:root {
  --bg: #14110d;
  --panel: #1f1a14;
  --panel2: #2a231a;
  --ink: #ece3d4;
  --muted: #9b8e78;
  --accent: #c9a14a;
  --accent2: #6fae8f;
  --line: #3a3024;
  --process: #2f3a44;
  --external: #2d4356;
  --demand: #6b5410;
  --resource: #5a2f2f;
  --surplus: #333;
  --trash: #4a2420;
  --trash-stroke: #d96b5a;
  --bad: #d96b5a;
  --warn: #d9b35a;
}

* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 14px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  display: flex; flex-direction: column; height: 100vh; overflow: hidden;
}
header {
  display: flex; align-items: baseline; justify-content: space-between;
  padding: 10px 18px; background: var(--panel); border-bottom: 1px solid var(--line);
}
h1 { font-size: 18px; margin: 0; font-weight: 600; }
h1 .muted { color: var(--muted); font-weight: 400; font-size: 14px; }
.header-right { display: flex; align-items: center; gap: 12px; }
.version { color: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.gh-link { display: inline-flex; color: var(--muted); transition: color .12s; }
.gh-link:hover { color: var(--ink); }
.gh-link svg { display: block; fill: currentColor; }
.muted { color: var(--muted); }

.layout { display: grid; grid-template-columns: 320px 1fr; flex: 1; min-height: 0; transition: grid-template-columns .15s; }
.layout.collapsed { grid-template-columns: 0 1fr; }
.layout.collapsed .panel { padding: 0; overflow: hidden; border-right: none; }
.attribution {
  flex: 0 0 auto; display: flex; flex-wrap: wrap; align-items: center; gap: 3px 12px;
  padding: 6px 18px; background: var(--panel); border-top: 1px solid var(--line);
  color: var(--muted); font-size: 11px; line-height: 1.5;
}
.attribution a { color: var(--muted); text-decoration: underline; text-underline-offset: 2px; }
.attribution a:hover { color: var(--ink); }
.attribution .build { margin-left: auto; font-variant-numeric: tabular-nums; opacity: 0.85; }
#sidebarToggle { background: var(--panel2); color: var(--ink); border: 1px solid var(--line); border-radius: 6px; cursor: pointer; font-size: 14px; padding: 2px 8px; margin-right: 6px; }
#sidebarToggle:hover { border-color: var(--accent); }
.panel {
  background: var(--panel); border-right: 1px solid var(--line);
  overflow-y: auto; padding: 14px; display: flex; flex-direction: column; gap: 16px;
}
section { display: flex; flex-direction: column; gap: 8px; }
details#advanced { display: flex; flex-direction: column; gap: 16px; border-top: 1px solid var(--line); padding-top: 14px; }
details#advanced > summary { cursor: pointer; color: var(--accent); font-size: 12px; text-transform: uppercase; letter-spacing: .06em; font-weight: 600; list-style: none; }
details#advanced > summary::before { content: '▸ '; }
details#advanced[open] > summary::before { content: '▾ '; }
details#advanced #lpOnly { display: flex; flex-direction: column; gap: 16px; }
h2 { font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--accent); margin: 0 0 2px; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--muted); }
label.check { flex-direction: row; align-items: center; gap: 8px; color: var(--ink); }
label small { color: var(--muted); font-weight: 400; }
input, select, button { font: inherit; }
input[type=text], input[type=number], select {
  background: var(--panel2); border: 1px solid var(--line); color: var(--ink);
  border-radius: 6px; padding: 7px 8px;
}
input:focus, select:focus { outline: 1px solid var(--accent); }
.rate-row { display: flex; gap: 6px; }
/* number stays compact; the unit select takes the rest and may shrink (min-width:0) so a long
   option label like "dispatch quota" never overflows the sidebar instead of widening the row. */
.rate-row input { flex: 0 1 90px; min-width: 0; }
.rate-row select { flex: 1 1 auto; min-width: 0; }
.skills-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 6px; }
.skills-grid label { gap: 2px; }
.skills-grid input { width: 100%; }
.hint { font-size: 11px; color: var(--muted); margin: 0; }

