:root {
  /* ════════════════════════════════════════════════════════════════════════
     CENTRAL DESIGN TOKENS
     Single source of truth for every colour / metric in the app. The
     dynamically-injected flow.css and outline.css reference these via var().
     Keep ALL literal colours here — nowhere else.
     ════════════════════════════════════════════════════════════════════════ */

  /* ── Fonts ─────────────────────────────────────────────────────────────── */
  --font-ui: 'Courier New', Courier, monospace;
  --font-mono: 'Courier New', Courier, monospace;

  /* ── Metrics ───────────────────────────────────────────────────────────── */
  --separator-width: 4px;
  --menu-bar-h: 30px;   /* top menu bar height (border-box); app-shell subtracts it */
  /* --param-dock-w is set at runtime by main.js (param-dock resize). */
  /* --flow-bg-alpha is set at runtime by graph_flow.js (toolbar opacity slider). */

  /* ── Text colours ──────────────────────────────────────────────────────── */
  --c-interactive-text: #60d2ff;   /* links / interactive labels */
  --c-label-text: #ffffff;         /* widget + field labels */
  --c-header-text: #000000;        /* headers */
  --c-text: #333333;               /* default body text */
  --c-text-muted: #777777;         /* values, readouts, counts */
  --c-editable-text: #000000;      /* text / number input content */

  /* ── Surfaces & borders ────────────────────────────────────────────────── */
  --c-panel-bg: #c7ccd1;           /* panels, toolbars, sidebar */
  --c-surface: #ffffff7e;            /*nodes, blocks */
  --c-fill-muted: #ececec;         /* pills boxed subtle highlights */
  --c-card-bg: #f5ff9771;          /* tinted card */
  --c-editable-bg: #ffffff3d;        /* text / number input background */
  --c-border: #ffffff;             /* hairline borders, dividers */
  --c-separator: var(--c-panel-bg);

  /* ── General concepts ──────────────────────────────────────────────────── */
  --c-highlight: #09ffea;          /* hover */
  --c-selected: #ff80f2;           /* selection accent */
  --c-selected-entity: var(--c-selected); /* selected entity (flow / viewport) */
  --c-emphasis: #ff8c00;           /* transient op-group emphasis (drag group) */
  --c-temporary: #ffc1f2;          /* in-progress (dragging) node / wire */
  --c-danger: #ff46d7;             /* destructive actions (delete / close) */
  --c-danger-bg: #f3d2d2;          /* destructive hover fill */

  /* ── Entity-graph semantics ────────────────────────────────────────────── */
  --c-ref: #9eff9b;                /* structural reference */
  --c-bound: #449eff;              /* bound pins / values */
  --c-output-fields: #ffab24;             /* entity-out pin */
  --c-wire: #000000;               /* default (numeric) wire colour */
  --c-wire-temp: var(--c-temporary);
  --c-input-pin: #ffffff;           /* input pin (numeric) */
  --c-input-fields: #6ea6ff;       /* unconnected input pins / param-panel slot labels */
  --c-red-slider:   #eb5b92c8;       /* RGBA color-field slider accents */
  --c-green-slider: #38e0aec8;
  --c-blue-slider:  #4498ffc8;
  --c-alpha-slider: #aaaaaac8;

  /* ── Flow window ───────────────────────────────────────────────────────── */
  --c-flow-bg: var(--c-panel-bg);
  --c-flow-toolbar-bg: var(--c-panel-bg);
  --c-flow-canvas-bg: var(--c-panel-bg);

  /* ── Scrollbars ────────────────────────────────────────────────────────── */
  --c-scrollbar: rgba(0, 0, 0, 0.3);
  --c-scrollbar-hover: var(--c-highlight);

  /* ── Controls ──────────────────────────────────────────────────────────── */
  --c-checkbox-bg: #ffffff;
  --c-checkbox-checked: var(--c-selected);

  --c-button-bg: #ffffff;
  --c-button-bg-hover: var(--c-highlight);
  --c-button-bg-active: var(--c-highlight);
  --c-button-bg-pressed: var(--c-selected);

  --c_blinking: magenta;           /* warmup pulse color (see .ui_button_warmup) */

  --c-cmd-button-bg: transparent;
  --c-cmd-button-bg-hover: var(--c-highlight);
  --c-cmd-button-bg-active: var(--c-highlight);
  --c-cmd-button-bg-pressed: var(--c-selected);
  --c-cmd-button-border: 1px solid var(--c-border);

  --c-slider-track: #ffffff48;
  --c-slider-thumb: var(--c-button-bg);
  --c-slider-thumb-hover: var(--c-highlight);

  --c-dropdown-bg: var(--c-editable-bg);
  --c-dropdown-hover: var(--c-highlight);
  --c-dropdown-selected: var(--c-selected);

  /* ── Entity family accents ─────────────────────────────────────────────────
     A taxonomy palette: each entity FAMILY owns a hue region (so unrelated
     types contrast), with lightness/hue steps for SIBLINGS (so a family reads
     as related). Consumed via --entity-accent (see the .EntityClass rules
     below) on flow nodes, outline rows, and the property panel. */
  --c-fam-entity:           #94a3b8;  /* neutral fallback (slate) */

  /* Geometric — blues */
  --c-fam-geometry:         #6f8d88;  /* blue */
  --c-fam-point:            #00c77e;  /* indigo — atomic points stand out */
  --c-fam-curve:            #3ec2ff;  /* sky */
  --c-fam-line:             #3ec2ff;  /* cyan */
  --c-fam-bezier:           #3ec2ff;  /* teal */
  --c-fam-circle:           #3ec2ff;  /* deep sky */
  --c-fam-arc:              #3ec2ff;  /* light sky */

  /* Graphical — amber */
  --c-fam-shape:            #f59e0b;  /* amber */
  --c-fam-shape-element:    #fbbf24;  /* light amber */

  /* Stroke — orange (warm sibling of graphical) */
  --c-fam-stroke:           #f97316;  /* orange */

  /* Loss / targets — rose & pink */
  --c-fam-loss:             #f43f5e;  /* rose */
  --c-fam-loss-para:        #fb7185;  /* light rose */
  --c-fam-loss-image:       #e11d48;  /* deep rose */
  --c-fam-target:           #ec4899;  /* pink */

  --c-fam-func:             #ffffff;  /* emerald */
  --c-fam-vecfunc:          #ffffff;  /* light emerald (vector variant) */

  /* Variables — violet */
  --c-fam-variable:         #ffffff;  /* violet */
  --c-fam-variable-vec2:    #ffffff;  /* light violet */
  --c-fam-variable-vec4:    #ffffff;  /* pale violet */

  font-family: var(--font-ui);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0px;
  padding: 0;
  width: 100%;
  height: 100%;

