/* ============================================================== base ==== */

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background: var(--glow);
  pointer-events: none;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 0;
}
p { margin: 0; }
ul, ol { margin: 0; padding: 0; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.ico { width: 1em; height: 1em; flex: 0 0 auto; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.gradient-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.wrap { width: min(100% - 2rem, var(--maxw)); margin-inline: auto; }

/* ============================================================ chrome ==== */

.topbar {
  position: sticky;
  top: 0;
  z-index: 60;
  height: var(--chrome);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-inline: clamp(0.75rem, 2vw, 1.25rem);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.98rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.topbar-brand .dot { color: var(--accent); }

.crumbs {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  min-width: 0;
  flex: 1;
  color: var(--muted);
  font-size: 0.86rem;
}
.crumbs a { color: var(--muted); }
.crumbs a:hover { color: var(--text); }
.crumbs .ico { width: 0.85em; opacity: 0.5; }
.crumbs .crumb-now {
  color: var(--text);
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-actions { display: flex; align-items: center; gap: 0.4rem; }

/* ========================================================== controls ==== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.62rem 1.05rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.9rem;
  border: 1px solid transparent;
  background: none;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.16s var(--ease), background 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }

.btn-primary {
  background: var(--grad);
  color: var(--on-accent);
  box-shadow: 0 10px 26px -12px rgba(255, 138, 61, 0.7);
}
.btn-ghost { background: var(--card); border-color: var(--line-2); color: var(--text); }
.btn-ghost:hover { background: var(--card-3); border-color: var(--line-3); }
.btn-quiet { color: var(--muted); }
.btn-quiet:hover { color: var(--text); background: var(--card); }
.btn-danger { background: var(--danger-wash); border-color: var(--danger); color: var(--danger); }
.btn-sm { padding: 0.4rem 0.75rem; font-size: 0.82rem; }
.btn-block { width: 100%; }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--muted);
  cursor: pointer;
  font-size: 1.05rem;
  transition: color 0.18s, border-color 0.18s, background 0.18s;
}
.icon-btn:hover { color: var(--text); border-color: var(--line-3); background: var(--card-3); }
.icon-btn.is-on { color: var(--on-accent); background: var(--grad); border-color: transparent; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  background: var(--card-2);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 500;
}
.chips { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--on-accent);
  background: var(--grad);
  padding: 0.26rem 0.62rem;
  border-radius: 999px;
}
.pill.ghost {
  background: var(--accent-wash);
  color: var(--accent-ink);
  border: 1px solid var(--line-2);
}
.pill.ok { background: var(--ok-wash); color: var(--ok-ink); border: 1px solid var(--ok-wash); }

.field { display: grid; gap: 0.35rem; margin-bottom: 0.9rem; }
.field > label { font-size: 0.8rem; font-weight: 600; color: var(--muted); }
.field .hint { font-size: 0.76rem; color: var(--muted-2); }

input[type="text"], input[type="url"], input[type="number"], select, textarea {
  width: 100%;
  padding: 0.62rem 0.75rem;
  border-radius: var(--radius-xs);
  border: 1px solid var(--line-2);
  background: var(--card-2);
  color: var(--text);
  transition: border-color 0.18s, background 0.18s;
}
input:focus, select:focus, textarea:focus {
  border-color: var(--accent);
  outline: none;
  background: var(--card);
}
textarea { resize: vertical; min-height: 96px; font-family: inherit; line-height: 1.55; }
textarea.mono { font-family: var(--font-mono); font-size: 0.85rem; }

.switch { display: inline-flex; align-items: center; gap: 0.5rem; cursor: pointer; font-size: 0.85rem; }
.switch input { width: auto; accent-color: var(--accent); }

.row { display: flex; gap: 0.6rem; flex-wrap: wrap; align-items: center; }
.row-end { justify-content: flex-end; }
.grow { flex: 1; min-width: 0; }

/* ======================================================= progress bar ==== */

.meter {
  position: relative;
  height: 8px;
  border-radius: 999px;
  background: var(--card-3);
  overflow: hidden;
  border: 1px solid var(--line);
}
.meter > i {
  display: block;
  height: 100%;
  background: var(--grad);
  border-radius: 999px;
  transition: width 0.5s var(--ease);
}

/* The SWG skill-points readout, segmented like the original. */
.points-bar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.78rem;
  color: var(--muted);
}
.points-bar .points-track {
  position: relative;
  flex: 1;
  min-width: 90px;
  height: 12px;
  border: 1px solid var(--line-2);
  border-radius: 4px;
  background: var(--card-3);
  overflow: hidden;
}
.points-bar .points-fill {
  height: 100%;
  background: var(--grad);
  transition: width 0.5s var(--ease);
}
.points-bar .points-track::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    90deg,
    transparent 0 6px,
    color-mix(in srgb, var(--bg) 70%, transparent) 6px 8px
  );
  pointer-events: none;
}
.points-bar b { color: var(--text); font-variant-numeric: tabular-nums; font-weight: 700; }

.tree-progress { display: flex; align-items: center; gap: 0.6rem; font-size: 0.8rem; }
.tree-progress .meter { flex: 1; min-width: 80px; }
.tree-progress b { color: var(--text); font-variant-numeric: tabular-nums; }

/* The tier ladder, stated once per tree instead of on every box. */
.tier-legend {
  display: flex;
  gap: 0.9rem;
  list-style: none;
  flex-wrap: wrap;
  font-size: 0.72rem;
  color: var(--muted-2);
}
.tier-legend li { display: flex; align-items: baseline; gap: 0.3rem; white-space: nowrap; }
.tier-legend b {
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--accent-ink);
  min-width: 1.3em;
  text-align: right;
}

.tier-ladder {
  display: grid;
  gap: 0.3rem;
  padding: 0.7rem 0.85rem;
  border-radius: var(--radius-xs);
  border: 1px dashed var(--line-2);
  background: var(--card-3);
  font-size: 0.8rem;
  color: var(--muted);
}
.tier-ladder b { color: var(--accent-ink); display: inline-block; min-width: 2.2em; }

.chip-level { border-color: var(--accent); color: var(--accent-ink); background: var(--accent-wash); }

/* ============================================================ browse ==== */

.view { padding-block: clamp(1.5rem, 4vh, 2.75rem) 4rem; }

.page-head { margin-bottom: clamp(1.5rem, 4vh, 2.4rem); }
.page-head .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-ink);
  margin-bottom: 0.6rem;
}
.page-head h1 { font-size: clamp(1.7rem, 4.5vw, 2.6rem); margin-bottom: 0.6rem; }
.page-head p { color: var(--muted); max-width: 62ch; }

/* The time-per-tier ladder on the catalogue page: what each rung costs,
   stated up front so nobody discovers it three modules in. */
.time-ladder {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 1rem;
}
.tl-item {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0.32rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--card-2);
  font-size: 0.76rem;
  color: var(--muted);
}
.tl-item b {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--accent-ink);
}
.tl-item i { font-style: normal; color: var(--muted-2); font-variant-numeric: tabular-nums; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr));
  gap: clamp(0.8rem, 2vw, 1.2rem);
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  padding: clamp(1.1rem, 2.4vw, 1.5rem);
  border-radius: var(--radius);
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s var(--ease), border-color 0.2s, box-shadow 0.2s;
  text-align: left;
  cursor: pointer;
  width: 100%;
  font: inherit;
}
.card:hover { transform: translateY(-3px); border-color: var(--line-3); box-shadow: var(--shadow); }
.card h3 { font-size: 1.12rem; }
.card p { color: var(--muted); font-size: 0.9rem; }
.card .card-foot {
  margin-top: auto;
  padding-top: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-size: 0.78rem;
  color: var(--muted-2);
}
.card-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 0.75rem; }

/* ========================================================= catalogue ==== */

/*
 * One page for the whole hierarchy: section > sub-section > tree, collapsed by
 * default. Rows rather than cards, because a card spent a lot of vertical space
 * to show a name and a count and then charged a navigation to see inside.
 */
.catalogue { display: flex; flex-direction: column; gap: 0.7rem; }

.cat-sec {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  overflow: hidden;
  transition: border-color 0.2s;
}
.cat-sec.is-open { border-color: var(--line-3); }

