:root {
  /* 颜色变量 */
  --primary-color: #3498db;
  --primary-dark: #2980b9;
  --secondary-color: #2c3e50;
  --light-bg: #f5f7fa;
  --white: #ffffff;
  --gray-100: #f8f9fa;
  --gray-200: #e1e4e8;
  --gray-300: #bdc3c7;
  --gray-400: #7f8c8d;
  --gray-500: #6c757d;
  --error-color: #e74c3c;
  --success-color: #2ecc71;
  --warning-color: #f39c12;
  --text-color: #333;
  --text-light: #777;
  --text-secondary: #888;
  
  /* 文件历史相关变量 */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --border-color: #e1e4e8;
  --success-rgb: 46, 204, 113;
  --primary-rgb: 52, 152, 219;
  
  /* 尺寸变量 */
  --spacing-xs: 5px;
  --spacing-sm: 10px;
  --spacing-md: 15px;
  --spacing-lg: 20px;
  --spacing-xl: 30px;
  
  /* 圆角 */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 18px;
  --border-radius-round: 50%;
  
  /* 阴影 */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 2px 10px rgba(0, 0, 0, 0.2);
  
  /* 动画 */
  --transition-fast: 0.2s;
  --transition-normal: 0.3s;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  background-color: var(--light-bg);
  color: var(--text-color);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 头部样式 */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--gray-200);
  margin-bottom: var(--spacing-lg);
}

h1 {
  font-size: 1.5rem;
  font-weight: 600;
}

h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: 1rem;
  margin-bottom: var(--spacing-sm);
  color: var(--secondary-color);
  font-weight: 500;
}

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

/* 用户信息 */
.user-info {
  display: flex;
  align-items: center;
}

.avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-round);
  background-color: var(--primary-color);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin-right: var(--spacing-sm);
}

.name {
  font-weight: 500;
}

/* 主体内容 */
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Peers 列表 */
.peers-container {
  flex: 1;
  overflow: auto;
}

.peers-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: var(--spacing-md);
}

.peer-item {
  background-color: var(--white);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.peer-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.peer-item .avatar {
  width: 60px;
  height: 60px;
  margin-bottom: var(--spacing-sm);
  font-size: 1.25rem;
}

.no-peers {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--gray-400);
  font-style: italic;
}

/* 传输容器 */
.transfer-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: var(--white);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.selected-peer-info {
  display: flex;
  align-items: center;
  padding: var(--spacing-md);
  background-color: var(--gray-100);
  border-bottom: 1px solid var(--gray-200);
}

.back-button {
  font-size: 1.5rem;
  margin-right: var(--spacing-md);
  cursor: pointer;
  color: var(--gray-400);
  transition: color var(--transition-fast);
}

.back-button:hover {
  color: var(--secondary-color);
}

/* 标签页 */
.tabs {
  display: flex;
  border-bottom: 1px solid var(--gray-200);
  background-color: var(--white);
  position: sticky;
  top: 0;
  z-index: 10;
  padding: 0 var(--spacing-md);
}

.tab {
  padding: 1rem 1.5rem;
  cursor: pointer;
  border: none;
  background: none;
  color: var(--gray-500);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.tab::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--primary-color);
  transform: scaleX(0);
  transition: transform var(--transition-fast);
  transform-origin: left;
}

.tab:hover {
  color: var(--primary-color);
  background-color: var(--gray-100);
}

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

.tab.active::after {
  transform: scaleX(1);
}

.tab i {
  font-size: 1.1rem;
}

/* 标签内容 */
.tab-content {
  display: none;
  flex: 1;
  overflow: auto;
  padding: var(--spacing-lg);
  background-color: var(--white);
  border-radius: 0 0 var(--border-radius-md) var(--border-radius-md);
}

.tab-content.active {
  display: flex;
  flex-direction: column;
  animation: fadeIn var(--transition-normal);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 文件上传区域 */
.file-transfer-area {
  margin-bottom: var(--spacing-lg);
}

.file-drop-area {
  border: 2px dashed var(--gray-300);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-xl);
  text-align: center;
  margin-bottom: var(--spacing-md);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.file-drop-area.drag-over {
  border-color: var(--primary-color);
  background-color: rgba(52, 152, 219, 0.05);
}

