:root { --primary: #0056b3; --bg: #f0f2f5; }
body { font-family: sans-serif; background: var(--bg); display: flex; justify-content: center; align-items: center; height: 100vh; margin: 0; }
#chat-container { width: 400px; height: 500px; background: white; border-radius: 10px; box-shadow: 0 5px 15px rgba(0,0,0,0.2); display: flex; flex-direction: column; overflow: hidden; }
header { background: var(--primary); color: white; padding: 15px; text-align: center; font-weight: bold; }
#chat-window { flex: 1; padding: 15px; overflow-y: auto; display: flex; flex-direction: column; gap: 10px; }
.message { max-width: 80%; padding: 10px; border-radius: 10px; font-size: 14px; }
.user { align-self: flex-end; background: var(--primary); color: white; }
.bot { align-self: flex-start; background: #e9ecef; color: #333; }
.input-area { padding: 10px; display: flex; gap: 5px; border-top: 1px solid #ddd; }
input { flex: 1; padding: 8px; border-radius: 5px; border: 1px solid #ccc; }
button { background: var(--primary); color: white; border: none; padding: 10px; border-radius: 5px; cursor: pointer; }