:root { color-scheme: dark; font-family: 'Segoe UI', sans-serif; background: #070b15; color: #e3f7ff; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: radial-gradient(ellipse at 50% 35%, #102334 0, #070b15 70%); }
main { width: min(100% - 32px, 520px); margin: 0 auto; padding: 28px 0; text-align: center; }
.eyebrow { color: #8a9bac; font-size: 11px; letter-spacing: .35em; margin: 0 0 7px; }
h1 { font-size: clamp(30px, 8vw, 46px); letter-spacing: .08em; margin: 0 0 24px; color: #60ffdc; text-shadow: 0 0 24px #24d5bb77; }
h1 span { color: #f56cdd; text-shadow: 0 0 24px #f56cdd66; }
.scores { display: flex; justify-content: space-between; padding: 0 10px 18px; color: #93a5b9; font-size: 11px; letter-spacing: .16em; }
strong { display: block; color: #e3f7ff; font-size: 27px; margin-top: 5px; font-variant-numeric: tabular-nums; }
.board { position: relative; border: 1px solid #45dcca80; box-shadow: 0 0 24px #24d5bb18; background: #080f1b; }
canvas { display: block; width: 100%; height: auto; }
#overlay { position: absolute; inset: 0; display: flex; flex-direction: column; justify-content: center; background: #070b15c9; }
#overlay[hidden] { display: none; }
h2 { font-size: 32px; color: #60ffdc; margin: 0 0 6px; }
#detail { color: #b3c7da; margin: 0; }
#status { color: #91b6c7; min-height: 20px; font-size: 13px; margin: 16px 0; }
nav { display: flex; gap: 10px; }
button { flex: 1; padding: 12px 8px; background: #10232d; border: 1px solid #39776f; border-radius: 4px; color: #8bffe7; font: inherit; cursor: pointer; }
button:hover:enabled { background: #193c41; }
button:disabled { opacity: .35; cursor: default; }
button:focus-visible { outline: 3px solid #f56cdd; outline-offset: 4px; }
.help { color: #8495aa; font-size: 12px; line-height: 1.9; margin: 19px 0 0; }