/* =============================================================================
   LEARN — EXPLAINERS
   The LVR gauge (.lvr), the home-page explainer section (.learnsec) and the
   explainers page (.learn_*, .explainer_*). Tokens only, no raw colour.
   ========================================================================== */

/* ---------- the LVR gauge ---------- */
.lvr {
  background: var(--brand-800);
  color: var(--beige-500);
  border-radius: 0.75rem;
  padding: clamp(1.4rem, 3vw, 2.4rem);
  display: flex;
  flex-direction: column;
  gap: clamp(1.1rem, 2vw, 1.5rem);
}
.lvr_head .u-eyebrow { color: var(--brand-300); }
.lvr_head h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.4rem, 2.2vw, 1.9rem);
  line-height: 1;
  text-transform: uppercase;
  margin-top: 0.5rem;
}
.lvr_tabs {
  display: inline-flex;
  align-self: flex-start;
  padding: 0.25rem;
  border-radius: 999px;
  border: 1px solid rgb(var(--ivory-rgb) / 0.22);
}
.lvr_tab {
  min-height: 2.75rem;
  padding: 0 1.1rem;
  border-radius: 999px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-small);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgb(var(--ivory-rgb) / 0.7);
  transition: background 0.35s var(--ease-expo), color 0.35s ease;
}
.lvr_tab[aria-checked="true"] {
  background: var(--beige-500);
  color: var(--brand-800);
}
.lvr_tab:focus-visible,
.lvr_field input:focus-visible {
  outline: 2px solid var(--brand-300);
  outline-offset: 3px;
}
.lvr_field label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  font-size: var(--fs-small);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgb(var(--ivory-rgb) / 0.7);
}
.lvr_field output {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-large);
  letter-spacing: 0.02em;
  color: var(--beige-500);
  font-variant-numeric: tabular-nums;
}
.lvr_field input[type="range"] {
  width: 100%;
  margin-top: 0.6rem;
  height: 2rem;
  background: transparent;
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
  touch-action: pan-y;
}
.lvr_field input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(to right, var(--brand-300) var(--fill, 50%), rgb(var(--ivory-rgb) / 0.2) var(--fill, 50%));
}
.lvr_field input[type="range"]::-moz-range-track {
  height: 4px;
  border-radius: 2px;
  background: rgb(var(--ivory-rgb) / 0.2);
}
.lvr_field input[type="range"]::-moz-range-progress {
  height: 4px;
  border-radius: 2px;
  background: var(--brand-300);
}
.lvr_field input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 1.4rem;
  height: 1.4rem;
  margin-top: calc(-0.7rem + 2px);
  border-radius: 50%;
  background: var(--beige-500);
  border: 4px solid var(--brand-500);
}
.lvr_field input[type="range"]::-moz-range-thumb {
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 50%;
  background: var(--beige-500);
  border: 4px solid var(--brand-500);
}
.lvr_result {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid rgb(var(--ivory-rgb) / 0.18);
  border-bottom: 1px solid rgb(var(--ivory-rgb) / 0.18);
}
.lvr_result > div {
  padding: 0.9rem 0;
}
.lvr_result > div + div {
  padding-left: 1.25rem;
  border-left: 1px solid rgb(var(--ivory-rgb) / 0.18);
}
.lvr_result span {
  display: block;
  font-size: var(--fs-small);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgb(var(--ivory-rgb) / 0.65);
}
.lvr_result strong {
  display: block;
  margin-top: 0.3rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

