:root{
  --bg0:#07111f; --bg1:#0b172a; --panel:rgba(12,22,38,.86); --line:rgba(148,163,184,.18);
  --text:#f8fafc; --muted:#94a3b8; --accent:#34d399; --good:#4ade80; --warn:#fbbf24; --bad:#fb7185;
  --snake:#4ade80; --snake2:#22c55e; --food:#fb7185; --ghost:#67e8f9; --double:#fbbf24; --slow:#a78bfa; --magnet:#38bdf8;
  --radius:16px; --shadow:0 18px 50px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%;color:var(--text);font-family:Inter,system-ui,sans-serif;
background:radial-gradient(circle at 12% 15%,rgba(52,211,153,.14),transparent 28%),radial-gradient(circle at 88% 10%,rgba(56,189,248,.12),transparent 24%),linear-gradient(165deg,#07111f,#0b172a 50%,#0a1220)}
body.snake-remake{overflow-x:hidden}
.app{min-height:100vh;display:flex;flex-direction:column}
.top{display:flex;justify-content:space-between;gap:10px;align-items:center;padding:12px 16px;border-bottom:1px solid var(--line);background:rgba(8,15,28,.8);backdrop-filter:blur(12px);position:sticky;top:0;z-index:20}
.brand{display:flex;gap:10px;align-items:center;font-weight:800}
.badge{width:36px;height:36px;border-radius:12px;display:grid;place-items:center;background:linear-gradient(135deg,#34d399,#38bdf8);color:#052e16}
.brand small{display:block;color:var(--muted);font-size:12px;font-weight:600}
.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.btn,.select{appearance:none;border:1px solid var(--line);background:rgba(255,255,255,.04);color:var(--text);border-radius:12px;min-height:40px;padding:8px 12px;font-weight:700;cursor:pointer}
.btn.primary{background:linear-gradient(135deg,#34d399,#10b981);color:#052e16;border:none}
.btn.active{border-color:rgba(52,211,153,.55);background:rgba(52,211,153,.14)}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn:focus-visible,.select:focus-visible{outline:2px solid #34d399;outline-offset:2px}
.main{width:min(1100px,100%);margin:0 auto;padding:16px;display:grid;gap:14px}
.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:12px}
.card span{display:block;color:var(--muted);font-size:12px;margin-bottom:4px}
.card strong{font-size:20px}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:14px;align-items:start}
.stage{display:flex;flex-direction:column;align-items:center;gap:12px}
.board-wrap{position:relative;width:min(100%,520px);aspect-ratio:1;border-radius:20px;overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow);background:linear-gradient(180deg,#0f1b2d,#0a1422)}
canvas#game{width:100%;height:100%;display:block;touch-action:none}
.danger-ring{position:absolute;inset:0;pointer-events:none;box-shadow:inset 0 0 0 0 rgba(251,113,133,0);transition:box-shadow .15s}
.danger-ring.on{box-shadow:inset 0 0 0 3px rgba(251,113,133,.55), inset 0 0 40px rgba(251,113,133,.12)}
.hud-line{width:min(100%,520px);display:flex;justify-content:space-between;gap:8px;color:var(--muted);font-size:14px;font-weight:700}
.tools{width:min(100%,520px);display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}
.dpad{width:min(100%,520px);display:none;grid-template-columns:repeat(3,72px);grid-template-rows:repeat(3,72px);gap:8px;justify-content:center}
.dpad .btn{min-height:72px;font-size:20px}
.dpad .up{grid-column:2;grid-row:1}
.dpad .left{grid-column:1;grid-row:2}
.dpad .down{grid-column:2;grid-row:2}
.dpad .right{grid-column:3;grid-row:2}
.status{width:min(100%,520px);color:var(--muted);min-height:20px;font-size:14px}
.side{display:grid;gap:12px}
.side h3{margin:0 0 8px;font-size:15px}
.side p,.side li{color:var(--muted);font-size:13px;line-height:1.5}
.side ul{margin:0;padding-left:18px}
.power{display:flex;gap:8px;flex-wrap:wrap}
.pill{padding:6px 10px;border-radius:999px;border:1px solid var(--line);font-size:12px;font-weight:800;color:var(--muted)}
.pill.on{color:var(--text);border-color:rgba(52,211,153,.4);background:rgba(52,211,153,.12)}
.ach{display:grid;gap:8px}
.ach-item{display:flex;gap:8px;padding:8px;border-radius:12px;border:1px solid var(--line);background:rgba(255,255,255,.03);color:var(--muted);font-size:12px}
.ach-item.on{color:var(--text);border-color:rgba(251,191,36,.35);background:rgba(251,191,36,.08)}
.overlay{position:fixed;inset:0;background:rgba(2,6,23,.62);display:none;place-items:center;z-index:40;padding:16px}
.overlay.show{display:grid}
.modal{width:min(440px,100%);background:rgba(10,18,32,.97);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:18px}
.modal h2{margin:0 0 8px}.modal p{color:var(--muted)}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:12px 0}
.grid2 div{background:rgba(255,255,255,.04);border-radius:12px;padding:10px}
.grid2 span{display:block;color:var(--muted);font-size:12px}
.toast{position:fixed;left:50%;bottom:16px;transform:translateX(-50%) translateY(16px);background:rgba(10,18,32,.95);border:1px solid rgba(52,211,153,.35);padding:10px 14px;border-radius:999px;opacity:0;transition:.2s;z-index:50;font-weight:700}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
@media(max-width:980px){.layout{grid-template-columns:1fr}.stats{grid-template-columns:repeat(2,minmax(0,1fr))}.dpad{display:grid}}
@media(max-width:640px){.top{padding:10px}.brand small{display:none}.tools{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (prefers-reduced-motion: reduce){.toast,.danger-ring{transition:none}}