:root {
  --bg:#070a14;
  --bg2:#0d1426;
  --panel:rgba(10,14,28,.9);
  --panel-2:rgba(14,19,36,.95);
  --line:rgba(128,176,255,.16);
  --line-strong:rgba(128,238,255,.32);
  --text:#eef4ff;
  --muted:#9bb0d5;
  --cyan:#74f0ff;
  --purple:#bc79ff;
  --gold:#ffd36f;
  --safe-top:env(safe-area-inset-top,0px);
  --safe-bottom:env(safe-area-inset-bottom,0px);
  --pad:clamp(12px,3.4vw,20px);
  --radius:20px;
  --font:Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;width:100%;height:100%;background:var(--bg);color:var(--text);font-family:var(--font);overscroll-behavior:none}
body{overflow:hidden}
button,input{font:inherit;color:inherit}
button{border:0;background:none;padding:0;appearance:none}
.app{position:relative;width:100%;height:100%;overflow:hidden;background:radial-gradient(circle at 50% -10%, #1d2b59 0%, #0a1020 34%, #060911 100%)}
.backdrop,.backdrop>*{position:absolute;inset:0;pointer-events:none}
.backdrop .grid{inset:auto -20% -10%;height:62%;opacity:.25;background:
  linear-gradient(transparent 0 95%, rgba(116,240,255,.13) 95% 100%),
  linear-gradient(90deg, transparent 0 95%, rgba(188,121,255,.1) 95% 100%);
  background-size:100% 24px,24px 100%;transform:perspective(560px) rotateX(74deg)}
.glow{filter:blur(48px);opacity:.45}
.glow-a{background:radial-gradient(circle at 30% 20%, rgba(116,240,255,.35), transparent 32%)}
.glow-b{background:radial-gradient(circle at 70% 15%, rgba(188,121,255,.28), transparent 30%)}

.screen{position:absolute;inset:0;display:none}
.screen.active{display:grid}

#homeScreen{place-items:center;padding:calc(var(--safe-top) + 24px) 20px calc(var(--safe-bottom) + 24px)}
.home-shell{width:min(100%,420px);display:grid;gap:28px;justify-items:center}
.logo-wrap{display:grid;justify-items:center;gap:8px;text-align:center}
.logo-mark{width:min(60vw,220px);height:auto;filter:drop-shadow(0 0 18px rgba(116,240,255,.16))}
.logo-word{margin:0;font-size:clamp(56px,16vw,88px);line-height:.9;letter-spacing:.12em;font-weight:900}
.menu-stack{width:100%;display:grid;gap:14px}
.menu-btn{width:100%;min-height:60px;padding:0 18px;border-radius:18px;background:linear-gradient(180deg, rgba(19,26,48,.92), rgba(10,14,27,.96));border:1px solid rgba(130,168,255,.18);color:var(--text);font-size:20px;font-weight:700;text-align:center;box-shadow:0 14px 34px rgba(0,0,0,.22)}
.menu-btn-primary{border-color:rgba(116,240,255,.4);box-shadow:0 0 0 1px rgba(116,240,255,.12),0 18px 40px rgba(19,96,132,.24)}
.menu-btn:active,.icon-btn:active,.pad:active{transform:scale(.985)}

