/* Sudoku — bright Baithak theme (paper board, high-contrast ink digits) */
:root {
  --bg0: #fff8e7;
  --bg1: #ffefd9;
  --amber: #ffb020;
  --amber-l: #ffd166;
  --amber-d: #c77e00;
  --ink: #26266e;
  --paper: #fffdf7;
  --grid-thin: #d9d4e6;
  --user-blue: #1d4ed8;
  --bad: #e5484d;
  --note: #9a94ad;
  --text: #3a2c1c;
  --text-dim: #8a755c;
  --radius: 18px;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body { margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans", sans-serif;
  color: var(--text);
  /* page background comes from shared baithak.css (bright gradient) */
  min-height: 100dvh;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  display: flex;
  flex-direction: column;
  align-items: center;
}

#confetti {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100dvh;
  pointer-events: none;
  z-index: 60;
  display: none;
}
#confetti.show { display: block; }

/* ---------- header ---------- */
.topbar {
  width: 100%;
  max-width: 520px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 16px 4px;
}

.title-wrap { display: flex; align-items: center; gap: 10px; }
.title-wrap h1 {
  margin: 0;
  font-family: 'Baloo 2', system-ui, sans-serif;
  font-weight: 800;
  font-size: 26px;
  letter-spacing: .5px;
  color: #3a2c1c;
  text-shadow: 0 2px 12px rgba(255, 176, 32, .35);
}

.diff-badge {
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1px;
  background: rgba(255, 176, 32, .15);
  border: 1.5px solid var(--amber);
  color: var(--amber-d);
  border-radius: 999px;
  padding: 4px 12px;
}

.timer-wrap { display: flex; align-items: center; gap: 8px; }
#timer {
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  font-size: 18px;
  min-width: 58px;
  text-align: right;
}
.strikes { font-size: 15px; letter-spacing: 1px; min-width: 8px; }

.icon-btn {
  border: 2px solid rgba(255, 176, 32, .4);
  background: rgba(255, 176, 32, .1);
  color: var(--text);
  border-radius: 12px;
  width: 44px;
  height: 44px;
  font-size: 19px;
  cursor: pointer;
  transition: transform .12s ease, background .15s ease;
}
.icon-btn:active { transform: scale(.9); background: rgba(255, 176, 32, .25); }

/* ---------- board ---------- */
.game {
  width: 100%;
  max-width: 520px;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 12px 28px;
}

#board-wrap {
  position: relative;
  width: min(94vw, 58dvh, 460px);
  margin-top: 8px;
}

#board {
  position: relative;
  container-type: inline-size;
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  background: var(--paper);
  border: 3px solid var(--ink);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow:
    0 14px 44px rgba(120, 80, 20, .18),
    0 0 34px rgba(255, 176, 32, .18);
}

.cell {
  position: relative;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-right: 1px solid var(--grid-thin);
  border-bottom: 1px solid var(--grid-thin);
  transition: background .12s ease;
}
.cell.bl { border-left: 2px solid var(--ink); }
.cell.bt { border-top: 2px solid var(--ink); }

.cell .val {
  font-size: 8.5cqw;
  font-weight: 800;
  line-height: 1;
  color: var(--user-blue);
}
.cell.given .val { color: var(--ink); }
.cell.bad .val { color: var(--bad); }

.cell.rel { background: #eef0ff; }
.cell.same { background: #dde3ff; }
.cell.sel {
  background: #cfd8ff;
  outline: 3px solid #5b6ee1;
  outline-offset: -3px;
  border-radius: 4px;
  z-index: 1;
}

.notes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  width: 100%;
  height: 100%;
  padding: 8%;
  font-size: 3.6cqw;
  font-weight: 700;
  color: var(--note);
}
.notes span { display: flex; align-items: center; justify-content: center; }

/* bouncy cell animations */
@keyframes pop {
  0% { transform: scale(.5); }
  55% { transform: scale(1.18); }
  100% { transform: scale(1); }
}
.cell.pop .val { animation: pop .28s cubic-bezier(.2, 1.4, .4, 1); }

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}
.cell.shake { animation: shake .25s ease; }

#paused-overlay {
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  border: 0;
  background: rgba(43, 32, 20, .78);
  backdrop-filter: blur(6px);
  color: var(--amber-l);
  font-size: 24px;
  font-weight: 800;
  cursor: pointer;
  z-index: 5;
}
#paused-overlay small { font-size: 15px; font-weight: 600; color: var(--text-dim); }
.hidden { display: none !important; }

/* ---------- toolbar ---------- */
.toolbar {
  display: flex;
  gap: 10px;
  margin: 14px 0 4px;
}

.tool {
  display: flex;
  align-items: center;
  gap: 7px;
  border: 2px solid #eadfc8;
  background: #fffdf8;
  color: var(--text);
  border-radius: 999px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  transition: transform .12s ease, background .15s ease, border-color .15s ease;
  box-shadow: 0 2px 8px rgba(120, 80, 20, .08);
}
.tool .t-ico { font-size: 17px; }
.tool:active { transform: scale(.93); }
.tool.on {
  background: linear-gradient(180deg, var(--amber-l), var(--amber));
  border-color: var(--amber);
  color: var(--ink);
  box-shadow: 0 4px 14px rgba(255, 176, 32, .4);
}
.tool.empty { opacity: .45; }
.tool b {
  background: var(--amber);
  color: #2a1a00;
  border-radius: 999px;
  font-size: 12px;
  padding: 1px 8px;
  margin-left: 2px;
}

