:root{color-scheme:light;--canvas: #fafafa;--canvas-deep: #f3f3f3;--surface: #ffffff;--surface-raised: #ffffff;--surface-subtle: #f5f5f5;--surface-hover: #efefef;--surface-strong: #e9e9e9;--ink: #2f2e2b;--ink-strong: #1f1e1b;--muted: #73716b;--faint: #a09d94;--border: #dedede;--border-soft: #e9e9e9;--brand: #2f626b;--brand-hover: #264f57;--brand-soft: #e1ebeb;--brand-signal: #b9d66d;--focus-ring: #4f7e85;--activity: #3e7077;--activity-soft: #eaf0ef;--voice-active: #146eb4;--voice-active-soft: #dcecff;--success: #39765a;--danger: #a8473a;--warning: #9a6a32;--file-pdf: #b8554d;--file-word: #5273a8;--file-sheet: #4c7f62;--file-presentation: #b96f45;--file-markdown: #746793;--file-text: #77736b;--shadow-soft: 0 1px 2px rgba(44, 40, 32, .04), 0 12px 34px rgba(44, 40, 32, .07);--shadow-overlay: 0 24px 70px rgba(44, 40, 32, .18);--radius-sm: 9px;--radius: 14px;--radius-lg: 20px;--radius-xl: 26px;--sidebar-width: 280px;--sidebar-rail-width: 46px;--content-width: 760px;--composer-height: 150px;--ease-out: cubic-bezier(.23, 1, .32, 1);--transition: .15s var(--ease-out);--font-chat: ui-serif, Georgia, "Songti SC", STSong, serif;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;color:var(--ink);background:var(--canvas);font-synthesis:none;text-rendering:optimizeLegibility}@media(prefers-color-scheme:dark){:root{color-scheme:dark;--canvas: #262624;--canvas-deep: #222220;--surface: #353533;--surface-raised: #3d3d3b;--surface-subtle: #30302e;--surface-hover: #484844;--surface-strong: #454541;--ink: #d4d2ca;--ink-strong: #f0eee7;--muted: #b0aea6;--faint: #85837d;--border: #57554f;--border-soft: #474641;--brand: #83b5bb;--brand-hover: #9bc5ca;--brand-soft: #2c4549;--brand-signal: #c7dc78;--focus-ring: #86b7bd;--activity: #83b5bb;--activity-soft: #303f40;--voice-active: #82b9e9;--voice-active-soft: #263d52;--success: #78aa8a;--danger: #db8172;--warning: #d4a56d;--file-pdf: #e08a7e;--file-word: #8eb0df;--file-sheet: #80b996;--file-presentation: #e0a075;--file-markdown: #aca0d0;--file-text: #aaa79e;--shadow-soft: 0 1px 2px rgba(0, 0, 0, .22), 0 12px 34px rgba(0, 0, 0, .24);--shadow-overlay: 0 24px 70px rgba(0, 0, 0, .48)}}*{box-sizing:border-box}html,body,#app,.app-view{width:100%;height:100%}html{background:var(--canvas)}body{margin:0;min-width:320px;overflow:hidden;background:var(--canvas);color:var(--ink);-webkit-font-smoothing:antialiased}html.login-route,html.login-route body{background:#0f110e}button,input,textarea,select{font:inherit;color:inherit}button,a{-webkit-tap-highlight-color:transparent}button{border:0}a{color:inherit;text-decoration:none}::selection{background:var(--brand-soft);color:var(--ink-strong)}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,summary:focus-visible{outline:2px solid color-mix(in srgb,var(--focus-ring) 82%,white);outline-offset:2px}.sr-only,.sr-only[type=file]{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.mobile-only{display:none!important}.eyebrow{margin:0;color:var(--brand);font-size:11px;font-weight:700;letter-spacing:.14em}.spin{animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.button{min-height:39px;padding:9px 16px;border-radius:11px;display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--border);background:var(--surface);color:var(--ink);font-size:13px;font-weight:650;cursor:pointer;transition:background-color var(--transition),border-color var(--transition),color var(--transition),opacity var(--transition),transform .16s