.bld-app {
  --bld-border: #d7dce2;
  --bld-ink: #172033;
  --bld-muted: #667085;
  --bld-panel: #f7f8fa;
  --bld-action: #1455d9;
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr) 260px;
  gap: 10px;
  align-items: stretch;
  color: var(--bld-ink);
  font-family: Arial, sans-serif;
  min-height: 0;
  height: min(760px, calc(100vh - 150px));
}

.bld-app * {
  box-sizing: border-box;
}

.bld-panel {
  background: var(--bld-panel);
  border: 1px solid var(--bld-border);
  border-radius: 8px;
  overflow: auto;
  padding: 10px;
}

.bld-panel h2 {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.2;
}

.bld-panel-head {
  display: grid;
  gap: 10px;
}

.bld-panel select,
.bld-panel input[type="text"],
.bld-panel input[type="number"],
.bld-panel textarea {
  width: 100%;
  border: 1px solid var(--bld-border);
  border-radius: 6px;
  padding: 8px;
  background: #fff;
  color: var(--bld-ink);
}

.bld-field,
.bld-fieldset label {
  display: grid;
  gap: 6px;
  margin-top: 8px;
  font-size: 12px;
  color: var(--bld-muted);
}

.bld-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
  margin-top: 8px;
}

.bld-row:has(button:nth-child(3)) {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.bld-requirements {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 5px;
  margin-top: 10px;
}

.bld-requirements h3 {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--bld-muted);
  font-size: 12px;
  font-weight: 700;
}

.bld-requirements button {
  min-height: 30px;
  text-align: left;
}

.bld-layers {
  display: grid;
  gap: 6px;
  margin-top: 10px;
}

.bld-layer-head {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px;
  align-items: center;
}

.bld-layer-head h3 {
  margin: 0;
  color: var(--bld-muted);
  font-size: 12px;
  font-weight: 700;
}

.bld-layer-head div {
  display: flex;
  gap: 4px;
}

.bld-layer-head button {
  min-height: 28px;
  padding-inline: 7px;
}

.bld-layer-list {
  display: grid;
  gap: 4px;
  max-height: 112px;
  overflow: auto;
}

.bld-layer-list button {
  min-height: 28px;
  overflow: hidden;
  text-align: left;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.bld-layer-list button.is-selected {
  border-color: var(--bld-action);
  background: #eef4ff;
}

.bld-app button,
.bld-app a[data-bld-download] {
  min-height: 32px;
  border: 1px solid var(--bld-border);
  border-radius: 6px;
  padding: 6px 8px;
  background: #fff;
  color: var(--bld-ink);
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  font-size: 13px;
}

.bld-app button:hover,
.bld-app a[data-bld-download]:hover {
  border-color: #9aa7b8;
}

.bld-app .bld-primary {
  width: 100%;
  margin-top: 14px;
  border-color: var(--bld-action);
  background: var(--bld-action);
  color: #fff;
}

.bld-export button:not(.bld-primary),
.bld-export a[data-bld-download] {
  display: block;
  width: 100%;
  margin-top: 8px;
}

.bld-fieldset {
  margin: 10px 0 0;
  padding: 9px;
  border: 1px solid var(--bld-border);
  border-radius: 8px;
}

.bld-fieldset legend {
  padding: 0 4px;
  color: var(--bld-muted);
  font-size: 13px;
}

.bld-stage-wrap {
  min-width: 0;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 8px;
  min-height: 0;
}

.bld-ruler,
.bld-status {
  min-height: 34px;
  display: flex;
  align-items: center;
  padding: 8px 10px;
  border: 1px solid var(--bld-border);
  border-radius: 8px;
  background: #fff;
  color: var(--bld-muted);
  font-size: 13px;
}

.bld-stage {
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--bld-border);
  border-radius: 8px;
  background: #f7f1e6;
  min-height: 0;
}

.bld-stage canvas {
  display: block;
  max-width: none;
  background: #f7f1e6;
  box-shadow: none;
  cursor: default;
}

.bld-checks {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.bld-checks label {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 8px;
  align-items: start;
  font-size: 12px;
  line-height: 1.25;
}

.bld-note {
  margin-top: 12px;
  padding: 10px;
  border-left: 4px solid #d68b00;
  background: #fff7e6;
  color: #5d4100;
  font-size: 13px;
  line-height: 1.35;
}

.bld-export pre {
  white-space: pre-wrap;
  min-height: 46px;
  margin: 10px 0 0;
  color: var(--bld-muted);
  font-size: 12px;
}

@media (max-width: 1320px) {
  .bld-app {
    grid-template-columns: 230px minmax(0, 1fr) 250px;
  }

  .bld-requirements,
  .bld-checks {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 980px) {
  .bld-app {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .bld-requirements,
  .bld-checks {
    grid-template-columns: 1fr;
  }

  .bld-stage {
    min-height: 440px;
  }
}