:root {
    --bg-primary: #f5f5f7;
    --bg-secondary: #ffffff;
    --bg-sidebar: #f0f0f2;
    --bg-hover: #e8e8eb;
    --bg-chat-area: #ffffff;
    --bg-user-msg: #e8f4fd;
    --bg-assistant-msg: #ffffff;
    --bg-input: #ffffff;
    --border-color: #e0e0e4;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-tertiary: #999;
    --accent-color: #1a73e8;
    --accent-hover: #1557b0;
    --accent-light: #e8f0fe;
    --danger-color: #ea4335;
    --success-color: #34a853;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 24px;
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    --sidebar-width: 280px;
    --header-height: 56px;
    --input-area-height: 140px;
    --transition: 0.2s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    display: flex;
}

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #aaa;
}

.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: transform var(--transition);
}

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

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.sidebar-logo .logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, #1a73e8, #7c4dff);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 18px;
}

.new-chat-btn {
    padding: 8px 16px;
    background: var(--accent-color);
    color: #fff;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: all var(--transition);
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 6px;
}

.new-chat-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

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

.session-item {
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    color: var(--text-primary);
    margin-bottom: 2px;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all var(--transition);
    position: relative;
}

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

.session-item.active {
    background: var(--accent-light);
    color: var(--accent-color);
    font-weight: 500;
}

.session-item .session-icon {
    flex-shrink: 0;
    font-size: 10px;
    color: #999;
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 3px;
    background: #e8e8eb;
}

.recent-agent-avatar {
    width: 18px;
    height: 18px;
    border-radius: 3px;
    background: #e8e8eb;
    color: #666;
    font-size: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: hidden;
}

.session-item .session-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.session-item .session-delete {
    opacity: 0;
    flex-shrink: 0;
    cursor: pointer;
    color: var(--text-tertiary);
    transition: all var(--transition);
    padding: 2px 4px;
    border-radius: 4px;
    font-size: 14px;
}

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

.session-item .session-delete:hover {
    color: var(--danger-color);
    background: rgba(234,67,53,0.1);
}

.sidebar-nav-section {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-nav-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    margin-bottom: 2px;
    text-decoration: none;
}

.sidebar-nav-item:hover {
    background: var(--bg-hover);
}

.sidebar-nav-item.active {
    background: var(--accent-light);
    color: var(--accent-color);
    font-weight: 500;
}

.sidebar-nav-icon {
    font-size: 14px;
    width: 20px;
    text-align: center;
    flex-shrink: 0;
    color: #999;
}

.sidebar-nav-item.active .sidebar-nav-icon {
    color: var(--accent-color);
}

/* 项目面板 */
.project-panel {
    display: none;
    position: fixed;
    left: var(--sidebar-width);
    top: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    z-index: 50;
    flex-direction: column;
    overflow: hidden;
}

.project-panel.active {
    display: flex;
}

.project-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
    flex-shrink: 0;
}

.project-panel-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

.project-panel-actions {
    display: flex;
    gap: 10px;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

.btn-ghost {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-family: inherit;
    transition: all var(--transition);
}

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

.btn {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition);
    font-family: inherit;
    line-height: 1.4;
}

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

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

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

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

.project-list-view {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}

.project-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.project-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: 14px;
    position: relative;
}

.project-item:hover {
    border-color: var(--accent-color);
    box-shadow: var(--shadow-sm);
    transform: translateY(-2px);
}

.project-item-icon {
    font-size: 32px;
    flex-shrink: 0;
}

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

.project-item-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.project-item-date {
    font-size: 12px;
    color: var(--text-tertiary);
}

.project-item-delete {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 24px;
    height: 24px;
    border-radius: 4px;
    border: none;
    background: none;
    cursor: pointer;
    color: var(--text-tertiary);
    font-size: 14px;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
}

.project-item:hover .project-item-delete {
    opacity: 1;
}

.project-item-delete:hover {
    background: rgba(234,67,53,0.1);
    color: var(--danger-color);
}

/* 项目编辑视图 */
.project-edit-view {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 24px;
}

.project-edit-content {
    flex: 1;
    display: flex;
    gap: 24px;
    overflow: hidden;
}

