body { font-family: Arial, sans-serif; background: #f4f5f7; margin: 0; }
.container { max-width: 980px; margin: 2rem auto; padding: 1rem; background: white; border-radius: 8px; }
label { display: block; margin-bottom: 1rem; }
input, textarea, button { width: 100%; padding: .6rem; margin-top: .2rem; }
button { cursor: pointer; }
.buttons { display: grid; grid-template-columns: repeat(3, 1fr); gap: .5rem; margin-bottom: 1rem; }
.error { color: #b30000; }
.chat-layout { display: grid; grid-template-columns: 220px 1fr; gap: 1rem; }
.messages { min-height: 300px; max-height: 450px; overflow: auto; border: 1px solid #ddd; padding: .8rem; margin-bottom: 1rem; }
.active { font-weight: bold; }
.chat-header { display: flex; justify-content: space-between; align-items: center; }