.help-card {
  margin-top: 0;
}

.help-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.help-grid div {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px;
  background: var(--surface-soft);
}

.help-grid h3 {
  margin: 0 0 8px;
  font-size: 0.96rem;
  letter-spacing: -0.01em;
}

.help-grid p {
  margin: 0;
  color: var(--muted);
  line-height: 1.48;
  font-size: 0.92rem;
}

.terminology-card {
  grid-column: 1 / -1;
}

.terminology-board {
  display: grid;
  grid-template-columns: minmax(28px, auto) repeat(9, minmax(24px, 1fr));
  gap: 2px;
  max-width: 520px;
  margin-top: 0.7rem;
  font-size: 0.76rem;
  color: var(--text);
}

.term-corner,
.term-col-label,
.term-row-label,
.term-cell {
  min-height: 24px;
  display: grid;
  place-items: center;
  border-radius: 7px;
}

.term-col-label,
.term-row-label {
  font-weight: 800;
  color: var(--muted);
  background: rgba(15, 23, 42, 0.05);
}

.term-cell {
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(15, 23, 42, 0.08);
  font-weight: 700;
  color: rgba(15, 23, 42, 0.7);
}

.term-box-1,
.term-box-3,
.term-box-5,
.term-box-7,
.term-box-9 {
  background: rgba(37, 99, 235, 0.06);
}

.term-box-2,
.term-box-4,
.term-box-6,
.term-box-8 {
  background: rgba(245, 158, 11, 0.08);
}

.term-cell.is-box-label {
  color: var(--brand-deep);
  border-color: rgba(37, 99, 235, 0.2);
}

.term-cell.is-example-cell {
  color: var(--danger);
  border-color: rgba(220, 38, 38, 0.35);
  box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.1) inset;
  background: rgba(254, 242, 242, 0.95);
}

.assist-help-card {
  grid-column: span 2;
}

.assist-help-card p + p {
  margin-top: 8px;
}

.assist-example-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.assist-example {
  display: grid;
  gap: 8px;
  min-width: 0;
}

.assist-example-title {
  color: var(--ink);
  font-size: 0.8rem;
  font-weight: 850;
  line-height: 1.25;
}

.assist-mini-board {
  display: grid;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  gap: 1px;
  width: min(100%, 190px);
  aspect-ratio: 1;
  border: 2px solid var(--line-strong);
  background: var(--line-strong);
  border-radius: 10px;
  overflow: hidden;
}

.assist-mini-board span {
  position: relative;
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 0;
  background: var(--surface);
  color: var(--ink);
  font-size: 0.64rem;
  font-weight: 900;
}

.assist-mini-board span:nth-child(3n) {
  border-right: 2px solid var(--line-strong);
}

.assist-mini-board span:nth-child(9n) {
  border-right: 0;
}

.assist-mini-board span:nth-child(n + 19):nth-child(-n + 27),
.assist-mini-board span:nth-child(n + 46):nth-child(-n + 54) {
  border-bottom: 2px solid var(--line-strong);
}

.assist-mini-board span:nth-child(n + 73) {
  border-bottom: 0;
}

.assist-mini-board .is-blue {
  background-image: repeating-linear-gradient(135deg, var(--assist-line) 0, var(--assist-line) 5px, transparent 5px, transparent 10px);
}

.assist-mini-board .is-yellow {
  background-image: repeating-linear-gradient(135deg, var(--value-line) 0, var(--value-line) 5px, transparent 5px, transparent 10px);
}

.assist-mini-board .is-selected {
  box-shadow: inset 0 0 0 3px var(--accent);
  background-color: var(--surface);
}

.assist-mini-board .is-red::after {
  content: '';
  position: absolute;
  inset: 4px;
  border: 2px solid var(--bad-ink);
  border-radius: 999px;
}