* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
}

body,
button,
textarea {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

body {
  background: #f5f5f4;
  color: #111111;
}

.chat {
  width: min(100% - 32px, 760px);
  height: 100vh;
  margin: 0 auto;
  padding: 20px 0;
  display: flex;
  flex-direction: column;
}

.header {
  flex: 0 0 auto;
  text-align: center;
  padding-bottom: 16px;
}

.logo {
  display: block;
  width: 180px;
  height: auto;
  margin: 0;
}

.messages {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding: 8px 2px 20px;
}

.message {
  width: fit-content;
  max-width: 82%;
  margin: 0 0 12px;
  padding: 12px 16px;
  border: 1px solid #c9c9c9;
  border-radius: 16px;
  background: #ffffff;
  color: #111111;
  font-size: 16px;
  line-height: 1.5;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.message.user {
  margin-left: auto;
  background: #e8e8e8;
}

.message.assistant {
  margin-right: auto;
}

.message.error {
  max-width: 100%;
  margin-right: auto;
  margin-left: auto;
  border-color: #b3261e;
  background: #fff1f0;
  color: #8c1d18;
}

.composer {
  flex: 0 0 auto;
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding-top: 12px;
}

#message-input {
  display: block;
  flex: 1 1 auto;
  width: 100%;
  min-width: 0;
  height: 108px;
  margin: 0;
  padding: 12px 14px;
  resize: none;
  overflow-y: auto;
  border: 2px solid #9bb8ff;
  border-radius: 16px;
  outline: none;
  background: #ffffff;
  color: #111111;
  font-size: 16px;
  line-height: 1.4;
}

#message-input:focus {
  border-color: #628cff;
}

#message-input::placeholder {
  color: #999999;
}

.composer button {
  flex: 0 0 auto;
  height: 46px;
  padding: 0 20px;
  border: 0;
  border-radius: 13px;
  background: #171717;
  color: #ffffff;
  font-weight: 600;
  cursor: pointer;
}

.composer button:disabled,
#message-input:disabled {
  opacity: 0.55;
  cursor: default;
}

@media (max-width: 560px) {
  .chat {
    width: calc(100% - 20px);
    padding: 12px 0;
  }

  .logo {
    width: 150px;
  }

  .composer {
    display: grid;
    grid-template-columns: 1fr;
  }

  .composer button {
    width: 100%;
  }
}