/* the scale: 50% to 100% LVR, zones painted by JS through --line */
.lvr_scale {
  position: relative;
  padding-top: 2.1rem;
  padding-bottom: 2.6rem;
}
.lvr_track {
  position: relative;
  height: 0.75rem;
  border-radius: 999px;
  overflow: hidden;
  background: rgb(var(--ivory-rgb) / 0.12);
}
.lvr_zone {
  position: absolute;
  top: 0;
  bottom: 0;
}
.lvr_zone--ok { background: var(--brand-300); }
.lvr_zone--low { background: var(--brand-500); }
.lvr_zone--tight { background: rgb(var(--ivory-rgb) / 0.35); }
.lvr_zone--out { background: rgb(var(--ivory-rgb) / 0.12); }
.lvr_tick {
  position: absolute;
  top: 2.1rem;
  width: 1px;
  height: 1.35rem;
  background: rgb(var(--ivory-rgb) / 0.55);
  transform: translateX(-0.5px);
}
.lvr_tick span {
  position: absolute;
  top: 1.55rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  white-space: nowrap;
  color: rgb(var(--ivory-rgb) / 0.65);
  font-variant-numeric: tabular-nums;
}
.lvr_tick.is-line { background: var(--beige-500); width: 2px; }
.lvr_tick.is-line span { color: var(--beige-500); font-weight: 500; }
.lvr_pointer {
  position: absolute;
  top: 0;
  left: var(--pos, 60%);
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: left 0.45s var(--ease-expo);
}
.lvr_pointer b {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-small);
  font-variant-numeric: tabular-nums;
  padding: 0.15rem 0.45rem;
  border-radius: 0.25rem;
  background: var(--beige-500);
  color: var(--brand-800);
}
.lvr_pointer::after {
  content: "";
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 7px solid var(--beige-500);
}
.lvr_note {
  font-size: 0.95rem;
  line-height: 1.6;
  min-height: 3.2em;
}
.lvr_note strong { font-weight: 500; color: var(--brand-300); }
.lvr_small {
  font-size: 0.8rem;
  line-height: 1.5;
  color: rgb(var(--ivory-rgb) / 0.6);
}

/* ---------- home page section ---------- */
.learnsec_grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(2.5rem, 6vw, 6rem);
  align-items: start;
}
.learnsec_lede {
  font-size: var(--fs-large);
  line-height: 1.65;
  max-width: 46ch;
}
.learnsec_list {
  list-style: none;
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
  border-top: 1px solid rgb(var(--ink-rgb) / 0.14);
}
.learnsec_link {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr) auto;
  gap: 0 1rem;
  align-items: start;
  padding: 1rem 0;
  border-bottom: 1px solid rgb(var(--ink-rgb) / 0.14);
  transition: padding 0.45s var(--ease-expo), color 0.3s ease;
}
.learnsec_link:hover,
.learnsec_link:focus-visible {
  padding-left: 0.75rem;
  color: var(--brand-600);
}
.learnsec_num {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-small);
  letter-spacing: 0.14em;
  color: var(--brand-600);
  padding-top: 0.2rem;
}
.learnsec_link h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1rem, 1.3vw, 1.15rem);
  line-height: 1.15;
  text-transform: uppercase;
}
.learnsec_link p {
  font-size: 0.95rem;
  line-height: 1.5;
  opacity: 0.72;
  margin-top: 0.2rem;
}
.learnsec_go {
  padding-top: 0.2rem;
  transition: transform 0.45s var(--ease-expo);
}
.learnsec_link:hover .learnsec_go { transform: translateX(4px); }
.learnsec_cta { margin-top: clamp(1.75rem, 3vw, 2.5rem); }

/* ---------- explainers page ---------- */
.learn_grid {
  display: grid;
  grid-template-columns: minmax(0, 0.42fr) minmax(0, 1fr);
  gap: clamp(2.5rem, 6vw, 6rem);
  align-items: start;
}
.learn_toc {
  position: sticky;
  top: calc(var(--nav-h) + 2rem);
}
.learn_toc .u-eyebrow { opacity: 0.55; display: block; margin-bottom: 1rem; }
.learn_toc ol {
  list-style: none;
  border-top: 1px solid rgb(var(--ink-rgb) / 0.14);
}
.learn_toc a {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  padding: 0.8rem 0 0.8rem 0.75rem;
  border-bottom: 1px solid rgb(var(--ink-rgb) / 0.14);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.2;
  text-transform: uppercase;
  position: relative;
  opacity: 0.55;
  transition: opacity 0.3s ease;
}
/* the number only: the label is the second span and may hold a .u-macron */
.learn_toc a > span:first-child { color: var(--brand-600); font-size: var(--fs-small); letter-spacing: 0.12em; padding-top: 0.1rem; }
.learn_toc a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--brand-500);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.5s var(--ease-expo);
}
.learn_toc a:hover,
.learn_toc a.is-active { opacity: 1; }
.learn_toc a.is-active::before { transform: scaleY(1); }
.learn_toc_note {
  margin-top: 1.25rem;
  font-size: var(--fs-small);
  line-height: 1.6;
  opacity: 0.7;
  max-width: 32ch;
}