.project-edit-sidebar {
    width: 180px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.project-edit-tab {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    border: none;
    background: none;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
    text-align: left;
    transition: all var(--transition);
    font-family: inherit;
}

.project-edit-tab:hover {
    background: var(--bg-hover);
}

.project-edit-tab.active {
    background: var(--accent-light);
    color: var(--accent-color);
    font-weight: 500;
}

.project-edit-main {
    flex: 1;
    overflow-y: auto;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    padding: 24px;
}

.project-edit-pane {
    display: none;
}

.project-edit-pane.active {
    display: block;
}

.project-edit-pane h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

/* 表单样式 */
.form-input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--text-primary);
    background: var(--bg-primary);
    font-family: inherit;
    box-sizing: border-box;
    transition: border-color var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(26,115,232,0.1);
}

.form-textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--text-primary);
    background: var(--bg-primary);
    font-family: inherit;
    box-sizing: border-box;
    resize: vertical;
    line-height: 1.6;
    transition: border-color var(--transition);
}

.form-textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(26,115,232,0.1);
}

.form-actions {
    margin-top: 16px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

/* 素材 */
.material-form {
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    padding: 16px;
    margin-bottom: 20px;
}

.material-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.material-item {
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    padding: 14px 16px;
    border: 1px solid var(--border-color);
}

.material-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 6px;
}

.material-item-header strong {
    font-size: 14px;
    color: var(--text-primary);
}

.material-delete {
    width: 24px;
    height: 24px;
    border-radius: 4px;
    border: none;
    background: none;
    cursor: pointer;
    color: var(--text-tertiary);
    font-size: 14px;
    transition: all var(--transition);
}

.material-delete {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 14px;
    padding: 2px 6px;
    border-radius: 4px;
    transition: all var(--transition);
}

.material-delete:hover {
    background: rgba(234,67,53,0.1);
    color: var(--danger-color);
}

.material-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px;
    margin-bottom: 10px;
}

.material-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.material-item-header strong {
    font-size: 14px;
    color: var(--text-primary);
}

.material-item-content {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    white-space: pre-wrap;
}

@media (max-width: 768px) {
    .project-panel {
        left: 0;
    }
    .project-edit-content {
        flex-direction: column;
    }
    .project-edit-sidebar {
        width: 100%;
        flex-direction: row;
        overflow-x: auto;
    }
    .project-edit-sidebar .project-edit-tab {
        white-space: nowrap;
        flex-shrink: 0;
    }
    .project-list {
        grid-template-columns: 1fr;
    }
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: auto;
}

.admin-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 13px;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
}

.admin-link:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.sidebar-login-btn {
    background: var(--accent-color) !important;
    color: #fff !important;
    font-weight: 500;
    justify-content: center;
    text-align: center;
}

.sidebar-login-btn:hover {
    background: var(--accent-hover) !important;
    color: #fff !important;
}

.user-menu-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    font-weight: 500;
}

.user-menu-avatar {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: linear-gradient(135deg, #1a73e8, #7c4dff);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    flex-shrink: 0;
    background-size: cover;
    background-position: center;
}

.user-menu-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    text-align: left;
    font-size: 13px;
}

.user-menu-arrow {
    font-size: 12px;
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

.user-menu-toggle.open .user-menu-arrow {
    transform: rotate(90deg);
}

.user-menu-sub {
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.3s ease;
    padding-left: 8px;
}

.user-menu-sub.open {
    max-height: 300px;
}

.user-menu-sub .admin-link {
    padding: 6px 12px;
    font-size: 12px;
}

.membership-badge-mini {
    display: inline-block;
    font-size: 10px;
    font-weight: 600;
    padding: 1px 6px;
    border-radius: 4px;
    background: linear-gradient(135deg, #1a73e8, #1557b0);
    color: #fff;
    margin-left: 4px;
    vertical-align: middle;
}

.msg-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    border-radius: 9px;
    background: #ea4335;
    color: #fff;
    font-size: 10px;
    font-weight: 700;
    margin-left: 6px;
    line-height: 1;
}

.main-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100vh;
    min-width: 0;
}

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

.chat-header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-primary);
    padding: 4px;
}

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

.toolbox-dropdown {
    position: relative;
}

.toolbox-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    font-family: inherit;
    white-space: nowrap;
    transition: background 0.2s;
}

