:root{--brand:#3b82f6;--brand-dark:#2563eb;--brand-soft:#eff6ff;--nav-bg:#fbfcfe;--text:#1a2332;--body-text:#475569;--muted:#64748b;--subtle:#94a3b8;--border:#e8ecf0;--warning-bg:#fff8e1;--warning-border:#fde68a;--warning-text:#92400e;--sidebar-width:220px;--header-height:64px;--composer-height:96px}*{box-sizing:border-box}html,body{width:100%;height:100%;margin:0;overflow:hidden}body{color:var(--text);-webkit-font-smoothing:antialiased;background:#fff;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Arial,sans-serif}button,textarea,input{font:inherit}button{border:0}button:focus-visible,textarea:focus-visible{outline-offset:2px;outline:3px solid #3b82f638}.mobileMenuButton,.sidebarCloseButton,.mobileSidebarBackdrop{display:none}.appShell{background:#fff;width:100vw;height:100dvh;display:flex;overflow:hidden}.sidebar{flex:0 0 var(--sidebar-width);width:var(--sidebar-width);background:var(--nav-bg);border-right:1px solid var(--border);flex-direction:column;height:100dvh;display:flex;overflow:hidden}.brand{height:var(--header-height);border-bottom:1px solid var(--border);align-items:center;gap:10px;padding:0 20px;display:flex}.brandMark{color:#fff;background:var(--brand);border-radius:50%;place-items:center;width:32px;height:32px;font-size:17px;font-weight:700;display:grid;box-shadow:0 6px 14px #3b82f638}.brandName{letter-spacing:-.3px;font-size:19px;font-weight:750}.newChatWrap{padding:16px 14px 10px}.newChatButton{border:1px solid var(--brand);width:100%;min-height:42px;color:var(--brand-dark);cursor:pointer;background:#fff;border-radius:10px;justify-content:center;align-items:center;gap:8px;font-weight:600;transition:all .16s;display:flex}.newChatButton:hover{background:var(--brand-soft)}.newChatIcon{font-size:19px;line-height:1}.sidebarScroll{flex-direction:column;flex:1;min-height:0;padding:0 10px 14px;display:flex;overflow:hidden}.sidebarSection{margin-top:15px}.historySection{flex-direction:column;flex:1;min-height:150px;display:flex;overflow:hidden}.categorySection{flex:none;margin-top:14px}.sidebarTitle{color:var(--subtle);margin:0 0 8px;padding:0 10px;font-size:12px;font-weight:600}.sidebarList{flex-direction:column;gap:3px;display:flex}.historyList{overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:#cbd5e1 transparent;flex:1;min-height:0;padding-right:3px;overflow-y:auto}.historyList::-webkit-scrollbar{width:5px}.historyList::-webkit-scrollbar-track{background:0 0}.historyList::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:999px}.historyEmpty{color:var(--subtle);padding:7px 10px 12px;font-size:12px}.historyItem,.categoryItem{width:100%;min-height:40px;color:var(--body-text);cursor:pointer;text-align:left;background:0 0;border-radius:9px;align-items:center;gap:10px;padding:8px 10px;transition:all .15s;display:flex}.historyItem{flex:0 0 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18px;font-size:12px;display:flex}.statusDot,.connectedBadgeDot{background:#22c55e;border-radius:999px;width:8px;height:8px;box-shadow:0 0 0 4px #22c55e1f}.mainPanel{background:#fff;flex-direction:column;flex:1;min-width:0;height:100dvh;display:flex;overflow:hidden}.topHeader{flex:0 0 var(--header-height);height:var(--header-height);border-bottom:1px solid var(--border);z-index:20;background:#fff;justify-content:space-between;align-items:center;padding:0 30px;display:flex}.topHeader h1{margin:0;font-size:18px;font-weight:720}.topHeader p{color:var(--subtle);margin:3px 0 0;font-size:12px}.mainScroll{overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:#dbe2ea transparent;background:linear-gradient(#fff 0 65%,#fbfdff 100%);flex:1;min-height:0;overflow-y:auto}.viewContent{width:min(900px,100% - 48px);margin:0 auto}.welcomeView{padding:clamp(42px,8vh,80px) 0 