:root {
  --mute: rgba(17, 17, 17, .64);
}

/* Geist carries the reading experience. Archivo is reserved for display hierarchy. */
h1,
h2,
h3 {
  font-family: 'Archivo', sans-serif !important;
}

input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[role="button"]:focus-visible,
[role="slider"]:focus-visible {
  outline: 2px solid var(--blue, #0047ff);
  outline-offset: 3px;
}

/* The desktop nav selector is intentionally broad in the legacy pages; reset it inside the mobile dialog. */
.mnav .mnav-links {
  position: static;
  inset: auto;
  z-index: auto;
  background: none;
  border: 0;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* ---------- Scalable content collections ---------- */

.collection-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-top: 42px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line, rgba(0, 0, 0, .08));
}

.collection-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.collection-filter {
  min-height: 34px;
  padding: 0 14px;
  border: 1px solid var(--line, rgba(0, 0, 0, .08));
  border-radius: 100px;
  background: transparent;
  color: var(--mute, rgba(17, 17, 17, .64));
  font: 550 9.5px/1 'Geist', sans-serif;
  letter-spacing: .15em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color .22s ease, border-color .22s ease, background .22s ease;
}

.collection-filter:hover {
  color: var(--ink, #111);
  border-color: rgba(0, 0, 0, .28);
}

.collection-filter[aria-pressed="true"] {
  color: #fff;
  border-color: #000;
  background: #000;
}

.collection-count {
  flex: none;
  color: var(--mute, rgba(17, 17, 17, .64));
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  font-variant-numeric: tabular-nums;
}

[data-filter-item][hidden] {
  display: none !important;
}

.collection-controls + .journal-list,
.collection-controls + .tracks,
.collection-controls + .tool-directory-grid {
  margin-top: 0 !important;
  border-top: 0 !important;
}

@media (max-width: 700px) {
  .collection-controls {
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
    margin-top: 34px;
  }
}

/* Keep the horizontal lesson rail swipeable without exposing a browser scrollbar. */
.lvlnav .wrap {
  scrollbar-width: none;
  scroll-snap-type: x proximity;
}

.lvlnav .wrap::-webkit-scrollbar {
  display: none;
}

.lvl-pill {
  scroll-snap-align: start;
}

/* Give large displays a fuller canvas while protecting comfortable text measures. */
@media (min-width: 1400px) {
  :root {
    --max: min(1520px, calc(100vw - 96px));
  }

  .about-grid {
    gap: 100px;
  }

  .why-inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(560px, .92fr);
    gap: 112px;
  }

  .sysd {
    max-width: 620px;
  }

  .focus-entry {
    gap: 96px;
  }

  .map-inner {
    grid-template-columns: 1.65fr 1fr;
    gap: 92px;
  }
}

/* ---------- Shared learning-tool interaction contract ---------- */

/* Keep vocabulary tools in the site's original, restrained visual language. */
.gl-chips {
  align-items: center;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: none;
}

.gl-chips::before {
  content: none;
}

.gl-chip {
  min-height: 0;
  border-color: var(--line, rgba(0, 0, 0, .08));
  box-shadow: none;
  font-weight: 400;
}

.gl-chip:hover {
  border-color: rgba(0, 0, 0, .3);
  color: rgba(17, 17, 17, .9);
  transform: none;
}

.gl-chip.on {
  border-color: var(--black, #000);
  background: var(--black, #000);
  box-shadow: none;
}

.gl-chip.on,
.gl-chip.on:hover {
  color: #fff;
  transform: none;
}

.gl-f {
  background: none;
}

.gl-f.on {
  background: none;
  box-shadow: none;
}

/* Reserve a generous visual stage so copy changes do not move nearby content. */
.gl-panel {
  position: relative;
  box-sizing: border-box;
  width: 100%;
  min-height: 360px;
  overflow: visible;
  border: 1px solid var(--line, rgba(0, 0, 0, .08));
  background: var(--gray, #f5f5f6);
  box-shadow: none;
  padding: 34px 36px;
}

