/*
 * Copyrighted: Learn — the index (page-learn.php) and an article
 * (page-learn-article.php), loaded on those pages only, after base.css.
 * The article reads like a long-form note: a 68ch measure, the table of
 * contents pinned beside it from 1100 px, and the field specimen set as a
 * museum label on the certificate's ivory paper with the gold seal.
 */

/* ── Learn cards: the arrow, and the three-up row ────────── */
.lc { position: relative; padding-bottom: 44px; }
.lc-more { position: absolute; left: 20px; bottom: 16px; color: var(--gold); font: 400 18px/1 var(--mono); transition: transform .3s var(--ease-out); }
.lc:hover .lc-more, .lc:focus-visible .lc-more { transform: translateX(4px); }
.lc h2 { font-size: 18px; line-height: 1.2; font-weight: 600; letter-spacing: -.01em; }

/* ── The index ───────────────────────────────────────────── */
.lx .pg-head { padding-bottom: clamp(32px, 4vw, 56px); }
.lx-layers { padding-bottom: clamp(48px, 6vw, 88px); }
.lx-layers-grid { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 2.2fr); gap: clamp(24px, 4vw, 56px); align-items: start;
  padding: clamp(24px, 3vw, 36px); border: 1px solid var(--line); border-radius: 26px;
  background: linear-gradient(135deg, rgba(214, 178, 94, .08), var(--ink-2) 55%); }
.lx-layers-text h2 { font-size: clamp(28px, 3vw, 40px); }
.lx-layers-text p { margin: 14px 0 0; color: var(--muted); font-size: 15.5px; }
.lx-plates { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.lx-plate { display: grid; gap: 10px; align-content: start; padding: 20px; border-radius: 18px; background: var(--ink); border: 1px solid var(--line); }
.lx-plate p { margin: 0; color: var(--muted); font-size: 14.5px; line-height: 1.5; }
.lx-plate .ghost { justify-self: start; font-size: 14px; }
.lx-layer { font: 700 30px/1 var(--serif); background: var(--foil); -webkit-background-clip: text; background-clip: text; color: transparent; }

.lx-group { padding-bottom: clamp(48px, 6vw, 80px); }
.lx-group-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  padding-bottom: 16px; margin-bottom: 22px; border-bottom: 1px solid var(--line); }
.lx-group-head h2 { font-size: clamp(28px, 3.2vw, 44px); }
.lx-cards { grid-template-columns: repeat(3, 1fr); }

.lx-check { padding-top: clamp(16px, 3vw, 40px); }
.lx-check-card { display: flex; gap: clamp(20px, 3vw, 36px); align-items: center; padding: clamp(24px, 4vw, 48px); border-radius: 28px;
  border: 1px solid rgba(214, 178, 94, .45); background: linear-gradient(135deg, rgba(214, 178, 94, .14), var(--ink-2) 62%); }
.lx-check-seal { flex: none; width: 96px; height: 96px; border-radius: 50%; background: var(--foil); display: grid; place-items: center;
  font: 700 48px/1 var(--serif); color: #3a2a08; box-shadow: inset 0 0 0 5px rgba(255, 255, 255, .25), 0 18px 40px rgba(214, 178, 94, .2); }
.lx-check-text { display: grid; gap: 14px; }
.lx-check-text h2 { font-size: clamp(30px, 3.4vw, 48px); }
.lx-check-text p { margin: 0; color: var(--muted); max-width: 44em; }
.lx-check-links { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; margin-top: 6px; }
.lx-legal { margin: 22px 0 0; font: 400 13px/1.5 var(--mono); color: var(--muted); }

/* ── An article: the head ────────────────────────────────── */
.la-top { padding-block: clamp(24px, 3vw, 40px) clamp(28px, 4vw, 56px);
  background: radial-gradient(ellipse at 85% 0, rgba(214, 178, 94, .08), transparent 55%); }
.la-top .crumbs { margin-bottom: clamp(24px, 4vw, 44px); }
.la-head { display: grid; gap: clamp(28px, 4vw, 56px); align-items: start; }
.la-head.has-spec { grid-template-columns: minmax(0, 1.35fr) minmax(300px, .85fr); }
.la-intro { display: grid; gap: 18px; max-width: 820px; }
.la-kicker { color: var(--gold); }
.la-intro h1 { font-size: clamp(38px, 5vw, 68px); line-height: 1.02; }
.la-intro .lede { max-width: 40em; font-size: clamp(17px, 1.45vw, 20px); }
.la-by { margin: 0; font: 500 12px/1.4 var(--mono); letter-spacing: .08em; color: var(--muted); }

