:root{
  --bg:#0b0f1e;
  --panel:#0f142b;
  --panel-2:#12183a;
  --brand:#8fd3ff;
  --accent:#a78bfa;
  --ok:#aef0c0;
  --grid:#2e3563;
  --tile:#141c3b;
  --tile-block:#2a1831;
  --tile-start:#123527;
  --tile-goal:#3a1a1a;
  --tile-key:#224a38;
  --tile-gate:#3c2444;
  --tile-pulse:#1a2350;
  --tile-color:#24385e;
  --text:#e6e9ff;
  --muted:#9aa3c7;
  --glow:0 0 18px rgba(143,211,255,.35);
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;background:
  radial-gradient(1200px 800px at 10% 0%,rgba(69,44,124,.18),transparent),
  radial-gradient(900px 700px at 100% 0%,rgba(84,140,255,.12),transparent),
  var(--bg);color:var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;}
.topbar{position:sticky;top:0;z-index:5;display:flex;justify-content:space-between;align-items:center;padding:10px 14px;background:linear-gradient(180deg, rgba(8,12,28,.85), rgba(8,12,28,.65));backdrop-filter: blur(8px);border-bottom:1px solid #1f2550}
.brand{display:flex;align-items:center;gap:8px;font-weight:800;letter-spacing:.4px}
.logo-dot{width:12px;height:12px;border-radius:999px;background:var(--brand);box-shadow:var(--glow)}
.logo-text{font-weight:800}
.logo-thin{opacity:.7;margin-left:4px}
.controls{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.pill{padding:6px 10px;border-radius:999px;border:1px solid #273065;background:#0f1430;font-size:12px;color:#9aa3c7}
.btn{background:#1a2050;border:1px solid #2a3380;border-radius:12px;padding:8px 12px;color:#fff;cursor:pointer;box-shadow: var(--glow);transition: transform .08s ease, filter .1s ease}
.btn:hover{filter:brightness(1.08)}
.btn:active{transform: translateY(1px)}
.btn.ghost{background:transparent;border-color:#2a3380}
.wrap{display:flex;flex-direction:column;align-items:center;padding:18px;gap:10px}
.canvas-shell{position:relative;display:flex;justify-content:center;width:100%}
#game{background:linear-gradient(180deg,var(--panel),var(--panel-2));border:1px solid #1f2550;border-radius:16px;max-width:100%;height:auto;box-shadow:0 10px 40px rgba(0,0,0,.35), inset 0 0 18px rgba(135,160,255,.08)}
.toast{position:absolute;bottom:12px;left:50%;transform:translateX(-50%);background:rgba(16,22,51,.85);border:1px solid #243065;border-radius:12px;padding:8px 12px;color:var(--ok);opacity:0;pointer-events:none;transition:opacity .2s ease}
.status{min-height:22px;font-size:14px;color:var(--ok)}
.foot{padding:12px;text-align:center;color:#9aa3c7;font-size:12px;border-top:1px solid #1f2550;background:rgba(8,12,28,.4)}
.modal{border:none;padding:0;background:transparent}
.modal::backdrop{background:rgba(7,10,22,.45);backdrop-filter: blur(3px)}
.modal-card{min-width: min(560px, 92vw); background: #0f1430; border:1px solid #232a5c; border-radius:16px; padding:16px; box-shadow:0 20px 60px rgba(0,0,0,.45)}
.modal h2{margin:0 0 8px}
.steps{margin:0 0 10px 18px}
.small{font-size:12px}
.switch{display:flex;align-items:center;gap:10px}
.switch input{transform: scale(1.2)}
.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:10px}
.legend{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0}
.badge{padding:4px 8px;border-radius:999px;border:1px solid #2a3380;background:#10163b;font-size:12px;color:#cfd6ff}
.badge.start{border-color:#2e6a50}
.badge.goal{border-color:#803d3d}
.badge.block{border-color:#5b2a4a}
.badge.key{border-color:#2e6a50}
.badge.gate{border-color:#51306b}
.badge.pulse{border-color:#2a3a9a}
.badge.color{border-color:#2f4e9a}
.level-grid{display:grid;grid-template-columns: repeat(auto-fill, minmax(140px,1fr));gap:10px;margin-top:8px}
.level-card{display:flex;flex-direction:column;gap:6px;border:1px solid #232a5c;border-radius:14px;background:#0e1330;padding:10px;cursor:pointer}
.level-card:hover{filter:brightness(1.04)}
.level-title{font-size:14px}
.level-diff{font-size:12px;color:#9aa3c7}