:root{--paper:#f7f9fc;--ink:#1e3046;--muted:#687b8e;--line:#dce4ed;--blue:#235b91;--light:#e8f0f8;--white:#fff}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--paper);font-family:"Segoe UI","Microsoft YaHei","PingFang SC",sans-serif;font-size:15px}button,input,textarea{font:inherit}button{cursor:pointer;border:0;background:var(--blue);color:white;padding:12px 18px;border-radius:9px}button:disabled{opacity:.5;cursor:wait}button:hover:not(:disabled){filter:brightness(.94)}:focus-visible{outline:3px solid #719fca;outline-offset:3px}[hidden]{display:none!important}.wordmark{font-size:32px;font-weight:600;letter-spacing:-1.8px}.wordmark span{font-size:11px;vertical-align:top;margin:6px;color:#719fc7;display:inline-block}.login{min-height:100dvh;display:grid;grid-template-columns:1fr 1fr}.login-card{width:min(420px,100%);margin:auto;padding:40px}.login-card h1{font-size:38px;line-height:1.5;font-weight:500;letter-spacing:-1px;margin:55px 0 18px}.login-card p{color:var(--muted);line-height:1.8}.login-card form{display:grid;gap:12px;margin:32px 0 10px}.login-card label{font-size:13px}.login-card input{padding:14px;border:1px solid var(--line);border-radius:9px;background:white;min-width:0}.login-card small{color:var(--muted)}.login-art{position:relative;overflow:hidden;background:#dbe9f5;display:grid;place-items:center}.login-art span{z-index:1;position:absolute;bottom:10%;font-size:18px;color:#426a8c}.orbit{position:absolute;border:1px solid #a1bfd8;width:440px;height:620px;border-radius:50%;transform:rotate(-28deg)}.two{transform:rotate(28deg)}.three{width:330px;height:330px;background:#c3daed;border:0}.app{display:grid;grid-template-columns:260px 1fr;height:100dvh}aside{background:#edf2f8;border-right:1px solid var(--line);padding:28px 20px 18px;display:flex;flex-direction:column;min-height:0}.new{margin:35px 0 30px;text-align:left}.list-label{font-size:12px;color:var(--muted);margin:0 10px 12px}nav{flex:1;overflow:auto}nav button{display:block;width:100%;text-align:left;background:transparent;color:var(--muted);padding:13px 10px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin:3px 0}nav button.selected{background:#dae7f3;color:var(--ink)}.aside-footer{display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--line);padding-top:15px;font-size:12px;color:var(--muted)}.quiet{color:var(--muted);background:transparent;font-size:12px;padding:8px}main{display:flex;flex-direction:column;min-width:0;min-height:0}header{padding:20px 32px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);min-height:76px}header small{display:block;color:var(--muted);font-size:11px;margin-top:5px}.scroll{flex:1;overflow:auto;scroll-behavior:smooth}.welcome{max-width:760px;margin:clamp(40px,10vh,120px) auto 40px;padding:0 30px}.motif{font-size:54px;color:#668cb2}.welcome h1{font-size:34px;font-weight:500;letter-spacing:-1px;margin:22px 0 12px}.welcome p{color:var(--muted);line-height:1.8}.suggestions{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px}.suggestions button{background:white;color:var(--blue);border:1px solid var(--line);font-size:13px}.messages{max-width:820px;margin:auto;padding:28px 30px}.message{margin:0 0 28px}.message .who{font-size:12px;color:var(--muted);margin-bottom:9px}.message .text{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.85;max-width:75ch}.message.user{background:var(--light);padding:18px 22px;border-radius:14px 14px 3px 14px;margin-left:12%}.message.notice{color:#96503c;font-size:13px}.message.assistant{padding:5px 2px}footer{padding:0 30px 18px;width:100%;max-width:820px;margin:auto}#composer{position:relative;display:flex;align-items:flex-end;gap:10px;background:white;border:1px solid #bfcedd;padding:14px;border-radius:16px}textarea{resize:none;border:0;background:transparent;outline:none;width:100%;line-height:1.6;max-height:180px;min-height:52px;color:var(--ink)}#composer button{flex-shrink:0;padding:10px 15px}footer>small{display:block;text-align:center;font-size:11px;color:var(--muted);margin-top:12px}#status{font-size:12px;color:var(--muted);min-height:18px;margin:9px 4px}.error{color:#ad413c!important;font-size:13px;min-height:22px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}@media(max-width:720px){.login{grid-template-columns:1fr}.login-art{display:none}.login-card h1{margin-top:40px}.app{grid-template-columns:1fr;grid-template-rows:auto 1fr}aside{padding:10px 14px;display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;border-right:0}.wordmark{font-size:25px}.new{margin:0;justify-self:start;font-size:13px;padding:9px 14px}.list-label{display:none}nav{grid-column:1/-1;display:flex;overflow:auto;max-height:48px}nav button{width:auto;flex-shrink:0;max-width:180px;font-size:12px}.aside-footer{border:0;padding:0;grid-column:3;grid-row:1}.aside-footer span{display:none}header{padding:14px 20px;min-height:60px}.welcome{margin:35px auto 20px;padding:0 24px}.welcome h1{font-size:27px}.welcome p{font-size:13px}.messages{padding:20px}.message.user{margin-left:5%}footer{padding:0 14px 14px}.suggestions{gap:7px}.suggestions button{font-size:12px;padding:10px}footer>small{font-size:10px}}@media(prefers-reduced-motion:reduce){.scroll{scroll-behavior:auto}}