:root{--bg:#ffffff;--sidebar:#f7f7f8;--surface:#ffffff;--surface-soft:#f1f2f4;--surface-hover:#e8e9ec;--border:#e5e7eb;--border-soft:#eeeeef;--text:#111111;--muted:#737373;--faint:#a3a3a3;--brand:#4f7dff;--brand-soft:#e7eafe;--brand-border:#c7d2fe;--danger:#dc2626;--shadow-sm:0 2px 10px rgba(22,27,34,0.04);--radius-row:8px;--radius-button:12px;--radius-composer:22px;color-scheme:light}*{box-sizing:border-box}body,html{height:100%;margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;letter-spacing:0}button,input,textarea{font:inherit}button{border:0;cursor:pointer}button:disabled{cursor:not-allowed;opacity:.48}input,textarea{width:100%;border:1px solid var(--border);border-radius:12px;color:var(--text);background:#fff;outline:none}input:focus,textarea:focus{border-color:var(--brand-border);box-shadow:0 0 0 3px rgba(79,125,255,.12)}.app-shell{display:grid;grid-template-columns:261px 1fr;height:100dvh;overflow:hidden;background:var(--bg)}.sidebar{display:flex;flex-direction:column;min-height:0;border-right:0;background:var(--sidebar);padding:6px 12px 10px}.sidebar-header{justify-content:space-between;height:48px;padding:0 4px;color:var(--muted)}.brand,.sidebar-header{display:flex;align-items:center}.brand{gap:8px;color:var(--brand)}.brand img{width:30px;height:30px;border-radius:9px}.brand strong{font-size:17px;font-weight:700}.sidebar-icons{gap:6px}.bare-icon,.sidebar-icons{display:inline-flex;align-items:center}.bare-icon{justify-content:center;width:34px;height:34px;border-radius:10px;background:transparent;color:#5f6368;transition:background-color .12s ease,color .12s ease,transform .12s ease}.bare-icon:hover{background:#eceef2;color:var(--text);transform:translateY(-1px)}.new-chat{display:flex;align-items:center;gap:8px;width:100%;min-height:40px;border-radius:10px;background:#eef0f4;padding:0 11px;color:var(--text);font-size:14px;font-weight:600;transition:background-color .12s ease,box-shadow .12s ease}.sidebar-header+.new-chat{margin-top:16px}.new-chat:hover{background:var(--surface-hover)}.new-chat kbd{margin-left:auto;color:#b5b5b8;font-family:inherit;font-size:12px;font-weight:600}.new-chat.secondary{min-height:36px;margin-top:0;justify-content:center;background:transparent;color:var(--muted);padding:0 9px;font-size:13px;font-weight:600}.new-chat.secondary:hover{background:#f5f5f5;color:var(--text)}.sidebar-tools{display:grid;grid-template-columns:1fr 1fr;grid-gap:8px;gap:8px;margin-top:8px}.history{flex:1 1;min-height:0;overflow-y:auto;padding:12px 0;-webkit-overflow-scrolling:touch}.section-label{display:block;margin:16px 2px 2px;color:#9ca3af;font-size:13px;font-weight:600}.chat-row{display:block;width:100%;min-height:40px;overflow:hidden;border-radius:8px;background:transparent;padding:11px 10px;color:#111;font-size:14px;font-weight:500;text-align:left;text-overflow:ellipsis;white-space:nowrap;transition:background-color .12s ease}.chat-row:hover{background:#f5f5f5}.chat-row.active{background:#eceef2}.sidebar-footer{display:grid;grid-gap:5px;gap:5px;padding-top:8px}.footer-action{display:flex;align-items:center;gap:8px;min-height:32px;border-radius:10px;background:transparent;padding:0 8px;color:var(--muted);text-align:left}.footer-action:hover{background:var(--surface-soft);color:var(--text)}.profile-row{display:flex;align-items:center;gap:8px;min-height:44px;border-radius:10px;padding:0 6px;color:var(--text)}.profile-row .avatar{display:grid;width:32px;height:32px;place-items:center;border-radius:999px;background:#2f3137;color:#fff;font-size:13px;font-weight:700}.profile-row