/* Sudoku (domain Sudoku, docs PLAN.md): the grids of the day, the grid and its pad. Prefixed classes, colours from the
   tokens of neurostim.css only. */
.sd-day { font-size: var(--ns-size-lg); font-weight: 400; }
.sd-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr)); gap: var(--ns-space-4); margin: 0 0 var(--ns-space-5); }
.sd-card { display: flex; flex-direction: column; gap: var(--ns-space-2); }
.sd-card h2 { margin: 0; }
.sd-card p, .sd-card form { margin: 0; }
.sd-time { font-size: var(--ns-size-2xl); font-weight: 700; font-variant-numeric: tabular-nums; color: var(--ns-text-strong); }
.sd-boards { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 26rem), 1fr)); gap: 0 var(--ns-space-5); }
.sd-rules { margin-top: var(--ns-space-6); }
.sd-clock { margin: 0 0 var(--ns-space-3); text-align: center; font-size: var(--ns-size-xl); font-weight: 700; font-variant-numeric: tabular-nums; }

.sd-grid { width: min(100%, 30rem); margin: 0 auto var(--ns-space-4); table-layout: fixed; border-collapse: collapse; border: 3px solid var(--ns-ink); }
.sd-grid td { position: relative; padding: 0; text-align: center; border: 1px solid var(--ns-border-strong); background: var(--ns-page); }
.sd-grid td:nth-child(3n) { border-right: 3px solid var(--ns-ink); }
.sd-grid tr:nth-child(3n) td { border-bottom: 3px solid var(--ns-ink); }
.sd-grid td > span, .sd-grid input { display: flex; align-items: center; justify-content: center; width: 100%; aspect-ratio: 1; font-size: clamp(1.1rem, 5.5vw, 1.75rem); font-variant-numeric: tabular-nums; }
.sd-grid input { min-height: 0; margin: 0; padding: 0; text-align: center; font-family: inherit; color: var(--ns-accent-darker); caret-color: transparent; background: transparent; border: 0; border-radius: 0; }
.sd-grid input:focus-visible { outline: 3px solid var(--ns-focus); outline-offset: -3px; }
.sd-given { font-weight: 700; color: var(--ns-ink); }
.sd-grid .sd-given { background: var(--ns-tint); }
.sd-grid .sd-peer { background: var(--ns-accent-soft); }
.sd-grid .sd-same { background: var(--ns-accent-light); }
.sd-grid .sd-bad, .sd-grid .sd-bad input { color: var(--ns-error); background: var(--ns-error-soft); }
.sd-notes { position: absolute; inset: 2px; display: grid; grid-template-columns: repeat(3, 1fr); font-size: clamp(0.5rem, 2vw, 0.7rem); line-height: 1; color: var(--ns-muted); pointer-events: none; }
.sd-notes span { display: flex; align-items: center; justify-content: center; }
.sd-actions { display: flex; flex-wrap: wrap; gap: var(--ns-space-3); justify-content: center; }
.sd-pad { display: grid; grid-template-columns: repeat(5, 1fr); gap: var(--ns-space-2); width: min(100%, 30rem); margin: 0 auto var(--ns-space-4); }
.sd-pad button { min-height: var(--ns-target); padding: 0; font-size: var(--ns-size-lg); font-variant-numeric: tabular-nums; }
.sd-form .sd-on { color: var(--ns-on-accent); background: var(--ns-accent-dark); border-color: var(--ns-accent-dark); }