.upload-options {
  display: flex;
  justify-content: center;
  gap: 0;
  background-color: var(--gray-100);
  padding: var(--spacing-sm);
  border-radius: var(--border-radius-md);
  width: fit-content;
  margin: 0 auto var(--spacing-md);
  position: relative;
}

.upload-options input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.upload-options label {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-weight: 500;
  color: var(--gray-500);
  background-color: var(--white);
  border: 1px solid var(--gray-300);
  min-width: 120px;
  justify-content: center;
  position: relative;
  z-index: 1;
}

.upload-options label:first-child {
  border-top-left-radius: var(--border-radius-sm);
  border-bottom-left-radius: var(--border-radius-sm);
  border-right: none;
}

.upload-options label:last-child {
  border-top-right-radius: var(--border-radius-sm);
  border-bottom-right-radius: var(--border-radius-sm);
  border-left: none;
}

.upload-options label i {
  font-size: 1.1rem;
  transition: transform var(--transition-fast);
}

.upload-options input[type="radio"]:checked + label {
  background-color: var(--primary-color);
  color: var(--white);
  border-color: var(--primary-color);
  box-shadow: var(--shadow-sm);
}

.upload-options input[type="radio"]:checked + label i {
  transform: scale(1.1);
}

.upload-options input[type="radio"]:not(:checked) + label:hover {
  background-color: var(--gray-100);
  color: var(--primary-color);
  border-color: var(--primary-color);
}

.file-input-container {
  position: relative;
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
}

.file-input-container input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.file-input-container input[type="file"]::-webkit-file-upload-button {
  visibility: hidden;
}

.file-input-container input[type="file"]::file-selector-button {
  visibility: hidden;
}

.file-input-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  padding: var(--spacing-xl);
  border: 2px dashed var(--gray-300);
  border-radius: var(--border-radius-md);
  transition: all var(--transition-fast);
  background-color: var(--white);
}

.file-input-label:hover {
  background-color: rgba(52, 152, 219, 0.05);
  border-color: var(--primary-color);
  transform: translateY(-2px);
}

.file-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  color: var(--gray-400);
  transition: color var(--transition-fast);
}

.file-input-label:hover .file-icon {
  color: var(--primary-color);
}

.file-text {
  color: var(--gray-500);
  font-size: 1.1rem;
  text-align: center;
  transition: color var(--transition-fast);
}

.file-input-label:hover .file-text {
  color: var(--primary-color);
}

.file-hint {
  color: var(--gray-400);
  font-size: 0.9rem;
  margin-top: var(--spacing-sm);
  opacity: 0;
  transform: translateY(10px);
  transition: all var(--transition-fast);
}

.file-input-label:hover .file-hint {
  opacity: 1;
  transform: translateY(0);
}

/* 按钮样式 */
.send-btn, .primary-btn {
  background-color: var(--primary-color);
  color: var(--white);
  border: none;
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--transition-fast);
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-sm);
}

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

.send-btn:disabled {
  background-color: var(--gray-300);
  cursor: not-allowed;
}

.send-btn:not(:disabled) {
  background-color: var(--primary-color);
  cursor: pointer;
}

/* 消息区域 */
.messages-area {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.messages-list {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-sm);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.message {
  max-width: 70%;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius-lg);
  position: relative;
  word-break: break-word;
  animation: fadeIn var(--transition-normal);
}

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

.message-received {
  align-self: flex-start;
  background-color: var(--gray-100);
  border-bottom-left-radius: var(--spacing-xs);
}

.message-sent {
  align-self: flex-end;
  background-color: #dcf8c6;
  border-bottom-right-radius: var(--spacing-xs);
}

.message-time {
  font-size: 0.6875rem;
  color: var(--gray-400);
  margin-top: var(--spacing-xs);
  text-align: right;
}

.message-input-area {
  background-color: var(--white);
  padding: var(--spacing-sm);
  box-shadow: 0 -2px 5px rgba(0, 0, 0, 0.05);
  display: flex;
  align-items: center;
  border-top: 1px solid var(--gray-200);
  gap: var(--spacing-sm);
}

