:root {
            --font-size: 15px;
            --vh: 1vh;
            /* 圆角体系 */
            --radius-xs: 4px;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 14px;
            --radius-xl: 18px;
            --radius-pill: 999px;
            /* 动画 */
            --transition-base: 0.25s cubic-bezier(.22,1,.36,1);
            --transition-ui: background var(--transition-base), opacity var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
            /* 背景色 */
            --bg-body: #F7F7FB;
            --bg-header: #ffffff;
            --bg-sidebar: #fff;
            --bg-chat: #f8f8f8;
            --bg-input: #fff;
            --bg-bubble-assistant: #ffffff;
            --bg-bubble-user: #7C4DFF;
            --bg-hover: #f0f0f0;
            /* 文字色 */
            --text-primary: #333;
            --text-secondary: #666;
            --text-tertiary: #999;
            --text-user-bubble: white;
            /* 边框色 */
            --border-light: #e0e0e0;
            --border-lighter: #eee;
            /* 阴影 */
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.1);
            --shadow-card: 0 1px 6px rgba(0,0,0,0.04);
            --shadow-elevated: 0 4px 16px rgba(0,0,0,0.06);
            --ring-subtle: 0 0 0 1px rgba(0,0,0,0.06);
            /* 主题色 */
            --accent: #7C4DFF;
            --accent-hover: #5E35B1;
            --accent-glow: rgba(124,77,255,0.15);
            /* 按钮色 */
            --btn-danger: #ff3b30;
            --btn-danger-hover: #cc2f26;
            --btn-warning: #ff9500;
            --btn-warning-hover: #cc7700;
        }
        
        body.dark {
            --bg-body: #1a1a2e;
            --bg-header: #1e1e32;
            --bg-sidebar: #16162a;
            --bg-chat: #1a1a2e;
            --bg-input: #1e1e32;
            --bg-bubble-assistant: #2a2a40;
            --bg-bubble-user: #8B6AFF;
            --bg-hover: #2a2a3a;
            --text-primary: #e0e0e0;
            --text-secondary: #a0a0a0;
            --text-tertiary: #707070;
            --text-user-bubble: #ffffff;
            --border-light: #2a2a3a;
            --border-lighter: #333;
            --shadow-sm: none;
            --shadow-card: 0 1px 6px rgba(0,0,0,0.2);
            --shadow-elevated: 0 4px 16px rgba(0,0,0,0.25);
            --ring-subtle: 0 0 0 1px rgba(255,255,255,0.06);
            --accent: #7C4DFF;
            --accent-hover: #5E35B1;
            --accent-glow: rgba(124,77,255,0.2);
            --btn-danger: #ff5252;
            --btn-danger-hover: #d94444;
            --btn-warning: #ffaa33;
            --btn-warning-hover: #cc8822;
        }
        
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
            background: linear-gradient(180deg, #F8F7FF 0%, #F3F4FA 50%, #F7F7FB 100%);
            background-attachment: fixed;
            height: 100vh;
            height: 100dvh;
            display: flex;
            flex-direction: column;
            overflow: hidden;
        }
        body.dark {
            background: linear-gradient(180deg, #1a1a2e 0%, #1e1e32 50%, #1a1a2e 100%);
            background-attachment: fixed;
        }
        
        /* 简化头部 */
        .header {
            background: rgba(255,255,255,0.72);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            padding: 10px 16px;
            border-bottom: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-shrink: 0;
            box-shadow: 0 1px 0 rgba(0,0,0,0.04);
            gap: 12px;
        }
        
        .header h1 {
            font-size: 16px;
            color: var(--text-primary);
            font-weight: 500;
            flex: 1;
            text-align: center;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        
        .hamburger-btn {
            background: none;
            border: none;
            font-size: 22px;
            cursor: pointer;
            padding: 6px 10px;
            border-radius: var(--radius-md);
            color: var(--text-primary);
            flex-shrink: 0;
            transition: var(--transition-ui);
            line-height: 1;
            min-width: 38px;
            text-align: center;
            opacity: 0.55;
        }

        .hamburger-btn:hover {
            background: var(--bg-hover);
            opacity: 1;
            transform: none;
        }

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

        .new-chat-btn {
            font-size: 24px;
            font-weight: 300;
        }

        /* API 状态指示灯 */
        .api-status-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: #ccc;
            flex-shrink: 0;
            transition: background var(--transition-base), box-shadow var(--transition-base);
        }
        .api-status-dot.online {
            background: #34c759;
            box-shadow: 0 0 8px rgba(52,199,89,0.4);
        }
        .api-status-dot.generating {
            background: var(--accent);
            box-shadow: 0 0 12px var(--accent-glow);
            animation: statusPulse 1.5s ease-in-out infinite;
        }
        @keyframes statusPulse {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.5; transform: scale(1.3); }
        }

        /* 侧边栏遮罩 */
        #sidebarOverlay {
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.4);
            z-index: 1010;
            display: none;
            animation: fadeIn 0.2s;
        }
        
        #sidebarOverlay.show {
            display: block;
        }
        
        /* 侧边栏 */
        #sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: 320px;
            height: 100vh;
            height: 100dvh;
            background: rgba(255,255,255,0.78);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            z-index: 1020;
            display: flex;
            flex-direction: column;
            transform: translateX(-100%);
            transition: transform 0.35s cubic-bezier(.22,1,.36,1);
            box-shadow: 2px 0 24px rgba(0,0,0,0.08);
        }
        body.dark #sidebar {
            background: rgba(26,26,46,0.85);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
        }
        
        #sidebar.open {
            transform: translateX(0);
        }
        
        .sidebar-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 20px;
            box-shadow: 0 1px 0 rgba(0,0,0,0.04);
            font-size: 16px;
            font-weight: 600;
            flex-shrink: 0;
        }
        
        .sidebar-close-btn {
            background: none;
            border: none;
            font-size: 20px;
            cursor: pointer;
            color: var(--text-tertiary);
            padding: 6px 10px;
            border-radius: var(--radius-md);
            transition: var(--transition-ui);
        }

        .sidebar-close-btn:hover {
            color: var(--text-primary);
            background: var(--bg-hover);
        }
        
        .sidebar-scroll {
            flex: 1;
            overflow-y: auto;
            padding: 12px 0;
        }
        
        .sidebar-section {
            padding: 16px 20px;
        }
        
        .sidebar-section-title {
            font-size: calc(var(--font-size) - 5px);
            color: var(--text-tertiary);
            font-weight: 500;
            letter-spacing: 0.5px;
            margin-bottom: 14px;
            opacity: 0.7;
        }
        
        .sidebar-divider {
            height: 1px;
            background: transparent;
            box-shadow: 0 1px 0 rgba(0,0,0,0.04);
            margin: 12px 20px;
            opacity: 0.6;
        }
        
        .sidebar-section input[type="text"] {
            width: 100%;
            padding: 11px 14px;
            border: none;
            border-radius: var(--radius-lg);
            font-size: var(--font-size);
            margin-bottom: 10px;
            background: var(--bg-body);
            box-shadow: 0 2px 10px rgba(0,0,0,.04),
                        inset 0 0 0 1px rgba(0,0,0,.05);
            transition: box-shadow var(--transition-base), background var(--transition-base);
            box-sizing: border-box;
        }

        .sidebar-section input[type="text"]:focus {
            outline: none;
            background: var(--bg-input);
            box-shadow: 0 0 0 3px var(--accent-glow);
        }

        /* API Key 输入框包裹器 */
        .api-key-wrapper {
            position: relative;
            margin-bottom: 8px;
        }
        .api-key-wrapper input[type="password"],
        .api-key-wrapper input[type="text"] {
            width: 100%;
            padding: 11px 36px 11px 14px;
            border: none;
            border-radius: var(--radius-lg);
            font-size: var(--font-size);
            background: var(--bg-body);
            box-shadow: 0 2px 10px rgba(0,0,0,.04),
                        inset 0 0 0 1px rgba(0,0,0,.05);
            transition: box-shadow var(--transition-base), background var(--transition-base);
            box-sizing: border-box;
            color: var(--text-primary);
        }
        .api-key-wrapper input:focus {
            outline: none;
            background: var(--bg-input);
            box-shadow: 0 0 0 3px var(--accent-glow);
        }
        .api-key-toggle {
            position: absolute;
            right: 6px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            font-size: 16px;
            cursor: pointer;
            padding: 4px 6px;
            border-radius: 6px;
            line-height: 1;
            opacity: 0.5;
            transition: opacity 0.2s, background 0.2s;
        }
        .api-key-toggle:hover {
            opacity: 1;
            background: var(--bg-hover);
        }
        .api-key-copy {
            position: absolute;
            right: 34px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            font-size: 14px;
            cursor: pointer;
            padding: 4px 6px;
            border-radius: 6px;
            line-height: 1;
            opacity: 0.5;
            transition: opacity 0.2s, background 0.2s;
        }
        .api-key-copy:hover {
            opacity: 1;
            background: var(--bg-hover);
        }
        .api-key-copy.copied {
            opacity: 1;
            color: #34c759;
        }
        
        .sidebar-section .sidebar-btn {
            width: 100%;
            padding: 9px 14px;
            border: none;
            border-radius: var(--radius-lg);
            font-size: calc(var(--font-size) - 3px);
            cursor: pointer;
            transition: var(--transition-ui);
            margin-bottom: 10px;
            background: var(--accent);
            color: var(--text-user-bubble);
            box-shadow: 0 2px 8px rgba(124,77,255,0.2);
        }

        .sidebar-section .sidebar-btn:hover {
            background: var(--accent-hover);
            transform: translateY(-1px);
            box-shadow: 0 2px 8px rgba(124,77,255,0.2);
        }

        .sidebar-section .sidebar-btn:active {
            transform: translateY(0);
        }
        
        .sidebar-section .sidebar-btn.stop-btn {
            background: var(--btn-warning);
        }

        .sidebar-section .sidebar-btn.stop-btn:hover {
            background: var(--btn-warning-hover);
        }

        /* ===== 侧边栏头部操作按钮 ===== */
        .sidebar-header-actions {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .sidebar-settings-btn {
            background: none;
            border: none;
            font-size: 20px;
            cursor: pointer;
            color: var(--text-tertiary);
            padding: 6px 10px;
            border-radius: var(--radius-md);
            transition: var(--transition-ui);
            line-height: 1;
        }
        .sidebar-settings-btn:hover {
            color: var(--text-primary);
            background: var(--bg-hover);
        }

        /* ===== 设置弹窗 ===== */
        .settings-modal-overlay {
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.45);
            z-index: 1030;
            display: flex;
            align-items: center;
            justify-content: center;
            animation: fadeIn 0.2s;
        }
        .settings-modal {
            background: var(--bg-sidebar);
            border-radius: 16px;
            width: 460px;
            max-width: 92vw;
            max-height: 90vh;
            display: flex;
            flex-direction: column;
            box-shadow: 0 8px 32px rgba(0,0,0,0.18);
            animation: slideUp 0.2s ease-out;
        }
        .settings-modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 20px 12px;
            font-weight: 600;
            font-size: 16px;
            box-shadow: 0 1px 0 rgba(0,0,0,0.04);
            flex-shrink: 0;
        }
        .settings-modal-close {
            background: none;
            border: none;
            font-size: 20px;
            cursor: pointer;
            color: var(--text-tertiary);
            padding: 6px 10px;
            border-radius: var(--radius-md);
            transition: var(--transition-ui);
        }
        .settings-modal-close:hover {
            color: var(--text-primary);
            background: var(--bg-hover);
        }
        .settings-modal-scroll {
            flex: 1;
            overflow-y: auto;
            padding: 16px 20px;
        }
        .settings-section {
            margin-bottom: 24px;
        }
        .settings-section-title {
            font-size: 13px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 12px;
            padding-bottom: 8px;
            border-bottom: 1px solid rgba(0,0,0,0.06);
        }

        /* 设置弹窗内 input/button 镜像 */
        .settings-section input[type="text"],
        .settings-section input[type="password"] {
            width: 100%;
            padding: 11px 14px;
            border: none;
            border-radius: var(--radius-lg);
            font-size: var(--font-size);
            margin-bottom: 10px;
            background: var(--bg-body);
            box-shadow: 0 2px 10px rgba(0,0,0,.04), inset 0 0 0 1px rgba(0,0,0,.05);
            transition: box-shadow var(--transition-base), background var(--transition-base);
            box-sizing: border-box;
        }
        .settings-section input[type="text"]:focus,
        .settings-section input[type="password"]:focus {
            outline: none;
            background: var(--bg-input);
            box-shadow: 0 0 0 3px var(--accent-glow);
        }
        .settings-section .sidebar-btn {
            width: 100%;
            padding: 9px 14px;
            border: none;
            border-radius: var(--radius-lg);
            font-size: calc(var(--font-size) - 3px);
            cursor: pointer;
            transition: var(--transition-ui);
            margin-bottom: 10px;
            background: var(--accent);
            color: var(--text-user-bubble);
            box-shadow: 0 2px 8px rgba(124,77,255,0.2);
        }
        .settings-section .sidebar-btn:hover {
            background: var(--accent-hover);
            transform: translateY(-1px);
        }        .settings-section .sidebar-btn.stop-btn {
            background: var(--btn-warning);
        }
        .settings-section .sidebar-btn.stop-btn:hover {
            background: var(--btn-warning-hover);
        }
        
