:root {
  color-scheme: light;
  --surface: #fcfcfb;
  --page: #f9f9f7;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --accent: #2a78d6;
  --critical: #d03b3b;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 14px;
  color: var(--ink);
  background: var(--page);
}
* { box-sizing: border-box; }
body { margin: 0; overflow: hidden; }
#root { height: 100vh; height: 100dvh; display: flex; flex-direction: column; overflow: hidden; }
.topbar { flex-shrink: 0; }
.topbar { position: sticky; top: 0; z-index: 10; display: flex; align-items: baseline; gap: 12px; padding: 10px 20px; border-bottom: 1px solid var(--grid); background: var(--surface); }
.topbar h1 { font-size: 18px; margin: 0; }
.topbar h1 a { color: inherit; text-decoration: none; }
.topbar h1 a:hover { color: var(--accent); }
.subtitle { color: var(--ink-2); }
.topbar-actions { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.btn { font: inherit; font-size: 12px; padding: 4px 10px; border: 1px solid var(--axis); border-radius: 4px; background: #fff; color: var(--ink-2); cursor: pointer; text-decoration: none; }
.btn:hover { border-color: var(--accent); color: var(--accent); }
.with-btn { display: flex; gap: 4px; min-width: 0; }
.with-btn input { flex: 1 1 auto; min-width: 0; }
.mini-btn { font: inherit; font-size: 11px; padding: 0 6px; border: 1px solid var(--axis); border-radius: 4px; background: #fff; color: var(--ink-2); cursor: pointer; white-space: nowrap; }
.mini-btn:hover { border-color: var(--accent); color: var(--accent); }
.layout { display: grid; grid-template-columns: 400px minmax(0, 1fr); flex: 1; min-height: 0; overflow: hidden; }
.sidebar, .content { min-height: 0; overflow-y: auto; overscroll-behavior-y: contain; }
.content > .panel { flex-shrink: 0; }
.sidebar { border-right: 1px solid var(--grid); background: var(--surface); padding: 14px; overflow-y: auto; }
.content { padding: 14px 20px; display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.panel { background: var(--surface); border: 1px solid var(--grid); border-radius: 6px; padding: 10px 12px; }
.panel h2 { font-size: 14px; margin: 0 0 8px; color: var(--ink-2); font-weight: 600; }
.hint-inline { font-weight: 400; color: var(--muted); font-size: 12px; margin-left: 8px; }
.canvas-wrap { position: relative; width: 100%; }
.canvas-wrap canvas { display: block; cursor: crosshair; }
.canvas-wrap canvas.overlay { position: absolute; left: 0; top: 0; pointer-events: none; }
.tooltip { position: absolute; pointer-events: none; background: var(--ink); color: #fff; padding: 6px 8px; border-radius: 4px; font-size: 12px; line-height: 1.4; max-width: 260px; z-index: 2; }

