:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100vh;background:#000;color:#fafafa;overflow:hidden}.app{display:flex;flex-direction:column;align-items:center;min-height:100vh;padding-top:1rem}h1{margin:0 0 .5rem;font-size:1.5rem;font-weight:600;letter-spacing:-.02em}.distance{margin-bottom:.5rem;font-size:1.1rem}canvas{background:#111;border:2px solid #333;display:block;cursor:pointer}.overlay{position:absolute;top:0;left:0;width:100%;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;background:#000000b3;z-index:10}.overlay h2{font-size:2rem;margin-bottom:1rem}.overlay p{font-size:1.1rem;color:#ffffffa6;margin-bottom:1.5rem}.overlay button{padding:.75rem 2rem;font-size:1rem;border:none;border-radius:.5rem;background:#ffc107;color:#000;font-weight:600;cursor:pointer}.overlay button:hover{background:#ffd54f}