/* ===== layout ===== */
.stage{position:relative;background:var(--panel);backdrop-filter:blur(14px);
  border:1px solid var(--border);border-radius:var(--radius);padding:12px;
  box-shadow:0 24px 60px rgba(0,0,0,.45)}
.board-wrap{position:relative;border-radius:14px;overflow:hidden;
  background:linear-gradient(160deg,#0a1120,#070c16);border:1px solid rgba(255,255,255,.06)}
canvas{display:block;width:100%;height:auto;touch-action:none}
/* ===== overlays ===== */
.overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:12px;text-align:center;padding:20px;
  background:rgba(5,9,17,.82);backdrop-filter:blur(6px);transition:.28s;z-index:3}
.overlay.hide{opacity:0;pointer-events:none}
.overlay h2{font-size:clamp(1.2rem,5vw,1.6rem);font-weight:900}
.overlay p{color:var(--muted);font-size:.85rem;line-height:1.7;max-width:22rem}
.btn{border:none;cursor:pointer;font-family:inherit;font-weight:800;font-size:.95rem;
  padding:13px 30px;border-radius:14px;color:#04140f;
  background:linear-gradient(135deg,var(--accent),#59f0c2);
  box-shadow:0 10px 26px rgba(46,230,168,.3);transition:.22s}
.btn:hover{transform:translateY(-2px);box-shadow:0 16px 34px rgba(46,230,168,.4)}
.btn:active{transform:translateY(0) scale(.98)}
.btn.ghost{background:transparent;color:var(--text);border:1px solid var(--border);box-shadow:none;padding:11px 22px}
.btn.ghost:hover{border-color:rgba(46,230,168,.5);box-shadow:none}
.levels{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}
.lvl{background:transparent;border:1px solid var(--border);color:var(--muted);font-family:inherit;
  font-weight:700;font-size:.8rem;padding:8px 16px;border-radius:999px;cursor:pointer;transition:.2s}
.lvl:hover{color:var(--text);border-color:rgba(255,255,255,.25)}
.lvl.on{background:rgba(46,230,168,.14);border-color:var(--accent);color:var(--accent)}
/* ===== hud / controls ===== */
.hud{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:12px}
.hint{font-size:.72rem;color:var(--muted);font-weight:600;line-height:1.6}
kbd{background:rgba(255,255,255,.08);border:1px solid var(--border);border-bottom-width:2px;
  border-radius:6px;padding:1px 6px;font-size:.7rem;font-family:inherit}
/* ===== touch d-pad ===== */
.pad{display:none;grid-template-columns:repeat(3,64px);grid-template-rows:repeat(3,58px);
  gap:8px;justify-content:center;margin-top:14px}
.pad button{background:var(--panel);border:1px solid var(--border);color:var(--text);
  border-radius:14px;font-size:20px;cursor:pointer;transition:.15s;backdrop-filter:blur(10px)}
.pad button:active{background:rgba(46,230,168,.18);border-color:var(--accent);transform:scale(.95)}
.pad .up{grid-area:1/2} .pad .left{grid-area:2/1} .pad .right{grid-area:2/3} .pad .down{grid-area:3/2}
.pad .mid{grid-area:2/2;background:transparent;border:1px dashed var(--border);color:var(--muted);font-size:16px}
/* ===== toast ===== */
.toast{position:fixed;bottom:22px;left:50%;transform:translate(-50%,140%);z-index:20;
  background:rgba(10,18,32,.95);border:1px solid var(--accent);color:var(--text);
  padding:11px 20px;border-radius:12px;font-size:.85rem;font-weight:700;transition:.35s;
  box-shadow:0 14px 40px rgba(0,0,0,.5)}
.toast.show{transform:translate(-50%,0)}
.foot{text-align:center;margin-top:14px;font-size:.7rem;color:var(--muted)}
@media (max-width:640px){.pad{display:grid}.hint.desk{display:none}}
@media (min-width:641px){.pad{display:none}}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}