        /* 主容器 */
        #mainWrapper {
            display: flex;
            flex-direction: column;
            height: 100vh;
            height: 100dvh;
            transition: margin-left 0.35s cubic-bezier(.22,1,.36,1);
        }
        
        /* 聊天消息容器 */
        .chat-messages {
            flex: 1;
            overflow-y: auto;
            padding: 24px;
            display: flex;
            flex-direction: column;
            gap: 20px;
            background: transparent;
            width: 100%;
            max-width: min(900px, 92vw);
            margin: 0 auto;
        }
        
        /* 消息气泡 */
        .message {
            display: flex;
            flex-direction: column;
            max-width: 85%;
            animation: slideIn 0.18s ease-out;
        }

        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateY(4px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .user-message {
            align-self: flex-end;
        }
        
        .assistant-message {
            align-self: flex-start;
            width: 100%;
            max-width: 85%;
        }
        
        .role-label {
            font-size: calc(var(--font-size) - 4px);
            margin-bottom: 6px;
            margin-left: 14px;
            color: var(--text-secondary);
            font-weight: 500;
        }
        
        .msg-time {
            font-size: calc(var(--font-size) - 5px);
            color: var(--text-tertiary);
            margin-left: 6px;
            font-weight: 400;
        }
        .msg-tokens {
            font-size: calc(var(--font-size) - 5px);
            color: var(--text-tertiary);
            margin-left: 4px;
            font-weight: 400;
        }
        
        .user-message .role-label {
            text-align: right;
            margin-right: 12px;
        }
        
        .bubble {
            padding: 14px 18px;
            border-radius: var(--radius-lg);
            word-wrap: break-word;
            font-size: var(--font-size);
            line-height: 1.6;
            position: relative;
        }

        .user-message .bubble {
            background: rgba(124, 77, 255, 0.88);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            color: var(--text-user-bubble);
            border-bottom-right-radius: var(--radius-xs);
            box-shadow: var(--shadow-card);
        }

        .assistant-message .bubble {
            background: rgba(255, 255, 255, 0.72);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            color: var(--text-primary);
            border-bottom-left-radius: var(--radius-xs);
            box-shadow: 0 1px 3px rgba(0,0,0,0.04);
        }
        
        /* Markdown 样式 */
        .bubble h1, .bubble h2, .bubble h3, .bubble h4 {
            margin: 12px 0 6px 0;
            font-weight: 600;
        }
        
        .bubble h1 { font-size: 1.4em; }
        .bubble h2 { font-size: 1.2em; }
        .bubble h3 { font-size: 1.1em; }
        
        .bubble p {
            margin: 6px 0;
        }
        
        .bubble ul, .bubble ol {
            margin: 6px 0;
            padding-left: 20px;
        }
        
        .bubble li {
            margin: 3px 0;
        }
        
        .bubble blockquote {
            border-left: 3px solid var(--accent);
            padding-left: 12px;
            margin: 8px 0;
            color: var(--text-secondary);
        }
        
        .bubble table {
            border-collapse: collapse;
            margin: 8px 0;
            width: 100%;
            font-size: calc(var(--font-size) - 2px);
        }
        
        .bubble th, .bubble td {
            border: 1px solid #ddd;
            padding: 6px 8px;
            text-align: left;
        }
        
        .bubble th {
            background: #f5f5f5;
            font-weight: 600;
        }
        
        .bubble a {
            color: var(--accent);
            text-decoration: none;
        }
        
        .bubble a:hover {
            text-decoration: underline;
        }
        
        /* 代码块容器 */
        .code-block-wrapper {
            position: relative;
            margin: 10px 0;
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: 0 0 0 1px rgba(0,0,0,0.06), 0 2px 8px rgba(0,0,0,0.03);
        }
        
        .code-block-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: var(--bg-hover);
            padding: 6px 12px;
            font-size: calc(var(--font-size) - 3px);
        }
        
        .code-language {
            color: var(--text-secondary);
            font-weight: 500;
        }
        
        .copy-button {
            background: var(--accent);
            color: var(--text-user-bubble);
            border: none;
            padding: 4px 12px;
            border-radius: var(--radius-md);
            cursor: pointer;
            font-size: calc(var(--font-size) - 4px);
            transition: var(--transition-ui);
        }

        .copy-button:hover {
            background: var(--accent-hover);
        }
        
        .copy-button.copied {
            background: #34c759;
        }
        
        .bubble pre {
            margin: 0;
            padding: 12px;
            background: #f8f8f8;
            overflow-x: auto;
            font-size: calc(var(--font-size) - 2px);
            line-height: 1.4;
        }
        
        .bubble code {
            font-family: 'Courier New', Courier, monospace;
            background: #f0f0f0;
            padding: 2px 4px;
            border-radius: 3px;
            font-size: calc(var(--font-size) - 2px);
        }
        
        .bubble pre code {
            background: none;
            padding: 0;
        }
        
        /* 内联代码 */
        .bubble :not(pre) > code {
            background: #f0f0f0;
            color: #e74c3c;
            padding: 2px 6px;
            border-radius: 3px;
            font-size: 0.9em;
        }
        
        /* 消息操作栏 */
        .message-actions {
            display: flex;
            gap: 6px;
            margin-top: 6px;
            margin-left: 14px;
            opacity: 0;
            transition: opacity var(--transition-base);
        }
        
        .assistant-message:hover .message-actions,
        .user-message:hover .message-actions,
        .message-actions.visible {
            opacity: 1;
        }
        
        .regenerate-btn, .edit-btn {
            background: rgba(0,0,0,0.03);
            border: none;
            color: var(--text-secondary);
            padding: 3px 10px;
            border-radius: 12px;
            font-size: calc(var(--font-size) - 4px);
            cursor: pointer;
            transition: all 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 3px;
        }

        .regenerate-btn:hover, .edit-btn:hover {
            background: rgba(124,77,255,0.08);
            color: var(--accent);
        }
        
        .regenerate-btn:disabled, .edit-btn:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }

        /* 版本切换器 */
        .version-switcher {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 6px;
            margin-left: 14px;
            transition: opacity var(--transition-base);
        }
        .version-switcher.single-version {
            display: none;
        }
        .version-btn {
            background: rgba(0,0,0,0.03);
            border: none;
            color: var(--text-secondary);
            width: 26px;
            height: 26px;
            border-radius: 50%;
            font-size: 12px;
            cursor: pointer;
            transition: all 0.2s;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0;
        }
        .version-btn:hover:not(:disabled) {
            background: rgba(124,77,255,0.08);
            color: var(--accent);
        }
        .version-btn:disabled {
            opacity: 0.3;
            cursor: not-allowed;
        }
        .version-counter {
            font-size: calc(var(--font-size) - 3px);
            color: var(--text-tertiary);
            min-width: 32px;
            text-align: center;
            user-select: none;
            cursor: default;
            padding: 2px 4px;
            border-radius: 4px;
            transition: background 0.15s;
        }
        .version-counter:hover {
            background: rgba(0,0,0,0.04);
        }
        .version-delete-btn {
            background: none;
            border: none;
            color: var(--text-tertiary);
            font-size: 11px;
            cursor: pointer;
            padding: 2px 4px;
            border-radius: 4px;
            opacity: 0;
            transition: all 0.2s;
        }
        .version-switcher:hover .version-delete-btn,
        .assistant-message:hover .version-delete-btn {
            opacity: 0.5;
        }
        .version-delete-btn:hover {
            opacity: 1 !important;
            color: var(--btn-danger);
            background: rgba(255,59,48,0.08);
        }
        /* 暗色模式适配 */
        body.dark .version-btn {
            background: rgba(255,255,255,0.04);
        }
        body.dark .version-btn:hover:not(:disabled) {
            background: rgba(124,77,255,0.15);
        }
        body.dark .version-counter:hover {
            background: rgba(255,255,255,0.04);
        }
        body.dark .version-delete-btn:hover {
            background: rgba(255,59,48,0.15);
        }
        /* 移动端版本切换器 */
        @media (max-width: 600px) {
            .version-switcher {
                gap: 4px;
                margin-left: 10px;
            }
            .version-switcher.single-version {
                display: none;
            }
            .version-btn {
                width: 30px;
                height: 30px;
                font-size: 14px;
            }
            .version-delete-btn {
                opacity: 0.5;
            }
        }

        /* AI消息编辑态 */
        .bubble.editing {
            border: 2px solid var(--accent);
            background: var(--bg-bubble-assistant);
            padding: 10px;
        }
        
        .edit-textarea {
            width: 100%;
            min-height: 80px;
            font-size: var(--font-size);
            line-height: 1.6;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            border: none;
            box-shadow: var(--ring-subtle);
            border-radius: 12px;
            padding: 8px;
            resize: vertical;
            background: var(--bg-input);
            color: var(--text-primary);
        }
        
        .edit-textarea:focus {
            outline: none;
            box-shadow: 0 0 0 2px rgba(124,77,255,0.25);
        }
        
        .edit-actions {
            display: flex;
            gap: 6px;
            margin-top: 8px;
        }
        
        .edit-actions button {
            font-size: calc(var(--font-size) - 4px);
            padding: 4px 12px;
            border-radius: 12px;
            border: none;
            box-shadow: var(--ring-subtle);
            cursor: pointer;
            transition: all 0.15s;
        }
        
        .edit-save-btn {
            background: var(--accent);
            color: var(--text-user-bubble);
            box-shadow: 0 0 0 1px var(--accent);
        }
        
        .edit-save-btn:hover {
            background: var(--accent-hover);
        }
        
        .edit-cancel-btn {
            background: var(--bg-input);
            color: var(--text-secondary);
        }
        
        .edit-cancel-btn:hover {
            background: var(--bg-hover);
        }
        
        /* ===== 头像系统样式 ===== */
        .avatar-icon {
            border-radius: 50%;
            object-fit: cover;
            flex-shrink: 0;
        }
        
        .avatar-header {
            width: 28px;
            height: 28px;
            vertical-align: middle;
            margin-right: 2px;
            cursor: pointer;
            transition: var(--transition-ui);
        }
        .avatar-header:hover {
            transform: scale(1.1);
        }
        
        .avatar-settings {
            width: 32px;
            height: 32px;
        }
        
        .avatar-preview-large {
            width: 48px;
            height: 48px;
        }
        
        /* 设置栏头像预览 */
        .avatar-preview-wrapper {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            border: 2px dashed var(--border-light);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            flex-shrink: 0;
            transition: border-color 0.2s, background 0.2s;
            background: #fafafa;
            position: relative;
            overflow: hidden;
        }
        
        .avatar-preview-wrapper:hover {
            border-color: var(--accent);
            background: #f0f6ff;
        }
        
        .avatar-preview-wrapper .avatar-icon {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
        }
        
        .avatar-placeholder {
            font-size: 18px;
            line-height: 1;
        }
        
        /* 头像 + 名称水平行 */
        .partner-row {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 8px;
        }
        
        .partner-row .avatar-preview-wrapper {
            margin-bottom: 0;
        }
        
        /* 角色标签中的头像 */
        .label-avatar {
            display: inline-block;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            vertical-align: middle;
            margin-right: 2px;
            background-size: cover;
            background-position: center;
            background-color: #e0e0e0;
        }
        
        .label-avatar.has-avatar {
            background-color: transparent;
        }
        
        /* 弹窗遮罩 */
        .avatar-modal-overlay {
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.45);
            z-index: 1000;
            display: flex;
            align-items: center;
            justify-content: center;
            animation: fadeIn 0.2s;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        
        /* 弹窗盒 */
        .avatar-modal {
            background: var(--bg-sidebar);
            border-radius: 16px;
            width: 420px;
            max-width: 92vw;
            max-height: 85vh;
            display: flex;
            flex-direction: column;
            box-shadow: 0 8px 32px rgba(0,0,0,0.18);
            animation: slideUp 0.2s ease-out;
        }
        
        @keyframes slideUp {
            from { opacity: 0; transform: translateY(8px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .avatar-modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 20px 12px;
            font-weight: 600;
            font-size: 16px;
            box-shadow: 0 1px 0 rgba(0,0,0,0.04);
        }
        