.gl-panel::before {
  content: none;
}

.gl-panel .gl-lvl {
  display: block;
  min-height: 0;
  margin-bottom: 8px;
  padding: 0;
  border-radius: 0;
  background: none;
}

.gl-panel h4 {
  font-size: 21px;
  line-height: 1.25;
  letter-spacing: -.02em;
}

.gl-panel p {
  max-width: 66ch;
  margin-top: 10px;
  padding-top: 0;
  border-top: 0;
}

.ladder-detail {
  box-sizing: border-box;
  min-height: 430px;
  padding: 24px;
  overflow: visible;
  border: 1px solid rgba(255, 255, 255, .1);
  border-radius: 16px;
  background: rgba(255, 255, 255, .035);
}

.ladder-detail > div:last-child {
  padding-left: 30px;
  border-left: 1px solid rgba(255, 255, 255, .1);
}

.sld-panel {
  box-sizing: border-box;
  min-height: 700px;
  padding-right: 10px;
  overflow: visible;
}

/* The scale strip is a real drag/click control. */
.timeline-mode {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 9px;
  color: rgba(255, 255, 255, .48);
  font: 600 9.5px/1.2 'Geist', sans-serif;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.timeline-mode strong {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: #fff;
  font-weight: 650;
}

.timeline-mode strong::before {
  content: "◆";
  color: #a8c2ff;
  font-size: 8px;
  letter-spacing: 0;
}

.pb-track.tool-slider {
  height: 26px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  cursor: default;
  touch-action: none;
  user-select: none;
}

.pb-track.tool-slider::before {
  content: "";
  position: absolute;
  top: 50%;
  right: 0;
  left: 0;
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(255, 255, 255, .09), rgba(0, 71, 255, .62));
  transform: translateY(-50%);
}

.pb-track.tool-slider .pb-dot {
  width: 17px;
  height: 17px;
  pointer-events: none;
  transition: left .12s cubic-bezier(.2, .8, .2, 1), transform .18s ease, box-shadow .18s ease;
}

.pb-track.tool-slider:hover .pb-dot {
  transform: translate(-50%, -50%) scale(1.08);
  box-shadow: 0 0 18px rgba(0, 71, 255, .95);
}

.pb-track.tool-slider.is-dragging .pb-dot {
  transform: translate(-50%, -50%) scale(1.16);
  transition: none;
  box-shadow: 0 0 22px rgba(0, 71, 255, 1);
}

/* Static diagrams state their interaction mode explicitly. */
.sld-hint {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
}

.interaction-badge {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 5px 9px;
  border: 1px solid rgba(168, 194, 255, .48);
  border-radius: 999px;
  color: #d7e2ff;
  background: rgba(0, 71, 255, .15);
  font-weight: 700;
  letter-spacing: .14em;
}

@media (max-width: 800px) {
  .gl-panel {
    min-height: 500px;
    padding: 24px 22px;
  }

  .ladder-detail {
    min-height: 840px;
    padding: 22px 18px;
  }

  .ladder-detail > div:last-child {
    padding-top: 20px;
    padding-left: 0;
    border-top: 1px solid rgba(255, 255, 255, .1);
    border-left: 0;
  }

  .sld-panel {
    min-height: 1060px;
  }
}

@media (max-width: 520px) {
  .gl-panel {
    min-height: 520px;
  }

  .timeline-mode {
    align-items: flex-start;
    flex-direction: column;
    gap: 5px;
  }
}

/* The map panel reserves room for the longest region instead of resizing on selection. */
.map-panel {
  box-sizing: border-box;
  min-height: 500px;
  overflow: visible;
}

.map-panel .mp-sub {
  min-height: 66px;
}

@media (max-width: 900px) {
  .map-panel {
    min-height: 540px;
  }
}

@media (max-width: 520px) {
  .map-panel {
    min-height: 610px;
    padding: 32px 24px;
  }

  .mp-row {
    grid-template-columns: 1fr;
    gap: 7px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .gl-chip,
  .pb-dot {
    transition: none !important;
  }
}