body {
  font-family: sans-serif;
  background-color: #f0f0f0;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

#root {
  width: 100%;
  max-width: 600px;
  height: 90vh;
  display: flex;
  flex-direction: column;
  background-color: #fff;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  border-radius: 8px;
  overflow: hidden;
}

.chat-window {
  flex-grow: 1;
  overflow-y: auto;
  padding: 15px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.message {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.message img {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  object-fit: cover;
}

.message-content {
  background-color: #e9e9eb;
  padding: 8px 12px;
  border-radius: 15px;
  max-width: 80%;
  word-wrap: break-word;
}

.username {
  font-weight: bold;
  margin-bottom: 2px;
  font-size: 0.85em;
  color: #555;
}

.input-area {
  padding: 15px;
  border-top: 1px solid #eee;
  display: flex;
  gap: 10px;
}

.input-area input {
  flex-grow: 1;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 20px;
  outline: none;
}

.input-area button {
  padding: 10px 20px;
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 20px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.input-area button:hover {
  background-color: #0056b3;
}

.loading-spinner {
    border: 4px solid #f3f3f3; /* Light grey */
    border-top: 4px solid #3498db; /* Blue */
    border-radius: 50%;
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}