        .avatar-modal-close {
            background: none;
            border: none;
            font-size: 18px;
            cursor: pointer;
            color: var(--text-tertiary);
            padding: 4px 8px;
            border-radius: 4px;
            transition: color 0.2s;
        }
        
        .avatar-modal-close:hover {
            color: var(--text-primary);
        }
        
        /* 选项卡 */
        .avatar-modal-tabs {
            display: flex;
            box-shadow: 0 1px 0 rgba(0,0,0,0.04);
            padding: 0 20px;
            gap: 4px;
        }
        
        .avatar-tab {
            background: none;
            border: none;
            padding: 10px 16px;
            font-size: 13px;
            cursor: pointer;
            color: var(--text-secondary);
            border-bottom: 2px solid transparent;
            transition: color 0.2s, border-color 0.2s;
            margin-bottom: -1px;
        }
        
        .avatar-tab:hover {
            color: var(--accent);
        }
        
        .avatar-tab.active {
            color: var(--accent);
            border-bottom-color: var(--accent);
            font-weight: 500;
        }
        
        /* 面板 */
        .avatar-modal-body {
            padding: 16px 20px;
            overflow-y: auto;
            flex: 1;
        }
        
        .avatar-panel {
            display: none;
        }
        
        .avatar-panel.active {
            display: block;
        }
        
        /* 上传区 */
        .avatar-upload-zone {
            border: 2px dashed var(--border-light);
            border-radius: 12px;
            padding: 28px 16px;
            text-align: center;
            cursor: pointer;
            transition: border-color 0.2s, background 0.2s;
            color: #888;
        }
        
        .avatar-upload-zone:hover {
            border-color: var(--accent);
            background: #f8faff;
        }
        
        .avatar-upload-zone.drag-over {
            border-color: var(--accent);
            background: #eef4ff;
        }
        
        .upload-icon {
            font-size: 36px;
            display: block;
            margin-bottom: 8px;
        }
        
        .avatar-upload-zone p {
            margin: 0;
            font-size: 13px;
        }
        
        /* URL 输入 */
        .avatar-url-input {
            width: 100%;
            padding: 8px 12px;
            border: none;
            box-shadow: var(--ring-subtle);
            border-radius: 8px;
            font-size: 13px;
            margin-bottom: 8px;
            transition: border-color 0.2s;
        }
        
        .avatar-url-input:focus {
            outline: none;
            box-shadow: 0 0 0 2px rgba(124,77,255,0.25);
        }
        
        .avatar-url-preview-btn {
            background: var(--bg-hover);
            border: none;
            box-shadow: var(--ring-subtle);
            padding: 6px 16px;
            border-radius: 6px;
            font-size: 12px;
            cursor: pointer;
            transition: background 0.2s;
        }
        
        .avatar-url-preview-btn:hover {
            background: var(--border-light);
        }
        
        /* 预览区 */
        .avatar-preview-area {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 12px 0 0;
            border-top: 1px solid rgba(128,128,128,0.1);
            margin-top: 12px;
            font-size: 14px;
            color: var(--text-primary);
        }
        
        /* 弹窗底部 */
        .avatar-modal-footer {
            display: flex;
            justify-content: flex-end;
            gap: 8px;
            padding: 12px 20px 16px;
            box-shadow: 0 -1px 0 rgba(0,0,0,0.04);
        }
        
        .avatar-btn-cancel,
        .avatar-btn-confirm {
            padding: 8px 20px;
            border-radius: 8px;
            font-size: 14px;
            cursor: pointer;
            transition: background 0.2s;
        }
        
        .avatar-btn-cancel {
            background: var(--bg-hover);
            border: none;
            box-shadow: var(--ring-subtle);
            color: var(--text-secondary);
        }
        
        .avatar-btn-cancel:hover {
            background: var(--border-light);
        }
        
        .avatar-btn-confirm {
            background: var(--accent);
            border: none;
            color: var(--text-user-bubble);
            font-weight: 500;
        }
        
        .avatar-btn-confirm:hover {
            background: var(--accent-hover);
        }
        
        /* 历史头像 */
        .avatar-history-section {
            margin-top: 12px;
            padding-top: 10px;
            border-top: 1px solid rgba(128,128,128,0.1);
        }
        
        .avatar-history-label {
            font-size: 12px;
            color: #888;
            margin-bottom: 8px;
            font-weight: 500;
        }
        
        .avatar-history-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        
        .avatar-history-item {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            cursor: pointer;
            position: relative;
            border: 2px solid transparent;
            transition: border-color 0.2s, transform 0.15s;
            flex-shrink: 0;
            overflow: visible;
        }
        
        .avatar-history-item:hover {
            border-color: #7C4DFF;
            transform: scale(1.1);
        }
        
        .avatar-history-item.selected {
            border-color: #7C4DFF;
            box-shadow: 0 0 0 2px rgba(124,77,255,0.25);
        }
        
        .avatar-history-item img {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            object-fit: cover;
        }
        
        .avatar-history-delete {
            position: absolute;
            top: -4px;
            right: -4px;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background: #ff3b30;
            color: #fff;
            border: none;
            font-size: 10px;
            line-height: 16px;
            text-align: center;
            cursor: pointer;
            display: none;
            z-index: 2;
        }
        
        .avatar-history-item:hover .avatar-history-delete {
            display: block;
        }
        
        /* 手机适配 */
        @media (max-width: 600px) {
            .avatar-modal {
                width: 100%;
                max-width: 100%;
                height: 100%;
                max-height: 100%;
                border-radius: 0;
            }
            
            .avatar-modal-body {
                flex: 1;
            }
            
            .avatar-header {
                width: 24px;
                height: 24px;
            }
            
            .avatar-settings {
                width: 28px;
                height: 28px;
            }
            
            .avatar-preview-wrapper {
                width: 32px;
                height: 32px;
            }
        }
        
        /* 光标闪烁动画 */
        .cursor-blink {
            display: inline-block;
            width: 2px;
            height: 18px;
            background-color: #7C4DFF;
            margin-left: 2px;
            animation: blink 1s infinite;
            vertical-align: middle;
        }
        
        @keyframes blink {
            0%, 50% { opacity: 1; }
            51%, 100% { opacity: 0; }
        }
        
        /* 输入区域 */
        .input-area {
            position: relative;
            z-index: 50;
            background: rgba(255, 255, 255, 0.65);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            padding: 12px 16px;
            border-top: none;
            display: flex;
            gap: 10px;
            align-items: center;
            flex-shrink: 0;
            box-shadow: 0 -2px 20px rgba(0,0,0,0.04);
        }

        .input-area textarea {
            flex: 1;
            border: none;
            border-radius: var(--radius-xl);
            padding: 12px 18px;
            font-size: var(--font-size);
            font-family: inherit;
            resize: none;
            max-height: 100px;
            background: var(--bg-body);
            box-shadow: 0 2px 12px rgba(0,0,0,0.04), inset 0 0 0 1px rgba(0,0,0,0.04);
            transition: box-shadow var(--transition-base), background var(--transition-base);
        }

        .input-area textarea:focus {
            outline: none;
            background: var(--bg-input);
            box-shadow: 0 0 0 3px rgba(124,77,255,0.08), 0 8px 32px rgba(124,77,255,0.06);
            transform: translateY(-1px);
        }

        .input-area button {
            background: linear-gradient(135deg, #7C4DFF, #9F6BFF);
            color: var(--text-user-bubble);
            border: none;
            padding: 12px 22px;
            border-radius: var(--radius-xl);
            font-size: var(--font-size);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition-ui);
            white-space: nowrap;
            box-shadow: 0 2px 8px rgba(124,77,255,0.2);
        }

        .input-area button:hover {
            background: linear-gradient(135deg, #6A3DE8, #8B5AF0);
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(124,77,255,0.25);
        }

        .input-area button:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(124,77,255,0.3);
        }

        /* 输入焦点态 — 页面级沉浸感 */
        body.input-focus .chat-messages {
            opacity: 0.92;
            transition: opacity 0.4s;
        }
        body.input-focus .header {
            opacity: 0.7;
            transition: opacity 0.4s;
        }
        body.input-focus #sidebar {
            opacity: 0.8;
            transition: opacity 0.4s;
        }

        /* 输入展开遮罩 */
        .input-expand-overlay {
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.3);
            z-index: 40;
            display: none;
        }
        
        .input-expand-overlay.show {
            display: block;
        }
        
        /* 一键滚到底部按钮 */
        #scrollBottomBtn {
            position: fixed;
            bottom: 100px;
            right: 16px;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--accent);
            color: #fff;
            border: none;
            font-size: 20px;
            cursor: pointer;
            z-index: 60;
            display: none;
            transition: var(--transition-ui);
            line-height: 40px;
            text-align: center;
            padding: 0;
            box-shadow: 0 2px 8px rgba(124,77,255,0.2);
        }

        #scrollBottomBtn:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(124,77,255,0.25);
        }
        
        #scrollBottomBtn:active {
            transform: scale(0.9);
        }
        
        .input-area button:disabled {
            background: var(--border-light);
            box-shadow: none;
            cursor: not-allowed;
            color: var(--text-tertiary);
        }
        .input-area button:disabled:hover {
            transform: none;
            box-shadow: none;
        }
        
        /* 模型切换按钮组 */
        .model-toggle {
            display: flex;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: none;
            box-shadow: 0 0 0 1px rgba(0,0,0,0.06);
            flex-shrink: 0;
            opacity: 0.55;
            transition: opacity 0.2s;
        }
        .model-toggle:hover {
            opacity: 1;
        }

        .model-toggle .mt-option {
            padding: 5px 10px;
            font-size: 11px;
            border: none;
            cursor: pointer;
            background: var(--bg-input);
            color: var(--text-secondary);
            transition: var(--transition-ui);
            white-space: nowrap;
            font-weight: 500;
        }
        
        .model-toggle .mt-option:first-child {
            border-right: 1px solid var(--border-light);
        }
        
        .model-toggle .mt-option.active {
            background: var(--accent);
            color: var(--text-user-bubble);
        }
        
        .model-toggle .mt-option:not(.active):hover {
            background: var(--bg-hover);
        }

        #sidebarModelToggle {
            width: 100%;
        }
        #sidebarModelToggle .mt-option {
            flex: 1;
            text-align: center;
        }

        /* Temperature 滑块 */
        .temp-slider-container {
            margin-bottom: 14px;
        }
        
        .temp-label {
            font-size: 11px;
            color: var(--text-secondary);
            margin-bottom: 4px;
            text-align: center;
            transition: color 0.2s;
            white-space: nowrap;
        }
        
        .temp-slider-container input[type="range"] {
            width: 100%;
            -webkit-appearance: none;
            appearance: none;
            height: 8px;
            background: linear-gradient(90deg,var(--accent),#B388FF);
            border-radius: 999px;
            outline: none;
            cursor: pointer;
            margin: 0;
        }
        
        .temp-slider-container input[type="range"]::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 22px;
            height: 22px;
            background: var(--bg-input);
            border-radius: 50%;
            cursor: pointer;
            border: 2px solid var(--accent);
            box-shadow: 0 4px 12px rgba(124,77,255,.3);
        }
        
        .temp-slider-container input[type="range"]::-moz-range-thumb {
            width: 22px;
            height: 22px;
            background: var(--bg-input);
            border-radius: 50%;
            cursor: pointer;
            border: 2px solid var(--accent);
            box-shadow: 0 4px 12px rgba(124,77,255,.3);
        }
        
        /* 回复长度下拉 */
        .max-tokens-container {
            margin-bottom: 14px;
        }
        
        .max-tokens-container label {
            font-size: 11px;
            color: var(--text-tertiary);
            display: block;
            margin-bottom: 4px;
        }
        
        .max-tokens-container select {
            width: 100%;
            padding: 6px 8px;
            border: none;
            box-shadow: var(--ring-subtle);
            border-radius: 12px;
            font-size: 12px;
            box-sizing: border-box;
            background: var(--bg-input);
        }

        /* 高级设置折叠区 */
        .sidebar-advanced-settings {
            margin-bottom: 10px;
            box-shadow: var(--ring-subtle);
            border-radius: 14px;
            overflow: hidden;
        }
        .sidebar-advanced-summary {
            padding: 10px 14px;
            font-size: 12px;
            color: var(--text-secondary);
            cursor: pointer;
            user-select: none;
            list-style: none;
            transition: background var(--transition-base);
        }
        .sidebar-advanced-summary::-webkit-details-marker {
            display: none;
        }
        .sidebar-advanced-summary:hover {
            background: var(--bg-hover);
            color: var(--accent);
        }
        .sidebar-advanced-summary::before {
            content: '▸';
            display: inline-block;
            margin-right: 6px;
            font-size: 10px;
            transition: transform var(--transition-base);
        }
        .sidebar-advanced-settings[open] .sidebar-advanced-summary::before {
            transform: rotate(90deg);
        }
        .sidebar-advanced-body {
            padding: 6px 14px 12px;
        }
        
