/* CSS变量定义 */
:root {
    /* 浅色主题 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --border-color: #dee2e6;
    --accent-color: #4285f4;
    --accent-hover: #3367d6;
    --success-color: #34a853;
    --warning-color: #fbbc04;
    --error-color: #ea4335;
    --shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --shadow-hover: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
    --sidebar-width: 280px;
    --header-height: 60px;
}

/* 深色主题 */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #404040;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-muted: #808080;
    --border-color: #404040;
    --accent-color: #4285f4;
    --accent-hover: #5a95f5;
    --success-color: #34a853;
    --warning-color: #fbbc04;
    --error-color: #ea4335;
    --shadow: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.4);
    --shadow-hover: 0 3px 6px rgba(0,0,0,0.4), 0 3px 6px rgba(0,0,0,0.5);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* 应用容器 */
.app-container {
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* 顶部工具栏 */
.header {
    height: var(--header-height);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    box-shadow: var(--shadow);
    z-index: 1000;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 15px;
}

.sidebar-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 18px;
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: background-color 0.2s ease;
}

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

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

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 18px;
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: background-color 0.2s ease;
}

.theme-toggle:hover {
    background-color: var(--bg-tertiary);
}

/* 主内容区域 */
.main-content {
    flex: 1;
    display: flex;
    overflow: hidden;
}

/* 侧边栏 */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
    z-index: 999;
}

.sidebar.collapsed {
    transform: translateX(-100%);
}

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

.new-chat-btn {
    width: 100%;
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: background-color 0.2s ease;
}

.new-chat-btn:hover {
    background-color: var(--accent-hover);
}

/* 分类管理 */
.chat-categories {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.category-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
}

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

.add-category-btn:hover {
    background-color: var(--bg-tertiary);
}

.category-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s ease;
    margin-bottom: 4px;
    position: relative;
}

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

.category-item.active {
    background-color: var(--accent-color);
    color: white;
}

.category-actions {
    margin-left: auto;
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.category-item:hover .category-actions {
    opacity: 1;
}

.category-actions button {
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    font-size: 12px;
    transition: background-color 0.2s ease;
}

.category-actions button:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

/* 聊天历史 */
.chat-history {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
}

.history-header {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.history-item {
    padding: 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s ease;
    margin-bottom: 8px;
    border: 1px solid transparent;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.history-content {
    flex: 1;
    min-width: 0; /* 允许文本截断 */
}

.history-delete-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    opacity: 0;
    transition: all 0.2s ease;
    font-size: 12px;
}

.history-item:hover .history-delete-btn {
    opacity: 1;
}

.history-delete-btn:hover {
    background-color: var(--error-color);
    color: white;
}

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

.history-item.active {
    background-color: var(--accent-color);
    color: white;
}

.history-title {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.history-preview {
    font-size: 12px;
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.history-item.active .history-preview {
    color: rgba(255, 255, 255, 0.8);
}

/* 主聊天区域 */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
    transition: margin-left 0.3s ease;
}

/* 当侧边栏隐藏时，聊天容器扩展到全宽度 */
.sidebar.collapsed ~ .chat-container {
    margin-left: calc(-1 * var(--sidebar-width));
}

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

.model-selector {
    display: flex;
    align-items: center;
    gap: 12px;
}

.model-selector label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.model-selector select {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 8px 12px;
    font-size: 14px;
    cursor: pointer;
    min-width: 200px;
}

.chat-actions {
    display: flex;
    gap: 8px;
}

.chat-actions button {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: background-color 0.2s ease;
}

.chat-actions button:hover {
    background-color: var(--bg-tertiary);
}

/* 消息容器 */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.welcome-message {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.welcome-icon {
    font-size: 48px;
    margin-bottom: 20px;
    color: var(--accent-color);
}

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

/* 消息样式 */
.message {
    display: flex;
    gap: 12px;
    max-width: 80%;
    animation: fadeIn 0.3s ease;
}

.message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
}

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

.message.assistant .message-avatar {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.message-content {
    background-color: var(--bg-secondary);
    padding: 12px 16px;
    border-radius: 12px;
    position: relative;
    word-wrap: break-word;
    line-height: 1.6;
}