.cat-head {
  display: grid;
  grid-template-columns: auto 1fr auto minmax(60px, 130px) auto;
  align-items: center;
  gap: 0.85rem;
  width: 100%;
  padding: 0.95rem 1.1rem;
  background: none;
  border: 0;
  cursor: pointer;
  text-align: left;
  color: var(--text);
  transition: background 0.18s;
}
.cat-head:hover { background: var(--card-3); }
.cat-chevron { display: inline-flex; color: var(--muted-2); transition: transform 0.26s var(--ease); }
.cat-sec.is-open .cat-chevron { transform: rotate(0deg); }
.cat-sec:not(.is-open) .cat-chevron { transform: rotate(-90deg); }
.cat-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.cat-meta { font-size: 0.78rem; color: var(--muted-2); white-space: nowrap; }
.cat-bar {
  height: 6px;
  border-radius: 999px;
  background: var(--card-3);
  border: 1px solid var(--line);
  overflow: hidden;
}
.cat-bar > i { display: block; height: 100%; background: var(--grad); transition: width 0.5s var(--ease); }
.cat-count {
  font-size: 0.78rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* The 1fr -> 0fr collapse sizes only the FIRST row, so the panel must have
   exactly one child. Everything lives in .cat-panel-inner for that reason. */
.cat-panel {
  display: grid;
  grid-template-rows: 1fr;
  transition: grid-template-rows 0.3s var(--ease), opacity 0.22s, padding 0.3s var(--ease);
  padding: 0 1.1rem 1.1rem;
  border-top: 1px solid var(--line);
}
.cat-panel-inner { min-height: 0; }
.cat-sec:not(.is-open) .cat-panel {
  grid-template-rows: 0fr;
  opacity: 0;
  padding-block: 0;
  border-top-color: transparent;
  overflow: hidden;
}
.cat-blurb { color: var(--muted); font-size: 0.9rem; padding-top: 0.9rem; }
.cat-tools { padding-top: 0.9rem; }

.cat-group { padding-top: 1rem; }
.cat-group-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}
.cat-group-name {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-ink);
}
.cat-group-count {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--muted-2);
  background: var(--card-3);
  border-radius: 999px;
  padding: 0.08rem 0.4rem;
}
.cat-group-blurb { margin-bottom: 0.5rem; }
.cat-group-empty { padding: 0.3rem 0 0.2rem; }

/* ---- tree rows ---- */

.tree-rows { display: flex; flex-direction: column; gap: 0.35rem; }

.tree-row {
  position: relative;
  display: flex;
  align-items: stretch;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--card-2);
  transition: border-color 0.18s, background 0.18s, transform 0.18s var(--ease);
}
.tree-row:hover { border-color: var(--accent); background: var(--card-3); transform: translateX(2px); }
.tree-row.is-done { border-color: var(--ok); }

/*
 * Six columns for five guaranteed children plus one optional (skill points).
 * A spare auto column collapses to zero width when unused, whereas a missing
 * one silently wraps the extra child onto a second row and makes that one row
 * taller than every other.
 *
 * Do NOT try to pin that shut with grid-auto-rows: the rows here are implicit,
 * so sizing them to 0 collapses the only row there is and crushes the content.
 * Having enough columns is the whole fix.
 */
.tree-row-link {
  flex: 1;
  min-width: 0;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto minmax(50px, 96px) auto auto;
  align-items: center;
  gap: 0.8rem;
  padding: 0.6rem 0.85rem;
}
.tr-mark { display: inline-flex; color: var(--muted-2); font-size: 0.95rem; }
.tree-row.is-done .tr-mark { color: var(--ok-ink); }
.tr-body { min-width: 0; display: grid; }
.tr-name {
  font-weight: 600;
  font-size: 0.92rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.tr-sub {
  font-size: 0.74rem;
  color: var(--muted-2);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.tr-shape { font-size: 0.74rem; color: var(--muted-2); white-space: nowrap; }
.tr-bar {
  height: 5px;
  border-radius: 999px;
  background: var(--card-3);
  border: 1px solid var(--line);
  overflow: hidden;
}
.tr-bar > i { display: block; height: 100%; background: var(--grad); transition: width 0.5s var(--ease); }
.tr-count {
  font-size: 0.76rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.tr-pts { font-size: 0.72rem; color: var(--muted-2); font-variant-numeric: tabular-nums; }
.tr-tools { display: flex; align-items: center; gap: 0.2rem; padding-right: 0.5rem; }

@media (max-width: 760px) {
  .cat-head { grid-template-columns: auto 1fr auto; gap: 0.6rem; padding: 0.85rem 0.9rem; }
  .cat-meta, .cat-bar { display: none; }
  .cat-panel { padding-inline: 0.9rem; }
  .tree-row-link { grid-template-columns: auto minmax(0, 1fr) auto auto; gap: 0.6rem; }
  .tr-shape, .tr-bar { display: none; }
}

.empty {
  text-align: center;
  padding: clamp(2.5rem, 8vh, 5rem) 1.5rem;
  border: 1px dashed var(--line-2);
  border-radius: var(--radius);
  color: var(--muted);
  background: var(--card-2);
}
.empty h3 { margin-bottom: 0.5rem; color: var(--text); }
.empty .btn { margin-top: 1.1rem; }

.banner {
  display: flex;
  gap: 0.7rem;
  align-items: flex-start;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-2);
  background: var(--card-2);
  font-size: 0.86rem;
  color: var(--muted);
  margin-bottom: 1.25rem;
}
.banner.warn { border-color: var(--warn); background: color-mix(in srgb, var(--warn) 10%, transparent); }
.banner.danger { border-color: var(--danger); background: var(--danger-wash); color: var(--danger); }
.banner .ico { color: var(--warn); margin-top: 0.2rem; }

/* ======================================================== tree view ==== */

.view-tree {
  height: calc(100dvh - var(--chrome));
  display: flex;
  flex-direction: column;
  padding: clamp(0.6rem, 1.6vh, 1.1rem) clamp(0.75rem, 2vw, 1.5rem) clamp(0.75rem, 2vh, 1.25rem);
  gap: clamp(0.5rem, 1.4vh, 1rem);
  overflow: hidden;
}

.tree-head {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.tree-head h1 {
  font-size: clamp(1.05rem, 2.4vh, 1.5rem);
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  flex-wrap: wrap;
}
.tree-head .tree-sub { font-size: 0.8rem; color: var(--muted); font-weight: 500; font-family: var(--font-sans); }
.tree-head-right { display: flex; align-items: center; gap: 0.9rem; min-width: min(320px, 100%); }

.lattice {
  --tgap: clamp(0.35rem, 1.1vh, 0.8rem);
  /* Boxes are capped rather than stretched to fill. Without this, a shallow
     tree on a tall screen produces enormous blocks with three words in them. */
  --box-max: clamp(52px, 8vh, 76px);
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: var(--tgap);
  justify-content: center;
}

.lattice-cap {
  position: relative;
  flex: 0 0 auto;
  display: flex;
  justify-content: center;
  height: var(--box-max);
}
/*
 * Connectors.
 *
 * The branch turns HALFWAY between a cap and the boxes, not a few pixels off
 * the cap. That distance is not knowable in CSS: the band stretches to the
 * viewport while the boxes are capped and centred inside it, so the gap changes
 * with the window. view-tree.js measures it after layout and publishes it as
 * --gap-top / --gap-bottom; everything here is expressed as half of those.
 *
 * 2px rather than a hairline: at this scale a 1px line reads as a rendering
 * artefact rather than a drawn connector.
 */
.lattice { --gap-top: 0px; --gap-bottom: 0px; --wire: 2px; }

.lattice-cap::after {
  content: "";
  position: absolute;
  left: calc(50% / var(--cols));
  right: calc(50% / var(--cols));
  height: var(--wire);
  border-radius: var(--wire);
  background: var(--connector);
}
.lattice-cap.is-master::after { bottom: calc(var(--gap-top) / -2); }
.lattice-cap.is-novice::after { top: calc(var(--gap-bottom) / -2); }

/* The stub joining the cap box to its rail. It lives on the container, not on
   the box: the box clips its own overflow to keep long titles in bounds, which
   would swallow a stub drawn there. */
.lattice-cap::before {
  content: "";
  position: absolute;
  left: calc(50% - var(--wire) / 2);
  width: var(--wire);
  border-radius: var(--wire);
  background: var(--connector);
}
.lattice-cap.is-master::before {
  bottom: calc(var(--gap-top) / -2);
  height: calc(var(--gap-top) / 2);
}
.lattice-cap.is-novice::before {
  top: calc(var(--gap-bottom) / -2);
  height: calc(var(--gap-bottom) / 2);
}