        /* 深度思考开关 - 使用ID选择器提升特异性，防止被.input-area button覆盖 */
        #thinkToggleBtn {
            display: flex;
            align-items: center;
            gap: 4px;
            cursor: pointer;
            flex-shrink: 0;
            user-select: none;
            padding: 4px !important;
            border-radius: 20px !important;
            transition: background 0.2s;
            border: none;
            background: transparent !important;
            color: inherit !important;
            font-weight: normal !important;
            font-size: inherit !important;
            outline: none;
            font-family: inherit;
            white-space: nowrap;
            min-width: auto;
            line-height: 1;
        }
        
        #thinkToggleBtn:hover {
            background: var(--bg-hover) !important;
        }
        
        #thinkToggleBtn:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: -2px;
        }
        
        .think-track {
            width: 36px;
            height: 20px;
            border-radius: 10px;
            background: #ccc;
            position: relative;
            transition: background 0.25s;
            flex-shrink: 0;
        }
        
        .think-toggle-on .think-track {
            background: var(--accent);
        }
        
        .think-thumb {
            position: absolute;
            top: 2px;
            left: 2px;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background: #fff;
            box-shadow: 0 1px 3px rgba(0,0,0,0.2);
            transition: left 0.25s;
        }
        
        .think-toggle-on .think-thumb {
            left: 18px;
        }
        
        .think-label {
            font-size: 16px;
            line-height: 1;
        }
        
        /* 思考过程折叠块 */
        .reasoning-block {
            margin-bottom: 10px;
            border: none;
            border-radius: 8px;
            overflow: hidden;
            background: #fef9f0;
            box-shadow: 0 0 0 1px rgba(232, 213, 183, 0.5), 0 1px 3px rgba(0,0,0,0.03);
        }
        
        .reasoning-header {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 12px;
            cursor: pointer;
            user-select: none;
            font-size: 13px;
            color: #8b7355;
            transition: background 0.15s;
        }
        
        .reasoning-header:hover {
            background: #fdf3e3;
        }
        
        .reasoning-arrow {
            display: inline-block;
            transition: transform 0.2s;
            font-size: 11px;
            font-family: monospace;
        }
        
        .reasoning-arrow.open {
            transform: rotate(90deg);
        }
        
        .reasoning-content {
            padding: 0 12px 10px 12px;
            font-size: 12px;
            color: #8b7355;
            line-height: 1.6;
            border-top: 1px solid #e8d5b7;
        }
        
        .reasoning-content p {
            margin: 6px 0;
        }
        
        .reasoning-content pre {
            background: #f5ead5;
            border: 1px solid #e0d0b0;
            font-size: 11px;
        }
        
        .reasoning-content code {
            background: #f5ead5;
            font-size: 11px;
        }
        
        .reasoning-content pre code {
            background: transparent;
        }

        /* ===== 垂直对话列表（侧边栏内） ===== */
        .conv-list {
            display: flex;
            flex-direction: column;
            gap: 2px;
            margin-bottom: 8px;
        }
        
        .conv-item {
            padding: 10px 12px;
            border-radius: 16px;
            cursor: pointer;
            font-size: 13px;
            color: var(--text-primary);
            transition: background 0.15s;
            display: flex;
            align-items: flex-start;
            user-select: none;
            position: relative;
        }
        
        .conv-text {
            flex: 1;
            min-width: 0;
            overflow: hidden;
        }
        
        .conv-title {
            font-weight: 500;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            display: block;
        }
        
        .conv-item.active .conv-title {
            font-weight: 600;
        }
        
        .conv-summary {
            font-size: 11px;
            color: var(--text-tertiary);
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            display: block;
            margin-top: 2px;
        }
        
        .conv-item.active .conv-summary {
            color: var(--text-secondary);
        }

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

        .conv-item.active {
            background: rgba(124,77,255,.08);
            color: var(--text-primary);
            font-weight: 500;
            box-shadow: inset 3px 0 0 var(--accent);
        }
        
        .conv-item .conv-delete {
            font-size: 14px;
            color: var(--text-tertiary);
            padding: 2px 6px;
            border-radius: 4px;
            flex-shrink: 0;
            display: none;
            margin-left: 6px;
        }
        
        .conv-item:hover .conv-delete {
            display: block;
        }
        
        .conv-item .conv-delete:hover {
            color: #ff3b30;
            background: rgba(0,0,0,0.08);
        }
        
        .conv-new-btn {
            width: 100%;
            padding: 8px;
            border: none;
            box-shadow: var(--ring-subtle);
            border-radius: 16px;
            background: transparent;
            font-size: 13px;
            color: var(--accent);
            cursor: pointer;
            transition: all 0.2s;
            margin-bottom: 8px;
        }
        
        .conv-new-btn:hover {
            background: #e8f0ff;
            box-shadow: 0 0 0 1px var(--accent);
        }

        .status {
            font-size: 11px;
            padding: 6px 12px;
            color: var(--text-tertiary);
            background: transparent;
            text-align: center;
            flex-shrink: 0;
            border-top: none;
            opacity: 0.8;
        }
        
        /* 侧边栏响应式：桌面端推挤布局 */
        @media (min-width: 601px) {
            #mainWrapper.sidebar-open {
                margin-left: 320px;
            }
        }
        
        /* 移动端响应式 */
        @media (max-width: 600px) {
            #sidebar {
                width: 85vw;
            }
            
            #mainWrapper {
                margin-left: 0 !important;
            }
            
            .header h1 {
                font-size: 14px;
            }

            .message {
                animation-duration: 0.14s;
            }
            @keyframes slideIn {
                from { opacity: 0; transform: translateY(2px); }
                to { opacity: 1; transform: translateY(0); }
            }
            
            /* 🧠 深度思考按钮缩小 */
            #thinkToggleBtn {
                width: 28px;
                height: 28px;
                min-width: 28px;
                justify-content: center;
            }
            #thinkToggleBtn .think-track {
                display: none;
            }
            /* 开启状态：emoji 变紫色 */
            .think-toggle-on .think-label {
                filter: grayscale(0);
            }
            .think-toggle-off .think-label {
                filter: grayscale(1);
            }
            
            /* ↑ 发送按钮缩小为圆形 */
            #sendBtn {
                width: 36px;
                height: 36px;
                padding: 0 !important;
                border-radius: 50%;
                font-size: 18px;
                min-width: 36px;
            }
            
            /* 输入框过渡 */
            #userInput {
                transition: height 0.2s;
            }
            
            /* 输入框展开态 */
            .input-area.expanded textarea {
                height: 80px;
            }
            
            /* 滚底按钮位置适配 */
            #scrollBottomBtn {
                bottom: 90px;
                right: 10px;
            }

            .chat-messages {
                max-width: 100vw;
                padding: 16px 12px;
            }
        }
        
        /* ===== AI角色中心（新UI） ===== */
        
        /* 模块头部 */
        .sp-header-new {
            display: flex;
            align-items: flex-start;
            justify-content: space-between;
            gap: 8px;
            margin-bottom: 12px;
        }
        .sp-header-left {
            min-width: 0;
            flex: 1;
        }
        .sp-title-new {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-primary);
            display: block;
        }
        .sp-subtitle-new {
            font-size: 11px;
            color: var(--text-tertiary);
            display: block;
            margin-top: 2px;
        }
        /* 新建模板按钮 */
        .sp-new-tmpl-btn {
            flex-shrink: 0;
            height: 30px;
            padding: 0 12px;
            border-radius: 12px;
            border: none;
            box-shadow: var(--ring-subtle);
            background: rgba(255,255,255,.6);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            font-size: 11px;
            font-weight: 600;
            color: var(--accent);
            cursor: pointer;
            transition: all .2s;
            white-space: nowrap;
            margin-top: 2px;
        }
        .sp-new-tmpl-btn:hover {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 0 0 1px var(--accent);
        }
        
        /* ===== 当前角色卡片（核心） ===== */
        .sp-current-role-card {
            background: var(--bg-bubble-assistant);
            border-radius: var(--radius-lg);
            padding: 16px;
            box-shadow: var(--shadow-card), 0 0 0 1px rgba(0,0,0,0.03);
            border: none;
            margin-bottom: 14px;
            transition: var(--transition-ui);
        }
        .sp-current-role-card.has-role {
            background: linear-gradient(135deg,#7C4DFF,#9F6BFF);
            color: #fff;
            border-color: transparent;
            box-shadow: 0 4px 16px rgba(124,77,255,.18);
        }
        /* 展示区 */
        .sp-cr-display {
            display: block;
        }
        .sp-cr-name {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 4px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        .sp-current-role-card:not(.has-role) .sp-cr-name {
            color: var(--text-tertiary);
        }
        .sp-current-role-card.has-role .sp-cr-name {
            color: #fff;
        }
        .sp-cr-desc {
            font-size: 12px;
            color: var(--text-tertiary);
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 10px;
            min-height: 18px;
        }
        .sp-current-role-card.has-role .sp-cr-desc {
            color: rgba(255,255,255,.7);
        }
        .sp-cr-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .sp-cr-badge {
            font-size: 10px;
            font-weight: 600;
            color: #22c55e;
            flex-shrink: 0;
        }
        .sp-cr-btn {
            height: 30px;
            padding: 0 12px;
            border-radius: 8px;
            border: none;
            box-shadow: var(--ring-subtle);
            font-size: 12px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition-ui);
            color: var(--text-secondary);
            background: var(--bg-input);
        }
        .sp-cr-btn:hover {
            background: var(--bg-hover);
            color: var(--accent);
            box-shadow: 0 0 0 1px var(--accent);
        }
        .sp-current-role-card.has-role .sp-cr-badge {
            color: #a5f3c4;
        }
        .sp-current-role-card.has-role .sp-cr-btn {
            color: #fff;
            background: rgba(255,255,255,.2);
            box-shadow: 0 0 0 1px rgba(255,255,255,.25);
        }
        .sp-current-role-card.has-role .sp-cr-btn:hover {
            background: rgba(255,255,255,.35);
            color: #fff;
            box-shadow: 0 0 0 1px rgba(255,255,255,.4);
        }
        /* 编辑区 */
        .sp-cr-editor {
            display: block;
        }
        .sp-cr-name-input {
            width: 100%;
            padding: 8px 10px;
            margin-bottom: 8px;
            border: none;
            box-shadow: var(--ring-subtle);
            border-radius: 10px;
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
            background: var(--bg-input);
            box-sizing: border-box;
            transition: box-shadow .2s;
        }
        .sp-cr-name-input:focus {
            outline: none;
            box-shadow: 0 0 0 2px rgba(124,77,255,.25);
        }
        .sp-cr-editor textarea {
            width: 100%;
            min-height: 100px;
            padding: 10px 12px;
            border: none;
            box-shadow: var(--ring-subtle);
            border-radius: 10px;
            font-size: 12px;
            font-family: inherit;
            line-height: 1.7;
            resize: vertical;
            box-sizing: border-box;
            background: var(--bg-input);
            color: var(--text-primary);
            transition: box-shadow .2s;
        }
        .sp-cr-editor textarea:focus {
            outline: none;
            box-shadow: 0 0 0 2px rgba(124,77,255,.25);
        }
        .sp-cr-editor-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-top: 8px;
        }
        .sp-cr-editor-actions {
            display: flex;
            gap: 8px;
        }
        .sp-cr-cancel-btn {
            height: 32px;
            padding: 0 14px;
            border-radius: 12px;
            border: none;
            box-shadow: var(--ring-subtle);
            font-size: 11px;
            font-weight: 600;
            cursor: pointer;
            background: var(--bg-input);
            color: var(--text-secondary);
            transition: var(--transition-ui);
        }
        .sp-cr-cancel-btn:hover {
            background: var(--bg-hover);
        }
        