#gameScreen{
  grid-template-rows:auto auto 1fr auto;
  gap:8px;
  padding:calc(var(--safe-top) + 8px) var(--pad) calc(var(--safe-bottom) + 8px);
  align-content:start;
  width:100%;
  max-width:520px;
  margin:0 auto
}
.hud{display:grid;grid-template-columns:48px repeat(3,1fr);gap:6px;align-items:stretch}
.icon-btn,.stat,.mini-card,.pad,.dialog{background:linear-gradient(180deg, rgba(17,23,43,.95), rgba(10,14,26,.96));border:1px solid rgba(127,169,255,.18);box-shadow:0 12px 28px rgba(0,0,0,.22)}
.icon-btn{border-radius:16px;display:grid;place-items:center;font-size:18px;min-height:48px}
.stat{border-radius:16px;min-width:0;padding:8px 8px 7px;display:grid;justify-items:center;align-content:center}
.stat span{font-size:10px;line-height:1;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);white-space:nowrap}
.stat strong{display:block;max-width:100%;font-size:clamp(14px,4vw,20px);line-height:1.1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.board-panel{min-height:0;display:flex;flex-direction:column;align-items:center;gap:8px}
.mini-row{display:grid;grid-template-columns:1fr 1fr;gap:8px;width:100%;max-width:320px}
.mini-card{border-radius:16px;padding:8px 10px;display:grid;grid-template-columns:auto 56px;align-items:center;min-height:64px}
.mini-card span{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}
.mini-card canvas{width:56px;height:56px;justify-self:end}
.board-stage{
  position:relative;
  width:min(100%,220px);
  aspect-ratio:1/2;
  border-radius:22px;
  border:1px solid rgba(127,169,255,.18);
  background:linear-gradient(180deg, rgba(11,18,34,.96), rgba(7,11,21,.98));
  overflow:hidden;
  box-shadow:0 22px 52px rgba(0,0,0,.36), inset 0 0 0 1px rgba(116,240,255,.05);
  flex-shrink:0
}
.board-stage canvas{
  position:absolute;
  top:0;left:0;
  width:100%;
  height:100%;
  display:block;
  touch-action: none;
  -webkit-touch-callout: none;
  user-select: none;
  -webkit-user-select: none;
}
.controls{display:grid;grid-template-rows:auto auto;gap:10px}
.pad{position:relative;min-height:74px;border-radius:20px;overflow:hidden;touch-action:none;display:grid;place-items:center;padding:10px 14px;text-align:center}
.pad-label{position:relative;z-index:2;font-size:12px;line-height:1.2;color:#d9e5ff;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%}
.pad-grid{position:absolute;inset:0;background:linear-gradient(90deg, transparent 0 calc(10% - 1px), rgba(116,240,255,.08) calc(10% - 1px) 10%);background-size:10% 100%;opacity:.6}
.action-center{position:absolute;inset:0;display:grid;place-items:center;font-size:22px;color:rgba(255,255,255,.18);pointer-events:none}
body.large-pads .pad{min-height:92px}
body.reduced-motion .glow{display:none}

.overlay{position:absolute;inset:0;background:rgba(3,5,10,.56);backdrop-filter:blur(8px);display:none;place-items:center;padding:20px}
.overlay.open{display:grid}
.dialog{width:min(100%,420px);border-radius:22px;padding:18px;background:linear-gradient(180deg, rgba(17,23,43,.98), rgba(10,14,26,.98));}
.dialog.compact{width:min(100%,360px)}
.dialog-head{display:flex;align-items:center;justify-items:space-between;gap:12px;margin-bottom:14px}
.dialog-head.simple{justify-content:center}
.dialog-head h2{margin:0;font-size:24px;letter-spacing:.06e;text-transform:uppercase}
.close-btn{width:40px;height:40px}
.dialog-body{display:grid;gap:10px}
.short-list p,.toggle-row,.result-box{margin:0;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 14px;border-radius:16px;background:rgba(255,255,255,.03);border:1px solid rgba(127,169,255,.12)}
.short-list strong,.toggle-row span,.result-box span{font-size:14px}
.short-list p span,.result-box strong{color:var(--muted);font-size:14px}
.toggle-row input{width:20px;height:20px}
.button-list{display:grid;gap:12px}
.result-boxes{display:grid;gap:12px}

@media (min-width: 760px){
  #gameScreen{max-width:520px;margin:0 auto}
}

/* Hide on-screen controller pads on touch devices (iOS/Android) */
/* Touch controls on the board are used instead */
@media (hover: none) and (pointer: coarse) {
  .controls { display: none !important; }
}

/* Kinetic Swap: 180° rotation of the grid like a flipping blackboard */
.board-stage.grid-flip {
  animation: gridFlip 1.2s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}
@keyframes gridFlip {
  0%   { transform: rotateX(0deg); }
  50%  { transform: rotateX(90deg); }  /* midpoint — halfway flipped */
  100% { transform: rotateX(180deg); }
}

/* 3D flip animation for the grid container */
#gameScreen {
  perspective: 800px;
}
.board-stage.grid-flip {
  animation: gridFlip 1.2s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  backface-visibility: hidden;
  transform-origin: center center;
}
@keyframes gridFlip {
  0%   { transform: rotateX(0deg); }
  50%  { transform: rotateX(90deg); }   /* edge-on — board invisible */
  100% { transform: rotateX(180deg); }
}

/* Timer + lives below the grid */
.hud-below {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: min(100%, 220px);
  margin: 0 auto;
  padding: 4px 2px 0;
  font-size: 11px;
  font-family: Inter, sans-serif;
}
.hud-timer {
  color: #74f0ff;
  font-weight: 700;
  letter-spacing: .06em;
}
.hud-lives {
  color: #ffd54f;
  font-weight: 700;
}