.lattice-cap .mbox { width: min(340px, 60%); }

.lattice-band {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: repeat(var(--cols), minmax(0, 1fr));
  gap: var(--tgap);
}

/* The column stretches to fill the band so its spine can reach both rails. */
.lattice-col {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 0;
}
/*
 * The spine hangs off .col-boxes, not .lattice-col.
 *
 * .lattice-col stretches to the whole band, but the boxes are capped and
 * centred inside it, so a spine anchored to the column would start well above
 * the top box and overshoot the rail. Anchoring it to the boxes and extending
 * half a gap in each direction lands it exactly on both rails.
 */
.col-boxes::before {
  content: "";
  position: absolute;
  left: calc(50% - var(--wire) / 2);
  top: calc(var(--gap-top) / -2);
  bottom: calc(var(--gap-bottom) / -2);
  width: var(--wire);
  border-radius: var(--wire);
  background: var(--connector);
  z-index: 0;
}

/*
 * The boxes sit in their own centred wrapper. Rows are 1fr so they divide
 * whatever height the wrapper actually gets, and the wrapper is capped at the
 * height the boxes want. Overflow is therefore impossible: on a tall screen the
 * cap wins and the boxes stay small, on a short one the band wins and they
 * shrink. Capping the tracks themselves would let them spill, since
 * align-content cannot shrink a track below its max.
 */
.col-boxes {
  position: relative;
  /* flex:1 so it grows to the band; max-height then caps it. Without the grow it
     would collapse to content height and the boxes would never reach full size. */
  flex: 1 1 auto;
  width: 100%;
  min-height: 0;
  display: grid;
  grid-template-rows: repeat(var(--tiers), minmax(0, 1fr));
  gap: var(--tgap);
  max-height: calc(var(--tiers) * var(--box-max) + (var(--tiers) - 1) * var(--tgap));
}

/* Column names are hidden on the desktop lattice, exactly as in the game: the
   box titles carry the meaning and a label row would break the connector rail.
   Mobile stacks the columns, where a heading genuinely helps, so it returns. */
.col-label {
  display: none;
  position: absolute;
  inset: auto 0 100% 0;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted-2);
  text-align: center;
  padding-bottom: 0.25rem;
  pointer-events: none;
}

/* ------------------------------------------------------- module boxes -- */

.mbox {
  position: relative;
  z-index: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.1rem;
  padding: 0.3rem clamp(0.4rem, 0.9vw, 0.7rem);
  border-radius: var(--radius-sm);
  border: 1px solid var(--box-line);
  background: var(--box-bg);
  color: var(--box-text);
  text-align: center;
  cursor: pointer;
  overflow: hidden;
  font: inherit;
  transition: transform 0.16s var(--ease), border-color 0.2s, background 0.2s, box-shadow 0.2s;
}
.mbox:hover { background: var(--box-bg-hover); border-color: var(--accent); transform: translateY(-1px); }

/* ================================================== the tier-pill system == */

/*
 * A rarity ladder, built entirely from CSS layers so it survives any width.
 *
 * RESPONSIVE STRATEGY
 *
 * 1. The calm content zone is carved by a MASK, not by pixel offsets. One
 *    linear-gradient mask in percentages keeps the left ~55% clear of every
 *    decorative layer at any width, so a title can never collide with geometry.
 * 2. Diagonals come from repeating-linear-gradient. A gradient's ANGLE is
 *    absolute, so the lines cannot shear as the box's ratio changes, which is
 *    exactly what a stretched background image would do. The line COUNT comes
 *    from constraining that layer's paint box to bands x pitch, anchored right.
 * 3. The tier glyph scales with clamp() against height, never width, so a wide
 *    card does not get a fat letter.
 * 4. Container queries simplify the design when the pill gets narrow: smaller
 *    glyph, geometry pushed further right, dots dropped. Content text is never
 *    shrunk to protect decoration.
 *
 * COLOUR AND STATE
 *
 * Rarity colour is decorative; the app's state colour is functional and has to
 * win. So the tier tint always shows in the interior (glow, lines, glyph) while
 * the BORDER only takes the tier colour in the neutral state. Available stays
 * orange and complete stays green, because those mean something.
 */

.tier-pill {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  container-type: inline-size;

  /*
   * Each decorative layer carries its OWN alpha rather than being dimmed
   * wholesale by one opacity on the layer. Dimming the whole layer to calm the
   * lines also killed the glow, and dialling the glow back up brought the lines
   * with it. Separate alphas mean the lines can be a whisper while the wash
   * stays readable, which is the difference between "textured" and "striped".
   */
  --t-ink: #7c8aa5;          /* the tier hue, for the wash and the glow */
  --t-line: rgba(124, 138, 165, 0.1);  /* the diagonals, deliberately faint */
  --t-wash: transparent;     /* soft gradient where the dot pattern used to be */
  --t-glow: transparent;     /* interior light from the top-right */
  --t-edge: rgba(255, 255, 255, 0.14);
  --t-mark: linear-gradient(115deg, #9fb0cc, #6d7d99);
  --bands: 1;
  --pitch: 13px;
  /* Dialled back 20% from 0.9. This scales the wash, the diagonals and the glow
     together, so the balance between them is unchanged. */
  --geo-alpha: 0.72;
  --mark-alpha: 0.16;
}

.tier-pill > * { position: relative; z-index: 1; }

/* ------------------------------------------------------- the six tiers -- */

.tier-pill[data-tier="novice"] {
  --t-ink: #8493ad;
  --t-line: rgba(132, 147, 173, 0.085);
  --t-wash: radial-gradient(58% 120% at 78% 52%, rgba(132, 147, 173, 0.07), transparent 72%);
  --t-glow: radial-gradient(120% 150% at 104% -20%, rgba(132, 147, 173, 0.08), transparent 62%);
  --t-edge: rgba(132, 147, 173, 0.22);
  --t-mark: linear-gradient(115deg, #b6c4dc, #6d7d99);
  --bands: 1;
  --mark-alpha: 0.15;
}

.tier-pill[data-tier="basic"] {
  --t-ink: #4ade80;
  --t-line: rgba(74, 222, 128, 0.1);
  --t-wash: radial-gradient(58% 120% at 78% 52%, rgba(74, 222, 128, 0.075), transparent 72%);
  --t-glow: radial-gradient(120% 150% at 104% -20%, rgba(74, 222, 128, 0.09), transparent 62%);
  --t-edge: rgba(74, 222, 128, 0.26);
  --t-mark: linear-gradient(115deg, #a7f3c4, #35a05e);
  --bands: 2;
  --mark-alpha: 0.18;
}

.tier-pill[data-tier="foundational"] {
  --t-ink: #58a6ff;
  --t-line: rgba(88, 166, 255, 0.11);
  --t-wash: radial-gradient(58% 120% at 78% 52%, rgba(88, 166, 255, 0.085), transparent 72%);
  --t-glow: radial-gradient(120% 150% at 104% -20%, rgba(88, 166, 255, 0.1), transparent 62%);
  --t-edge: rgba(88, 166, 255, 0.3);
  --t-mark: linear-gradient(115deg, #b3d8ff, #3577c8);
  --bands: 3;
  --mark-alpha: 0.2;
}

.tier-pill[data-tier="skilled"] {
  --t-ink: #e3b341;
  --t-line: rgba(227, 179, 65, 0.12);
  --t-wash: radial-gradient(58% 120% at 78% 52%, rgba(227, 179, 65, 0.09), transparent 72%);
  --t-glow: radial-gradient(120% 150% at 104% -20%, rgba(227, 179, 65, 0.11), transparent 62%);
  --t-edge: rgba(227, 179, 65, 0.32);
  --t-mark: linear-gradient(115deg, #f8e2a0, #b8860f);
  --bands: 4;
  --mark-alpha: 0.22;
}

.tier-pill[data-tier="advanced"] {
  --t-ink: #a371f7;
  --t-line: rgba(163, 113, 247, 0.13);
  --t-wash: radial-gradient(58% 120% at 78% 52%, rgba(163, 113, 247, 0.1), transparent 72%);
  --t-glow: radial-gradient(120% 150% at 104% -20%, rgba(163, 113, 247, 0.13), transparent 64%);
  --t-edge: rgba(163, 113, 247, 0.36);
  --t-mark: linear-gradient(115deg, #d5bcff, #7c48d6);
  --bands: 5;
  --mark-alpha: 0.24;
}

