.bbac-widget{
  position: relative;
  max-width: 720px;
  margin: 1rem auto;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.05);
  overflow: hidden;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial;
  background: #fff;
  z-index: 9999;
}
/* Floating bubble mode */
.bbac-floating{
  position: fixed;
  right: 20px;
  bottom: 20px;
  max-width: 420px;
  width: 90%;
  margin: 0;
  border: none;
  box-shadow: 0 14px 40px rgba(0,0,0,0.15);
}
.bbac-floating .bbac-panel{ display:none; border:1px solid #e5e7eb; border-radius:16px; overflow:hidden; }
.bbac-fab{
  display:none;
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background:#111827;
  color:#fff;
  border:0;
  cursor:pointer;
  font-size: 22px;
  box-shadow: 0 10px 24px rgba(0,0,0,0.2);
}
.bbac-header{display:flex; align-items:center; justify-content:space-between; padding:12px 16px; border-bottom:1px solid #f0f2f5; background:#fafafa;}
.bbac-title{font-weight:600;}
.bbac-actions{display:flex; gap:8px;}
.bbac-clear,.bbac-close{border:0; background:#f3f4f6; border-radius:10px; padding:6px 10px; cursor:pointer;}
.bbac-messages{height:380px; overflow:auto; padding:16px; background:#fff;}
.bbac-msg{display:flex; margin-bottom:10px;}
.bbac-msg.user{justify-content:flex-end;}
.bbac-bubble{max-width:80%; padding:10px 12px; border-radius:12px; line-height:1.4; white-space:pre-wrap;}
.bbac-msg.user .bbac-bubble{background:#2563eb; color:#fff; border-bottom-right-radius:4px;}
.bbac-msg.assistant .bbac-bubble{background:#f3f4f6; color:#111827; border-bottom-left-radius:4px;}
.bbac-bubble.loading{opacity:0.8; font-style:italic;}
.bbac-inputrow{display:flex; gap:8px; padding:12px; border-top:1px solid #f0f2f5; background:#fafafa;}
#bbac-input{flex:1; padding:10px 12px; border:1px solid #e5e7eb; border-radius:10px;}
.bbac-send{border:0; background:#111827; color:#fff; padding:10px 14px; border-radius:10px; cursor:pointer;}
.bbac-powered{font-size:12px; padding:6px 12px; color:#6b7280; text-align:right;}

.bbac-sources{padding:8px 12px 0 12px;}
.bbac-sources-title{font-size:12px; color:#6b7280; margin-bottom:4px;}
.bbac-sources-list{margin:0; padding-left:18px;}
.bbac-sources-list li{margin:2px 0;}