.studio-grid {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr) 340px;
  gap: 16px;
  padding: 18px;
  max-width: 1400px;
  margin: 0 auto;
  align-items: start;
}
@media (max-width: 1100px) {
  .studio-grid { grid-template-columns: 1fr; }
}

.palette, .preview, .canvas {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card);
  padding: 14px;
  box-shadow: var(--shadow);
}
.palette h2, .preview h2 { font-size: 12px; margin: 0 0 10px; color: var(--txt2); display: flex; justify-content: space-between; }
.palette h2 span, .preview h2 span { color: var(--txt3); font-weight: 400; }

.palette-list { display: flex; flex-direction: column; gap: 4px; max-height: 70vh; overflow-y: auto; }
.pal-item {
  display: flex; align-items: center; gap: 8px; padding: 7px 8px; border-radius: 8px;
  border: 1px solid transparent; cursor: pointer; background: none; text-align: left; width: 100%;
  color: var(--txt2); font-size: 12px;
}
.pal-item:hover { background: var(--inset); border-color: var(--line); color: var(--txt); }
.pal-item b { display: block; font-size: 12px; font-weight: 550; color: var(--txt); }
.pal-item em { font-style: normal; font-size: 9.5px; color: var(--txt3); font-family: var(--mono, monospace); }
.pal-item .plus { margin-left: auto; color: var(--accent2); }

.canvas-head { display: flex; align-items: baseline; gap: 10px; margin-bottom: 12px; }
.canvas-head h1 { font-size: 18px; margin: 0; }
.canvas-head span { font-size: 11.5px; color: var(--txt3); flex: 1; }

.nodes { display: flex; flex-direction: column; gap: 8px; }
.node-card {
  border: 1px solid var(--line); border-radius: 11px; padding: 10px 12px;
  background: var(--surface); position: relative;
}
.node-card.bypass { opacity: 0.55; border-style: dashed; }
.node-card .nhead { display: flex; align-items: center; gap: 8px; }
.node-card .nhead b { font-size: 12.5px; }
.node-card .nhead em { font-style: normal; font-size: 9.5px; color: var(--txt3); font-family: var(--mono, monospace); }
.node-card .nhead .spacer { flex: 1; }
.node-card .mini {
  font-size: 10.5px; padding: 3px 8px; border-radius: 6px; border: 1px solid var(--line2);
  background: none; color: var(--txt3); cursor: pointer;
}
.node-card .mini:hover { color: var(--txt); border-color: var(--txt3); }
.node-card .mini.danger:hover { color: var(--danger); border-color: var(--danger); }
.ports { display: flex; gap: 16px; margin-top: 7px; font-size: 10.5px; color: var(--txt3); flex-wrap: wrap; }
.ports span b { color: var(--txt2); font-weight: 500; }
.ports .off { color: var(--warn); }

.empty { color: var(--txt3); font-size: 12px; text-align: center; padding: 26px 8px; }
.problems { margin-top: 12px; display: flex; flex-direction: column; gap: 6px; }
.problem {
  font-size: 11px; padding: 7px 10px; border-radius: 8px;
  border: 1px solid color-mix(in srgb, var(--warn) 40%, transparent);
  background: color-mix(in srgb, var(--warn) 8%, transparent); color: var(--warn);
}
.problem.err {
  border-color: color-mix(in srgb, var(--danger) 45%, transparent);
  background: color-mix(in srgb, var(--danger) 8%, transparent); color: var(--danger);
}

.preview { position: sticky; top: 74px; }
.pv-section { border-top: 1px dashed var(--line); padding: 10px 0; }
.pv-section:first-child { border-top: 0; }
.pv-section h3 { font-size: 12px; margin: 0 0 6px; }
.pv-field { display: flex; justify-content: space-between; gap: 10px; font-size: 11.5px; padding: 3px 0; color: var(--txt2); }
.pv-field b { color: var(--txt); font-weight: 500; font-variant-numeric: tabular-nums; }
.pv-field .lock { font-size: 9px; color: var(--txt3); border: 1px solid var(--line2); border-radius: 4px; padding: 0 4px; }
.preview .hint { font-size: 10.5px; color: var(--txt3); margin: 12px 0 0; line-height: 1.7; }

.revisions { margin-top: 16px; border-top: 1px solid var(--line); padding-top: 12px; }
.revisions h2 { font-size: 12px; margin: 0 0 8px; color: var(--txt2); display: flex; justify-content: space-between; }
.rev-item {
  display: flex; align-items: center; gap: 8px; padding: 7px 0;
  border-top: 1px dashed var(--line); font-size: 11.5px;
}
.rev-item:first-child { border-top: 0; }
.rev-item .tag { font-size: 9.5px; border: 1px solid var(--line2); border-radius: 4px; padding: 0 5px; color: var(--txt3); }
.rev-item .tag.cur { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, transparent); }
.rev-item .note { flex: 1; color: var(--txt2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.rev-item .when { color: var(--txt3); font-variant-numeric: tabular-nums; }
.rev-item button {
  font-size: 10.5px; padding: 2px 8px; border-radius: 5px; border: 1px solid var(--line2);
  background: none; color: var(--txt3); cursor: pointer;
}
.rev-item button:hover { color: var(--txt); border-color: var(--txt3); }

.diff { margin-top: 10px; font-size: 11px; color: var(--txt2); }
.diff .dhead { display: flex; justify-content: space-between; margin-bottom: 6px; color: var(--txt3); }
.diff .drow { display: flex; gap: 6px; padding: 3px 0; border-top: 1px dashed var(--line); }
.diff .drow:first-of-type { border-top: 0; }
.diff .drow .k { width: 42px; color: var(--txt3); flex: none; }
.diff .drow .v { flex: 1; word-break: break-all; }
.diff .plus { color: var(--ok); }
.diff .minus { color: var(--danger); }
.diff .mod { color: var(--warn); }