body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background-color: #f5f7fa;
  color: #333;
}

header {
  background-color: #00796b;
  padding: 1em 2em;
  color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav a {
  color: white;
  margin: 0 1em;
  text-decoration: none;
  font-weight: bold;
}

nav a:hover {
  text-decoration: underline;
}

.container {
  max-width: 900px;
  margin: 2em auto;
  padding: 1em;
  background: white;
  border-radius: 8px;
  box-shadow: 0 0 15px rgba(0,0,0,0.1);
}

#chat-container {
  border: 1px solid #ccc;
  border-radius: 5px;
  padding: 1em;
  margin-bottom: 2em;
}

#chat {
  height: 300px;
  overflow-y: auto;
  border: 1px solid #ddd;
  padding: 1em;
  background: #f0f0f0;
  margin-bottom: 1em;
}

input[type="text"] {
  width: 100%;
  padding: 0.7em;
  font-size: 1em;
}

.message {
  margin-bottom: 1em;
}

.user {
  color: #00796b;
  font-weight: bold;
}

.bot {
  color: #555;
  font-weight: bold;
}

h2 {
  margin-top: 2em;
  border-bottom: 2px solid #ccc;
  padding-bottom: 0.3em;
}

ul {
  padding-left: 1.2em;
}

footer {
  text-align: center;
  font-size: 0.9em;
  color: #888;
  padding: 2em;
}