var(--ease-out)}.button:hover:not(:disabled){background:var(--surface-hover)}.button:disabled{opacity:.48;cursor:default}.button.primary{background:var(--ink-strong);border-color:var(--ink-strong);color:#fff}.button.primary:hover:not(:disabled){background:#393732}.button.brand{background:var(--brand);border-color:var(--brand);color:#fff}.button.brand:hover:not(:disabled){background:var(--brand-hover);border-color:var(--brand-hover)}.button.ghost{background:transparent}.button.danger{background:var(--danger);border-color:var(--danger);color:#fff}.button.danger:hover:not(:disabled){background:color-mix(in srgb,var(--danger) 88%,var(--ink-strong));border-color:color-mix(in srgb,var(--danger) 88%,var(--ink-strong))}.button.wide{width:100%}.icon-button{width:36px;height:36px;border-radius:10px;display:inline-grid;place-items:center;flex:none;background:transparent;color:var(--muted);cursor:pointer;transition:background-color var(--transition),color var(--transition),opacity var(--transition),transform .16s var(--ease-out)}.icon-button:hover{color:var(--ink-strong);background:var(--surface-hover)}.chat-app{height:100dvh;display:grid;grid-template-columns:var(--sidebar-width) minmax(0,1fr);grid-template-rows:minmax(0,1fr);overflow:hidden;background:var(--canvas);transition:grid-template-columns .24s cubic-bezier(.32,.72,0,1)}.chat-app.sidebar-collapsed{grid-template-columns:var(--sidebar-rail-width) minmax(0,1fr)}.conversation-navigation{display:contents}@media(min-width:1180px){.chat-app.orders-visible{grid-template-columns:var(--sidebar-width) minmax(0,1fr) 320px}.chat-app.sidebar-collapsed.orders-visible{grid-template-columns:var(--sidebar-rail-width) minmax(0,1fr) 320px}}.chat-app.sidebar-motion-disabled,.chat-app.sidebar-motion-disabled .chat-sidebar,.chat-app.sidebar-motion-disabled .sidebar-rail{transition:none!important}.chat-main{min-width:0;min-height:0;height:100%;grid-column:2;grid-row:1;display:flex;flex-direction:column;position:relative}.chat-header{min-height:calc(58px + env(safe-area-inset-top));padding:calc(8px + env(safe-area-inset-top)) calc(18px + env(safe-area-inset-right)) 8px calc(18px + env(safe-area-inset-left));display:flex;align-items:center;gap:10px;position:relative;z-index:12;background:color-mix(in srgb,var(--canvas) 88%,transparent);border-bottom:1px solid transparent;-webkit-backdrop-filter:blur(14px) saturate(140%);backdrop-filter:blur(14px) saturate(140%)}.menu-button{display:none}.chat-title{min-width:0;max-width:min(460px,calc(100% - 46px));flex:0 1 auto;display:flex;flex-direction:column;gap:2px}.chat-title-primary{min-width:0;width:100%;display:flex;align-items:center}.chat-title 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var(--canvas-deep));width:100%;min-width:0;height:100%;padding:calc(12px + env(safe-area-inset-top)) calc(10px + env(safe-area-inset-right)) calc(12px + env(safe-area-inset-bottom)) calc(10px + env(safe-area-inset-left));grid-column:1;grid-row:1;display:flex;flex-direction:column;overflow:clip;background:var(--sidebar-surface);border-right:1px solid var(--border-soft);z-index:30;opacity:1;visibility:visible;transform:translate(0);transition:opacity .16s var(--ease-out),transform .24s cubic-bezier(.32,.72,0,1),visibility 0s linear 0s}.chat-app.sidebar-collapsed .chat-sidebar{opacity:0;visibility:hidden;pointer-events:none;transform:translate(-10px);transition:opacity .14s var(--ease-out),transform .22s cubic-bezier(.32,.72,0,1),visibility 0s linear .22s}.sidebar-brand{height:42px;padding:0 7px 0 9px;display:grid;grid-template-columns:minmax(0,1fr) 36px;align-items:center}.sidebar-brand .brand-lockup{grid-column:1;justify-self:center;gap:8px;font-size:21px;font-weight:500}.sidebar-collapse-button,.sidebar-brand>.mobile-only{grid-column:2;grid-row:1;justify-self:end}.sidebar-collapse-button{opacity:.72}.sidebar-brand:hover .sidebar-collapse-button,.sidebar-collapse-button:hover,.sidebar-collapse-button:focus-visible{opacity:1}.sidebar-rail{width:var(--sidebar-rail-width);height:100%;padding:calc(8px + env(safe-area-inset-top)) 6px calc(12px + env(safe-area-inset-bottom));grid-column:1;grid-row:1;display:flex;flex-direction:column;align-items:center;gap:0;background:var(--canvas);border-right:1px solid var(--border-soft);z-index:31;opacity:1;transform:translate(0)}.sidebar-rail-enter-active,.sidebar-rail-leave-active{transition:opacity .16s var(--ease-out),transform .22s cubic-bezier(.32,.72,0,1)}.sidebar-rail-leave-active{pointer-events:none}.sidebar-rail-enter-from,.sidebar-rail-leave-to{opacity:0;transform:translate(-7px)}.sidebar-rail-button{width:34px;height:34px;position:relative;border-radius:9px;color:var(--ink)}.sidebar-rail>.sidebar-rail-button:first-child{background:var(--surface-strong)}.sidebar-rail-button:after{content:attr(data-tooltip);padding:7px 9px;position:absolute;left:calc(100% + 3px);top:50%;z-index:45;border-radius:7px;background:#292824;color:#fff;box-shadow:0 6px 18px #1f1e1b38;font-size:11px;font-weight:500;line-height:1.2;white-space:nowrap;opacity:0;visibility:hidden;pointer-events:none;transform:translate(3px,-50%);transition:opacity .12s ease,transform .12s ease,visibility .12s ease}.sidebar-rail-button:focus-visible:after{opacity:1;visibility:visible;transform:translateY(-50%)}.sidebar-rail-new-chat{margin-top:14px;border-radius:99px;color:#fff}.sidebar-rail-new-chat svg{width:22px;height:22px;padding:4px;border-radius:99px;background:var(--brand)}.sidebar-rail-new-chat:hover{background:transparent;color:#fff}.sidebar-rail-new-chat:hover svg{background:var(--brand-hover)}.brand-lockup{display:inline-flex;align-items:center;gap:9px;color:var(--ink-strong);font-family:ui-serif,Georgia,Songti SC,serif;font-size:18px;font-weight:650}.brand-lockup.large{font-size:21px}.brand-symbol{width:25px;height:28px;display:inline-grid;place-items:center;flex:none}.sidebar-brand .brand-symbol{-webkit-user-select:none;user-select:none;touch-action:manipulation}.brand-symbol picture,.brand-symbol img{width:100%;height:100%;display:block}.brand-symbol img{object-fit:contain}.new-chat-button{width:100%;height:44px;margin:7px 0 18px;padding:0 7px;display:flex;align-items:center;justify-content:flex-start;gap:10px;border-radius:10px;background:transparent;color:var(--ink);font-size:13px;font-weight:590;cursor:pointer;transition:background-color var(--transition),color var(--transition),transform .16s var(--ease-out)}.new-chat-button:hover{background:var(--surface-hover)}.new-chat-icon{width:28px;height:28px;border-radius:99px;display:grid;place-items:center;flex:none;background:var(--surface-strong);color:var(--ink);transition:background-color var(--transition),color var(--transition)}.new-chat-button:hover .new-chat-icon{background:color-mix(in srgb,var(--surface-strong) 86%,var(--ink))}.thread-list{min-height:0;flex:1;overflow:auto;padding:0 2px 12px;scrollbar-width:thin;scrollbar-color:var(--border) transparent}.sidebar-section-label{margin:0 10px 9px;color:var(--faint);font-size:12px;font-weight:500;letter-spacing:0}.thread-row{width:100%;min-height:58px;margin:2px 0;padding:9px 10px;display:flex;align-items:flex-start;gap:9px;border-radius:11px;background:transparent;color:var(--muted);text-align:left;cursor:pointer;position:relative;transition:transform .16s var(--ease-out)}.thread-row:hover{background:color-mix(in srgb,var(--surface-hover) 