/* /project-details/: the system map and its sections. Every value comes from
   the DESIGN PASSPORT in CLAUDE.md (Project details passport). Shared tokens
   and the brand lockup come from design.css. */

/* Ambient pulse of light along the lines: one pass per period, linear. */
:root { --t-pulse: 4800ms; }

html { scroll-behavior: smooth; }

.details {
  width: min(1200px, calc(100vw - 48px));
  margin: 0 auto;
  padding: var(--sp-4) 0 var(--sp-8);
  background: var(--bg);
}

.details-head {
  display: grid;
  gap: var(--sp-3);
  margin-bottom: var(--sp-6);
}

.details-head .app-brand { justify-self: start; }

.details-title {
  margin: 0;
  font-size: var(--fs-32);
  font-weight: var(--fw-regular);
  line-height: 1.2;
  color: var(--ink);
}

.details-rev,
.det-line,
.det-text,
.details-foot p {
  margin: 0;
  font-size: var(--fs-20);
  font-weight: var(--fw-regular);
  line-height: 1.5;
  color: var(--ink-dim);
}

.det-text { color: var(--ink); max-width: 880px; }

/* View toggle: Full and Simplified, the modal's tab style. Without
   JavaScript the tabs are hidden and the full view stays. */
.view-tabs { display: none; margin-top: calc(var(--sp-1) * -1); }
.js .view-tabs { display: flex; }
.details [hidden] { display: none; }
.det-view.is-in { animation: view-in var(--t-mid) var(--ease); }

@keyframes view-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

/* Simplified: a HUD in this project's colours: backdrop grid, scan lines, corner brackets, mono
   uppercase labels, amber glow. details.js sets .is-hud on .details while the
   view shows; the page head wears the HUD in both views, so switching views
   never moves the tabs. Alpha forms and the mono family are in the passport. */
:root {
  --mono: var(--font);
}

.details.is-hud::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: linear-gradient(var(--hud-grid) 1px, transparent 1px), linear-gradient(90deg, var(--hud-grid) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 50% 0%, var(--bg) 20%, transparent 80%);
}

.details.is-hud::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  background: repeating-linear-gradient(0deg, var(--hud-scan) 0 1px, transparent 1px 3px);
}

.details.is-hud > * { position: relative; z-index: 1; }

/* The head, in both views. */
.details-title {
  font-family: var(--mono);
  font-weight: var(--fw-regular);
  letter-spacing: -0.01em;
  text-shadow: 0 0 16px var(--hud-glow-soft);
}

.details-rev {
  font-family: var(--mono);
  font-size: var(--fs-16);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.view-tabs.tabs {
  justify-self: start;
  gap: var(--sp-1);
  margin-top: 0;
  padding: var(--sp-1);
  background: var(--surface);
  border: 1px solid var(--hairline);
}

.view-tabs .tab {
  padding: var(--sp-1) var(--sp-2);
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  border: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}

.view-tabs .tab:hover { color: var(--ink); }
.view-tabs .tab:active { transform: none; }
.view-tabs .tab[aria-selected="true"] {
  color: var(--ink);
  border-color: var(--accent);
  box-shadow: 0 0 16px var(--hud-glow), inset 0 0 16px var(--hud-glow-soft);
}
.view-tabs .tab:focus-visible { outline: none; border-color: var(--ink); }

/* Panels: surface, hairline border, a 16px amber bracket at each corner. */
.simple-lead,
.simple-card,
.simple-limit {
  position: relative;
  background-color: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background-image:
    linear-gradient(var(--accent), var(--accent)), linear-gradient(var(--accent), var(--accent)),
    linear-gradient(var(--accent), var(--accent)), linear-gradient(var(--accent), var(--accent)),
    linear-gradient(var(--accent), var(--accent)), linear-gradient(var(--accent), var(--accent)),
    linear-gradient(var(--accent), var(--accent)), linear-gradient(var(--accent), var(--accent));
  background-repeat: no-repeat;
  background-size: 16px 1px, 1px 16px, 16px 1px, 1px 16px, 16px 1px, 1px 16px, 16px 1px, 1px 16px;
  background-position: 0 0, 0 0, 100% 0, 100% 0, 0 100%, 0 100%, 100% 100%, 100% 100%;
  animation: view-in var(--t-mid) var(--ease) both;
}

.simple { margin-bottom: var(--sp-8); }

.simple-lead {
  margin: 0 0 var(--sp-3);
  padding: var(--sp-3);
  font-family: var(--mono);
  font-size: var(--fs-24);
  font-weight: var(--fw-regular);
  line-height: 1.4;
  color: var(--ink);
  text-shadow: 0 0 16px var(--hud-glow-soft);
}

