:root{color-scheme:dark;--bg: #0a1422;--fg: #e8f1ff;--accent: #5cf2ff}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--fg);font-family:system-ui,-apple-system,Segoe UI,sans-serif;-webkit-font-smoothing:antialiased}#app{display:flex;justify-content:center}.wrap{display:flex;flex-direction:column;align-items:center;padding:16px 12px 32px;max-width:560px;width:100%}h1{margin:4px 0 2px;font-size:26px;letter-spacing:2px;color:var(--accent);text-shadow:0 0 12px rgba(92,242,255,.4)}.sub{margin:0 0 12px;font-size:13px;opacity:.75;text-align:center}canvas#screen{border:2px solid #244;border-radius:8px;background:#10243a;box-shadow:0 8px 30px #00000080;max-width:100%;height:auto;touch-action:none}.diffrow{display:flex;gap:16px;align-items:center;margin-top:14px;font-size:14px}select,button{font:inherit;background:#16304a;color:var(--fg);border:1px solid #2c5878;border-radius:6px;padding:6px 12px;cursor:pointer}button:hover{background:#1d3f60}