body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  overflow-x: auto;
  overflow-y: auto;
}

.multi-wrap {
  width: 100%;
  display: flex;
  flex-direction: column;
  /* 多字网格宽于视口时从左缘起算，避免居中导致滚不到最左 */
  align-items: flex-start;
  justify-content: flex-start;
  margin-top: auto;
  margin-bottom: auto;
  --writer-cell-size: 160px;
  --writer-cell-gap: 8px;
  --writer-cell-border-radius: 8px;
  --writer-cell-border-color: var(--border-color);
  --writer-cell-cursor: pointer;
  --multi-cols: 1;
}

.multi-grid {
  display: grid;
  grid-template-columns: repeat(var(--multi-cols, 1), var(--writer-cell-size));
  grid-auto-rows: var(--writer-cell-size);
  gap: var(--writer-cell-gap);
  padding: 0;
  width: calc(
    var(--multi-cols, 1) * var(--writer-cell-size) +
      (var(--multi-cols, 1) - 1) * var(--writer-cell-gap)
  );
  margin-inline: auto;
  height: auto;
}

.writer-target {
  background: var(--bg-color);
  width: var(--writer-cell-size);
  height: var(--writer-cell-size);
  box-sizing: border-box;
  border-radius: var(--writer-cell-border-radius);
  border: 1px solid var(--writer-cell-border-color);
  cursor: var(--writer-cell-cursor);
  flex: 0 0 auto;
}

.multi-wrap.is-practice {
  --writer-cell-cursor: default;
}

.practice-controls {
  margin-top: 20px;
  width: 100%;
  display: flex;
  gap: 12px;
  justify-content: center;
}

.err {
  padding: 10px;
  font-size: var(--ui-font-size);
  color: var(--danger);
  line-height: 1.4;
}