/* SST 115 Knowledge Map. Builds on /assets/kb.css. */

:root {
  --card: var(--panel);
  --gate-fill: var(--panel);
  --gate-stroke: var(--fg);
  --wire: color-mix(in srgb, var(--fg) 85%, var(--page-bg));
  --node-new: var(--panel);
  --node-visited: color-mix(in srgb, var(--accent) 8%, var(--panel));
  --node-practiced: color-mix(in srgb, var(--accent) 22%, var(--panel));
  --node-done: var(--accent);
  --node-done-fg: var(--page-bg);
  --edge: color-mix(in srgb, var(--fg) 45%, var(--page-bg));
  --right-bg: color-mix(in srgb, var(--pos) 10%, var(--panel));
  --wrong-bg: color-mix(in srgb, var(--neg) 10%, var(--panel));
  --mark-bg: color-mix(in srgb, var(--gold) 25%, var(--panel));
}

body.wide { max-width: 1300px; }

.lede { color: var(--muted); margin: 0.25rem 0 0; max-width: 46rem; }
.err { color: var(--neg); font-weight: 600; }
.note { color: var(--muted); font-size: 0.92rem; border-left: 3px solid var(--line-strong); padding-left: 0.75rem; }
.figure { margin: 1.25rem 0; text-align: center; overflow-x: auto; }
.figure .cap, .cap { color: var(--muted); font-size: 0.88rem; margin-top: 0.4rem; text-align: center; }

/* ---------- circuits and tables */
svg.circuit { max-width: 100%; height: auto; overflow: visible; }
svg.circuit .gb { fill: var(--gate-fill); stroke: var(--gate-stroke); stroke-width: 2; stroke-linejoin: round; }
svg.circuit .gb.open, svg.circuit .open { fill: none; }
svg.circuit .gw { fill: none; stroke: var(--wire); stroke-width: 1.8; }
svg.circuit .gl { fill: var(--fg); font: 600 14px "SF Mono", Menlo, Consolas, monospace; }
svg.circuit .gl.gout { fill: var(--accent); }
svg.circuit .gv { font: 700 12px "SF Mono", Menlo, Consolas, monospace; }
svg.circuit .gv.v1 { fill: var(--pos); }
svg.circuit .gv.v0 { fill: var(--neg); }
svg.circuit .dotj { fill: var(--wire); }

table.tt td.out.first, table.tt th.out.first { border-left: 3px double var(--line-strong); }
table.tt td.out { font-weight: 700; }
table.tt tr.mark td { background: var(--mark-bg); }
table.compact { max-width: 100%; }
.explain table.compact, .sol table.compact, .q table.compact { margin: 1rem 0; }
.explain, .q, .sol, .example { overflow-wrap: anywhere; }
.explain .scroll, .tablewrap { overflow-x: auto; }

/* ---------- map (wide) */
.map-wide { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; padding-bottom: 0.5rem; }
.map-narrow { display: none; }
.mapsvg { display: block; max-width: none; font-family: inherit; }
.mapsvg .mh1 { font-size: 17px; font-weight: 700; fill: var(--accent); text-anchor: middle; }
.mapsvg .mh2 { font-size: 15px; fill: var(--fg); text-anchor: middle; }
.mapsvg .mh3 { font-size: 14px; fill: var(--muted); text-anchor: middle; }
.mapsvg .medge { fill: none; stroke: var(--edge); stroke-width: 1; opacity: 0.55; transition: opacity 0.15s; }
.mapsvg .mnode rect { fill: var(--node-new); stroke: var(--edge); stroke-width: 1.4; transition: stroke-width 0.1s; }
.mapsvg .mnode text { font-size: 15px; fill: var(--fg); text-anchor: middle; pointer-events: none; }
.mapsvg .mnode text.tick { font-size: 17px; font-weight: 700; fill: var(--accent-light); }
.mapsvg .mnode.s-visited rect { fill: var(--node-visited); stroke: var(--accent-light); }
.mapsvg .mnode.s-practiced rect { fill: var(--node-practiced); stroke: var(--accent-light); }
.mapsvg .mnode.s-done rect { fill: var(--node-done); stroke: var(--node-done); }
.mapsvg .mnode.s-done text { fill: var(--node-done-fg); font-weight: 600; }
.mapsvg .mnode:hover rect, .mapsvg .mnode:focus rect { stroke-width: 2.6; stroke: var(--accent); }
.mapsvg .mnode:focus { outline: none; }
.mapsvg.hl .mnode { opacity: 0.3; }
.mapsvg.hl .mnode.focus, .mapsvg.hl .mnode.pre, .mapsvg.hl .mnode.dep { opacity: 1; }
.mapsvg.hl .mnode.pre rect { stroke: var(--amber-border); stroke-width: 2.4; }
.mapsvg.hl .mnode.dep rect { stroke: var(--accent-light); stroke-width: 2.4; stroke-dasharray: 4 2; }
.mapsvg.hl .medge { opacity: 0.1; }
.mapsvg.hl .medge.on { opacity: 1; stroke: var(--accent); stroke-width: 2; }

