/* 模态框样式 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    animation: modalFadeIn 0.2s ease-out;
}

.modal-overlay.show {
    display: flex;
}

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

.modal-container {
    background: var(--container-bg);
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    min-width: 320px;
    max-width: 90vw;
    width: 480px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.modal-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--assistant-msg-fg);
    margin: 0;
}

.modal-close {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: transparent;
    border: none;
    font-size: 28px;
    line-height: 1;
    color: var(--timestamp-fg);
    cursor: pointer;
    transition: color 0.2s, transform 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

html[data-theme='dark'] .modal-close {
    background: transparent;
}

.modal-close:hover {
    color: var(--error-fg);
    transform: rotate(90deg);
}

.modal-close:active {
    transform: rotate(90deg) scale(0.9);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
    flex: 1;
    min-height: 0;
}

.modal-body::-webkit-scrollbar {
    width: 6px;
}

.modal-body::-webkit-scrollbar-track {
    background: var(--scrollbar-track) !important;
}

.modal-body::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb) !important;
    border-radius: 3px !important;
}

.modal-body::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover) !important;
}

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

::-webkit-scrollbar-track {
    background: var(--scrollbar-track) !important;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb) !important;
    border-radius: 4px;
    transition: background 0.2s ease !important;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover) !important;
}

/* 针对需要更细滚动条的元素进行覆盖 */
.modal-body::-webkit-scrollbar,
.session-list::-webkit-scrollbar {
    width: 6px;
}

.modal-body::-webkit-scrollbar-thumb,
.session-list::-webkit-scrollbar-thumb {
    border-radius: 3px;
}


#modalMessage {
    margin: 0;
    font-size: 15px;
    line-height: 1.6;
    color: var(--assistant-msg-fg);
    word-wrap: break-word;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    flex-shrink: 0;
}

.modal-btn {
    padding: 10px 24px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    white-space: nowrap;
}

.modal-btn-cancel {
    background: var(--session-item-hover);
    color: var(--assistant-msg-fg);
}

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

.modal-btn-confirm {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

html[data-theme='dark'] .modal-btn-confirm {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
}

.modal-btn-confirm:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

.modal-btn-confirm:active {
    transform: translateY(0);
}

/* 仅显示确定按钮的样式 */
.modal-footer.single-button {
    justify-content: center;
}

.modal-footer.single-button .modal-btn-cancel {
    display: none;
}

/* 移动端模态框优化 */
@media (max-width: 600px) {
    .modal-container {
        width: 90vw;
        min-width: 280px;
    }

    .modal-header {
        padding: 16px 20px;
    }

    .modal-title {
        font-size: 16px;
    }

    .modal-body {
        padding: 20px;
    }

    #modalMessage {
        font-size: 14px;
    }

    .modal-footer {
        padding: 12px 16px;
    }

    .modal-btn {
        flex: 1;
        padding: 10px 16px;
        font-size: 14px;
    }
}

:root {
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --container-bg: #ffffff;
    --header-fg: #ffffff;
    --user-msg-bg: #667eea;
    --assistant-msg-bg: #f0f0f0;
    --assistant-msg-fg: #333;
    --error-bg: #ffebee;
    --error-fg: #c62828;
    --border-color: #e0e0e0;
    --input-border: #ddd;
    --input-focus: #667eea;
    --timestamp-fg: #999;
    --timestamp-fg-user: rgba(255, 255, 255, 0.75);
    --info-bg: #f9f9f9;
    --scrollbar-thumb: rgba(0,0,0,.2);
    --scrollbar-thumb-hover: rgba(0,0,0,.3);
    --scrollbar-track: rgba(0,0,0,.05);
    --select-bg: #ffffff;
    --select-option-bg: #ffffff;
    --select-option-hover: #f5f5f5;
    --sidebar-bg: #f8f9fa;
    --session-item-hover: #e9ecef;
    --session-item-active: #667eea;
    --loading-dot-color: #667eea;
    /* 移动端视口高度变量 */
    --vh: 1vh;
}