.explainer {
  padding: clamp(2.5rem, 6vh, 4rem) 0;
  border-bottom: 1px solid rgb(var(--ink-rgb) / 0.14);
  scroll-margin-top: calc(var(--nav-h) + 1rem);
}
.explainer:first-child { padding-top: 0; }
.explainer_kicker { display: block; color: var(--brand-600); margin-bottom: 0.9rem; }
.explainer_title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.75rem, 3vw, 2.6rem);
  line-height: 1;
  text-transform: uppercase;
  max-width: 22ch;
}
.explainer_lede {
  margin-top: 1.1rem;
  font-size: var(--fs-sub);
  line-height: 1.45;
  max-width: 44ch;
}
.explainer_body {
  margin-top: clamp(1.5rem, 3vw, 2rem);
  max-width: 62ch;
}
/* direct children only: the LVR gauge sits inside .explainer_body and keeps
   its own (ivory-on-navy) type */
.explainer_body > p {
  line-height: 1.7;
  opacity: 0.86;
}
.explainer_body > p + p,
.explainer_body > .lvr + p { margin-top: 1rem; }
.explainer_body > p strong { font-weight: 500; color: var(--brand-800); }
.explainer_body > h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-main);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin: 1.75rem 0 0.75rem;
}
.explainer_body .lvr { margin: 1.75rem 0; }
.explainer_table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.5rem 0 1.25rem;
  font-size: 0.95rem;
}
.explainer_table th,
.explainer_table td {
  text-align: left;
  padding: 0.75rem 0.5rem 0.75rem 0;
  border-bottom: 1px solid rgb(var(--ink-rgb) / 0.14);
}
.explainer_table th {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-small);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.6;
}
.explainer_table td:last-child {
  font-family: var(--font-display);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.explainer_list {
  list-style: none;
  margin: 0.25rem 0 0.5rem;
}
.explainer_list li {
  display: flex;
  gap: 0.75rem;
  padding: 0.35rem 0;
  line-height: 1.6;
  opacity: 0.86;
}
.explainer_list svg { flex: none; margin-top: 0.35em; color: var(--brand-500); }
.explainer_take {
  margin-top: clamp(1.75rem, 3vw, 2.25rem);
  padding: clamp(1.25rem, 2.5vw, 1.9rem);
  border-radius: 0.6rem;
  background: var(--sand-200);
  max-width: 62ch;
}
.explainer_take h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-small);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brand-600);
  margin-bottom: 0.6rem;
}
.explainer_take .explainer_list li { opacity: 1; }
.explainer_foot {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 62ch;
}
.explainer_related {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--fs-small);
}
.explainer_related > span {
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.6;
  margin-right: 0.25rem;
}
.explainer_related a {
  display: inline-flex;
  align-items: center;
  min-height: 2.5rem;
  padding: 0 0.9rem;
  border-radius: 999px;
  border: 1px solid rgb(var(--ink-rgb) / 0.2);
  transition: background 0.3s ease, color 0.3s ease;
}
.explainer_related a:hover {
  background: var(--brand-800);
  color: var(--beige-500);
}
.explainer_meta {
  font-size: var(--fs-small);
  line-height: 1.6;
  opacity: 0.6;
}

/* ---------- preview only: figures the copy marks [VERIFY] ---------- */
[data-preview] .verify {
  background: rgb(255 196 0 / 0.22);
  box-shadow: inset 0 -2px 0 rgb(214 150 0);
  border-radius: 2px;
}
[data-preview] .verify::after {
  content: "VERIFY";
  font-family: var(--font-body);
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  vertical-align: super;
  margin-left: 0.25rem;
  padding: 0.05rem 0.3rem;
  border-radius: 2px;
  background: rgb(214 150 0);
  color: #fff;
}

/* ---------- responsive ---------- */
@media (max-width: 991px) {
  .learnsec_grid,
  .learn_grid { grid-template-columns: minmax(0, 1fr); }
  .learn_toc { position: static; }
}
@media (max-width: 479px) {
  .lvr_tabs { align-self: stretch; }
  .lvr_tab {
    flex: auto;
    padding: 0 0.6rem;
    font-size: 0.75rem;
    letter-spacing: 0.04em;
    white-space: nowrap;
  }
  .lvr_tick span { font-size: 0.68rem; }
}
@media (prefers-reduced-motion: reduce) {
  .lvr_pointer,
  .learnsec_link,
  .learnsec_go,
  .learn_toc a::before { transition: none; }
}