.stars { color: var(--amber-border); letter-spacing: 0.05em; }
.mapsvg .mnode text.stars { font-size: 14px; fill: var(--amber-border); text-anchor: end; letter-spacing: 0; }
.mapsvg .mnode.s-done text.stars { fill: color-mix(in srgb, var(--gold) 55%, var(--node-done-fg)); }
.mapsvg .mnode text.tick { text-anchor: start; }
.node-stars { font-size: 1rem; letter-spacing: 0.1em; margin-left: 0.3rem; }
.star-word { text-transform: none; letter-spacing: 0; }
.star-legend { margin-top: 0.35rem; }
.star-legend .stars { min-width: 2.6em; }
.only3 { display: inline-flex; align-items: center; gap: 0.4rem; font-size: 0.9rem; margin: 0 0 0.75rem; cursor: pointer; user-select: none; }
.only3 input { width: 1rem; height: 1rem; accent-color: var(--accent); }
.only3-on .mnode:not([data-stars="3"]) { opacity: 0.22; }
.only3-on .mapsvg.hl .mnode:not([data-stars="3"]).focus,
.only3-on .mapsvg.hl .mnode:not([data-stars="3"]).pre,
.only3-on .mapsvg.hl .mnode:not([data-stars="3"]).dep { opacity: 0.6; }
.only3-on .acc li:not([data-stars="3"]) { opacity: 0.35; }

.legend { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 0.4rem 1.2rem; font-size: 0.85rem; color: var(--muted); margin: 1rem 0 0; }
.legend li { display: flex; align-items: center; gap: 0.4rem; }
.lg, .dot { display: inline-block; width: 14px; height: 14px; border-radius: 4px; border: 1.5px solid var(--edge); background: var(--node-new); flex: 0 0 auto; }
.s-visited > .lg, .s-visited .dot, .lg.s-visited { background: var(--node-visited); border-color: var(--accent-light); }
.lg.s-practiced, .s-practiced .dot { background: var(--node-practiced); border-color: var(--accent-light); }
.lg.s-done, .s-done .dot { background: var(--node-done); border-color: var(--node-done); }
.lg.s-practiced::after, .s-practiced .dot::after, .lg.s-done::after, .s-done .dot::after {
  content: "✓"; display: block; font-size: 10px; line-height: 11px; text-align: center; font-weight: 700; color: var(--accent);
}
.lg.s-done::after, .s-done .dot::after { color: var(--node-done-fg); }

/* ---------- map (narrow): accordion */
@media (max-width: 860px) {
  .map-wide { display: none; }
  .map-narrow { display: block; }
  .legend { margin-top: 0.5rem; }
}
.acc { border: 1px solid var(--line); border-radius: 8px; background: var(--card); margin-bottom: 0.6rem; }
.acc summary { cursor: pointer; padding: 0.7rem 0.9rem; display: flex; justify-content: space-between; gap: 0.75rem; font-weight: 600; color: var(--accent); list-style: none; }
.acc summary::-webkit-details-marker { display: none; }
.acc summary::before { content: "▸"; color: var(--muted); margin-right: -0.25rem; }
.acc[open] summary::before { content: "▾"; }
.acc .acc-t { flex: 1; }
.acc .acc-c { color: var(--muted); font-weight: 400; font-size: 0.85rem; white-space: nowrap; }
.acc ol { margin: 0; padding: 0 0.9rem 0.25rem 2.2rem; }
.acc li { margin: 0.15rem 0 0.55rem; }
.acc li a { color: var(--fg); text-decoration: none; display: inline-flex; gap: 0.5rem; align-items: center; padding: 0.15rem 0; }
.acc li a:hover { color: var(--accent); text-decoration: underline; }
.acc .needs { color: var(--muted); font-size: 0.82rem; margin-left: 1.4rem; line-height: 1.35; }
.acc-quiz { margin: 0 0.9rem 0.8rem; font-size: 0.9rem; }
.acc-quiz a, .acc-check a { color: var(--accent); font-weight: 600; }

