.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}

.legend-item {
  font-size: 0.68rem;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: 12px;
  background: var(--cat-color, #ccc);
  color: var(--text-primary);
  text-transform: capitalize;
  cursor: default;
  user-select: none;
}

.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 8px;
}

.periodic-table {
  display: grid;
  grid-template-columns: repeat(18, 56px);
  /* rows 1-7: main periods; row 8: 20px spacer; rows 9-10: f-block */
  grid-template-rows: repeat(7, 64px) 20px repeat(2, 64px);
  gap: 3px;
  min-width: 1059px;
}

.element-cell {
  background: var(--cat-color, #ccc);
  background: color-mix(in srgb, var(--cat-color, #ccc) 22%, rgba(255, 255, 255, 0.65));
  border: 1px solid var(--cell-border);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
  box-shadow: var(--cell-shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4px 2px;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  position: relative;
  overflow: hidden;
}

.element-cell::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--cat-color, #ccc);
  border-radius: var(--radius) 0 0 var(--radius);
}

.element-cell:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: var(--cell-hover-shadow);
  z-index: 10;
}

.element-cell:focus-visible {
  outline: 2px solid rgba(99, 120, 200, 0.8);
  outline-offset: 1px;
  z-index: 10;
}

.element-cell.dimmed {
  opacity: 0.15;
  pointer-events: none;
}

.el-number {
  font-size: 0.58rem;
  color: var(--text-muted);
  align-self: flex-start;
  padding-left: 5px;
  line-height: 1;
}

.el-symbol {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.1;
}

.el-name {
  font-size: 0.52rem;
  color: var(--text-secondary);
  text-align: center;
  line-height: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 52px;
}

@media (max-width: 900px) {
  .periodic-table {
    grid-template-columns: repeat(18, 48px);
    grid-template-rows: repeat(7, 56px) 16px repeat(2, 56px);
    min-width: 900px;
  }
  .el-symbol { font-size: 1.1rem; }
  .el-name   { font-size: 0.48rem; max-width: 44px; }
}

@media (max-width: 1100px) {
  .table-wrapper::after {
    content: '\2190 scroll \2192';
    display: block;
    text-align: center;
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 6px;
    letter-spacing: 0.05em;
  }
}