:root{--bg:#f7f8fb;--ink:#17202a;--muted:#617084;--line:#d9e0ea;--panel:#fff;--accent:#176c68;--accent-strong:#0c4f4b;--warn:#a65b00}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input,textarea{font:inherit}.shell{display:grid;grid-template-columns:260px minmax(420px,1fr) 360px;min-height:100vh}.rail,.side{background:var(--panel);border-right:1px solid var(--line);padding:18px}.side{border-right:0;border-left:1px solid var(--line)}.brand{font-size:18px;font-weight:700;margin-bottom:22px}.section-title{color:var(--muted);font-size:12px;font-weight:700;letter-spacing:0;margin:22px 0 8px;text-transform:uppercase}.pill{align-items:center;background:#edf4f3;border:1px solid #c8dddd;border-radius:8px;color:var(--accent-strong);display:flex;justify-content:space-between;padding:8px 10px}.main{display:grid;grid-template-rows:auto 1fr auto;min-width:0}.topbar{align-items:center;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;padding:16px 20px}.topbar h1{font-size:18px;margin:0}.upload{display:flex;gap:8px}.button{align-items:center;background:var(--accent);border:0;border-radius:8px;color:#fff;cursor:pointer;display:inline-flex;gap:8px;min-height:38px;padding:0 12px}.button.secondary{background:#eef2f6;color:var(--ink)}.conversation{overflow:auto;padding:20px}.message{background:var(--panel);border:1px solid var(--line);border-radius:8px;margin:0 0 12px;max-width:820px;padding:14px 16px}.message pre{margin:0;white-space:pre-wrap}.message.user{background:#eaf3f2;margin-left:auto}.tool-trace{border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:6px;margin-top:12px;padding-top:10px}.tool-call{background:#f4f7fa;border:1px solid var(--line);border-radius:6px;color:var(--muted);font-size:12px;padding:4px 7px}.composer{border-top:1px solid var(--line);display:grid;grid-gap:10px;gap:10px;grid-template-columns:1fr auto;padding:14px 20px}.composer textarea{min-height:54px;resize:vertical}.card,.composer textarea{border:1px solid var(--line);border-radius:8px;padding:12px}.card{background:var(--panel);margin-bottom:10px}.card h3{font-size:15px;margin:0 0 6px}.small{color:var(--muted);font-size:13px;line-height:1.45}.error{color:var(--warn)}@media (max-width:980px){.shell{grid-template-columns:1fr}.rail,.side{border:0}}