/* 强制禁用移动端响应式样式 */
@media (max-width: 768px) {
    .container {
        flex-direction: row !important;
    }

    .sidebar {
        width: 250px !important;
        position: relative !important;
        top: auto !important;
        left: auto !important;
        transform: none !important;
        opacity: 1 !important;
        pointer-events: auto !important;
        border-right: 1px solid #ddd !important;
        border-bottom: none !important;
        max-height: none !important;
    }

    .sidebar.collapsed {
        width: 50px !important;
        padding: 10px !important;
        transform: none !important;
        opacity: 1 !important;
        pointer-events: auto !important;
    }

    .message {
        max-width: 80% !important;
    }

    .message.own-message {
        max-width: 80% !important;
        margin-left: 20% !important;
    }

    .upload-text {
        display: inline !important;
    }

    .chat-main {
        margin-top: 0 !important;
    }

    /* 恢复电脑端消息时间显示位置 */
    .message-time {
        position: absolute !important;
        right: 15px !important;
        bottom: 5px !important;
        display: block !important;
        text-align: right !important;
        margin-top: 0 !important;
    }
}

/* 基础样式 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* 定义CSS变量，便于主题切换 */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-message: #ffffff;
    --bg-message-own: #dcf8c6;
    --bg-header: #2c3e50;
    --bg-input: white;
    --text-primary: #333;
    --text-secondary: #6c757d;
    --border-color: #ddd;
    --shadow-color: rgba(0,0,0,0.1);
    --link-color: #07c160;
}

/* 深色主题变量 */
.dark-mode {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-message: #3a3a3a;
    --bg-message-own: #4c6b41;
    --bg-header: #1e293b;
    --bg-input: #2d2d2d;
    --text-primary: #f0f0f0;
    --text-secondary: #a0a0a0;
    --border-color: #404040;
    --shadow-color: rgba(0,0,0,0.3);
    --link-color: #4ade80;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* 修复mainChat滚动问题 */
#mainChat {
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.container {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.header {
    background-color: #2c3e50;
    color: white;
    padding: 8px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    min-height: 50px;
}

.header h1 {
    font-size: 1.3rem;
    font-weight: 600;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    object-fit: cover;
}

#changeNickname {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    padding: 5px 10px;
    border-radius: 15px;
    cursor: pointer;
    transition: background 0.3s;
    font-size: 0.9rem;
}

#changeNickname:hover {
    background: rgba(255, 255, 255, 0.3);
}

#changeAvatar {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    padding: 5px 10px;
    border-radius: 15px;
    cursor: pointer;
    transition: background 0.3s;
    font-size: 0.9rem;
}

#changeAvatar:hover {
    background: rgba(255, 255, 255, 0.3);
}

.container {
    display: flex;
    flex: 1;
    overflow: hidden;
    height: calc(100vh - 100px);
}

.sidebar {
    width: 250px;
    background-color: #f8f9fa;
    border-right: 1px solid #ddd;
    padding: 15px;
    transition: all 0.3s ease;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    height: 100%;
}

.sidebar.collapsed {
    width: 50px;
    padding: 10px;
    overflow: hidden;
}

.sidebar.collapsed .online-users-content,
.sidebar.collapsed .offline-users-content,
.sidebar.collapsed .group-section,
.sidebar.collapsed .user-list-item span,
.sidebar.collapsed .section-title,
.sidebar.collapsed .toggle-sidebar-text,
.sidebar.collapsed .user-list li,
.sidebar.collapsed .online-users h3,
.sidebar.collapsed .offline-users h3,
.sidebar.collapsed .group-section h3,
.sidebar.collapsed .last-online,
.sidebar.collapsed .toggle-section {
    display: none !important;
}

.sidebar.collapsed .user-avatar {
    margin: 0 auto;
}

.toggle-sidebar {
    background: none;
    border: none;
    cursor: pointer;
    margin-bottom: 15px;
    font-size: 18px;
    color: #6c757d;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 5px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.toggle-sidebar:hover {
    background-color: #e9ecef;
}

