:root{color-scheme:dark;font-family:system-ui,-apple-system,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;min-height:100vh;display:grid;place-items:center;background:#0b0e14;color:#e2e8f0}.app{display:flex;flex-direction:column;gap:16px;align-items:center;padding:24px}.hud{display:flex;align-items:baseline;justify-content:space-between;gap:24px;width:100%}.hud h1{margin:0;font-size:20px;letter-spacing:.02em}.score{margin:0;font-size:14px;color:#94a3b8}.score span{font-variant-numeric:tabular-nums;font-size:18px;font-weight:600;color:#6ee7b7}.board{position:relative;line-height:0}canvas{border:1px solid #263042;border-radius:8px}.overlay{position:absolute;inset:0;display:grid;place-content:center;gap:8px;text-align:center;border-radius:8px;background:#0b0e14d1}.overlay[hidden]{display:none}.overlay-title{margin:0;font-size:24px;font-weight:700}.overlay-hint{margin:0;font-size:13px;color:#94a3b8}.help{margin:0;font-size:12px;color:#64748b}.help p{margin:0}