* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: #f5efe8;
  color: #2b1d14;
}

.chat-app {
  max-width: 640px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: #fffaf5;
}

.chat-header {
  background: #4a2c17;
  color: #fff;
  padding: 16px 20px;
  text-align: center;
}

.chat-header h1 {
  margin: 0;
  font-size: 1.25rem;
}

.chat-header p {
  margin: 4px 0 0;
  font-size: 0.85rem;
  opacity: 0.85;
}

.config-banner {
  background: #fff3cd;
  color: #6b4e00;
  padding: 10px 16px;
  font-size: 0.85rem;
  border-bottom: 1px solid #f0d999;
}

.chat-log {
  flex: 1;
  padding: 16px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.message {
  max-width: 80%;
  padding: 10px 14px;
  border-radius: 14px;
  line-height: 1.4;
  font-size: 0.95rem;
  white-space: pre-wrap;
}

.message.assistant {
  align-self: flex-start;
  background: #eee1d3;
  border-bottom-left-radius: 4px;
}

.message.user {
  align-self: flex-end;
  background: #4a2c17;
  color: #fff;
  border-bottom-right-radius: 4px;
}

.message.error {
  align-self: flex-start;
  background: #fdecea;
  color: #7a1f16;
  border: 1px solid #f5c6c2;
}

.loading-indicator {
  padding: 0 16px 8px;
  font-size: 0.85rem;
  color: #7a5c44;
}

.chat-form {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  border-top: 1px solid #eaddd0;
  background: #fffaf5;
}

.chat-form input {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid #d8c6b4;
  border-radius: 8px;
  font-size: 1rem;
}

.chat-form button {
  padding: 10px 14px;
  border: none;
  border-radius: 8px;
  background: #4a2c17;
  color: #fff;
  font-size: 0.9rem;
  cursor: pointer;
}

.chat-form button#clear-button {
  background: #a9906f;
}

.chat-form button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

@media (max-width: 480px) {
  .chat-app {
    max-width: 100%;
  }
}