.paper1-filters {
  margin: 0 0 22px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #f8f9fa;
}

.paper1-filter-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.paper1-filter-heading div {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.paper1-filter-heading span {
  color: var(--muted);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 1.3px;
}

.paper1-filter-heading strong { font-size: 13px; }

.paper1-filter-heading button {
  border: 0;
  background: transparent;
  color: var(--ink);
  font-size: 12px;
  font-weight: 800;
  text-decoration: underline;
}

.paper1-filter-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.paper1-filter-grid label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
}

.paper1-filter-grid select {
  width: 100%;
  min-width: 0;
  padding: 11px 34px 11px 11px;
  border: 1px solid #cfd5da;
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font-size: 13px;
}

.paper1-filter-empty button { margin-top: 4px; }

.number-pattern-hero { margin-bottom: 24px; }

.number-pattern-subtopic-grid { counter-reset: number-pattern-subtopic; }

.number-pattern-subtopic-grid .choice {
  counter-increment: number-pattern-subtopic;
  min-height: 164px;
}

.number-pattern-subtopic-grid .choice::before {
  content: counter(number-pattern-subtopic, decimal-leading-zero);
  display: block;
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 1.4px;
}

.number-pattern-subtopic-grid .choice:first-child {
  border-color: var(--ink);
  background: var(--ink);
  color: #fff;
}

.number-pattern-subtopic-grid .choice:first-child small,
.number-pattern-subtopic-grid .choice:first-child::before,
.number-pattern-subtopic-grid .choice:first-child .arrow {
  color: #d8dde2;
}

@media (max-width: 620px) {
  .paper1-filters { padding: 14px; }
  .paper1-filter-grid { grid-template-columns: 1fr; }
  .paper1-filter-heading { align-items: flex-start; }
  .paper1-filter-heading div { display: grid; gap: 4px; }
}