  /* Firefox: always-visible thin scrollbar when content overflows. */
  scrollbar-width: thin;
  scrollbar-color: var(--c-scrollbar) transparent;

  overflow: hidden;
}

/* ── Top menu bar ─────────────────────────────────────────────────────────── */
/* The menu bar and app shell stack in normal block flow (menu bar first). The
   shell is sized explicitly to the remaining height (see .app-shell) rather than
   flex-grow, so percentage-height descendants — #viewport, the docked-flow
   `calc(100% - …)` — resolve against a definite height at first paint. */
.menu-bar {
  display: flex;
  flex-direction: row;
  align-items: stretch;
  height: var(--menu-bar-h);
  background: var(--c-panel-bg);
  border-bottom: 1px solid var(--c-border);
  user-select: none;
  font-size: 0.85rem;
}

.menu-bar__item {
  position: relative;
  display: flex;
}

.menu-bar__top {
  border: none;
  background: transparent;
  color: inherit;
  padding: 0 12px;
  cursor: pointer;
  font: inherit;
}

.menu-bar__top:hover,
.menu-bar__top--open {
  background: var(--c-highlight);
}

.menu-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  /* Above the viewport overlays (NL command bar / visibility panel, both z-index
     1000 and later in the DOM) so open menus aren't painted under them. */
  z-index: 2000;
  min-width: 200px;
  padding: 4px 0;
  background: var(--c-panel-bg);
  border: 1px solid var(--c-border);
  border-radius: 4px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
}

.menu-dropdown--sub {
  top: -5px;              /* align with the parent row, past the panel padding */
  left: 100%;
  /* The experiment list can be long; scroll it rather than overflow the screen.
     (Safe here — a submenu has no further fly-out to clip.) */
  max-height: 70vh;
  overflow-y: auto;
}

.menu-row {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px 4px 8px;
  cursor: pointer;
  white-space: nowrap;
}

.menu-row:hover {
  background: var(--c-highlight);
}

.menu-row--disabled {
  opacity: 0.4;
  cursor: default;
}
.menu-row--disabled:hover {
  background: transparent;
}

.menu-row__check {
  flex: 0 0 auto;
  width: 1em;
  text-align: center;
}

.menu-row__label {
  flex: 1 1 auto;
}

.menu-row__hint {
  flex: 0 0 auto;
  margin-left: 16px;
  opacity: 0.6;
}

.menu-sep {
  height: 1px;
  margin: 4px 0;
  background: var(--c-border);
}

/* ── Soup dialog (Add ▸ Soup) ──────────────────────────────────────────────── */
.soup-overlay {
  position: fixed;
  inset: 0;
  z-index: 3000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.35);
}

.soup-dialog {
  min-width: 320px;
  max-height: 90vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px;
  background: var(--c-panel-bg);
  border: 1px solid var(--c-border);
  border-radius: 6px;
  color: var(--c-text);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.soup-title {
  font-weight: 700;
  font-size: 15px;
  color: var(--c-header-text);
}

.soup-table {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 4px 16px;
  align-items: center;
}

.soup-th {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--c-text-muted);
  border-bottom: 1px solid var(--c-border);
  padding-bottom: 2px;
}

.soup-cell {
  display: flex;
  align-items: center;
}

.soup-cell--name {
  color: var(--c-label-text);
}

.soup-num {
  width: 70px;
  background: var(--c-editable-bg);
  color: var(--c-editable-text);
  border: 1px solid var(--c-border);
  border-radius: 3px;
  padding: 2px 4px;
}

.soup-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  color: var(--c-label-text);
}

.soup-range-group {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.soup-range-title {
  flex: 0 0 84px;
  color: var(--c-label-text);
}

.soup-range-field {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--c-label-text);
}

.soup-num--sm {
  width: 60px;
}

.soup-lock {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
  cursor: pointer;
  color: var(--c-label-text);
}

.soup-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 4px;
}

.soup-btn {
  padding: 5px 16px;
  background: var(--c-button-bg);
  border: 1px solid var(--c-border);
  border-radius: 3px;
  cursor: pointer;
  color: var(--c-text);
}

.soup-btn:hover {
  background: var(--c-button-bg-hover);
}

.soup-btn--primary {
  font-weight: 700;
}

.app-shell {
  display: grid;
  /* sidebar | viewport | separator | param dock (resizable via the separator).
     minmax(0, 1fr) lets the viewport track shrink below the canvas's pixel width
     so the dock can grow (a bare 1fr's min-content would freeze it). */
  grid-template-columns: 100px minmax(0, 1fr) var(--separator-width) var(--param-dock-w, 320px);
  /* Pin the single row to a definite height. Without this the row defaults to
     `auto` (content-sized); that's usually masked because docked content stays
     under 100vh, but once the flow panel is hidden, viewport height falls back
     to a plain 100% with no definite row to resolve against — and the canvas's
     inline-element baseline gap then ratchets the row (and everything stretched
     to it: sidebar, param dock) taller on every resize event. */
  grid-template-rows: minmax(0, 1fr);
  width: 100vw;
  /* Definite height = viewport minus the menu bar. Restores the deterministic
     first-paint sizing the old `height: 100vh` gave, now that a menu bar sits
     above (was flex-grow, which isn't reliably definite for % children). */
  height: calc(100vh - var(--menu-bar-h));
  min-height: 0;
}

/* ── Right-docked parameter panel ─────────────────────────────────────────── */
.param-dock-separator {
  background: var(--c-separator);
  cursor: col-resize;
}
.param-dock-separator:hover { background: var(--c-highlight); }

.param-dock {
  margin: 0;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: var(--c-panel-bg);
  border-left: 1px solid var(--c-border);
}

.sidebar {
  margin: 0;
  padding: 16px;
  border-right: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--c-panel-bg);
  overflow-x: hidden;
  overflow-y: auto;   /* scroll the whole sidebar if its controls don't fit */
  min-height: 0;      /* allow flex children to shrink below content size */
  height: 100%;       /* fill the full grid row height */
  align-self: stretch;
}

h1 {
  margin: 0 0 4px;
  font-size: 1.15rem;
}

label {
  font-weight: 600;
}

.command-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  align-content: center;
  gap: 8px;
}

/* Pinned to the bottom of the sidebar: the outline / flow "open" buttons, shown
   only while their window is hidden. */
.sidebar-bottom {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 10px;
  border-top: 1px solid var(--c-border);
}

.status {
  margin-top: 8px;
  min-height: 1.5em;
}

/* ── Layer visibility toggle strip (viewport top-right overlay) ──────────── */
.vis-panel {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
  padding: 4px;
  pointer-events: auto;
}

.vis-panel__row {
  display: flex;
  flex-direction: row;
  gap: 4px;
}

.vis-btn {
  --b:1px;   /* border length*/
  --c:8px;  /* the cube perspective */
  
