.sudoku-page {
  min-height: 100dvh;
  padding: 18px;
  background: #050505;
  color: var(--text-primary);
  position: relative;
  z-index: 1;
}

.sudoku-page::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.sudoku-header,
.sudoku-layout {
  position: relative;
  z-index: 1;
}

.sudoku-header {
  width: min(1180px, 100%);
  margin: 0 auto 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sudoku-title {
  font-size: 1.5rem;
  letter-spacing: -0.05em;
}

.sudoku-subtitle {
  color: var(--text-muted);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
}

.sudoku-layout {
  min-height: calc(100dvh - 96px);
  display: grid;
  grid-template-columns: minmax(170px, 235px) minmax(340px, 540px) minmax(250px, 370px);
  gap: clamp(10px, 1.15vw, 18px);
  justify-content: center;
  align-items: center;
}

.sudoku-panel,
.sudoku-stage {
  background: rgba(5, 5, 5, 0.86);
}

.sudoku-panel {
  height: min(540px, calc(100dvh - 116px));
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow: hidden;
}

.sudoku-panel h2 {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.sudoku-difficulty-list {
  display: grid;
  gap: 7px;
}

.sudoku-difficulty {
  border: 1px solid var(--surface-border);
  background: #080808;
  color: var(--text-secondary);
  padding: 10px;
  cursor: pointer;
  text-align: left;
}

.sudoku-difficulty.active {
  background: #f2f2f2;
  color: #050505;
}

.sudoku-meta {
  display: flex;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.78rem;
}

.sudoku-meta strong {
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.sudoku-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.sudoku-board {
  width: min(540px, calc(100vw - 36px));
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  border: 2px solid #252525;
  background: #050505;
}

.sudoku-cell {
  min-width: 0;
  width: 100%;
  height: 100%;
  border: 1px solid #191919;
  background: #090909;
  color: #f3f3f3;
  text-align: center;
  font: 700 clamp(1rem, 3vw, 1.7rem) var(--font-family);
  outline: none;
}

.sudoku-cell:nth-child(3n) {
  border-right-color: #393939;
}

.sudoku-cell:nth-child(n+19):nth-child(-n+27),
.sudoku-cell:nth-child(n+46):nth-child(-n+54) {
  border-bottom-color: #393939;
}

.sudoku-cell--given {
  background: #141414;
  color: #8f8f8f;
}

.sudoku-cell:focus {
  background: #180608;
  box-shadow: inset 0 0 0 2px var(--scrollbar-thumb-hover);
}

.sudoku-message {
  min-height: 38px;
  color: var(--text-muted);
  font-size: 0.8rem;
  line-height: 1.35;
}

.sudoku-message--success {
  color: #00d98b;
}

.sudoku-message--error {
  color: #ff7187;
}

.sudoku-leaderboard {
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

.sudoku-rank-row {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 3px 8px;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.72rem;
}

.sudoku-rank-row b {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sudoku-rank-row em,
.sudoku-rank-row strong {
  font-style: normal;
  font-variant-numeric: tabular-nums;
}

.sudoku-score--noob { color: #8d8d8d; }
.sudoku-score--amateur { color: #ea8d3d; }
.sudoku-score--pro { color: #416dbb; }
.sudoku-score--lunatic { color: #ad65ff; }

.sudoku-rank-row strong {
  color: #f2f2f2;
}

.sudoku-empty {
  color: var(--text-muted);
}

@media (max-width: 1280px), (max-height: 820px) {
  .sudoku-page {
    padding: 12px;
    overflow-y: auto;
  }

  .sudoku-header {
    flex-wrap: wrap;
    gap: 10px;
  }

  .sudoku-layout {
    grid-template-columns: 1fr;
    align-items: start;
    min-height: 0;
  }

  .sudoku-panel {
    height: auto;
    max-height: 320px;
    overflow-y: auto;
  }

  .sudoku-stage,
  .sudoku-panel {
    width: min(540px, calc(100vw - 24px));
    margin: 0 auto;
  }
}