#message-input {
  flex: 1;
  border: 1px solid var(--gray-200);
  border-radius: 20px;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.875rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

#message-input:focus {
  border-color: var(--primary-color);
}

#send-message-btn {
  background-color: var(--primary-color);
  color: var(--white);
  border: none;
  border-radius: var(--border-radius-round);
  width: 40px;
  height: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast);
  font-size: 1.25rem;
}

#send-message-btn:hover {
  background-color: var(--primary-dark);
}

/* 模态框 */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal);
}

.modal:not(.hidden) {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background-color: var(--white);
  border-radius: var(--border-radius-md);
  width: 90%;
  max-width: 600px;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px);
  transition: transform var(--transition-normal);
}

.modal:not(.hidden) .modal-content {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--gray-200);
}

.close-modal {
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--gray-400);
  transition: color var(--transition-fast);
}

.close-modal:hover {
  color: var(--secondary-color);
}

.modal-body {
  padding: var(--spacing-lg);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.file-preview-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 200px;
  max-height: 400px;
  overflow: auto;
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-sm);
  background-color: var(--gray-100);
}

.file-preview-container img {
  max-width: 100%;
  max-height: 380px;
  object-fit: contain;
}

.file-preview-container audio, 
.file-preview-container video {
  width: 100%;
}

.file-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.875rem;
  color: var(--gray-400);
}

.file-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: var(--spacing-md);
}

/* 提示框 */
#toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  max-width: 90%;
}

.toast-message {
  background-color: rgba(0, 0, 0, 0.8);
  color: white;
  padding: 10px 20px;
  border-radius: 5px;
  text-align: center;
  animation: fadeIn 0.3s ease-in-out;
  margin-bottom: 4px;
  max-width: 100%;
}

.toast-error {
  background-color: rgba(220, 53, 69, 0.9);
}

.fade-out {
  animation: fadeOut 0.3s ease-in-out forwards;
}

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

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

.hidden {
  display: none !important;
}

/* 响应式设计 */
@media (max-width: 768px) {
  :root {
    --spacing-lg: 15px;
    --spacing-xl: 20px;
  }
  
  .peers-list {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }
  
  .message {
    max-width: 85%;
  }
  
  .tab-content {
    padding: var(--spacing-md);
  }
  
  .file-drop-area {
    padding: var(--spacing-lg);
  }
  
  .tabs {
    padding: 0;
  }
  
  .tab {
    padding: 0.875rem 1rem;
    font-size: 0.9rem;
  }
  
  .upload-options {
    width: 100%;
    max-width: 300px;
    padding: var(--spacing-xs);
  }
  
  .upload-options label {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
    min-width: 100px;
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-md: 10px;
    --spacing-lg: 12px;
  }
  
  body {
    font-size: 14px;
  }
  
  .container {
    padding: var(--spacing-md);
  }
  
  header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }
  
  .header-right {
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }
  
  .language-selector {
    margin-right: 0;
  }
  
  .peers-list {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: var(--spacing-sm);
  }
  
  .file-drop-area {
    padding: var(--spacing-md);
  }
  
  .file-icon {
    font-size: 2rem;
  }
  
  .message-input-area {
    position: sticky;
    bottom: 0;
    background-color: var(--white);
    z-index: 2;
  }
  
  #send-message-btn {
    width: 36px;
    height: 36px;
  }
  
  .modal-content {
    width: 95%;
  }
  
  .upload-options {
    max-width: 100%;
    padding: var(--spacing-xs);
  }
  
  .upload-options label {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.85rem;
    min-width: 90px;
  }
  
  .upload-options label i {
    font-size: 0.9rem;
  }
  
  .tab {
    padding: 0.75rem 0.875rem;
    font-size: 0.85rem;
  }
  
  .tab i {
    font-size: 1rem;
  }
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
  :root {
    --light-bg: #121212;
    --white: #1e1e1e;
    --gray-100: #252525;
    --gray-200: #333;
    --gray-300: #444;
    --gray-400: #999;
    --text-color: #eee;
    --text-light: #bbb;
    --text-secondary: #999;
    --secondary-color: #a0c4ff;
    
