/* Sample walkthrough inherits the site's court-green and lime palette. */
.sample-intro, .sample-watch, .sample-read, .sample-explain {
  width: min(1120px, calc(100% - 2rem));
  margin-inline: auto;
}
.sample-intro { padding: clamp(3rem, 7vw, 6rem) 0 2.5rem; }
.sample-intro__layout { display: grid; grid-template-columns: 1.1fr 1fr; gap: 3rem; align-items: end; }
.sample-intro h1 { margin: 0; font-size: clamp(3rem, 6.5vw, 5.5rem); line-height: 1.02; letter-spacing: -.035em; text-wrap: balance; }
.sample-intro__layout p { max-width: 48ch; margin: 0; color: #c5d0c9; font-size: 1.1rem; line-height: 1.65; }
.sample-intro__layout .sample-clip-meta { margin-top: 1.25rem; color: var(--mint); font-size: .85rem; }
.sample-watch { padding-bottom: 4rem; }
.sample-watch__heading { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; padding: 1.1rem 0; border-top: 1px solid var(--line); }
.sample-watch__heading h2 { margin: 0; font-size: 1.15rem; font-weight: 600; }
.sample-watch__heading > span { color: var(--muted); font-size: .85rem; }
.sample-player { margin: 0; }
.sample-player video { display: block; width: 100%; aspect-ratio: 16 / 9; background: var(--panel); }
.sample-player figcaption { margin: 1rem 0 1.25rem; max-width: 75ch; color: var(--muted); font-size: .9rem; line-height: 1.6; }
.sample-chapters { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.sample-chapters button { display: flex; align-items: center; gap: .85rem; min-height: 58px; padding: 1rem; background: var(--panel); border: 0; color: var(--text); font: inherit; font-size: .95rem; cursor: pointer; text-align: left; }
.sample-chapters button > span { color: var(--lime); font-size: .8rem; font-variant-numeric: tabular-nums; }
.sample-chapters svg { margin-left: auto; fill: none; stroke: currentColor; stroke-width: 1.5; }
.sample-chapters button:hover { background: var(--panel-2); color: var(--lime); }
.sample-page button:focus-visible, .sample-page video:focus-visible, .sample-preview:focus-visible { outline: 2px solid var(--lime); outline-offset: -4px; }
.sample-playback-status { margin: .5rem 0 0; color: var(--mint); font-size: .85rem; }
.sample-playback-status:empty { display: none; }
.sample-video-link { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .75rem; margin: 1rem 0 0; font-size: .85rem; }
.sample-video-link a, .sample-explain a { color: var(--mint); text-underline-offset: .25em; }
.sample-video-link span { color: var(--muted); }
.sample-read { padding: 2rem 0 4rem; border-top: 1px solid var(--line); }
.sample-read__intro { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; margin: 1rem 0 2.5rem; }
.sample-read h2, .sample-explain h2 { margin: 0; font-size: clamp(2rem, 3.6vw, 3rem); line-height: 1.1; letter-spacing: -.03em; text-wrap: balance; }
.sample-read__intro p { margin: 0; color: var(--muted); line-height: 1.65; }
.sample-finding { display: grid; grid-template-columns: .65fr 1fr 1fr; gap: 2.5rem; padding: 2rem 0; border-top: 1px solid var(--line); }
.sample-finding h3 { margin: 0 0 .5rem; font-size: 1.35rem; letter-spacing: -.02em; }
.sample-finding h4 { margin: 0 0 .65rem; font-size: 1rem; line-height: 1.5; font-weight: 600; }
.sample-finding p { margin: 0; font-size: .95rem; color: var(--muted); line-height: 1.65; }
.sample-practice h4 { color: var(--mint); }
.sample-text-button { min-height: 44px; padding: .35rem 0; border: 0; background: transparent; color: var(--lime); font: inherit; font-size: .85rem; cursor: pointer; text-decoration: underline; text-underline-offset: .3em; }
.sample-text-button:hover { color: var(--text); }
.sample-explain { display: grid; grid-template-columns: .9fr 1.1fr; gap: 5rem; padding: 3rem 0; border-top: 1px solid var(--line); }