/*
 * Master is prismatic, but only in the geometry: the border, the diagonals and
 * the glow. The card stays dark and the M stays translucent, so it reads as
 * precious rather than as a neon logo.
 */
.tier-pill[data-tier="master"] {
  --prism: linear-gradient(
    115deg, #22d3ee, #60a5fa, #a78bfa, #f472b6, #fb7185, #fbbf24, #4ade80
  );
  --t-ink: #b9a6ff;
  --t-line: rgba(185, 166, 255, 0.14);
  --t-wash: radial-gradient(58% 120% at 78% 52%, rgba(167, 139, 250, 0.1), transparent 72%),
            radial-gradient(46% 100% at 92% 78%, rgba(34, 211, 238, 0.07), transparent 72%);
  --t-glow: radial-gradient(130% 160% at 104% -25%, rgba(167, 139, 250, 0.13), transparent 60%);
  --t-edge: rgba(180, 200, 255, 0.4);
  --t-mark: var(--prism);
  --bands: 6;
  --pitch: 9px;
  --mark-alpha: 0.28;
}

/* Light theme needs denser ink or the whole system disappears on parchment. */
[data-theme="light"] .tier-pill { --mark-alpha: 0.22; }
[data-theme="light"] .tier-pill[data-tier="novice"] {
  --t-ink: #5b6880; --t-line: rgba(91, 104, 128, 0.14);
}
[data-theme="light"] .tier-pill[data-tier="basic"] {
  --t-ink: #1f9d55; --t-line: rgba(31, 157, 85, 0.16); --mark-alpha: 0.24;
}
[data-theme="light"] .tier-pill[data-tier="foundational"] {
  --t-ink: #2563eb; --t-line: rgba(37, 99, 235, 0.16); --mark-alpha: 0.26;
}
[data-theme="light"] .tier-pill[data-tier="skilled"] {
  --t-ink: #b07d12; --t-line: rgba(176, 125, 18, 0.17); --mark-alpha: 0.28;
}
[data-theme="light"] .tier-pill[data-tier="advanced"] {
  --t-ink: #7c3aed; --t-line: rgba(124, 58, 237, 0.17); --mark-alpha: 0.3;
}
[data-theme="light"] .tier-pill[data-tier="master"] {
  --t-ink: #7c5cd6; --t-line: rgba(124, 92, 214, 0.18); --mark-alpha: 0.32;
}

/* ------------------------------------------------- layer 1: the geometry -- */

/*
 * Three background layers, all confined to the right side by a percentage mask:
 *   1  the soft tier wash, where a dotted pattern used to be. Dots read as
 *      noise at this scale and fought the numeral for attention; a gradient in
 *      the same hue gives the same sense of density without the stipple.
 *   2  the diagonal accent lines, count = --bands
 *   3  the tier glow from the top-right
 */
.tier-pill[data-tier]::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  opacity: var(--geo-alpha);
  transition: opacity 0.24s;

  background-image:
    var(--t-wash),
    repeating-linear-gradient(115deg, var(--t-line) 0 1.5px, transparent 1.5px var(--pitch)),
    var(--t-glow);
  background-repeat: no-repeat, no-repeat, no-repeat;
  background-size:
    cover,
    calc(var(--bands) * var(--pitch)) 210%,
    cover;
  background-position:
    center,
    right -8% center,
    center;

  /* The calm zone, in percentages so it holds at any width. */
  -webkit-mask-image: linear-gradient(90deg, transparent 42%, #000 72%);
  mask-image: linear-gradient(90deg, transparent 42%, #000 72%);
}

.tier-pill:hover::before { opacity: 0.9; }

/* Master's prismatic border, via the gradient-border trick so the radius
   survives. Only in the neutral state: available and complete mean something
   and their colours must win. */
.tier-pill[data-tier="master"].state-pending,
.tier-pill[data-tier="master"].is-pending {
  border-color: transparent;
  background-image: linear-gradient(var(--box-locked-bg), var(--box-locked-bg)), var(--prism);
  background-origin: border-box;
  background-clip: padding-box, border-box;
}

/* Every other tier tints its border only when the state is neutral. */
.tier-pill.state-pending,
.tier-pill.is-pending { border-color: var(--t-edge); }

/* ---------------------------------------------- layer 2: the tier glyph -- */

/*
 * Oversized, pivoted in 3D and cropped by the card. It sits at z-index -1,
 * which inside a stacking context paints it above the geometry but below the
 * text, so the glyph is always readable over the rainbow and never competes
 * with the title.
 */
.tier-pill[data-mark]:not([data-mark=""])::after {
  content: attr(data-mark);
  position: absolute;
  z-index: -1;
  pointer-events: none;
  top: 50%;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.06em;
  line-height: 0.78;
  background: var(--t-mark);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  opacity: var(--mark-alpha);

  /*
   * Offset left off its anchor, then pivoted in 3D rather than skewed. A
   * negative rotateY swings the left edge away from the viewer and brings the
   * right edge forward, so the glyph reads as set back into the card.
   *
   * -50% on Y is what centres it, paired with top:50%. Held in a custom
   * property so hover and state variants append to it instead of restating the
   * whole stack and drifting out of sync.
   */
  --mark-transform: perspective(260px) translate(-20%, -50%) rotateY(-10deg) skewX(-7deg);
  transform: var(--mark-transform);
  transform-origin: 50% 50%;
  transition: opacity 0.22s, transform 0.28s var(--ease);
}

.mbox[data-mark]:not([data-mark=""])::after {
  right: -0.06em;
  font-size: clamp(3.6rem, 9.75vh, 6rem);
}
.rail-item[data-mark]:not([data-mark=""])::after {
  right: -0.04em;
  font-size: 3.2rem;
}

.tier-pill:hover::after {
  transform: var(--mark-transform) scale(1.06);
  opacity: calc(var(--mark-alpha) * 1.45);
}

/* Completed and available cards carry a functional colour, so the decoration
   steps back a little rather than competing with it. */
.mbox.state-complete::after,
.mbox.state-available::after { opacity: calc(var(--mark-alpha) * 0.85); }

/* ------------------------------------------------------ narrow variants -- */

/*
 * Below ~190px the pill cannot carry the full treatment: the glyph starts to
 * crowd the title. Simplify rather than scale everything down uniformly, and
 * never touch the content's own type size.
 */
@container (max-width: 190px) {
  .tier-pill[data-mark]:not([data-mark=""])::after { font-size: clamp(2.2rem, 6.5vh, 3.4rem); }
  .tier-pill[data-tier]::before {
    background-position: center, right -14% center, center;
    -webkit-mask-image: linear-gradient(90deg, transparent 52%, #000 82%);
    mask-image: linear-gradient(90deg, transparent 52%, #000 82%);
  }
}

@container (max-width: 150px) {
  /* Halve the diagonals: at this width the full set reads as a hatch, not an
     accent. The wash and glow carry the tier colour on their own. */
  .tier-pill[data-tier]::before {
    background-size: cover, calc(var(--bands) * var(--pitch) / 2) 210%, cover;
  }
}

.mbox .mbox-title {
  font-family: var(--font-display);
  font-weight: 600;
  /* Two steps up from the original clamp(.68, 1.4vh, .88). The category is what
     you scan the lattice for, so it carries the weight; the level line below it
     stays small deliberately, as a subtitle rather than a peer. */
  font-size: clamp(0.85rem, 1.8vh, 1.12rem);
  line-height: 1.2;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
/* The tier sits UNDER the title: the title is what you scan for, the numeral is
   the footnote that tells you where you are in the column. */
.mbox .mbox-tier {
  font-size: clamp(0.5rem, 0.92vh, 0.62rem);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted-2);
  font-weight: 700;
  line-height: 1.1;
}

.mbox.is-cap {
  background: var(--card-3);
  border-color: var(--line-3);
}
.mbox.is-cap .mbox-title { font-size: clamp(0.95rem, 2.05vh, 1.28rem); font-weight: 700; }

/*
 * Three states, and none of them is "closed". Every box is a link; the outline
 * says where you stand.
 *
 *   pending    neutral, readable, quiz not attemptable yet
 *   available  orange outline, the quiz can be taken now
 *   complete   green outline, quiz passed
 */
.mbox.state-complete {
  border-color: var(--ok);
  border-width: 2px;
  background: color-mix(in srgb, var(--ok) 12%, var(--box-bg));
}
.mbox.state-complete .mbox-tier { color: var(--ok-ink); }
.mbox.state-complete:hover { border-color: var(--ok); }