        /* ===== 角色卡片网格 ===== */
        .sp-role-cards-label {
            font-size: 10px;
            color: var(--text-tertiary);
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 8px;
        }
        .sp-role-cards-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 14px;
        }
        .sp-role-card {
            background: rgba(255,255,255,.72);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-radius: 16px;
            padding: 10px 14px;
            cursor: pointer;
            transition: all .3s cubic-bezier(.22,1,.36,1);
            border: none;
            box-shadow: 0 0 0 1px rgba(0,0,0,0.04), 0 2px 8px rgba(0,0,0,0.03);
            position: relative;
            min-width: 0;
            flex: 1 1 calc(50% - 4px);
            max-width: calc(50% - 4px);
            box-sizing: border-box;
        }
        .sp-role-card:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 30px rgba(124,77,255,.12), 0 0 0 1px rgba(124,77,255,0.15);
        }
        .sp-role-card.active {
            background: linear-gradient(135deg,#7C4DFF,#9F6BFF);
            color: #fff;
            border-color: transparent;
            cursor: default;
        }
        .sp-role-card.active:hover {
            transform: none;
            box-shadow: 0 10px 30px rgba(124,77,255,.18);
        }
        .sp-role-card-name {
            font-size: 12px;
            font-weight: 600;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        .sp-role-card .sp-card-menu-btn {
            position: absolute;
            top: 6px;
            right: 8px;
            background: none;
            border: none;
            font-size: 14px;
            cursor: pointer;
            color: var(--text-tertiary);
            padding: 2px 4px;
            border-radius: 6px;
            line-height: 1;
            opacity: 0;
            transition: opacity .15s, background .15s;
        }
        .sp-role-card:hover .sp-card-menu-btn {
            opacity: 1;
        }
        .sp-role-card .sp-card-menu-btn:hover {
            background: rgba(0,0,0,.08);
        }
        .sp-role-card.active .sp-card-menu-btn {
            color: rgba(255,255,255,.7);
        }
        .sp-role-card.active .sp-card-menu-btn:hover {
            background: rgba(255,255,255,.15);
        }
        
        /* ===== 弹出菜单（卡片操作） ===== */
        .sp-popup-menu {
            position: fixed;
            z-index: 1050;
            background: #fff;
            border-radius: 14px;
            box-shadow: 0 10px 30px rgba(0,0,0,.12);
            padding: 6px 0;
            min-width: 120px;
            animation: spMenuIn .15s ease-out;
        }
        @keyframes spMenuIn {
            from { opacity: 0; transform: scale(.9); }
            to { opacity: 1; transform: scale(1); }
        }
        .sp-popup-menu-item {
            display: block;
            width: 100%;
            padding: 8px 16px;
            border: none;
            background: none;
            font-size: 12px;
            cursor: pointer;
            text-align: left;
            color: var(--text-primary);
            transition: background .1s;
            white-space: nowrap;
        }
        .sp-popup-menu-item:hover {
            background: var(--bg-hover);
        }
        .sp-popup-menu-item.danger {
            color: #ff3b30;
        }
        .sp-popup-menu-overlay {
            position: fixed;
            inset: 0;
            z-index: 1045;
        }

        /* ===== 移动端底部操作面板（长按菜单） ===== */
        .msg-bottom-sheet-overlay {
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.35);
            z-index: 1050;
            display: flex;
            align-items: flex-end;
            justify-content: center;
            animation: fadeIn 0.2s;
        }
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        .msg-bottom-sheet {
            background: var(--bg-sidebar);
            border-radius: 20px 20px 0 0;
            width: 100%;
            max-width: 100vw;
            max-height: 60vh;
            overflow-y: auto;
            padding: 8px 0 20px;
            box-shadow: 0 -4px 24px rgba(0,0,0,0.12);
            animation: sheetSlideUp 0.3s cubic-bezier(.22,1,.36,1);
            z-index: 1051;
        }
        @keyframes sheetSlideUp {
            from { transform: translateY(100%); }
            to { transform: translateY(0); }
        }

        .msg-bottom-sheet-section {
            padding: 4px 20px;
        }
        .msg-bottom-sheet-title {
            font-size: 11px;
            color: var(--text-tertiary);
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            padding: 8px 0 4px;
        }
        .msg-bottom-sheet-item {
            display: flex;
            align-items: center;
            width: 100%;
            padding: 14px 20px;
            border: none;
            background: none;
            font-size: 15px;
            cursor: pointer;
            text-align: left;
            color: var(--text-primary);
            transition: background 0.15s;
            border-radius: 12px;
            margin: 2px 0;
        }
        .msg-bottom-sheet-item:hover,
        .msg-bottom-sheet-item:active {
            background: var(--bg-hover);
        }
        .msg-bottom-sheet-item.danger {
            color: var(--btn-danger);
        }
        .msg-bottom-sheet-cancel {
            display: flex;
            align-items: center;
            justify-content: center;
            width: calc(100% - 40px);
            margin: 8px 20px 0;
            padding: 14px;
            border: none;
            background: var(--bg-hover);
            border-radius: 14px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            color: var(--text-secondary);
            transition: background 0.15s;
        }
        .msg-bottom-sheet-cancel:hover,
        .msg-bottom-sheet-cancel:active {
            background: var(--border-light);
        }
        body.dark .msg-bottom-sheet {
            background: rgba(26,26,46,0.97);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
        }

        /* ===== 规则卡面板 ===== */
        .rules-panel-overlay {
            position: fixed;
            inset: 0;
            z-index: 960;
            background: transparent;
        }
        .rules-panel {
            position: fixed;
            top: 56px;
            right: 16px;
            width: 380px;
            max-width: calc(100vw - 32px);
            max-height: 70vh;
            background: var(--bg-sidebar);
            border-radius: var(--radius-lg);
            box-shadow: 0 8px 32px rgba(0,0,0,0.14);
            z-index: 965;
            display: flex;
            flex-direction: column;
            overflow: hidden;
            animation: slideUp 0.2s ease-out;
        }
        .rules-panel-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 16px;
            border-bottom: 1px solid rgba(128,128,128,0.1);
            flex-shrink: 0;
        }
        .rules-panel-title {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
        }
        .rules-panel-close {
            background: none;
            border: none;
            font-size: 18px;
            cursor: pointer;
            color: var(--text-tertiary);
            padding: 4px;
            border-radius: var(--radius-xs);
            transition: var(--transition-ui);
        }
        .rules-panel-close:hover {
            background: var(--bg-hover);
            color: var(--text-primary);
        }
        .rules-panel-body {
            flex: 1;
            overflow-y: auto;
            padding: 8px 12px;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }
        .rules-panel-footer {
            padding: 8px 16px 12px;
            border-top: 1px solid rgba(128,128,128,0.1);
            flex-shrink: 0;
        }

        /* 规则添加行 */
        .rules-add-row {
            display: flex;
            gap: 8px;
            padding: 8px 12px;
            border-bottom: 1px solid rgba(128,128,128,0.1);
            flex-shrink: 0;
            align-items: flex-start;
        }
        .rules-add-row.hidden {
            display: none;
        }
        .rules-add-input {
            flex: 1;
            padding: 8px 12px;
            border: none;
            box-shadow: var(--ring-subtle);
            border-radius: var(--radius-md);
            font-size: 13px;
            font-family: inherit;
            background: var(--bg-input);
            color: var(--text-primary);
            resize: none;
            min-height: 36px;
            max-height: 72px;
            transition: box-shadow 0.2s;
        }
        .rules-add-input:focus {
            outline: none;
            box-shadow: 0 0 0 2px rgba(124,77,255,0.25);
        }
        .rules-add-input.warn {
            box-shadow: 0 0 0 2px rgba(255,149,0,0.2);
        }
        .rules-add-actions {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2px;
            flex-shrink: 0;
        }
        .rules-add-confirm,
        .rules-add-cancel {
            background: none;
            border: none;
            cursor: pointer;
            font-size: 16px;
            padding: 4px;
            border-radius: var(--radius-xs);
            transition: background 0.15s;
            line-height: 1;
        }
        .rules-add-confirm:hover {
            background: rgba(52,199,89,0.15);
        }
        .rules-add-cancel:hover {
            background: rgba(255,59,48,0.12);
        }
        .rules-char-hint {
            font-size: 10px;
            color: var(--text-tertiary);
            text-align: center;
        }
        .rules-char-hint.warn {
            color: var(--btn-warning);
            font-weight: 600;
        }

        /* 添加规则按钮 */
        .rules-add-btn {
            width: 100%;
            padding: 8px;
            border: none;
            box-shadow: var(--ring-subtle);
            border-radius: var(--radius-md);
            background: none;
            cursor: pointer;
            color: var(--text-secondary);
            font-size: 13px;
            font-family: inherit;
            transition: box-shadow 0.2s, color 0.2s, background 0.2s;
        }
        .rules-add-btn:hover {
            box-shadow: 0 0 0 1px var(--accent);
            color: var(--accent);
            background: rgba(124,77,255,0.04);
        }
        .rules-add-btn:disabled {
            opacity: 0.35;
            cursor: not-allowed;
            box-shadow: var(--ring-subtle);
            color: var(--text-tertiary);
        }

        /* 规则卡片 */
        .rule-card {
            background: var(--bg-input);
            box-shadow: var(--ring-subtle);
            border-radius: var(--radius-md);
            transition: box-shadow 0.2s, opacity 0.2s;
            cursor: pointer;
            user-select: none;
        }
        .rule-card:hover {
            box-shadow: 0 0 0 1px var(--accent), 0 2px 8px rgba(0,0,0,0.06);
        }
        .rule-card.expanded {
            box-shadow: 0 0 0 1px var(--accent), 0 2px 8px rgba(0,0,0,0.06);
        }
        .rule-card.dragging {
            opacity: 0.4;
        }
        .rule-card.drag-over {
            box-shadow: 0 0 0 2px var(--accent), 0 4px 12px rgba(124,77,255,0.12);
            background: rgba(124,77,255,0.04);
        }
        .rule-card.disabled {
            opacity: 0.5;
        }
        .rule-card.disabled .rule-card-number {
            color: var(--text-tertiary);
        }
        .rule-card.disabled .rule-card-summary {
            text-decoration: line-through;
            color: var(--text-tertiary);
        }

        /* 卡片头部 */
        .rule-card-header {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 10px;
            min-height: 40px;
        }
        .rule-card-drag-handle {
            display: inline-block;
            cursor: grab;
            padding: 0 4px;
            color: var(--text-tertiary);
            font-size: 12px;
            opacity: 0.5;
            transition: opacity 0.2s;
            flex-shrink: 0;
        }
        .rule-card:hover .rule-card-drag-handle {
            opacity: 1;
        }
        .rule-card-number {
            font-size: 11px;
            font-weight: 700;
            color: var(--accent);
            min-width: 18px;
            flex-shrink: 0;
        }
        .rule-card-summary {
            flex: 1;
            font-size: 13px;
            color: var(--text-primary);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            line-height: 1.3;
        }

        /* 卡片操作按钮 */
        .rule-card-actions {
            display: flex;
            gap: 2px;
            flex-shrink: 0;
            opacity: 0;
            transition: opacity 0.2s;
        }
        .rule-card:hover .rule-card-actions {
            opacity: 1;
        }
        .rule-card-action-btn {
            background: none;
            border: none;
            cursor: pointer;
            padding: 3px 6px;
            font-size: 13px;
            border-radius: var(--radius-xs);
            color: var(--text-tertiary);
            transition: background 0.15s, color 0.15s;
            line-height: 1;
        }
        .rule-card-action-btn:hover {
            background: var(--bg-hover);
            color: var(--text-primary);
        }
        .rule-card-action-btn.toggle-off {
            opacity: 0.4;
        }
        .rule-card-action-btn.delete-btn:hover {
            background: rgba(255,59,48,0.12);
            color: var(--btn-danger);
        }

        /* 展开内容区 */
        .rule-card-body {
            display: none;
            padding: 0 10px 10px 10px;
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.5;
            white-space: pre-wrap;
            word-break: break-word;
        }
        .rule-card.expanded .rule-card-body {
            display: block;
        }

        /* 编辑模式 */
        .rule-card-edit-input {
            width: 100%;
            padding: 6px 8px;
            border: none;
            box-shadow: 0 0 0 1px var(--accent);
            border-radius: var(--radius-sm);
            font-size: 13px;
            font-family: inherit;
            background: var(--bg-input);
            color: var(--text-primary);
            resize: vertical;
            min-height: 48px;
            box-sizing: border-box;
        }
        .rule-card-edit-input.warn {
            box-shadow: 0 0 0 1px var(--btn-warning);
        }
        .rule-card-edit-actions {
            display: flex;
            justify-content: flex-end;
            gap: 6px;
            margin-top: 6px;
        }
        .rule-card-edit-save,
        .rule-card-edit-cancel {
            padding: 4px 12px;
            border-radius: var(--radius-sm);
            border: none;
            font-size: 12px;
            cursor: pointer;
            font-family: inherit;
            transition: background 0.15s;
        }
        .rule-card-edit-save {
            background: var(--accent);
            color: #fff;
        }
        .rule-card-edit-save:hover {
            background: var(--accent-hover);
        }
        .rule-card-edit-cancel {
            background: var(--bg-hover);
            color: var(--text-secondary);
        }
        .rule-card-edit-cancel:hover {
            background: var(--border-light);
        }

