/* ==========================================================================
   Learn — eight modules stacked as alternating bands, each with a numbered
   gutter. Educational without being childish: generous type, clear flags,
   a glossary, an accordion and question cards.
   ========================================================================== */

/* ---------------- Page head ---------------- */
.ln-head { padding-block: clamp(2.5rem, 5vw, 4rem) clamp(3rem, 6vw, 5rem); }
.ln-head__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
}
.ln-head__title {
  font-family: var(--display);
  font-size: clamp(3rem, 9vw, 6.5rem);
  line-height: .95;
  letter-spacing: -.03em;
  color: var(--ink);
}
.ln-head__lede { margin-top: 1.6rem; max-width: 54ch; }

.ln-toc {
  border: 1px solid var(--rule);
  border-top: 3px solid var(--oxblood);
  background: var(--paper-warm);
  padding: clamp(1.2rem, 2.5vw, 1.8rem);
}
.ln-toc__h {
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 1rem;
}
.ln-toc ol { list-style: none; margin: 0; padding: 0; display: grid; }
.ln-toc a {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr);
  gap: .6rem;
  align-items: baseline;
  padding-block: .62rem;
  border-top: 1px solid var(--rule-soft);
  text-decoration: none;
  font-size: .93rem;
  color: var(--ink-soft);
  transition: color .3s var(--ease), padding-left .3s var(--ease);
}
.ln-toc a:hover, .ln-toc a:focus-visible { color: var(--oxblood); padding-left: .35rem; }
.ln-toc .numeral { font-family: var(--mono); font-size: .7rem; color: var(--brass-ink); }

@media (max-width: 900px) {
  .ln-head__grid { grid-template-columns: minmax(0, 1fr); }
}

/* ---------------- Module frame ---------------- */
.ln-mod { padding-block: clamp(3rem, 6vw, 5.5rem); }
.ln-mod + .ln-mod { border-top: 1px solid var(--rule); }
.ln-mod.bg-night + .ln-mod, .ln-mod + .ln-mod.bg-night { border-top-color: var(--rule-night); }

.ln-mod__grid {
  display: grid;
  grid-template-columns: clamp(4rem, 9vw, 8rem) minmax(0, 1fr);
  gap: clamp(1.2rem, 3vw, 3rem);
  align-items: start;
}
.ln-mod__mark {
  font-family: var(--display);
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--oxblood);
  position: sticky;
  top: 6.5rem;
}
.ln-mod__mark--night { -webkit-text-stroke-color: var(--brass); }

.ln-mod__h { font-size: clamp(1.7rem, 3.4vw, 2.6rem); margin-bottom: 1.4rem; }
.ln-mod__intro { font-size: 1.02rem; line-height: 1.7; color: var(--ink-mute); max-width: 60ch; margin-bottom: 1.8rem; }
.bg-night .ln-mod__intro { color: var(--night-mute); }
.ln-prose p { max-width: 64ch; font-size: 1.02rem; line-height: 1.8; }
.ln-mod__fig { max-width: 26rem; margin-top: 2rem; }
.ln-mod__note {
  margin-top: 1.8rem;
  font-family: var(--mono);
  font-size: .76rem;
  line-height: 1.75;
  color: var(--ink-faint);
  max-width: 62ch;
  border-top: 1px solid var(--rule);
  padding-top: 1rem;
}
.ln-mod__link { margin-top: 1.8rem; }

@media (max-width: 760px) {
  .ln-mod__grid { grid-template-columns: minmax(0, 1fr); }
  .ln-mod__mark { position: static; }
}

/* ---------------- M2 numbered steps + flag ---------------- */
.ln-steps { display: grid; list-style: none; margin: 1.8rem 0 0; padding: 0; border-top: 1px solid var(--rule); max-width: 62rem; }
.ln-steps li {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  gap: 1rem;
  align-items: baseline;
  padding-block: .95rem;
  border-bottom: 1px solid var(--rule);
  font-size: .98rem;
  line-height: 1.7;
  color: var(--ink-soft);
}
.ln-steps__n { font-family: var(--display); font-size: 1.3rem; color: var(--brass-ink); }