.mbox.state-available {
  border-color: var(--accent);
  border-width: 2px;
  box-shadow: 0 0 0 3px var(--accent-wash);
}
.mbox.state-available .mbox-tier { color: var(--accent-ink); }

.mbox.state-pending {
  background: var(--box-locked-bg);
  color: var(--box-locked-text);
  border-color: var(--box-line);
}
.mbox.state-pending .mbox-tier { color: var(--box-locked-text); }
.mbox.state-pending:hover {
  background: var(--box-bg-hover);
  color: var(--box-text);
  border-color: var(--line-3);
}

.mbox-mark {
  position: absolute;
  top: 0.3rem;
  right: 0.35rem;
  font-size: 0.72rem;
  line-height: 1;
  opacity: 0.9;
}
.mbox.state-complete .mbox-mark { color: var(--ok-ink); }

.mbox-edit {
  position: absolute;
  top: 0.25rem;
  left: 0.3rem;
  width: 22px;
  height: 22px;
  display: none;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  border: 1px solid var(--line-2);
  background: var(--card-2);
  color: var(--muted);
  font-size: 0.7rem;
  cursor: pointer;
  z-index: 3;
}
.mbox-edit:hover { color: var(--accent-ink); border-color: var(--accent); }
body.edit-mode .mbox-edit { display: inline-flex; }

/* Authoring: force a module's completion so the finished state can be seen
   without working through every quiz beneath it. */
.mbox-toggle {
  position: absolute;
  top: 0.25rem;
  left: 1.9rem;
  width: 22px;
  height: 22px;
  display: none;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  border: 1px solid var(--line-2);
  background: var(--card-2);
  color: var(--muted);
  font-size: 0.7rem;
  cursor: pointer;
  z-index: 3;
}
.mbox-toggle:hover { color: var(--ok-ink); border-color: var(--ok); }
body.edit-mode .mbox-toggle { display: inline-flex; }
.mbox.state-complete .mbox-toggle:hover { color: var(--danger); border-color: var(--danger); }

@media (max-width: 768px) {
  .mbox-toggle { left: auto; right: 4.4rem; }
}

/* ------------------------------------------------------- tree mobile -- */

@media (max-width: 768px) {
  .view-tree {
    height: auto;
    min-height: calc(100dvh - var(--chrome));
    overflow: visible;
  }
  .lattice { --tgap: 0.5rem; }
  .lattice-cap { min-height: 0; }
  .lattice-cap .mbox { width: 100%; }
  .lattice-cap::after { display: none; }
  .lattice-cap .mbox::after { display: none; }
  .lattice-band {
    grid-template-columns: 1fr;
    gap: 1.4rem;
    margin-block: 0.4rem;
  }
  .lattice-col { display: block; padding-top: 1.35rem; }
  .lattice-col::before { top: 1.35rem; bottom: 0; }
  .col-boxes {
    grid-template-rows: none;
    grid-auto-rows: minmax(48px, auto);
    max-height: none;
  }
  .col-label {
    display: block;
    inset: 0 0 auto 0;
    text-align: left;
    font-size: 0.72rem;
    color: var(--accent-ink);
    padding-bottom: 0;
  }
  .lattice-cap { height: auto; min-height: 48px; }
  .mbox { text-align: left; align-items: flex-start; padding: 0.5rem 0.7rem; }
  .mbox .mbox-title { font-size: 0.92rem; }
  .mbox .mbox-tier { font-size: 0.62rem; }
  .mbox-edit { left: auto; right: 2rem; }
  .tree-head-right { min-width: 100%; }
}

/* ======================================================= module view ==== */

/*
 * Two columns, and the first one collapses.
 *
 * The width lives in a custom property so the grid template can transition it;
 * the rail itself keeps its natural width and is clipped by its wrapper, which
 * is what makes the close read as a slide rather than a squash.
 */
.view-module {
  --rail-w: clamp(190px, 17vw, 220px);
  --rail-gap: clamp(1rem, 2.5vw, 2rem);
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  column-gap: var(--rail-gap);
  align-items: start;
  padding: clamp(1rem, 3vh, 1.8rem) clamp(0.75rem, 2vw, 1.5rem) 4rem;
  transition: grid-template-columns 0.34s var(--ease), column-gap 0.34s var(--ease);
}
/* The collapse only exists where the rail is a sidebar. Below 900px it becomes a
   horizontal strip and the saved "closed" preference must not follow it there,
   or the strip would inherit opacity:0 and vanish. */
@media (min-width: 901px) {
  .view-module.rail-closed {
    --rail-w: 0px;
    --rail-gap: 0px;
  }
  .rail-closed .mod-rail {
    transform: translateX(-14px);
    opacity: 0;
    pointer-events: none;
  }
}

.mod-rail-wrap {
  overflow: hidden;
  position: sticky;
  top: calc(var(--chrome) + 1rem);
}

/* The originating category, kept alongside so the module never loses its place. */
.mod-rail {
  width: clamp(190px, 17vw, 220px);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  transition: transform 0.34s var(--ease), opacity 0.22s ease;
}

/*
 * Icon AND label. The glyph alone was an arrow, which in a view that already has
 * breadcrumbs and a "Tree" button reads as "go back" rather than "collapse a
 * panel". The word removes the guess; the sidebar glyph carries the state.
 */
.rail-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  height: 30px;
  padding: 0 0.6rem;
  flex: 0 0 auto;
  border-radius: 999px;
  border: 1px solid var(--line-2);
  background: var(--card);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.18s, border-color 0.18s, background 0.18s;
}
.rail-toggle:hover { color: var(--text); border-color: var(--accent); background: var(--card-3); }
.rail-toggle .rail-toggle-ico { display: inline-flex; font-size: 0.95rem; }
.rail-toggle-label { line-height: 1; }

/* Pressed state, so "the menu is showing" is visible without reading the icon. */
.rail-toggle[aria-expanded="true"] {
  color: var(--accent-ink);
  border-color: var(--accent);
  background: var(--accent-wash);
}
.mod-rail .rail-head {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted-2);
  margin-bottom: 0.2rem;
}
.rail-item {
  position: relative;
  isolation: isolate; /* so the watermark's z-index:-1 stays inside the pill */
  overflow: hidden;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.5rem 1.6rem 0.5rem 0.65rem;
  border-radius: var(--radius-xs);
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--muted);
  font-size: 0.83rem;
  cursor: pointer;
  text-align: left;
  width: 100%;
  transition: border-color 0.18s, color 0.18s, background 0.18s;
}

/* Position and size live in the tier-pill system; only the selected emphasis
   is specific to the rail. */
.rail-item.is-current::after { opacity: calc(var(--mark-alpha) * 1.8); }
.rail-item:hover { color: var(--text); border-color: var(--line-3); }
/* Wide enough for "III" and for a category's "2/4"; the old fixed 22px was
   clipping the third numeral down to "II". */
.rail-item .rail-n {
  flex: 0 0 auto;
  min-width: 30px;
  height: 24px;
  padding-inline: 0.3rem;
  display: grid;
  place-items: center;
  border-radius: 6px;
  background: var(--card-3);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
  color: var(--muted-2);
}
.rail-item.is-available { border-color: var(--accent); }
.rail-item.is-available .rail-n { color: var(--accent-ink); }
.rail-item.is-complete { border-color: var(--ok); }
.rail-item.is-complete .rail-n { background: var(--ok-wash); color: var(--ok-ink); }
.rail-item.is-current {
  background: var(--accent-wash);
  color: var(--text);
  font-weight: 600;
  border-color: var(--accent);
}
.rail-item.is-current .rail-n { background: var(--grad); color: var(--on-accent); }
.rail-item.is-complete.is-current { border-color: var(--ok); }

