.sudoku-shell {
  width: min(1120px, 100%);
}

.sudoku-mode-group {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}

.sudoku-mode-btn,
.sudoku-tool-grid button,
.sudoku-number-pad button,
.sudoku-finish-card button,
.sudoku-links a {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  font-weight: 800;
  text-decoration: none;
  transition:
    border-color 0.18s,
    background 0.18s,
    color 0.18s;
}

.sudoku-mode-btn:hover,
.sudoku-mode-btn:focus-visible,
.sudoku-tool-grid button:hover,
.sudoku-tool-grid button:focus-visible,
.sudoku-number-pad button:hover,
.sudoku-number-pad button:focus-visible,
.sudoku-finish-card button:hover,
.sudoku-finish-card button:focus-visible,
.sudoku-links a:hover,
.sudoku-links a:focus-visible,
.sudoku-cell:focus-visible {
  border-color: #2f6f9f;
  outline: none;
}

.sudoku-mode-btn.active,
.sudoku-tool-grid button.active,
.sudoku-tool-grid button.primary,
.sudoku-finish-card button {
  color: #fff;
  background: #2f6f9f;
  border-color: #2f6f9f;
}

.sudoku-tool-grid button:disabled {
  cursor: not-allowed;
  color: #98a2b3;
  background: #eef2f7;
  border-color: #e2e8f0;
}

.sudoku-score-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}

.sudoku-score-grid div {
  min-height: 68px;
  display: grid;
  align-content: center;
  gap: 4px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #101828;
  color: #fff;
}

.sudoku-score-grid span {
  color: rgba(255, 255, 255, 0.62);
  font-size: 12px;
  font-weight: 800;
}

.sudoku-score-grid strong {
  overflow: hidden;
  color: #80d6ff;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 22px;
  line-height: 1.1;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sudoku-layout {
  display: grid;
  grid-template-columns: minmax(320px, 1fr) 260px;
  gap: 16px;
  align-items: start;
}

.sudoku-board-panel,
.sudoku-side-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.sudoku-board-panel {
  position: relative;
  display: grid;
  place-items: center;
  padding: 14px;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(47, 111, 159, 0.055) 1px, transparent 1px),
    linear-gradient(rgba(47, 111, 159, 0.055) 1px, transparent 1px), #edf2f8;
  background-size: 18px 18px;
}

.sudoku-board {
  width: min(620px, 100%);
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  grid-template-rows: repeat(9, 1fr);
  border: 3px solid #20557d;
  background: #20557d;
}

.sudoku-cell {
  position: relative;
  min-width: 0;
  min-height: 0;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid #c7d7e7;
  background: #fff;
  color: #20557d;
  font-size: clamp(22px, 5.6vw, 40px);
  font-weight: 900;
  line-height: 1;
  cursor: pointer;
}

.sudoku-cell:nth-child(3n) {
  border-right: 2px solid #20557d;
}

.sudoku-cell:nth-child(n + 19):nth-child(-n + 27),
.sudoku-cell:nth-child(n + 46):nth-child(-n + 54) {
  border-bottom: 2px solid #20557d;
}

.sudoku-cell.fixed {
  color: #172033;
  background: #f3f6fb;
}

.sudoku-cell.related {
  background: #eef6fd;
}

.sudoku-cell.same {
  background: #dbeefe;
}

.sudoku-cell.wrong {
  color: #c2410c;
  background: #fff1f2;
}

.sudoku-cell.selected {
  z-index: 1;
  background: #cfe6f7;
  box-shadow: inset 0 0 0 3px #2f6f9f;
}

.sudoku-cell.selected.wrong {
  background: #ffe2e5;
  box-shadow: inset 0 0 0 3px #dc2626;
}

.sudoku-notes {
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  align-items: center;
  justify-items: center;
  color: #61758d;
  font-size: clamp(8px, 1.3vw, 14px);
  font-weight: 800;
}

.sudoku-finish-overlay {
  position: absolute;
  inset: 14px;
  display: grid;
  place-items: center;
  padding: 20px;
  border-radius: 8px;
  background: rgba(16, 24, 40, 0.62);
  z-index: 20;
}

.sudoku-finish-overlay[hidden] {
  display: none;
}

.sudoku-finish-card {
  width: min(320px, 100%);
  display: grid;
  gap: 10px;
  padding: 22px;
  border-radius: 8px;
  background: #fff;
  text-align: center;
  box-shadow: var(--shadow);
}

.sudoku-finish-card strong {
  font-size: 24px;
  line-height: 1.2;
}

.sudoku-finish-card span {
  color: var(--muted);
}

.sudoku-side-panel {
  display: grid;
  gap: 12px;
  padding: 14px;
}

.sudoku-status-card {
  min-height: 74px;
  display: grid;
  align-content: center;
  gap: 4px;
  padding: 12px;
  border-radius: 8px;
  background: #f8fafc;
  border: 1px solid var(--line);
}

.sudoku-status-card span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.sudoku-status-card strong {
  overflow-wrap: anywhere;
  font-size: 17px;
  line-height: 1.3;
}

.sudoku-tool-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.sudoku-number-pad {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.sudoku-number-pad button {
  min-height: 54px;
  font-size: 22px;
  color: #20557d;
}

.sudoku-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

@media (max-width: 800px) {
  .sudoku-layout {
    grid-template-columns: 1fr;
  }

  .sudoku-side-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sudoku-status-card,
  .sudoku-links {
    grid-column: 1 / -1;
  }
}

@media (max-width: 700px) {
  .sudoku-mode-group {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
    width: 100%;
  }

  .sudoku-mode-btn {
    min-height: 34px;
    padding: 0 8px;
    font-size: 13px;
  }

  .sudoku-score-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 6px;
    margin-bottom: 8px;
  }

  .sudoku-score-grid div {
    min-height: 54px;
    gap: 2px;
    padding: 8px;
    border-radius: 7px;
  }

  .sudoku-score-grid span {
    font-size: 11px;
  }

  .sudoku-score-grid strong {
    font-size: 18px;
  }

  .sudoku-layout {
    gap: 8px;
  }

  .sudoku-board-panel,
  .sudoku-side-panel {
    padding: 8px;
    border-radius: 7px;
  }

  .sudoku-cell {
    font-size: clamp(18px, 7vw, 28px);
  }

  .sudoku-notes {
    font-size: clamp(7px, 2vw, 10px);
  }

  .sudoku-finish-overlay {
    inset: 8px;
    padding: 14px;
  }

  .sudoku-finish-card {
    padding: 16px;
    border-radius: 7px;
  }

  .sudoku-finish-card strong {
    font-size: 22px;
  }

  .sudoku-side-panel {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .sudoku-status-card {
    min-height: 46px;
    gap: 2px;
    padding: 8px;
    border-radius: 7px;
  }

  .sudoku-status-card span {
    display: none;
  }

  .sudoku-status-card strong {
    font-size: 13px;
  }

  .sudoku-tool-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
  }

  .sudoku-tool-grid button {
    min-height: 36px;
    padding: 0 6px;
    font-size: 13px;
  }

  .sudoku-number-pad {
    grid-template-columns: repeat(9, minmax(0, 1fr));
    gap: 4px;
  }

  .sudoku-number-pad button {
    min-height: 38px;
    padding: 0;
    font-size: 17px;
  }

  .sudoku-links {
    gap: 6px;
  }

  .sudoku-links a {
    min-height: 34px;
    padding: 0 8px;
    font-size: 13px;
  }
}