/* Markdown样式 */
.message-content h1,
.message-content h2,
.message-content h3 {
    margin: 16px 0 8px 0;
    font-weight: 600;
    line-height: 1.3;
}

.message-content h1 {
    font-size: 1.5em;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 8px;
}

.message-content h2 {
    font-size: 1.3em;
    color: var(--accent-color);
}

.message-content h3 {
    font-size: 1.1em;
    color: var(--text-secondary);
}

.message-content p {
    margin: 8px 0;
    line-height: 1.6;
}

.message-content strong {
    font-weight: 600;
    color: var(--text-primary);
}

.message-content em {
    font-style: italic;
    color: var(--text-secondary);
}

.message-content code {
    background-color: var(--bg-tertiary);
    color: var(--accent-color);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9em;
}

.message-content pre {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    margin: 12px 0;
    overflow-x: auto;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9em;
    line-height: 1.4;
}

.message-content pre code {
    background: none;
    padding: 0;
    border-radius: 0;
    color: var(--text-primary);
}

.message-content ul,
.message-content ol {
    margin: 8px 0;
    padding-left: 20px;
}

.message-content li {
    margin: 4px 0;
    line-height: 1.5;
}

.message-content a {
    color: var(--accent-color);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}

.message-content a:hover {
    border-bottom-color: var(--accent-color);
}

.message-content blockquote {
    border-left: 4px solid var(--accent-color);
    margin: 12px 0;
    padding: 8px 16px;
    background-color: var(--bg-tertiary);
    border-radius: 0 8px 8px 0;
    font-style: italic;
}

.message.user .message-content {
    background-color: var(--accent-color);
    color: white;
}

.message-actions {
    position: absolute;
    top: -8px;
    right: 8px;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.message:hover .message-actions {
    opacity: 1;
}

.copy-btn {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.delete-btn {
    background-color: var(--error-color);
    border: 1px solid var(--error-color);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    margin-left: 4px;
    transition: all 0.2s ease;
}

.delete-btn:hover {
    background-color: #d32f2f;
    border-color: #d32f2f;
}

/* 图片消息 */
.message-image {
    max-width: 100%;
    border-radius: 8px;
    margin-top: 8px;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.message-image:hover {
    transform: scale(1.02);
}

/* 生成图片容器样式 */
.generated-image-container {
    margin: 10px 0;
}

.image-description {
    margin-bottom: 8px;
    color: var(--text-color);
    font-size: 14px;
}

.message-image {
    max-width: 100%;
    max-height: 400px;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.message-image:hover {
    transform: scale(1.02);
}

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

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

.uploaded-images {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.uploaded-image {
    width: 60px;
    height: 60px;
    border-radius: 6px;
    object-fit: cover;
    border: 2px solid var(--border-color);
}

.remove-images-btn {
    background-color: var(--error-color);
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 12px;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.remove-images-btn:hover {
    background-color: #d93025;
}

.input-area {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 12px;
}

.input-wrapper:focus-within {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(66, 133, 244, 0.2);
}

#messageInput {
    flex: 1;
    border: none;
    outline: none;
    background: none;
    color: var(--text-primary);
    font-size: 14px;
    resize: none;
    min-height: 20px;
    max-height: 120px;
    font-family: inherit;
}

#messageInput::placeholder {
    color: var(--text-muted);
}

.input-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.upload-btn, .send-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.send-btn {
    color: var(--accent-color);
}

.send-btn:hover:not(:disabled) {
    background-color: var(--accent-color);
    color: white;
}

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

.input-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: var(--text-muted);
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    animation: fadeIn 0.3s ease;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--bg-primary);
    border-radius: 12px;
    box-shadow: var(--shadow-hover);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    animation: slideIn 0.3s ease;
}

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

.modal-header h3 {
    margin: 0;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: background-color 0.2s ease;
}

.modal-close:hover {
    background-color: var(--bg-tertiary);
}

.modal-body {
    padding: 20px;
    max-height: 60vh;
    overflow-y: auto;
}

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

/* 按钮样式 */
.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.2s ease;
    font-family: inherit;
}

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

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

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

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

/* 加载动画 */
.loading-dots {
    display: inline-flex;
    gap: 4px;
    align-items: center;
}