html[data-theme='dark'] {
    --bg-gradient: linear-gradient(135deg, #1f2937 0%, #111827 100%);
    --container-bg: #1e1e1e;
    --header-fg: #e5e7eb;
    --user-msg-bg: #0e1e54;
    --assistant-msg-bg: #2d2d2d;
    --assistant-msg-fg: #d1d5db;
    --error-bg: #5c1b1b;
    --error-fg: #f87171;
    --border-color: #374151;
    --input-border: #374151;
    --input-focus: #6366f1;
    --timestamp-fg: #6b7280;
    --timestamp-fg-user: rgba(255, 255, 255, 0.9);
    --info-bg: #111827;
    --scrollbar-thumb: rgba(156, 163, 175, 0.3);
    --scrollbar-thumb-hover: rgba(156, 163, 175, 0.5);
    --scrollbar-track: rgba(55, 65, 81, 0.3);
    --select-bg: #2d2d2d;
    --select-option-bg: #1e1e1e;
    --select-option-hover: #374151;
    --sidebar-bg: #1a1a1a;
    --session-item-hover: #2d2d2d;
    --session-item-active: #4f46e5;
    --loading-dot-color: #6366f1;
}

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

body {
    font-family: -apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;
    background: var(--bg-gradient);
    /* 修改为固定全屏布局，支持移动端安全区域 */
    height: 100vh;
    /* 使用 dvh (动态视口高度) 代替 vh，适配移动端地址栏 */
    height: 100dvh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--assistant-msg-fg);
}

/* 为不支持 dvh 的浏览器添加回退 */
@supports not (height: 100dvh) {
    body {
        height: 100vh;
    }
}

/* 聊天容器布局 - 修改为全屏 */
.chat-container {
    display: flex;
    width: 100vw;
    width: 100dvw;
    height: 100vh;
    height: 100dvh;
    background: var(--container-bg);
    box-shadow: 0 20px 60px rgba(0,0,0,.3);
    overflow: hidden;
    position: relative; /* 添加相对定位，作为子元素的定位参考 */
}

/* 为不支持 dvh 的浏览器添加回退 */
@supports not (height: 100dvh) {
    .chat-container {
        width: 100vw;
        height: 100vh;
    }
}

/* 会话侧边栏 */
.session-sidebar {
    width: 280px;
    min-width: 280px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    z-index: 10; /* 确保侧边栏在正常层级 */
}

.session-sidebar.collapsed {
    margin-left: -280px;
    /* 移除 absolute，使用负 margin 隐藏 */
    z-index: 100; /* 展开时提升层级 */
}

.session-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.session-header h2 {
    font-size: 16px;
    font-weight: 600;
    color: var(--assistant-msg-fg);
}

.btn-new-session {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--user-msg-bg);
    color: white;
    border: none;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s;
    flex-shrink: 0;
}

.btn-new-session:hover {
    transform: scale(1.1);
}

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

.session-item {
    padding: 12px;
    margin-bottom: 8px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    position: relative;
}

.session-item:hover {
    background: var(--session-item-hover);
}

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

.session-item.active .session-name,
.session-item.active .session-meta {
    color: white;
}

/* 待创建的会话样式 */
.session-item.pending {
    opacity: 0.6;
    cursor: default;
    background: var(--session-item-hover);
    border: 1px dashed var(--border-color);
}

.session-item.pending .session-name {
    font-style: italic;
    color: var(--timestamp-fg);
}

.session-item.pending:hover {
    background: var(--session-item-hover);
}

.session-info {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    position: relative;
}

.session-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--assistant-msg-fg);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 4px;
    position: relative;
    padding-right: 4px;
}

.session-meta {
    font-size: 11px;
    color: var(--timestamp-fg);
    display: flex;
    gap: 8px;
}

.btn-delete-session {
    width: 28px;
    height: 28px;
    min-width: 28px;
    border-radius: 4px;
    background: transparent;
    border: none;
    font-size: 14px;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s, background-color 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

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

.btn-delete-session:hover {
    background-color: rgba(239, 68, 68, 0.15);
}

.session-item.active .btn-delete-session:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.sidebar-toggle {
    /* 改为 absolute，相对于 chat-main 定位 */
    position: absolute;
    left: 290px;
    top: 20px;
    width: 36px;
    height: 36px;
    background: var(--user-msg-bg);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: bold;
    color: white;
    z-index: 999;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
}

html[data-theme='dark'] .sidebar-toggle {
    background: var(--user-msg-bg);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
}

.sidebar-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.4);
}

html[data-theme='dark'] .sidebar-toggle:hover {
    box-shadow: 0 4px 16px rgba(79, 70, 229, 0.5);
}

.sidebar-toggle:active {
    transform: scale(0.95);
}

/* 收起状态下的按钮位置 */
.session-sidebar.collapsed + .chat-main .sidebar-toggle {
    left: 20px;
}

