:root{
  --bg0:#070913;
  --bg1:#0b1024;
  --panel:rgba(16,20,40,.72);
  --panel2:rgba(12,14,28,.78);
  --border:rgba(122,168,255,.18);
  --text:#e9f0ff;
  --muted:rgba(233,240,255,.72);
  --accent:#2df2ff;
  --accent2:#8b5cff;
  --danger:#ff3d71;
  --shadow:0 18px 50px rgba(0,0,0,.45);
  --radius:16px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  color:var(--text);
  font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Arial,"Apple Color Emoji","Segoe UI Emoji";
  background:
    radial-gradient(1100px 700px at 20% 10%, rgba(45,242,255,.18), transparent 58%),
    radial-gradient(900px 600px at 80% 20%, rgba(139,92,255,.16), transparent 60%),
    radial-gradient(1200px 800px at 50% 100%, rgba(60,255,143,.10), transparent 62%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
  overflow:hidden;
}

.page{height:100dvh; display:flex; flex-direction:column; overflow:hidden}
.topbar{
  padding:12px 14px 10px;
  display:flex;
  gap:12px;
  align-items:center;
  justify-content:space-between;
  position:sticky;
  top:0;
  z-index:20;
  background:
    radial-gradient(900px 520px at 20% -40%, rgba(45,242,255,.14), transparent 60%),
    radial-gradient(900px 520px at 80% -40%, rgba(139,92,255,.12), transparent 60%),
    linear-gradient(180deg, rgba(7,9,19,.92), rgba(7,9,19,.62));
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom:1px solid rgba(255,255,255,.10);
  box-shadow: 0 14px 60px rgba(0,0,0,.35);
}
.back{
  text-decoration:none;
  color:var(--text);
  display:flex;
  align-items:center;
  gap:10px;
  padding:10px 12px;
  border-radius:999px;
  background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.10);
  box-shadow: 0 18px 70px rgba(0,0,0,.18);
  transition: transform .15s ease, border-color .15s ease, background .15s ease;
}
.back:hover{border-color:rgba(45,242,255,.28); background:rgba(45,242,255,.06); transform:translateY(-1px)}
.back:active{transform:translateY(1px)}
.back__chev{font-size:18px; opacity:.95}
.back__text{font-weight:750; letter-spacing:.2px}
.title{min-width:0}
.title__name{font-weight:900; letter-spacing:.2px; font-size:18px; line-height:1.1}
.title__sub{font-size:12px; color:var(--muted); margin-top:2px; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; max-width:44vw}
.topbar__right{display:flex; gap:10px; align-items:center}

/* Header button polish (no content changes) */
.btn{
  border-radius:999px;
  border:1px solid rgba(255,255,255,.12);
  background:rgba(255,255,255,.04);
  box-shadow: 0 18px 70px rgba(0,0,0,.18);
  transition: transform .15s ease, border-color .15s ease, background .15s ease, box-shadow .15s ease;
}
.btn:hover{
  transform:translateY(-1px);
  border-color:rgba(139,92,255,.30);
  background:rgba(139,92,255,.08);
  box-shadow: 0 26px 90px rgba(0,0,0,.30);
}
.btn--primary:hover{border-color:rgba(45,242,255,.42)}

.main{padding:10px 12px 12px; width:min(1100px, 100%); margin:0 auto}
.gameShell{
  flex:1;
  display:flex;
  flex-direction:column;
  gap:10px;
  overflow:hidden;
}
.hud{
  display:grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap:10px;
  align-items:stretch;
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:10px;
  box-shadow:var(--shadow);
}
.hud--compact{
  padding:8px;
  gap:8px;
}
.hud__item{
  padding:8px 10px;
  border-radius:14px;
  background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.06);
  min-width:0;
}
.hud__label{font-size:11px; color:var(--muted); letter-spacing:.25px; text-transform:uppercase}
.hud__value{font-size:18px; font-weight:900; margin-top:4px}

