:root{
  --navy:#003087; --red:#C8102E; --ink:#1b2430; --muted:#66707d;
  --bg:#f4f6fb; --card:#ffffff; --line:#e3e8f0; --good:#1e8e5a; --bad:#c8102e;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);
  font:15px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
.wrap{max-width:720px;margin:0 auto;min-height:100vh;display:flex;flex-direction:column}
.topbar{display:flex;align-items:center;justify-content:space-between;padding:16px 18px;
  background:var(--navy);color:#fff}
.brand{display:flex;align-items:center;gap:10px}
.dot{width:10px;height:10px;border-radius:50%;background:#4ade80;box-shadow:0 0 0 3px rgba(74,222,128,.25)}
.brand-name{font-weight:700;font-size:16px}
.brand-sub{font-size:12px;opacity:.85}
.badge{font-size:12px;padding:4px 10px;border-radius:999px;background:rgba(255,255,255,.15)}
main{flex:1;padding:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;
  box-shadow:0 1px 2px rgba(20,30,60,.04)}
.card h2{margin:0 0 6px;font-size:18px}
.muted{color:var(--muted);font-size:13px;margin:0 0 14px}
label{display:block;font-size:12px;color:var(--muted);margin:10px 0 4px;font-weight:600}
input{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:9px;font-size:14px;background:#fbfcfe}
input:focus{outline:2px solid var(--navy);outline-offset:1px}
.btn{display:inline-block;padding:10px 16px;border-radius:9px;border:none;font-size:14px;
  font-weight:600;cursor:pointer;text-decoration:none;text-align:center}
.btn.primary{background:var(--navy);color:#fff}
.btn.primary:hover{background:#00246b}
.btn.ghost{background:transparent;color:var(--navy);border:1px solid var(--line)}
.btn.small{padding:6px 10px;font-size:12px}
.hidden{display:none !important}
.msg-error{color:var(--bad);font-size:13px;margin-top:10px;min-height:1em}

.thread{display:flex;flex-direction:column;gap:10px;max-height:56vh;overflow-y:auto;padding-bottom:6px}
.bubble{max-width:86%;padding:10px 13px;border-radius:12px;font-size:14px;white-space:pre-wrap}
.bubble.agent{align-self:flex-start;background:#eef1fb;border:1px solid var(--line)}
.bubble.user{align-self:flex-end;background:var(--navy);color:#fff}
.bubble.system{align-self:center;background:transparent;color:var(--muted);font-size:12px}
.bubble.error{align-self:flex-start;background:#fdecec;border:1px solid #f6c6c6;color:#7a1420}

.pane{border:1px dashed var(--line);border-radius:12px;padding:14px;margin:12px 0;display:flex;
  flex-wrap:wrap;gap:8px;align-items:center}
.pane img{width:120px;border-radius:6px;border:1px solid var(--line);background:#fff}
.pane input{flex:1;min-width:120px}
#pickPane{flex-direction:column;align-items:stretch}
#pickPane button{text-align:left}

.composer{display:flex;gap:8px;margin-top:14px}
.composer input{flex:1}

.foot{padding:14px 18px 24px;font-size:11px;color:var(--muted);text-align:center}