/* 聊天主区域 */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    position: relative; /* 添加相对定位，作为 sidebar-toggle 的定位参考 */
}

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

.header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--header-fg);
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

html[data-theme='dark'] .header {
    background: linear-gradient(135deg,#4f46e5 0%,#7c3aed 100%);
}

.header h1 {
    font-size: 20px;
    margin: 0;
    flex: 1;
    min-width: 150px;
}

.status {
    font-size: 12px;
    opacity: .9;
    white-space: nowrap;
}

.status.connected::before {
    content: '●';
    color: #4caf50;
    margin-right: 5px;
}

.status.disconnected::before {
    content: '●';
    color: #f44336;
    margin-right: 5px;
}

.theme-toggle {
    background: rgba(255,255,255,.15);
    color: var(--header-fg);
    padding: 6px 12px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
    white-space: nowrap;
    flex-shrink: 0;
}

.theme-toggle:hover {
    background: rgba(255,255,255,.25);
}

html[data-theme='dark'] .theme-toggle {
    background: rgba(0,0,0,.3);
}

/* 模型选择器样式 */
.model-selector {
    padding: 12px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    background: var(--container-bg);
}

.model-selector label {
    font-size: 14px;
    font-weight: 500;
    color: var(--assistant-msg-fg);
    white-space: nowrap;
}

.model-select {
    flex: 1;
    min-width: 200px;
    max-width: 400px;
    padding: 8px 12px;
    border: 1px solid var(--input-border);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    background: var(--select-bg);
    color: var(--assistant-msg-fg);
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.model-select:focus {
    outline: none;
    border-color: var(--input-focus);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

html[data-theme='dark'] .model-select:focus {
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.model-select:hover:not(:disabled) {
    border-color: var(--input-focus);
}

.model-select:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.model-select optgroup {
    font-weight: 600;
    font-style: normal;
    background: var(--select-option-bg);
    color: var(--assistant-msg-fg);
}

.model-select option {
    padding: 6px;
    font-weight: 400;
    background: var(--select-option-bg);
    color: var(--assistant-msg-fg);
}

/* 深色模式下 select 的特殊处理 */
html[data-theme='dark'] .model-select {
    color-scheme: dark;
}

.chat-area {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    min-height: 0;
}

.message {
    display: flex;
    gap: 12px;
    animation: slideIn .3s ease-out;
    width: 100%;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.user {
    justify-content: flex-end;
}

.message-content {
    max-width: 70%;
    padding: 12px 16px;
    border-radius: 12px;
    word-wrap: break-word;
    word-break: break-word;
    overflow-wrap: break-word;
    line-height: 1.5;
    position: relative;
    min-width: 0;
}

.message.user .message-content {
    background: var(--user-msg-bg);
    color: #fff;
    border-radius: 12px 4px 12px 12px;
}

.message.assistant .message-content {
    background: var(--assistant-msg-bg);
    color: var(--assistant-msg-fg);
    border-radius: 4px 12px 12px 12px;
}

.message.error .message-content {
    background: var(--error-bg);
    color: var(--error-fg);
    border-radius: 12px;
}

.avatar {
    width: 32px;
    height: 32px;
    min-width: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 16px;
    color: #fff;
    flex-shrink: 0;
}

.message.user .avatar {
    background: #667eea;
    order: 2;
}

.message.assistant .avatar {
    background: #764ba2;
    order: -1;
}

html[data-theme='dark'] .message.user .avatar {
    background: #4f46e5;
}

html[data-theme='dark'] .message.assistant .avatar {
    background: #7c3aed;
}

.timestamp {
    font-size: 11px;
    color: var(--timestamp-fg);
    margin-top: 6px;
    opacity: 0.9;
}

/* 用户消息的时间戳使用不同颜色 */
.message.user .timestamp {
    color: var(--timestamp-fg-user);
}

/* 加载动画样式 */
.loading-dots {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 0;
}

.loading-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--loading-dot-color);
    animation: loading-bounce 1.4s infinite ease-in-out both;
}

.loading-dots span:nth-child(1) {
    animation-delay: -0.32s;
}

.loading-dots span:nth-child(2) {
    animation-delay: -0.16s;
}

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

/* 流式响应中的加载指示器 */
.streaming-indicator {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--loading-dot-color);
    animation: pulse 1.5s ease-in-out infinite;
    margin-left: 4px;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.3;
        transform: scale(0.8);
    }
}