        /* 编辑器共享元素 */
        .sp-char-count {
            font-size: 10px;
            color: var(--text-tertiary);
        }
        .sp-save-btn {
            height: 32px;
            padding: 0 14px;
            border-radius: 12px;
            border: none;
            font-size: 11px;
            font-weight: 600;
            cursor: pointer;
            background: var(--accent);
            color: #fff;
            transition: var(--transition-ui);
        }
        .sp-save-btn:hover {
            background: var(--accent-hover);
        }
        
        /* ===== 预览卡片（覆盖层） ===== */
        .sp-preview-overlay {
            position: fixed;
            inset: 0;
            z-index: 1060;
            background: rgba(0,0,0,.3);
            display: flex;
            align-items: center;
            justify-content: center;
            animation: fadeIn .2s;
        }
        .sp-preview-card {
            background: var(--bg-sidebar);
            border-radius: 20px;
            padding: 20px;
            width: 90%;
            max-width: 340px;
            max-height: 70vh;
            overflow-y: auto;
            box-shadow: 0 20px 50px rgba(0,0,0,.15);
            animation: slideUp .25s ease-out;
        }
        .sp-preview-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 6px;
        }
        .sp-preview-content {
            font-size: 12px;
            color: var(--text-secondary);
            line-height: 1.7;
            background: var(--bg-chat);
            border-radius: 12px;
            padding: 12px;
            margin: 10px 0;
            max-height: 35vh;
            overflow-y: auto;
            white-space: pre-wrap;
            word-wrap: break-word;
        }
        .sp-preview-actions {
            display: flex;
            gap: 8px;
            justify-content: flex-end;
            margin-top: 12px;
        }
        .sp-preview-btn {
            height: 36px;
            padding: 0 18px;
            border-radius: 14px;
            border: none;
            font-size: 13px;
            font-weight: 600;
            cursor: pointer;
            transition: all .2s;
        }
        .sp-preview-btn.primary {
            background: linear-gradient(135deg,#7C4DFF,#9F6BFF);
            color: #fff;
        }
        .sp-preview-btn.primary:hover {
            transform: translateY(-1px);
            box-shadow: 0 4px 16px rgba(124,77,255,.3);
        }
        .sp-preview-btn.cancel {
            background: var(--bg-hover);
            color: var(--text-secondary);
        }
        .sp-preview-btn.cancel:hover {
            background: var(--border-light);
        }

        /* ===== 多答案并列容器（嵌入聊天流中，已废弃，保留样式作为内层） ===== */
        .multi-answer-container {
            margin: 8px 0;
            border-radius: 14px;
            overflow: hidden;
            background: var(--bg-bubble-assistant);
            box-shadow: 0 2px 12px rgba(0,0,0,0.08);
        }

        .multi-answer-label {
            font-size: 11px;
            color: var(--text-tertiary);
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            padding: 10px 14px 6px;
        }

        .answer-sub-item {
            border-bottom: 1px solid rgba(128,128,128,0.1);
        }
        .answer-sub-item:last-child {
            border-bottom: none;
        }

        .answer-header {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 10px 14px;
            cursor: pointer;
            user-select: none;
            transition: background 0.15s;
            min-height: 44px;
        }
        .answer-header:hover {
            background: var(--bg-chat);
        }

        .answer-letter {
            font-size: 18px;
            flex-shrink: 0;
            line-height: 1;
        }

        .answer-label-text {
            font-size: 13px;
            font-weight: 600;
            color: var(--text-primary);
            flex-shrink: 0;
        }

        .answer-preview {
            flex: 1;
            font-size: 12px;
            color: var(--text-tertiary);
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            min-width: 0;
        }

        .answer-arrow {
            font-size: 14px;
            color: #bbb;
            transition: transform 0.25s;
            flex-shrink: 0;
            display: inline-block;
        }
        .answer-arrow.open {
            transform: rotate(90deg);
        }

        .answer-body {
            display: none;
            padding: 0 14px 12px 14px;
            border-top: 1px solid rgba(128,128,128,0.1);
            overflow-y: auto;
            font-size: 14px;
            line-height: 1.6;
            color: var(--text-primary);
        }
        .answer-body.open {
            display: block;
        }

        .answer-content-area {
            min-height: 20px;
        }

        .answer-select-btn {
            display: inline-block;
            margin-top: 10px;
            padding: 7px 20px;
            background: var(--accent);
            color: var(--text-user-bubble);
            border: none;
            border-radius: 18px;
            font-size: 13px;
            font-weight: 500;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
        }
        .answer-select-btn:hover {
            background: var(--accent-hover);
        }
        .answer-select-btn:active {
            transform: scale(0.97);
        }

        /* 多答案内的 reasoning block（与现有思考块样式保持一致但更紧凑） */
        .answer-body .reasoning-block {
            margin-bottom: 8px;
        }
        .answer-body .reasoning-content {
            font-size: 11px;
        }

        /* 多答案错误提示 */
        .answer-error-msg {
            color: #ff3b30;
            font-size: 13px;
            padding: 8px 0;
        }

        /* 多答案移动端适配 */
        @media (max-width: 600px) {
            .multi-answer-container {
                margin: 4px 0;
                border-radius: 10px;
            }
            .answer-header {
                padding: 8px 10px;
                gap: 6px;
                min-height: 40px;
            }
            .answer-letter {
                font-size: 16px;
            }
            .answer-label-text {
                font-size: 12px;
            }
            .answer-preview {
                font-size: 11px;
            }
            .answer-body {
                max-height: 320px;
                padding: 0 10px 10px 10px;
                font-size: 13px;
            }
            .answer-select-btn {
                padding: 6px 16px;
                font-size: 12px;
            }
        }

        /* 多答案固定面板（悬浮在输入框上方，始终可见） */
        .multi-answer-panel {
            position: fixed;
            bottom: 84px;
            left: 16px;
            right: 16px;
            max-width: 85%;
            margin: 0 auto;
            max-height: 42vh;
            overflow-y: auto;
            z-index: 50;
            background: var(--bg-bubble-assistant);
            box-shadow: 0 -4px 20px rgba(0,0,0,0.15);
            border-radius: 14px;
            animation: panelSlideUp 0.25s ease-out;
        }
        @keyframes panelSlideUp {
            from { opacity: 0; transform: translateY(12px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .multi-answer-panel .multi-answer-container {
            margin: 0;
            border: none;
            border-radius: 0;
            box-shadow: none;
        }
        /* 移动端：面板更紧凑 */
        @media (max-width: 600px) {
            .multi-answer-panel {
                bottom: 74px;
                left: 8px;
                right: 8px;
                max-width: 100%;
                max-height: 38vh;
                border-radius: 10px;
            }
        }
        
        /* ===== 暗色模式切换按钮 ===== */
        .dark-toggle {
            display: flex;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: none;
            box-shadow: 0 0 0 1px rgba(0,0,0,0.06);
            margin-bottom: 12px;
            flex-shrink: 0;
        }
        .dark-toggle .dt-option {
            flex: 1;
            padding: 7px 10px;
            font-size: 13px;
            border: none;
            cursor: pointer;
            background: var(--bg-input);
            color: var(--text-secondary);
            transition: var(--transition-ui);
            white-space: nowrap;
            text-align: center;
        }
        .dark-toggle .dt-option:first-child {
            border-right: 1px solid var(--border-light);
        }
        .dark-toggle .dt-option.active {
            background: var(--accent);
            color: var(--text-user-bubble);
        }
        .dark-toggle .dt-option:not(.active):hover {
            background: var(--bg-hover);
        }
        
        
        /* ===== 滚动条美化 ===== */
        ::-webkit-scrollbar {
            width: 6px;
        }
        
        ::-webkit-scrollbar-thumb {
            background: rgba(124,77,255,.25);
            border-radius: 999px;
        }
        
        ::-webkit-scrollbar-thumb:hover {
            background: rgba(124,77,255,.4);
        }
        
        ::-webkit-scrollbar-track {
            background: transparent;
        }
        
        /* 移动端字体默认稍大 */
        @media (max-width: 600px) {
            :root {
                --font-size: 16px;
            }
            /* 新建模板按钮缩小 */
            .sp-new-tmpl-btn {
                height: 28px;
                padding: 0 8px;
                font-size: 14px;
                border-radius: 10px;
                min-width: 28px;
            }
            .settings-modal {
                width: 100%;
                max-width: 100%;
                max-height: 100vh;
                max-height: 100dvh;
                border-radius: 0;
            }
            .settings-modal-scroll {
                padding: 12px 16px;
            }
        }

        /* ===== AI 群聊系统 ===== */

        /* 群聊开关按钮 */
        .group-chat-toggle {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            border: 2px solid var(--border-light);
            background: var(--bg-input);
            font-size: 16px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition-ui);
            flex-shrink: 0;
            padding: 0;
            margin-right: 4px;
            opacity: 0.6;
        }
        .group-chat-toggle:hover {
            opacity: 1;
            border-color: var(--accent);
        }
        .group-chat-toggle.active {
            opacity: 1;
            border-color: var(--accent);
            background: var(--accent);
            color: #fff;
            box-shadow: 0 0 8px rgba(124,77,255,.3);
        }

        /* 角色栏 */
        .roster-bar {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 6px 12px;
            background: var(--bg-header);
            border-bottom: 1px solid var(--border-lighter);
            flex-wrap: wrap;
            min-height: 36px;
            z-index: 49;
            position: relative;
        }
        .roster-bar-label {
            font-size: 11px;
            color: var(--text-tertiary);
            white-space: nowrap;
            font-weight: 500;
        }
        .roster-bar-list {
            display: flex;
            gap: 4px;
            flex-wrap: wrap;
        }
        .roster-chip {
            display: inline-flex;
            align-items: center;
            gap: 3px;
            padding: 2px 8px;
            border-radius: var(--radius-pill);
            background: var(--bg-hover);
            font-size: 11px;
            cursor: pointer;
            transition: var(--transition-ui);
            border: 1px solid transparent;
            user-select: none;
            white-space: nowrap;
        }
        .roster-chip:hover {
            border-color: var(--accent);
        }
        .roster-chip.disabled {
            opacity: 0.4;
            text-decoration: line-through;
        }
        .roster-chip.muted {
            background: rgba(245,158,11,.15);
            border-color: rgba(245,158,11,.4);
        }

        /* 群聊状态栏 */
        .group-status-bar {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 6px 14px;
            background: linear-gradient(135deg, rgba(124,77,255,.08), rgba(255,107,107,.08));
            border-bottom: 1px solid var(--border-lighter);
            font-size: 12px;
            font-weight: 500;
            animation: gcStatusPulse 1.5s ease-in-out infinite;
        }
        @keyframes gcStatusPulse {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.7; }
        }
        .gc-status-icon {
            font-size: 16px;
        }
        .gc-status-text {
            transition: color 0.3s;
        }
        .gc-mode-tag {
            margin-left: auto;
            padding: 1px 8px;
            border-radius: var(--radius-pill);
            background: var(--accent);
            color: #fff;
            font-size: 10px;
            font-weight: 600;
        }

        /* 群聊消息气泡 */
        .group-message {
            border-left: 3px solid var(--ai-color, #888) !important;
            padding-left: 8px !important;
            margin-left: 4px !important;
            transition: border-color 0.3s;
        }
        .group-message.group-round-compact {
            margin-bottom: 4px !important;
        }
        .group-message.group-round-last {
            margin-bottom: 16px !important;
        }
        .group-role-label {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .group-ai-avatar {
            font-size: 16px;
            line-height: 1;
            cursor: pointer;
            transition: var(--transition-ui);
        }
        .group-ai-avatar:hover {
            transform: scale(1.15);
        }
        .roster-chip-avatar {
            cursor: pointer;
            transition: var(--transition-ui);
        }
        .roster-chip-avatar:hover {
            transform: scale(1.2);
        }
        .group-bubble {
            background: color-mix(in srgb, var(--ai-color, #888) 8%, var(--bg-bubble-assistant)) !important;
            border: 1px solid color-mix(in srgb, var(--ai-color, #888) 18%, transparent) !important;
        }
        .group-message-actions {
            border-top: 1px solid color-mix(in srgb, var(--ai-color, #888) 12%, transparent);
            padding-top: 6px;
            margin-top: 4px;
        }
        .mute-btn.muted {
            color: #f59e0b !important;
            font-weight: 600;
            background: rgba(245,158,11,.12) !important;
        }
        /* 轮次分组线 */
        .message[data-round-id] + .message:not([data-round-id]) {
            border-top: 1px dashed var(--border-light);
            padding-top: 12px;
            margin-top: 8px;
        }

        /* 轮次操作栏 */
        .round-actions-bar {
            display: flex;
            justify-content: flex-start;
            padding: 2px 0 12px 0;
        }
        .round-regenerate-btn {
            padding: 3px 12px;
            border: none;
            border-radius: var(--radius-xs);
            background: transparent;
            color: var(--text-tertiary);
            font-size: 11px;
            cursor: pointer;
            transition: var(--transition-ui);
        }
        .round-regenerate-btn:hover {
            color: var(--text-secondary);
            background: var(--bg-hover);
        }

