#bk-chat-bubble{
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 60px; height: 60px;
  border-radius: 50%;
  border: none;
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
  display:flex;align-items:center;justify-content:center;
  cursor: pointer;
  z-index: 2147483000;
}
#bk-chat-wrap.pos-left #bk-chat-bubble{ right:auto; left:20px; }

#bk-chat-wrap{
  position: fixed;
  bottom: 90px;
  right: 20px;
  z-index: 2147483001;
  display:none;
}
#bk-chat-wrap.pos-left{ right:auto; left:20px; }
#bk-chat-wrap.open{ display:block; }

.bk-chat-window{
  width: 340px;
  max-width: calc(100vw - 40px);
  height: 520px;
  background: #ffffff;
  color: #111;
  border-radius: 14px;
  box-shadow: 0 16px 40px rgba(0,0,0,0.25);
  overflow: hidden;
  display:flex; flex-direction:column;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
}

.bk-chat-header{
  background:#000;
  color:#fff;
  padding:12px 14px;
  display:flex; align-items:center; justify-content:space-between;
}
.bk-chat-title{ font-weight:700; font-size:15px; }
.bk-chat-close{
  background: transparent; color:#fff; border:none; font-size:22px; cursor:pointer; line-height:1;
}

.bk-chat-body{
  flex:1; padding:12px; overflow:auto; background:#f8f9fb;
}
.msg{ padding:10px 12px; margin:8px 0; border-radius:10px; max-width: 92%; line-height:1.35; }
.msg.user{ background:#e6e9ef; margin-left:auto; }
.msg.assistant{ background:#ffffff; border:1px solid #eaeaea; }

.bk-chat-input{
  padding:10px; border-top:1px solid #eee; display:flex; gap:8px; align-items:flex-end; background:#fff;
}
#bk-chat-input{
  flex:1; resize:none; border:1px solid #ddd; border-radius:10px; padding:10px; line-height:1.35; max-height:140px;
}
#bk-chat-send{
  background:#000; color:#fff; border:none; padding:10px 14px; border-radius:10px; cursor:pointer; font-weight:600;
}

.bk-chat-footnote{
  font-size:11px; color:#666; padding:6px 10px; text-align:center; background:#fff;
}