span,.sidebar-footer span{overflow:hidden;color:#6b7280;font-size:13px;text-overflow:ellipsis;white-space:nowrap}.main{display:flex;min-width:0;min-height:0;flex-direction:column;background:var(--bg)}.topbar{display:grid;grid-template-columns:44px 1fr auto;align-items:center;min-height:54px;padding:0 20px}.chat-title{display:flex;align-items:center;justify-content:center;gap:8px;min-width:0;color:var(--text)}.chat-title strong{overflow:hidden;font-size:15px;font-weight:700;text-overflow:ellipsis;white-space:nowrap}.main.is-empty .chat-title{visibility:hidden}.top-actions{display:flex;align-items:center;gap:6px}.icon-button{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:999px;background:transparent;color:var(--muted);transition:background-color .12s ease,color .12s ease}.icon-button:hover{background:var(--surface-soft);color:var(--text)}.icon-button.danger:hover{background:#fee2e2;color:var(--danger)}.mobile-only{visibility:hidden}.message-stream{display:flex;flex:1 1;min-height:0;flex-direction:column;gap:18px;overflow-y:auto;padding:24px max(34px,calc((100vw - 1030px) / 2)) 18px;-webkit-overflow-scrolling:touch}.empty-state{display:grid;place-items:center;align-content:center;min-height:100%;grid-gap:20px;gap:20px;color:var(--text);text-align:center;transform:translateY(-46px)}.empty-state h1{margin:0;font-size:30px;font-weight:800;line-height:1.08;text-wrap:balance}.mode-control{background:var(--surface-soft);padding:2px;box-shadow:inset 0 0 0 1px rgba(15,23,42,.03)}.mode-control,.mode-control button{display:inline-flex;border-radius:999px}.mode-control button{align-items:center;justify-content:center;gap:6px;min-width:145px;min-height:34px;background:transparent;padding:0 16px;color:var(--muted);font-size:13px;font-weight:700}.mode-control button.active{border:0;background:#fff;color:var(--text);box-shadow:0 1px 4px rgba(15,23,42,.07)}.message{max-width:774px;width:-moz-fit-content;width:fit-content;min-width:min(420px,100%);border-radius:16px;padding:14px 16px;-webkit-user-select:text;-moz-user-select:text;user-select:text}.message.user{align-self:flex-end;background:#f0f1f4}.message.assistant{align-self:flex-start;background:#fff}.message-meta{display:flex;align-items:center;gap:8px;margin-bottom:8px;color:var(--faint);font-size:12px;font-weight:600}.reasoning{margin:2px 0 12px;border-left:3px solid #d1d5db;padding-left:12px;color:#8a8a8a}.reasoning span{display:block;margin-bottom:4px;font-size:12px;font-weight:700}.reasoning p{margin:0;font-size:14px;line-height:1.58}.message-content{font-size:15px;line-height:1.66}.message-content>:first-child,.reasoning>:first-child:not(span){margin-top:0}.message-content>:last-child,.reasoning>:last-child{margin-bottom:0}.message-content p,.reasoning p{margin:0 0 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button:hover{background:var(--surface-soft);color:var(--text)}.notice,.typing{display:inline-flex;align-items:center;gap:8px;align-self:center;border-radius:999px;background:var(--surface-soft);padding:8px 12px;color:var(--muted);font-size:13px}.notice{margin:0 auto 8px;max-width:min(880px,calc(100% - 32px));border:1px solid var(--border);background:#fff;color:var(--text)}.composer{width:min(774px,calc(100% - 64px));margin:0 auto max(24px,env(safe-area-inset-bottom));border:1px solid #e5e5e5;border-radius:var(--radius-composer);background:#fff;padding:0;box-shadow:0 10px 26px rgba(15,23,42,.04)}.composer textarea{min-height:60px;max-height:240px;resize:none;border:0;border-radius:22px 22px 12px 12px;padding:18px 24px 