/* EduFabTech — game-sudoku.css (Sudoku) — every class prefixed gm-sudoku- */
.gm-sudoku-box {
  width: min(560px, 100%);
  margin: 0 auto;
  padding: 10px;
  box-sizing: border-box;
  border: 2px solid transparent;
  border-radius: var(--radius, 12px);
  background: var(--surface, #10141c);
  font-family: var(--sans, system-ui, sans-serif);
  color: var(--text, #edf0f5);
}
.gm-sudoku-box.gm-sudoku-won { border-color: var(--brand, #43d49b); }

.gm-sudoku-bar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 8px;
  margin: 2px 2px 10px;
}
.gm-sudoku-time,
.gm-sudoku-miss {
  font-family: var(--mono, ui-monospace, monospace);
  font-size: .95rem;
  color: var(--muted, #6f7c8d);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.gm-sudoku-miss { text-align: right; }
.gm-sudoku-miss.gm-sudoku-has { color: var(--err, #ef6a62); }
.gm-sudoku-stat {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text, #edf0f5);
  text-align: center;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

/* ── board ── */
.gm-sudoku-board {
  display: flex;
  flex-direction: column;
  width: min(100%, 520px);
  aspect-ratio: 1 / 1;
  margin: 0 auto;
  box-sizing: border-box;
  border: 2px solid #6b7a96;
  border-radius: var(--radius-sm, 8px);
  overflow: hidden;
  background: var(--card, #131822);
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.gm-sudoku-row {
  display: grid;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  flex: 1 1 0;
  min-height: 0;
}
.gm-sudoku-cell {
  position: relative;
  min-width: 0;
  min-height: 0;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  border: 0;
  border-right: 1px solid #2a3443;
  border-bottom: 1px solid #2a3443;
  border-radius: 0;
  background: transparent;
  color: var(--brand, #43d49b);
  font-family: var(--sans, system-ui, sans-serif);
  font-size: clamp(1.05rem, 5.4vw, 1.75rem);
  font-weight: 600;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  outline: none;
}
.gm-sudoku-row .gm-sudoku-cell:last-child { border-right: 0; }
.gm-sudoku-row:last-child .gm-sudoku-cell { border-bottom: 0; }
.gm-sudoku-cell.gm-sudoku-br { border-right: 2px solid #6b7a96; }
.gm-sudoku-cell.gm-sudoku-bb { border-bottom: 2px solid #6b7a96; }

.gm-sudoku-cell.gm-sudoku-given { color: var(--text, #edf0f5); font-weight: 700; }
.gm-sudoku-cell.gm-sudoku-mine { color: var(--brand, #43d49b); }
.gm-sudoku-cell.gm-sudoku-bad {
  color: var(--err, #ef6a62);
  background: rgba(239, 106, 98, .14);
  text-decoration: underline wavy;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.gm-sudoku-cell.gm-sudoku-unit { background: rgba(255, 255, 255, .045); }
.gm-sudoku-cell.gm-sudoku-same { background: rgba(67, 212, 155, .14); }
.gm-sudoku-cell.gm-sudoku-bad.gm-sudoku-unit,
.gm-sudoku-cell.gm-sudoku-bad.gm-sudoku-same { background: rgba(239, 106, 98, .18); }
.gm-sudoku-cell.gm-sudoku-sel { background: rgba(67, 212, 155, .28); }
.gm-sudoku-cell:focus-visible { box-shadow: inset 0 0 0 2px var(--brand, #43d49b); }

.gm-sudoku-notes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  width: 100%;
  height: 100%;
  padding: 1px;
  box-sizing: border-box;
}
.gm-sudoku-note {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(.5rem, 2vw, .72rem);
  font-weight: 600;
  color: #a7b2c4;
  line-height: 1;
}

.gm-sudoku-shake { animation: gm-sudoku-shake .28s ease; }
@keyframes gm-sudoku-shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-3px); }
  75% { transform: translateX(3px); }
}

/* ── digit pad + tools ── */
.gm-sudoku-pad {
  display: grid;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  gap: 5px;
  width: min(100%, 520px);
  margin: 12px auto 0;
}
.gm-sudoku-digit,
.gm-sudoku-tool {
  min-width: 0;
  margin: 0;
  border: 1px solid var(--border, #1f2733);
  border-radius: var(--radius-sm, 8px);
  background: var(--card, #131822);
  color: var(--text, #edf0f5);
  font-family: var(--sans, system-ui, sans-serif);
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}
.gm-sudoku-digit {
  height: 48px;
  padding: 0;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--brand, #43d49b);
  font-variant-numeric: tabular-nums;
}
.gm-sudoku-digit.gm-sudoku-full { opacity: .35; }
.gm-sudoku-tools {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
  width: min(100%, 520px);
  margin: 8px auto 0;
}
.gm-sudoku-tool {
  height: 42px;
  padding: 0 4px;
  font-size: .9rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.gm-sudoku-tool.gm-sudoku-on {
  border-color: var(--brand, #43d49b);
  background: rgba(67, 212, 155, .14);
  color: var(--brand, #43d49b);
}
.gm-sudoku-give { color: var(--muted, #6f7c8d); }
.gm-sudoku-give.gm-sudoku-confirm { border-color: var(--err, #ef6a62); color: var(--err, #ef6a62); }
.gm-sudoku-digit:hover,
.gm-sudoku-tool:hover { border-color: #3a475a; }
.gm-sudoku-digit:active,
.gm-sudoku-tool:active { background: #1b2230; }
.gm-sudoku-digit:focus-visible,
.gm-sudoku-tool:focus-visible { outline: 2px solid var(--brand, #43d49b); outline-offset: 1px; }

.gm-sudoku-hint {
  margin: 10px 2px 0;
  font-size: .8rem;
  color: var(--muted, #6f7c8d);
  text-align: center;
}
@media (hover: none) and (pointer: coarse) { .gm-sudoku-hint { display: none; } }
@media (max-width: 380px) {
  .gm-sudoku-box { padding: 6px; }
  .gm-sudoku-digit { height: 44px; font-size: 1.15rem; }
  .gm-sudoku-pad { gap: 3px; }
  .gm-sudoku-tool { font-size: .82rem; }
}
@media (prefers-reduced-motion: reduce) { .gm-sudoku-shake { animation: none; } }