/* 簡単なローディングスピナーのCSS */
  .spinner {
    border: 4px solid rgba(0, 0, 0, 0.1);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border-left-color: #09f;
    animation: spin 1s ease infinite;
    display: inline-block;
    vertical-align: middle;
  }

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

.chat-container {
  display: flex;
  flex-direction: column;
  bottom: 0px;
  right: 0px;
  height: 50vh;  /* ビューポートの高さの50% */

  border: 1px solid #ccc;
  border-radius: 8px;
  font-family: Arial, sans-serif;
  background-color: #f9f9f9;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);

  transition: transform 0.3s ease-out, opacity 0.3s ease-out; /* アニメーションを追加 */
  position: relative;
}


.btn {
  display: inline-block;
  padding: 16px 32px;
  font-size: 1.5rem;
  font-weight: bold;
  border: none;
  border-radius: 8px;
  text-decoration: none;
  color: white;
  text-align: center;
  transition: background-color 0.3s ease;
}
.btn-primary {
  background-color: #007bff;
}
.btn-primary:hover {
  background-color: #0056b3;
}
.btn-secondary {
  background-color: #6c757d;
}
.btn-secondary:hover {
  background-color: #5a6268;
}
.center-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 40px;
}