.toolbox-toggle:hover {
    background: var(--bg-hover);
}

.toolbox-arrow {
    font-size: 10px;
    transition: transform 0.2s ease;
    color: var(--text-secondary);
}

.toolbox-dropdown.open .toolbox-arrow {
    transform: rotate(180deg);
}

.toolbox-menu {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    min-width: 200px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
    z-index: 1000;
    padding: 6px 0;
    overflow: hidden;
}

.toolbox-dropdown.open .toolbox-menu {
    display: block;
}

.toolbox-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    font-size: 13px;
    color: var(--text-primary);
    text-decoration: none;
    transition: background 0.15s;
    white-space: nowrap;
}

.toolbox-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.model-selector {
    position: relative;
}

.model-select-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    cursor: pointer;
    font-size: 13px;
    color: var(--text-primary);
    transition: all var(--transition);
}

.model-select-btn:hover {
    border-color: var(--accent-color);
}

.model-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    min-width: 220px;
    z-index: 100;
    overflow: hidden;
}

.model-dropdown.show {
    display: block;
}

.model-option {
    padding: 10px 16px;
    cursor: pointer;
    font-size: 13px;
    transition: background var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.model-option:hover {
    background: var(--bg-hover);
}

.model-option.active {
    background: var(--accent-light);
    color: var(--accent-color);
}

.model-option .model-icon {
    font-size: 18px;
}

.model-option .model-info {
    display: flex;
    flex-direction: column;
}

.model-option .model-provider {
    font-size: 11px;
    color: var(--text-tertiary);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.welcome-screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    color: var(--text-secondary);
}

.welcome-screen .welcome-icon {
    font-size: 56px;
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, #1a73e8, #7c4dff);
    border-radius: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}

.welcome-screen h1 {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
}

.welcome-screen p {
    font-size: 14px;
    color: var(--text-tertiary);
}

.welcome-hints {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 10px;
    justify-content: center;
}

.hint-chip {
    padding: 8px 18px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    transition: all var(--transition);
    white-space: nowrap;
    box-sizing: border-box;
}

.hint-chip:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background: var(--accent-light);
}

/* 星星按钮已移除，恢复默认间距 */

.hint-star {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 12px;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition);
    display: inline-block;
    line-height: 1;
}

.hint-star:hover {
    color: #fbbf24;
    transform: translateY(-50%) scale(1.2);
}

.hint-star.active {
    color: #fbbf24;
}

/* 新的星星按钮样式 */
.hint-star-btn {
    position: absolute;
    right: 5px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 16px;
    color: #666;
    cursor: pointer;
    transition: all 0.2s ease;
    z-index: 1000;  /* 提高到最顶层 */
    background: none;
    border: none;
    padding: 4px 6px;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    min-height: 24px;
}

.hint-star-btn:hover {
    color: #fbbf24;
    transform: translateY(-50%) scale(1.3);
}

.hint-star-btn.active {
    color: #fbbf24;
}

.message-row {
    display: flex;
    gap: 12px;
    padding: 12px 0;
    max-width: 820px;
    margin: 0 auto;
    width: 100%;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.message-avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
}

.message-avatar.user {
    background: #1a73e8;
    color: #fff;
}

.message-avatar.assistant {
    background: linear-gradient(135deg, #7c4dff, #1a73e8);
    color: #fff;
}

.message-body {
    flex: 1;
    min-width: 0;
}

.message-content {
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-primary);
    word-break: break-word;
}

.message-content p {
    margin-bottom: 8px;
}

.message-content p:last-child {
    margin-bottom: 0;
}

.message-content pre {
    background: #1e1e1e;
    color: #d4d4d4;
    padding: 16px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 10px 0;
    font-size: 13px;
    line-height: 1.5;
}

.message-content code {
    font-family: var(--font-mono);
    font-size: 13px;
    background: #f0f0f2;
    padding: 2px 6px;
    border-radius: 4px;
    color: #ea4335;
}

.message-content pre code {
    background: none;
    padding: 0;
    color: #d4d4d4;
}

.message-content ul, .message-content ol {
    margin: 8px 0;
    padding-left: 24px;
}