/* CSS-only tooltips. An ⓘ trigger reveals its data-tip on hover, replacing the inline
   (parenthetical) <small> label hints so the sidebar stays compact. The trigger is pinned to
   the label's top-right corner (out of flow, so it never pushes onto its own line the way an
   inline child of a flex-column label would). The bubble drops below it, right-anchored, so it
   can never overflow the 320px panel to the right. */
label, h2 { position: relative; }
.info {
  position: absolute; top: 0; right: 0;
  display: inline-flex; align-items: center; justify-content: center;
  width: 14px; height: 14px;
  border: 1px solid var(--line); border-radius: 50%;
  font-size: 10px; font-weight: 700; font-style: normal; line-height: 1;
  color: var(--muted); cursor: help; user-select: none;
}
.info:hover { color: var(--ink); border-color: var(--accent); }
.info::after {
  content: attr(data-tip);
  position: absolute; right: 0; top: calc(100% + 4px); z-index: 50;
  width: max-content; max-width: 230px; padding: 6px 8px;
  background: var(--panel2); color: var(--ink);
  border: 1px solid var(--line); border-radius: 6px; box-shadow: 0 4px 12px rgba(0,0,0,.45);
  font-size: 11px; font-weight: 400; line-height: 1.35; letter-spacing: 0;
  text-transform: none; white-space: normal; pointer-events: none;
  opacity: 0; visibility: hidden; transition: opacity .12s;
}
.info:hover::after { opacity: 1; visibility: visible; }
/* In the 3-wide skills grid each tooltip is anchored to its narrow cell, so the default
   right-anchor would spill a left-column bubble off the panel. Anchor by column: left edge
   for col 1, centred for col 2, right edge (default) for col 3 — each stays inside the panel. */
.skills-grid label:nth-child(3n+1) .info::after { left: 0; right: auto; }
.skills-grid label:nth-child(3n+2) .info::after { left: 50%; right: auto; transform: translateX(-50%); }

button.primary { background: var(--accent); color: #1a1407; border: none; border-radius: 7px; padding: 11px; font-weight: 600; cursor: pointer; }
button.primary:hover { filter: brightness(1.08); }
button.secondary { background: transparent; color: var(--muted); border: 1px solid var(--line); border-radius: 7px; padding: 8px; cursor: pointer; }
button.secondary:hover { color: var(--ink); border-color: var(--accent); }

.chips { display: flex; flex-wrap: wrap; gap: 5px; }
.chip { background: var(--external); color: var(--ink); border-radius: 12px; padding: 3px 8px 3px 10px; font-size: 12px; display: inline-flex; align-items: center; gap: 6px; }
.chip button { background: none; border: none; color: var(--ink); cursor: pointer; padding: 0; font-size: 14px; line-height: 1; opacity: .7; }
.chip button:hover { opacity: 1; }

.belt-rows { display: flex; flex-direction: column; gap: 4px; }
.belt-row { display: flex; align-items: center; gap: 8px; background: var(--panel2); border: 1px solid var(--line); border-radius: 6px; padding: 4px 8px; font-size: 12px; }
.belt-row .belt-item { flex: 1; color: var(--ink); }
.belt-row .belt-rate { color: var(--accent); font-variant-numeric: tabular-nums; cursor: pointer; border-bottom: 1px dotted transparent; }
.belt-row .belt-rate:hover { border-bottom-color: currentColor; }
/* a "full belt" (unset) rate reads as the muted default, distinct from an explicit cap */
.belt-row .belt-rate-auto { color: var(--muted); font-style: italic; }
.belt-row .belt-rate-edit { width: 84px; padding: 2px 6px; font-size: 12px; font-variant-numeric: tabular-nums; }
.belt-row button { background: none; border: none; color: var(--muted); cursor: pointer; font-size: 14px; line-height: 1; padding: 0; }
.belt-row button:hover { color: var(--ink); }
.belt-add { display: flex; gap: 5px; }
.belt-add #beltItem { flex: 1; min-width: 0; }
.belt-add #beltRate { width: 90px; }
.belt-add button { white-space: nowrap; }