42px}.welcomeCard{border:1px solid var(--border);background:#fff;border-radius:16px;padding:31px 32px;box-shadow:0 6px 20px #0f172a0a}.connectedBadge{color:#166534;background:#f0fdf4;border-radius:999px;align-items:center;gap:9px;padding:7px 11px;font-size:12px;font-weight:600;display:inline-flex}.connectedBadgeDot{width:7px;height:7px;box-shadow:none}.welcomeCard h1{letter-spacing:-.7px;margin:20px 0 10px;font-size:clamp(26px,3vw,34px);line-height:1.25}.welcomeCard p{max-width:720px;color:var(--muted);margin:0;font-size:15px;line-height:1.8}.questionGrid{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:22px;display:grid}.questionCard{border:1px solid var(--border);min-height:68px;color:var(--body-text);cursor:pointer;text-align:left;background:#fff;border-radius:12px;justify-content:space-between;align-items:center;gap:16px;padding:15px 18px;transition:all .17s;display:flex}.questionCard:hover{color:var(--brand-dark);border-color:#bfdbfe;transform:translateY(-2px);box-shadow:0 7px 20px #0f172a0f}.questionArrow{color:#cbd5e1;font-size:22px}.categoryView{padding:58px 0 44px}.categoryHeader{align-items:center;gap:16px;display:flex}.categoryHeadingIcon{width:48px;height:48px;color:var(--brand-dark);background:var(--brand-soft);border:1px solid #bfdbfe;border-radius:13px;place-items:center;font-size:17px;font-weight:700;display:grid}.categoryHeader h1{margin:0 0 6px;font-size:25px}.categoryHeader p{color:var(--muted);margin:0;font-size:15px}.chatView{min-height:100%;padding:28px 0 42px}.chatList{flex-direction:column;gap:24px;display:flex}.messageRow{width:100%;display:flex}.userRow{justify-content:flex-end}.assistantRow{justify-content:flex-start}.userBubble{color:#fff;background:var(--brand);white-space:pre-wrap;border-radius:16px 16px 4px;max-width:min(78%,680px);padding:12px 17px;font-size:15px;line-height:1.7;box-shadow:0 5px 15px #3b82f62e}.assistantColumn{width:min(100%,820px)}.assistantIdentity{color:var(--muted);align-items:center;gap:8px;margin:0 0 8px 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var(--composer-height);min-height:var(--composer-height);border-top:1px solid var(--border);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);z-index:30;background:#fffffff5;padding:12px 24px}.composerInner{width:min(900px,100%);margin:0 auto}.composerBox{background:#fff;border:1px solid #d9e0e8;border-radius:13px;align-items:flex-end;gap:9px;min-height:51px;padding:6px 7px 6px 15px;display:flex;box-shadow:0 4px 15px #0f172a0d}.composerBox:focus-within{border-color:#93b4f8;box-shadow:0 0 0 3px #3b82f61a,0 4px 15px #0f172a0d}.composer textarea{resize:none;min-height:38px;max-height:112px;color:var(--text);background:0 0;border:0;outline:0;flex:1;padding:8px 0 6px;font-size:14px;line-height:1.55;overflow-y:auto}.composer textarea::placeholder{color:var(--subtle)}.sendButton{color:#fff;background:var(--brand);cursor:pointer;border-radius:9px;flex:0 0 39px;place-items:center;width:39px;height:39px;transition:all .15s;display:grid}.sendButton:not(:disabled):hover{background:var(--brand-dark);transform:translateY(-1px)}.sendButton:disabled{cursor:not-allowed;opacity:.42}.composerInner>p{color:var(--subtle);text-align:center;margin:6px 0 0;font-size:11px}.dialogBackdrop{-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);z-index:100;background:#0f172a6b;place-items:center;padding:20px;display:grid;position:fixed;inset:0}.feedbackDialog{border:1px solid var(--border);background:#fff;border-radius:16px;width:min(440px,100%);overflow:hidden;box-shadow:0 24px 70px #0f172a38}.feedbackDialog>header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:flex-start;gap:20px;padding:21px 22px 16px;display:flex}.feedbackDialog h2{margin:0;font-size:18px}.feedbackDialog header