body {
  font-family: 'Segoe UI', sans-serif;
  background: #111;
  color: #eee;
  display: flex;
  justify-content: center;
  padding: 2rem;
  min-height: 100vh;
}
#chat-container {
  width: 100%;
  max-width: 600px;
  background: #1e1e1e;
  border-radius: 12px;
  padding: 1rem;
  box-shadow: 0 0 15px rgba(0, 255, 128, 0.3);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
#messages {
  height: 300px;
  overflow-y: auto;
  background: #000;
  padding: 0.5rem;
  border-radius: 6px;
  font-size: 0.95rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  border: 1px solid #333;
}
#messages div {
  background: #222;
  padding: 0.5rem;
  border-radius: 6px;
}
input {
  width: 100%;
  padding: 0.6rem;
  background: #2c2c2c;
  color: #fff;
  border: 1px solid #444;
  border-radius: 6px;
  font-size: 1rem;
}
button {
  padding: 0.6rem;
  background: #00ff99;
  color: #000;
  border: none;
  border-radius: 6px;
  font-weight: bold;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s;
}
button:hover {
  background: #00cc7a;
}