/* ---------- node view */
.crumbs { font-size: 0.9rem; margin-bottom: 0.75rem; }
.crumbs a, .pager a, .deps a, .explain a, .sol a, .q a, .example a, .ptag a, .checklist a, .review a { color: var(--accent); }
.node-head .why { margin: 0.4rem 0 0.25rem; }
.node-head .deps { font-size: 0.9rem; color: var(--muted); margin: 0.25rem 0 0; display: flex; flex-direction: column; gap: 0.15rem; }
.explain h3 { margin-top: 1.75rem; }
.explain ul, .explain ol { padding-left: 1.4rem; }
.pager { display: flex; justify-content: space-between; gap: 1rem; margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid var(--line); font-size: 0.92rem; }
.pager .next { text-align: right; margin-left: auto; }
.pager a { text-decoration: none; }
.pager a:hover { text-decoration: underline; }

/* ---------- practice */
.practice h2 { margin-top: 0; border: none; padding: 0; }
.pnote { color: var(--muted); font-size: 0.9rem; margin-top: 0.25rem; }
.prob {
  background: var(--card);
  border: 1px solid var(--line-strong);
  border-left-width: 4px;
  border-radius: 6px;
  padding: 0.85rem 1rem;
  margin: 1rem 0;
}
.prob.right { border-color: var(--pos); }
.prob.wrong { border-color: var(--neg); }
.ptag { color: var(--muted); font-size: 0.8rem; letter-spacing: 0.03em; margin-bottom: 0.35rem; }
.done-tag { color: var(--pos); font-weight: 600; }
.q > :first-child { margin-top: 0; }
.choices { display: grid; gap: 0.45rem; margin: 0.6rem 0; }
.choice {
  border: 1.5px solid var(--line-strong);
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  background: var(--page-bg);
  overflow-x: auto;
}
.choice > :first-child { margin-top: 0; }
.choice > :last-child { margin-bottom: 0; }
.choice:hover:not([aria-disabled]), .choice:focus { border-color: var(--accent-light); outline: none; }
.choice[aria-disabled] { cursor: default; }
.choice.is-answer { border-color: var(--pos); background: var(--right-bg); }
.choice.is-wrong { border-color: var(--neg); background: var(--wrong-bg); }
.choice table.compact { margin: 0.25rem 0; }
.answer-row { display: flex; gap: 0.5rem; flex-wrap: wrap; margin: 0.6rem 0; }
.answer-row input {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 1rem;
  padding: 6px 10px;
  min-width: 0;
  flex: 1 1 160px;
  max-width: 320px;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  background: var(--card);
  color: var(--fg);
}
.fb { font-weight: 700; min-height: 1.2rem; }
.fb .ok { color: var(--pos); }
.fb .no { color: var(--neg); }
.sol { margin-top: 0.5rem; padding-top: 0.5rem; border-top: 1px dashed var(--line-strong); font-size: 0.95rem; overflow-x: auto; }
.sol-h { font-weight: 700; color: var(--accent); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.05em; }
.pbtns { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 0.5rem; }
.pbtns:empty { display: none; }

/* ---------- quiz */
.quiz-meta { display: flex; justify-content: space-between; color: var(--muted); margin: 0.25rem 0 0; }
.clock { font-family: "SF Mono", Menlo, monospace; font-weight: 600; color: var(--fg); }
.score { text-align: center; padding: 1rem; border: 1px solid var(--line); border-radius: 8px; background: var(--card); }
.score .big { font-size: 2.4rem; font-weight: 700; color: var(--accent); }
.review { padding-left: 1.5rem; }
.review .r-ok { color: var(--pos); }
.review .r-no { color: var(--neg); }
.btn-link { align-self: center; color: var(--accent); font-size: 0.9rem; margin-left: 0.5rem; }