p{color:var(--muted);margin:6px 0 0;font-size:13px}.dialogClose{width:31px;height:31px;color:var(--muted);cursor:pointer;background:#f5f7fa;border-radius:8px;font-size:20px}.feedbackOptions{flex-direction:column;gap:8px;padding:17px 22px;display:flex}.feedbackOptions label{border:1px solid var(--border);min-height:42px;color:var(--body-text);cursor:pointer;border-radius:9px;align-items:center;gap:10px;padding:9px 11px;font-size:14px;display:flex}.feedbackOptions label:has(input:checked){color:var(--brand-dark);background:var(--brand-soft);border-color:#93b4f8}.feedbackOptions input{accent-color:var(--brand)}.feedbackDialog>footer{justify-content:flex-end;gap:9px;padding:14px 22px 20px;display:flex}.secondaryButton,.primaryButton{cursor:pointer;border-radius:9px;min-height:39px;padding:0 15px}.secondaryButton{color:var(--body-text);background:#f3f5f8}.primaryButton{color:#fff;background:var(--brand)}.primaryButton:disabled{cursor:not-allowed;opacity:.45}.toast{color:#fff;z-index:120;background:#0f172aeb;border-radius:9px;padding:9px 13px;font-size:12px;position:fixed;bottom:116px;left:50%;transform:translate(-50%);box-shadow:0 8px 25px #0f172a2e}@media (max-width:860px){:root{--sidebar-width:76px}.sidebarLabel,.brandName,.sidebarTitle,.historyEmpty{display:none}.brand,.newChatButton,.historyItem,.categoryItem,.knowledgeStatus{justify-content:center}.brand{padding:0}.newChatWrap{padding:14px 10px 9px}.newChatButton{width:44px;margin:0 auto}.sidebarScroll{padding-left:8px;padding-right:8px}.historySection{min-height:120px}.historyItem,.categoryItem{padding:8px}}@media (max-width:660px){:root{--composer-height:102px}.sidebar{z-index:90;width:min(84vw,320px);height:100dvh;transition:transform .22s;display:flex;position:fixed;inset:0 auto 0 0;transform:translate(-105%);box-shadow:12px 0 32px #0f172a2e}.sidebarOpen{transform:translate(0)}.sidebarLabel,.brandName,.sidebarTitle,.historyEmpty{display:block}.brand,.newChatButton,.historyItem,.categoryItem,.knowledgeStatus{justify-content:flex-start}.brand{padding:0 16px 0 20px}.newChatWrap{padding:16px 14px 10px}.newChatButton{width:100%;margin:0}.sidebarScroll{padding:0 10px 14px}.historySection{min-height:150px}.historyItem,.categoryItem{padding:8px 10px}.sidebarCloseButton{width:34px;height:34px;color:var(--muted);cursor:pointer;background:#eef2f7;border-radius:9px;flex:0 0 34px;place-items:center;margin-left:auto;font-size:23px;line-height:1;display:grid}.mobileSidebarBackdrop{z-index:80;cursor:default;background:#0f172a61;width:100%;height:100%;padding:0;display:block;position:fixed;inset:0}.mobileMenuButton{border:1px solid var(--border);width:38px;height:38px;color:var(--text);cursor:pointer;background:#fff;border-radius:10px;flex:0 0 38px;place-items:center;padding:0;font-size:22px;line-height:1;display:grid;box-shadow:0 3px 10px #0f172a0f}.topHeader{gap:11px;padding:0 14px}.topHeaderCopy{min-width:0}.topHeader h1{text-overflow:ellipsis;white-space:nowrap;font-size:17px;overflow:hidden}.topHeader p{display:none}.viewContent{width:min(100% - 28px,900px)}.welcomeView{padding-top:30px}.welcomeCard{padding:24px 22px}.questionGrid{grid-template-columns:1fr}.categoryView{padding-top:32px}.chatView{padding-top:20px}.userBubble{max-width:88%}.answerCard{padding:18px 16px 15px}.answerFooter{flex-direction:column;align-items:flex-start}.composer{padding-right:14px;padding-bottom:calc(12px + env(safe-area-inset-bottom));padding-left:14px}}@media (max-height:700px){:root{--header-height:56px;--composer-height:88px}.welcomeView{padding-top:28px}.welcomeCard{padding:22px 25px}.welcomeCard h1{margin-top:13px;font-size:26px}.questionCard{min-height:58px;padding-top:12px;padding-bottom:12px}.composer{padding-top:8px;padding-bottom:8px}.composerInner>p{display:none}}