8px;box-shadow:none;font-size:15px;line-height:1.45}.composer textarea:focus{box-shadow:none}.composer-tools{display:flex;align-items:center;justify-content:space-between;min-height:58px;gap:12px;margin-top:0;padding:0 12px 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solid var(--border);background:#fff;box-shadow:-16px 0 50px rgba(0,0,0,.08)}.drawer-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;border-bottom:1px solid var(--border-soft);padding:22px}.drawer-head h2,.modal h2{margin:0 0 6px;font-size:20px}.drawer-head p,.modal p{margin:0;color:var(--muted);font-size:14px;line-height:1.45}.rag-upload{display:grid;grid-gap:12px;gap:12px;padding:18px 22px;border-bottom:1px solid var(--border-soft)}.scope-switch{display:grid;grid-template-columns:1fr 1fr;border-radius:999px;background:var(--surface-soft);padding:4px}.scope-switch button{min-height:34px;border-radius:999px;background:transparent;color:var(--muted);font-size:12px;font-weight:700}.scope-switch button.active{background:#fff;color:var(--text);box-shadow:var(--shadow-sm)}.file-drop{display:grid;place-items:center;grid-gap:8px;gap:8px;min-height:118px;border:1px dashed 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12px}.modal-backdrop{position:fixed;inset:0;z-index:40;display:grid;place-items:center;background:rgba(17,24,39,.24);padding:20px}.auth-card,.modal{position:relative;display:grid;width:min(420px,100%);grid-gap:14px;gap:14px;border:1px solid var(--border);border-radius:20px;background:#fff;padding:24px;box-shadow:0 20px 60px rgba(0,0,0,.14)}.close{position:absolute;top:12px;right:12px}.modal label{display:grid;grid-gap:6px;gap:6px;color:var(--muted);font-size:13px;font-weight:700}.auth-card input,.modal input{min-height:42px;padding:0 12px}.edit-modal textarea{min-height:180px;resize:vertical;padding:12px}.auth-screen{display:grid;min-height:100dvh;place-items:center;background:linear-gradient(180deg,#ffffff,#f8fafc);padding:20px}.auth-card{text-align:left}.auth-card h1{margin:0;font-size:24px}.auth-card p{margin:0;color:var(--muted);line-height:1.45}.ghost-button{background:var(--surface-soft)!important;color:var(--text)!important}.reset-box{display:grid;grid-gap:10px;gap:10px}.form-error{color:var(--danger);font-size:13px}.qr{width:180px;height:180px;justify-self:center;border-radius:14px}.secret-code{overflow-wrap:anywhere;border-radius:10px;background:var(--surface-soft);padding:10px;color:var(--muted)}.spin{animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}@media (max-width:820px){.app-shell{grid-template-columns:1fr}.sidebar{position:fixed;inset:0 auto 0 0;z-index:50;width:min(261px,86vw);transform:translateX(-100%);box-shadow:18px 0 40px rgba(0,0,0,.12);transition:transform .18s ease}.sidebar.open{transform:translateX(0)}.mobile-only{visibility:visible}.topbar{grid-template-columns:44px 1fr auto;min-height:60px;padding:0 10px}.chat-title{justify-content:flex-start}.chat-title strong{max-width:178px;font-size:16px}.message-stream{padding:24px 14px 16px}.message{min-width:0;width:auto;max-width:96%}.composer{width:min(324px,calc(100% - 24px));border-radius:22px;margin-bottom:max(16px,env(safe-area-inset-bottom))}.composer textarea{min-height:42px;padding:14px 22px 4px}.composer-tools{align-items:flex-end;min-height:58px;padding:0 12px 12px}.pill-group{flex-wrap:nowrap;gap:6px;min-width:0}.pill-group button{min-height:32px;max-width:144px;overflow:hidden;padding:0 8px;font-size:11px;text-overflow:ellipsis;white-space:nowrap}.empty-state{transform:translateY(-78px)}.empty-state h1{font-size:28px}}