body {
  display: flex;
  justify-content: center;    /* horizontal centering */
  align-items: center;        /* vertical centering */
  height: 100vh;              /* full viewport height */
  margin: 0;
  background: #f4f4f4;
  font-family: Arial, sans-serif;
  flex-direction: column;     /* optional if you want column layout */
  /* remove padding-top and duplicate align-items */
}


#error-message, #login-error {
  color: red;
  margin-top: 8px;
}

.login-container {
  width: 300px;
  padding: 20px;
  background: white;
  border: 1px solid #ccc;
  margin-bottom: 30px;
  border-radius: 8px;
  box-shadow: 0 0 8px rgba(0,0,0,0.1);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.login-container input {
  margin: 8px 0;
  padding: 10px;
  font-size: 16px;
  border: 1px solid #ccc;
  border-radius: 4px;
}

.login-container button {
  padding: 10px;
  border: none;
  background-color: #2196f3;
  color: white;
  cursor: pointer;
  font-size: 16px;
  border-radius: 4px;
}

.login-container button:hover {
  background-color: #1976d2;
}

.chat-container {
  width: 800px;
  max-height: 1000px;
  border: 1px solid #ccc;
  background: #fff;
  display: flex;
  flex-direction: column;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.chat-messages {
  flex: 1;
  padding: 10px;
  overflow-y: auto;
}

.message {
  padding: 8px 12px;
  margin: 6px 0;
  border-radius: 12px;
  max-width: 80%;
  word-wrap: break-word;
}

.user {
  align-self: flex-end;
  background-color: #daf1ff;
}

.bot {
  align-self: flex-start;
  background-color: #e4e4e4;
}

.chat-input {
  display: flex;
  border-top: 1px solid #ccc;
}

.chat-input input {
  flex: 1;
  padding: 10px;
  border: none;
  outline: none;
  font-size: 16px;
}

.chat-input button {
  padding: 10px;
  border: none;
  background-color: #2196f3;
  color: white;
  cursor: pointer;
  font-size: 16px;
}

.chat-input button:hover {
  background-color: #1976d2;
}

.message.bot ul {
  padding-left: 18px;
  list-style-type: disc;
}

.message.bot strong {
  color: #333;
}

.message.loading::after {
  content: '';
  display: inline-block;
  margin-left: 6px;
  width: 1em;
  height: 1em;
  vertical-align: middle;
  border-radius: 50%;
  background-color: #999;
  animation: blink 1s infinite;
}

@keyframes blink {
  0% { opacity: 0.2; }
  50% { opacity: 1; }
  100% { opacity: 0.2; }
}