.toggle-sidebar-text {
    margin-left: 8px;
    font-size: 0.9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar.collapsed .toggle-sidebar-text {
    display: none;
}

.online-users,
.offline-users,
.group-section {
    margin-top: 10px;
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

.online-users h3,
.offline-users h3,
.group-section h3 {
    margin-bottom: 10px;
    font-size: 1rem;
    color: #495057;
    border-bottom: 1px solid #dee2e6;
    padding-bottom: 5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.toggle-section {
    font-size: 12px;
    color: #6c757d;
    cursor: pointer;
}

/* 群组搜索框样式 */
.group-header-container {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 10px;
}

.group-header-container h3 {
    margin: 0;
    flex-shrink: 0;
    font-size: 1rem;
}

.group-search-container {
    display: flex;
    align-items: center;
    gap: 5px;
    flex: 1;
    max-width: 120px;
}

#groupSearchInput {
    width: 100% !important;
    max-width: 120px;
    padding: 4px 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 0.8rem;
    background-color: white;
    color: #333;
    transition: border-color 0.3s, box-shadow 0.3s;
    height: 28px;
}

#groupSearchInput:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

#groupSearchInput::placeholder {
    color: #999;
    font-size: 0.8rem;
}

#clearGroupSearch {
    background: none;
    border: none;
    color: #999;
    cursor: pointer;
    padding: 4px;
    border-radius: 3px;
    font-size: 0.8rem;
    transition: background-color 0.2s, color 0.2s;
    display: none;
}

#clearGroupSearch:hover {
    background-color: #f0f0f0;
    color: #666;
}

#clearGroupSearch.show {
    display: block;
}

/* 深色模式下的搜索框样式 */
.dark-mode #groupSearchInput {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.dark-mode #groupSearchInput:focus {
    border-color: #4a9eff;
    box-shadow: 0 0 0 2px rgba(74, 158, 255, 0.25);
}

.dark-mode #groupSearchInput::placeholder {
    color: var(--text-secondary);
}

.dark-mode #clearGroupSearch {
    color: var(--text-secondary);
}

.dark-mode #clearGroupSearch:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

/* 群组列表项高亮样式 */
#groupList li.highlight {
    background-color: #fff3cd;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.dark-mode #groupList li.highlight {
    background-color: rgba(255, 193, 7, 0.2);
}

.user-list {
    list-style: none;
    overflow-y: auto;
    flex: 1;
    padding-right: 5px;
}

.user-list.collapsed {
    display: none;
}

.user-list li {
    padding: 8px 0;
    display: flex;
    align-items: center;
    border-bottom: 1px solid #f1f1f1;
    transition: transform 0.2s;
}

.user-list li:hover {
    transform: translateX(5px);
    background-color: #f1f1f1;
    border-radius: 4px;
}

/* 状态指示器样式 */
.status-indicator {
    font-size: 12px;
    margin-right: 8px;
}

.status-indicator.online {
    color: #28a745;
}

.status-indicator.offline {
    color: #6c757d;
}

.last-online {
    font-size: 10px;
    color: #999;
    margin-left: 8px;
}

/* 聊天主区域布局 */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

/* 消息容器独立滚动 */
#messageContainer {
    flex: 1;
    overflow-y: auto;
    padding: 15px;
    background-color: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    min-height: 0;
    position: relative;
}

/* 修复聊天主区域布局 */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

/* 更新深色模式下的其他元素样式 */
.header {
    background-color: var(--bg-header);
    color: white;
}

.sidebar {
    background-color: var(--bg-secondary);
    border-right-color: var(--border-color);
}

.online-users h3,
.offline-users h3,
.group-section h3 {
    color: var(--text-secondary);
    border-bottom-color: var(--border-color);
}

