/* roadmap */
.road { position: relative; display: grid; grid-template-columns: repeat(var(--cols), minmax(0, 1fr)); gap: 12px 48px; }
.road svg.edges { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; overflow: visible; }
.edges path { fill: none; stroke: var(--edge); stroke-width: 1.25; transition: stroke .15s, opacity .15s; }
.edges path.on { stroke: var(--hue); stroke-width: 1.75; }
.road.focus .edges path:not(.on) { opacity: .2; }
.stage { display: flex; flex-direction: column; gap: 8px; min-width: 0; position: relative; z-index: 1; }
.stage-name { font-size: var(--fs-small); color: var(--muted); padding-bottom: 4px; }
.node {
  display: flex; align-items: center; gap: 8px; min-height: 36px; padding: 6px 10px; width: 100%;
  border: 1px solid var(--border); border-radius: var(--radius-control); background: var(--surface);
  font: 400 13px/1.3 var(--font); color: var(--text); text-decoration: none;
  transition: border-color .15s, background .15s, opacity .15s;
}
.node:hover { background: var(--raised); }
.node .st { flex: none; width: 8px; height: 8px; border-radius: 50%; background: var(--edge); transition: background .15s; }
.node .nm { min-width: 0; flex: 1; }
.node .go { color: var(--muted); opacity: 0; transition: opacity .15s; }
.node:hover .go, .node:focus-visible .go { opacity: 1; }
.node .needs { display: none; font-size: var(--fs-small); color: var(--muted); }
.road.focus .node { opacity: .45; }
.road.focus .node.chain { opacity: 1; border-color: var(--hue); }
.road.focus .node.chain .st { background: var(--hue); }
.road.focus .node.on { opacity: 1; border-color: var(--hue); background: var(--hue-soft); }
.road.focus .node.on .st { background: var(--hue); }
.road-foot { font-size: var(--fs-small); color: var(--muted); min-height: 18px; }
.road-foot b { color: var(--text); font-weight: 500; }
@media (max-width: 760px) {
  .road { grid-template-columns: minmax(0, 1fr); gap: 20px; }
  .road svg.edges { display: none; }
  .stage { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .stage-name { grid-column: 1 / -1; }
  .node { display: grid; grid-template-columns: 8px minmax(0, 1fr); align-items: start; column-gap: 8px; min-height: 44px; }
  .node .st { margin-top: 4px; }
  .node .go { display: none; }
  .node .needs { display: block; grid-column: 2; }
  .road-foot { display: none; }
}

/* start here */
.start { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 32px; }
.start-main { display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.start-main h2 { font-size: 20px; }
.lede { font-size: 15px; line-height: 1.65; max-width: 62ch; }
.steps { list-style: none; counter-reset: step; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 14px; }
.steps li { counter-increment: step; display: grid; grid-template-columns: 26px minmax(0, 1fr); gap: 12px; font-size: 15px; line-height: 1.65; }
.steps li::before { content: counter(step); width: 24px; height: 24px; margin-top: 1px; border-radius: 50%; background: var(--text); color: var(--surface); display: grid; place-items: center; font-size: 12px; font-weight: 500; }
.first { background: var(--ground); border-radius: var(--radius-card); padding: var(--pad); display: flex; flex-direction: column; gap: 12px; min-width: 0; align-self: start; }
.first h3 { font-size: var(--fs-section); }
.first > p { font-size: 13px; }
.first-list { margin: 0; padding-left: 1.4em; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); grid-auto-flow: column; grid-template-rows: repeat(3, auto); gap: 10px 24px; font-size: 13px; color: var(--muted); }
.first-list a { color: var(--text); font-size: 14px; font-weight: 500; text-decoration: none; }
.first-list a:hover { text-decoration: underline; text-underline-offset: 3px; }
.first .btn { align-self: flex-start; margin-top: 4px; }
@media (max-width: 860px) { .start { grid-template-columns: minmax(0, 1fr); } }

/* search */
.search { position: relative; width: min(360px, 100%); }
.search svg { position: absolute; left: 11px; top: 10px; width: 16px; height: 16px; color: var(--muted); pointer-events: none; }
.search input { width: 100%; height: 36px; padding: 0 12px 0 34px; border-radius: var(--radius-control); border: 1px solid var(--control); background: var(--surface); color: var(--text); font: 400 14px var(--font); }
.search input::placeholder { color: var(--muted); }
.results {
  position: absolute; top: 42px; left: 0; right: 0; z-index: 20; padding: 6px; max-height: 360px; overflow: auto;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-card);
  box-shadow: 0 12px 32px rgba(0, 0, 0, .14); /* taste-skill-ignore: floating results menu */
}
.results a { display: flex; justify-content: space-between; gap: 12px; padding: 8px 10px; border-radius: var(--radius-control); text-decoration: none; font-size: 14px; }
.results a:hover, .results a.sel { background: var(--raised); }
.results .s { font-size: var(--fs-small); color: var(--muted); white-space: nowrap; }
.results .empty { padding: 8px 10px; }

/* browse by subject */
.browse { display: flex; flex-direction: column; gap: var(--gap); }
.themes { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--gap); }
.theme { gap: 12px; }
.theme h3 { font-size: var(--fs-section); }
.theme .q { font-size: 13px; color: var(--muted); margin-top: 2px; }
.theme .formula { font-size: 15px; padding: 18px 16px; }
.theme-go { margin-top: auto; font-size: 13px; font-weight: 500; text-decoration: none; }
.theme-go:hover { text-decoration: underline; text-underline-offset: 3px; }
.row.cur { cursor: default; }
.row.cur .t { font-weight: 500; }
.foot { font-size: var(--fs-small); color: var(--muted); }
.about { gap: 10px; }
.about p { font-size: 15px; line-height: 1.65; max-width: 80ch; }
@media (max-width: 760px) { .themes { grid-template-columns: minmax(0, 1fr); } .title-row .search { width: 100%; } }

/* an odd last subject card spans the full row */
.theme:last-child:nth-child(odd) { grid-column: 1 / -1; }

/* machine learning hub */
.ml-examples { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: var(--gap); }
.ml-ex { text-decoration: none; color: var(--text); gap: 8px; transition: background .15s, border-color .15s; }
.ml-ex:hover { border-color: var(--control); background: var(--raised); }
.ml-ex h3 { font-size: var(--fs-section); }
.ml-ex p { font-size: 13px; color: var(--muted); line-height: 1.5; }
.ml-go { font-size: 13px; font-weight: 500; margin-top: 4px; }