/* /brain/learn/: "A moment to understand" explainers. Tokens, type, header, footer
   and buttons come from /styles.css; the page uses the .story measure from the service pages. */
.learn-intro .lead { max-width: 56ch; }
.learn-back { margin-top: 16px; font-size: 17px; }
.learn-back a { color: var(--brand-text); }

/* Video */
.learn-video { margin: clamp(32px, 5vw, 56px) 0 0; }
.learn-video video {
  display: block; width: 100%; height: auto; aspect-ratio: 16 / 9;
  border-radius: 12px; border: 1px solid var(--line); background: #110c0a;
  box-shadow: 0 30px 60px -30px var(--shadow);
}
.learn-video figcaption { margin-top: 12px; font-size: 16px; color: var(--ink-soft); }
.learn-video figcaption a { color: var(--brand-text); }

/* Short summary */
.learn-summary { margin: clamp(36px, 5vw, 56px) 0 0; padding: clamp(20px, 3vw, 28px); background: var(--brand-tint); border-radius: 12px; }
.learn-summary h2 { font-size: 21px; margin: 0 0 10px; }
.learn-summary ul { margin: 0; padding-left: 1.2em; }
.learn-summary li { margin-top: 8px; font-size: 18px; line-height: 1.5; }
.learn-summary li::marker { color: var(--brand-text); }

/* Sections */
.story > h2 { scroll-margin-top: 100px; }
.story > .learn-practices { list-style: none; margin: 18px 0 0; padding: 0; display: grid; gap: 12px; }
.learn-practices li { padding: 16px 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.learn-practices strong { display: block; font-size: 18px; }
.learn-practices span { display: block; margin-top: 4px; color: var(--ink-soft); font-size: 17px; }
.learn-practices a { color: var(--brand-text); }

/* Transcript */
.learn-transcript { margin-top: 20px; }
.learn-transcript p { margin-top: 12px; max-width: 65ch; font-size: 18px; line-height: 1.55; }
.learn-transcript .t-time { display: inline-block; min-width: 3.6em; margin-right: 6px; font-family: var(--font-mono); font-size: 14px; color: var(--ink-soft); letter-spacing: 0.04em; }

/* Sources */
.learn-sources { margin: 16px 0 0; padding-left: 1.2em; }
.learn-sources li { margin-top: 10px; max-width: 65ch; color: var(--ink-soft); font-size: 17px; line-height: 1.5; }
.learn-sources a { color: var(--brand-text); }

/* App card at the end of a subject page */
.learn-app { display: flex; align-items: center; gap: 18px; margin-top: 24px; padding: 20px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); color: var(--ink); text-decoration: none; }
.learn-app:hover { border-color: var(--brand-text); background: var(--brand-tint); color: var(--ink); }
.learn-app img { flex: none; width: 56px; height: 56px; border-radius: 13px; }
.learn-app strong { display: block; font-size: 19px; }
.learn-app span { display: block; margin-top: 3px; color: var(--ink-soft); font-size: 16px; }

/* Index of subjects */
.learn-list { list-style: none; margin: clamp(32px, 5vw, 48px) 0 0; padding: 0; display: grid; gap: 16px; }
.learn-item { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 20px; align-items: center; padding: 18px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); }
.learn-item img, .learn-item .learn-thumb { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-radius: 10px; border: 1px solid var(--line); background: var(--brand-tint); }
.learn-item .learn-thumb { display: grid; place-items: center; }
.learn-item .learn-thumb img { width: 44px; height: 44px; aspect-ratio: 1; border: 0; border-radius: 10px; }
.learn-item .eyebrow { margin-bottom: 6px; }
.learn-item h2 { font-size: clamp(22px, 2.4vw, 28px); line-height: 1.15; }
.learn-item h2 a { color: var(--ink); text-decoration: none; }
.learn-item h2 a:hover { color: var(--brand-text); }
.learn-item p { margin-top: 8px; color: var(--ink-soft); font-size: 17px; line-height: 1.5; max-width: 60ch; }
.learn-item .learn-meta { margin-top: 10px; font-size: 15px; color: var(--ink-soft); }
.learn-item.is-soon { background: transparent; }
.learn-item.is-soon h2 { color: var(--ink-soft); }
.learn-soon { display: inline-block; padding: 3px 10px; border-radius: 999px; background: var(--brand-tint); color: var(--brand-text); font-size: 14px; font-weight: 700; }
@media (max-width: 600px) {
  .learn-item { grid-template-columns: minmax(0, 1fr); gap: 14px; }
  .learn-item img, .learn-item .learn-thumb { max-width: 100%; }
  .learn-item.is-soon .learn-thumb { display: none; }
}