.learn-page { padding: 118px 0 72px; text-align: left; }
.learn-page h1,
.learn-page h2,
.learn-page .learn-read,
.learn-page .learn-kicker,
.learn-page .learn-lead,
.learn-page .learn-prose,
.learn-page .takeaway,
.learn-page .formula,
.learn-page .stage-copy,
.learn-page .ion-copy,
.learn-page .tank-copy,
.learn-page .hist-copy,
.learn-page .cross-copy {
  width: 100%;
  max-width: none;
  margin-inline: 0;
  justify-self: stretch;
  text-align: center;
}
.learn-page .card,
.learn-page .card p,
.learn-page .card strong,
.learn-page details,
.learn-page summary { text-align: center; }
.learn-toc, .stage-row, .ion-row, .choice-row, .learn-actions, .price-line { justify-content: center; }
.learn-page .takeaway { border-left: 4px solid var(--copper); }
.learn-page .wrap { display: grid; gap: 18px; }
.learn-page .wrap + .wrap { margin-top: 28px; }
.learn-kicker { margin-bottom: 0; }
.learn-page h1 { margin: 0; font-size: clamp(40px, 8vw, 76px); line-height: .9; letter-spacing: -.07em; }
.learn-page h2 { margin: 0; font-size: clamp(30px, 5vw, 48px); line-height: .94; letter-spacing: -.06em; }
.learn-lead { margin: 0; max-width: none; color: var(--muted); font-size: 18px; line-height: 1.5; font-weight: 620; }
.learn-read { margin: 0; color: var(--hot); font-size: 13px; font-weight: 850; letter-spacing: .04em; text-transform: uppercase; }
.learn-toc { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 4px; }
.learn-toc a { flex: 0 0 auto; padding: 8px 12px; border: 1px solid rgba(255,255,255,.14); border-radius: 999px; color: rgba(245,240,231,.82); font-size: 13px; font-weight: 800; }
.learn-prose { margin: 0; max-width: none; color: rgba(245,240,231,.88); font-size: 17px; line-height: 1.55; font-weight: 600; }
.learn-prose + .learn-prose { margin-top: 14px; }
.media-pair { display: grid; gap: 36px; margin-top: 12px; }
.media-pair figure { margin: 0; display: grid; gap: 12px; }
.media-pair h3 { margin: 0; text-align: center; font-size: 22px; letter-spacing: -.04em; }
.media-pair img, .media-pair video { width: 100%; border-radius: 22px; }
.takeaway { margin: 0; padding: 16px 18px; border-left: 4px solid var(--copper); border-radius: 18px; background: rgba(239,113,48,.1); color: var(--text); font-size: 18px; line-height: 1.4; font-weight: 750; }
.plate { margin: 0; padding: 12px; border-radius: 28px; background: #f4f7fb; color: #172033; }
.plate svg { display: block; width: 100%; height: auto; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

.benchy-frame { overflow: hidden; width: min(820px, 100%); margin-inline: auto; aspect-ratio: 2.4 / 1; border-radius: 22px; background: #111; }
.benchy-frame img { width: 100%; height: 100%; display: block; object-fit: cover; object-position: center 46%; }
.kit-shot { margin: 0; }
.kit-shot img { width: min(720px, 100%); height: auto; border-radius: 22px; background: #fff; }
.kit-shot figcaption { margin-top: 8px; color: var(--hot); font-weight: 800; }
body:has(.learn-page) .fall-sale { display: none; }
.stage-row, .ion-row, .choice-row { display: flex; flex-wrap: wrap; gap: 8px; }
.stage-row label, .ion-row label, .choice-row label, .time-btn {
  min-height: 44px;
  padding: 10px 14px;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 999px;
  background: rgba(255,255,255,.04);
  color: var(--text);
  font: inherit;
  font-size: 13px;
  font-weight: 850;
  letter-spacing: .04em;
  cursor: pointer;
}
.stage-copy p, .ion-copy p, .cross-copy p, .hist-copy p, .tank-copy p { display: none; margin: 0; }
#bench-print:checked ~ .stage-row label[for="bench-print"],
#bench-paint:checked ~ .stage-row label[for="bench-paint"],
#bench-plate:checked ~ .stage-row label[for="bench-plate"],
#bench-polish:checked ~ .stage-row label[for="bench-polish"],
#ion-1:checked ~ .ion-row label[for="ion-1"],
#ion-2:checked ~ .ion-row label[for="ion-2"],
#ion-3:checked ~ .ion-row label[for="ion-3"],
#ion-4:checked ~ .ion-row label[for="ion-4"],
#ion-5:checked ~ .ion-row label[for="ion-5"],
#cross-before:checked ~ .choice-row label[for="cross-before"],
#cross-after:checked ~ .choice-row label[for="cross-after"],
#hist-1800:checked ~ .hist-row label[for="hist-1800"],
#hist-1805:checked ~ .hist-row label[for="hist-1805"],