.message-content li {
    margin-bottom: 4px;
}

.message-content table {
    border-collapse: collapse;
    margin: 10px 0;
    width: 100%;
}

.message-content th, .message-content td {
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    text-align: left;
    font-size: 13px;
}

.message-content th {
    background: var(--bg-primary);
    font-weight: 500;
}

.message-content blockquote {
    border-left: 3px solid var(--accent-color);
    padding-left: 12px;
    color: var(--text-secondary);
    margin: 8px 0;
}

.message-content h1, .message-content h2, .message-content h3, .message-content h4 {
    margin: 16px 0 8px 0;
    font-weight: 600;
    line-height: 1.3;
}

.message-content h1 {
    font-size: 24px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.message-content h2 {
    font-size: 20px;
}

.message-content h3 {
    font-size: 18px;
}

.message-content h4 {
    font-size: 16px;
}

.message-content hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 16px 0;
}

.message-content a {
    color: var(--accent-color);
    text-decoration: none;
}

.message-content a:hover {
    text-decoration: underline;
}

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

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

.message-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 6px;
    font-size: 12px;
    color: var(--text-tertiary);
    position: relative;
}

.message-actions {
    display: flex;
    gap: 6px;
}

.message-action-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    color: var(--text-tertiary);
    font-size: 14px;
    transition: all var(--transition);
}

.action-icon {
    color: #333;  /* 纯黑色图标 */
    font-size: 14px;
}

.message-action-btn:hover .action-icon {
    color: var(--accent-color);
}

.message-action-btn.liked .action-icon,
.message-action-btn.saved .action-icon {
    color: var(--accent-color);
}

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

.message-action-btn.liked {
    color: var(--accent-color);
}

/* 分享下拉菜单 */
.share-dropdown {
    position: absolute;
    bottom: 100%;
    right: 0;
    z-index: 100;
    min-width: 140px;
}
.share-menu {
    background: var(--bg-primary, #fff);
    border: 1px solid var(--border-color, #e5e5e5);
    border-radius: 10px;
    padding: 6px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}
.share-menu-item {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 8px 12px;
    border: none;
    background: none;
    font-size: 14px;
    color: #333;
    cursor: pointer;
    border-radius: 6px;
    font-family: inherit;
    text-align: left;
    transition: background 0.15s;
}
.share-menu-item:hover {
    background: var(--bg-hover, #f5f5f5);
}
.share-icon {
    font-size: 12px;
    color: #999;
}

/* ============ 分享页面 ============ */
.share-page {
    width: 100%;
    max-width: 680px;
    margin: 0 auto;
}

.share-page-container {
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.08);
    overflow: hidden;
}

.share-page-header {
    background: linear-gradient(135deg, #7c4dff 0%, #1a73e8 100%);
    padding: 24px 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.share-page-logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.share-logo-icon {
    width: 36px;
    height: 36px;
    background: rgba(255,255,255,0.2);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 18px;
}

.share-logo-text {
    color: #fff;
    font-weight: 600;
    font-size: 16px;
}

.share-page-meta {
    text-align: right;
}

.share-page-title {
    display: block;
    color: rgba(255,255,255,0.9);
    font-size: 13px;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.share-page-date {
    display: block;
    color: rgba(255,255,255,0.6);
    font-size: 12px;
    margin-top: 2px;
}

.share-page-conversation {
    padding: 24px 28px;
    background: #fafbff;
}

.share-message {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.share-message:last-child {
    margin-bottom: 0;
}

.share-message-avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
    font-weight: 600;
}

.share-message-avatar.user {
    background: #1a73e8;
    color: #fff;
}

.share-message-avatar.assistant {
    background: linear-gradient(135deg, #7c4dff, #1a73e8);
    color: #fff;
}

.share-message-body {
    flex: 1;
    min-width: 0;
}

.share-message-content {
    background: #fff;
    border-radius: 12px;
    padding: 16px 20px;
    font-size: 15px;
    line-height: 1.8;
    color: #333;
    word-break: break-word;
    border: 1px solid #eef0ff;
}

.share-message-content p {
    margin-bottom: 8px;
}

.share-message-content p:last-child {
    margin-bottom: 0;
}

.share-message-content pre {
    background: #f5f6fa;
    border-radius: 8px;
    padding: 12px 16px;
    overflow-x: auto;
    font-size: 13px;
    line-height: 1.5;
    margin: 8px 0;
}