  --g:calc(var(--c)*0.707); /* 0.707 = cos(45deg) = sin(45deg) */
    
  flex: 1;
  padding: 3px 6px;
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 600;

  transition: 0.25s;
  border: solid #000000;
  border-width:var(--b) var(--b) calc(var(--c) + var(--b)) calc(var(--c) + var(--b));
  background: rgb(from var(--entity-accent) r g b / 0.25);
  background-repeat:no-repeat;
  background-origin:border-box;

  transform:translate(calc(var(--c)/-1),calc(var(--c)/1));
  clip-path: 
    polygon(var(--c) 0%, var(--c) 0%, 
    100% 0%, 
    100% calc(100% - var(--c)),100% calc(100% - var(--c)),
    var(--c) calc(100% - var(--c)),
    var(--c) calc(100% - var(--c)));
}

.vis-btn--on {
  /*50% selected 50% entity accent,*/
  /* background: color-mix(in srgb, var(--entity-accent) 50%, var(--c-selected) 50%); */
  background: var(--entity-accent);
  color: var(--c-header-text);
  transform:translate(0,0);
  clip-path: 
    polygon(0% var(--c), var(--c) 0%, 
    100% 0%, 
    100% calc(100% - var(--c)), calc(100% - var(--c)) 100%, 
    0% 100%,0% 100%);
}

/* .vis-btn:hover {
  transform:translate(0,0); 
  clip-path: 
    polygon(0% var(--c), var(--c) 0%, 
    100% 0%, 
    100% calc(100% - var(--c)), calc(100% - var(--c)) 100%, 
    0% 100%,0% 100%);
} */




/* ── Tag visibility pulldown ─────────────────────────────────────────────── */
.tag-vis-menu {
  --b:1px;   /* border length*/
  --c:8px;  /* the cube perspective */
  
  --g:calc(var(--c)*0.707); /* 0.707 = cos(45deg) = sin(45deg) */
    

  /* Floating dropdown: overlay under the toggle row without displacing it. */
  position: absolute;
  top: 100%;
  right: 4px;
  min-width: 150px;
  padding: 4px;
  /*background: var(--c-panel-bg);
  border: 1px solid var(--c-border);
  border-radius: 3px; */
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
  font-family: var(--font-ui);
  font-size: 0.75rem;

  transition: 0.25s;
  border: solid #000000;
  border-width:var(--b) var(--b) calc(var(--c) + var(--b)) calc(var(--c) + var(--b));
  background: transparent;
  background-repeat:no-repeat;
  background-origin:border-box;

  transform:translate(calc(var(--c)/-1),calc(var(--c)/1));
  clip-path: 
    polygon(var(--c) 0%, var(--c) 0%, 
    100% 0%, 
    100% calc(100% - var(--c)),100% calc(100% - var(--c)),
    var(--c) calc(100% - var(--c)),
    var(--c) calc(100% - var(--c)));
}

.tag-vis-menu--pinned {
  /* Pinned: flows in the column beneath the toggle row instead of floating. */
  position: static;
  box-shadow: none;

  transform:translate(0,0);
  clip-path: 
    polygon(0% var(--c), var(--c) 0%, 
    100% 0%, 
    100% calc(100% - var(--c)), calc(100% - var(--c)) 100%, 
    0% 100%,0% 100%);
}

.tag-vis-menu__header {
  display: flex;
  align-items: center;
  gap: 4px;
  padding-bottom: 4px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--c-border);
}

.tag-vis-mode {
  flex: 1;
  padding: 2px 6px;
  font-family: var(--font-ui);
  font-size: 0.7rem;
  font-weight: 600;
  border-radius: 3px;
  cursor: pointer;
  background: transparent;
  border: 1.5px solid var(--c-text-muted);
  color: var(--c-text-muted);
}

.tag-vis-mode--on {
  background: var(--c-selected);
  border-color: transparent;
  color: var(--c-header-text);
}

.tag-vis-mode:hover { border-color: var(--c-highlight); }

.tag-vis-pin {
  padding: 2px 4px;
  font-size: 0.75rem;
  line-height: 1;
  border-radius: 3px;
  cursor: pointer;
  background: transparent;
  border: 1.5px solid transparent;
  opacity: 0.4;
}

.tag-vis-pin--on { opacity: 1; border-color: var(--c-selected); }
.tag-vis-pin:hover { border-color: var(--c-highlight); }

.tag-vis-menu__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-height: 240px;
  overflow-y: auto;
}

.tag-vis-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 1px 2px;
}

.tag-vis-row--virtual .tag-vis-name { font-style: italic; }

.tag-vis-eye {
  padding: 0 2px;
  font-size: 0.85rem;
  line-height: 1;
  border: none;
  background: transparent;
  cursor: pointer;
}

.tag-vis-eye--off { opacity: 0.45; }

.tag-vis-name {
  color: var(--c-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── NL command bar (top-left prompt overlay, mounted by NLCommander into the
   viewport-wrap so it anchors to the viewport corner, not the window) ───────── */
.nl-bar {
  width: calc(100% - 220px);
  position: absolute;
  top: 8px;
  left: 8px;
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px;
  border-radius: 3px;
  background: transparent;
  /* box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3); */
  font-family: var(--font-ui);
  font-size: 0.8rem;
}

.nl-bar__toggle {
  margin: 0;
  padding: 4px 6px;
  border: none;
  border-radius: 6px;
  background: transparent;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
}
.nl-bar__toggle:hover { background: var(--c-button-bg-hover); }

.nl-bar__input {
  width: 70%;
  margin: 0;
  padding: 6px 10px;
  border: 1px solid var(--c-border);
  border-radius: 3px;
  background: var(--c-editable-bg);
  color: var(--c-editable-text);
  font-family: inherit;
  font-size: inherit;
  outline: none;
}
.nl-bar__input::placeholder { color: var(--c-text-muted); }
.nl-bar__input:focus { border-color: var(--c-bound); }
.nl-bar__input:disabled { opacity: 0.6; }

/* Collapsed: the toggle hides the input. */
.nl-bar--collapsed .nl-bar__input { 
  display: none; 
}

.viewport-wrap {
  position: relative;   /* anchor for absolutely-positioned viewport overlays */
  width: 100%;
  height: 100%;
  min-width: 0;   /* allow the viewport column to shrink as the dock grows */
}

#viewport {
  width: 100%;
  height: 100%;
}

/* ════════════════════════════════════════════════════════════════════════════
   INPUT CONTROLS — styled by element type
   Type selectors own the look of every control; the .ui_* classes below only
   handle LAYOUT (label-vs-control placement) and a few cosmetic variants.
   ════════════════════════════════════════════════════════════════════════════ */

button {
  margin : 4px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border: none;
  border-radius: 3px;
  background: var(--c-button-bg);
  cursor: pointer;
  font-size: 0.8rem;
  font-family: var(--font-ui);
  user-select: none;
  transition: background 0.1s;
}
button:hover { background: var(--c-button-bg-hover); }
button:active { background: var(--c-button-bg-active); }

