:root{
  --bg0:#070913;
  --bg1:#0b1024;
  --panel:rgba(16,20,40,.72);
  --border:rgba(122,168,255,.18);
  --text:#e9f0ff;
  --muted:rgba(233,240,255,.72);
  --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{min-height:100dvh; display:flex; flex-direction:column}
.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(41,242,212,.14), transparent 60%),
    radial-gradient(900px 520px at 80% -40%, rgba(124,92,255,.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(41,242,212,.28); background:rgba(41,242,212,.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(124,92,255,.30);
  background:rgba(124,92,255,.08);
  box-shadow: 0 26px 90px rgba(0,0,0,.30);
}
.btn--primary:hover{border-color:rgba(41,242,212,.42)}

.main{padding:10px 12px 12px; width:min(1200px, 100%); margin:0 auto}
.gameShell{flex:1; display:flex; flex-direction:column; gap:10px}

.hud{
  display:grid;
  grid-template-columns: repeat(5, minmax(0, 1fr)) auto;
  gap:8px;
  align-items:stretch;
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:8px;
  box-shadow:var(--shadow);
}
.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}
.hud__actions{display:flex; gap:10px; align-items:stretch}

.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{
  flex:1;
  min-height:0;
  display:grid;
  grid-template-columns: 1fr;
  gap:10px;
}
.playRow{
  flex:1;
  min-height:0;
  display:grid;
  grid-template-columns: auto 190px;
  gap:10px;
  align-items:start;
  justify-content:center;
}
.boardWrap{
  --tsb-cols: 10;
  --tsb-rows: 20;
  --reserved: 190px;
  --cell-size: clamp(14px, min(calc(78vw / var(--tsb-cols)), calc((100dvh - var(--reserved)) / var(--tsb-rows))), 34px);
  position:relative;
  width: calc(var(--cell-size) * var(--tsb-cols) + 24px);
  height: calc(var(--cell-size) * var(--tsb-rows) + 24px);
  max-height:none;
  margin:0 auto;
  border-radius:24px;
  overflow:hidden;
  background:
    radial-gradient(900px 520px at 50% 0%, rgba(45,242,255,.10), transparent 62%),
    radial-gradient(900px 520px 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);
}
canvas#game{width:100%; height:100%; display:block; touch-action:none}

.sidePanel{
  width:190px;
  display:flex;
  flex-direction:column;
  gap:10px;
}
.panelCard{
  border-radius:18px;
  background:rgba(10,12,26,.70);
  border:1px solid rgba(255,255,255,.10);
  padding:10px;
  backdrop-filter: blur(8px);
}
.panelCard__label{font-size:11px; color:rgba(233,240,255,.72); letter-spacing:.25px; text-transform:uppercase; font-weight:850}
canvas#next{width:100%; height:140px; display:block; margin-top:8px}
.panelHint{
  border-radius:18px;
  background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.06);
  padding:10px;
  color:rgba(233,240,255,.72);
  font-size:12px;
  line-height:1.35;
}

.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(560px, 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:12px;
  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:6;
}
.toast--show{opacity:1; transform:translateX(-50%) translateY(-4px)}

.mobileControls{
  width:min(92vw, 560px);
  margin:0 auto;
  display:none;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows:auto auto;
  gap:10px;
  padding-bottom: env(safe-area-inset-bottom);
}
.mspacer{min-height:56px; border-radius:18px; visibility:hidden}
.mbtn{
  min-height:56px;
  border-radius:18px;
  border:1px solid rgba(255,255,255,.10);
  background:
    radial-gradient(120px 90px at 30% 20%, rgba(255,255,255,.10), transparent 58%),
    linear-gradient(180deg, rgba(255,255,255,.08), rgba(255,255,255,.03));
  color:var(--text);
  font-weight:950;
  font-size:18px;
  cursor:pointer;
  user-select:none;
  -webkit-user-select:none;
  touch-action:manipulation;
}
.mbtn:active{transform:translateY(1px)}
.mbtn--primary{
  border-color:rgba(45,242,255,.22);
  background:
    radial-gradient(140px 90px at 30% 20%, rgba(45,242,255,.20), transparent 58%),
    linear-gradient(180deg, rgba(45,242,255,.10), rgba(45,242,255,.03));
}
 

.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;
}
.note{font-size:12px; color:rgba(233,240,255,.64); margin-top:4px}
.howText{margin:0 0 10px; color:rgba(233,240,255,.78); line-height:1.5}
.how{margin:0; padding-left:18px; color:rgba(233,240,255,.78); line-height:1.55}
.how b{color:rgba(233,240,255,.96)}

@media (max-width: 860px){
  .playRow{grid-template-columns: 1fr; justify-items:center}
  .sidePanel{width:min(92vw, 520px); flex-direction:row; justify-content:space-between; align-items:stretch}
  .panelCard{flex:1}
  .panelHint{display:none}
  .boardWrap{--reserved: 240px; --cell-size: clamp(13px, min(calc(92vw / var(--tsb-cols)), calc((100dvh - var(--reserved)) / var(--tsb-rows))), 30px);}
  .mobileControls{display:grid}
}
@media (max-width: 520px){
  .hud{grid-template-columns: repeat(2, minmax(0, 1fr)); grid-auto-rows:auto}
  .hud__actions{grid-column: 1 / -1; justify-content:space-between}
  .title__sub{display:none}
  .topbar{padding:8px 10px 6px}
  .main{padding:8px 10px 12px}
  .gameShell{gap:8px}
  .hud{gap:6px; padding:6px}
  .hud__item{padding:6px 8px}
  .hud__value{font-size:16px}
  body{overflow-x:hidden; overflow-y:auto; -webkit-overflow-scrolling: touch;}
  .playRow{
    width:min(94vw, 520px);
    display:grid;
    grid-template-columns: 1fr 92px;
    gap:10px;
    align-items:start;
    justify-content:center;
  }
  .boardWrap{
    --reserved: 320px;
    --cell-size: clamp(12px, min(calc((94vw - 92px - 10px) / var(--tsb-cols)), calc((100dvh - var(--reserved)) / var(--tsb-rows))), 26px);
  }
  .sidePanel{width:92px; flex-direction:column; gap:10px}
  .panelHint{display:none}
  .panelCard{padding:8px}
  canvas#next{height:96px}
  .mobileControls{width:min(94vw, 520px)}
}