/* Novice and Master read as bookends, not as another rung on the ladder. */
.rail-cat .rail-n { font-size: 0.64rem; }
.rail-item.is-exit {
  margin-top: 0.5rem;
  border-style: dashed;
  color: var(--muted-2);
}
.rail-item.is-exit:hover { border-style: solid; color: var(--text); }
/*
 * The label stacks: category on top, level beneath.
 *
 * A hyphenated single line read as one phrase, and at rail width it truncated
 * exactly where the meaning lives. Stacked, each part gets its own line and its
 * own weight, and the pill height stays constant because the block is always
 * two lines tall whether or not the second one is used.
 */
.rail-item .rail-t {
  flex: 1;
  min-width: 0;
  min-height: 2.5em;
  display: flex;
  align-items: center;
  line-height: 1.2;
}
/*
 * The lines live inside a plain block, not directly in the flex box.
 * -webkit-line-clamp only works on display:-webkit-box, and a flex item is
 * blockified out of that, which silently turns the clamp into a hard clip with
 * no ellipsis. One wrapper keeps the clamp intact.
 */
.rail-item .rail-lines { display: block; width: 100%; min-width: 0; }
.rail-item .rail-title {
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.rail-item .rail-level {
  font-size: 0.72em;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted-2);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.rail-item.is-current .rail-level { color: var(--accent-ink); }
.rail-item.is-complete .rail-level { color: var(--ok-ink); }

/* Novice, Master and the category rows have no level beneath them, so their
   title is free to use both reserved lines rather than ellipsising at one. */
.rail-item .rail-lines:not(:has(.rail-level)) .rail-title {
  white-space: normal;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  text-overflow: ellipsis;
}

.mod-main { min-width: 0; max-width: 78ch; }

.mod-head { margin-bottom: 1.6rem; }
.mod-head .mod-kicker {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 0.7rem;
}
.mod-head h1 { font-size: clamp(1.5rem, 4vw, 2.2rem); margin-bottom: 0.35rem; }
/* The topic: what this particular tier covers, under the derived box name. */
.mod-head .mod-topic {
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.4vw, 1.2rem);
  font-weight: 600;
  color: var(--accent-ink);
  margin-bottom: 0.6rem;
}
.mod-head .mod-blurb { color: var(--muted); font-size: 1rem; }

.mod-blocks { display: flex; flex-direction: column; gap: clamp(1.2rem, 3vh, 2rem); }

/* ---------------------------------------------------- collapsible sections */

.mod-sections { display: flex; flex-direction: column; gap: 0.9rem; }

.mod-section {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  overflow: hidden;
}

.sec-toggle {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  width: 100%;
  padding: 0.85rem 1rem;
  background: none;
  border: 0;
  cursor: pointer;
  text-align: left;
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.98rem;
  transition: background 0.18s;
}
.sec-toggle:hover { background: var(--card-3); }
.sec-chevron { display: inline-flex; color: var(--muted-2); transition: transform 0.28s var(--ease); }
.sec-ico { display: inline-flex; color: var(--accent-ink); }
.sec-title { flex: 1; min-width: 0; }
.sec-count {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--muted-2);
  background: var(--card-3);
  border-radius: 999px;
  min-width: 22px;
  padding: 0.15rem 0.45rem;
  text-align: center;
}

.sec-body {
  padding: 0 1rem 1.1rem;
  display: grid;
  grid-template-rows: 1fr;
  transition: grid-template-rows 0.3s var(--ease), padding 0.3s var(--ease), opacity 0.2s;
}
.sec-body > * { min-height: 0; }

.mod-section.is-collapsed .sec-chevron { transform: rotate(-90deg); }
.mod-section.is-collapsed .sec-body {
  grid-template-rows: 0fr;
  padding-block: 0;
  opacity: 0;
  overflow: hidden;
}

.sec-stack { display: flex; flex-direction: column; gap: 1rem; }
.sec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: 1rem;
}
.sub-article + .sub-article { padding-top: 1.2rem; border-top: 1px solid var(--line); }
.sub-article h3 { font-size: 1.05rem; margin-bottom: 0.6rem; }

.quiz-teaser {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.quiz-teaser .hint { margin-top: 0.15rem; }

.mod-foot {
  margin-top: 2.4rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--line);
  display: flex;
  gap: 0.8rem;
  align-items: center;
  flex-wrap: wrap;
}

/* Shown under the content, never instead of it. */
.banner.prereq {
  margin: 2rem 0 0;
  border-color: var(--accent);
  background: var(--accent-wash);
  color: var(--text);
}
.banner.prereq .ico { color: var(--accent-ink); }
.banner.prereq strong { display: block; }

@media (max-width: 900px) {
  /* The rail becomes a horizontal strip here, which is already compact, so the
     collapse control has nothing useful to do and would only take up room. */
  .view-module, .view-module.rail-closed {
    grid-template-columns: 1fr;
    --rail-gap: 0px;
  }
  .mod-rail-wrap { position: static; overflow: visible; }
  .mod-rail {
    width: auto;
    position: static;
    flex-direction: row;
    overflow-x: auto;
    gap: 0.4rem;
    padding-bottom: 0.4rem;
    scrollbar-width: thin;
  }
  .mod-rail .rail-head { display: none; }
  .rail-item { width: auto; flex: 0 0 auto; }
  .rail-item .rail-t { max-width: 120px; }
  .rail-toggle { display: none; }
}

/* ============================================================ blocks ==== */

.block { position: relative; }
.block > h3 {
  font-size: 1.12rem;
  margin-bottom: 0.7rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.block > h3 .ico { color: var(--accent-ink); font-size: 0.95rem; }

.prose { color: var(--text); }
.prose > * + * { margin-top: 0.9rem; }
.prose p { color: var(--muted); }
.prose .md-h { font-size: 1.05rem; margin-top: 1.4rem; }
/*
 * Lists get generous left padding for two reasons. The base reset strips
 * list-style and padding globally, so a bare <ul> from the rich text editor
 * would otherwise render with no markers at all; and with markers OUTSIDE the
 * content box, a small padding leaves the bullets hanging into the card's own
 * padding, almost touching its edge. 1.9rem puts the marker inside the card and
 * the text in a clean column.
 */
.prose ul, .prose ol, .prose .md-ul, .prose .md-ol {
  padding-left: 1.9rem;
  color: var(--muted);
  display: grid;
  gap: 0.4rem;
}
.prose ul, .prose .md-ul { list-style: disc; }
.prose ol, .prose .md-ol { list-style: decimal; }
.prose li { padding-left: 0.15rem; }
.prose li::marker { color: var(--accent); }
.prose li > ul, .prose li > ol { margin-top: 0.4rem; }
.prose .md-quote {
  border-left: 3px solid var(--accent);
  padding: 0.35rem 0 0.35rem 1rem;
  color: var(--muted);
  font-style: italic;
}
.prose .md-code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--card-3);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 0.1em 0.38em;
}
.prose .md-pre {
  background: var(--card-3);
  border: 1px solid var(--line-2);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.55;
}
.prose .md-pre code { background: none; border: 0; padding: 0; }
.prose .md-link { color: var(--accent-ink); text-decoration: underline; text-underline-offset: 2px; }
.prose .md-img { max-width: 100%; height: auto; border-radius: var(--radius-sm); }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 1.4rem 0; }

/* ============================================================ rich text ==== */

/* Classes the editor applies, and the only ones the sanitiser lets through. */
.prose .rt-serif { font-family: Georgia, "Times New Roman", serif; }
.prose .rt-mono { font-family: var(--font-mono); font-size: 0.9em; }
.prose .rt-sans { font-family: var(--font-sans); }
.prose .rt-sm { font-size: 0.86em; }
.prose .rt-lg { font-size: 1.18em; }
.prose .rt-xl { font-size: 1.42em; font-weight: 600; }
.prose .rt-hl { background: var(--accent-wash); border-radius: 3px; padding: 0 0.15em; }

/* The note box: a highlighted aside written inline, not a separate block type. */
.prose .rt-note,
.rt-surface .rt-note {
  position: relative;
  margin: 1.2rem 0;
  padding: 0.9rem 1.1rem 0.9rem 2.6rem;
  border: 1px solid var(--line-2);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  background: var(--card-2);
}
.prose .rt-note::before,
.rt-surface .rt-note::before {
  content: "i";
  position: absolute;
  left: 0.85rem;
  top: 0.95rem;
  width: 1.1rem;
  height: 1.1rem;
  display: grid;
  place-items: center;
  border-radius: 999px;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--on-accent);
  background: var(--accent);
}
.prose .rt-note p:last-child, .rt-surface .rt-note p:last-child { margin-bottom: 0; }

.rt-note[data-tone="tip"] { border-left-color: var(--ok); }
.rt-note[data-tone="tip"]::before { content: "✓"; background: var(--ok); color: #fff; }
.rt-note[data-tone="warning"] { border-left-color: var(--warn); }
.rt-note[data-tone="warning"]::before { content: "!"; background: var(--warn); color: #fff; }
.rt-note[data-tone="danger"] { border-left-color: var(--danger); background: var(--danger-wash); }
.rt-note[data-tone="danger"]::before { content: "!"; background: var(--danger); color: #fff; }