#hist-1840:checked ~ .hist-row label[for="hist-1840"],
#hist-1900:checked ~ .hist-row label[for="hist-1900"],
#hist-today:checked ~ .hist-row label[for="hist-today"],
#tank-anode:checked ~ .choice-row label[for="tank-anode"],
#tank-cathode:checked ~ .choice-row label[for="tank-cathode"],
#tank-bath:checked ~ .choice-row label[for="tank-bath"],
#tank-supply:checked ~ .choice-row label[for="tank-supply"],
#tank-ions:checked ~ .choice-row label[for="tank-ions"],
#hist-1800:checked ~ .hist-row label[for="hist-1800"],
#hist-1805:checked ~ .hist-row label[for="hist-1805"],
#hist-1840:checked ~ .hist-row label[for="hist-1840"],
#hist-1900:checked ~ .hist-row label[for="hist-1900"],
#hist-today:checked ~ .hist-row label[for="hist-today"] {
  background: var(--copper);
  color: #170805;
  border-color: var(--copper);
}
#bench-print:checked ~ .stage-copy .for-print,
#bench-paint:checked ~ .stage-copy .for-paint,
#bench-plate:checked ~ .stage-copy .for-plate,
#bench-polish:checked ~ .stage-copy .for-polish,
#ion-1:checked ~ .ion-copy .for-1,
#ion-2:checked ~ .ion-copy .for-2,
#ion-3:checked ~ .ion-copy .for-3,
#ion-4:checked ~ .ion-copy .for-4,
#ion-5:checked ~ .ion-copy .for-5,
#cross-before:checked ~ .cross-copy .for-before,
#cross-after:checked ~ .cross-copy .for-after,
#hist-1800:checked ~ .hist-art .for-1800,
#hist-1805:checked ~ .hist-art .for-1805,
#hist-1840:checked ~ .hist-art .for-1840,
#hist-1900:checked ~ .hist-art .for-1900,
#hist-today:checked ~ .hist-art .for-today,
#tank-anode:checked ~ .tank-copy .for-anode,
#tank-cathode:checked ~ .tank-copy .for-cathode,
#tank-bath:checked ~ .tank-copy .for-bath,
#tank-supply:checked ~ .tank-copy .for-supply,
#tank-ions:checked ~ .tank-copy .for-ions { display: block; }

.ion-stage { display: grid; }
.ion-stage .step { display: none; }
#ion-1:checked ~ .ion-stage .step-1,
#ion-2:checked ~ .ion-stage .step-2,
#ion-3:checked ~ .ion-stage .step-3,
#ion-4:checked ~ .ion-stage .step-4,
#ion-5:checked ~ .ion-stage .step-5 { display: block; }
#cross-after:checked ~ .cross-stage .copper-coat { opacity: 1; }
.cross-stage .copper-coat { opacity: 0; }
#hist-1800:checked ~ .hist-art .y1800,
#hist-1805:checked ~ .hist-art .y1805,
#hist-1840:checked ~ .hist-art .y1840,
#hist-1900:checked ~ .hist-art .y1900,
#hist-today:checked ~ .hist-art .ytoday { outline: 2px solid var(--copper); }
.hist-art { display: grid; gap: 10px; }
.hist-art svg { width: 100%; height: auto; background: #f4f7fb; border-radius: 18px; }
.formula { margin: 0; padding: 14px 16px; border-radius: 16px; background: rgba(255,255,255,.06); font-size: clamp(22px, 4vw, 34px); letter-spacing: -.04em; font-weight: 800; }
.formula span { color: #7eb6ff; }
.formula b { color: var(--hot); font-weight: 800; }
.learn-video { width: 100%; border-radius: 22px; background: #050609; aspect-ratio: 16 / 9; object-fit: contain; }
.kit-photo { width: 100%; border-radius: 22px; background: #fff; }
.learn-split { display: grid; gap: 14px; }
.learn-page details { border: 1px solid rgba(255,255,255,.12); border-radius: 18px; background: rgba(255,255,255,.04); }
.learn-page summary { cursor: pointer; padding: 14px 16px; font-weight: 800; }
.learn-page details p { margin: 0; padding: 0 16px 16px; color: var(--muted); line-height: 1.5; font-weight: 620; }
.learn-page .card p { margin: 8px 0 0; color: var(--muted); line-height: 1.5; font-weight: 620; }
.learn-page .card strong { display: block; }
.price-line { display: flex; flex-wrap: wrap; gap: 8px; align-items: baseline; margin: 0; }
.price-line s { color: rgba(245,240,231,.62); }
.price-line b { font-size: 28px; letter-spacing: -.04em; }
.app-grid { display: grid; gap: 12px; }
.learn-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.learn-actions .btn { text-align: center; }
@media (min-width: 800px) {
  .media-pair { grid-template-columns: 0.9fr 1.1fr; gap: 28px; align-items: start; }
  .learn-split { grid-template-columns: 1.1fr .9fr; align-items: center; }
  .app-grid { grid-template-columns: repeat(3, 1fr); }
  .hist-art { grid-template-columns: 280px 1fr; align-items: center; }
}
@media (prefers-reduced-motion: reduce) {
  .learn-page * { scroll-behavior: auto; transition: none !important; }
}