.chat-container {
  margin: 0 auto;
  background: white;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.08);
}
#chat-box {
  height: 400px;
  overflow-y: auto;
  padding: 10px;
  background: #f8f9fa;
  border-radius: 8px;
  border: 1px solid #ddd;
}
.message { margin: 10px 0; }
.message.user { text-align: right; }
.message.llm { text-align: left; }
.bubble {
  display: inline-block;
  padding: 10px;
  border-radius: 12px;
  max-width: 80%;
  word-wrap: break-word;
  font-size: 0.95em;
}
.message.user .bubble {
  background: #007bff;
  color: white;
}
.message.llm .bubble {
  background: #e9ecef;
  color: #333;
}
.input-group {
  display: flex;
  gap: 10px;
  margin-top: 10px;
  flex-wrap: wrap;
}
#user-input {
  flex: 1;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 8px;
  resize: vertical;
  min-height: 40px;
  max-height: 150px;
  font-size: 0.95em;
}
#send-btn, #file-label {
  background: #007bff;
  color: white;
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  cursor: pointer;
  font-size: 0.95em;
}
#send-btn:disabled {
  background: #aaa;
  cursor: not-allowed;
}
#file-label {
  background: #6c757d;
}
.quick-btn {
  margin: 5px 5px 0 0;
  padding: 6px 12px;
  border: none;
  background: #007bff;
  color: white;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85em;
}
.quick-btn:hover {
  background: #0056b3;
}
.loading-spinner {
  display: none;
  border: 4px solid #f3f3f3;
  border-top: 4px solid #007bff;
  border-radius: 50%;
  width: 24px;
  height: 24px;
  animation: spin 1s linear infinite;
  margin: 10px auto;
}
@keyframes spin { 100% { transform: rotate(360deg); } }

.think-block {
  border-left: 2px solid orange; 
  padding-left: 8px; 
  margin: 10px 0
}

.step-block {
  border-left: 4px solid green; 
  padding-left: 8px; 
  margin: 10px 0;
}