/* Each card spans two shared rows (head, points), so a title that wraps
   moves every card's points down together and the heads stay level. */
.simple-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-rows: auto auto;
  gap: var(--sp-3);
}

.simple-card {
  display: grid;
  grid-row: span 2;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-rows: subgrid;
  align-items: start;
  gap: var(--sp-3) var(--sp-2);
  padding: var(--sp-3);
}

.simple-card:nth-child(2) { animation-delay: var(--t-fast); }
.simple-card:nth-child(3) { animation-delay: calc(var(--t-fast) * 2); }

.simple-card .tile-key {
  display: inline-grid;
  place-items: center;
  width: 48px;
  height: 32px;
  font-family: var(--mono);
  letter-spacing: 0;
  border: 1px solid var(--accent);
  box-shadow: 0 0 16px var(--hud-glow), inset 0 0 16px var(--hud-glow-soft);
}

.simple-head {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-2);
  margin: 0;
  font-family: var(--mono);
  font-size: var(--fs-24);
  font-weight: var(--fw-regular);
  line-height: 32px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink);
}

/* Number box, icon and the title's first line share one 32px line; the
   icon box is as tall as the number box and the glyph sits centred in it. */
.simple-head .about-icon {
  height: 32px;
  color: var(--accent);
  filter: drop-shadow(0 0 8px var(--hud-glow));
}

.simple-card ul {
  grid-column: 1 / -1;
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--fs-20);
  font-weight: var(--fw-regular);
  line-height: 1.5;
  color: var(--ink-dim);
}

/* One row per point: an amber square, hairline between rows. Hover or focus
   shows the explanation as a readout over what follows, so nothing moves
   (stability passport). A tap focuses the point. */
.simple-card li {
  position: relative;
  padding: var(--sp-1) 0 var(--sp-1) var(--sp-3);
  border-top: 1px solid var(--hairline);
  cursor: crosshair;
  outline: none;
  transition: color var(--t-fast) var(--ease);
}

.simple-card li:first-child { border-top-color: transparent; }

.simple-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: var(--sp-2);
  width: 8px;
  height: 8px;
  background: var(--accent);
  box-shadow: 0 0 8px var(--hud-glow);
  transition: box-shadow var(--t-fast) var(--ease);
}

.simple-card li:hover,
.simple-card li:focus-visible { z-index: 2; color: var(--ink); }

.simple-card li:hover::before,
.simple-card li:focus-visible::before { box-shadow: 0 0 16px var(--accent); }

.simple-card li:focus-visible .point { outline: 1px solid var(--accent); outline-offset: 4px; }

.hint {
  position: absolute;
  top: calc(100% + var(--sp-1));
  left: 0;
  right: 0;
  display: grid;
  gap: var(--sp-2);
  padding: var(--sp-2);
  background: var(--bg);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  box-shadow: 0 0 16px var(--hud-glow-soft);
  color: var(--ink);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  pointer-events: none;
  transition: opacity var(--t-fast) var(--ease), transform var(--t-fast) var(--ease), visibility 0s linear var(--t-fast);
}

.simple-card li:hover .hint,
.simple-card li:focus-visible .hint {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition: opacity var(--t-fast) var(--ease), transform var(--t-fast) var(--ease), visibility 0s;
}

/* One readout at a time. A point opens on
   hover or keyboard focus only; a mouse click leaves no open readout behind,
   and while the pointer is on a point every other readout closes at once. */
.simple-grid:has(li:hover) li:not(:hover) { z-index: auto; color: var(--ink-dim); }
.simple-grid:has(li:hover) li:not(:hover)::before { box-shadow: 0 0 8px var(--hud-glow); }
.simple-grid:has(li:hover) li:not(:hover) .hint { opacity: 0; visibility: hidden; transition: none; }
.simple-card li:hover { z-index: 3; }

/* Mouse hover: details.js places the readout beside the pointer, point-wide,
   inside the window. The hovered card rises so the readout covers its
   neighbours. */
.simple-card li.at-pointer .hint {
  top: var(--hint-y);
  left: var(--hint-x);
  right: auto;
  width: var(--hint-w);
}

.simple-card:has(li:hover) { z-index: 1; }

.hint-line { display: block; }

/* Where each step happens heads its line. */
.hint-where {
  display: block;
  font-family: var(--mono);
  font-size: var(--fs-16);
  font-weight: var(--fw-regular);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
}

