:root{font-family:system-ui,-apple-system,sans-serif;color-scheme:dark;background:#1a1a1a;color:#e8e8e8}*{box-sizing:border-box}body{margin:0;min-height:100vh;display:flex;align-items:flex-start;justify-content:center}.app{text-align:center;padding:2.5rem 1.5rem;width:100%;max-width:640px}.app h1{font-weight:400;letter-spacing:-.01em;margin:0 0 .5rem}.subtitle{margin:0 0 1.75rem;color:#9a9a9a;font-size:.9rem}.board-wrap{width:min(560px,90vw);margin:0 auto}