/* ---- the editor itself ---- */

.rt {
  border: 1px solid var(--line-2);
  border-radius: var(--radius-sm);
  background: var(--card-2);
  overflow: hidden;
}
.rt-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.3rem;
  padding: 0.45rem;
  background: var(--card-3);
  border-bottom: 1px solid var(--line-2);
  position: sticky;
  top: 0;
  z-index: 2;
}
.rt-group { display: inline-flex; gap: 0.2rem; }
.rt-group + .rt-group::before,
.rt-select + .rt-group::before {
  content: "";
  width: 1px;
  align-self: stretch;
  background: var(--line-2);
  margin-inline: 0.25rem;
}
.rt-btn {
  min-width: 32px;
  height: 32px;
  padding: 0 0.5rem;
  display: inline-grid;
  place-items: center;
  border-radius: 7px;
  border: 1px solid transparent;
  background: none;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.rt-btn:hover { background: var(--card); color: var(--text); border-color: var(--line-2); }
.rt-note-btn { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.02em; }
.rt-clear { font-size: 0.72rem; margin-left: auto; }
.rt-select {
  height: 32px;
  width: auto;
  padding: 0 0.45rem;
  font-size: 0.8rem;
  border-radius: 7px;
  background: var(--card);
  border: 1px solid var(--line-2);
}

.rt-surface {
  padding: 1rem 1.1rem;
  outline: none;
  overflow-y: auto;
  max-height: 55vh;
  background: var(--card);
}
.rt-surface:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.rt-surface > *:first-child { margin-top: 0; }
/* The editor writes bare <ul>/<ol>, which the global reset would flatten. */
.rt-surface ul, .rt-surface ol { padding-left: 1.9rem; display: grid; gap: 0.4rem; }
.rt-surface ul { list-style: disc; }
.rt-surface ol { list-style: decimal; }
.rt-surface li::marker { color: var(--accent); }
.rt-surface[contenteditable]:empty::before {
  content: "Write the module here…";
  color: var(--muted-2);
}

@media (max-width: 768px) {
  .rt-toolbar { gap: 0.2rem; padding: 0.35rem; }
  .rt-btn { min-width: 38px; height: 38px; }
  .rt-select { height: 38px; }
  .rt-clear { margin-left: 0; }
  .rt-surface { max-height: 45vh; }
}

.callout {
  display: flex;
  gap: 0.8rem;
  padding: 1rem 1.15rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-2);
  border-left-width: 3px;
  background: var(--card-2);
}
.callout .ico { flex: 0 0 auto; margin-top: 0.2rem; font-size: 1.05rem; }
.callout strong { display: block; margin-bottom: 0.2rem; }
.callout .prose p { color: var(--muted); }
.callout.tone-note { border-left-color: var(--accent); }
.callout.tone-note .ico { color: var(--accent-ink); }
.callout.tone-tip { border-left-color: var(--ok); }
.callout.tone-tip .ico { color: var(--ok-ink); }
.callout.tone-warning { border-left-color: var(--warn); }
.callout.tone-warning .ico { color: var(--warn); }
.callout.tone-danger { border-left-color: var(--danger); background: var(--danger-wash); }
.callout.tone-danger .ico { color: var(--danger); }

.media-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--line-2);
  background: #000;
  box-shadow: var(--shadow-sm);
}
.media-frame iframe, .media-frame video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}
figure { margin: 0; }
figcaption { font-size: 0.82rem; color: var(--muted-2); margin-top: 0.5rem; text-align: center; }

/* YouTube click-to-play facade: a thumbnail until someone presses play, so an
   unwatched video costs one image instead of a whole embedded player. */
.yt-facade { background: #000; }
.yt-cover {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  padding: 0;
  border: 0;
  background: #000;
  cursor: pointer;
}
.yt-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: opacity 0.2s, transform 0.3s var(--ease);
}
.yt-cover:hover .yt-thumb { opacity: 0.82; transform: scale(1.02); }
.yt-play {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 68px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: rgba(18, 18, 18, 0.78);
  color: #fff;
  font-size: 1.4rem;
  transition: background 0.2s, transform 0.2s var(--ease);
}
.yt-cover:hover .yt-play { background: #ff0033; transform: scale(1.06); }
.yt-play .ico { width: 1em; height: 1em; fill: currentColor; }

.block-image img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  cursor: zoom-in;
  display: block;
}

.resource {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 0.9rem 1.1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-2);
  background: var(--card);
  transition: border-color 0.18s, transform 0.18s var(--ease);
}
.resource:hover { border-color: var(--accent); transform: translateY(-1px); }
.resource .res-ico {
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: var(--accent-wash);
  color: var(--accent-ink);
  font-size: 1.05rem;
}
.resource .res-body { min-width: 0; flex: 1; }
.resource .res-title { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.resource .res-sub { font-size: 0.8rem; color: var(--muted-2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.resource .ico-go { color: var(--muted-2); }

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  padding: 2rem;
  background: rgba(0, 0, 0, 0.86);
  cursor: zoom-out;
}
.lightbox img { max-width: 100%; max-height: 100%; border-radius: var(--radius-sm); }

/* ============================================================== quiz ==== */

.quiz { max-width: 68ch; }
.quiz-head { margin-bottom: 1.6rem; }
.quiz-head h1 { font-size: clamp(1.4rem, 3.6vw, 2rem); margin-bottom: 0.5rem; }
.quiz-head p { color: var(--muted); }
.quiz-meta { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 0.9rem; }

.q-card {
  padding: clamp(1.1rem, 2.6vw, 1.6rem);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--card);
  margin-bottom: 1rem;
}
.q-card .q-num {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted-2);
  font-weight: 700;
  margin-bottom: 0.5rem;
  display: flex;
  gap: 0.6rem;
  align-items: center;
}
.q-card .q-prompt { font-weight: 600; font-size: 1.02rem; margin-bottom: 0.9rem; }
.q-card .q-image {
  max-width: 100%;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  margin-bottom: 1rem;
  display: block;
}

.choices { display: grid; gap: 0.5rem; }
.choice {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius-xs);
  border: 1px solid var(--line-2);
  background: var(--card-2);
  cursor: pointer;
  transition: border-color 0.16s, background 0.16s;
}
.choice:hover { border-color: var(--line-3); }
.choice input { margin-top: 0.28rem; accent-color: var(--accent); width: auto; flex: 0 0 auto; }
.choice.is-picked { border-color: var(--accent); background: var(--accent-wash); }
.choice.is-right { border-color: var(--ok); background: var(--ok-wash); }
.choice.is-wrong { border-color: var(--danger); background: var(--danger-wash); }
.choice .mark { margin-left: auto; font-size: 0.78rem; font-weight: 700; }
.choice.is-right .mark { color: var(--ok-ink); }
.choice.is-wrong .mark { color: var(--danger); }

.q-verdict {
  margin-top: 0.9rem;
  padding: 0.75rem 0.95rem;
  border-radius: var(--radius-xs);
  font-size: 0.88rem;
  border: 1px solid var(--line-2);
  background: var(--card-2);
}
.q-verdict.right { border-color: var(--ok); background: var(--ok-wash); }
.q-verdict.wrong { border-color: var(--danger); background: var(--danger-wash); }
.q-verdict b { display: block; margin-bottom: 0.2rem; }

.quiz-result {
  text-align: center;
  padding: clamp(1.6rem, 5vh, 2.8rem);
  border-radius: var(--radius);
  border: 1px solid var(--line-2);
  background: var(--card);
  margin-bottom: 1.6rem;
}
.quiz-result .score {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 9vw, 3.4rem);
  font-weight: 800;
  line-height: 1;
}
.quiz-result.pass .score { color: var(--ok-ink); }
.quiz-result.fail .score { color: var(--danger); }
.quiz-result p { color: var(--muted); margin-top: 0.6rem; }
.quiz-actions { display: flex; gap: 0.7rem; justify-content: center; flex-wrap: wrap; margin-top: 1.4rem; }

.quiz-bar {
  position: sticky;
  bottom: 0;
  display: flex;
  gap: 0.8rem;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 0;
  background: linear-gradient(to top, var(--bg) 60%, transparent);
  flex-wrap: wrap;
}