.btn{
  appearance:none;
  border:1px solid rgba(255,255,255,.10);
  background:linear-gradient(180deg, rgba(255,255,255,.10), rgba(255,255,255,.04));
  color:var(--text);
  padding:10px 12px;
  border-radius:14px;
  font-weight:850;
  letter-spacing:.2px;
  cursor:pointer;
  min-height:44px;
  touch-action:manipulation;
}
.btn:active{transform:translateY(1px)}
.btn--primary{
  border-color:rgba(45,242,255,.28);
  background:
    radial-gradient(120px 80px at 30% 20%, rgba(45,242,255,.26), transparent 55%),
    linear-gradient(180deg, rgba(45,242,255,.16), rgba(45,242,255,.06));
}
.btn--ghost{background:transparent; border:1px solid rgba(255,255,255,.10)}
.btn--danger{
  border-color:rgba(255,61,113,.32);
  background:
    radial-gradient(120px 80px at 30% 20%, rgba(255,61,113,.22), transparent 55%),
    linear-gradient(180deg, rgba(255,61,113,.16), rgba(255,61,113,.06));
}

.play{
  margin-top:0;
  display:grid;
  grid-template-columns: 1fr;
  gap:10px;
  align-items:start;
}
.play--stack{
  flex:1;
  min-height:0;
}

.boardWrap{
  --board-size: min(92vw, 56dvh);
  position:relative;
  border-radius:24px;
  overflow:hidden;
  background:
    radial-gradient(900px 500px at 50% 0%, rgba(45,242,255,.10), transparent 62%),
    radial-gradient(900px 500px at 50% 100%, rgba(139,92,255,.12), transparent 62%),
    linear-gradient(180deg, rgba(5,7,16,.92), rgba(12,14,28,.92));
  border:1px solid rgba(122,168,255,.20);
  box-shadow:var(--shadow);
  width:var(--board-size);
  height:var(--board-size);
  margin:0 auto;
}
.boardGlow{
  position:absolute;
  inset:-2px;
  pointer-events:none;
  background:
    radial-gradient(260px 240px at 20% 16%, rgba(45,242,255,.16), transparent 62%),
    radial-gradient(300px 240px at 84% 18%, rgba(139,92,255,.16), transparent 60%),
    radial-gradient(300px 240px at 70% 92%, rgba(60,255,143,.12), transparent 62%);
  mix-blend-mode:screen;
  opacity:.95;
}
.board{
  position:absolute;
  inset:0;
  padding: clamp(8px, 2.6vw, 18px);
  display:grid;
  grid-template-columns: repeat(10, 1fr);
  grid-template-rows: repeat(10, 1fr);
  gap: clamp(3px, 0.9vw, 7px);
  touch-action:none;
}
.cell{
  border-radius:12px;
  background:rgba(255,255,255,.05);
  border:1px solid rgba(255,255,255,.06);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.06);
}
.cell--filled{
  border-color:rgba(255,255,255,.12);
}
.cell--previewOk{
  outline:2px solid rgba(60,255,143,.55);
  box-shadow:0 0 0 3px rgba(60,255,143,.18);
}
.cell--previewBad{
  outline:2px solid rgba(255,61,113,.65);
  box-shadow:0 0 0 3px rgba(255,61,113,.18);
}
.cell--clearFlash{
  animation:flash .20s ease-in-out 0s 3;
}
@keyframes flash{
  0%{filter:brightness(1)}
  50%{filter:brightness(1.7)}
  100%{filter:brightness(1)}
}

