:root{--background:#ffffff;--sidebar:#f9f9f9;--sidebar-hover:#ececec;--sidebar-active:#e9e9e9;--border:#e5e5e5;--border-strong:#d9d9d9;--text-primary:#0d0d0d;--text-secondary:#4b5563;--text-muted:#6b7280;--text-soft:#9ca3af;--button-primary:#000000;--button-primary-hover:#1f2937;--input-shadow:0 8px 28px rgba(0,0,0,0.08);--radius-large:24px}*{box-sizing:border-box}body,html{height:100%;margin:0;padding:0;overflow:hidden;background:var(--background);color:var(--text-primary);font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}button{cursor:pointer}.loginWrap{min-height:100vh;display:grid;place-items:center;padding:24px;background:#fff}.loginCard{width:100%;max-width:420px;padding:32px;border:1px solid var(--border);border-radius:18px;box-shadow:0 8px 30px rgba(0,0,0,.06);background:#fff}.loginBrand{font-size:28px;font-weight:600;text-align:center;margin-bottom:8px}.loginSubtitle{margin:0 0 28px;color:var(--text-muted);text-align:center;font-size:14px}.field{display:flex;flex-direction:column;gap:8px;margin-bottom:14px}.field label{font-size:13px;color:var(--text-secondary)}.field input{height:48px;border:1px solid #d1d5db;border-radius:10px;padding:0 14px;outline:none}.field input:focus{border-color:#111827;box-shadow:0 0 0 2px rgba(17,24,39,.08)}.pillButton{height:48px;width:100%;border:0;border-radius:999px;background:#111827;color:#fff;font-size:15px;font-weight:600;display:inline-flex;align-items:center;justify-content:center}.pillButton:hover{background:#000}.errorText{color:#dc2626;font-size:13px;margin:0 0 12px}.loginFootnote{margin:14px 0 0;color:var(--text-muted);font-size:12px;text-align:center}.appShell{width:100vw;background:#fff}.appShell,.sidebar{height:100vh;display:flex;overflow:hidden}.sidebar{width:260px;flex-shrink:0;background:var(--sidebar);border-right:1px solid var(--border);flex-direction:column}.sidebar-scroll{flex:1 1;overflow-y:auto;padding:12px 8px}.brandRow{display:flex;align-items:center;gap:8px;padding:10px 12px}.avatar,.brandIcon{display:grid;place-items:center;border-radius:50%}.brandIcon{font-size:14px}.avatar,.brandIcon{width:28px;height:28px;background:#111827;color:#fff}.avatar{font-size:11px;font-weight:700}.brand{font-size:18px;font-weight:600;letter-spacing:-.02em;color:var(--text-primary)}.sectionTitle,.smallLabel{font-size:13px}.sectionTitle{margin:18px 10px 6px;font-weight:600;color:var(--text-primary)}.sideList{display:flex;flex-direction:column;gap:4px}.chat-history-item,.sideItem{height:36px;width:100%;border:0;background:transparent;border-radius:8px;padding:0 10px;text-align:left;color:var(--text-primary);display:flex;align-items:center;gap:10px}.chat-history-item:hover,.sideItem:hover{background:var(--sidebar-hover)}.chat-history-item.active,.sideItem.active{background:var(--sidebar-active);font-weight:600}.chat-history-item{height:34px;font-size:14px;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.sidebarFooter{flex-shrink:0;border-top:1px solid var(--border);padding:10px;background:var(--sidebar)}.footerIdentity{display:flex;align-items:center;gap:10px;margin-bottom:10px}.inviteButton{height:36px;border:1px solid var(--border);background:#fff;border-radius:999px;font-size:13px;width:100%}.inviteButton:hover{background:#f3f4f6}.main-shell{flex:1 1;height:100vh;overflow:hidden;display:flex;flex-direction:column;background:#fff}.topBar{height:56px;flex-shrink:0;justify-content:space-between;padding:0 24px;border-bottom:1px solid transparent}.topBar,.topBarRight{display:flex;align-items:center}.topBarRight{gap:6px}.topAction{height:34px;border-radius:8px;padding:0 10px;background:transparent;border:none;font-size:14px;font-weight:600}.topAction:hover{background:#f3f4f6}.mobileMenuButton{display:none;position:fixed;left:12px;top:12px;z-index:60;width:40px;height:40px;border:1px solid var(--border);background:#fff;border-radius:10px}.mobileTitle{display:none;font-weight:600}.main-content{flex:1 