.user-list li:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.message {
    background: var(--bg-message);
    color: var(--text-primary);
    box-shadow: 0 2px 5px var(--shadow-color);
}

.message.own-message {
    background: var(--bg-message-own);
}

.nickname {
    color: var(--text-secondary);
}

.input-area {
    background-color: var(--bg-input);
    border-top-color: var(--border-color);
}

#messageInput, #groupMessageInput {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.message-content h1, .message-content h2, .message-content h3 {
    color: var(--text-primary);
}

.message-content a {
    color: var(--link-color);
}

.message-content a:hover {
    color: var(--link-color);
}

/* Markdown编辑器相关深色模式样式 */
.markdown-toolbar {
    background-color: var(--bg-secondary);
    border-bottom-color: var(--border-color);
}

.markdown-btn {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border-color: var(--border-color);
}

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

/* 滚动条深色模式样式 */
.dark-mode ::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.dark-mode ::-webkit-scrollbar-track {
    background: var(--bg-primary);
    border-radius: 4px;
}

.dark-mode ::-webkit-scrollbar-thumb {
    background: #4a4a4a;
    border-radius: 4px;
}

.dark-mode ::-webkit-scrollbar-thumb:hover {
    background: #5a5a5a;
}

/* 完善消息容器深色模式样式 */
.dark-mode #messageContainer {
    background-color: var(--bg-secondary);
}

/* 完善输入区域容器深色模式样式 */
.dark-mode .input-area {
    background-color: var(--bg-input);
    border-top-color: var(--border-color);
}

/* 弹窗样式适配深色模式 */
.modal-content {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.modal-header, .modal-footer {
    border-color: var(--border-color);
}

/* 输入框样式适配深色模式 */
input[type="text"],
input[type="password"],
textarea {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border-color: var(--border-color);
}

/* 按钮样式适配深色模式 */
button {
    color: var(--text-primary);
}

/* 完善页尾深色模式样式 */
.dark-mode .status-bar {
    background-color: var(--bg-secondary);
    border-top-color: var(--border-color);
    color: var(--text-secondary);
}

.message {
    background: var(--bg-message);
    padding: 12px 15px;
    margin-bottom: 12px;
    border-radius: 10px;
    box-shadow: 0 2px 5px var(--shadow-color);
    max-width: 80%;
    position: relative;
    animation: fadeIn 0.3s ease;
    min-height: auto;
    word-wrap: break-word;
}

.message.own-message {
    background: var(--bg-message-own);
    margin-left: 20%;
    max-width: 80%;
    display: block;
}

.message-header {
    display: flex;
    align-items: center;
    margin-bottom: 5px;
}

.message-avatar {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    margin-right: 8px;
    object-fit: cover;
}

.nickname {
    font-weight: bold;
    font-size: 12px;
    color: #666;
}

/* 引号包裹的内容样式 */
.quoted-content {
    background-color: #f9f9f9;
    padding: 10px;
    border-radius: 5px;
    font-family: 'Courier New', monospace;
    border-left: 3px solid #ccc;
    word-break: break-all;
    white-space: pre-wrap;
    position: relative;
}

.dark-mode .quoted-content {
    background-color: rgba(255, 255, 255, 0.05);
    border-left-color: rgba(255, 255, 255, 0.2);
}

/* 深色模式下自己发送的消息昵称样式 */
.dark-mode .message.own-message .nickname {
    color: #d4d4d4;
    font-weight: bold;
}

.message-content {
    margin-bottom: 5px;
    word-break: break-word;
}

/* Markdown消息样式 */
.message-content h1, .message-content h2, .message-content h3 {
    margin: 10px 0 5px 0;
    color: #2c3e50;
}

