:root{color:#202426;background:#f5f2ed;font-family:Inter,PingFang SC,Microsoft YaHei,system-ui,sans-serif}*{box-sizing:border-box}body{margin:0}button,textarea,summary{font:inherit}button{cursor:pointer}button:disabled,textarea:disabled{cursor:not-allowed}.app-shell{min-height:100vh;display:grid;grid-template-columns:232px minmax(0,1fr)}.sidebar{border-right:1px solid #d9d2c8;background:#fbfaf7;padding:20px}.brand{font-size:20px;font-weight:700;margin-bottom:24px}.nav-item{width:100%;border:0;background:transparent;text-align:left;padding:11px 12px;border-radius:8px;color:#3a4145;margin-bottom:4px}.nav-item.active{background:#e9e1d6;color:#171a1c;font-weight:700}.nav-item:disabled{color:#9a938b}.nav-item:hover{background:#f0ebe4}.privacy-note{margin-top:20px;border-top:1px solid #e4ded5;padding-top:14px;color:#5f6764;font-size:13px;line-height:1.65}.privacy-note summary{cursor:pointer;color:#263332;font-weight:800}.privacy-note p{margin:10px 0 0}.workspace{min-width:0;background:#f5f2ed}.feature-panel{min-height:100vh;padding:26px clamp(18px,4vw,48px);background:#f8f6f1}.feature-panel h1{max-width:720px;margin:0 0 12px;color:#171a1c;font-size:clamp(26px,4vw,40px);line-height:1.1}.feature-panel p:last-child{max-width:720px;margin:0;color:#4f5854;font-size:17px;line-height:1.7}.chat-panel{min-height:100vh;display:grid;grid-template-rows:auto minmax(0,1fr) auto auto}.chat-header{display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid #d9d2c8;padding:22px clamp(18px,4vw,48px) 18px;background:#f8f6f1}.chat-kicker{margin:0 0 6px;color:#6e766f;font-size:12px;font-weight:800;letter-spacing:0}.chat-header h1{margin:0;font-size:clamp(26px,4vw,40px);line-height:1.1}.clear-chat-button{min-height:38px;display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid #d2cac0;border-radius:8px;padding:0 13px;background:#fffdfa;color:#48514d;font-weight:800;white-space:nowrap}.clear-chat-button:hover{border-color:#bcaea1;color:#263332}.message-list{min-height:0;overflow-y:auto;padding:24px clamp(18px,4vw,48px)}.empty-state{margin:0;color:#74706a;font-size:18px}.message{max-width:760px;margin:0 0 18px;overflow-wrap:anywhere;word-break:break-word}.message-user{margin-left:auto}.message-author{display:block;margin-bottom:6px;color:#68716d;font-size:13px;font-weight:700}.message p{margin:0;border:1px solid #d9d2c8;border-radius:8px;padding:12px 14px;background:#fffdfa;color:#202426;line-height:1.65;white-space:pre-wrap}.message-user p{background:#263332;border-color:#263332;color:#fff}.chat-error{margin:0;padding:0 clamp(18px,4vw,48px) 12px;color:#a33b2f;font-weight:700}.chat-form{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:end;border-top:1px solid #d9d2c8;padding:16px clamp(18px,4vw,48px) 18px;background:#fbfaf7}.chat-form textarea{width:100%;min-height:76px;max-height:180px;resize:vertical;border:1px solid #cfc7bd;border-radius:8px;padding:12px 14px;background:#fffdfa;color:#202426;line-height:1.5}.chat-form textarea:focus{border-color:#64746f;outline:3px solid #d8e1dd}.send-button{min-height:44px;display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:8px;padding:0 18px;background:#263332;color:#fff;font-weight:800}.send-button:disabled{background:#b9b4ad;color:#f5f2ed}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:720px){.app-shell{grid-template-columns:1fr}.sidebar{display:flex;gap:8px;overflow-x:auto;border-right:0;border-bottom:1px solid #d9d2c8;padding:12px}.brand{min-width:max-content;margin-bottom:0;align-self:center}.nav-item{width:auto;min-width:max-content;margin-bottom:0}.privacy-note{min-width:220px;margin-top:0;border-top:0;border-left:1px solid #e4ded5;padding:0 0 0 12px;align-self:center}.chat-panel{min-height:calc(100vh - 61px)}.chat-header{align-items:flex-start;flex-direction:column}.chat-form{grid-template-columns:1fr}.send-button{width:100%}}