:root{--ink:#20332f;--muted:#71827c;--green:#146956;--mint:#eaf4ed;--line:#e3e9e4;--bg:#f6f7f3;--white:#fff;--amber:#ad7432}*{box-sizing:border-box}body{margin:0;font:15px/1.65 "Segoe UI","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink)}button,input,textarea,select{font:inherit}button{cursor:pointer;border:0;border-radius:10px;padding:11px 18px;background:#edf1eb;color:var(--ink)}button:hover{filter:brightness(.97)}button:disabled{opacity:.5;cursor:wait}input,textarea,select{width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--ink)}input:focus,textarea:focus,select:focus{outline:2px solid #a8cbbb;outline-offset:1px}textarea{resize:vertical;min-height:100px}label{display:block;margin:12px 0;color:#52655c;font-size:13px}label input,label select,label textarea{margin-top:6px}h1,h2,h3,p{margin-top:0}h2{font-size:25px;margin-bottom:0}h3{font-size:18px;margin-bottom:10px}.muted{color:var(--muted)}small{font-size:12px}.eyebrow{display:block;color:var(--green);font-size:11px;letter-spacing:2px;font-weight:700;margin-bottom:10px}.primary{background:var(--green);color:white}.quiet{background:transparent;color:var(--muted)}.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px}.brand b{background:var(--green);color:white;border-radius:11px;padding:3px 11px}.brand small{letter-spacing:2px;font-size:10px}.login-shell{min-height:100vh;display:grid;grid-template-columns:1fr 1fr;max-width:1400px;margin:auto}.login-story{background:#e7eee2;padding:70px;display:flex;flex-direction:column;justify-content:center}.login-story .brand{margin-bottom:95px}.login-story h1{font-size:46px;line-height:1.35;letter-spacing:-1px}.login-story p{color:#66776b}.story-chips{display:flex;gap:12px;margin-top:25px}.story-chips span{border:1px 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var(--line);background:#fff}.header-right{display:flex;gap:18px;align-items:center}.badge,.pill{border-radius:20px;background:var(--mint);color:var(--green);padding:4px 11px;font-size:12px}.badge.demo{background:#fff3db;color:var(--amber)}.avatar{border:1px solid var(--line);border-radius:50%;height:38px;width:38px;text-align:center;line-height:38px}main{padding:30px 42px;max-width:1400px}.hero{border-radius:18px;background:#e7eee2;padding:30px 34px;display:flex;justify-content:space-between;gap:20px}.hero h1{font-size:30px;line-height:1.4;margin-bottom:12px}.hero p{color:#607468;margin-bottom:0}.hero-symbol{font-size:68px;color:#7d9c81;align-self:center;padding:0 25px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:22px 0}.card{background:white;border:1px solid var(--line);border-radius:14px;padding:24px}.card.clickable{cursor:pointer}.card.clickable:hover{border-color:#85ac99}.card-icon{font-size:23px;width:45px;height:45px;display:grid;place-items:center;border-radius:12px;background:var(--mint);margin-bottom:20px}.card p{font-size:13px;color:var(--muted)}.card a{color:var(--green)}.section-head{display:flex;justify-content:space-between;gap:12px;align-items:center;margin:28px 0 14px}.split{display:grid;grid-template-columns:290px minmax(0,1fr);gap:20px}.panel{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px}.notice{border-left:3px solid #bf9255;background:#fbf5e9;padding:12px 16px;font-size:13px;color:#826132;margin-bottom:18px;border-radius:5px}.thread-list{max-height:370px;overflow:auto;display:grid;gap:8px}.thread-item{padding:12px;text-align:left;font-size:13px;width:100%;background:#f6f8f4}.thread-item.selected{background:var(--mint);color:var(--green)}.chat-title{display:flex;align-items:center;justify-content:space-between;gap:10px;padding-bottom:14px;border-bottom:1px solid var(--line)}.chat-log{height:420px;overflow:auto;padding:20px 0;display:flex;flex-direction:column;gap:16px}.bubble{max-width:92%;padding:14px 17px;background:#f0f4ee;border-radius:12px;white-space:pre-wrap;overflow-wrap:anywhere;font-size:14px}.bubble.user{align-self:flex-end;background:var(--green);color:#fff}.bubble.assistant{align-self:flex-start}.bubble .speaker{font-size:11px;margin-bottom:6px;opacity:.6}.composer{display:flex;gap:10px;align-items:flex-end;border-top:1px solid var(--line);padding-top:15px}.composer textarea{min-height:70px;max-height:180px}.composer 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#bbccbe;padding:15px;border-radius:10px}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#263e34;color:white;padding:12px 22px;border-radius:12px;z-index:100;max-width:90%}[hidden]{display:none!important}@media(max-width:1000px){main{padding:25px}.grid{grid-template-columns:1fr 1fr}.split{grid-template-columns:230px minmax(0,1fr)}header{padding:24px}.sidebar{width:190px}.workspace{margin-left:190px}}@media(max-width:700px){.login-shell{display:block}.login-story{padding:30px}.login-story .brand{margin-bottom:28px}.login-story h1{font-size:30px}.login-card{margin:25px auto}.sidebar{position:static;width:100%;padding:15px}.sidebar .brand{font-size:17px}.nav-label,.sidebar-bottom{display:none}nav{display:flex;overflow:auto;gap:3px;margin-top:12px}nav button{white-space:nowrap;font-size:12px;padding:9px 11px}.workspace{margin:0}header{padding:18px}header h2{font-size:22px}.eyebrow{font-size:10px}main{padding:18px}.grid,.split{grid-template-columns:1fr}.hero{padding:23px}.hero h1{font-size:25px}.hero-symbol{display:none}.card{padding:20px}.card-icon{margin-bottom:12px}.thread-list{max-height:150px}.chat-log{height:360px}.form-row{grid-template-columns:1fr}.composer{flex-direction:column;align-items:stretch}.header-right{gap:8px}.avatar{display:none}}