/* select elements / dropdowns */
select {
  margin : 4px;
  width: 100%;
  padding: 2px 4px;
  border: none;
  border-radius: 3px;
  background: var(--c-dropdown-bg);
  cursor: pointer;
  font-size: 0.8rem;
  font-family: var(--font-ui);
}

input {
  margin : 4px;
  font-family: var(--font-ui);
  font-size: 0.8rem;
}

input[type="range"] {
  width: 100%;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  background: transparent;  /* hide the default track */
  height: 20px;           /* control height — track will fill this */
}

/* ── Chromium / Safari ── */
input[type="range"]::-webkit-slider-runnable-track {
  height: 100%;
  border: none;
  border-radius: 6px;
  background: var(--c-slider-track);
  padding: 4px;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  margin-top: 0px;        /* centre thumb: (track 20px - thumb 12px) / 2 */
  border: none;
  border-radius: 6px;
  background: var(--c-slider-thumb);
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb:hover { background: var(--c-slider-thumb-hover); }

/* ── Firefox ── */
input[type="range"]::-moz-range-track {
  height: 100%;
  border: none;
  border-radius: 6px;
  background: var(--c-slider-track);
}
input[type="range"]::-moz-range-thumb {
  width: 10px;
  height: 10px;
  border: none;
  border-radius: 6px;
  background: var(--c-slider-thumb);
  cursor: pointer;
}

input[type="text"],
input[type="number"],
textarea {
  width: 100%;
  padding: 2px 5px;
  border: none;
  border-radius: 3px;
  font-size: 0.8rem;
  background: var(--c-editable-bg);
  color: var(--c-editable-text);
}
input[type="text"]:focus,
input[type="number"]:focus,
textarea:focus { outline: none; }

input[type="color"] {
  width: 24px;
  height: 24px;
  padding: 1px;
  border: none;
  border-radius: 3px;
  cursor: pointer;
  background: none;
}

/* Fully custom checkbox: native rendering ignores background on the unchecked
   box (accent-color only tints the checked fill), so we opt out with
   appearance:none and draw the box + checkmark ourselves. */
input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  margin: 0;
  width: 14px;
  height: 14px;
  cursor: pointer;
  border: 1px solid var(--c-border);
  border-radius: 3px;
  background: var(--c-checkbox-bg);
  display: inline-grid;
  place-content: center;
}
input[type="checkbox"]:checked {
  background: var(--c-checkbox-checked);
  border-color: var(--c-checkbox-checked);
}
/* Checkmark (shown only while checked). */
input[type="checkbox"]::after {
  content: "";
  width: 4px;
  height: 8px;
  border: solid var(--c-editable-text);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) translateY(-1px);
  opacity: 0;
}
input[type="checkbox"]:checked::after { opacity: 1; }

/* Chromium / Safari: visible thumb whenever a panel is scrollable. */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
  background: transparent;
}
::-webkit-scrollbar-button { display: none; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--c-scrollbar);
  border-radius: 8px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--c-scrollbar-hover);
  background-clip: padding-box;
}

/* ════════════════════════════════════════════════════════════════════════════
   UIBuilder widgets — LAYOUT + cosmetic variants only
   ════════════════════════════════════════════════════════════════════════════ */

/* Shared reset for every .ui element. */
.ui {
  font-family: inherit;
  font-size: 0.8rem;
  color: var(--c-text);
}

/* ── Panels ─────────────────────────────────────────────────────────────── */
.ui_v_panel {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 4px 4px 4px 12px;   /* 12px left indent for nested content */
  background-color: var(--c-panel-bg);
}

.ui_h_panel {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 6px;
  padding: 2px 4px;
  background-color: var(--c-panel-bg);
}

/* ── Shared widget row layout ─────────────────────────────────────────────── */
.ui_slider,
.ui_combobox,
.ui_color,
.ui_text_input,
.ui_float_input,
.ui_int_input {
  display: flex;
  flex-direction: column;
  gap: 2px;
  width: 100%;
}

.ui_widget_label {
  font-size: 0.5rem;
  color: var(--c-label-text);
  user-select: none;
}

/* ── Button variants (look comes from button{}; these tweak it) ───────────── */
.ui_button { font-size: 0.8rem; }

/* Warmup state: from pressing Optimize until the first stream update arrives,
   the worker is booting (device init, deserialize, first backward). Pulse the
   button so the user knows something is happening. */
.ui_button_warmup {
  animation: ui_button_blink 0.9s ease-in-out infinite;
}
@keyframes ui_button_blink {
  0%, 100% { background: inherit;            }
  50%      { background: var(--c_blinking);  }
}

.ui_cmd_button {
  /* Tinted by the entity family it creates/modifies (see ENTITY FAMILY ACCENTS
     below): a light background wash plus a solid accent strip along the bottom. */
  background: color-mix(in srgb, var(--entity-accent, var(--c-fam-entity)) 30%, var(--c-cmd-button-bg));
  border: var(--c-cmd-button-border);
  /* border-bottom: 3px solid var(--entity-accent, var(--c-fam-entity)); */
  margin: 0;
  padding: 5px;
  padding-bottom: 3px;
  color: inherit;
}
.ui_cmd_button:hover { background: var(--c-cmd-button-bg-hover); }
.ui_cmd_button:active { background: var(--c-cmd-button-bg-active); }
.ui_cmd_button[aria-pressed="true"] { background: var(--c-cmd-button-bg-pressed); }

.ui_button_icon {
  width: 14px;
  height: 14px;
  object-fit: contain;
}

/* Link-style button: borderless, left-aligned, underlined text. */
.ui_link_button {
  display: block;
  padding: 0;
  border: none;
  background: none;
  text-align: left;
  text-decoration: underline;
  color: var(--c-text);
  cursor: pointer;
}
.ui_link_button:hover,
.ui_link_button:active { background: none; }

/* ── Label ───────────────────────────────────────────────────────────────── */
.ui_label {
  color: var(--c-label-text);
  font-size: 0.75rem;
  user-select: none;
}

/* ── Checkbox (layout; box styling via input[type="checkbox"]) ────────────── */
.ui_checkbox {
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  user-select: none;
  color: var(--c-label-text);
}

/* ── Slider (layout; track/thumb via input[type="range"]) ─────────────────── */
.ui_slider_row {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
}

.ui_slider_input {
  flex: 1;
  min-width: 0;
}

.ui_slider_value {
  width: 4rem;
  text-align: right;
  color: var(--c-text-muted);
  font-size: 0.75rem;
  white-space: nowrap;
}