.share-message-content code {
    background: #f5f6fa;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
}

.share-message-content pre code {
    background: none;
    padding: 0;
}

.share-message-model {
    font-size: 12px;
    color: #999;
    margin-top: 6px;
    padding-left: 4px;
}

.share-page-footer {
    padding: 20px 28px;
    text-align: center;
    border-top: 1px solid #f0f0f0;
    background: #fff;
}

.share-page-footer p {
    font-size: 13px;
    color: #999;
    margin-bottom: 12px;
}

.share-page-btn {
    display: inline-block;
    padding: 10px 28px;
    background: linear-gradient(135deg, #7c4dff, #1a73e8);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.2s;
    font-family: inherit;
}

.share-page-btn:hover {
    opacity: 0.9;
}

.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 4px 0;
}

.typing-indicator span {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--text-tertiary);
    animation: typingBounce 1.4s infinite;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-6px); opacity: 1; }
}

.chat-input-area {
    padding: 16px 20px 20px;
    background: #fff !important;
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
}

.input-wrapper {
    max-width: 820px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 10px 16px;
    transition: border-color var(--transition);
    min-height: 80px;
}

.input-wrapper:focus-within {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(26,115,232,0.1);
}

.chat-textarea {
    flex: 1;
    border: none;
    outline: none;
    background: none;
    font-size: 15px;
    line-height: 1.5;
    color: var(--text-primary);
    resize: none;
    max-height: 300px;
    min-height: 80px;
    font-family: inherit;
}

.chat-textarea::placeholder {
    color: var(--text-tertiary);
}

.send-btn {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--accent-color);
    border: none;
    color: #fff;
    cursor: pointer;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    flex-shrink: 0;
    opacity: 0.5;
    text-align: center;
    line-height: 38px;
    padding: 0;
    box-sizing: border-box;
}

.send-btn.active {
    opacity: 1;
}

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

.send-btn:disabled {
    cursor: not-allowed;
    opacity: 0.4;
}

.send-btn.stop {
    background: #e74c3c;
    font-size: 14px;
    animation: pulse-stop 1.5s infinite;
}

.send-btn.stop:hover {
    background: #c0392b;
    transform: scale(1.05);
}

@keyframes pulse-stop {
    0%, 100% { box-shadow: 0 0 0 0 rgba(231, 76, 60, 0.4); }
    50% { box-shadow: 0 0 0 6px rgba(231, 76, 60, 0); }
}

.upload-btn {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition);
}

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

/* 上传/选择按钮堆叠 */
.upload-buttons-stack {
    display: flex;
    flex-direction: column;
    gap: 4px;
    align-self: center;
}

.select-btn {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition);
}

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

/* 品牌文件选择弹窗 */
.brand-file-modal .brand-file-tab.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
    font-weight: 600;
}

.brand-file-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.15s;
    border: 1px solid transparent;
}

.brand-file-item:hover {
    background: var(--bg-hover);
}

.brand-file-item.selected {
    background: var(--accent-color-light, rgba(99, 102, 241, 0.08));
    border-color: var(--accent-color);
}

.brand-file-item-icon {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
}

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

.brand-file-item-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.brand-file-item-meta {
    font-size: 11px;
    color: var(--text-tertiary);
    margin-top: 2px;
}

.brand-file-item-check {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
}

.brand-file-item.selected .brand-file-item-check {
    background: var(--accent-color);
    border-color: var(--accent-color);
}

.brand-file-item.selected .brand-file-item-check::after {
    content: '✓';
    color: #fff;
    font-size: 11px;
    font-weight: 700;
}

/* 项目选择下拉 */
#brandFileProjectSelector select {
    width: 100%;
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    cursor: pointer;
}

/* 上传文件列表 */
.uploaded-files {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 8px 0;
    min-height: 0;
    transition: min-height 0.2s;
}

.uploaded-files:empty {
    min-height: 0;
    padding: 0;
}

.uploaded-file-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 12px;
    color: var(--text-secondary);
    max-width: 100%;
    transition: all var(--transition);
}

.uploaded-file-item:hover {
    background: var(--bg-hover);
    border-color: var(--accent-color);
}