/* ============================================================ editor ==== */

.sheet {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: flex;
  flex-direction: column;
  background: var(--bg);
}
.sheet-head {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem clamp(0.75rem, 2vw, 1.5rem);
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
}
.sheet-head h2 { font-size: 1rem; flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sheet-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: clamp(1rem, 3vh, 1.6rem) clamp(0.75rem, 2vw, 1.5rem) 5rem;
  -webkit-overflow-scrolling: touch;
}
.sheet-body > .sheet-inner { width: min(100%, 760px); margin-inline: auto; }
.sheet-foot {
  flex: 0 0 auto;
  display: flex;
  gap: 0.7rem;
  justify-content: flex-end;
  padding: 0.75rem clamp(0.75rem, 2vw, 1.5rem);
  padding-bottom: max(0.75rem, env(safe-area-inset-bottom));
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
}
.sheet-foot .btn { min-height: 44px; }

.ed-section {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--card);
  padding: clamp(0.9rem, 2.4vw, 1.25rem);
  margin-bottom: 1.1rem;
}
.ed-section > h3 {
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted-2);
  margin-bottom: 0.9rem;
}

.ed-item {
  border: 1px solid var(--line-2);
  border-radius: var(--radius-sm);
  background: var(--card-2);
  margin-bottom: 0.7rem;
  overflow: hidden;
}
.ed-item-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.7rem;
  background: var(--card-3);
  cursor: pointer;
}
.ed-item-head .ed-kind {
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-ink);
  background: var(--accent-wash);
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  flex: 0 0 auto;
}
.ed-item-head .ed-name {
  flex: 1;
  min-width: 0;
  font-weight: 600;
  font-size: 0.88rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.ed-item-head .ed-tools { display: flex; gap: 0.25rem; flex: 0 0 auto; }
.ed-tool {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  border: 1px solid var(--line-2);
  background: var(--card);
  color: var(--muted);
  cursor: pointer;
  font-size: 0.85rem;
}
.ed-tool:hover { color: var(--text); border-color: var(--line-3); }
.ed-tool.danger:hover { color: var(--danger); border-color: var(--danger); }
.ed-tool:disabled { opacity: 0.3; cursor: not-allowed; }

.ed-item-body { padding: 0.9rem; display: none; border-top: 1px solid var(--line); }
.ed-item.is-open .ed-item-body { display: block; }

/* Collapsible section wrappers in the editor, mirroring the reader's. */
.ed-collapsible { padding: 0; overflow: hidden; }
.ed-sec-head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
  padding: 0.8rem 1rem;
  background: var(--card-3);
  border: 0;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
  text-align: left;
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.92rem;
}
.ed-sec-head:hover { background: var(--card-2); }
.ed-sec-body { padding: 1rem; }
.ed-collapsible.is-collapsed .ed-sec-body { display: none; }
.ed-collapsible.is-collapsed .ed-sec-head { border-bottom-color: transparent; }
.ed-collapsible.is-collapsed .sec-chevron { transform: rotate(-90deg); }
.ed-sec-head .sec-chevron { display: inline-flex; color: var(--muted-2); transition: transform 0.2s var(--ease); }
.ed-sec-head .sec-ico { display: inline-flex; color: var(--accent-ink); }
.ed-sec-head .sec-title { flex: 1; }

.type-picker { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 1rem; }
.type-picker button {
  padding: 0.5rem 0.8rem;
  min-height: 40px;
  border-radius: 999px;
  border: 1px dashed var(--line-2);
  background: var(--card-2);
  color: var(--muted);
  font-size: 0.82rem;
  cursor: pointer;
}
.type-picker button:hover { border-style: solid; border-color: var(--accent); color: var(--accent-ink); }

.ed-choice {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.45rem;
}
.ed-choice input[type="text"] { flex: 1; }
.ed-choice .ed-correct {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  color: var(--muted);
  white-space: nowrap;
  padding: 0.35rem 0.5rem;
  border-radius: 8px;
  border: 1px solid var(--line-2);
  cursor: pointer;
}
.ed-choice .ed-correct input { width: auto; accent-color: var(--ok); }
.ed-choice .ed-correct:has(input:checked) { border-color: var(--ok); color: var(--ok-ink); background: var(--ok-wash); }

/* A value the editor shows but does not let you type into, because it is
   derived from somewhere else. */
.ed-derived {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  flex-wrap: wrap;
  padding: 0.62rem 0.75rem;
  border-radius: var(--radius-xs);
  border: 1px dashed var(--line-2);
  background: var(--card-3);
}
.ed-derived b { font-family: var(--font-display); font-size: 1rem; }
.ed-derived span { font-size: 0.78rem; color: var(--muted-2); }

.upload-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 0.9rem;
}
.upload-thumb {
  width: 62px;
  height: 44px;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--line-2);
  background: var(--card-3);
}

.quota {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  font-size: 0.76rem;
  color: var(--muted-2);
  margin-top: 0.6rem;
}
.quota .meter { flex: 1; height: 6px; }
.quota.is-high { color: var(--warn); }

.dim-controls { display: flex; align-items: center; gap: 0.5rem; }
.dim-controls .dim-val {
  min-width: 2.2rem;
  text-align: center;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

/* ============================================== modal, toast, dialogs ==== */

.scrim {
  position: fixed;
  inset: 0;
  z-index: 150;
  display: grid;
  place-items: center;
  padding: 1.25rem;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(3px);
}
.modal {
  width: min(100%, 520px);
  max-height: min(86vh, 720px);
  display: flex;
  flex-direction: column;
  border-radius: var(--radius);
  border: 1px solid var(--line-2);
  background: var(--card);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.modal-head { padding: 1.1rem 1.25rem 0.6rem; }
.modal-head h2 { font-size: 1.15rem; }
.modal-head p { color: var(--muted); font-size: 0.9rem; margin-top: 0.4rem; }
.modal-body { padding: 0.6rem 1.25rem; overflow-y: auto; flex: 1; min-height: 0; }
.modal-foot {
  display: flex;
  gap: 0.6rem;
  justify-content: flex-end;
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--line);
  flex-wrap: wrap;
}
.modal-foot .btn { min-height: 44px; }

.report { font-size: 0.84rem; display: grid; gap: 0.4rem; }
.report .r-row {
  display: grid;
  gap: 0.15rem;
  padding: 0.5rem 0.6rem;
  border-radius: var(--radius-xs);
  border: 1px solid var(--line-2);
  background: var(--card-2);
}
.report .r-row.err { border-color: var(--danger); }
.report .r-path { font-family: var(--font-mono); font-size: 0.76rem; color: var(--muted-2); }

.toast-host {
  position: fixed;
  left: 50%;
  bottom: 1.25rem;
  transform: translateX(-50%);
  z-index: 300;
  display: grid;
  gap: 0.5rem;
  width: min(100% - 2rem, 460px);
  pointer-events: none;
}
.toast {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-2);
  background: var(--card);
  box-shadow: var(--shadow);
  font-size: 0.88rem;
  animation: toast-in 0.25s var(--ease);
}
.toast.ok { border-color: var(--ok); }
.toast.ok .ico { color: var(--ok-ink); }
.toast.err { border-color: var(--danger); }
.toast.err .ico { color: var(--danger); }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ======================================================== responsive ==== */

@media (max-width: 768px) {
  .topbar { gap: 0.5rem; }
  .topbar-brand span:not(.dot) { display: none; }
  .crumbs { font-size: 0.8rem; }
  .icon-btn { width: 40px; height: 40px; }
  .card-grid { grid-template-columns: 1fr; }
  .sheet-foot { padding-inline: 0.9rem; }
  .sheet-foot .btn { flex: 1; }
  .modal-foot .btn { flex: 1; }

  /* Touch targets. Up/down/delete are the primary reordering controls on a
     phone, so they get the most room; 34px is a thumb-width miss. */
  .ed-tool { width: 42px; height: 42px; font-size: 1rem; }
  .ed-item-head { padding: 0.5rem 0.55rem; gap: 0.4rem; }
  .ed-item-head .ed-tools { gap: 0.2rem; }
  .btn-sm { min-height: 42px; padding-inline: 0.9rem; }
  .switch input, .ed-correct input, .choice input { width: 20px; height: 20px; }
  .switch { padding-block: 0.3rem; }
  .dim-controls .ed-tool { font-size: 1.2rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .card:hover, .btn:hover, .mbox:hover, .resource:hover { transform: none; }
}

@media print {
  .topbar, .mod-rail, .mod-foot, .mbox-edit { display: none !important; }
}