:root{
  --bg:#0b1020;
  --text:#e9ecff;
  --muted:#aab2ff;
  --accent:#7aa2ff;
  --bad:#ff6b6b;
  --good:#43d19e;
  --cell:46px;
  --radius:14px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial;
  background: radial-gradient(1200px 800px at 30% 10%, #18204a 0%, var(--bg) 55%);
  color:var(--text);
}

.topbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:14px 16px;
  border-bottom:1px solid rgba(255,255,255,0.06);
  background:rgba(5,8,18,0.55);
  backdrop-filter: blur(10px);
  position:sticky;
  top:0;
  z-index:10;
}

.topbar h1{margin:0;font-size:18px;letter-spacing:.3px}
.topbar-right{display:flex;align-items:center;gap:10px}

.timer{
  padding:8px 10px;
  border:1px solid rgba(255,255,255,0.10);
  border-radius:12px;
  background: rgba(0,0,0,0.25);
  font-variant-numeric: tabular-nums;
}

.layout{
  display:grid;
  grid-template-columns: 1fr 320px;
  gap:16px;
  padding:16px;
  max-width: 1100px;
  margin: 0 auto;
}

@media (max-width: 980px){
  .layout{grid-template-columns:1fr}
  .side{display:none;}
}

.boardWrap{
  position:relative;
  background: rgba(255,255,255,0.04);
  border:1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding:14px;
}

.gameTop{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  margin-bottom: 12px;
}

/* Menus (using <details>) */
.menu{position:relative}
.menu > summary{
  list-style:none;
  cursor:pointer;
  user-select:none;
}
.menu > summary::-webkit-details-marker{display:none}

.menuBtn, .newBtn, button{
  background: rgba(255,255,255,0.06);
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.10);
  padding:10px 12px;
  border-radius: 12px;
  cursor:pointer;
}

.menuBtn{width:44px; text-align:center; font-size:18px; line-height:1;}
.newBtn{white-space:nowrap;}

button:hover, .menuBtn:hover, .newBtn:hover{
  border-color: rgba(122,162,255,0.7);
}

button:active, .menuBtn:active, .newBtn:active{
  transform: translateY(1px);
}

button:disabled{
  opacity:0.45;
  cursor:not-allowed;
}

.menuPanel{
  position:absolute;
  top: calc(100% + 8px);
  left:0;
  min-width: 190px;
  background: rgba(10,14,30,0.95);
  border:1px solid rgba(255,255,255,0.12);
  border-radius: 14px;
  padding:10px;
  display:flex;
  flex-direction:column;
  gap:8px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.45);
  z-index: 20;
}

#newMenu .menuPanel{right:0; left:auto; min-width: 210px;}

.menuPanel button{
  width:100%;
  text-align:left;
  border-radius: 12px;
}

.board{
  display:grid;
  grid-template-columns: repeat(9, var(--cell));
  grid-template-rows: repeat(9, var(--cell));
  width: calc(var(--cell) * 9);
  max-width: 100%;
  margin: 0 auto 12px auto;
  border: 2px solid rgba(255,255,255,0.18);
  border-radius: 12px;
  overflow:hidden;
}

@media (max-width: 430px){
  :root{ --cell: 40px; }
}
@media (max-width: 360px){
  :root{ --cell: 36px; }
}

.cell{
  position:relative;
  display:flex;
  align-items:center;
  justify-content:center;
  border:1px solid rgba(255,255,255,0.08);
  background: rgba(10,14,30,0.35);
  cursor:pointer;
  user-select:none;
  outline:none;
}
.cell.given{background: rgba(255,255,255,0.06); cursor:default}
.cell.selected{box-shadow: inset 0 0 0 2px rgba(122,162,255,0.9)}
.cell.peer{background: rgba(122,162,255,0.08)}
.cell.same{background: rgba(122,162,255,0.14)}
.cell.conflict{background: rgba(255,107,107,0.16)}
.cell .val{font-size:20px;font-weight:650}
.cell.given .val{color: rgba(233,236,255,0.92)}
.cell:not(.given) .val{color: rgba(122,162,255,0.95)}

.cell .notes {
  position: absolute;
  inset: 2px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 0;
  font-size: 10px;
  color: rgba(233,236,255,0.65);
  pointer-events: none;
}

.cell .notes span{
  display:flex;
  align-items:center;
  justify-content:center;
  opacity:0;
  line-height: 1;
}
.cell .notes span.on{opacity:1}

@media (max-width: 420px) {
  .cell .notes {
    font-size: 9px;
  }
}

/* Block borders */
.cell:nth-child(3n):not(:nth-child(9n)){
  border-right:2px solid rgba(255,255,255,0.18);
}
.cell:nth-child(n+19):nth-child(-n+27),
.cell:nth-child(n+46):nth-child(-n+54){
  border-bottom:2px solid rgba(255,255,255,0.18);
}

/* Keypad row: one row of 9 */
.keypadRow{
  display:grid;
  grid-template-columns: repeat(9, 1fr);
  gap:8px;
  margin: 0 auto 10px auto;
  width: min(520px, 100%);
}
.keypadRow .key{
  padding:12px 0;
  border-radius: 14px;
  font-size: 16px;
  text-align:center;
}

/* Control row under keypad */
.controlRow{
  display:grid;
  grid-template-columns: repeat(6, 1fr);
  gap:8px;
  width: min(520px, 100%);
  margin: 0 auto;
}
@media (max-width: 520px){
  .controlRow{
    grid-template-columns: repeat(3, 1fr);
  }
}

.statusWrap{
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.status{margin:0; color: rgba(233,236,255,0.85)}

.side .card{
  background: rgba(255,255,255,0.04);
  border:1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding:16px;
}
.side h2{margin:0 0 10px 0; font-size:16px; color: rgba(233,236,255,0.95)}
.side ul{margin:0; padding-left:18px; color: rgba(233,236,255,0.82)}

.footer{
  padding:16px;
  text-align:center;
  color: rgba(233,236,255,0.62);
}

/* ---- Pause: blur/disable gameContent, overlay stays crisp ---- */
body.isPaused #gameContent{
  pointer-events: none;
  filter: blur(7px) saturate(0.9) brightness(0.9);
  transform: translateZ(0); /* keep blur smooth on some browsers */
}

.pauseOverlay{
  position: fixed;
  inset: 0;
  display: none;
  align-items:center;
  justify-content:center;
  background: rgba(0,0,0,0.40);
  z-index: 999;
  padding: 18px;
}

body.isPaused .pauseOverlay{
  display: flex;
}

.pauseCard{
  background: rgba(10,14,30,0.96);
  border:1px solid rgba(255,255,255,0.12);
  border-radius: 16px;
  padding:16px 18px;
  text-align:center;
  width: min(340px, 92vw);
  box-shadow: 0 12px 30px rgba(0,0,0,0.55);
}

.pauseTitle{font-size:18px; font-weight:700; margin-bottom:6px;}
.pauseHint{color: rgba(233,236,255,0.78); font-size:13px; margin-bottom: 12px;}

.resumeBtn{
  width: 100%;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid rgba(122,162,255,0.55);
}
.resumeBtn:hover{
  border-color: rgba(122,162,255,0.9);
}