/* Shared 2D virtual grid styles. Teacher journal is the primary consumer. */

.lk-virtual-scroll {
  overflow: auto;
  position: relative;
  background: var(--t-canvas, #FFFFFF);
  -webkit-overflow-scrolling: touch;
  contain: strict;
}

.lk-virtual-canvas {
  position: relative;
}

.lk-virtual-cell {
  position: absolute;
  top: 0;
  left: 0;
  box-sizing: border-box;
  border-right: 1px solid var(--t-hair, #E0E0E0);
  border-bottom: 1px solid var(--t-hair, #E0E0E0);
  padding: 5px 7px;
  font-family: var(--t-font-body, 'Golos Text', -apple-system, sans-serif);
  font-size: var(--t-fs-table, 12px);
  line-height: 1.25;
  color: var(--t-ink, #1A1A1A);
  background: var(--t-canvas, #FFFFFF);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  contain: layout paint;
  will-change: transform;
}

.lk-virtual-cell--sticky-row {
  background: var(--t-canvas-2, #F4F4F4);
  border-bottom-width: 2px;
  border-bottom-color: var(--t-hair-strong, #C8C8C8);
  font-family: var(--t-font-mono, ui-monospace, monospace);
  font-weight: 600;
  font-size: var(--t-fs-label, 10.5px);
  text-transform: uppercase;
  letter-spacing: var(--t-ls-label, 0.06em);
  color: var(--t-ink-mute, #6B6B6B);
}

.lk-virtual-cell--sticky-col {
  background: var(--t-canvas, #FFFFFF);
  border-right-width: 2px;
  border-right-color: var(--t-hair-strong, #C8C8C8);
  font-weight: 500;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.lk-virtual-cell--sticky-last-col {
  background: var(--t-canvas-2, #F4F4F4);
  border-left: 2px solid var(--t-hair-strong, #C8C8C8);
  border-right: 1px solid var(--t-hair, #E0E0E0);
  box-shadow: -8px 0 12px rgba(31, 52, 97, 0.04);
  font-family: var(--t-font-mono, ui-monospace, monospace);
  font-weight: 600;
}

.lk-virtual-cell--corner {
  background: var(--t-canvas-3, #ECECEC);
  border-right-width: 2px;
  border-right-color: var(--t-hair-strong, #C8C8C8);
  border-bottom-width: 2px;
  border-bottom-color: var(--t-hair-strong, #C8C8C8);
  color: var(--t-accent, #1F3461);
  font-weight: 700;
}

.lk-virtual-cell:focus,
.lk-virtual-cell:focus-visible {
  outline: 2px solid var(--t-accent, #1F3461);
  outline-offset: -2px;
  z-index: 6;
}

@media (hover: hover) {
  .lk-virtual-cell:hover:not(.lk-virtual-cell--sticky-row):not(.lk-virtual-cell--sticky-col):not(.lk-virtual-cell--sticky-last-col):not(.lk-virtual-cell--corner) {
    background: var(--t-canvas-2, #F4F4F4);
  }
}

.lk-virtual-cell.grade-5 { background: var(--t-ok-bg, #E2F0E5); color: var(--t-ok, #137333); font-weight: 600; }
.lk-virtual-cell.grade-4 { background: #EAF1E8; color: #2E6B3F; }
.lk-virtual-cell.grade-3 { background: var(--t-warn-bg, #FBF1DD); color: var(--t-warn, #B7800E); }
.lk-virtual-cell.grade-2 { background: var(--t-bad-bg, #FBEAE7); color: var(--t-bad, #B0301C); font-weight: 600; }
.lk-virtual-cell.grade-N { background: var(--t-canvas-3, #ECECEC); color: var(--t-ink-faint, #9C9C9C); }
.lk-virtual-cell.grade-B { background: var(--t-info-bg, #E6ECF5); color: var(--t-info, #1F3461); }
.lk-virtual-cell.grade-U { background: var(--t-warn-bg, #FBF1DD); color: var(--t-warn, #B7800E); }

.lk-virtual-cell.cell-pending {
  border: 1px dashed var(--t-warn, #B7800E);
}

.lk-virtual-cell.cell-conflict {
  border: 1px solid var(--t-bad, #B0301C);
}

@media (max-width: 768px) {
  .lk-virtual-cell {
    font-size: 12px;
    padding: 4px 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .lk-virtual-cell {
    transition: none !important;
  }
}