Claude Sonnet 4

Three-tier pricing with a glowing border on the featured plan. Hover lifts cards with smooth spring animation. Dark theme with amber accents.

Complete chat UI with message bubbles, typing indicator, and input bar. Supports user and assistant messages with different visual treatments.

Expandable prompt input with file attachment, model selector dropdown, character counter, and Cmd+Enter submit hint. Dark, polished, production-ready.