:root{color-scheme:dark;--bg: #07090d;--panel: #11161f;--ink: #e6edf3;--muted: #8b97a7}*{box-sizing:border-box}html,body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}.wrap{max-width:760px;margin:0 auto;padding:16px;display:flex;flex-direction:column;align-items:center}header{width:100%;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-bottom:12px}h1{margin:0;font-size:28px;letter-spacing:4px;background:linear-gradient(90deg,#ff5c5c,#5cb8ff,#9cff5c,#ffcf5c);-webkit-background-clip:text;background-clip:text;color:transparent}.controls{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.controls label{font-size:12px;color:var(--muted);display:flex;flex-direction:column;gap:2px}select,button{background:var(--panel);color:var(--ink);border:1px solid #2b3340;border-radius:6px;padding:6px 10px;font-size:14px;cursor:pointer}button#new{align-self:flex-end;background:#1f6feb;border-color:#1f6feb;font-weight:600}button#new:hover{background:#2d7dff}canvas{width:min(92vw,640px);height:min(92vw,640px);border-radius:10px;box-shadow:0 8px 30px #000a;touch-action:none;cursor:crosshair}.banner{margin-top:14px;padding:12px 22px;font-size:22px;font-weight:700;border-radius:10px;background:var(--panel);border:1px solid #2b3340}.banner.hidden{display:none}.hint{margin-top:12px;max-width:640px;text-align:center;font-size:13px;color:var(--muted);line-height:1.5}