.message-content p {
    margin: 5px 0;
    line-height: 1.4;
}

.message-content ul, .message-content ol {
    margin: 5px 0 5px 20px;
}

.message-content li {
    margin: 2px 0;
}

.message-content blockquote {
    border-left: 3px solid #07c160;
    margin: 5px 0;
    padding-left: 10px;
    color: #666;
    font-style: italic;
    background: #f9f9f9;
}

.message-content code {
    background-color: #f1f1f1;
    padding: 2px 4px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.message-content pre {
    background-color: #f8f9fa;
    padding: 10px;
    border-radius: 5px;
    overflow-x: auto;
    margin: 5px 0;
    border: 1px solid #e9ecef;
    font-family: 'Courier New', monospace;
}

.message-content pre code {
    background: none;
    padding: 0;
    font-family: 'Courier New', monospace;
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* 链接样式 */
.message-content a {
    color: #07c160;
    text-decoration: none;
    border-bottom: 1px solid #07c160;
    transition: all 0.2s ease;
}

.message-content a:hover {
    color: #05a653;
    border-bottom: 1px solid #05a653;
}

.message-content strong {
    font-weight: bold;
}

.message-content em {
    font-style: italic;
}

/* 图片样式增强 */
.message-image {
    max-width: 100%;
    max-height: 300px;
    border-radius: 8px;
    margin-top: 5px;
    margin-bottom: 5px;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border: 2px solid transparent;
}

.message-image:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    border-color: #07c160;
}

/* 深色模式下的图片样式 */
.dark-mode .message-image:hover {
    box-shadow: 0 4px 12px rgba(255, 255, 255, 0.1);
    border-color: var(--link-color);
}

.file-link-container {
    display: flex;
    align-items: center;
    padding: 12px;
    background-color: #f5f5f5;
    border-radius: 8px;
    border: 1px solid #ddd;
    max-width: 100%;
    word-break: break-all;
    transition: all 0.3s;
    cursor: pointer;
}

.file-link-container .file-link {
    display: flex;
    align-items: center;
    color: #1890ff;
    text-decoration: none !important;
    border-bottom: none !important;
    font-size: 14px;
    width: 100%;
}

.file-link-container .file-link::before {
    content: "📄";
    margin-right: 8px;
    font-size: 16px;
    display: inline-block;
}

.file-link-container .file-link span {
    display: inline-block;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-link-container:hover {
    color: #40a9ff;
    text-decoration: underline !important;
    border-bottom: none !important;
}

.message-image {
    max-width: 100%;
    max-height: 300px;
    border-radius: 8px;
    margin-top: 5px;
    cursor: pointer;
}

.message-time {
    font-size: 10px;
    color: #999;
    position: absolute;
    right: 15px;
    bottom: 5px;
}

.delete-button {
    position: absolute;
    top: 5px;
    right: 5px;
    background: rgba(0, 0, 0, 0.1);
    border: none;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    color: #666;
}

.message:hover .delete-button {
    display: flex;
}

.delete-button:hover {
    background: rgba(220, 53, 69, 0.2);
    color: #dc3545;
}

.input-area {
    padding: 12px 15px;
    background-color: white;
    border-top: 1px solid #ddd;
    display: flex;
    gap: 10px;
    align-items: center;
    flex-shrink: 0;
}

#messageInput, #groupMessageInput {
    flex: 1;
    min-width: 0; /* 修复弹性盒溢出问题 */
}

#sendButton, #sendGroupMessage {
    flex: 0 0 80px;
    width: auto;
}

.upload-container {
    flex: 0 0 100px;
}

#groupMessageContainer {
    flex: 1;
    overflow-y: auto;
    padding: 15px;
    background-color: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    min-height: 0;
    position: relative;
}

#groupMessageContainer .message {
    background: var(--bg-message);
    padding: 12px 15px;
    margin-bottom: 12px;
    border-radius: 10px;
    box-shadow: 0 2px 5px var(--shadow-color);
    max-width: 80%;
    position: relative;
    animation: fadeIn 0.3s ease;
    min-height: auto;
    word-wrap: break-word;
}

