Now let me build the calculator. I'll create a sleek dark-themed calculator with a warm accent color, clean typography, and satisfying button interactions.

Your calculator is ready! It features a dark theme with warm orange accent buttons for operators, a monospace display with dynamic font sizing, full keyboard support (numbers, operators, Enter/Escape/Backspace), and satisfying press animations. The display also shows the running expression above the result and formats large numbers with commas.