.ai-study-assistant{
  position:fixed;
  right:18px;
  bottom:95px;
  z-index:99999;
  font-family:Inter,Arial,sans-serif;
}
.ai-study-trigger{
  display:flex;
  align-items:flex-end;
  gap:10px;
  background:transparent;
  border:0;
  cursor:pointer;
  padding:0;
}
.ai-study-trigger-bubble{
  max-width:220px;
  background:#ffffff;
  color:#1f2937;
  padding:12px 14px;
  border-radius:16px;
  box-shadow:0 10px 30px rgba(0,0,0,.12);
  font-size:14px;
  line-height:1.35;
}
.ai-study-avatar{
  width:76px;
  height:76px;
  object-fit:contain;
  border-radius:50%;
  box-shadow:0 10px 30px rgba(0,0,0,.15);
  background:#fff;
}
.ai-study-avatar-small{
  width:42px;
  height:42px;
  box-shadow:none;
  border-radius:50%;
}
.ai-study-panel{
  position:absolute;
  right:0;
  bottom:96px;
  width:min(380px, calc(100vw - 24px));
  background:#fff;
  border-radius:18px;
  box-shadow:0 18px 50px rgba(0,0,0,.18);
  overflow:hidden;
  border:1px solid #e5e7eb;
}
.ai-study-header{
  display:flex;
  justify-content:space-between;
  gap:12px;
  align-items:center;
  padding:14px 14px 12px;
  border-bottom:1px solid #eef2f7;
}
.ai-study-header-left{display:flex;align-items:center;gap:10px;}
.ai-study-subtitle{font-size:12px;color:#6b7280;margin-top:2px;}
.ai-study-close{
  border:0;background:#f3f4f6;color:#111827;
  width:34px;height:34px;border-radius:999px;cursor:pointer;font-size:22px;line-height:1;
}
.ai-study-messages{
  max-height:320px;
  overflow:auto;
  padding:14px;
  background:#f8fafc;
}
.ai-study-msg{
  margin-bottom:10px;
  font-size:14px;
  line-height:1.45;
  padding:11px 13px;
  border-radius:14px;
}
.ai-study-msg-user{
  background:#4267D6;
  color:#fff;
  margin-left:30px;
}
.ai-study-msg-bot{
  background:#fff;
  color:#111827;
  border:1px solid #e5e7eb;
  margin-right:30px;
}
.ai-study-quick-questions{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  padding:12px 14px 0;
}
.ai-study-quick-questions button{
  border:1px solid #dbe4ff;
  background:#f5f8ff;
  color:#2948b8;
  border-radius:999px;
  padding:8px 10px;
  font-size:12px;
  cursor:pointer;
}
.ai-study-form{
  display:flex;
  gap:10px;
  padding:14px;
}
.ai-study-form textarea{
  flex:1;
  resize:none;
  border:1px solid #d1d5db;
  border-radius:12px;
  padding:10px 12px;
  font:inherit;
}
.ai-study-form button{
  align-self:flex-end;
  border:0;
  background:#4267D6;
  color:#fff;
  border-radius:12px;
  padding:10px 14px;
  cursor:pointer;
  font-weight:600;
}
.ai-study-form button:disabled{opacity:.7;cursor:wait;}
@media (max-width: 640px){
  .ai-study-assistant{right:12px;bottom:88px;}
  .ai-study-trigger-bubble{max-width:170px;font-size:13px;}
  .ai-study-avatar{width:68px;height:68px;}
  .ai-study-panel{width:min(360px, calc(100vw - 12px));right:0;bottom:86px;}
}