#groupMessageContainer .message.own-message {
    background: var(--bg-message-own);
    margin-left: 20%;
    max-width: 80%;
    display: block;
}

/* Markdown编辑器容器 */
.markdown-editor-container {
    position: relative;
    flex: 3;
    display: flex;
    flex-direction: column;
}

/* 输入框样式 */
#messageInput, #groupMessageInput {
    padding: 8px 15px;
    border: 1px solid #07c160;
    border-radius: 20px;
    font-size: 14px;
    outline: none;
    height: 36px;
    font-family: inherit;
    resize: vertical;
    min-height: 36px;
    max-height: 150px;
    /* 删除width:100% */
}

/* Markdown切换按钮 */
.markdown-toggle {
    position: absolute;
    right: 10px;
    top: 10px;
    background: #6c757d;
    color: white;
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    cursor: pointer;
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.markdown-toggle.active {
    background: #07c160;
}

.markdown-toggle:hover {
    background: #5a6268;
}

.markdown-toggle.active:hover {
    background: #06ad54;
}

/* Markdown工具栏样式 */
.markdown-toolbar {
    display: none;
    flex-wrap: wrap;
    gap: 5px;
    margin-bottom: 10px;
    padding: 10px;
    background: #f8f9fa;
    border-radius: 5px;
    border: 1px solid #ddd;
    width: 100%;
}

.markdown-toolbar.active {
    display: flex;
}

.markdown-btn {
    padding: 5px 10px;
    background: white;
    border: 1px solid #ddd;
    border-radius: 3px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.2s;
}

.markdown-btn:hover {
    background: #07c160;
    color: white;
    border-color: #07c160;
}

#sendButton, #sendGroupMessage {
    padding: 8px 16px;
    background: #07c160;
    color: white;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 14px;
    height: 36px;
    width: auto;
    display: flex;
    align-items: center;
    justify-content: center;
}

#sendButton:hover {
    background: #06ad54;
    transform: scale(1.05);
}

.upload-container {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    margin: 0;
    height: 36px;
    min-width: 100px;
}

#uploadButton, #groupUploadButton, #imageUploadButton, #groupImageUploadButton {
    background-color: #3498db;
    border: none;
    border-radius: 20px;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    width: 100%;
    height: 100%;
    padding: 6px 12px;
    margin: 0;
    transition: all 0.3s;
}

#uploadButton:hover, #groupUploadButton:hover, #imageUploadButton:hover, #groupImageUploadButton:hover {
    background: #2980b9;
    transform: scale(1.05);
}

.upload-text {
    margin-left: 5px;
    white-space: nowrap;
}

.status-bar {
    padding: 8px 15px;
    background: #f8f9fa;
    border-top: 1px solid #ddd;
    font-size: 12px;
    color: #6c757d;
    display: flex;
    justify-content: space-between;
}

.empty-state {
    text-align: center;
    padding: 30px;
    color: #6c757d;
    margin: auto;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: white;
    padding: 20px;
    border-radius: 10px;
    width: 320px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    position: relative;
}

.close-modal {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 24px;
    cursor: pointer;
    color: #999;
}

.close-modal:hover {
    color: #333;
}

.modal h3 {
    margin-top: 0;
    margin-bottom: 15px;
    color: #2c3e50;
    font-size: 1.2rem;
}

.modal input, .modal textarea, .modal select {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 14px;
}

.modal button {
    width: 100%;
    padding: 10px;
    background: #07c160;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    margin-top: 10px;
}

.modal-tabs {
    display: flex;
    margin-bottom: 15px;
    border-bottom: 1px solid #ddd;
}

.modal-tab {
    flex: 1;
    text-align: center;
    padding: 10px;
    cursor: pointer;
    transition: background-color 0.3s;
    user-select: none;
}

.modal-tab.active {
    background-color: #f8f9fa;
    border-bottom: 2px solid #07c160;
}