.uploaded-file-item .file-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.uploaded-file-item .file-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-weight: 500;
    color: var(--text-primary);
}

.uploaded-file-item .file-size {
    color: var(--text-tertiary);
    font-size: 11px;
}

.uploaded-file-item .remove-file {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: var(--bg-primary);
    color: var(--text-tertiary);
    cursor: pointer;
    border-radius: 50%;
    font-size: 14px;
    line-height: 1;
    transition: all var(--transition);
    flex-shrink: 0;
}

.uploaded-file-item .remove-file:hover {
    background: #ef4444;
    color: white;
    transform: scale(1.1);
}
}

/* 文档类型图标 */
.file-icon {
    width: 24px;
    height: 24px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    flex-shrink: 0;
}

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

.file-icon.pdf {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
}

.file-icon.doc {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
}

.file-icon.xls {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    color: white;
}

.file-icon.ppt {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    color: white;
}

.file-icon.txt {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    color: #333;
}

.file-icon.csv {
    background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%);
    color: white;
}

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

/* 上传进度条 */
.upload-progress {
    width: 60px;
    height: 4px;
    background: var(--bg-hover);
    border-radius: 2px;
    overflow: hidden;
    flex-shrink: 0;
}

.upload-progress-bar {
    height: 100%;
    background: var(--accent-color);
    border-radius: 2px;
    transition: width 0.1s linear;
    min-width: 0;
}

/* 上传状态图标 */
.upload-status {
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 12px;
}

.upload-status.success {
    color: #10b981;
}

.upload-status.error {
    color: #ef4444;
}

.upload-status.uploading {
    color: var(--text-tertiary);
}

/* 输入行布局 */
.input-row {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
}

/* 上传按钮垂直居中 */
.input-row .upload-btn {
    align-self: center;
}

/* 输入框容器 - 让输入框占据剩余空间并靠底部 */
.input-row .textarea-container {
    flex: 1;
    display: flex;
    align-items: flex-end;
    min-height: 38px;
}

/* 输入框样式 */
.input-row .chat-textarea {
    width: 100%;
    border: none;
    outline: none;
    background: none;
    font-size: 15px;
    line-height: 1.5;
    color: var(--text-primary);
    resize: none;
    padding: 0;
    margin: 0;
}

/* 发送按钮靠右边 */
.input-row .send-btn {
    align-self: flex-end;
    margin-left: auto;
}

/* 占位符靠底部 */
.chat-textarea::placeholder {
    color: var(--text-tertiary);
    vertical-align: bottom;
}

.tools-bar {
    max-width: 820px;
    margin: 10px auto 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.tool-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 14px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
    white-space: nowrap;
    transform: translateY(4px);
}

.tool-chip:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background: var(--accent-light);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.tool-chip:active {
    transform: translateY(0);
}

.tool-chip.active {
    background: var(--accent-color);
    color: #fff;
    border-color: var(--accent-color);
    font-weight: 600;
}

/* 功能栏（输入框内部折叠面板） */
.feature-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    padding: 6px 8px;
    margin-bottom: 6px;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    font-size: 12px;
    animation: featureBarIn 0.2s ease;
}

@keyframes featureBarIn {
    from { opacity: 0; max-height: 0; padding-top: 0; padding-bottom: 0; margin-bottom: 0; }
    to { opacity: 1; max-height: 60px; padding-top: 6px; padding-bottom: 6px; margin-bottom: 6px; }
}

.fb-section {
    display: flex;
    align-items: center;
    gap: 6px;
}

.fb-label {
    font-size: 11px;
    color: var(--text-tertiary);
    white-space: nowrap;
    flex-shrink: 0;
}

.fb-chip {
    display: inline-flex;
    align-items: center;
    padding: 2px 9px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 11px;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.fb-chip:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background: var(--accent-light);
}

.fb-chip.active {
    background: var(--accent-color);
    color: #fff;
    border-color: var(--accent-color);
}

.fb-select {
    font-size: 11px;
    padding: 3px 8px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    outline: none;
    min-width: 80px;
}

.fb-select:focus {
    border-color: var(--accent-color);
}

.fb-sep {
    width: 1px;
    height: 14px;
    background: var(--border-color);
    margin: 0 2px;
}