/* output targets — each a two-row block: product <select> on top, then "@ qty unit" */
label.cap { margin-top: 2px; }
.target { display: flex; flex-direction: column; gap: 5px; }
#primaryTarget { margin-top: 2px; }
.target-rows { display: flex; flex-direction: column; gap: 12px; margin-top: 12px; }
.target .t-item { width: 100%; }
.t-qty-row { display: flex; align-items: center; gap: 6px; }
.t-qty-row .at { color: var(--muted); font-size: 13px; }
.t-qty-row .t-rate { flex: 0 0 64px; width: 64px; min-width: 0; text-align: right; }
.t-qty-row .t-unit { flex: 1 1 auto; min-width: 0; }
.t-qty-row .t-del { flex: 0 0 auto; background: none; border: none; color: var(--muted); cursor: pointer; font-size: 16px; line-height: 1; padding: 0 4px; }
.t-qty-row .t-del:hover { color: var(--ink); }
button.add-target { margin-top: 2px; width: 100%; font-size: 12px; padding: 6px; }

main { display: flex; flex-direction: column; overflow: hidden; padding: 10px 12px; gap: 8px; }
.status { flex: 0 0 auto; font-size: 13px; }
.status.error { color: var(--bad); }
.status.ok { color: var(--accent2); }
.status .warn { color: var(--warn); display: block; font-size: 11px; margin-top: 2px; opacity: 0.85; }

.summary { flex: 0 0 auto; display: flex; flex-direction: column; gap: 6px; font-size: 12.5px; }
.summary .stat-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: flex-start; }
.summary .stat { background: var(--panel); border: 1px solid var(--line); border-radius: 7px; padding: 5px 10px; white-space: nowrap; }
.summary .stat b { color: var(--accent); font-variant-numeric: tabular-nums; }
.summary .stat b.profit-pos { color: var(--accent2); }
.summary .stat b.profit-neg { color: var(--bad); }
.machine-chips { display: flex; flex-wrap: wrap; gap: 5px; max-height: 56px; overflow-y: auto; }
.mchip { background: var(--panel); border: 1px solid var(--line); border-radius: 6px; padding: 3px 8px; font-size: 11.5px; color: var(--muted); }
.mchip b { color: var(--ink); font-variant-numeric: tabular-nums; }

.graph-wrap { flex: 1; min-height: 0; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; position: relative; overflow: hidden; }
.graph-toolbar { position: absolute; top: 8px; left: 8px; right: 8px; z-index: 2; display: flex; flex-direction: column; align-items: flex-start; gap: 6px; pointer-events: none; }
.toolbar-btns { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; pointer-events: auto; }
.graph-toolbar button { background: var(--panel2); color: var(--ink); border: 1px solid var(--line); border-radius: 6px; height: 28px; min-width: 30px; padding: 0 6px; cursor: pointer; white-space: nowrap; }
.graph-toolbar button#zoomIn, .graph-toolbar button#zoomOut { padding: 0; }
.legend { display: flex; flex-wrap: wrap; gap: 8px; font-size: 11px; color: var(--muted); background: rgba(20,17,13,0.7); padding: 3px 8px; border-radius: 6px; pointer-events: auto; }
.lg::before { content: ''; display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 4px; vertical-align: middle; }
.lg.process::before { background: var(--process); } .lg.external::before { background: var(--external); }
.lg.demand::before { background: var(--demand); } .lg.resource::before { background: var(--resource); }
.lg.fuel::before { background: #b5654a; } .lg.fert::before { background: #5aa37a; }
.lg.cash::before { background: #d4af37; }
.lg.surplus::before { background: var(--surplus); }
.lg.recycle::before { background: #6a7a8a; }
svg#graph { width: 100%; height: 100%; cursor: grab; }
svg#graph:active { cursor: grabbing; }