75%,transparent)}.thread-row.active{background:var(--surface-hover);color:var(--ink)}.thread-row.active:before{content:"";position:absolute;left:2px;top:16px;width:2px;height:25px;border-radius:99px;background:var(--brand)}.thread-row>svg{margin-top:2px;flex:none}.thread-content{min-width:0;flex:1;display:flex;flex-direction:column;gap:5px}.thread-title{overflow:hidden;white-space:nowrap;text-overflow:ellipsis;color:var(--ink);font-size:12.5px;font-weight:560}.thread-meta{display:flex;justify-content:space-between;gap:8px;color:var(--faint);font-size:10px}.thread-meta .draft{color:var(--warning)}.sidebar-footer{min-height:57px;padding:10px 9px 3px;border-top:1px solid var(--border-soft);display:flex;align-items:center;gap:10px}.environment-avatar{width:30px;height:30px;border-radius:99px;display:grid;place-items:center;flex:none;background:var(--ink-strong);color:var(--canvas);font-size:12px;font-weight:700}.environment-copy{min-width:0;display:flex;flex-direction:column;gap:2px}.environment-copy strong{color:var(--ink);font-size:12.5px;font-weight:560}.environment-copy small{color:var(--faint);font-size:10px}.sidebar-backdrop{display:none}.conversation-surface{min-height:0;flex:1;position:relative;display:flex;flex-direction:column}.message-stage{min-height:0;flex:1;position:relative}.message-scroller{width:100%;height:100%;overflow-y:auto;overscroll-behavior:contain;scroll-padding-block:12px calc(var(--composer-height) + 12px);scrollbar-width:thin;scrollbar-color:var(--border) transparent}.message-column{--message-gap: 29px;width:min(calc(100% - 36px),var(--content-width));min-height:100%;margin:0 auto;padding:34px 0 calc(var(--composer-height) + 20px);display:flex;flex-direction:column;gap:var(--message-gap)}.message-history,.response-stage{width:100%;min-width:0;display:flex;flex-direction:column;gap:var(--message-gap)}.message-loading{padding-top:22vh;display:flex;align-items:center;justify-content:center;gap:8px;color:var(--muted);font-size:12px;text-align:center}.message-load-error{min-height:100%;padding:8vh 20px calc(var(--composer-height) + 70px);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}.message-load-error>span{width:38px;height:38px;margin-bottom:14px;border-radius:12px;display:grid;place-items:center;background:#fff0ea;color:var(--danger)}.message-load-error strong{color:var(--ink-strong);font-size:15px}.message-load-error p{max-width:420px;margin:8px 0 15px;color:var(--muted);font-size:12px;line-height:1.6;overflow-wrap:anywhere}.message-load-error .button{min-height:36px;padding:7px 13px;font-size:12px}.jump-to-latest{width:34px;height:34px;position:absolute;left:50%;bottom:calc(var(--composer-height) + 2px);z-index:8;border:1px solid var(--border);border-radius:99px;display:grid;place-items:center;background:var(--surface-raised);color:var(--muted);box-shadow:var(--shadow-soft);cursor:pointer;transform:translate(-50%);transition:background-color var(--transition),border-color var(--transition),color var(--transition),transform .16s var(--ease-out)}.jump-to-latest:hover{color:var(--ink)}.jump-to-interrupt{width:auto;max-width:calc(100% - 32px);height:36px;padding:0 12px;border-radius:8px;display:flex;gap:6px;align-items:center;color:var(--brand);font-size:13px;font-weight:600;white-space:nowrap}.welcome-state{min-height:100%;padding:9vh 20px calc(var(--composer-height) + 70px);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}.welcome-heading{display:flex;align-items:center;justify-content:center;gap:17px}.welcome-mascot{--xiaofeng-mascot-size: 76px;height:auto;display:block;flex:none;filter:drop-shadow(0 12px 18px