.modal-form {
    display: none;
}

.modal-form.active {
    display: block;
}

.image-preview-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}

.image-preview-content {
    max-width: 90%;
    max-height: 90%;
}

.preview-img {
    max-width: 100%;
    max-height: 100%;
    border-radius: 8px;
}

.close-preview {
    position: absolute;
    top: 20px;
    right: 20px;
    color: white;
    font-size: 30px;
    cursor: pointer;
    background: rgba(0, 0, 0, 0.5);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.upload-progress {
    width: 100%;
    height: 4px;
    background: #f0f0f0;
    border-radius: 5px;
    margin-top: 5px;
    overflow: hidden;
    display: none;
}

.upload-progress-bar {
    height: 100%;
    background: #07c160;
    width: 0%;
    transition: width 0.3s;
}

.avatar-preview {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin: 10px auto;
    overflow: hidden;
    border: 2px solid #ddd;
}

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

.member-checkbox {
    margin-right: 8px;
}

.member-item {
    padding: 8px;
    border-bottom: 1px solid #f1f1f1;
    display: flex;
    align-items: center;
}

.member-list {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin: 10px 0;
}

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

/* 在线人数统计样式 */
.online-count {
    background-color: #07c160;
    color: white;
    border-radius: 50%;
    width: 25px;
    height: 25px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    margin-left: 5px;
}

/* 群组聊天界面 - 增强CSS显示 */
#groupChat {
    display: none;
    flex-direction: column;
    height: 100vh;
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
    background: white;
    z-index: 100;
    overflow: hidden;
}

.group-header {
    background-color: #2c3e50;
    color: white;
    padding: 8px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    height: 50px;
    width: 100%;
    box-sizing: border-box;
}

#backToMain {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    padding: 5px 10px;
    border-radius: 15px;
    cursor: pointer;
    margin-right: 15px;
    font-size: 14px;
}

#backToMain:hover {
    background: rgba(255, 255, 255, 0.3);
}

.group-chat-container {
    display: flex;
    flex: 1;
    overflow: hidden;
    height: calc(100vh - 50px);
    width: 100%;
}

.group-sidebar {
    width: 200px;
    background-color: #f8f9fa;
    border-right: 1px solid #ddd;
    padding: 15px;
    overflow-y: auto;
    box-sizing: border-box;
    min-width: 200px;
}

.group-chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-width: 0;
}

/* 修复群组消息容器 */
#groupMessageContainer {
    flex: 1;
    overflow-y: auto;
    padding: 15px;
    background-color: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    min-height: 0;
    position: relative;
}

.group-input-area {
    padding: 12px 15px;
    background-color: white;
    border-top: 1px solid #ddd;
    display: flex;
    gap: 10px;
    align-items: center;
}

.group-admin-actions {
    display: flex;
    gap: 10px;
}

#manageGroupBtn {
    background-color: #07c160;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s ease;
}

#manageGroupBtn:hover {
    background-color: #05a653;
}

#addMemberBtn {
    background-color: #07c160;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s ease;
}

#leaveGroupBtn {
    background-color: #ff4d4f;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
    font-weight: 600;
}

#addMemberBtn:hover {
    background-color: #05a653;
}

#leaveGroupBtn:hover {
    background-color: #ff7875;
    transform: scale(1.05);
}

.group-management-tabs {
    display: flex;
    margin-bottom: 15px;
    border-bottom: 1px solid #ddd;
}

.management-tab {
    padding: 10px 15px;
    cursor: pointer;
    background-color: #f5f5f5;
    border: 1px solid #ddd;
    border-bottom: none;
    border-radius: 4px 4px 0 0;
    margin-right: 5px;
}

.management-tab.active {
    background-color: white;
    border-bottom: 1px solid white;
    margin-bottom: -1px;
}

.management-content {
    display: none;
    padding: 15px;
    background: #f9f9f9;
    border-radius: 6px;
}