    /* 文件历史暗色模式变量 */
    --bg-primary: #252525;
    --bg-secondary: #1e1e1e;
    --border-color: #333;
  }
  
  .peer-item {
    background-color: #252525;
  }
  
  .message-sent {
    background-color: #0d47a1;
    color: white;
  }
  
  .message-received {
    background-color: #333;
    color: #eee;
  }
  
  #message-input {
    background-color: #252525;
    color: #eee;
  }
  
  .file-preview-container {
    background-color: #252525;
  }
  
  /* 适应暗色模式的其他调整 */
  .file-drop-area, .file-input-label {
    border-color: #444;
  }
  
  .file-input-label:hover {
    background-color: rgba(52, 152, 219, 0.1);
  }
  
  .upload-options {
    background-color: var(--gray-200);
  }
  
  .upload-options label {
    background-color: var(--gray-100);
    border-color: var(--gray-300);
    color: var(--gray-400);
  }
  
  .upload-options input[type="radio"]:checked + label {
    background-color: var(--secondary-color);
    color: var(--white);
    border-color: var(--secondary-color);
  }
  
  .upload-options input[type="radio"]:not(:checked) + label:hover {
    background-color: var(--gray-200);
    color: var(--secondary-color);
    border-color: var(--secondary-color);
  }
  
  .file-hint {
    color: var(--gray-500);
  }
  
  .tabs {
    background-color: var(--gray-100);
  }
  
  .tab {
    color: var(--gray-400);
  }
  
  .tab:hover {
    background-color: var(--gray-200);
  }
  
  .tab.active {
    color: var(--secondary-color);
  }
  
  .tab-content {
    background-color: var(--gray-100);
  }
}

/* 文件列表样式 */
.file-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
  max-height: 300px;
  overflow-y: auto;
  padding-right: var(--spacing-sm);
}

.file-list::-webkit-scrollbar {
  width: 6px;
}

.file-list::-webkit-scrollbar-track {
  background: var(--gray-100);
  border-radius: 3px;
}

.file-list::-webkit-scrollbar-thumb {
  background: var(--gray-300);
  border-radius: 3px;
}

.file-list::-webkit-scrollbar-thumb:hover {
  background: var(--gray-400);
}

.file-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background-color: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
}

.file-item:hover {
  background-color: var(--gray-100);
  border-color: var(--gray-300);
  transform: translateX(2px);
}

.file-item .file-icon {
  font-size: 1.2rem;
  color: var(--gray-400);
  width: 24px;
  text-align: center;
}

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

.file-item .file-name {
  font-size: 0.9rem;
  color: var(--text-color);
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-item .file-size {
  font-size: 0.8rem;
  color: var(--gray-400);
}

.file-item .remove-file {
  color: var(--gray-400);
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  opacity: 0;
}

.file-item:hover .remove-file {
  opacity: 1;
}

.file-item .remove-file:hover {
  color: var(--error-color);
  background-color: rgba(231, 76, 60, 0.1);
}

/* 文件类型图标颜色 */
.file-item .fa-file-alt { color: #3498db; }
.file-item .fa-file-image { color: #2ecc71; }
.file-item .fa-file-video { color: #e74c3c; }
.file-item .fa-file-audio { color: #f39c12; }
.file-item .fa-file-pdf { color: #e74c3c; }
.file-item .fa-file-word { color: #3498db; }
.file-item .fa-file-excel { color: #2ecc71; }
.file-item .fa-file-powerpoint { color: #f39c12; }
.file-item .fa-file-archive { color: #9b59b6; }

/* 响应式调整 */
@media (max-width: 768px) {
  .file-list {
    max-height: 250px;
  }
  
  .file-item {
    padding: var(--spacing-xs) var(--spacing-sm);
  }
  
  .file-item .file-icon {
    font-size: 1.1rem;
  }
  
  .file-item .file-name {
    font-size: 0.85rem;
  }
  
  .file-item .file-size {
    font-size: 0.75rem;
  }
}

@media (max-width: 480px) {
  .file-list {
    max-height: 200px;
  }
  
  .file-item {
    padding: var(--spacing-xs);
  }
  
  .file-item .file-icon {
    font-size: 1rem;
  }
  
  .file-item .file-name {
    font-size: 0.8rem;
  }
  
  .file-item .file-size {
    font-size: 0.7rem;
  }
  
  .file-item .remove-file {
    opacity: 1;
    padding: var(--spacing-xs);
  }
}

/* 暗色模式适配 */
@media (prefers-color-scheme: dark) {
  .file-list::-webkit-scrollbar-track {
    background: var(--gray-200);
  }
  