.fb-scene-row {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
}

.fb-scene-row .fb-label {
    font-weight: 600;
    color: var(--accent-color);
}

.fb-label.accent {
    color: var(--accent-color);
    font-weight: 600;
}

/* 快速插入提示词按钮 */
.prompt-lib-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}
.prompt-lib-btn:hover { border-color: var(--accent-color); color: var(--accent-color); background: var(--accent-light); }

/* 提示词库面板 */
.prompt-lib-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.3);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.15s ease;
}
.prompt-lib-panel {
    width: 100%;
    max-width: 820px;
    max-height: 70vh;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    animation: promptPanelIn 0.2s ease;
    box-shadow: 0 4px 24px rgba(0,0,0,0.15);
    margin: 0 16px;
}
.prompt-lib-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}
.prompt-lib-header h3 { font-size: 15px; font-weight: 600; margin: 0; }
.prompt-lib-close {
    width: 28px; height: 28px; border: none; border-radius: 50%;
    background: var(--bg-secondary); cursor: pointer; font-size: 14px;
    display: flex; align-items: center; justify-content: center; color: var(--text-secondary);
}
.prompt-lib-close:hover { background: var(--border-color); }
.prompt-lib-tabs {
    display: flex; gap: 0; padding: 0 20px; border-bottom: 1px solid var(--border-color); flex-shrink: 0;
}
.prompt-lib-tab {
    padding: 10px 16px; font-size: 13px; border: none; background: none;
    color: var(--text-secondary); cursor: pointer; border-bottom: 2px solid transparent;
    transition: all var(--transition);
}
.prompt-lib-tab.active { color: var(--accent-color); border-bottom-color: var(--accent-color); font-weight: 500; }
.prompt-lib-body {
    flex: 1; overflow-y: auto; padding: 12px 20px;
}
.prompt-lib-item {
    display: flex; align-items: center; justify-content: space-between;
    padding: 10px 14px; border-radius: var(--radius-md); cursor: pointer;
    transition: background var(--transition); margin-bottom: 4px;
    border: 1px solid transparent;
}
.prompt-lib-item:hover { background: var(--accent-light); border-color: var(--accent-light); }
.prompt-lib-item-title {
    font-size: 13px; color: var(--text-primary); font-weight: 500;
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1;
}
.prompt-lib-item-action {
    font-size: 11px; color: var(--accent-color); flex-shrink: 0; margin-left: 12px;
    opacity: 0; transition: opacity var(--transition);
}
.prompt-lib-item:hover .prompt-lib-item-action { opacity: 1; }
.prompt-lib-empty {
    text-align: center; padding: 40px 20px; color: var(--text-tertiary); font-size: 13px;
}
@keyframes promptPanelIn {
    from { opacity: 0; transform: scale(0.95) translateY(10px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.input-footer {
    max-width: 820px;
    margin: 14px auto 0;
    padding-bottom: 8px;
    font-size: 11px;
    color: var(--text-tertiary);
    text-align: center;
    background: #fff !important;
}

.footer-sep {
    color: var(--border-color);
    margin: 0 6px;
}

.footer-link {
    color: var(--text-tertiary);
    text-decoration: none;
    transition: color 0.2s;
    white-space: nowrap;
}

.footer-link:hover {
    color: var(--accent-color);
}

/* Toast */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    color: #fff;
    font-size: 14px;
    box-shadow: var(--shadow-md);
    animation: slideIn 0.3s ease;
    max-width: 360px;
}

.toast.error { background: var(--danger-color); }
.toast.success { background: var(--success-color); }
.toast.info { background: var(--accent-color); }

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

/* Empty state */
.empty-state {
    text-align: center;
    color: var(--text-tertiary);
    padding: 40px 20px;
    font-size: 13px;
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        z-index: 200;
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.4);
        z-index: 199;
    }

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

    .menu-toggle {
        display: block;
    }

    .message-row {
        padding: 10px 0;
    }

    .chat-messages {
        padding: 12px;
    }

    .chat-input-area {
        padding: 10px 12px 0;
    }
}

/* ========== 登录/注册弹窗 ========== */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 300;
    align-items: center;
    justify-content: center;
}

