.sdk { max-width: 500px; margin: 0 auto; }
.sdk .g-bar { justify-content: flex-start; }
.sdk-board {
  display: grid; grid-template-columns: repeat(9, 1fr); aspect-ratio: 1 / 1; width: 100%;
  border: 2px solid var(--ink); border-radius: 8px; overflow: hidden; background: var(--cell);
  user-select: none; -webkit-user-select: none; touch-action: manipulation;
}
.sdk-cell {
  display: flex; align-items: center; justify-content: center; position: relative;
  border-right: 1px solid var(--line); border-bottom: 1px solid var(--line);
  font-size: clamp(17px, 5.6vw, 28px); font-weight: 500; line-height: 1; cursor: pointer;
  color: var(--accent-2); background: var(--cell); font-variant-numeric: tabular-nums;
  transition: background-color .08s;
}
.sdk-cell:nth-child(9n) { border-right: 0; }
.sdk-cell:nth-child(n+73) { border-bottom: 0; }
.sdk-cell.sdk-br { border-right: 2px solid var(--ink); }
.sdk-cell.sdk-bb { border-bottom: 2px solid var(--ink); }
.sdk-cell.sdk-given { color: var(--ink); font-weight: 700; }
.sdk-cell.sdk-peer { background: var(--cell-alt); }
.sdk-cell.sdk-same { background: color-mix(in srgb, var(--accent-2) 22%, var(--cell)); }
.sdk-cell.sdk-sel { background: color-mix(in srgb, var(--accent) 26%, var(--cell)); }
.sdk-cell.sdk-err { color: var(--bad); background: color-mix(in srgb, var(--bad) 13%, var(--cell)); }
.sdk-cell.sdk-err.sdk-sel { background: color-mix(in srgb, var(--bad) 24%, var(--cell)); }
.sdk-notes { position: absolute; inset: 2px; display: grid; grid-template-columns: repeat(3, 1fr); grid-template-rows: repeat(3, 1fr); }
.sdk-notes span { display: flex; align-items: center; justify-content: center; font-size: clamp(8px, 2.3vw, 12px); color: var(--muted); font-weight: 600; }
.sdk-notes .sdk-note-hl { color: var(--accent); font-weight: 800; }
.sdk-pad { display: grid; grid-template-columns: repeat(9, 1fr); gap: 5px; margin-top: 12px; }
.sdk-num {
  font: inherit; border: 1px solid var(--line); background: var(--cell); color: var(--ink); border-radius: 10px;
  padding: 6px 0 4px; cursor: pointer; display: flex; flex-direction: column; align-items: center; min-height: 48px;
  touch-action: manipulation;
}
.sdk-num:hover { border-color: var(--accent); }
.sdk-num:active { background: var(--cell-alt); }
.sdk-num-d { font-size: clamp(18px, 5vw, 24px); font-weight: 700; line-height: 1.1; }
.sdk-num-c { font-size: 11px; color: var(--muted); min-height: 13px; }
.sdk-num-done { opacity: .35; }
.sdk-tools { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; margin-top: 8px; }
.sdk-tools .g-btn { padding: 8px 4px; font-size: 14px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
@media (max-width: 380px) { .sdk-tools .g-btn { font-size: 12.5px; } .sdk-pad { gap: 3px; } }