  .file-list::-webkit-scrollbar-thumb {
    background: var(--gray-400);
  }
  
  .file-list::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
  }
  
  .file-item {
    background-color: var(--gray-100);
    border-color: var(--gray-300);
  }
  
  .file-item:hover {
    background-color: var(--gray-200);
    border-color: var(--gray-400);
  }
  
  .file-item .file-name {
    color: var(--text-color);
  }
  
  .file-item .file-size {
    color: var(--gray-500);
  }
  
  .file-item .remove-file {
    color: var(--gray-500);
  }
  
  .file-item .remove-file:hover {
    background-color: rgba(231, 76, 60, 0.2);
  }
}

/* 文件历史样式 */
.file-history {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  background: var(--bg-secondary);
  border-radius: 8px;
  margin-top: 1rem;
}

.empty-history {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-secondary);
  padding: 2rem;
  text-align: center;
}

.empty-history i {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.history-item {
  background: var(--bg-primary);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 0.75rem;
  transition: all 0.2s ease;
  border: 1px solid var(--border-color);
}

.history-item.sent {
  border-left: 3px solid var(--success-color);
}

.history-item.received {
  border-left: 3px solid var(--primary-color);
}

.history-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.history-item-content {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.file-icon-wrapper {
  width: 40px;
  height: 40px;
  min-width: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border-radius: 8px;
  color: var(--primary-color);
  font-size: 1.25rem;
}

.file-info {
  flex: 1;
  min-width: 0;
  max-width: calc(100% - 150px);
  overflow: hidden;
}

.file-name {
  font-weight: 500;
  margin-bottom: 0.2rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

.file-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-light);
  font-size: 0.85rem;
  flex-wrap: wrap;
}

.file-direction {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
}

.file-direction.sent {
  background: rgba(var(--success-rgb), 0.1);
  color: var(--success-color);
}

.file-direction.received {
  background: rgba(var(--primary-rgb), 0.1);
  color: var(--primary-color);
}

.file-actions {
  display: flex;
  gap: 0.5rem;
  min-width: 80px;
  flex-shrink: 0;
  justify-content: flex-end;
}

.action-btn {
  background: none;
  border: none;
  padding: 0.5rem;
  border-radius: 4px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.action-btn i {
  font-size: 1rem;
}

/* 移动端适配 */
@media (max-width: 768px) {
  .file-history {
    padding: 0.75rem;
  }

  .history-item {
    padding: 0.75rem;
  }

  .history-item-content {
    gap: 0.75rem;
    align-items: center;
  }

  .file-icon-wrapper {
    width: 32px;
    height: 32px;
    min-width: 32px;
    font-size: 1rem;
  }

  .file-info {
    max-width: calc(100% - 110px);
  }

  .file-name {
    max-width: 100%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: 500;
    margin-bottom: 0.15rem;
  }

  .file-meta {
    gap: 0.5rem;
    flex-wrap: wrap;
  }

  .file-date {
    display: none;
  }

  .file-direction {
    padding: 0.2rem 0.4rem;
  }

  .file-actions {
    min-width: 70px;
    flex-shrink: 0;
    justify-content: flex-end;
  }

  .action-btn {
    padding: 0.4rem;
  }
}

@media (max-width: 480px) {
  .file-history {
    padding: 0.5rem;
  }

  .history-item {
    padding: 0.5rem;
    margin-bottom: 0.5rem;
  }

  .history-item.sent {
    border-left-width: 2px;
  }
  
  .history-item.received {
    border-left-width: 2px;
  }

  .history-item-content {
    gap: 0.5rem;
    display: flex;
    align-items: center;
  }

  .file-icon-wrapper {
    width: 28px;
    height: 28px;
    min-width: 28px;
    font-size: 0.9rem;
  }

