/* =========================================================
   Zomniverse — Learn Documentation Home
   PATCH 2026-08-10 | FIXED STACKED DOCUMENTATION CARDS

   Owns only the registry-driven Documentation landing page.
   Cards use a fixed viewport so expanded release trees scroll
   internally without disturbing the surrounding grid.
========================================================= */

.learn-documentation-overview-page {
  width: min(100%, 1180px);
  max-width: 1180px;
  margin: 0 auto;
  padding: 8px 0 48px;
  box-sizing: border-box;
}


/* =========================================================
   PAGE HEADER
========================================================= */

.learn-documentation-overview-page > header {
  margin: 0 0 30px;
}

.learn-documentation-eyebrow {
  margin: 0 0 10px;
  color: #667085;
  font-size: 0.72rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.learn-documentation-overview-page > header h1 {
  margin: 0;
  color: #172033;
  font-size: clamp(1.8rem, 2.5vw, 2.35rem);
  font-weight: 750;
  line-height: 1.14;
  letter-spacing: -0.025em;
}

.learn-documentation-overview-page > header p:not(.learn-documentation-eyebrow) {
  max-width: 920px;
  margin: 16px 0 0;
  color: #647084;
  font-size: 0.95rem;
  line-height: 1.65;
}


/* =========================================================
   CARD GRID
========================================================= */

.learn-documentation-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: start;
  gap: 20px;
  margin-top: 26px;
}


/* =========================================================
   CATEGORY CARD

   Header ≈ 54px
   Body   ≈ five 56px document rows

   Expanded trees remain inside the scrollable body.
========================================================= */

.learn-documentation-card {
  --documentation-accent: #5367ff;
  --documentation-surface: #f7f9ff;

  position: relative;
  display: flex;
  flex-direction: column;

  height: 354px;
  min-width: 0;
  margin: 0;
  padding: 0;

  overflow: hidden;

  border: 1px solid #dfe5ee;
  border-radius: 14px;

  background: var(--documentation-surface);
  color: #172033;

  box-shadow:
    0 1px 2px rgba(15, 23, 42, 0.03),
    0 8px 24px rgba(15, 23, 42, 0.045);

  transition:
    border-color 160ms ease,
    box-shadow 160ms ease,
    transform 160ms ease;
}

.learn-documentation-card::before {
  content: "";
  position: absolute;
  z-index: 2;
  top: 0;
  left: 0;
  bottom: 0;

  width: 4px;

  background: var(--documentation-accent);
}

.learn-documentation-card:hover {
  border-color: #ccd5e2;

  box-shadow:
    0 2px 4px rgba(15, 23, 42, 0.035),
    0 12px 30px rgba(15, 23, 42, 0.065);

  transform: translateY(-1px);
}


/* =========================================================
   CARD FAMILIES
========================================================= */

.learn-documentation-card--0 {
  --documentation-accent: #5367ff;
  --documentation-surface: #f7f9ff;
}

.learn-documentation-card--1 {
  --documentation-accent: #7c5cff;
  --documentation-surface: #faf8ff;
}

.learn-documentation-card--2 {
  --documentation-accent: #3c9575;
  --documentation-surface: #f5fbf8;
}

.learn-documentation-card--3 {
  --documentation-accent: #cc8135;
  --documentation-surface: #fff9f3;
}


/* =========================================================
   CARD HEADER
========================================================= */

.learn-documentation-card h2 {
  flex: 0 0 auto;

  min-height: 54px;
  margin: 0;
  padding: 15px 18px 13px 20px;

  box-sizing: border-box;

  border-bottom: 1px solid rgba(148, 163, 184, 0.2);

  color: #172033;
  background: rgba(255, 255, 255, 0.44);

  font-size: 1rem;
  font-weight: 750;
  line-height: 1.3;
  letter-spacing: -0.012em;
}


/* =========================================================
   FIXED SCROLLING CARD BODY

   This is the important part:
   opening <details> never changes the outer card height.
========================================================= */

.learn-documentation-card > div {
  flex: 1 1 auto;
  min-height: 0;

  overflow-x: hidden;
  overflow-y: auto;

  scrollbar-gutter: stable;

  background: rgba(255, 255, 255, 0.2);
}

.learn-documentation-card > div::-webkit-scrollbar {
  width: 8px;
}

.learn-documentation-card > div::-webkit-scrollbar-track {
  background: transparent;
}

.learn-documentation-card > div::-webkit-scrollbar-thumb {
  border: 2px solid transparent;
  border-radius: 999px;

  background:
    rgba(100, 116, 139, 0.3)
    padding-box;
}

.learn-documentation-card > div::-webkit-scrollbar-thumb:hover {
  background:
    rgba(100, 116, 139, 0.48)
    padding-box;
}