.overlay{
  position:absolute;
  inset:0;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:16px;
  background:rgba(4,6,14,.55);
  backdrop-filter: blur(10px);
  z-index:4;
}
.overlay--hidden{display:none}
.card{
  width:min(520px, 100%);
  border-radius:22px;
  background:linear-gradient(180deg, rgba(18,22,44,.86), rgba(12,14,28,.78));
  border:1px solid rgba(122,168,255,.22);
  box-shadow:0 24px 70px rgba(0,0,0,.55);
  padding:18px;
}
.card__badge{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:6px 10px;
  border-radius:999px;
  border:1px solid rgba(45,242,255,.28);
  background:rgba(45,242,255,.10);
  color:rgba(233,240,255,.92);
  font-weight:900;
  font-size:12px;
  letter-spacing:.2px;
}
.card__badge--danger{border-color:rgba(255,61,113,.32); background:rgba(255,61,113,.12)}
.card__title{margin:12px 0 8px; font-size:28px; line-height:1.1; font-weight:950; letter-spacing:.2px}
.card__text{margin:0 0 14px; color:var(--muted); font-size:14px; line-height:1.45}
.card__row{display:flex; gap:10px; flex-wrap:wrap}
.card__hint{margin-top:12px; font-size:12px; color:rgba(233,240,255,.66)}

.toast{
  position:absolute;
  left:50%;
  bottom:14px;
  transform:translateX(-50%);
  padding:10px 12px;
  border-radius:999px;
  background:rgba(10,12,26,.82);
  border:1px solid rgba(255,255,255,.10);
  color:rgba(233,240,255,.86);
  font-weight:850;
  font-size:12px;
  letter-spacing:.2px;
  opacity:0;
  pointer-events:none;
  transition:opacity .18s ease, transform .18s ease;
  z-index:5;
}
.toast--show{opacity:1; transform:translateX(-50%) translateY(-4px)}

.scorePops{
  position:absolute;
  inset:0;
  pointer-events:none;
  z-index:3;
}
.pop{
  position:absolute;
  transform:translate(-50%,-50%);
  padding:6px 10px;
  border-radius:999px;
  background:rgba(10,12,26,.75);
  border:1px solid rgba(255,255,255,.10);
  font-weight:950;
  letter-spacing:.2px;
  font-size:12px;
  animation:pop 0.9s ease forwards;
}
@keyframes pop{
  0%{opacity:0; transform:translate(-50%,-50%) scale(.9)}
  12%{opacity:1; transform:translate(-50%,-60%) scale(1)}
  100%{opacity:0; transform:translate(-50%,-110%) scale(1.02)}
}

.trayWrap{
  background:var(--panel2);
  border:1px solid rgba(122,168,255,.18);
  border-radius:var(--radius);
  padding:10px;
  box-shadow:var(--shadow);
}
.trayWrap--below{
  width:min(92vw, 560px);
  margin:0 auto;
}
.tray{
  --piece-cell-size: clamp(10px, 2.2vw, 16px);
  display:grid;
  grid-auto-flow:column;
  grid-auto-columns: 1fr;
  gap:10px;
  align-items:stretch;
}
.piece{
  position:relative;
  border-radius:18px;
  border:1px solid rgba(255,255,255,.10);
  background:rgba(255,255,255,.04);
  padding:10px;
  min-height: calc(var(--piece-cell-size) * 5 + 20px);
  display:flex;
  align-items:center;
  justify-content:center;
  touch-action:none;
}
.piece--used{opacity:.35; filter:grayscale(.25); pointer-events:none}
.piece--selected{
  outline:2px solid rgba(45,242,255,.55);
  box-shadow:0 0 0 3px rgba(45,242,255,.18);
}
.pieceGrid{
  width:100%;
  height:100%;
  display:grid;
  gap:6px;
  place-content:center;
}
.pCell{
  width:var(--piece-cell-size);
  height:var(--piece-cell-size);
  border-radius:10px;
  background:transparent;
}
.pCell--on{
  border-radius:10px;
  box-shadow:
    0 10px 22px rgba(0,0,0,.35),
    inset 0 1px 0 rgba(255,255,255,.16);
  border:1px solid rgba(255,255,255,.16);
}

.dragGhost{
  --piece-cell-size: 14px;
  position:fixed;
  left:0; top:0;
  width:180px; height:180px;
  pointer-events:none;
  transform:translate(-9999px,-9999px);
  z-index:30;
  opacity:.96;
}
.dragGhost .piece{background:rgba(10,12,26,.72); border-color:rgba(255,255,255,.14)}