  .file-info {
    max-width: calc(100% - 90px);
  }

  .file-name {
    max-width: 100%;
    font-size: 0.9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 0.1rem;
  }

  .file-meta {
    font-size: 0.8rem;
    flex-wrap: wrap;
    gap: 0.4rem;
  }

  .file-direction {
    font-size: 0.7rem;
    padding: 0.15rem 0.3rem;
  }

  .file-actions {
    min-width: 60px;
    flex-shrink: 0;
    justify-content: flex-end;
    display: flex;
    gap: 0.3rem;
  }

  .action-btn {
    padding: 0.3rem;
  }

  .action-btn i {
    font-size: 0.9rem;
  }

  .empty-history i {
    font-size: 2.5rem;
  }

  .empty-history p {
    font-size: 0.9rem;
  }
}

@media (prefers-color-scheme: dark) {
  .file-direction.sent {
    background: rgba(var(--success-rgb), 0.2);
    color: var(--success-color);
  }
  
  .file-direction.received {
    background: rgba(var(--primary-rgb), 0.2);
    color: var(--primary-color);
  }
}

/* 连接状态图标 */
.connection-status {
  display: flex;
  align-items: center;
  margin-bottom: 1rem;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  font-weight: 500;
  background-color: var(--bg-secondary);
  color: var(--text-color);
}

.status-icon {
  margin-right: 0.5rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  display: inline-flex;
  justify-content: center;
  align-items: center;
}

.status-icon.connecting {
  background-color: var(--warning-color);
  position: relative;
  animation: pulse 1.5s infinite;
}

.status-icon.connecting::before {
  content: "";
  width: 6px;
  height: 6px;
  background-color: white;
  border-radius: 50%;
}

.status-icon.connected {
  background-color: var(--success-color);
  position: relative;
}

.status-icon.connected::before {
  content: "✓";
  color: white;
  font-size: 10px;
  font-weight: bold;
}

.status-icon.disconnected {
  background-color: var(--error-color);
  position: relative;
}

.status-icon.disconnected::before {
  content: "×";
  color: white;
  font-size: 12px;
  font-weight: bold;
}

.status-icon.unknown {
  background-color: var(--gray-400);
  position: relative;
}

.status-icon.unknown::before {
  content: "?";
  color: white;
  font-size: 10px;
  font-weight: bold;
}

@keyframes pulse {
  0% { opacity: 0.6; }
  50% { opacity: 1; }
  100% { opacity: 0.6; }
}

/* Add CSS for transfer progress display */
.transfer-progress-container {
    margin: 15px 0;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    display: none; /* Hidden by default, shown when transfers start */
}

.transfer-progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--light-bg);
    padding: 8px 15px;
    border-bottom: 1px solid var(--border-color);
}

.transfer-progress-header h4 {
    margin: 0;
    font-size: 14px;
    color: var(--text-color);
}

.minimize-progress {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    padding: 0;
    font-size: 14px;
}

.minimize-progress:hover {
    color: var(--text-color);
}

.transfer-progress-content {
    padding: 10px 15px;
    max-height: 250px;
    overflow-y: auto;
}

.transfer-progress-item {
    margin-bottom: 12px;
}

.transfer-progress-title {
    display: flex;
    justify-content: space-between;
    margin-bottom: 5px;
    font-size: 13px;
}

.transfer-progress-filename {
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 70%;
}

.transfer-progress-status {
    font-size: 12px;
    color: var(--text-muted);
}

.transfer-progress-bar-container {
    width: 100%;
    height: 8px;
    background-color: var(--light-bg);
    border-radius: 4px;
    overflow: hidden;
}

.transfer-progress-bar {
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.transfer-progress-bar.complete {
    background-color: var(--success-color);
}

.transfer-progress-bar.error {
    background-color: var(--error-color);
}

.transfer-progress-summary {
    margin-top: 15px;
    padding-top: 10px;
    border-top: 1px solid var(--border-color);
    font-size: 13px;
    color: var(--text-color);
}

/* Show minimized view when class is applied */
.transfer-progress-container.minimized .transfer-progress-content {
    display: none;
}

.transfer-progress-container.minimized .minimize-progress i {
    transform: rotate(180deg);
}