        /* 角色管理面板 */
        .roster-mode-row {
            display: flex;
            align-items: center;
            gap: 8px;
            margin: 8px 0;
            padding: 6px 10px;
            background: var(--bg-hover);
            border-radius: var(--radius-sm);
        }
        .roster-mode-label {
            font-size: 11px;
            color: var(--text-tertiary);
            white-space: nowrap;
        }
        .roster-mode-select {
            flex: 1;
            padding: 4px 8px;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            font-size: 11px;
            background: var(--bg-input);
            color: var(--text-primary);
        }
        .roster-items {
            display: flex;
            flex-direction: column;
            gap: 4px;
            margin: 8px 0;
        }
        .roster-item {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 8px 10px;
            background: var(--bg-hover);
            border-radius: var(--radius-sm);
            transition: var(--transition-ui);
        }
        .roster-item:hover {
            background: var(--bg-body);
        }
        .roster-item-avatar {
            font-size: 20px;
            flex-shrink: 0;
        }
        .roster-item-info {
            flex: 1;
            min-width: 0;
            display: flex;
            flex-direction: column;
            gap: 1px;
        }
        .roster-item-name {
            font-size: 13px;
            font-weight: 600;
            color: var(--text-primary);
        }
        .roster-item-desc {
            font-size: 10px;
            color: var(--text-tertiary);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .roster-item-rels {
            display: flex;
            gap: 3px;
            margin-top: 2px;
        }
        .rost-rel-tag {
            font-size: 9px;
            padding: 1px 5px;
            border-radius: var(--radius-pill);
            background: var(--bg-input);
            white-space: nowrap;
        }
        .roster-item-toggle {
            display: flex;
            align-items: center;
            gap: 4px;
            font-size: 10px;
            color: var(--text-tertiary);
            white-space: nowrap;
        }
        .roster-item-toggle input {
            width: 14px;
            height: 14px;
            accent-color: var(--accent);
        }
        .roster-item-edit, .roster-item-del {
            width: 26px;
            height: 26px;
            border: none;
            border-radius: var(--radius-xs);
            background: transparent;
            cursor: pointer;
            font-size: 12px;
            transition: var(--transition-ui);
        }
        .roster-item-edit:hover { background: var(--accent); color: #fff; }
        .roster-item-del:hover { background: #FF6B6B; color: #fff; }

        /* 角色编辑器 */
        .roster-editor {
            padding: 10px;
            background: var(--bg-hover);
            border-radius: var(--radius-md);
            margin: 8px 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .roster-edit-name, .roster-edit-avatar {
            width: 100%;
            padding: 6px 10px;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            font-size: 13px;
            background: var(--bg-input);
            color: var(--text-primary);
            box-sizing: border-box;
        }
        .roster-edit-color {
            width: 40px;
            height: 30px;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-xs);
            padding: 2px;
            cursor: pointer;
        }
        .roster-edit-color-row {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .roster-edit-color-row input[type=range] {
            flex: 1;
        }
        .roster-edit-prompt {
            width: 100%;
            padding: 8px 10px;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            font-size: 12px;
            background: var(--bg-input);
            color: var(--text-primary);
            resize: vertical;
            box-sizing: border-box;
            font-family: inherit;
        }
        .roster-edit-actions {
            display: flex;
            gap: 8px;
            justify-content: flex-end;
        }
        .roster-edit-save, .roster-edit-cancel {
            padding: 6px 14px;
            border: none;
            border-radius: var(--radius-sm);
            font-size: 12px;
            cursor: pointer;
            font-weight: 500;
        }
        .roster-edit-save { background: var(--accent); color: #fff; }
        .roster-edit-cancel { background: var(--bg-input); color: var(--text-secondary); border: 1px solid var(--border-light); }

        .rost-rel-edit-row {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 11px;
            padding: 2px 0;
        }
        .rost-rel-slider {
            flex: 1;
            accent-color: var(--accent);
        }
        .rost-rel-val {
            font-size: 10px;
            width: 30px;
            text-align: right;
            font-variant-numeric: tabular-nums;
        }

        /* 移动端群聊适配 */
        @media (max-width: 600px) {
            .roster-bar {
                padding: 4px 8px;
                gap: 4px;
            }
            .roster-chip {
                padding: 2px 6px;
                font-size: 10px;
            }
            .group-chat-toggle {
                width: 32px;
                height: 32px;
                font-size: 14px;
            }
            .group-message {
                padding-left: 6px !important;
                margin-left: 2px !important;
            }
            .roster-item {
                flex-wrap: wrap;
            }
            .roster-item-edit, .roster-item-del {
                width: 32px;
                height: 32px;
                font-size: 14px;
            }
        }

        /* ===== 暗色模式专用覆盖 ===== */
        body.dark .bubble pre {
            background: #1e1e2e;
        }
        body.dark .bubble code {
            background: #2a2a3e;
        }
        body.dark .bubble :not(pre) > code {
            background: #2a2a3e;
        }
        body.dark .bubble th {
            background: #252540;
        }
        body.dark .bubble th, body.dark .bubble td {
            border-color: #3a3a50;
        }
        body.dark .code-block-header {
            background: var(--bg-hover);
        }
        body.dark .assistant-message .bubble {
            background: rgba(42, 42, 64, 0.75);
        }
        body.dark .user-message .bubble {
            background: rgba(139, 106, 255, 0.85);
        }
        body.dark .input-area {
            background: rgba(30, 30, 50, 0.75);
        }
        body.dark .header {
            background: rgba(30,30,50,0.72);
        }
        body.dark .header h1 {
            color: #d0d0d0;
        }
        body.dark .hamburger-btn {
            color: #b0b0b0;
        }
        body.dark .hamburger-btn:hover {
            color: #e0e0e0;
        }
        body.dark .rules-panel {
            background: #1e1e32;
            box-shadow: 0 8px 32px rgba(0,0,0,0.35);
        }
        body.dark .sidebar-divider {
            box-shadow: 0 1px 0 rgba(255,255,255,0.04);
        }
        body.dark .regenerate-btn, body.dark .edit-btn {
            background: rgba(255,255,255,0.05);
        }
        body.dark .reasoning-block {
            background: #2a2a20;
            box-shadow: 0 0 0 1px rgba(74, 74, 48, 0.5), 0 1px 3px rgba(0,0,0,0.1);
        }
        body.dark .reasoning-header {
            color: #c0b090;
        }
        body.dark .reasoning-header:hover {
            background: #3a3a28;
        }
        body.dark .reasoning-content {
            color: #c0b090;
            border-top-color: #4a4a30;
        }
        body.dark .reasoning-content pre,
        body.dark .reasoning-content code {
            background: #3a3a28;
            border-color: #4a4a30;
        }
        body.dark .conv-new-btn:hover {
            background: #2a2a3a;
        }
        body.dark .answer-error-msg {
            color: #ff6b6b;
        }
        body.dark .avatar-preview-wrapper {
            background: #2a2a3a;
        }
        body.dark .avatar-preview-wrapper:hover {
            background: #2a2a40;
        }
        body.dark .avatar-upload-zone:hover {
            background: #2a2a3a;
        }
        body.dark .avatar-upload-zone.drag-over {
            background: #2a2a3a;
        }
        body.dark .label-avatar {
            background-color: #3a3a50;
        }
        body.dark .input-area button:disabled {
            background: #3a3a4a;
            box-shadow: none;
            color: #777;
        }
        body.dark #thinkToggleBtn .think-track {
            background: #555;
        }
        body.dark .api-key-wrapper input {
            background: #1e1e32;
            color: #e0e0e0;
        }
        
        /* AI角色中心暗色适配 */
        body.dark .sp-current-role-card {
            background: rgba(30,30,50,.8);
            box-shadow: var(--shadow-card), 0 0 0 1px rgba(255,255,255,0.04);
        }
        body.dark .sp-current-role-card.has-role {
            background: linear-gradient(135deg,#7C4DFF,#9F6BFF);
            box-shadow: var(--shadow-card), 0 0 0 1px transparent;
        }
        body.dark .sp-cr-btn {
            background: rgba(255,255,255,.06);
            color: #a0a0a0;
            border-color: rgba(255,255,255,.08);
        }
        body.dark .sp-cr-btn:hover {
            background: rgba(255,255,255,.1);
            color: var(--accent);
        }
        body.dark .sp-cr-name-input {
            background: #1e1e32;
            border-color: #2a2a3a;
            color: #e0e0e0;
        }
        body.dark .sp-cr-editor textarea {
            background: #1e1e32;
            border-color: #2a2a3a;
        }
        body.dark .sp-cr-cancel-btn {
            background: rgba(255,255,255,.06);
            color: #a0a0a0;
            border-color: rgba(255,255,255,.08);
        }
        body.dark .sp-cr-cancel-btn:hover {
            background: rgba(255,255,255,.1);
            color: #e0e0e0;
        }
        body.dark .sp-role-card {
            background: rgba(30,30,50,.8);
            box-shadow: 0 0 0 1px rgba(255,255,255,0.04), 0 2px 8px rgba(0,0,0,0.1);
        }
        body.dark .sp-role-card:hover {
            box-shadow: 0 10px 30px rgba(124,77,255,.12), 0 0 0 1px rgba(124,77,255,0.3);
        }
        body.dark .sp-role-card.active {
            background: linear-gradient(135deg,#7C4DFF,#9F6BFF);
        }
        body.dark .sidebar-advanced-settings {
            border-color: rgba(255,255,255,.06);
        }
        body.dark .sidebar-advanced-summary:hover {
            background: rgba(255,255,255,.04);
        }
        body.dark .settings-section-title {
            border-bottom-color: rgba(255,255,255,0.06);
        }
        body.dark .sp-popup-menu {
            background: #2a2a40;
            box-shadow: 0 10px 30px rgba(0,0,0,.4);
        }
        body.dark .sp-popup-menu-item {
            color: #e0e0e0;
        }
        body.dark .sp-popup-menu-item:hover {
            background: #3a3a50;
        }
        body.dark .sp-preview-card {
            background: #1e1e32;
        }
        body.dark .sp-preview-content {
            background: #16162a;
        }
        body.dark .sp-new-tmpl-btn {
            background: rgba(30,30,50,.8);
            border-color: rgba(255,255,255,.08);
        }
        
        
        /* 暗色模式滚动条 */
        body.dark ::-webkit-scrollbar-thumb {
            background: rgba(160,160,200,.35);
        }
        body.dark ::-webkit-scrollbar-thumb:hover {
            background: rgba(160,160,200,.55);
        }

        /* 群聊暗色适配 */
        body.dark .group-chat-toggle {
            border-color: #444;
            background: #2a2a3e;
        }
        body.dark .group-chat-toggle:hover {
            border-color: var(--accent);
        }
        body.dark .roster-bar {
            background: #1e1e2e;
            border-color: #333;
        }
        body.dark .group-status-bar {
            background: linear-gradient(135deg, rgba(124,77,255,.12), rgba(255,107,107,.12));
            border-color: #333;
        }
        body.dark .roster-chip {
            background: #2a2a3e;
        }
        body.dark .group-bubble {
            background: color-mix(in srgb, var(--ai-color, #888) 12%, #1e1e2e) !important;
            border-color: color-mix(in srgb, var(--ai-color, #888) 25%, transparent) !important;
        }
        body.dark .group-message-actions {
            border-top-color: color-mix(in srgb, var(--ai-color, #888) 15%, #333);
        }
        body.dark .roster-item {
            background: #2a2a3e;
        }
        body.dark .roster-item:hover {
            background: #333;
        }
        body.dark .roster-editor {
            background: #2a2a3e;
        }
        body.dark .roster-edit-name,
        body.dark .roster-edit-avatar,
        body.dark .roster-edit-prompt,
        body.dark .roster-mode-select {
            background: #1e1e2e;
            color: #e0e0e0;
            border-color: #444;
        }
        body.dark .roster-item-edit:hover { background: var(--accent); color: #fff; }
        body.dark .roster-item-del:hover { background: #FF6B6B; color: #fff; }
        body.dark .rost-rel-tag {
            background: #1e1e2e;
        }
        body.dark .roster-mode-row {
            background: #2a2a3e;
        }
        body.dark .round-regenerate-btn {
            background: transparent;
            color: #555;
        }
        body.dark .round-regenerate-btn:hover {
            color: #999;
            background: #2a2a3e;
        }

/* ===== 长篇文章写作 ===== */

/* 弹窗遮罩 */
.la-modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-body);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    animation: fadeIn 0.2s;
}

.la-modal {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;
    width: 100%;
}

/* 顶部栏 */
.la-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    background: var(--bg-header);
    box-shadow: 0 1px 0 rgba(0,0,0,0.04), var(--shadow-card);
    flex-shrink: 0;
}