/* ── Context-dependent label placement ───────────────────────────────────────
   v_panel  → label LEFT  of the control  (row layout)
   h_panel  → label ABOVE the control     (column layout, the default)
──────────────────────────────────────────────────────────────────────────── */

/* --- v_panel: row layout --- */
.ui_v_panel > .ui_slider,
.ui_v_panel > .ui_combobox,
.ui_v_panel > .ui_color,
.ui_v_panel > .ui_text_input,
.ui_v_panel > .ui_float_input,
.ui_v_panel > .ui_int_input {
  flex-direction: row;
  align-items: center;
  gap: 6px;
}

/* Fixed-width label column for alignment */
.ui_v_panel > .ui_slider     > .ui_widget_label,
.ui_v_panel > .ui_combobox   > .ui_widget_label,
.ui_v_panel > .ui_color      > .ui_widget_label,
.ui_v_panel > .ui_text_input > .ui_widget_label,
.ui_v_panel > .ui_float_input > .ui_widget_label,
.ui_v_panel > .ui_int_input  > .ui_widget_label {
  min-width: 5rem;
  flex-shrink: 0;
}

/* Control fills the remaining row space */
.ui_v_panel > .ui_slider      > .ui_slider_row,
.ui_v_panel > .ui_combobox    > select,
.ui_v_panel > .ui_color       > input[type="color"],
.ui_v_panel > .ui_text_input  > input[type="text"],
.ui_v_panel > .ui_float_input > input[type="number"],
.ui_v_panel > .ui_int_input   > input[type="number"] {
  flex: 1;
  width: auto;
  min-width: 0;
}

/* Stacked combobox: label always above the select, regardless of panel
   context. Overrides the v_panel row layout above so long option lists get the
   full width instead of being squeezed by the fixed label column. */
.ui_combobox.ui_combobox_stacked {
  flex-direction: column;
  align-items: stretch;
  gap: 2px;
}
.ui_combobox.ui_combobox_stacked > .ui_widget_label {
  min-width: 0;
}
.ui_combobox.ui_combobox_stacked > select {
  width: 100%;
  min-width: 0;
}

/* --- h_panel: column layout (label above) — already the class default --- */
.ui_h_panel > .ui_slider,
.ui_h_panel > .ui_combobox,
.ui_h_panel > .ui_color,
.ui_h_panel > .ui_text_input,
.ui_h_panel > .ui_float_input,
.ui_h_panel > .ui_int_input {
  flex-direction: column;
  align-items: stretch;
}

/* Color swatch stays a fixed size — no flex-grow in h_panel */
.ui_h_panel > .ui_color > input[type="color"] {
  width: 24px;
  flex: none;
}


/* ── Titled block container ───────────────────────────────────────────────── */
.ui_block {
  background: var(--c-surface);
  border: none;
  border-radius: 4px;
  padding: 6px;
  margin: 6px 0;
}

.ui_block_header {
  font-weight: 700;
  margin-bottom: 4px;
}

/* Labels stack on their own line inside a block body. */
.ui_block_body .ui_label { display: block; }

/* Horizontal divider. */
.ui_hrow {
  border: none;
  border-top: 1px solid var(--c-border);
  margin: 6px 0;
}

/* Checkbox whose label goes bold while checked. */
.ui_bold_checkbox {
  display: flex;
  font-weight: 400;
}
.ui_bold_checkbox:has(input:checked) { font-weight: 700; }

/* Row with a leading checkbox and a gap-filling number input. */
.ui_toggled_float {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 16px;
  font-size: 0.75rem;
  color: var(--c-label-text);
}
.ui_toggled_float input[type="number"] {
  flex: 1;
  min-width: 0;
  font-size: 0.75rem;
}
.ui_toggled_float.ui_disabled { opacity: 0.4; }

/* Row with a leading checkbox and a gap-filling range slider (+ readout). */
.ui_toggled_slider {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 16px;
  font-size: 0.75rem;
  color: var(--c-label-text);
}
.ui_toggled_slider input[type="range"] {
  flex: 1;
  min-width: 0;
}
.ui_toggled_slider .ui_slider_value {
  font-size: 0.75rem;
  min-width: 3.5em;
  text-align: right;
}
.ui_toggled_slider.ui_disabled { opacity: 0.4; }

/* Row with a leading checkbox and a gap-filling <select>. */
.ui_toggled_combobox {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 16px;
  font-size: 0.75rem;
  color: var(--c-label-text);
}
.ui_toggled_combobox select {
  flex: 1;
  min-width: 0;
  font-size: 0.75rem;
}
.ui_toggled_combobox.ui_disabled { opacity: 0.4; }

.ui_toggled_checkbox {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 16px;
  font-size: 0.75rem;
  color: var(--c-label-text);
}
.ui_toggled_checkbox span { flex: 1; min-width: 0; }
.ui_toggled_checkbox.ui_disabled { opacity: 0.4; }

/* ════════════════════════════════════════════════════════════════════════════
   PROPERTY PANEL (right param dock; populated by param_panel.js)
   Mirrors the flow node editor: monospace, white "card" blocks, shared accents.
   ════════════════════════════════════════════════════════════════════════════ */

.ui_property_panel {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 0px;
  flex: 1 1 auto;     /* fill the param dock's height */
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  font-family: var(--font-mono);
}

.ui_property_panel .ui_block_header {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.62rem;
  color: var(--c-header-text);
  /* border-bottom: 1px solid var(--c-border); */
  padding-bottom: 3px;
}

/* Field rows: name on the left, value/editor on the right. */
.ui_property_panel .pp_row {
  display: flex;
  align-items: center;
  gap: 6px;
  min-height: 18px;
}

.ui_property_panel .pp_name {
  flex: none;
  color: var(--c-text);
  white-space: nowrap;
}

.ui_property_panel .pp_input {
  flex: 1;
  margin-left: auto;
  text-align: right;
}
.ui_property_panel .pp_input:focus {
  outline: none;
  border-color: var(--c-bound);
}

/* Multiline variant (prompt / neg-prompt): label stacked above a wrapping,
   vertically-resizable textarea instead of a single-line input beside it. */
.ui_property_panel .pp_row_multiline {
  align-items: stretch;
  flex-direction: column;
  gap: 2px;
}
.ui_property_panel .pp_input_multiline {
  margin-left: 0;
  text-align: left;
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-wrap: break-word;
  resize: vertical;
  min-height: 3.2em;
  font-family: inherit;
  line-height: 1.3;
}

/* Binding indicators + read-only values. */
.ui_property_panel .pp_bound {
  margin-left: auto;
  color: var(--c-ref);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.ui_property_panel .pp_ref_capsule {
  display: inline-flex;
  align-items: center;
  padding: 1px 7px;
  margin: 0;
  background: var(--c-ref);
  border: 1px solid var(--c-ref);
  border-radius: 10px;
  color: #000000;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  cursor: pointer;
  max-width: 12ch;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.ui_property_panel .pp_ref_capsule:hover {
  background: var(--c-highlight);
  color: var(--c-header-text);
}
.ui_property_panel .pp_ro {
  flex: none;
  color: var(--c-bound);
  white-space: nowrap;
}
.ui_property_panel .pp_out {
  color: var(--c-output-fields);
}