/* ---------- checklist */
.checklist { list-style: none; padding: 0; }
.checklist > li { display: flex; gap: 0.6rem; align-items: flex-start; margin: 0.6rem 0; }
.checklist > li > .dot { margin-top: 0.3rem; }
.checklist ul { margin: 0.15rem 0 0; padding-left: 1.1rem; color: var(--fg); font-size: 0.92rem; }

/* ---------- K-map widget (extends kb.css) */
.kmap-tool h3 { margin-top: 0; }
.kw-map { flex: 0 0 auto; margin: 0 auto; }
.kw-res { font-weight: 600; }
.kmap-figure { overflow-x: auto; }

/* ---------- footer */
footer { display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap; }

@media (max-width: 480px) {
  body { padding: 1rem 16px 3rem; }
  header.page h1 { font-size: 1.6rem; }
  .task { padding-left: 2rem; padding-right: 0.75rem; }
  .task::before { left: 0.6rem; }
  .prob { padding: 0.75rem; }
  table.compact th, table.compact td { padding: 3px 7px; }
}

/* ---------- map views: no sidebar, a plain home link on top, and a switch between the two views */
body.no-side .kb-side { display: none; }
body.kb-side-page.no-side .kb-nav { display: block; }
@media (min-width: 901px) {
  body.kb-side-page.no-side { max-width: var(--kb-w); padding-left: 1.5rem; padding-top: 2rem; }
}
.views { display: flex; gap: 1.5rem; margin: -1rem 0 1.75rem; font-size: 0.95rem; }
.views a { color: var(--muted); text-decoration: none; }
.views a:hover { color: var(--accent); }
.views span { color: var(--accent); font-weight: 600; }

/* ---------- layer view: six rings, Information at the centre */
.ly { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 3rem; align-items: start; }
.ly-fig { position: sticky; top: 2rem; }
.lysvg { display: block; width: 100%; height: auto; max-width: 480px; font-family: inherit; }
.ring { cursor: pointer; outline: none; }
.ring .band { fill: none; stroke: var(--panel); transition: stroke .2s, fill .2s; }
.ring.alt .band { stroke: var(--line); }
.ring .band.core { fill: var(--panel); stroke: none; }
.ring text { font-size: 17px; fill: var(--fg); pointer-events: none; transition: fill .2s; }
.ring.empty text { fill: var(--muted); }
.ring:hover .band { stroke: var(--line-strong); }
.ring:hover .band.core { fill: var(--line-strong); }
.ring:hover text, .ring:focus-visible text { fill: var(--accent); }
.ring.on .band { stroke: var(--node-practiced); }
.ring.on .band.core { fill: var(--node-practiced); }
.ring.on text { fill: var(--accent); font-weight: 600; }
.ring:focus-visible text { text-decoration: underline; }

.ly-list { min-height: 8rem; }
.ly-name { font-size: 1.35rem; font-weight: 600; color: var(--accent); margin: 0 0 1rem; }
.ly-empty { color: var(--muted); }
.ly-mod { display: flex; justify-content: space-between; gap: 1rem; font-size: 0.85rem; color: var(--muted); margin: 1.5rem 0 0.4rem; }
.ly-name + .ly-mod { margin-top: 0; }
.ly-mod a { color: var(--accent); text-decoration: none; }
.ly-mod a:hover { text-decoration: underline; }
.ly-list ol { list-style: none; margin: 0; padding: 0; }
.ly-list li { margin: 0; padding: 0.2rem 0; }
.ly-list li a { color: var(--fg); text-decoration: none; display: inline-flex; gap: 0.6rem; align-items: center; }
.ly-list li a:hover { color: var(--accent); }
.ly-list .dot { width: 10px; height: 10px; border-width: 1px; }
.ly-list .s-practiced .dot::after, .ly-list .s-done .dot::after { content: none; }
.ly-list .stars { font-size: 0.8rem; margin-left: 0.2rem; }

.ly-more { display: flex; flex-wrap: wrap; gap: 0.25rem 1.25rem; font-size: 0.88rem; margin: 1.5rem 0 0; justify-content: center; }
.ly-more a { color: var(--muted); text-decoration: none; }
.ly-more a:hover { color: var(--accent); }

@media (max-width: 760px) {
  .ly { grid-template-columns: 1fr; gap: 2rem; }
  .ly-fig { position: static; }
  .lysvg { margin: 0 auto; }
  .ring text { font-size: 19px; }
}