.ln-flag {
  margin-top: 2rem;
  border: 1px solid var(--oxblood);
  border-left-width: 4px;
  background: rgba(124, 35, 24, .05);
  padding: clamp(1.1rem, 2.4vw, 1.7rem);
  max-width: 64ch;
}
.ln-flag__label {
  font-family: var(--mono);
  font-size: .64rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--oxblood);
  margin-bottom: .8rem;
}
.ln-flag__t { font-size: .98rem; line-height: 1.75; color: var(--ink-soft); }
.ln-flag__t strong { color: var(--ink); }

/* ---------------- M3 trio ---------------- */
.ln-trio {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  list-style: none;
  margin: 1.8rem 0 0;
  padding: 0;
  border-top: 2px solid var(--ink);
}
.ln-trio li {
  padding: 1.2rem clamp(.8rem, 1.5vw, 1.3rem) 1.6rem 0;
  border-bottom: 1px solid var(--rule);
}
.ln-trio li + li { padding-left: clamp(.8rem, 1.5vw, 1.3rem); border-left: 1px solid var(--rule); }
.ln-trio__life { font-family: var(--mono); font-size: .68rem; letter-spacing: .15em; color: var(--ink-faint); margin-bottom: .6rem; }
.ln-trio__name { font-family: var(--display); font-size: clamp(1.15rem, 1.8vw, 1.4rem); color: var(--ink); margin-bottom: .6rem; }
.ln-trio__t { font-size: .9rem; line-height: 1.68; color: var(--ink-mute); }

@media (max-width: 820px) {
  .ln-trio { grid-template-columns: minmax(0, 1fr); }
  .ln-trio li, .ln-trio li + li { padding-left: 0; border-left: 0; }
}

/* ---------------- M4 glossary ---------------- */
.glossary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(1.5rem, 3.5vw, 3.5rem);
  margin: 0;
  border-top: 1px solid var(--rule-night);
}
.glossary > div {
  display: grid;
  gap: .35rem;
  padding-block: 1rem;
  border-bottom: 1px solid var(--rule-night);
}
.glossary dt {
  font-family: var(--display);
  font-size: 1.1rem;
  color: var(--brass-lt);
}
.glossary dd { margin: 0; font-size: .92rem; line-height: 1.68; color: var(--night-text); }

@media (max-width: 760px) {
  .glossary { grid-template-columns: minmax(0, 1fr); }
}

/* ---------------- M5 compact timeline ---------------- */
.ln-tl { display: grid; list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--rule); max-width: 64rem; }
.ln-tl li {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  gap: 1.2rem;
  align-items: baseline;
  padding-block: .85rem;
  border-bottom: 1px solid var(--rule);
  font-size: .95rem;
  line-height: 1.7;
  color: var(--ink-soft);
}
.ln-tl__y { font-family: var(--display); font-size: 1.15rem; color: var(--oxblood); }
.ln-tl li.is-ctx { background: var(--paper-warm); }
.ln-tl li.is-ctx .ln-tl__y { color: var(--brass-ink); }
.ln-tl em { font-style: italic; color: var(--ink); }

@media (max-width: 560px) {
  .ln-tl li { grid-template-columns: minmax(0, 1fr); gap: .3rem; }
}

/* ---------------- M6 accordion ---------------- */
.acc { border-top: 1px solid var(--rule); max-width: 64rem; }
.acc__item { border-bottom: 1px solid var(--rule); }
.acc__item h3 { margin: 0; font-family: var(--body); }
.acc__item button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  width: 100%;
  text-align: left;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 1.25rem .2rem;
  font-family: var(--display);
  font-size: clamp(1.08rem, 1.8vw, 1.35rem);
  line-height: 1.3;
  color: var(--ink);
  transition: color .3s var(--ease);
}
.acc__item button:hover { color: var(--oxblood); }