/* The field specimen: a museum label on the certificate's paper. */
.spec { position: relative; background: var(--paper); color: var(--paper-ink); border-radius: 6px; padding: 30px 28px 26px;
  box-shadow: 0 34px 80px rgba(0, 0, 0, .45); background-image: radial-gradient(circle at 100% 0, rgba(214, 178, 94, .2), transparent 42%);
  transform: rotate(.6deg); }
.spec::before { content: ""; position: absolute; inset: 9px; border: 1px solid rgba(176, 138, 60, .5); border-radius: 3px; pointer-events: none; }
.spec::after { content: ""; position: absolute; inset: 13px; border: 1px dashed rgba(176, 138, 60, .32); border-radius: 2px; pointer-events: none; }
.spec > * { position: relative; }
.spec-head { display: flex; justify-content: space-between; align-items: start; gap: 16px; }
.spec-k { margin: 4px 0 0; font: 500 10.5px/1.5 var(--mono); letter-spacing: .22em; text-transform: uppercase; color: var(--paper-muted); }
.spec-seal { flex: none; width: 58px; height: 58px; border-radius: 50%; background: var(--foil); display: grid; place-items: center; margin: -8px -6px 0 0;
  font: 700 30px/1 var(--serif); color: #3a2a08; box-shadow: inset 0 0 0 3px rgba(255, 255, 255, .28), 0 6px 14px rgba(0, 0, 0, .18); }
.spec-tag { margin: 6px 0 0; }
.spec-tag code { font: 500 clamp(22px, 2.2vw, 28px)/1.15 var(--mono); letter-spacing: -.01em; color: #6b4f12; overflow-wrap: anywhere; }
.spec-name { margin: 6px 0 16px; font: 700 clamp(24px, 2.4vw, 30px)/1.1 var(--serif); letter-spacing: -.015em; color: var(--paper-ink); }
.spec-rows { margin: 0; display: grid; border-top: 1px solid rgba(29, 27, 22, .16); }
.spec-rows > div { display: grid; grid-template-columns: 86px 1fr; gap: 12px; padding: 9px 0; border-bottom: 1px solid rgba(29, 27, 22, .09); }
.spec-rows dt { font: 500 10.5px/1.7 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--paper-muted); }
.spec-rows dd { margin: 0; font-size: 14px; line-height: 1.45; color: var(--paper-ink); }
.spec-rows ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 3px; }
.spec-rows li { padding-left: 14px; position: relative; }
.spec-rows li::before { content: "·"; position: absolute; left: 2px; color: var(--gold-deep); font-weight: 700; }

/* ── An article: contents and text ───────────────────────── */
.la-layout { display: grid; gap: 28px; padding-top: clamp(8px, 2vw, 24px); padding-bottom: clamp(56px, 7vw, 96px); }
.la-body { min-width: 0; max-width: 68ch; }
@media (min-width: 1100px) {
  .la-layout.has-toc { grid-template-columns: 250px minmax(0, 68ch); gap: 72px; justify-content: start; }
}

.toc details { border: 1px solid var(--line); border-radius: 18px; background: var(--ink-2); padding: 0 20px; }
.toc summary { cursor: pointer; list-style: none; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 16px 0; }
.toc summary::-webkit-details-marker { display: none; }
.toc summary::after { content: "+"; font: 400 20px/1 var(--mono); color: var(--gold); transition: transform .3s; }
.toc details[open] summary::after { transform: rotate(45deg); }
.toc summary .tag { color: var(--text); }
.toc ol { margin: 0; padding: 0 0 18px; list-style: none; counter-reset: toc; display: grid; gap: 2px; }
.toc li { counter-increment: toc; }
.toc a { display: grid; grid-template-columns: 30px 1fr; padding: 7px 0; text-decoration: none; color: var(--muted); font-size: 15px; line-height: 1.35; transition: color .2s; }
.toc a::before { content: counter(toc, decimal-leading-zero); font: 500 10px/2.1 var(--mono); letter-spacing: .08em; color: var(--muted); transition: color .2s; }
.toc a:hover, .toc a[aria-current] { color: var(--text); }
.toc a[aria-current]::before { color: var(--gold); }
@media (min-width: 1100px) {
  .toc { position: sticky; top: 96px; align-self: start; max-height: calc(100vh - 120px); overflow-y: auto; }
  .toc details { border: 0; background: none; padding: 0; }
  .toc summary { cursor: default; pointer-events: none; padding: 4px 0 14px; }
  .toc summary::after { display: none; }
  .toc ol { border-left: 1px solid var(--line); padding: 0 0 0 16px; }
  .toc a { position: relative; }
  .toc a[aria-current]::after { content: ""; position: absolute; left: -17px; top: 8px; bottom: 8px; width: 2px; border-radius: 2px; background: var(--gold);
    box-shadow: 0 0 10px rgba(214, 178, 94, .6); }
}

