:root{color-scheme:light;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#f5f7fb;color:#172033}*{box-sizing:border-box}body{margin:0}button,input,textarea{font:inherit}.shell{min-height:100vh;display:grid;grid-template-columns:280px minmax(0,1fr);background:#f5f7fb}.rail{border-right:1px solid #d9e2ee;background:#fff;padding:18px}.brand{display:flex;align-items:center;gap:10px;font-weight:800}.mark{width:32px;height:32px;display:grid;place-items:center;background:#132238;color:#fff;border-radius:7px}.main{min-width:0;display:grid;grid-template-rows:auto minmax(0,1fr) auto}.topbar{min-height:68px;border-bottom:1px solid #d9e2ee;background:hsla(0,0%,100%,.88);display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 22px}.topbar h1{margin:0;font-size:18px}.topbar span{color:#64748b;font-size:12px}.status{border-radius:999px;padding:5px 9px;background:#e7f5f1;color:#0f766e;font-size:12px;font-weight:800}.messages{overflow:auto;padding:22px;display:flex;flex-direction:column;gap:12px}.message{max-width:860px;border:1px solid #dce5ef;background:#fff;border-radius:8px;padding:14px 15px;box-shadow:0 14px 34px rgba(29,53,87,.08)}.message.user{align-self:flex-end;background:#132238;border-color:#132238;color:#fff}.message.tool{border-color:#b7d7ff;background:#f1f7ff}.message.error{border-color:#f4b8b4;background:#fff4f2}.message strong{display:block;margin-bottom:6px;font-size:12px}.message p{white-space:pre-wrap;line-height:1.5;margin:0}.composer{border-top:1px solid #d9e2ee;background:hsla(0,0%,100%,.9);padding:16px 22px 18px}.composer textarea{width:100%;min-height:110px;max-height:260px;resize:vertical;border:1px solid #bcc8d8;border-radius:8px;padding:13px 14px;outline:none}.composer footer{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:10px}.composer button{height:38px;border:0;border-radius:7px;background:#0f766e;color:#fff;font-weight:800;padding:0 16px;cursor:pointer}@media (max-width:760px){.shell{grid-template-columns:1fr}.rail{border-right:0;border-bottom:1px solid #d9e2ee}.composer,.messages{padding-left:14px;padding-right:14px}}