.sample-explain p { max-width: 65ch; color: var(--muted); line-height: 1.65; }
.sample-explain h3 { margin: 0 0 .5rem; font-size: 1.15rem; }
.sample-explain__details > p { margin: 0 0 2rem; }
.sample-explain details { border-top: 1px solid var(--line); padding-top: 1rem; }
.sample-explain summary { min-height: 44px; cursor: pointer; color: var(--mint); }
.sample-explain summary:focus-visible { outline: 2px solid var(--lime); outline-offset: 4px; }
.sample-page .cta-section h2 { max-width: 20ch; font-size: clamp(2rem, 4vw, 3.5rem); letter-spacing: -.03em; line-height: 1.1; }
.sample-preview { position: relative; display: block; align-self: center; color: var(--text); text-decoration: none; overflow: hidden; border-radius: 12px; }
.sample-preview img { display: block; width: 100%; height: auto; }
.sample-preview__play { display: flex; align-items: center; justify-content: center; gap: .75rem; min-height: 58px; background: var(--lime); color: var(--ink); font-weight: 600; }
.sample-preview__play svg { fill: currentColor; }
.sample-preview:hover .sample-preview__play { background: var(--mint); }
@media (max-width: 760px) {
  .sample-intro__layout, .sample-read__intro, .sample-explain { grid-template-columns: 1fr; gap: 1.5rem; }
  .sample-intro { padding-top: 3rem; }
  .sample-watch__heading { align-items: flex-start; flex-direction: column; gap: .3rem; }
  .sample-chapters { grid-template-columns: 1fr; }
  .sample-chapters button { min-height: 52px; }
  .sample-finding { grid-template-columns: 1fr 1fr; gap: 1rem 1.5rem; }
  .sample-finding__heading { grid-column: 1 / -1; display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; }
  .sample-explain { padding-top: 2rem; }
}
@media (max-width: 460px) {
  .sample-finding { grid-template-columns: 1fr; gap: 1.25rem; }
  .sample-finding__heading { flex-wrap: wrap; gap: .25rem; }
}
@media (forced-colors: active) {
  .sample-chapters button { border: 1px solid ButtonText; }
  .sample-page button:focus-visible, .sample-page video:focus-visible, .sample-preview:focus-visible { outline-color: Highlight; }
}

/* Apple design refinement, 2026-10-11 */

/* Video and observations are the sample page's primary visual hierarchy. */
.sample-intro, .sample-watch, .sample-read, .sample-explain { width: min(1120px, calc(100% - 3rem)); }
.sample-intro { padding-block: clamp(3rem, 6vw, 5rem) 3rem; }
.sample-intro h1 { font-size: clamp(2.5rem, 4.8vw, 4.5rem); line-height: 1.08; letter-spacing: -.045em; }
.sample-intro__layout { gap: clamp(2rem, 5vw, 4rem); }
.sample-player video { border: 1px solid #ffffff24; border-radius: 1.25rem; }
.sample-player figcaption { font-size: .9375rem; }
.sample-chapters { border-radius: 1rem; }
.sample-chapters button { min-height: 64px; background: var(--panel); transition: background-color 160ms ease; }
.sample-chapters button:active { background: var(--panel-2); }
.sample-finding { gap: 2rem; padding-block: 2.5rem; }
.sample-finding h3 { font-weight: 600; }
.sample-finding p { font-size: 1rem; }
.sample-practice { padding: 1.25rem; border-radius: 1rem; background: var(--panel); }
.sample-text-button { font-size: .9375rem; }
.sample-explain { gap: 3rem; }
.sample-explain summary { font-size: 1rem; }
.sample-preview { border: 1px solid #ffffff24; border-radius: 1.25rem; }
.sample-preview__play { min-height: 64px; font-size: .9375rem; }
@media (max-width: 760px) {
  .sample-intro, .sample-watch, .sample-read, .sample-explain { width: calc(100% - 2.5rem); }
  .sample-intro__layout, .sample-explain { gap: 1.5rem; }
  .sample-finding { gap: 1.5rem; }
  .sample-finding__heading { align-items: center; }
  .sample-chapters button { min-height: 56px; }
  .sample-practice { padding: 1rem; }
}