.modal{
  position:fixed;
  inset:0;
  z-index:20;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:16px;
}
.modal--hidden{display:none}
.modal__backdrop{position:absolute; inset:0; background:rgba(0,0,0,.55)}
.modal__panel{
  position:relative;
  width:min(560px, 100%);
  border-radius:22px;
  background:linear-gradient(180deg, rgba(18,22,44,.92), rgba(10,12,26,.86));
  border:1px solid rgba(122,168,255,.22);
  box-shadow:0 26px 80px rgba(0,0,0,.6);
  overflow:hidden;
}
.modal__head{
  padding:14px 14px 10px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  border-bottom:1px solid rgba(255,255,255,.06);
}
.modal__title{font-weight:950; font-size:16px; letter-spacing:.2px}
.iconBtn{
  width:42px; height:42px;
  border-radius:14px;
  border:1px solid rgba(255,255,255,.10);
  background:rgba(255,255,255,.06);
  color:var(--text);
  cursor:pointer;
  font-weight:950;
  touch-action:manipulation;
}
.modal__body{padding:14px}
.field{margin-bottom:12px}
.field--row{display:flex; gap:10px; align-items:center; justify-content:flex-end; margin-top:6px}
.field__label{display:block; font-size:12px; color:rgba(233,240,255,.72); margin-bottom:6px; font-weight:850; letter-spacing:.18px}
.field__control{
  width:100%;
  min-height:44px;
  border-radius:14px;
  border:1px solid rgba(255,255,255,.10);
  background:rgba(255,255,255,.06);
  color:var(--text);
  padding:10px 12px;
  outline:none;
}
.how{margin:0; padding-left:18px; color:rgba(233,240,255,.78); line-height:1.55}
.how b{color:rgba(233,240,255,.96)}

.cell--clearing{
  animation:clearPop .24s ease-in-out forwards;
}
@keyframes clearPop{
  0%{transform:scale(1); filter:brightness(1)}
  55%{transform:scale(1.10) rotate(-2deg); filter:brightness(1.75)}
  100%{transform:scale(.55); opacity:0; filter:brightness(1.2)}
}
.sparkle{
  position:absolute;
  width:8px;
  height:8px;
  border-radius:3px;
  background:rgba(255,255,255,.9);
  box-shadow:0 0 14px rgba(45,242,255,.35);
  transform:translate(-50%,-50%);
  animation:spark .55s ease-out forwards;
  pointer-events:none;
}
@keyframes spark{
  0%{opacity:0; transform:translate(-50%,-50%) scale(.8)}
  10%{opacity:1}
  100%{opacity:0; transform:translate(calc(-50% + var(--dx)), calc(-50% + var(--dy))) scale(.6)}
}
.bigShake{animation:bigShake .22s linear 0s 2}
@keyframes bigShake{
  0%{transform:translate3d(0,0,0)}
  20%{transform:translate3d(-5px,0,0)}
  40%{transform:translate3d(5px,0,0)}
  60%{transform:translate3d(-3px,0,0)}
  80%{transform:translate3d(3px,0,0)}
  100%{transform:translate3d(0,0,0)}
}

@media (max-width: 980px){
  .title__sub{max-width:52vw}
  .boardWrap{--board-size: min(94vw, 54dvh);}
}
@media (max-width: 520px){
  .hud{grid-template-columns: repeat(2, minmax(0, 1fr)); grid-auto-rows:auto}
  .title__sub{display:none}
  .gameShell{gap:8px}
  .boardWrap{--board-size: min(94vw, 52dvh);}
  .trayWrap--below{width:min(94vw, 560px)}
  .controlsRow{width:min(94vw, 560px)}
  .tray{gap:8px}
  .piece{padding:8px; min-height:82px}
  .pieceGrid{gap:5px}
  .board{gap: clamp(3px, .9vw, 6px)}
  .cell{border-radius:10px}
}
.controlsRow{
  width:min(92vw, 560px);
  margin:0 auto;
  display:grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap:10px;
}
.controlsRow .btn{min-height:44px}