/* hover spotlight: dim everything except the hovered node, its edges & neighbours.
   The fade alone carries the focus — highlighted nodes/edges keep their own colours
   (no accent recolouring), and the production-line boxes recede with everything else. */
svg#graph.hovering .node { opacity: 0.18; transition: opacity .08s; }
svg#graph.hovering .edge { opacity: 0.06; transition: opacity .08s; }
svg#graph.hovering .cluster,
svg#graph.hovering .clusterlabel,
svg#graph.hovering .clustersub { opacity: 0.18; transition: opacity .08s; }
svg#graph.hovering .node.hl { opacity: 1; }
svg#graph.hovering .edge.hl { opacity: 1; }
svg#graph.hovering .cluster.hl,
svg#graph.hovering .clusterlabel.hl,
svg#graph.hovering .clustersub.hl { opacity: 1; }
svg#graph.hovering .edge.hl path { stroke-width: 2.4; }
svg#graph.hovering .edge.hl text { fill: var(--ink); }
.node { cursor: default; }

.node rect { stroke: var(--line); stroke-width: 1; rx: 7; }
.node.process rect { fill: var(--process); }
.node.external rect { fill: var(--external); }
.node.demand rect { fill: var(--demand); }
.node.resource rect { fill: var(--resource); }
.node.surplus rect { fill: var(--surplus); stroke-dasharray: 3 3; }
.node.trash rect { fill: var(--trash); stroke: var(--trash-stroke); stroke-dasharray: 3 3; }
.node text { fill: var(--ink); font-size: 12px; }
.node .sub { fill: var(--muted); font-size: 10.5px; }
.node .count { fill: var(--accent); font-weight: 700; font-size: 12px; }
.node .draw { fill: var(--muted); font-size: 10px; }
.node .util { fill: var(--warn); font-size: 10px; font-weight: 600; }
.node .fuelband { fill: var(--resource); }
.node .fueltext { fill: #f0c9c0; font-size: 10px; }
.node .fertband { fill: #2f4a36; }
.node .ferttext { fill: #bfe3c8; font-size: 10px; }
.node .recircband { fill: #2c3a4a; }
.node .recircbandtext { fill: #b9cfe6; font-size: 10px; }
rect.cluster { fill-opacity: 0.06; stroke-opacity: 0.5; stroke-width: 1.2; stroke-dasharray: 2 4; }
rect.cluster.belt { fill-opacity: 0.1; stroke-opacity: 0.7; stroke-dasharray: none; }
.clusterlabel { font-size: 12px; font-weight: 700; }
.clustersub { font-size: 10.5px; font-weight: 600; fill-opacity: 0.85; }
.node .badge { font-size: 9px; font-weight: 700; }
.node .badge.FRAGILE, .node .badge.TIE { fill: var(--warn); }
.node .badge.ASSUMPTION { fill: var(--accent2); }
.edge path { fill: none; stroke: #6a9fd4; stroke-width: 1.4; opacity: 0.85; }
.edge.heat path { stroke: #b5654a; }       /* fuel → red */
.edge.heat text { fill: #c98a76; }
.edge.nutrient path { stroke: #5aa37a; }   /* fertilizer → green */
.edge.nutrient text { fill: #7cc09a; }
.edge.cash path { stroke: #d4af37; }   /* coins → gold, solid like fuel/fert */
.edge.cash text { fill: #e0c34d; }
.edge.trunk path { stroke-width: 2.6; opacity: 0.95; }
.edge.trunk text { font-size: 11px; font-weight: 600; }
.edge.recycle path { stroke: #6a7a8a; stroke-dasharray: 4 3; opacity: 0.7; }
.edge.recycle text { fill: #6a7a8a; }
/* return/feedback lines (fuel/fert/trash routed against the flow) are de-emphasised */
.edge.back path { opacity: 0.66; }
.edge.back text { opacity: 0.66; }
/* produced fuel/fert fed back to sustain the same/sister tiles — support plumbing, dimmed */
.edge.feeder path { opacity: 0.55; }
.edge.feeder text { opacity: 0.7; }
.edge text { fill: var(--muted); font-size: 10px; }
.edge text.bg { stroke: var(--panel); stroke-width: 3; paint-order: stroke; }

details#explainBox { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px; }
details#explainBox summary { cursor: pointer; color: var(--muted); font-size: 12px; }
pre#explain { white-space: pre; overflow-x: auto; font-size: 11.5px; color: var(--ink); margin: 8px 0 0; max-height: 320px; }