.builder { position: fixed; inset: 0; display: grid; grid-template-columns: 1fr 340px; }
.builder__view { position: relative; overflow: hidden; }
.builder__panel {
  overflow: auto; padding: 16px; background: #fff; border-left: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 12px;
}
.builder fieldset { border: 1px solid var(--line); border-radius: 10px; padding: 8px 12px 10px; margin: 0; }
.builder legend { font-weight: 600; padding: 0 4px; }
.field { display: grid; grid-template-columns: 1fr auto; gap: 2px 8px; align-items: center; margin-top: 6px; }
.field > span { color: var(--quiet); font-size: 12px; }
.field output { font-variant-numeric: tabular-nums; font-size: 12px; text-align: right; }
.field input[type='range'] { grid-column: 1 / -1; width: 100%; accent-color: var(--blue); }
.field select { grid-column: 1 / -1; font: inherit; padding: 4px 6px; border-radius: 6px; border: 1px solid var(--line); }
.field--wide select { font-weight: 600; }
.field--check { display: flex; gap: 8px; }
.colours { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }
.colours input { width: 44px; height: 28px; border: 0; background: none; }
.builder__actions { display: flex; flex-wrap: wrap; gap: 8px; }
.builder button {
  font: inherit; font-weight: 600; padding: 7px 12px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--blue); background: var(--blue); color: #fff;
}
.builder button.secondary { background: #fff; color: var(--blue); }
.builder button:focus-visible, .builder select:focus-visible, .builder input:focus-visible { outline: 2px solid var(--orange); outline-offset: 2px; }
.builder__note { margin: 0; color: var(--quiet); min-height: 1.4em; }
@media (max-width: 760px) {
  .builder { grid-template-columns: 1fr; grid-template-rows: 55vh 1fr; }
  .builder__panel { border-left: 0; border-top: 1px solid var(--line); }
}