.acc__sign { position: relative; flex: none; width: 14px; height: 14px; }
.acc__sign::before, .acc__sign::after {
  content: "";
  position: absolute;
  background: var(--oxblood);
  transition: transform .35s var(--ease), opacity .3s var(--ease);
}
.acc__sign::before { top: 6px; left: 0; width: 14px; height: 1.5px; }
.acc__sign::after  { left: 6px; top: 0; width: 1.5px; height: 14px; }
.acc__item button[aria-expanded="true"] .acc__sign::after { transform: scaleY(0); opacity: 0; }

.acc__panel { padding: 0 .2rem 1.5rem; }
.acc__panel[hidden] { display: none; }
.acc__panel p { font-size: .98rem; line-height: 1.8; color: var(--ink-mute); max-width: 66ch; }
.acc__panel em { font-style: italic; }

/* ---------------- M7 myths ---------------- */
.myths { display: grid; list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--rule-night); max-width: 68rem; }
.myths li {
  display: grid;
  gap: .8rem;
  padding-block: 1.3rem;
  border-bottom: 1px solid var(--rule-night);
}
.myths__tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: .58rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  border: 1px solid var(--oxblood-br);
  color: var(--oxblood-br);
  padding: .2rem .5rem;
  margin-right: .7rem;
  vertical-align: .12em;
}
.myths__tag--ok { border-color: var(--brass-lt); color: var(--brass-lt); }
.myths__claim { font-size: .98rem; line-height: 1.7; color: var(--night-mute); }
.myths__fact { font-size: .98rem; line-height: 1.75; color: var(--night-text); }

.ln-method {
  margin-top: 2.2rem;
  border: 1px solid var(--rule-night);
  background: rgba(42, 34, 26, .5);
  padding: clamp(1.3rem, 2.6vw, 2rem);
  max-width: 64ch;
}
.ln-method__h {
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--brass-lt);
  margin-bottom: 1.1rem;
}
.ln-method ol { padding-left: 1.2rem; display: grid; gap: .7rem; }
.ln-method li { font-size: .95rem; line-height: 1.72; color: var(--night-text); }
.ln-method li::marker { color: var(--brass); }
.ln-method strong { color: var(--paper); }

/* ---------------- M8 question cards ---------------- */
.qgrid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1.2rem, 2.5vw, 2rem);
}
.qcard {
  border: 1px solid var(--rule);
  border-top: 3px solid var(--brass);
  background: var(--paper-warm);
  padding: clamp(1.3rem, 2.6vw, 2rem);
}
.qcard__level {
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--oxblood);
  margin-bottom: 1.1rem;
}
.qcard ul { display: grid; gap: .9rem; list-style: none; margin: 0; padding: 0; }
.qcard li {
  font-size: .94rem;
  line-height: 1.7;
  color: var(--ink-mute);
  padding-left: 1.1rem;
  position: relative;
}
.qcard li::before {
  content: "";
  position: absolute;
  left: 0; top: .62em;
  width: .35rem; height: .35rem;
  background: var(--brass);
  border-radius: 50%;
}
.qcard em { font-style: italic; color: var(--ink); }

.ln-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: clamp(1.5rem, 3vw, 3rem);
  align-items: center;
  margin-top: clamp(2.2rem, 4vw, 3.2rem);
  padding-top: clamp(1.8rem, 3.5vw, 2.6rem);
  border-top: 1px solid var(--rule);
}
.ln-next__t { font-size: 1.02rem; line-height: 1.7; color: var(--ink-mute); max-width: 46ch; }
.ln-next__btns { display: flex; flex-wrap: wrap; gap: .8rem; }

@media (max-width: 820px) {
  .qgrid { grid-template-columns: minmax(0, 1fr); }
  .ln-next { grid-template-columns: minmax(0, 1fr); }
}