.loading-dots::after {
    content: '';
    display: inline-block;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background-color: currentColor;
    animation: loadingDots 1.4s infinite ease-in-out both;
}

.loading-dots::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background-color: currentColor;
    animation: loadingDots 1.4s infinite ease-in-out both;
    animation-delay: -0.32s;
    margin-right: 4px;
}

/* 动画定义 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes loadingDots {
    0%, 80%, 100% { 
        transform: scale(0);
        opacity: 0.5;
    } 
    40% { 
        transform: scale(1);
        opacity: 1;
    }
}

/* 桌面端侧边栏默认显示 */
@media (min-width: 769px) {
    .sidebar {
        transform: translateX(0);
    }
    
    .sidebar.collapsed {
        transform: translateX(-100%);
    }
    
    .sidebar-overlay {
        display: none;
    }
}
@media (max-width: 768px) {
    :root {
        --sidebar-width: 280px;
    }
    
    /* 移动端侧边栏样式 */
    .sidebar {
        position: fixed;
        top: var(--header-height);
        left: 0;
        height: calc(100vh - var(--header-height));
        z-index: 1001;
        box-shadow: 2px 0 10px rgba(0,0,0,0.1);
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }
    
    .sidebar:not(.collapsed) {
        transform: translateX(0);
    }
    
    .sidebar.collapsed {
        transform: translateX(-100%);
    }
    
    /* 移动端遮罩层 */
    .sidebar-overlay {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100vw;
        height: calc(100vh - var(--header-height));
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 1000;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.3s ease, visibility 0.3s ease;
    }
    
    .sidebar-overlay.active {
        opacity: 1;
        visibility: visible;
    }
    
    /* 聊天容器在移动端的调整 */
    .chat-container {
        margin-left: 0;
        width: 100%;
    }
    
    .sidebar.collapsed ~ .chat-container {
        margin-left: 0;
    }
    
    .message {
        max-width: 95%;
    }
    
    .input-container {
        padding: 12px;
    }
    
    .chat-header {
        padding: 12px;
        flex-direction: column;
        gap: 12px;
        align-items: stretch;
    }
    
    .model-selector {
        justify-content: space-between;
    }
    
    .model-selector select {
        min-width: auto;
        flex: 1;
    }
    
    /* 移动端按钮优化 */
    .sidebar-toggle {
        display: block;
        padding: 12px;
        font-size: 20px;
    }
    
    /* 移动端输入区域优化 */
    .input-group {
        flex-direction: column;
        gap: 8px;
    }
    
    .input-group textarea {
        min-height: 80px;
    }
    
    .input-actions {
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .input-actions button {
        min-height: 44px;
        padding: 12px 16px;
    }
}

@media (max-width: 480px) {
    .app-title {
        display: none;
    }
    
    .header {
        padding: 0 12px;
    }
    
    .messages-container {
        padding: 12px;
    }
    
    .welcome-message {
        padding: 40px 12px;
    }
    
    .welcome-icon {
        font-size: 36px;
    }
    
    .welcome-message h2 {
        font-size: 20px;
    }
    
    /* 移动端输入区域进一步优化 */
    .input-container {
        padding: 8px;
    }
    
    .input-wrapper {
        padding: 8px;
        gap: 8px;
    }
    
    #messageInput {
        font-size: 16px; /* 防止iOS缩放 */
        min-height: 24px;
    }
    
    .input-actions button {
        min-width: 40px;
        min-height: 40px;
        font-size: 16px;
    }
    
    .upload-btn, .send-btn {
        padding: 10px;
        /* 确保移动端按钮可点击 */
        touch-action: manipulation;
        -webkit-tap-highlight-color: transparent;
        cursor: pointer;
    }
    
    .send-btn:disabled {
        opacity: 0.5;
        cursor: not-allowed;
        pointer-events: none;
    }
    
    /* 移动端消息显示区域优化 */
    .messages-container {
        padding: 8px;
        /* 改善滚动性能 */
        -webkit-overflow-scrolling: touch;
        scroll-behavior: smooth;
    }
    
    .message {
        margin-bottom: 16px;
        max-width: 95%;
    }
    
    .message-content {
        font-size: 14px;
        line-height: 1.5;
        padding: 10px 12px;
        /* 改善文本选择 */
        -webkit-user-select: text;
        user-select: text;
    }
    