@media (prefers-reduced-motion: reduce) {
  .hint { transform: none; }
}

.simple-limit {
  margin: var(--sp-3) 0 0;
  padding: var(--sp-3);
  font-family: var(--mono);
  font-size: var(--fs-20);
  font-weight: var(--fw-regular);
  line-height: 1.5;
  color: var(--ink-dim);
  animation-delay: calc(var(--t-fast) * 3);
}

/* Legend: three line samples, one per kind of flow. */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-1) var(--sp-4);
  margin: 0 0 var(--sp-6);
  padding: 0;
  list-style: none;
  font-size: var(--fs-16);
  font-weight: var(--fw-regular);
  line-height: 1.5;
  color: var(--ink-dim);
}

.legend li {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.legend-line {
  display: block;
  width: 32px;
  height: 0;
  border-top: 1px solid var(--accent);
}

.legend-line.pt { border-top: 1px dotted var(--ink); }
.legend-line.meta { border-top: 1px dashed var(--ink-dim); }

/* The map: a 4-column grid of tiles with the lines drawn over the gaps.
   Tiles are sized by their largest state from first paint. */
.map {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  grid-template-areas:
    "a r r b"
    "c1 e s c2"
    ". w w .";
  gap: var(--sp-6) var(--sp-4);
  margin-bottom: var(--sp-8);
}

.map-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}

.tile-a { grid-area: a; }
.tile-r { grid-area: r; }
.tile-b { grid-area: b; }
.tile-c1 { grid-area: c1; }
.tile-e { grid-area: e; }
.tile-s { grid-area: s; }
.tile-c2 { grid-area: c2; }
.tile-w { grid-area: w; }

.tile {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-rows: auto auto 1fr;
  gap: var(--sp-1);
  min-height: 176px;
  padding: var(--sp-3);
  color: var(--ink);
  text-decoration: none;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  box-shadow: 0 0 0 0 rgb(240 169 64 / 0);
  transition: border-color var(--t-fast) var(--ease), box-shadow var(--t-mid) var(--ease), opacity var(--t-mid) var(--ease);
}

.tile-key {
  font-size: var(--fs-16);
  font-weight: var(--fw-regular);
  line-height: 1.5;
  letter-spacing: 2px;
  color: var(--accent);
}

.tile-name {
  font-size: var(--fs-24);
  font-weight: var(--fw-regular);
  line-height: 1.2;
  color: var(--ink);
  transition: color var(--t-fast) var(--ease);
}

.tile-line {
  font-size: var(--fs-20);
  font-weight: var(--fw-regular);
  line-height: 1.5;
  color: var(--ink-dim);
}

.tile:hover,
.tile.is-lit {
  border-color: var(--accent);
  box-shadow: 0 0 32px 0 rgb(240 169 64 / 0.25);
}

.tile:hover .tile-name,
.tile.is-lit .tile-name { color: var(--accent); }
.tile.is-near { border-color: var(--ink-dim); }
.map.is-focus .tile:not(.is-lit):not(.is-near) { opacity: 0.6; }
.tile:focus-visible { outline: 1px solid var(--accent); outline-offset: 4px; }

/* Lines: a base stroke per kind, an arrowhead, and a pulse of light that
   travels the same path. Hovering a tile lights the lines that touch it. */
.edge { fill: none; stroke-width: 1; transition: opacity var(--t-mid) var(--ease), stroke var(--t-fast) var(--ease); }
.edge.ct { stroke: var(--accent); }
.edge.pt { stroke: var(--ink); stroke-dasharray: 1 4; stroke-linecap: round; }
.edge.meta { stroke: var(--ink-dim); stroke-dasharray: 6 6; }
.map.is-focus .edge:not(.is-lit),
.map.is-focus .pulse:not(.is-lit),
.map.is-focus .edge-label:not(.is-lit) { opacity: 0.25; }
.edge.is-lit { stroke: var(--accent); }

.pulse {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-dasharray: 0.08 1;
  stroke-dashoffset: 1.08;
  animation: pulse var(--t-pulse) linear infinite;
  transition: opacity var(--t-mid) var(--ease);
}

.pulse.pt { stroke: var(--ink); }
.pulse.meta { stroke: var(--ink-dim); }
.pulse.is-lit { stroke: var(--accent-hover); }

@keyframes pulse {
  from { stroke-dashoffset: 1.08; }
  to { stroke-dashoffset: 0; }
}

.arrow.ct { fill: var(--accent); }
.arrow.pt { fill: var(--ink); }
.arrow.meta { fill: var(--ink-dim); }