/* ---------- number pad ---------- */
#pad {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 6px;
  width: min(94vw, 58dvh, 460px);
  margin-top: 10px;
}

.pk {
  border: 2px solid #eadfc8;
  background: #fffdf8;
  border-radius: 14px;
  padding: 8px 0 6px;
  cursor: pointer;
  color: var(--text);
  font-family: inherit;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  transition: transform .1s ease, background .15s ease;
  min-height: 58px;
  box-shadow: 0 2px 8px rgba(120, 80, 20, .08);
}
.pk .d {
  font-size: 22px;
  font-weight: 800;
  color: var(--amber-d);
  line-height: 1.1;
}
.pk .left {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
}
.pk:active { transform: scale(.9); background: rgba(255, 176, 32, .2); }
.pk.done { opacity: .35; }
.pk.done .d { color: var(--text-dim); }

.tip {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--text-dim);
  text-align: center;
}

/* ---------- overlays ---------- */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(58, 44, 28, .55);
  backdrop-filter: blur(8px);
}

.overlay .card {
  width: min(92vw, 380px);
  background: #fffdf8;
  border: 2px solid #eadfc8;
  border-radius: 24px;
  padding: 28px 24px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(120, 80, 20, .25), 0 0 40px rgba(255, 176, 32, .15);
  animation: spring-in .38s cubic-bezier(.2, 1.4, .4, 1);
}

@keyframes spring-in {
  0% { transform: scale(.7); opacity: 0; }
  60% { transform: scale(1.05); opacity: 1; }
  100% { transform: scale(1); }
}

.overlay .logo { font-size: 52px; }
.overlay h2 {
  margin: 10px 0 6px;
  font-size: 30px;
  font-family: 'Baloo 2', system-ui, sans-serif;
  font-weight: 800;
  color: #3a2c1c;
}
.overlay .sub { margin: 0 0 18px; color: var(--text-dim); font-size: 15px; }

.seg {
  display: flex;
  gap: 6px;
  background: #f3ead8;
  border-radius: 999px;
  padding: 5px;
  margin-bottom: 12px;
}
.seg button {
  flex: 1;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--text-dim);
  font-family: inherit;
  font-size: 14px;
  font-weight: 800;
  padding: 10px 4px;
  cursor: pointer;
  transition: all .15s ease;
}
.seg button.on {
  background: linear-gradient(180deg, var(--amber-l), var(--amber));
  color: #2a1a00;
  box-shadow: 0 3px 10px rgba(255, 176, 32, .45);
  transform: scale(1.03);
}

.btn-big {
  width: 100%;
  border: 0;
  border-radius: 999px;
  padding: 15px;
  font-size: 18px;
  font-weight: 800;
  font-family: inherit;
  cursor: pointer;
  background: linear-gradient(180deg, var(--amber-l), var(--amber));
  color: #2a1a00;
  box-shadow: 0 5px 0 var(--amber-d), 0 10px 24px rgba(255, 176, 32, .35);
  transition: transform .1s ease;
  margin-top: 6px;
}
.btn-big:active { transform: translateY(4px); box-shadow: 0 1px 0 var(--amber-d); }

.stats {
  display: flex;
  justify-content: center;
  gap: 26px;
  margin: 4px 0 16px;
}
.stats div { display: flex; flex-direction: column; gap: 2px; }
.stats b { font-size: 22px; color: var(--amber-d); font-variant-numeric: tabular-nums; }
.stats span { font-size: 12px; color: var(--text-dim); text-transform: uppercase; letter-spacing: 1px; }

@media (max-width: 380px) {
  .tool { padding: 9px 12px; font-size: 13px; }
  .pk { min-height: 52px; }
  .pk .d { font-size: 19px; }
}

/* ---------- Baithak animated theme: sudoku (signature accents) ---------- */
body[data-bgfx="sudoku"] { --accent: #5b6ee1; --accent-2: #ffb020; }
/* soft grid shimmer sweeping across the paper board (GPU-friendly transform) */
#board::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  pointer-events: none;
  background: linear-gradient(115deg, transparent 32%, rgba(255, 255, 255, .30) 48%, transparent 64%);
  transform: translateX(-130%);
  animation: grid-shimmer 7s ease-in-out infinite;
}
@keyframes grid-shimmer {
  0%, 55% { transform: translateX(-130%); }
  90%, 100% { transform: translateX(130%); }
}
/* floating logo on the setup / result cards */
.overlay .logo { display: inline-block; animation: logo-float 3.2s ease-in-out infinite; }
@keyframes logo-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
/* number-pad key tap feedback */
.pk { will-change: transform; }
@media (prefers-reduced-motion: reduce) {
  #board::after, .overlay .logo { animation: none !important; }
}