body {
  background: #f2f3f5;
  font-family: 'Segoe UI', Arial, sans-serif;
  margin: 0;
}

#app {
  max-width: 480px;
  margin: 0 auto;
  background: #fff;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.chat-container {
  flex: 1;
  padding: 16px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.message {
  margin-bottom: 10px;
  padding: 8px 12px;
  border-radius: 12px;
  max-width: 80%;
}

.message.user {
  background: #e1ffc7;
  align-self: flex-end;
}

.message.assistant {
  background: #f0f0f0;
  align-self: flex-start;
}

.message img, .message video, .message audio {
  max-width: 100%;
  display: block;
  margin-top: 6px;
}

#chat-form {
  display: flex;
  padding: 8px;
  border-top: 1px solid #eaeaea;
  background: #fafbfc;
}

#text-input {
  flex: 1;
  padding: 8px;
  border: 1px solid #d5d7db;
  border-radius: 8px;
  margin-right: 8px;
}

#send-btn, #attach-btn {
  padding: 8px 10px;
  border: none;
  background: #4a76a8;
  color: #fff;
  border-radius: 8px;
  cursor: pointer;
  margin-left: 4px;
  font-size: 16px;
}

#attach-btn {
  background: #e5e5e5;
  color: #4a76a8;
}