.edge-label {
  font-family: var(--font);
  font-size: var(--fs-16);
  font-weight: var(--fw-regular);
  fill: var(--ink-dim);
  transition: opacity var(--t-mid) var(--ease), fill var(--t-fast) var(--ease);
}

.edge-label.is-lit { fill: var(--accent); }

/* Sections: one per map tile, then the ledger. */
.det {
  padding-top: var(--sp-4);
  margin-bottom: var(--sp-8);
  border-top: 1px solid var(--hairline);
  scroll-margin-top: var(--sp-4);
}

.det-head {
  display: grid;
  gap: var(--sp-1);
  margin-bottom: var(--sp-3);
}

.det-title {
  margin: 0;
  font-size: var(--fs-24);
  font-weight: var(--fw-regular);
  line-height: 1.2;
  color: var(--ink);
  transition: color var(--t-mid) var(--ease);
}

.det:target .det-title { color: var(--accent); }

.det-text { margin-bottom: var(--sp-4); }

/* Sub-tiles: the technical layer. Each opens in place; siblings keep their
   own height (align-items: start), so opening one stretches nothing beside it. */
.subs {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: var(--sp-3);
  align-items: start;
}

.ledger .subs { grid-template-columns: minmax(0, 1fr); }

.sub {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  transition: border-color var(--t-fast) var(--ease), box-shadow var(--t-mid) var(--ease);
}

.sub:hover { border-color: var(--ink-dim); }
.sub[open] { border-color: var(--accent); }
.sub[open]:hover { box-shadow: 0 0 32px 0 rgb(240 169 64 / 0.15); }

.sub-head {
  position: relative;
  display: block;
  min-height: 48px;
  padding: var(--sp-2) var(--sp-6) var(--sp-2) var(--sp-3);
  font-size: var(--fs-20);
  font-weight: var(--fw-regular);
  line-height: 1.5;
  color: var(--ink);
  list-style: none;
  cursor: pointer;
  transition: color var(--t-fast) var(--ease);
}

.sub-head::-webkit-details-marker { display: none; }
.sub-head:hover { color: var(--accent); }
.sub-head:focus-visible { outline: 1px solid var(--accent); outline-offset: -4px; }

/* A drawn plus on the right that turns into a cross when open. */
.sub-head::before,
.sub-head::after {
  content: "";
  position: absolute;
  top: 24px;
  right: var(--sp-3);
  width: 16px;
  height: 1px;
  background: currentColor;
  transition: transform var(--t-fast) var(--ease);
}

.sub-head::after { transform: rotate(90deg); }
.sub[open] .sub-head::before { transform: rotate(45deg); }
.sub[open] .sub-head::after { transform: rotate(-45deg); }

.js .sub-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--t-mid) var(--ease);
}

.js .sub.is-open .sub-body { grid-template-rows: 1fr; }
.js .sub-inner { min-height: 0; overflow: hidden; opacity: 0; transition: opacity var(--t-mid) var(--ease); }
.js .sub.is-open .sub-inner { opacity: 1; }

.sub-inner > ul,
.sub-inner > p {
  margin: 0;
  padding: 0 var(--sp-3) var(--sp-3);
  font-size: var(--fs-20);
  font-weight: var(--fw-regular);
  line-height: 1.5;
  color: var(--ink-dim);
  overflow-wrap: anywhere;
}

.sub-inner > ul { display: grid; gap: var(--sp-1); padding-left: var(--sp-6); list-style: square; }
.sub-inner > ul li::marker { color: var(--accent); }

.ledger-tag {
  display: inline-block;
  min-width: 96px;
  margin-right: var(--sp-2);
  letter-spacing: 2px;
  color: var(--accent);
}

.ledger-col {
  display: block;
  font-weight: var(--fw-regular);
  color: var(--ink);
}

.details-foot a,
.det-text a {
  color: inherit;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  text-decoration-color: var(--ink-dim);
  transition: color var(--t-fast) var(--ease), text-decoration-color var(--t-fast) var(--ease);
}

.details-foot a:hover,
.det-text a:hover { color: var(--accent); text-decoration-color: var(--accent); }

@media (max-width: 900px) {
  .details { width: calc(100vw - 32px); padding-top: var(--sp-3); }
  .map {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "a" "c1" "e" "s" "r" "c2" "b" "w";
    gap: var(--sp-2);
  }
  .map-lines { display: none; }
  .tile { min-height: 0; }
  .subs { grid-template-columns: minmax(0, 1fr); }
  .simple-grid { grid-template-columns: minmax(0, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .pulse { display: none; }
}