/* =========================================================
   DOCUMENT ENTRY
========================================================= */

.learn-documentation-card details {
  margin: 0;
  padding: 0;

  border: 0;
  border-bottom: 1px solid rgba(148, 163, 184, 0.18);

  background: rgba(255, 255, 255, 0.52);
}

.learn-documentation-card details:last-child {
  border-bottom: 0;
}

.learn-documentation-card details[open] {
  background: rgba(255, 255, 255, 0.82);
}


/* =========================================================
   DOCUMENT SUMMARY
========================================================= */

.learn-documentation-card summary {
  position: relative;

  display: grid;
  grid-template-columns: 24px minmax(0, 1fr) auto;
  align-items: center;
  gap: 9px;

  min-height: 56px;
  margin: 0;
  padding: 8px 13px 8px 14px;

  box-sizing: border-box;

  list-style: none;
  cursor: pointer;

  color: #202a3a;

  font-size: 0.86rem;
  line-height: 1.32;

  transition:
    color 140ms ease,
    background-color 140ms ease;
}

.learn-documentation-card summary::-webkit-details-marker {
  display: none;
}

.learn-documentation-card summary::before {
  content: "›";

  display: grid;
  place-items: center;

  width: 20px;
  height: 20px;

  border: 1px solid #d6deea;
  border-radius: 50%;

  background: #ffffff;
  color: var(--documentation-accent);

  font-size: 1rem;
  font-weight: 800;
  line-height: 1;

  transition:
    transform 150ms ease,
    border-color 150ms ease,
    background-color 150ms ease;
}

.learn-documentation-card details[open] > summary::before {
  transform: rotate(90deg);

  border-color: color-mix(
    in srgb,
    var(--documentation-accent) 35%,
    #d6deea
  );

  background: #ffffff;
}

.learn-documentation-card summary:hover {
  color: #2938a4;
  background: rgba(255, 255, 255, 0.74);
}

.learn-documentation-card summary:focus-visible {
  outline: 2px solid rgba(83, 103, 255, 0.42);
  outline-offset: -2px;
}

.learn-documentation-card summary strong {
  min-width: 0;

  color: inherit;
  font-weight: 700;

  overflow-wrap: anywhere;
}


/* =========================================================
   VERSION BADGE
========================================================= */

.learn-documentation-card summary small {
  justify-self: end;

  margin: 0;
  padding: 3px 7px;

  border: 1px solid #dce3ec;
  border-radius: 999px;

  background: rgba(255, 255, 255, 0.88);
  color: #69768c;

  font-size: 0.66rem;
  font-weight: 750;
  line-height: 1.2;
  white-space: nowrap;
}


/* =========================================================
   EXPANDED DOCUMENT TREE
========================================================= */

.learn-documentation-card-tree {
  display: grid;
  gap: 2px;

  margin: 0 12px 12px 46px;
  padding: 8px 0 4px 12px;

  border-left: 2px solid
    color-mix(
      in srgb,
      var(--documentation-accent) 24%,
      #e2e8f0
    );

  background: transparent;
}

.learn-documentation-card-tree button {
  width: 100%;

  margin: 0;
  padding: 7px 9px;

  border: 0;
  border-radius: 6px;

  background: transparent;
  color: #536078;

  font: inherit;
  font-size: 0.8rem;
  line-height: 1.35;
  text-align: left;

  cursor: pointer;

  transition:
    color 130ms ease,
    background-color 130ms ease;
}

.learn-documentation-card-tree button:hover {
  color: #303bb5;
  background: rgba(83, 103, 255, 0.07);
}

.learn-documentation-card-tree button:focus-visible {
  outline: 2px solid rgba(83, 103, 255, 0.34);
  outline-offset: 1px;
}


/* =========================================================
   RESPONSIVE
========================================================= */

@media (max-width: 1050px) {
  .learn-documentation-overview-page {
    width: min(100%, 860px);
  }

  .learn-documentation-card-grid {
    grid-template-columns:
      repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  .learn-documentation-overview-page {
    width: 100%;
    padding-bottom: 28px;
  }

  .learn-documentation-overview-page > header {
    margin-bottom: 22px;
  }

  .learn-documentation-card-grid {
    grid-template-columns: 1fr;
    gap: 16px;
    margin-top: 22px;
  }

  .learn-documentation-card {
    height: 342px;
  }

  .learn-documentation-card h2 {
    min-height: 50px;
    padding:
      13px
      15px
      12px
      18px;
  }

  .learn-documentation-card summary {
    min-height: 54px;
  }
}


/* =========================================================
   REDUCED MOTION
========================================================= */

