/* The research tree page, over the calculator's style.css. */

:root {
  --b-robotics: #5b93e6;
  --b-industry: #a08ff0;
  --b-energy: #35b487;
  --b-maintenance: #45adbb;
  --b-defense: #e5734d;
  --b-other: #a9b0ad;
  --node: #1b2021;
  --edge: #3d4546;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --b-robotics: #2f6fd0;
    --b-industry: #7a5cc9;
    --b-energy: #138a64;
    --b-maintenance: #17808f;
    --b-defense: #c4471d;
    --b-other: #69746b;
    --node: #fbfbf7;
    --edge: #bcc3b9;
  }
}

:root[data-theme="light"] {
  --b-robotics: #2f6fd0;
  --b-industry: #7a5cc9;
  --b-energy: #138a64;
  --b-maintenance: #17808f;
  --b-defense: #c4471d;
  --b-other: #69746b;
  --node: #fbfbf7;
  --edge: #bcc3b9;
}

[data-branch] { --b: var(--b-other); }
[data-branch="robotics"] { --b: var(--b-robotics); }
[data-branch="industry"] { --b: var(--b-industry); }
[data-branch="energy"] { --b: var(--b-energy); }
[data-branch="maintenance"] { --b: var(--b-maintenance); }
[data-branch="defense"] { --b: var(--b-defense); }

.research { padding: 16px 20px 32px; }
.research .error { max-width: 760px; }
.tree-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 28px; margin-bottom: 14px; }
.lede { max-width: 560px; color: var(--muted); font-size: 13px; }
.tree-tools { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 12px; }
.tree-tools .hint { margin: 0; max-width: 320px; }
.tree-tools .segmented span { padding: 6px 11px; }

.scroller {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  overscroll-behavior-x: contain;
}
.scroller:focus { outline: none; }
.canvas { position: relative; min-width: 100%; }

.band { border-top: 1px solid var(--line); }
.band:first-child { border-top: 0; }
.band-label {
  position: sticky;
  left: 0;
  z-index: 3;
  display: inline-block;
  padding: 8px 14px 4px;
  font: 600 11px/1.4 var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--b);
}
.band-label em { font-style: normal; color: var(--faint); margin-left: 4px; letter-spacing: 0; }

.edges { position: absolute; left: 0; top: 0; pointer-events: none; overflow: visible; }
.edges path[data-from] { fill: none; stroke: var(--edge); stroke-width: 1.5; marker-end: url(#arrow); transition: opacity .12s, stroke .12s; }
#arrow path { fill: var(--edge); }
#arrow-on path { fill: var(--accent); }
#arrow-next path { fill: var(--ink); }
.edges path.is-other { opacity: .3; }
.has-focus .edges path[data-from] { opacity: .16; }
.has-focus .edges path.is-on { opacity: 1; stroke: var(--accent); stroke-width: 2; marker-end: url(#arrow-on); }
.has-focus .edges path.is-next { opacity: .9; stroke: var(--ink); stroke-dasharray: 4 3; marker-end: url(#arrow-next); }

.node {
  position: absolute;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 9px 6px 6px;
  min-height: 0;
  text-align: left;
  font: 600 12px/1.25 var(--sans);
  color: var(--ink);
  background: var(--node);
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--b);
  border-radius: 5px;
  transition: opacity .12s, border-color .12s, background-color .12s;
}
.node:hover { filter: none; border-color: var(--faint); border-left-color: var(--b); }
.node-picture { flex: none; width: 42px; height: 42px; object-fit: contain; }
.node-text { flex: 1; min-width: 0; align-self: stretch; display: flex; flex-direction: column; justify-content: space-between; gap: 3px; padding: 1px 0; }
.node-name { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.node-meta { display: flex; align-items: baseline; gap: 6px; min-width: 0; font: 400 11px/1.2 var(--sans); color: var(--muted); }
.node-tier { flex: none; font: 600 10.5px/1 var(--mono); color: var(--faint); }
.node-opens { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.node.is-other { opacity: .32; border-style: dashed; border-left-style: solid; }
.has-focus .node { opacity: .38; }
.has-focus .node.is-other { opacity: .25; }
.has-focus .node.is-before, .has-focus .node.is-next { opacity: 1; }
.has-focus .node.is-before { border-color: var(--accent); border-left-color: var(--b); }
.has-focus .node.is-next { border-style: dashed; border-color: var(--ink); border-left: 3px solid var(--b); }
.has-focus .node.is-current { opacity: 1; background: var(--accent-soft); border-color: var(--accent); border-left-color: var(--b); box-shadow: 0 0 0 1px var(--accent); }

.pane {
  position: absolute;
  z-index: 4;
  width: 300px;
  padding: 12px 14px 14px;
  background: var(--panel-2);
  border: 1px solid var(--line-strong);
  border-top: 3px solid var(--accent);
  border-radius: 6px;
  box-shadow: 0 10px 28px rgb(0 0 0 / 0.32);
  font-size: 13px;
}
.pane[hidden] { display: none; }
.pane-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.pane-branch { font: 600 11px/1.4 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--b); }
.pane-close { display: none; padding: 0 8px; min-height: 26px; font-size: 18px; line-height: 1; background: transparent; color: var(--muted); border-color: var(--line-strong); }
.pane.is-pinned .pane-close { display: inline-flex; }
.pane-name { margin: 2px 0 8px; font: 700 17px/1.25 var(--sans); letter-spacing: 0; text-transform: none; color: var(--ink); }
.pane h3 { margin: 10px 0 4px; font: 11px/1.4 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
.pane-opens { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 3px 10px; margin: 0; }
.pane-opens dt { padding-top: 4px; font: 11px/1.6 var(--mono); color: var(--faint); }
.pane-opens dd { margin: 0; color: var(--ink); }
.pane-opens ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 3px; }
.pane-opens li, .pane-figures, .pane-bill li { display: flex; align-items: center; gap: 6px; }
.line-picture { flex: none; width: 26px; height: 26px; object-fit: contain; }
.pane-figures { color: var(--muted); }
.pane-figures b, .pane-bill b { color: var(--ink); font: 600 13px/1.3 var(--mono); font-variant-numeric: tabular-nums; }
.pane-bill { list-style: none; margin: 4px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 2px 12px; color: var(--muted); }
.pane-bill li { gap: 4px; }
.pane-bill .line-picture { width: 22px; height: 22px; }
.pane-path { margin-top: 6px; font-size: 12px; color: var(--faint); }
.pane-dim { color: var(--faint); }
.link-chips { display: flex; flex-wrap: wrap; gap: 5px; }
.link-chip {
  font: 500 12px/1.2 var(--sans);
  min-height: 26px;
  padding: 4px 8px 4px 7px;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--b, var(--line-strong));
  border-radius: 4px;
}
.link-chip { display: inline-flex; align-items: center; gap: 5px; }
.chip-picture { flex: none; width: 20px; height: 20px; object-fit: contain; }
button.link-chip:hover { filter: none; border-color: var(--accent); border-left-color: var(--b); }

@media (max-width: 700px) {
  .research { padding: 12px 16px 24px; }
  .tree-bar { gap: 10px; }
  .pane {
    position: fixed;
    left: 0 !important;
    right: 0;
    top: auto !important;
    bottom: 0;
    width: auto;
    max-height: 58vh;
    overflow-y: auto;
    border-radius: 10px 10px 0 0;
    padding-bottom: calc(16px + env(safe-area-inset-bottom));
  }
  .pane-close { display: inline-flex; }
}