.management-content.active {
    display: block;
}

.danger-btn {
    background-color: #ff4d4f;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s ease;
}

.danger-btn:hover {
    background-color: #ff7875;
}

/* 深色模式具体样式 */
.dark-mode #mainChat,
.dark-mode #groupChat {
    background-color: var(--bg-primary);
}

.dark-mode .container,
.dark-mode .group-chat-container {
    border-color: var(--border-color);
}

.dark-mode .header,
.dark-mode .group-header {
    background-color: var(--bg-header);
    color: var(--text-primary);
    border-bottom-color: var(--border-color);
}

.dark-mode .header h1 {
    color: var(--text-primary);
}

.dark-mode .user-info {
    color: var(--text-primary);
}

.dark-mode #changeNickname,
.dark-mode #changeAvatar,
.dark-mode #backToMain {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.dark-mode #changeNickname:hover,
.dark-mode #changeAvatar:hover,
.dark-mode #backToMain:hover {
    background: rgba(255, 255, 255, 0.2);
}

.dark-mode .sidebar,
.dark-mode .group-sidebar {
    background-color: var(--bg-secondary);
    border-right-color: var(--border-color);
}

.dark-mode .toggle-sidebar {
    color: var(--text-secondary);
}

.dark-mode .toggle-sidebar:hover {
    background-color: var(--bg-tertiary);
}

.dark-mode .online-users h3,
.dark-mode .offline-users h3,
.dark-mode .group-section h3 {
    color: var(--text-primary);
    border-bottom-color: var(--border-color);
}

.dark-mode .toggle-section {
    color: var(--text-secondary);
}

.dark-mode .user-list-item {
    color: var(--text-primary);
    border-bottom-color: var(--border-color);
}

.dark-mode .last-online {
    color: var(--text-secondary);
}

.dark-mode .online-status {
    color: var(--link-color);
}

.dark-mode .chat-main {
    background-color: var(--bg-primary);
}

.dark-mode #messageContainer,
.dark-mode #groupMessageContainer {
    background-color: var(--bg-primary);
}

.dark-mode .message {
    background-color: var(--bg-message);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.dark-mode .message.own-message {
    background-color: var(--bg-message-own);
}

.dark-mode .nickname {
    color: var(--text-secondary);
}

.dark-mode .message-content {
    color: var(--text-primary);
}

.dark-mode .message-content h1,
.dark-mode .message-content h2,
.dark-mode .message-content h3 {
    color: var(--text-primary);
}

.dark-mode .message-content blockquote {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    border-left-color: var(--link-color);
}

.dark-mode .message-content code {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.dark-mode .highlight {
    border-bottom-left-radius: 0 !important;
    border-bottom-right-radius: 0 !important;
    box-shadow: none !important;
}

.dark-mode .code pre {
    background-color: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-primary);
    padding-bottom: 12px !important;
    bottom: 0 !important;
}

.dark-mode .message-content a {
    color: var(--link-color);
}

.dark-mode .file-link-container {
    background-color: var(--bg-tertiary);
    border-color: var(--border-color);
    cursor: pointer;
    transition: all 0.3s;
}

.dark-mode .file-link {
    color: var(--link-color);
    width: 100%;
}

.dark-mode .file-link-container:hover {
    color: #569fff;
    text-decoration: underline !important;
    border-bottom: none !important;
}

.dark-mode .message-time {
    color: var(--text-secondary);
}

.dark-mode .delete-button {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
}

.dark-mode .delete-button:hover {
    background: rgba(220, 53, 69, 0.2);
    color: #dc3545;
}

.dark-mode .input-area,
.dark-mode .group-input-area {
    background-color: var(--bg-secondary);
    border-top-color: var(--border-color);
}

