* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: system-ui, sans-serif; background: linear-gradient(to bottom, #f0f7ff, #e3f2fd); min-height: 100vh; display: grid; place-items: center; }
.container { background: white; padding: 2rem; border-radius: 20px; box-shadow: 0 20px 40px rgba(0,0,0,0.1); max-width: 600px; width: 90%; }
h1 { font-size: 2.5rem; text-align: center; margin-bottom: 0.5rem; }
h1 span { color: #4a90e2; }
p { text-align: center; color: #666; margin-bottom: 2rem; }
#chat { border: 1px solid #ddd; border-radius: 12px; height: 60vh; display: flex; flex-direction: column; }
#messages { flex: 1; padding: 1rem; overflow-y: auto; }
.message { margin: 0.5rem 0; padding: 0.8rem 1.2rem; border-radius: 18px; max-width: 80%; }
.user { background: #4a90e2; color: white; align-self: flex-end; margin-left: auto; }
.bot { background: #f0f0f0; align-self: flex-start; }
.input-area { display: flex; padding: 1rem; border-top: 1px solid #ddd; }
#userInput { flex: 1; padding: 0.8rem; border: 1px solid #ccc; border-radius: 25px; font-size: 1rem; }
button { margin-left: 0.5rem; padding: 0.8rem 1.5rem; background: #4a90e2; color: white; border: none; border-radius: 25px; cursor: pointer; }