1;overflow-y:auto;padding:24px}.centerColumn{max-width:760px;margin:0 auto;width:100%}.emptyState{padding-top:64px;flex-direction:column}.emptyState,.heroTitleRow{display:flex;align-items:center}.heroTitleRow{gap:10px;margin-bottom:22px}.heroTitleRow h1{margin:0;font-size:28px;font-weight:500;letter-spacing:-.03em}.heroIcon{width:28px;height:28px;display:grid;place-items:center;font-size:22px}.composer-shell{max-width:760px;margin:0 auto;width:100%}.composerWrap{width:100%;display:flex;flex-direction:column;gap:10px}.uploadStrip{display:flex;flex-wrap:wrap;gap:8px}.uploadChip{padding:8px 12px;border:1px solid var(--border);border-radius:999px;background:#fff;font-size:12px;color:var(--text-secondary)}.prompt-composer{width:100%;min-height:104px;background:#fff;border:1px solid var(--border-strong);border-radius:var(--radius-large);box-shadow:var(--input-shadow);padding:16px 18px 12px;display:flex;flex-direction:column;justify-content:space-between;position:relative}.prompt-composer textarea{width:100%;min-height:48px;border:0;outline:none;resize:none;font-size:16px;line-height:1.5;color:var(--text-primary);background:transparent}.prompt-composer textarea::placeholder{color:var(--text-muted)}.composerBar{display:flex;align-items:center;justify-content:space-between;margin-top:12px}.composerActions,.composerLeft{display:flex;align-items:center;gap:8px;position:relative}.iconChip{width:32px;height:32px;border-radius:50%;border:0;background:transparent;color:#444;font-size:24px;display:grid;place-items:center}.iconChip:hover{background:#f3f4f6}.thinkingPill{border:0;background:transparent;color:var(--text-muted);font-size:13px;display:flex;align-items:center;gap:4px;padding:8px 10px;border-radius:999px}.thinkingPill:hover{background:#f5f5f5}.sendCircle{width:36px;height:36px;border-radius:50%;border:0;background:var(--button-primary);color:#fff;display:grid;place-items:center;font-size:18px}.sendCircle:hover{background:var(--button-primary-hover)}.uploadMenu{position:absolute;left:0;top:42px;z-index:20;min-width:210px;background:#fff;border:1px solid var(--border);border-radius:14px;box-shadow:0 18px 50px rgba(0,0,0,.12);overflow:hidden}.uploadMenu button{display:block;width:100%;border:0;background:#fff;padding:10px 12px;text-align:left}.uploadMenu button:hover{background:#f7f7f7}.hiddenFile{display:none}.tabRow{margin-top:24px;display:flex;gap:8px}.tabPill{border:0;background:transparent;color:var(--text-muted);border-radius:999px;padding:9px 18px;font-size:14px;font-weight:500}.tabPill:hover{background:#f5f5f5}.tabPill.active{background:#f1f1f1;color:var(--text-primary);font-weight:600}.recentList{width:100%;margin-top:20px;display:flex;flex-direction:column;gap:4px}.recentRow{display:grid;grid-template-columns:1fr auto;grid-column-gap:16px;column-gap:16px;padding:10px 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var(--border);background:#fff;white-space:pre-wrap;line-height:1.5;margin-bottom:12px}.message.user{background:#f4f4f4;max-width:70%;margin-left:auto}.message.assistant{background:#fff;border-color:transparent;max-width:760px;padding-left:0;padding-right:0}.composer-area{flex-shrink:0;background:linear-gradient(0deg,#ffffff 82%,rgba(255,255,255,0));padding:16px 24px 18px}.disclaimer{margin-top:8px;text-align:center;font-size:12px;color:var(--text-muted)}.backdrop{display:none}@media (max-width:768px){.appShell{display:block}.mobileMenuButton{display:grid;place-items:center}.sidebar{transform:translateX(-100%);transition:transform .2s ease;z-index:55;width:280px;box-shadow:0 20px 60px rgba(0,0,0,.18);position:fixed;left:0;top:0}.sidebar.open{transform:translateX(0)}.backdrop{display:block;position:fixed;inset:0;background:rgba(0,0,0,.2);z-index:50}.main-shell{margin-left:0}.topBar{height:52px;padding:0 16px 0 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