.dark-mode #messageInput,
.dark-mode #groupMessageInput {
    background-color: var(--bg-input);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.dark-mode #sendButton,
.dark-mode #sendGroupMessage {
    background-color: var(--link-color);
}

.dark-mode #sendButton:hover,
.dark-mode #sendGroupMessage:hover {
    background-color: #3dcf70;
}

.dark-mode #uploadButton,
.dark-mode #groupUploadButton,
.dark-mode #imageUploadButton,
.dark-mode #groupImageUploadButton {
    background-color: #2980b9;
}

.dark-mode #uploadButton:hover,
.dark-mode #groupUploadButton:hover,
.dark-mode #imageUploadButton:hover,
.dark-mode #groupImageUploadButton:hover {
    background-color: #1f6391;
}

.dark-mode .status-bar {
    background-color: var(--bg-secondary);
    border-top-color: var(--border-color);
    color: var(--text-secondary);
}

.dark-mode .empty-state {
    color: var(--text-secondary);
}

.dark-mode .modal-content {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.dark-mode .modal h3 {
    color: var(--text-primary);
}

.dark-mode .modal input,
.dark-mode .modal textarea,
.dark-mode .modal select {
    background-color: var(--bg-input);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.dark-mode .modal-tabs {
    border-bottom-color: var(--border-color);
}

.dark-mode .modal-tab {
    color: var(--text-secondary);
}

.dark-mode .modal-tab.active {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border-bottom-color: var(--link-color);
}

.dark-mode .modal-form {
    color: var(--text-primary);
}

.dark-mode .image-preview-modal {
    background-color: rgba(0, 0, 0, 0.9);
}

.dark-mode .close-preview {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.dark-mode .upload-progress {
    background-color: var(--bg-tertiary);
}

.dark-mode .upload-progress-bar {
    background-color: var(--link-color);
}

/* 深色模式下群组按钮悬浮样式 */
.dark-mode #createGroupButton:hover {
    background-color: var(--bg-tertiary);
}

.dark-mode .avatar-preview {
    border-color: var(--border-color);
}

.dark-mode .member-item {
    color: var(--text-primary);
    border-bottom-color: var(--border-color);
}

.dark-mode .member-list {
    border-color: var(--border-color);
    background-color: var(--bg-secondary);
}

.dark-mode .online-count {
    background-color: var(--link-color);
}

.dark-mode .group-admin-actions {
    color: var(--text-primary);
}

.dark-mode #manageGroupBtn,
.dark-mode #addMemberBtn {
    background-color: var(--link-color);
}

.dark-mode #manageGroupBtn:hover,
.dark-mode #addMemberBtn:hover {
    background-color: #3dcf70;
}

.dark-mode .group-management-tabs {
    border-bottom-color: var(--border-color);
}

.dark-mode .management-tab {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    border-color: var(--border-color);
}

.dark-mode .management-tab.active {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border-bottom-color: var(--bg-secondary);
}

.dark-mode .management-content {
    color: var(--text-primary);
}

.dark-mode .danger-btn {
    background-color: #ff4d4f;
}

.dark-mode .danger-btn:hover {
    background-color: #ff7875;
}

.dark-mode .close-modal {
    color: var(--text-secondary);
}

.dark-mode .close-modal:hover {
    color: var(--text-primary);
}

/* Markdown相关深色模式样式 */
.dark-mode .markdown-editor-container {
    background-color: var(--bg-secondary);
}

.dark-mode .markdown-toggle {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.dark-mode .markdown-toggle.active {
    background: var(--link-color);
}

.dark-mode .markdown-toggle:hover {
    background: var(--border-color);
}

.dark-mode .markdown-toggle.active:hover {
    background: #3dcf70;
}

.dark-mode .markdown-toolbar {
    background-color: var(--bg-tertiary);
    border-color: var(--border-color);
}

.dark-mode .markdown-btn {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.dark-mode .markdown-btn:hover {
    background-color: var(--link-color);
    border-color: var(--link-color);
}