.controls { display: flex; flex-direction: column; gap: 10px; }
.group { border: 1px solid var(--grid); border-radius: 6px; padding: 6px 10px 8px; margin: 0; min-width: 0; }
.group legend { font-size: 12px; font-weight: 600; color: var(--ink-2); padding: 0 4px; }
.grid2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px 10px; }
.grid4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 6px 8px; }
.grid3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px 8px; }
.rows { display: flex; flex-direction: column; gap: 6px; }
.field.row { flex-direction: row; align-items: center; justify-content: space-between; gap: 8px; }
.field.row > span { flex: 0 0 auto; }
.field.row select { width: auto; flex: 0 1 auto; max-width: 70%; }
.span2 { grid-column: span 2; }
.span3 { grid-column: 1 / -1; }
.field textarea { font: inherit; font-size: 12px; padding: 4px 6px; border: 1px solid var(--axis); border-radius: 4px; resize: vertical; width: 100%; }
[hidden] { display: none !important; }
.field { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.field > span { font-size: 11px; color: var(--ink-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.field input, .field select { font: inherit; font-size: 13px; padding: 3px 6px; border: 1px solid var(--axis); border-radius: 4px; background: #fff; color: var(--ink); width: 100%; min-width: 0; }
.group .hint { margin-top: 6px; }
.field.row-note { display: grid; grid-template-columns: auto minmax(72px, max-content) 1fr; align-items: center; gap: 4px 8px; }
.field.row-note > span:first-child { font-size: 12px; color: var(--ink); white-space: normal; }
.field.row-note input { width: 72px; }
.field.row-note.formula-row { grid-template-columns: auto 1fr; }
.field.row-note.formula-row input { width: 100%; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; }
.field.row-note.formula-row input:disabled { color: var(--muted); background: var(--page); }
.field.row-note select { width: auto; }
.field.row-note .note { grid-column: 1 / -1; margin: 0; white-space: pre-line; }
.note { margin: 0; font-size: 11.5px; line-height: 1.45; color: var(--muted); }
.segmented { display: inline-flex; margin-left: 16px; border: 1px solid var(--axis); border-radius: 6px; overflow: hidden; }
.segmented button { font: inherit; font-size: 13px; padding: 4px 12px; border: none; border-right: 1px solid var(--axis); background: #fff; color: var(--ink-2); cursor: pointer; }
.segmented button:last-child { border-right: none; }
.segmented button:hover { color: var(--accent); }
.segmented button.active { background: var(--accent); color: #fff; }
.segmented.disabled button { cursor: default; color: var(--muted); background: var(--page); }
.segmented.disabled button.active { background: var(--axis); color: #fff; }
/* Inside the parameter panel: no top-bar offset, compact, fills the cell. */
.field .segmented { margin-left: 0; align-self: flex-start; max-width: 100%; flex-wrap: wrap; }
.field .segmented button { font-size: 12px; padding: 3px 10px; white-space: nowrap; }
.field.row-note .segmented { justify-self: start; }
.lengths-info { margin: -4px 0 8px; font-size: 12px; color: var(--ink-2); }
.lengths-info summary { cursor: pointer; }
.lengths-info .token-list { margin: 2px 0 0 14px; }

.field input:disabled { color: var(--muted); background: var(--page); }
.section { font-size: 12px; color: var(--muted); margin: 8px 0 -4px; font-weight: 600; text-transform: none; }
.token-list { font-variant-numeric: tabular-nums; max-height: 72px; overflow-y: auto; word-break: break-word; }
.hint { margin: 0; font-size: 11px; color: var(--muted); line-height: 1.4; }
.error { margin: 0; color: var(--critical); font-size: 12px; }

.tiles { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; margin-bottom: 10px; }
.tile { display: flex; flex-direction: column; gap: 2px; padding: 8px 10px; border: 1px solid var(--grid); border-radius: 6px; }
.tile-label { font-size: 12px; color: var(--ink-2); }
.tile-value { font-size: 20px; font-weight: 600; }
.tile-note { font-size: 11px; color: var(--muted); }
.legend { display: flex; flex-wrap: wrap; gap: 4px 10px; align-items: center; font-size: 12px; color: var(--ink-2); margin-bottom: 10px; }
.swatch { display: inline-block; width: 12px; height: 12px; border-radius: 2px; vertical-align: -2px; margin-right: 4px; border: 1px solid rgba(11,11,11,0.1); }
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; grid-template-rows: minmax(0, 1fr) minmax(0, 1fr); }
  .sidebar { border-right: none; border-bottom: 1px solid var(--grid); }
  .tiles { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.warmup-extra[aria-pressed="true"] { background: var(--accent, #2879d9); color: white; border-color: var(--accent, #2879d9); }
.formula-row .with-btn { min-width: 0; }
.formula-row .with-btn input { min-width: 0; }

.collapsible-group > summary { cursor: pointer; font-size: 12px; font-weight: 600; color: var(--ink-2); padding: 2px 0; }
.collapsible-group[open] > summary { margin-bottom: 8px; }