.input-area {
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: flex-end;
}

.input-group {
    flex: 1;
    min-width: 200px;
    display: flex;
    gap: 12px;
    align-items: flex-end;
}

textarea {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    resize: vertical;
    min-height: 60px;
    max-height: 200px;
    background: transparent;
    color: inherit;
    min-width: 0;
}

button {
    padding: 12px 20px;
    background: linear-gradient(135deg,#667eea 0%,#764ba2 100%);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: transform .2s, box-shadow .2s;
    white-space: nowrap;
}

html[data-theme='dark'] button {
    background: linear-gradient(135deg,#4f46e5 0%,#7c3aed 100%);
}

button:hover:not(:disabled) {
    box-shadow: 0 10px 20px rgba(102,126,234,.3);
}

button:active:not(:disabled) {
    transform: translateY(0);
}

button:disabled {
    opacity: .6;
    cursor: not-allowed;
}

.info {
    font-size: 12px;
    color: var(--timestamp-fg);
    text-align: center;
    padding: 10px;
    background: var(--info-bg);
}

/* Markdown 样式覆盖 - 确保不会横向溢出 */
.markdown-body {
    overflow-wrap: break-word;
    word-break: break-word;
}

.markdown-body pre {
    overflow-x: auto;
    max-width: 100%;
}

.markdown-body code {
    word-break: break-all;
}

.markdown-body pre code {
    word-break: normal;
}

.markdown-body img {
    max-width: 100%;
    height: auto;
}

.markdown-body table {
    display: block;
    overflow-x: auto;
    max-width: 100%;
}

/* 平板设备响应式优化 */
@media (max-width: 900px) {
    .message-content {
        max-width: 75%;
    }
}

/* 移动设备响应式优化 */
@media (max-width: 600px) {
    body {
        /* 确保移动端使用完整可用高度 */
        height: 100vh;
        height: 100dvh;
        /* 使用 JavaScript 计算的真实视口高度 */
        height: calc(var(--vh, 1vh) * 100);
        min-height: -webkit-fill-available;
    }

    .chat-container {
        flex-direction: column;
        height: 100vh;
        height: 100dvh;
        height: calc(var(--vh, 1vh) * 100);
        min-height: -webkit-fill-available;
        overflow: hidden;
        /* 移除 fixed，使用正常文档流 */
        position: relative;
        /* 不再需要 top/left/right/bottom */
    }

    .session-sidebar {
        /* 使用 absolute 替代 fixed，相对于 chat-container 定位 */
        position: absolute;
        left: 0;
        top: 0;
        width: 280px;
        height: 100%;
        z-index: 1000;
        margin-left: 0;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        /* 防止内容被挤压 */
        pointer-events: none;
    }

    .session-sidebar.show {
        transform: translateX(0);
        pointer-events: auto;
    }
    
    .session-sidebar.collapsed {
        margin-left: 0;
        transform: translateX(-100%);
    }

    /* 显示侧边栏关闭按钮 */
    .session-sidebar .sidebar-close-btn {
        display: flex;
    }

    /* 移动端会话名称支持长按显示完整标题 */
    .session-name {
        -webkit-touch-callout: default;
        -webkit-user-select: text;
        user-select: text;
    }
    
    /* 为长标题添加渐变淡出效果 */
    .session-name::after {
        content: '';
        position: absolute;
        right: 0;
        top: 0;
        width: 30px;
        height: 100%;
        background: linear-gradient(to left, var(--sidebar-bg), transparent);
        pointer-events: none;
    }
    
    .session-item.active .session-name::after {
        background: linear-gradient(to left, var(--session-item-active), transparent);
    }
    
    .session-item:hover .session-name::after {
        background: linear-gradient(to left, var(--session-item-hover), transparent);
    }

    .sidebar-toggle {
        /* 改为 absolute，相对于父容器定位 */
        position: absolute;
        left: 16px;
        top: 16px;
        width: 40px;
        height: 40px;
        font-size: 20px;
        z-index: 998;
    }

    .chat-main {
        width: 100%;
        height: 100%;
        display: flex;
        flex-direction: column;
        overflow: hidden;
        position: relative;
    }

    .container {
        width: 100%;
        height: 100%;
        display: flex;
        flex-direction: column;
        overflow: hidden;
        position: relative;
    }

    .header {
        padding: 12px 16px;
        gap: 8px;
        min-height: 64px;
        display: flex;
        grid-template-columns: 1fr auto auto;
        grid-template-rows: 1fr;
        align-items: center;
        flex-wrap: nowrap;
        flex-shrink: 0;
    }

