body {
  background: linear-gradient(180deg, #0a1a33 0%, #00101f 100%);
  color: #e0f4ff;
  font-family: Arial, sans-serif;
}

header {
  background: #002b66;
  color: #ffffff;
  padding: 15px;
  font-size: 22px;
  border-bottom: 2px solid #0077ff;
  text-align: center;
}

.chat-box {
  background: rgba(0, 34, 68, 0.6);
  backdrop-filter: blur(4px);
  border: 1px solid #004080;
  border-radius: 10px;
  padding: 12px;
  height: 70vh;
  overflow-y: auto;
}

.msg.user {
  background: linear-gradient(90deg, #003b7a, rgba(0, 60, 120, 0.4));
  color: #bbddff;
  padding: 10px;
  margin: 8px 0;
  border-radius: 8px;
}

.msg.ai {
  background: linear-gradient(90deg, rgba(0, 136, 255, 0.3), rgba(0, 34, 68, 0.6));
  color: #e8f6ff;
  padding: 10px;
  margin: 8px 0;
  border-radius: 8px;
}

#input {
  border: 1px solid #0057b8;
  background: #001a33;
  color: #cce6ff;
  padding: 10px;
  border-radius: 8px;
}

button {
  background: #0077ff;
  color: white;
  border: none;
  padding: 10px 18px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
}

button:hover {
  background: #0095ff;
}