/* The long-form text. */
.la-body { font-size: 18px; line-height: 1.75; color: rgba(238, 240, 245, .9); }
.la-body section + section { margin-top: 2.4em; }
.la-body section > * { margin: 0; }
.la-body section > * + * { margin-top: 1.1em; }
.la-body h2 { font-size: clamp(27px, 2.8vw, 36px); line-height: 1.08; scroll-margin-top: 96px; }
.la-body h2 + * { margin-top: .75em; }
.la-body > section:first-child > p:first-of-type { font-size: clamp(19px, 1.55vw, 20.5px); line-height: 1.65; color: var(--text); }
.la-body strong { color: var(--text); font-weight: 600; }
.la-body em { font-style: italic; }
.la-body a { color: var(--gold-hi); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: .22em;
  text-decoration-color: rgba(214, 178, 94, .5); transition: text-decoration-color .2s, color .2s; }
.la-body a:hover { color: var(--text); text-decoration-color: var(--gold); }
.la-body code { font: 500 .84em/1.5 var(--mono); padding: .1em .38em; border-radius: 6px; background: var(--ink-3); color: var(--gold-hi);
  border: 1px solid var(--line); overflow-wrap: anywhere; }
.la-body ul, .la-body ol { padding: 0; list-style: none; display: grid; gap: .55em; }
.la-body li { position: relative; padding-left: 30px; }
.la-body ul > li::before { content: "©"; position: absolute; left: 2px; top: 0; color: var(--gold); font: 600 .9em/1.95 var(--serif); }
.la-body ol { counter-reset: li; }
.la-body ol > li { counter-increment: li; padding-left: 42px; }
.la-body ol > li::before { content: counter(li, decimal-leading-zero); position: absolute; left: 0; top: .22em; width: 28px; height: 28px;
  display: grid; place-items: center; border-radius: 50%; border: 1px solid var(--line-2); font: 500 10px/1 var(--mono); letter-spacing: .04em; color: var(--gold-hi); }

/* The steps: a real sequence, numbered, on cards. */
.la-body ol.la-steps { gap: 10px; }
.la-body .la-steps > li { padding: 16px 18px 16px 62px; border: 1px solid var(--line); border-radius: 16px; background: var(--ink-2); line-height: 1.55; font-size: 17px; }
.la-body .la-steps > li::before { left: 18px; top: 15px; background: var(--foil); color: #2d2006; border: 0; font-weight: 600; }

.la-faq { margin-top: 1.1em; }
.la-faq summary { font-size: 18px; }
.la-faq details p { font-size: 16px; line-height: 1.65; }
.la-faq a { color: var(--gold-hi); }

/* ── Related and the closing call ────────────────────────── */
.la-related { padding-top: clamp(56px, 7vw, 96px); border-top: 1px solid var(--line); }
.la-related-head { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; margin-bottom: 26px; }
.la-related-head h2 { font-size: clamp(28px, 3vw, 40px); }
.la-cards { grid-template-columns: repeat(3, 1fr); }
.la-cta h2 { font-size: clamp(34px, 4.4vw, 58px); }
.la-cta-links { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; align-items: center; }

@media (max-width: 1099.98px) {
  .toc { max-width: 68ch; }
}
@media (max-width: 960px) {
  .la-head.has-spec { grid-template-columns: 1fr; }
  .spec { max-width: 520px; transform: none; }
  .lx-layers-grid { grid-template-columns: 1fr; }
  .lx-cards, .la-cards { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .lx-plates { grid-template-columns: 1fr; }
  .lx-check-card { flex-direction: column; align-items: flex-start; }
  .lx-check-seal { width: 68px; height: 68px; font-size: 34px; }
}
@media (max-width: 620px) {
  .lx-cards, .la-cards { grid-template-columns: 1fr; }
  .la-body { font-size: 17px; }
  .spec { padding: 26px 22px 22px; }
  .spec-rows > div { grid-template-columns: 1fr; gap: 2px; }
  .la-body .la-steps > li { padding-left: 56px; }
  .la-body .la-steps > li::before { left: 14px; }
}