    .header h1 {
        font-size: 16px;
        grid-column: 1;
        grid-row: 1;
        min-width: 0;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        margin: 0;
    }

    .status {
        font-size: 11px;
        grid-column: 2;
        grid-row: 1;
        margin: 0;
    }

    .theme-toggle {
        padding: 8px;
        font-size: 18px;
        grid-column: 3;
        grid-row: 1;
        min-width: 36px;
        width: 36px;
        height: 36px;
        display: flex;
        align-items: center;
        justify-content: center;
        margin: 0;
    }

    .model-selector {
        padding: 10px 12px;
        gap: 8px;
        flex-shrink: 0;
    }

    .model-selector label {
        font-size: 13px;
        width: 100%;
    }

    .model-select {
        width: 100%;
        min-width: 0;
        max-width: none;
        font-size: 13px;
        padding: 8px 10px;
    }

    .chat-area {
        padding: 16px 12px;
        gap: 10px;
        flex: 1;
        overflow-y: auto;
        overflow-x: hidden;
        -webkit-overflow-scrolling: touch;
        min-height: 0;
        /* 优化移动端滚动性能 */
        will-change: scroll-position;
        transform: translateZ(0);
        -webkit-transform: translateZ(0);
    }

    .message {
        gap: 8px;
    }

    .message-content {
        max-width: 80%;
        padding: 10px 14px;
        font-size: 14px;
    }

    .avatar {
        width: 28px;
        height: 28px;
        min-width: 28px;
        font-size: 14px;
    }

    .timestamp {
        font-size: 10px;
        margin-top: 4px;
    }

    .input-area {
        padding: 12px;
        gap: 8px;
        flex-shrink: 0;
        /* 确保输入框不被键盘遮挡 */
        position: relative;
        background: var(--container-bg);
    }

    .input-group {
        min-width: 0;
        width: 100%;
        flex-direction: column;
        gap: 8px;
    }

    textarea {
        min-height: 50px;
        max-height: 120px;
        font-size: 14px;
        padding: 10px 12px;
        width: 100%;
        /* 防止输入时页面缩放 */
        font-size: 16px;
    }

    button {
        width: 100%;
        padding: 10px 16px;
        font-size: 14px;
    }

    .info {
        font-size: 11px;
        padding: 8px;
    }

    .sidebar-toggle-mobile {
        width: 36px;
        font-size: 18px;
    }
}

/* 会话侧边栏遮罩层（仅移动端） */
.sidebar-overlay {
    /* 改为 absolute，相对于 chat-container 定位 */
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: none;
    z-index: 999;
    animation: modalFadeIn 0.2s ease-out;
}

.sidebar-overlay.show {
    display: block;
}

/* 消息操作栏容器 */
.message-actions {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 4px;
    margin-top: 8px; /* 与内容保持间距 */
    padding-top: 4px;
    border-top: 1px solid rgba(0,0,0,0.05); /* 可选：加个分割线 */
}

html[data-theme='dark'] .message-actions {
    border-top-color: rgba(255,255,255,0.05);
}

/* 取消按钮样式 - 修改为内嵌样式 */
.cancel-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    padding: 0;
    margin: 0;
    background: transparent;
    color: var(--error-fg);
    border: 1px solid var(--error-fg);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    vertical-align: middle;
}

html[data-theme='dark'] .cancel-btn {
    background: transparent;
    border-color: var(--error-fg);
}

.cancel-btn:hover {
    background: var(--error-fg);
    color: white;
    transform: none;
    box-shadow: none;
}

.cancel-btn:active {
    transform: scale(0.95);
}

/* 复制按钮样式补充 */
.btn-copy-markdown {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    padding: 0;
    margin: 0;
    background: transparent !important;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--timestamp-fg);
    cursor: pointer;
    transition: all 0.2s;
    vertical-align: middle;
}

.btn-copy-markdown:hover {
    background: var(--border-color);
    color: var(--assistant-msg-fg);
}

/* 删除按钮样式 */
.btn-delete-message {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    padding: 0;
    margin: 0;
    background: transparent !important;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--timestamp-fg);
    cursor: pointer;
    transition: all 0.2s;
    vertical-align: middle;
}

.btn-delete-message:hover {
    background: rgba(239, 68, 68, 0.1) !important;
    color: var(--error-fg);
    border-color: var(--error-fg);
}