.chat-interface {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  background: #ffffff;
}

.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: #666;
  text-align: center;
}

.empty-state h2 {
  margin: 0 0 8px 0;
  font-size: 24px;
  color: #333;
}

.empty-state p {
  margin: 0;
  font-size: 16px;
}

.message-group {
  margin-bottom: 32px;
}

.user-message,
.assistant-message {
  margin-bottom: 16px;
}

.message-label {
  font-size: 12px;
  font-weight: 600;
  color: #666;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.user-message .message-content {
  background: #f0f7ff;
  padding: 16px;
  border-radius: 8px;
  border: 1px solid #d0e7ff;
  color: #333;
  line-height: 1.6;
  max-width: 80%;
  white-space: pre-wrap;
}

.loading-indicator {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  color: #666;
  font-size: 14px;
}

.stage-loading {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  margin: 12px 0;
  background: #f9fafb;
  border-radius: 8px;
  border: 1px solid #e0e0e0;
  color: #666;
  font-size: 14px;
  font-style: italic;
}

.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid #e0e0e0;
  border-top-color: #4a90e2;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.input-form {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  padding: 24px;
  border-top: 1px solid #e0e0e0;
  background: #fafafa;
}

.message-input {
  flex: 1;
  padding: 14px;
  background: #ffffff;
  border: 1px solid #d0d0d0;
  border-radius: 8px;
  color: #333;
  font-size: 15px;
  font-family: inherit;
  line-height: 1.5;
  outline: none;
  resize: vertical;
  min-height: 80px;
  max-height: 300px;
}

.message-input:focus {
  border-color: #4a90e2;
  box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.message-input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background: #f5f5f5;
}

.send-button {
  padding: 14px 28px;
  background: #4a90e2;
  border: 1px solid #4a90e2;
  border-radius: 8px;
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  white-space: nowrap;
  align-self: flex-end;
}

.send-button:hover:not(:disabled) {
  background: #357abd;
  border-color: #357abd;
}

.send-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background: #ccc;
  border-color: #ccc;
}