:root {
  --color-primary: #0b3d91;
  --color-primary-dark: #084177;
  --color-bg: #f5f5f5;
  --color-text-light: #eee;
  --color-text-dark: #333;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--color-bg);
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
}

header {
  background-color: var(--color-primary);
  color: white;
  padding: 1rem;
  text-align: center;
}

main {
  flex-grow: 1;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

#chat-box {
  flex-grow: 1;
  overflow-y: auto;
  margin-bottom: 1rem;
  border: 1px solid #ddd;
  background-color: white;
  padding: 1rem;
  border-radius: 6px;
}

.message {
  margin-bottom: 1rem;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  max-width: 70%;
  word-wrap: break-word;
}

.message.user {
  background-color: var(--color-primary);
  color: white;
  align-self: flex-end;
}

.message.bot {
  background-color: #e0e0e0;
  color: var(--color-text-dark);
  align-self: flex-start;
}

form {
  display: flex;
  gap: 0.5rem;
}

input[type="text"] {
  flex-grow: 1;
  padding: 0.5rem 1rem;
  border: 1px solid #ddd;
  border-radius: 20px;
  font-size: 1rem;
}

button {
  padding: 0 1rem;
  border: none;
  border-radius: 20px;
  background-color: var(--color-primary);
  color: white;
  font-size: 1rem;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: var(--color-primary-dark);
}