    .message-avatar {
        width: 32px;
        height: 32px;
        font-size: 14px;
    }
    
    .message-actions {
        position: static;
        opacity: 1;
        margin-top: 8px;
        gap: 8px;
        display: flex;
        justify-content: flex-end;
    }
    
    .message-actions button {
        min-width: 36px;
        min-height: 36px;
        padding: 8px;
        font-size: 12px;
    }
    
    /* 移动端代码块优化 */
    .message-content pre {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        font-size: 12px;
        padding: 8px;
        margin: 8px 0;
    }
    
    .message-content code {
        font-size: 12px;
        padding: 2px 4px;
    }
    
    /* 移动端图片显示优化 */
    .message-content img {
        max-width: 100%;
        height: auto;
        border-radius: 8px;
        margin: 8px 0;
    }
    
    .uploaded-images img {
        max-width: 80px;
        max-height: 80px;
        border-radius: 6px;
    }
    
    /* 移动端欢迎消息优化 */
    .welcome-message {
        padding: 20px 12px;
    }
    
    .welcome-icon {
        font-size: 32px;
        margin-bottom: 16px;
    }
    
    .welcome-message h2 {
        font-size: 18px;
        margin-bottom: 8px;
    }
    
    .welcome-message p {
        font-size: 14px;
        line-height: 1.4;
    }
    
    /* 移动端模态框优化 */
    .modal-content {
        margin: 20px;
        max-width: calc(100vw - 40px);
        max-height: calc(100vh - 40px);
        overflow-y: auto;
    }
    
    .modal-header {
        padding: 16px;
    }
    
    .modal-body {
        padding: 16px;
    }
    
    .modal-footer {
        padding: 16px;
        gap: 8px;
    }
    
    .modal-footer button {
        min-height: 44px;
        padding: 12px 16px;
    }
    
    /* 移动端按钮优化 */
    .btn {
        min-height: 44px;
        padding: 12px 16px;
        font-size: 14px;
    }
    
    .new-chat-btn {
        min-height: 44px;
        padding: 12px 16px;
    }
    
    .category-item {
        min-height: 44px;
        padding: 12px;
    }
    
    .history-item {
        min-height: 44px;
        padding: 12px;
    }
    
    /* 移动端消息样式优化 */
    .message {
        margin-bottom: 16px;
    }
    
    .message-content {
        font-size: 14px;
        line-height: 1.5;
    }
    
    .message-actions {
        gap: 8px;
    }
    
    .message-actions button {
        min-width: 36px;
        min-height: 36px;
        padding: 8px;
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

/* 存储空间警告样式 */
.storage-warning {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    max-width: 350px;
    padding: 16px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    animation: slideInRight 0.3s ease-out;
}

.storage-warning.warning {
    background-color: #fff3cd;
    border: 1px solid #ffeaa7;
    color: #856404;
}

.storage-warning.error {
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    color: #721c24;
}

.warning-content strong {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
}

.warning-content p {
    margin: 0 0 12px 0;
    font-size: 13px;
    line-height: 1.4;
}

.warning-content button {
    margin-right: 8px;
    padding: 6px 12px;
    border: none;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.storage-warning.warning button:first-of-type {
    background-color: #ffc107;
    color: #212529;
}

.storage-warning.warning button:first-of-type:hover {
    background-color: #e0a800;
}

.storage-warning.error button:first-of-type {
    background-color: #dc3545;
    color: white;
}

.storage-warning.error button:first-of-type:hover {
    background-color: #c82333;
}

.warning-content button:last-of-type {
    background-color: #6c757d;
    color: white;
}

.warning-content button:last-of-type:hover {
    background-color: #5a6268;
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* 暗色主题下的存储警告样式 */
[data-theme="dark"] .storage-warning.warning {
    background-color: #664d03;
    border-color: #997404;
    color: #ffecb5;
}

[data-theme="dark"] .storage-warning.error {
    background-color: #58151c;
    border-color: #842029;
    color: #f8d7da;
}

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

/* 选择文本样式 */
::selection {
    background-color: var(--accent-color);
    color: white;
}

/* 焦点样式 */
button:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}