/* ── Name editor (entity header) ─────────────────────────────────────────── */
.ui_property_panel .pp_name_row {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 2px 0 4px;
  border-bottom: 1px solid color-mix(in srgb, var(--c-border) 30%, transparent);
  margin-bottom: 2px;
}
.ui_property_panel .pp_name_input {
  flex: 1;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  background: var(--c-editable-bg);
  border: 1px solid transparent;
  border-radius: 3px;
  color: var(--c-editable-text);
  padding: 2px 4px;
}
.ui_property_panel .pp_name_input:focus {
  outline: none;
  border-color: var(--c-bound);
}
.ui_property_panel .pp_name_input::placeholder {
  color: var(--c-text-muted);
  font-weight: 400;
}
.ui_property_panel .pp_name_clear {
  flex-shrink: 0;
  background: none;
  border: none;
  color: var(--c-danger);
  font-size: 0.9rem;
  line-height: 1;
  padding: 0 3px;
  cursor: pointer;
}
.ui_property_panel .pp_name_clear:hover { color: var(--c-highlight); }
.ui_property_panel .pp_name_id {
  flex-shrink: 0;
  font-size: 0.65rem;
  color: var(--c-text-muted);
  white-space: nowrap;
}

.ui_property_panel .pp_delete_btn {
  display: block;
  width: calc(100% - 8px);
  margin: 2px 4px 4px;
  padding: 3px 8px;
  background: transparent;
  border: 1px solid var(--c-danger);
  border-radius: 3px;
  color: var(--c-danger);
  font-family: var(--font-ui);
  font-size: 0.75rem;
  cursor: pointer;
  text-align: center;
}
.ui_property_panel .pp_delete_btn:hover {
  background: var(--c-danger-bg);
}

/* ── Slot Inspector ───────────────────────────────────────────────────────── */
.ui_property_panel .pp_insp_hint {
  color: var(--c-text-muted);
  font-size: 0.72rem;
  font-style: italic;
}
.ui_property_panel .pp_insp_hdr {
  font-weight: 700;
  font-size: 0.75rem;
  color: var(--c-label-text);
  margin-bottom: 3px;
}
.ui_property_panel .pp_insp_row {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-size: 0.75rem;
  margin-bottom: 2px;
}
.ui_property_panel .pp_insp_val {
  color: var(--c-text);
}
.ui_property_panel .pp_insp_res {
  color: var(--c-bound);
}
.ui_property_panel .pp_insp_dep {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  color: var(--c-ref);
  margin-bottom: 3px;
}
.ui_property_panel .pp_insp_depsrc {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.ui_property_panel .pp_insp_disconnect {
  flex-shrink: 0;
  font-size: 0.65rem;
  padding: 1px 5px;
  background: none;
  color: var(--c-danger);
  border: 1px solid var(--c-danger);
  border-radius: 3px;
  cursor: pointer;
  font-family: var(--font-mono);
}
.ui_property_panel .pp_insp_disconnect:hover {
  background: var(--c-danger-bg);
}
.ui_property_panel .pp_insp_lockrange {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
}
.ui_property_panel .pp_insp_locklbl {
  display: flex;
  align-items: center;
  gap: 3px;
  cursor: pointer;
  color: var(--c-text);
  flex-shrink: 0;
  user-select: none;
}
.ui_property_panel .pp_insp_locklbl input[type="checkbox"] { margin: 0; }
.ui_property_panel .pp_insp_range {
  width: 52px;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  background: var(--c-editable-bg);
  border: 1px solid var(--c-border);
  color: var(--c-editable-text);
  text-align: right;
  padding: 1px 3px;
}
.ui_property_panel .pp_insp_range:focus { outline: none; border-color: var(--c-bound); }
.ui_property_panel .pp_insp_range:disabled { opacity: 0.4; }
.ui_property_panel .pp_insp_to {
  color: var(--c-text-muted);
  flex-shrink: 0;
}

/* ── Numeric slot rows (In block) ─────────────────────────────────────────── */
.ui_property_panel .pp_slot_row {
  display: flex;
  align-items: center;
  gap: 4px;
  min-height: 20px;
  padding: 1px 2px;
  border-radius: 3px;
}
.ui_property_panel .pp_slot_row.pp_slot_active {
  background: color-mix(in srgb, var(--c-selected) 18%, transparent);
  outline: 1px solid color-mix(in srgb, var(--c-selected) 40%, transparent);
}
.ui_property_panel .pp_slot_name {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-label-text);
  background: var(--c-input-fields);
  border: none;
  cursor: pointer;
  padding: 2px;
  text-align: left;
  max-width: 90px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.ui_property_panel .pp_slot_name:hover { background: var(--c-highlight); }
.ui_property_panel .pp_slot_slider {
  flex: 1;
  min-width: 0;
  height: 10px;
  cursor: pointer;
  accent-color: var(--c-bound);
}
.ui_property_panel .pp_slot_input {
  width: 62px;
  flex-shrink: 0;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  background: var(--c-editable-bg);
  border: 1px solid var(--c-border);
  color: var(--c-editable-text);
  text-align: right;
  padding: 1px 3px;
}
.ui_property_panel .pp_slot_input.pp_slot_bound {
  color: var(--c-bound);
  background: transparent;
  border-color: transparent;
}
.ui_property_panel .pp_slot_input:focus { outline: none; border-color: var(--c-bound); }
.ui_property_panel .pp_slot_lock {
  flex-shrink: 0;
  cursor: pointer;
  accent-color: var(--c-danger);
}

/* ── Color field header ───────────────────────────────────────────────────── */
.ui_property_panel .pp_color_header {
  display: flex;
  align-items: center;
  gap: 5px;
  min-height: 20px;
  margin-bottom: 1px;
}
.ui_property_panel .pp_color_name {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-text);
  flex-shrink: 0;
}
.ui_property_panel .pp_color_picker {
  flex-shrink: 0;
  width: 26px;
  height: 18px;
  padding: 0 1px;
  border: 1px solid var(--c-border);
  border-radius: 3px;
  cursor: pointer;
  background: none;
}
.ui_property_panel .pp_color_swatch {
  flex-shrink: 0;
  width: 26px;
  height: 18px;
  border: 1px solid var(--c-border);
  border-radius: 3px;
}