.la-title {
    flex: 1;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.la-close-btn {
    background: none;
    border: none;
    font-size: 22px;
    cursor: pointer;
    color: var(--text-tertiary);
    padding: 6px 10px;
    border-radius: var(--radius-md);
    transition: var(--transition-ui);
}

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

/* 主体区域 */
.la-body {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* 左侧章节导航 */
.la-chapter-nav {
    width: 220px;
    flex-shrink: 0;
    box-shadow: 1px 0 0 rgba(0,0,0,0.04);
    background: var(--bg-sidebar);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.la-chapter-nav-title {
    padding: 12px 16px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(128,128,128,0.1);
}

.la-chapter-nav-list {
    display: flex;
    flex-direction: column;
}

.la-chapter-nav-item {
    padding: 10px 16px;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(128,128,128,0.1);
    transition: background 0.15s, color 0.15s, box-shadow 0.15s;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

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

.la-chapter-nav-item.active {
    color: var(--accent);
    font-weight: 600;
    background: rgba(124,77,255,.06);
    box-shadow: inset 3px 0 0 var(--accent);
}

.la-chapter-nav-item.completed {
    color: #34c759;
}

.la-chapter-nav-item.generating {
    color: var(--accent);
}

@keyframes laPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.la-chapter-nav-item.generating::after {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
    margin-left: 6px;
    vertical-align: middle;
    animation: laPulse 1s ease-in-out infinite;
}

/* 主内容区 */
.la-main {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}

/* Phase 0 / Welcome */
.la-welcome {
    max-width: 600px;
    margin: 60px auto;
    text-align: center;
}

.la-welcome h2 {
    font-size: 24px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.la-welcome p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 12px;
}

.la-hint {
    font-size: 12px;
    color: var(--text-tertiary);
    font-style: italic;
}

/* Phase 1: Input */
.la-input-section {
    max-width: 600px;
    margin: 40px auto;
}

.la-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    margin-top: 20px;
}

.la-topic-input {
    width: 100%;
    padding: 12px 16px;
    border: none;
    box-shadow: var(--ring-subtle);
    border-radius: var(--radius-md);
    font-size: var(--font-size);
    font-family: inherit;
    resize: vertical;
    background: var(--bg-input);
    color: var(--text-primary);
    transition: box-shadow 0.2s;
    box-sizing: border-box;
}
.la-topic-input:focus {
    outline: none;
    box-shadow: 0 0 0 2px rgba(124,77,255,.25);
}

.la-system-prompt-input {
    width: 100%;
    padding: 12px 16px;
    border: none;
    box-shadow: var(--ring-subtle);
    border-radius: var(--radius-md);
    font-size: var(--font-size);
    font-family: inherit;
    resize: vertical;
    background: var(--bg-input);
    color: var(--text-primary);
    transition: box-shadow 0.2s;
    box-sizing: border-box;
    min-height: 60px;
}
.la-system-prompt-input:focus {
    outline: none;
    box-shadow: 0 0 0 2px rgba(124,77,255,.25);
}
.la-body-prompt-section {
    max-width: 600px;
    margin: 0 auto;
}
.la-body-prompt-section h3 {
    margin-bottom: 12px;
}

.la-template-select {
    width: 100%;
    padding: 12px 16px;
    border: none;
    box-shadow: var(--ring-subtle);
    border-radius: var(--radius-md);
    font-size: var(--font-size);
    font-family: inherit;
    background: var(--bg-input);
    color: var(--text-primary);
    transition: box-shadow 0.2s;
    box-sizing: border-box;
    cursor: pointer;
    appearance: auto;
}
.la-template-select:focus {
    outline: none;
    box-shadow: 0 0 0 2px rgba(124,77,255,.25);
}

.la-chapter-view {
    margin-top: 16px;
    padding: 24px;
    background: var(--bg-card);
    box-shadow: var(--shadow-card);
    border-radius: var(--radius-md);
    min-height: 200px;
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-primary);
}
.la-chapter-view-content {
    word-wrap: break-word;
}
.la-chapter-view-content h2 { font-size: 18px; margin-bottom: 12px; }
.la-chapter-view-content h3 { font-size: 16px; margin-bottom: 8px; }
.la-chapter-view-content p { margin-bottom: 12px; }
.la-chapter-view-content pre { margin: 12px 0; }

.la-history-item {
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.15s;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-primary);
}
.la-history-item:hover {
    background: var(--bg-hover);
}
.la-history-item.active {
    background: var(--bg-active);
    font-weight: 600;
}
.la-history-item-text {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.la-history-item-delete {
    font-size: 14px;
    opacity: 0;
    cursor: pointer;
    color: var(--text-tertiary);
    transition: opacity 0.15s, color 0.15s;
    padding: 2px 6px;
    flex-shrink: 0;
}
.la-history-item:hover .la-history-item-delete {
    opacity: 1;
}
.la-history-item-delete:hover {
    color: #ef4444;
}

.la-chapter-count-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
}

.la-chapter-count-input {
    width: 80px;
    padding: 8px 12px;
    border: none;
    box-shadow: var(--ring-subtle);
    border-radius: var(--radius-md);
    font-size: var(--font-size);
    text-align: center;
    background: var(--bg-input);
    color: var(--text-primary);
}

.la-chapter-count-input:focus {
    outline: none;
    box-shadow: 0 0 0 2px rgba(124,77,255,.25);
}

.la-chapter-count-hint {
    font-size: 12px;
    color: var(--text-tertiary);
}

/* Model toggle in Phase 1 */
.la-model-row {
    display: flex;
    gap: 16px;
    margin: 8px 0 4px 0;
}

.la-model-option {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: none;
    box-shadow: var(--ring-subtle);
    border-radius: var(--radius-pill);
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    transition: background 0.2s, box-shadow 0.2s, color 0.2s;
    background: var(--bg-input);
}

.la-model-option:has(input:checked) {
    box-shadow: 0 0 0 1px var(--accent);
    color: var(--accent);
    font-weight: 600;
    background: rgba(124,77,255,.06);
}

.la-model-option:hover {
    box-shadow: 0 0 0 1px var(--accent);
}

.la-model-option input[type="radio"] {
    accent-color: var(--accent);
}

/* Shared buttons */
.la-primary-btn, .la-secondary-btn, .la-warning-btn {
    padding: 10px 24px;
    border-radius: var(--radius-lg);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, opacity 0.2s, transform 0.2s;
    border: none;
}

.la-primary-btn {
    background: var(--accent);
    color: var(--text-user-bubble);
    box-shadow: 0 2px 8px rgba(124,77,255,0.2);
}

.la-primary-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.la-primary-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.la-secondary-btn {
    background: var(--bg-hover);
    color: var(--text-secondary);
    border: none;
    box-shadow: var(--ring-subtle);
}

.la-secondary-btn:hover {
    background: var(--border-light);
    color: var(--text-primary);
}

.la-warning-btn {
    background: var(--btn-warning);
    color: #fff;
}

.la-warning-btn:hover {
    background: var(--btn-warning-hover);
}

/* Progress bars */
.la-outline-progress, .la-gen-progress {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.la-progress-bar {
    flex: 1;
    height: 8px;
    background: var(--border-lighter);
    border-radius: 999px;
    overflow: hidden;
}

.la-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), #B388FF);
    border-radius: 999px;
    transition: width 0.3s;
    width: 0%;
}

.la-progress-text {
    font-size: 12px;
    color: var(--text-tertiary);
    white-space: nowrap;
}

/* Phase 2: Outlines */
.la-outline-header, .la-generation-header {
    margin-bottom: 20px;
}

.la-outline-header h3, .la-generation-header h3 {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.la-outline-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin: 20px 0;
}

.la-outline-item {
    background: var(--bg-bubble-assistant);
    border-radius: var(--radius-md);
    padding: 16px;
    box-shadow: var(--shadow-elevated);
}

.la-outline-item-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.la-outline-item-abstract {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.la-outline-chapter-num {
    user-select: none;
}
.la-outline-editable {
    display: inline;
    outline: none;
    border-radius: 3px;
    padding: 1px 4px;
    margin: -1px -4px;
    transition: background 0.15s;
}
.la-outline-editable:hover {
    background: var(--bg-hover);
}
.la-outline-editable:focus {
    background: var(--bg-input);
    box-shadow: 0 0 0 2px var(--accent-glow);
    border-radius: 4px;
}

.la-outline-item-actions {
    display: flex;
    gap: 8px;
    margin-top: 12px;
}

.la-outline-item-actions button {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    cursor: pointer;
    border: none;
    box-shadow: var(--ring-subtle);
    background: var(--bg-input);
    color: var(--text-secondary);
    transition: background 0.2s, box-shadow 0.2s, color 0.2s;
}

.la-outline-item-actions button:hover {
    background: var(--bg-hover);
    box-shadow: 0 0 0 1px var(--accent);
    color: var(--accent);
}

.la-outline-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-top: 24px;
    flex-wrap: wrap;
}

/* Phase 3: Completed chapters (viewable during generation) */
.la-gen-completed {
    margin-bottom: 20px;
}

.la-completed-chapter {
    background: var(--bg-bubble-assistant);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 12px;
    box-shadow: var(--shadow-elevated);
}

.la-completed-chapter h4 {
    font-size: 15px;
    font-weight: 600;
    color: #34c759;
    margin: 0 0 8px 0;
}

.la-completed-chapter-body {
    font-size: var(--font-size);
    line-height: 1.8;
    color: var(--text-primary);
    max-height: 300px;
    overflow-y: auto;
}

/* Phase 3: Streaming */
.la-gen-current-chapter {
    margin: 20px 0;
}

.la-chapter-stream-bubble {
    background: var(--bg-bubble-assistant);
    border-radius: var(--radius-lg);
    padding: 20px;
    min-height: 200px;
    box-shadow: var(--shadow-card);
    font-size: var(--font-size);
    line-height: 1.8;
    color: var(--text-primary);
}

.la-chapter-stream-content {
    min-height: 20px;
}

.la-gen-actions {
    display: flex;
    justify-content: center;
    margin-top: 16px;
}

/* Phase 4: Complete article */
.la-complete-header {
    text-align: center;
    margin-bottom: 20px;
}

.la-complete-header h3 {
    font-size: 20px;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.la-complete-header p {
    font-size: 13px;
    color: var(--text-tertiary);
}

.la-complete-article {
    background: var(--bg-bubble-assistant);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin: 20px 0;
    box-shadow: var(--shadow-card);
    font-size: var(--font-size);
    line-height: 1.8;
    color: var(--text-primary);
    max-height: 55vh;
    overflow-y: auto;
}

.la-complete-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

/* Sidebar interaction: suppress desktop push when modal open */
body.la-modal-open #mainWrapper.sidebar-open {
    margin-left: 0 !important;
}

/* ===== 长篇文章写作 - 移动端适配 ===== */
@media (max-width: 600px) {
    .la-chapter-nav {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        z-index: 1020;
        width: 75vw;
        height: 100vh;
        height: 100dvh;
        transform: translateX(-100%);
        transition: transform 0.25s cubic-bezier(.22,1,.36,1);
        box-shadow: var(--shadow-elevated);
    }

    .la-chapter-nav.mobile-open {
        transform: translateX(0);
    }

    /* Chapter nav backdrop */
    .la-chapter-nav-backdrop {
        display: none;
        position: fixed;
        inset: 0;
        z-index: 1019;
        background: rgba(0,0,0,.35);
    }

    .la-chapter-nav-backdrop.show {
        display: block;
    }

    .la-main {
        padding: 16px;
    }

    .la-welcome {
        margin: 32px auto;
    }

    .la-welcome h2 {
        font-size: 20px;
    }

    .la-input-section {
        margin: 20px auto;
    }

    .la-outline-item {
        padding: 12px;
    }

    .la-outline-item-title {
        font-size: 14px;
    }

    .la-chapter-stream-bubble {
        padding: 12px;
        min-height: 120px;
    }

    .la-complete-article {
        padding: 12px;
        max-height: 45vh;
    }

    .la-title {
        font-size: 14px;
    }

    .la-header {
        padding: 8px 12px;
    }

    .la-primary-btn, .la-secondary-btn, .la-warning-btn {
        padding: 8px 16px;
        font-size: 13px;
    }

    .la-outline-actions {
        flex-direction: column;
        align-items: center;
    }

    /* 移动端：规则面板改为底部弹出 sheet */
    .rules-panel {
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
        max-width: 100%;
        max-height: 55vh;
        border-radius: 20px 20px 0 0;
        animation: sheetSlideUp 0.3s cubic-bezier(.22,1,.36,1);
    }
    .rules-panel-overlay {
        background: rgba(0,0,0,0.35);
    }
}