:root{font-family:system-ui,-apple-system,"Microsoft YaHei",sans-serif;color:#302b25;background:#f6f1e8;font-size:16px;line-height:1.55;--accent:#a9472b;--border:#ddd5c9;--muted:#6e6358}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button{cursor:pointer;min-height:44px;border:1px solid var(--border);border-radius:12px;background:#fffaf3;color:inherit;padding:9px 14px}button:disabled{cursor:wait;opacity:.55}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #277c78;outline-offset:2px}button:hover{background:#eee4d7}.primary{background:var(--accent);color:white;border-color:var(--accent);font-weight:650}.primary:hover{background:#8f3820}.quiet{background:transparent}.muted,.footnote{color:var(--muted)}h1,h2,p{margin:0}h1{font-size:30px;line-height:1.3}h2{font-size:19px}.eyebrow{font-size:12px;font-weight:700;letter-spacing:.12em;color:var(--muted);margin-bottom:6px}.brand{font-size:44px;font-weight:800;color:var(--accent)}.brand span{font-size:18px;color:#302b25}.login{max-width:480px;margin:8vh auto;padding:28px}.login h1{margin:30px 0 18px;font-size:36px}.login form{display:grid;gap:12px;margin:30px 0 16px}.login input{width:100%;padding:14px;border:1px solid var(--border);border-radius:12px;background:#fffaf3}.footnote{font-size:13px;margin-top:24px}[role=alert]{color:#a32b20;font-size:14px;overflow-wrap:anywhere}.login [role=alert]{margin-top:10px}[hidden]{display:none!important}#workspace{height:100dvh;display:flex;max-width:1280px;margin:auto;background:#fbf8f2}#sidebar{width:320px;flex-shrink:0;border-right:1px solid var(--border);overflow:auto;padding:24px 16px}header{display:flex;align-items:center;justify-content:space-between;gap:12px}.connection{font-size:13px;color:#27635f;margin:18px 0}nav{display:flex;gap:8px;margin-bottom:22px}nav button{flex:1}nav button[aria-pressed=true]{background:#e9dccc;border-color:#b8a28a;font-weight:650}.conversation{display:flex;text-align:left;align-items:center;width:100%;gap:12px;margin-bottom:10px;padding:14px 12px;background:transparent}.conversation.active{background:#eee4d7;border-color:#c9ad91}.avatar{display:grid;place-items:center;flex-shrink:0;width:44px;height:44px;background:#e8d9c5;border-radius:14px;color:#64452e;font-weight:700}.conversation-copy{flex:1;min-width:0}.conversation-copy strong{display:block;overflow-wrap:anywhere}.conversation-copy small{display:block;color:var(--muted);margin-top:2px}.badge{background:var(--accent);color:white;font-size:12px;border-radius:12px;padding:2px 7px}#chat{min-width:0;flex:1;display:flex;flex-direction:column}#chat header{padding:16px 20px;border-bottom:1px solid var(--border);justify-content:flex-start;background:#fbf8f2}.heading{min-width:0}.heading h2{overflow-wrap:anywhere}.heading p{font-size:12px}#back{display:none}#messages{flex:1;overflow:auto;padding:24px 20px;overscroll-behavior:contain}#older{display:block;margin:0 auto 20px}.message{margin:0 0 22px;max-width:88%;width:fit-content}.message.me{margin-left:auto}.message .byline{font-size:12px;color:var(--muted);margin-bottom:6px}.message.me .byline{text-align:right}.bubble{background:white;border:1px solid var(--border);border-radius:4px 16px 16px 16px;padding:12px 15px;white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.7}.me .bubble{background:#e5eee8;border-color:#c3d4c9;border-radius:16px 4px 16px 16px}.system .bubble{background:#f0e9df;color:#625549;font-size:14px}.system{max-width:100%}#chat-status{font-size:12px;color:var(--muted);padding:0 20px 8px;min-height:24px}#composer{border-top:1px solid var(--border);padding:12px 20px max(16px,env(safe-area-inset-bottom));background:#fbf8f2}#composer>label{font-size:13px;color:var(--muted)}select{max-width:calc(100% - 45px);margin:0 0 10px 8px;padding:8px;border:1px solid var(--border);border-radius:9px;background:white;min-height:44px}.compose-row{display:flex;gap:10px;align-items:flex-end}textarea{flex:1;min-width:0;max-height:160px;resize:vertical;padding:12px;border:1px solid var(--border);border-radius:12px;background:white}#send{min-width:68px}#send-error{margin-top:8px}#retry-bar{margin-top:10px;font-size:13px}#retry-bar button{margin:8px 8px 0 0;font-size:13px}#welcome{flex:1;align-self:center;text-align:center;padding:24px}#welcome h2{margin:12px 0}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}@media(max-width:700px){#workspace{width:100%}#sidebar{width:100%;border:0;padding-top:max(22px,env(safe-area-inset-top))}#workspace.chat-open #sidebar{display:none}#welcome{display:none}#chat{width:100%}#back{display:block;flex-shrink:0}#chat header{padding:10px 12px;padding-top:max(10px,env(safe-area-inset-top))}#messages{padding:18px 12px}#composer{padding-left:12px;padding-right:12px}.message{max-width:94%}#chat-status{padding-left:12px}}@media(prefers-reduced-motion:no-preference){button{transition:background .15s ease}}