/* ── RGBA slider track colours (component_r/g/b/a class set by addColorField) ── */
input[type="range"].component_r::-webkit-slider-runnable-track { background: var(--c-red-slider); }
input[type="range"].component_g::-webkit-slider-runnable-track { background: var(--c-green-slider); }
input[type="range"].component_b::-webkit-slider-runnable-track { background: var(--c-blue-slider); }
input[type="range"].component_a::-webkit-slider-runnable-track { background: var(--c-alpha-slider); }
input[type="range"].component_r::-moz-range-track { background: var(--c-red-slider); }
input[type="range"].component_g::-moz-range-track { background: var(--c-green-slider); }
input[type="range"].component_b::-moz-range-track { background: var(--c-blue-slider); }
input[type="range"].component_a::-moz-range-track { background: var(--c-alpha-slider); }

/* ── Tags section ─────────────────────────────────────────────────────────── */
.ui_property_panel .pp_tags_flow {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 2px 0 4px;
  min-height: 22px;
  align-items: center;
}
.ui_property_panel .pp_tags_empty {
  color: var(--c-text-muted);
  font-size: 0.72rem;
  font-style: italic;
}
.ui_property_panel .pp_tag_capsule {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 2px 5px 8px 7px;
  background: #ffffff;
  border: none;
  border-radius: 10px 10px 0px 0px;
  font-size: 0.7rem;
  color: #000000;
  box-shadow: 5px 5px 5px rgba(0, 0, 0, 0.25);
  white-space: nowrap;
  line-height: 1.4;
  writing-mode: vertical-rl;
}
.ui_property_panel .pp_tag_remove {
  background: #00000031;
  border: none;
  border-radius: 50%;
  color: var(--c-text-muted);
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1;
  padding: 0 1px;
  cursor: pointer;
  flex-shrink: 0;
}
.ui_property_panel .pp_tag_remove:hover { 
  color: var(--c-danger); 
  background-color: var(--c-danger-bg);
}
.ui_property_panel .pp_tags_add_row {
  display: flex;
  align-items: center;
  gap: 4px;
  position: relative;
  margin-top: 1px;
}
.ui_property_panel .pp_tags_input {
  flex: 1;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: var(--c-editable-bg);
  border: 1px solid var(--c-border);
  color: var(--c-editable-text);
  padding: 2px 5px;
  border-radius: 3px;
}
.ui_property_panel .pp_tags_input:focus {
  outline: none;
  border-color: var(--c-bound);
}
.ui_property_panel .pp_tags_input::placeholder { color: var(--c-text-muted); }
.ui_property_panel .pp_tags_add_btn {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
  background: color-mix(in srgb, var(--c-input-fields) 30%, transparent);
  border: 1px solid color-mix(in srgb, var(--c-input-fields) 60%, transparent);
  color: var(--c-label-text);
  border-radius: 3px;
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.ui_property_panel .pp_tags_add_btn:hover {
  background: color-mix(in srgb, var(--c-selected) 35%, transparent);
  border-color: var(--c-selected);
}
.ui_property_panel .pp_tags_dropdown {
  position: absolute;
  top: calc(100% + 2px);
  right: 0;
  z-index: 200;
  min-width: 130px;
  max-height: 160px;
  overflow-y: auto;
  background: var(--c-panel-bg);
  border: 1px solid var(--c-border);
  border-radius: 4px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.35);
}
.ui_property_panel .pp_tags_dropdown_item {
  padding: 4px 9px;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--c-label-text);
  cursor: pointer;
  white-space: nowrap;
  user-select: none;
}
.ui_property_panel .pp_tags_dropdown_item:hover {
  background: color-mix(in srgb, var(--c-selected) 25%, transparent);
}
.ui_property_panel .pp_tags_dropdown_item_active {
  color: var(--c-text-muted);
  font-style: italic;
  cursor: default;
}
.ui_property_panel .pp_tags_dropdown_item_active:hover {
  background: none;
}
.ui_property_panel .pp_tags_dropdown_empty {
  color: var(--c-text-muted);
  font-style: italic;
  cursor: default;
}
.ui_property_panel .pp_tags_dropdown_empty:hover { background: none; }

/* ════════════════════════════════════════════════════════════════════════════
   ENTITY FAMILY ACCENTS
   Each entity-representing element (flow node / outline row / property panel)
   carries its full class chain (e.g. `Entity GeometricEntity PointEntity`).
   These rules resolve that chain to a single --entity-accent: because every
   selector has equal specificity, SOURCE ORDER decides — base classes first,
   leaves last, so the most-derived type wins. The accent is consumed per
   context (flow.css .flow_node, outline.css .go_row, .ui_property_panel below).
   ════════════════════════════════════════════════════════════════════════════ */
.Entity                     { --entity-accent: var(--c-fam-entity); }


.GeometricEntity            { --entity-accent: var(--c-fam-geometry); }
.PointEntity                { --entity-accent: var(--c-fam-point); }
.CurveEntity                { --entity-accent: var(--c-fam-curve); }
.LineEntity,
.InfLineEntity              { --entity-accent: var(--c-fam-line); }
.BezierCurveEntity,
.QuadraticBezierCurveEntity { --entity-accent: var(--c-fam-bezier); }
.CircleBaseEntity           { --entity-accent: var(--c-fam-circle); }
.ArcBaseEntity              { --entity-accent: var(--c-fam-arc); }


.ShapeBase                  { --entity-accent: var(--c-fam-shape); }
.ShapeElement               { --entity-accent: var(--c-fam-shape-element); }


.StrokeProfileBase          { --entity-accent: var(--c-fam-stroke); }


.LossBase                   { --entity-accent: var(--c-fam-loss); }
.ParaLoss                   { --entity-accent: var(--c-fam-loss-para); }
.ImageFrameLoss             { --entity-accent: var(--c-fam-loss-image); }
.ImageLossTargetBase        { --entity-accent: var(--c-fam-target); }

.FuncEntity                 { 
  --entity-accent: var(--c-fam-func); 
}
.VecFuncEntity              { --entity-accent: var(--c-fam-vecfunc); }

.VariableBase               { --entity-accent: var(--c-fam-variable); }
.Vec2Variable               { --entity-accent: var(--c-fam-variable-vec2); }
.Vec4Variable               { --entity-accent: var(--c-fam-variable-vec4); }

/* Property panel: a top accent bar + matching header colour for the selection. */
.ui_property_panel {
  border-top: 50px solid var(--entity-accent, var(--c-fam-entity));
}

/* ── Shape Stack Panel ─────────────────────────────────────────────────────── */
.shape-stack-panel {
  flex: 0 0 30%;
  min-height: 0;
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--c-border);
  background: var(--c-panel-bg);
  overflow: hidden;
}

.shape-stack-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 8px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--c-border);
}

.shape-stack-title {
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--c-label-text);
}

.shape-stack-add-btn {
  background: var(--c-button-bg);
  border: var(--c-cmd-button-border);
  color: var(--c-text);
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: 1rem;
  line-height: 1;
  padding: 1px 6px;
  margin: 0;
  border-radius: 2px;
}
.shape-stack-add-btn:hover { background: var(--c-button-bg-hover); }