@media (prefers-reduced-motion: reduce) {
  .learn-documentation-card,
  .learn-documentation-card summary,
  .learn-documentation-card summary::before,
  .learn-documentation-card-tree button {
    transition: none;
  }
}

/* =========================================================
   PATCH 2026-08-10 | DOCUMENTATION ACCESSIBLE SCROLLBARS
   Keeps scrollable Documentation areas visibly discoverable
   while remaining thin and unobtrusive. Scrollbars disappear
   automatically when there is no overflow.
========================================================= */

/* Shared Firefox scrollbar treatment */
.learn-documentation-card > div,
#learn-md-content:has(.learn-documentation-overview-page) {
  scrollbar-width: thin;
  scrollbar-color:
    rgba(100, 116, 139, 0.42)
    transparent;
}


/* =========================================================
   CARD INTERNAL SCROLLBAR
========================================================= */

.learn-documentation-card > div {
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-gutter: stable;
}

.learn-documentation-card > div::-webkit-scrollbar {
  width: 6px;
}

.learn-documentation-card > div::-webkit-scrollbar-track {
  background: transparent;
}

.learn-documentation-card > div::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: rgba(100, 116, 139, 0.38);
}

.learn-documentation-card > div::-webkit-scrollbar-thumb:hover {
  background: rgba(79, 70, 229, 0.58);
}


/* =========================================================
   DOCUMENTATION OVERVIEW / MAIN LEARN SCROLLBAR
========================================================= */

#learn-md-content:has(.learn-documentation-overview-page) {
  overflow-y: auto;
}

#learn-md-content:has(.learn-documentation-overview-page)::-webkit-scrollbar {
  width: 7px;
}

#learn-md-content:has(.learn-documentation-overview-page)::-webkit-scrollbar-track {
  background: transparent;
}

#learn-md-content:has(.learn-documentation-overview-page)::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: rgba(100, 116, 139, 0.34);
}

#learn-md-content:has(.learn-documentation-overview-page)::-webkit-scrollbar-thumb:hover {
  background: rgba(79, 70, 229, 0.56);
}

/* =========================================================
   PATCH 2026-08-10 | DOCUMENTATION HOME TEXT CONTRAST
   Strengthens home-page labels and card headings while keeping
   the restrained pastel Documentation presentation.
========================================================= */

/* Page kicker */
.learn-documentation-overview-page .learn-documentation-eyebrow {
  color: #475569;
  opacity: 1;
  font-weight: 800;
}

/* Main page title */
.learn-documentation-overview-page > header h1 {
  color: #111827;
  opacity: 1;
}

/* Introductory description */
.learn-documentation-overview-page > header p:not(.learn-documentation-eyebrow) {
  color: #64748b;
  opacity: 1;
}

/* Category titles: Overview, Platform, Architecture, Modules, etc. */
.learn-documentation-overview-page .learn-documentation-card > h2 {
  color: #334155;
  opacity: 1;
  font-weight: 750;
}

/* Individual document names */
.learn-documentation-overview-page .learn-documentation-card summary {
  color: #1f2937;
  opacity: 1;
}

.learn-documentation-overview-page .learn-documentation-card summary strong {
  color: inherit;
  opacity: 1;
  font-weight: 700;
}

/* Version pills */
.learn-documentation-overview-page .learn-documentation-card summary small {
  color: #64748b;
  opacity: 1;
}

/* Expanded section/release links */
.learn-documentation-overview-page .learn-documentation-card-tree button {
  color: #526079;
  opacity: 1;
}

.learn-documentation-overview-page .learn-documentation-card-tree button:hover {
  color: #3730a3;
}

/* =========================================================
   PATCH 2026-08-11 | SMOOTH DOCUMENTATION CARD EXPANSION
   Adds a restrained open/close transition to Documentation
   card menus without changing their fixed-height layout.
========================================================= */

.learn-documentation-card details {
  interpolate-size: allow-keywords;
}

.learn-documentation-card details::details-content {
  block-size: 0;
  opacity: 0;
  overflow: hidden;

  transition:
    block-size 280ms cubic-bezier(.22, .61, .36, 1),
    opacity 180ms ease,
    content-visibility 280ms allow-discrete;
}

.learn-documentation-card details[open]::details-content {
  block-size: auto;
  opacity: 1;
}

/* Slightly soften the tree itself as it appears */
.learn-documentation-card details[open] .learn-documentation-card-tree {
  animation:
    learn-documentation-tree-enter
    260ms
    cubic-bezier(.22, .61, .36, 1);
}

@keyframes learn-documentation-tree-enter {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .learn-documentation-card details::details-content {
    transition: none;
  }

  .learn-documentation-card details[open] .learn-documentation-card-tree {
    animation: none;
  }
}