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

.modal {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 32px;
    width: 400px;
    max-width: 90vw;
    box-shadow: var(--shadow-lg);
    animation: modalIn 0.25s ease;
}

@keyframes modalIn {
    from { transform: scale(0.95); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.modal-title {
    font-size: 20px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 24px;
}

.modal-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.modal-tab {
    flex: 1;
    padding: 10px;
    text-align: center;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-tertiary);
    border-bottom: 2px solid transparent;
    transition: all var(--transition);
    background: none;
    border-top: none;
    border-left: none;
    border-right: none;
}

.modal-tab.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
    font-weight: 500;
}

.modal-form {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.modal-form .form-group label {
    display: block;
    margin-bottom: 4px;
    font-size: 13px;
    color: var(--text-secondary);
}

.modal-form .form-group input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: inherit;
    transition: border-color var(--transition);
}

.modal-form .form-group input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(26,115,232,0.1);
}

.modal-submit {
    padding: 10px;
    background: var(--accent-color);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition);
}

.modal-submit:hover {
    background: var(--accent-hover);
}

.modal-error {
    color: var(--danger-color);
    font-size: 13px;
    text-align: center;
    display: none;
}

.modal-close {
    position: absolute;
    top: 12px;
    right: 16px;
    background: none;
    border: none;
    font-size: 22px;
    cursor: pointer;
    color: var(--text-tertiary);
    padding: 4px;
    line-height: 1;
}

.user-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: var(--accent-color);
    color: #fff;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: all var(--transition);
    white-space: nowrap;
}

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

.user-btn.logged-in {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.user-btn.logged-in:hover {
    background: var(--bg-hover);
}

.user-menu {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    min-width: 160px;
    z-index: 100;
    overflow: hidden;
}

.user-menu.show {
    display: block;
}

.user-menu-item {
    padding: 10px 16px;
    cursor: pointer;
    font-size: 13px;
    transition: background var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    color: var(--text-primary);
    font-family: inherit;
    text-decoration: none;
    box-sizing: border-box;
}

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

.user-menu-item.danger {
    color: var(--danger-color);
}

/* 版本切换按钮 */
.version-switcher {
    display: flex;
    align-items: center;
    background: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    flex-shrink: 0;
}

.vs-btn {
    padding: 4px 10px;
    font-size: 12px;
    text-decoration: none;
    color: #999;
    background: #fff;
    cursor: pointer;
    transition: all 0.2s;
    line-height: 1.5;
    white-space: nowrap;
    border-right: 1px solid #e0e0e0;
}

.vs-btn:last-child {
    border-right: none;
}

.vs-btn.active {
    color: #1a73e8;
    background: #e8f0fe;
    font-weight: 500;
}

.vs-btn:hover:not(.active) {
    color: #666;
    background: #f5f5f5;
}

/* 分享图片预览弹窗 */
.share-preview-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}

.share-preview-modal {
    background: #fff;
    border-radius: 16px;
    width: 90vw;
    max-width: 600px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.2);
    animation: scaleIn 0.25s ease;
}

.share-preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid #f0f0f0;
}

.share-preview-title {
    font-size: 16px;
    font-weight: 600;
    color: #333;
}

.share-preview-close {
    width: 32px;
    height: 32px;
    border: none;
    background: none;
    font-size: 22px;
    color: #999;
    cursor: pointer;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
}

.share-preview-close:hover {
    background: #f0f0f0;
    color: #333;
}

.share-preview-body {
    padding: 16px 20px;
    overflow-y: auto;
    display: flex;
    justify-content: center;
}

.share-preview-image {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.share-preview-footer {
    display: flex;
    gap: 12px;
    padding: 16px 20px;
    border-top: 1px solid #f0f0f0;
}

.share-preview-btn {
    flex: 1;
    padding: 10px 0;
    border: none;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
}

.share-preview-btn.copy-btn {
    background: #f0f0f0;
    color: #333;
}

.share-preview-btn.copy-btn:hover {
    background: #e0e0e0;
}

.share-preview-btn.download-btn {
    background: linear-gradient(135deg, #7c4dff 0%, #1a73e8 100%);
    color: #fff;
}

.share-preview-btn.download-btn:hover {
    opacity: 0.9;
}

@keyframes scaleIn {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}