄的返回按鈕 */
  .chat-window-header {
    padding: var(--spacing-md);
    min-height: 56px;
  }

  .chat-window-header .btn-icon {
    min-height: 44px;
    min-width: 44px;
  }

  /* 聊天室頂部標題欄 */
  .chat-header {
    padding: 0 var(--spacing-md);
  }

  /* 整體 app 底部留空間 */
  .chat-app-container {
    padding-bottom: 0;
  }

  /* 底部底部導航空間 */
  .chat-rooms-section {
    padding-bottom: calc(64px + env(safe-area-inset-bottom));
  }
}

/* ==================== 工具类 ==================== */

.me-1 {
  margin-right: 4px;
}

.hidden {
  display: none !important;
}

.text-center {
  text-align: center;
}