.shape-stack-list {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 2px 0;
}

.shape-stack-row {
  display: flex;
  align-items: center;
  padding: 5px 10px;
  cursor: pointer;
  font-size: 0.78rem;
  color: var(--c-text);
  user-select: none;
  border-bottom: 2px solid transparent;
}
.shape-stack-row:hover { background: var(--c-dropdown-hover); }
.shape-stack-row--selected { background: var(--c-selected); color: var(--c-header-text); }
.shape-stack-row--dragging { opacity: 0.35; }
.shape-stack-row--over { border-top: 2px solid var(--c-highlight); }

.shape-stack-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: var(--font-mono);
}

.shape-stack-add-menu {
  position: fixed;
  background: var(--c-panel-bg);
  border: 1px solid var(--c-border);
  border-radius: 3px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  min-width: 150px;
  overflow: hidden;
}

.shape-stack-add-item {
  background: none;
  border: none;
  border-radius: 0;
  padding: 7px 12px;
  margin: 0;
  text-align: left;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: var(--c-text);
  cursor: pointer;
}
.shape-stack-add-item:hover { background: var(--c-dropdown-hover); }

/* ── Tabbed param dock ──────────────────────────────────────────────────────── */
.dock-tabs {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.dock-tabstrip {
  display: flex;
  flex-shrink: 0;
  border-bottom: 1px solid var(--c-border);
  background: var(--c-panel-bg);
}

.dock-tab {
  flex: 1 1 0;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  margin: 0;
  padding: 8px 6px;
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--c-label-text);
}
.dock-tab:hover { background: var(--c-dropdown-hover); }
.dock-tab--active {
  color: var(--c-text);
  border-bottom-color: var(--c-highlight);
}

.dock-tabbodies {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.dock-tabbody {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Panels that reserved a fixed slice under the old stacked layout now fill the
   tab body instead. */
.dock-tabbody > .shape-stack-panel {
  flex: 1 1 auto;
  border-top: none;
}

/* ── Loss tab ───────────────────────────────────────────────────────────────── */
.loss-panel {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.loss-panel-header {
  display: flex;
  align-items: center;
  padding: 4px 8px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--c-border);
}

.loss-panel-title {
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--c-label-text);
}

/* ── Add-loss button + dropdown ─────────────────────────────────────────────── */
.loss-add {
  position: relative;
  margin-left: auto;
}

.loss-add-btn {
  font-size: 0.7rem;
  padding: 3px 8px;
  cursor: pointer;
  border: 1px solid var(--c-border);
  border-radius: 3px;
  background: var(--c-button-bg);
  color: var(--c-text);
}
.loss-add-btn:hover { background: var(--c-button-bg-hover); color: var(--c-header-text); }

.loss-add-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 3px;
  z-index: 20;
  min-width: 160px;
  background: var(--c-panel-bg, var(--c-editable-bg));
  border: 1px solid var(--c-border);
  border-radius: 3px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  overflow: hidden;
}

.loss-add-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 6px 10px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  cursor: pointer;
  border: none;
  background: transparent;
  color: var(--c-text);
}
.loss-add-item:hover { background: var(--c-dropdown-hover); color: var(--c-header-text); }

.loss-list {
  flex: 0 0 auto;
  max-height: 40%;
  overflow-y: auto;
  padding: 2px 0;
  border-bottom: 1px solid var(--c-border);
}

.loss-row {
  padding: 5px 10px;
  cursor: pointer;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--c-text);
  user-select: none;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.loss-row:hover { background: var(--c-dropdown-hover); }
.loss-row--selected { background: var(--c-selected); color: var(--c-header-text); }

.loss-empty {
  padding: 8px 10px;
  font-size: 0.72rem;
  color: var(--c-text-muted);
}

.loss-props {
  flex: 1 1 auto;
  min-height: 0;
}

/* ── ImageFrameLoss target cards (property panel) ───────────────────────────── */
.ui_property_panel .pp_targets_empty {
  font-size: 0.7rem;
  color: var(--c-text-muted);
  padding: 2px 0 4px;
}

.ui_property_panel .pp_target_card {
  border: 1px solid var(--c-border);
  border-radius: 3px;
  padding: 4px 6px;
  margin-bottom: 6px;
  background: var(--c-editable-bg);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.ui_property_panel .pp_target_hdr {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.ui_property_panel .pp_target_title {
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.6rem;
  font-weight: 600;
  color: var(--c-label-text);
}

.ui_property_panel .pp_target_remove {
  background: transparent;
  border: none;
  color: var(--c-text-muted);
  cursor: pointer;
  font-size: 0.9rem;
  line-height: 1;
  padding: 0 4px;
  border-radius: 2px;
}
.ui_property_panel .pp_target_remove:hover {
  background: var(--c-danger-bg);
  color: var(--c-danger);
}

.ui_property_panel .pp_targets_add_row {
  display: flex;
  gap: 6px;
}

.ui_property_panel .pp_target_add_btn {
  flex: 1 1 0;
  background: var(--c-button-bg);
  border: 1px solid var(--c-border);
  border-radius: 3px;
  color: var(--c-text);
  cursor: pointer;
  font-size: 0.7rem;
  padding: 3px 6px;
}
.ui_property_panel .pp_target_add_btn:hover { background: var(--c-button-bg-hover); }

/* ── Shape elements section (Shapes tab, below the stack) ────────────────────── */
.shape-elements-section {
  flex: 2 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-top: 1px solid var(--c-border);
}

.shape-elements-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 8px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--c-border);
}

.shape-elements-title {
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--c-label-text);
}

.shape-elements-list {
  flex: 0 0 auto;
  max-height: 40%;
  overflow-y: auto;
  padding: 2px 0;
  border-bottom: 1px solid var(--c-border);
}

.shape-elements-empty {
  padding: 6px 10px;
  font-size: 0.72rem;
  color: var(--c-text-muted);
}

.shape-element-row {
  display: flex;
  align-items: center;
  padding: 4px 10px;
  cursor: pointer;
  font-size: 0.78rem;
  color: var(--c-text);
  user-select: none;
}
.shape-element-row:hover { background: var(--c-dropdown-hover); }
.shape-element-row--selected { background: var(--c-selected); color: var(--c-header-text); }

.shape-element-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: var(--font-mono);
}

.shape-element-del {
  background: transparent;
  border: none;
  color: var(--c-text-muted);
  cursor: pointer;
  font-size: 0.9rem;
  line-height: 1;
  padding: 0 4px;
  border-radius: 2px;
}
.shape-element-del:hover { background: var(--c-danger-bg); color: var(--c-danger); }

.shape-element-props {
  flex: 1 1 auto;
  min-height: 0;
}