rgba(31,30,27,.16))}.welcome-copy{min-width:0;display:flex;flex-direction:column;align-items:flex-start;text-align:left}.welcome-state h1{margin:0;color:#3a3935;font-family:ui-serif,Georgia,Songti SC,serif;font-size:clamp(30px,3vw,40px);font-weight:450;line-height:1.15;letter-spacing:-.025em}.conversation-surface.conversation-empty{padding:24px 0 calc(24px + 6vh);display:grid;grid-auto-rows:max-content;align-content:safe center;gap:28px;overflow-y:auto}.conversation-empty .message-stage{min-height:0;flex:none}.conversation-empty .message-scroller{height:auto;overflow:visible}.conversation-empty .welcome-state{min-height:0;padding:0 20px}.conversation-empty .composer-zone{--composer-frame-width: 680px;width:100%;min-width:0;position:static;padding-bottom:0;background:transparent}.user-turn{max-width:78%;margin-left:auto;display:flex;flex-direction:column;align-items:flex-end;gap:7px;position:relative}.user-turn:focus,.assistant-turn:focus{outline:none}.user-bubble{padding:11px 15px;border-radius:17px;background:var(--surface-strong);color:var(--ink-strong);font-size:14.5px;line-height:1.55;overflow-wrap:anywhere}.user-copy{position:absolute;right:-31px;bottom:4px;opacity:0}.user-turn:hover .user-copy{opacity:1}.sent-files{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:6px}.sent-file{width:min(292px,72vw);min-height:62px;padding:9px 10px;border:1px solid var(--border);border-radius:13px;display:inline-flex;align-items:center;gap:9px;background:var(--surface);color:var(--muted);text-align:left;cursor:pointer;transition:background-color var(--transition),border-color var(--transition),color var(--transition),opacity var(--transition),transform .16s var(--ease-out)}.sent-file:hover:not(:disabled){border-color:color-mix(in srgb,var(--file-color) 38%,var(--border));background:var(--surface-raised);box-shadow:var(--shadow-soft)}.sent-file:disabled{cursor:wait;opacity:.72}.file-format-badge{width:42px;height:42px;border-radius:10px;display:grid;place-items:center;flex:none;background:color-mix(in srgb,var(--file-color) 13%,white);color:var(--file-color);font-size:9px;font-weight:800;letter-spacing:-.01em}.file-identity{min-width:0;flex:1;display:flex;align-items:center;gap:9px}.file-identity-content{min-width:0;flex:1;display:flex;flex-direction:column;gap:4px}.file-identity-content strong{overflow:hidden;color:var(--ink-strong);font-size:12px;font-weight:650;text-overflow:ellipsis;white-space:nowrap}.file-identity-content small{overflow:hidden;color:var(--faint);font-size:9.5px;text-overflow:ellipsis;white-space:nowrap}.file-download-icon{flex:none;color:var(--muted);transition:color var(--transition)}.sent-file:hover:not(:disabled) .file-download-icon,.sent-file:focus-visible .file-download-icon{color:var(--file-color)}.file-kind-pdf{--file-color: var(--file-pdf)}.file-kind-word{--file-color: var(--file-word)}.file-kind-spreadsheet,.file-kind-csv{--file-color: var(--file-sheet)}.file-kind-presentation{--file-color: var(--file-presentation)}.file-kind-markdown{--file-color: var(--file-markdown)}.file-kind-text,.file-kind-unknown{--file-color: var(--file-text)}.spin{animation:file-spin .8s linear infinite}@keyframes file-spin{to{transform:rotate(360deg)}}.sent-images{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:7px}.sent-image-preview{padding:0;border:1px solid var(--border-soft);border-radius:14px;display:block;overflow:hidden;background:var(--surface);cursor:zoom-in}.sent-image-preview img{max-width:280px;max-height:260px;display:block;object-fit:cover}.voice-message{min-width:150px;padding:9px 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