:root{
  --bg:#0b0f14;
  --text:#e6edf3;
  --muted:#9fb0c0;
  --accent:#ff4fa3;
  --border: rgba(255,255,255,.08);
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial}
.top{
  padding:14px 18px;
  border-bottom:1px solid var(--border);
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
}
h1{margin:0;font-size:1.2rem}
.back{color:var(--muted);text-decoration:none}
.back:hover{color:var(--text)}
.hud{margin-left:auto;display:flex;gap:12px;color:var(--muted);flex-wrap:wrap}
.wrap{max-width:820px;margin:0 auto;padding:18px}
canvas{display:block;margin:0 auto;border:1px solid var(--border);border-radius:14px;background:#070a0f}
.help{text-align:center;color:var(--muted)}