/* ============================================================================
   trainings.css — Individual Training course pages (.trn-* namespace)

   Sells ONE recorded training for ONE price. Modeled on a Coursera course
   page: information-dense and credibility-led, with a sticky tabbed section
   nav — NOT a linear long-form sales funnel.

   Loaded AFTER styles.css (for the design tokens) and BEFORE chrome.css (so
   the fixed site header always wins). Wired up via the $tla_styles mechanism
   in tla-fullhtml-template.php; convert-pages.sh detects the <link> tag
   automatically and emits it.

   Shared across every page in public/trainings/ — deliberately NOT an inline
   <style> block, because these pages are copy-and-filled per product and
   inlining would re-duplicate the whole suite with every new training.

   Brand carryovers only (per .claude/DESIGN.md fresh-page rules): Midnight
   Slate, brass, Manrope + Inter, the logo. Layout / card shapes / motion /
   FAQ treatment are all built fresh here.

   Contents
     1.  Page shell, section rhythm, typography
     2.  Buttons + price lockup
     3.  Hero (light)                    .trn-hero
     4.  Sticky tab nav                  .trn-nav      <- the new mechanism
     5.  About + skills pills            .trn-about / .trn-pill
     5b. Social proof (logos + pitch)    .trn-social
     6.  Curriculum chapter rows         .trn-curric
     7.  What's included + value stack   .trn-incl / .trn-stack
     8.  Instructors                     .trn-faculty / .trn-person
     9.  Faculty credibility + quote     .trn-proof / .trn-quote
     10. Testimonials (4-up, avatars)    .trn-testi
     11. Membership upsell               .trn-upsell
     12. FAQ                             .trn-faq
     13. Final CTA                       .trn-close
     14. Reduced motion
   ========================================================================== */


/* -- 1. Page shell, section rhythm, typography --------------------------- */

.trn {
  /* Slightly darker page ground so the white section cards read as raised.
     Modeled on the LinkedIn Learning course page. */
  background: #eceff1;
  /* Height of the sticky sub-nav. Feeds the anchor-offset calc below so every
     in-page link clears BOTH the fixed 72px header and this bar. No other
     page in the repo stacks two sticky bars, hence the explicit token. */
  --trn-nav-h: 56px;
}

/* Sections are white cards on the darker ground, evenly spaced. The wrap
   supplies the gutter; the card supplies the padding. Per DESIGN.md the
   fresh-page rules override the house light/dark section rhythm on a page
   built to an external reference. */
.trn-sec { padding-block: 0; }
.trn-sec + .trn-sec { margin-top: clamp(16px, 1.8vw, 24px); }
.trn-sec--tight { padding-block: 0; }

/* The white card itself. */
.trn-card {
  background: var(--surface-container-lowest);
  border: 1px solid rgba(2, 28, 54, 0.07);
  border-radius: var(--radius-lg);
  padding: clamp(24px, 3vw, 40px);
}
/* Accent card: subtle brass-tinted fill for the one block that should carry
   more weight than its neighbours. */
.trn-card--accent {
  background: linear-gradient(180deg, #fbf7ee 0%, #ffffff 62%);
  border-color: rgba(201, 150, 28, 0.28);
}

/* Body wrapper: clears the sticky nav above and the footer below. */
.trn-body { padding-block: clamp(20px, 2.4vw, 32px) clamp(32px, 4vw, 56px); }

/* Every scroll target clears header + sticky nav. Extends the existing
   `scroll-margin-top: calc(var(--header-h) + 24px)` convention from
   custom-sales-pages/acm.html. html{scroll-behavior:smooth} is already global. */
.trn-sec[id],
.trn-anchor {
  scroll-margin-top: calc(var(--header-h) + var(--trn-nav-h) + 24px);
}

/* NOTE: this page family no longer uses dark bands — every section is a
   white card on a light ground. Use .trn-card--accent for emphasis. */

.trn-wrap {
  max-width: 1080px;
  margin-inline: auto;
  padding-inline: 24px;
}
.trn-wrap--narrow { max-width: 780px; }
.trn-center { text-align: center; }

.trn-eyebrow {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brass);
  margin: 0;
}


.trn-h1 {
  font-family: var(--font-display);
  /* Compact per the reference — the hero is an information block, not a
     billboard. */
  font-size: clamp(1.75rem, 1.35rem + 1.7vw, 2.5rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.025em;
  margin: 8px 0 0;
  color: var(--primary);
}
.trn-h2 {
  font-family: var(--font-display);
  font-size: clamp(1.625rem, 1.25rem + 1.6vw, 2.25rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.022em;
  margin: 10px 0 0;
  color: var(--primary);
}


.trn-h3 {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.3;
  margin: 0;
  color: var(--primary);
}


/* Brass-gradient emphasis inside a heading. */
.trn-gold {
  background: linear-gradient(135deg, #c9961c 0%, #eac25a 50%, #ffd56c 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.trn-lead {
  font-family: var(--font-body);
  font-size: clamp(1.0625rem, 1rem + 0.35vw, 1.1875rem);
  line-height: 1.6;
  color: var(--on-surface-variant);
  margin: 14px 0 0;
}


.trn-prose {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.68;
  color: var(--on-surface-variant);
  margin: 14px 0 0;
  max-width: 68ch;
}



/* -- 2. Buttons + price lockup ------------------------------------------- */

.trn-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: none;
  padding: 15px 30px;
  border: 0;
  border-radius: var(--radius-full);
  cursor: pointer;
  background: linear-gradient(135deg, #c9961c 0%, #eac25a 50%, #ffd56c 100%);
  color: #021c36;
  box-shadow: 0 8px 22px -6px rgba(201, 150, 28, 0.5);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}
.trn-btn:hover {
  background: linear-gradient(135deg, #b3841a 0%, #d6ae47 50%, #f6c95c 100%);
  transform: translateY(-2px);
  box-shadow: 0 14px 30px -8px rgba(201, 150, 28, 0.58);
}
.trn-btn:focus-visible {
  outline: 3px solid var(--brass);
  outline-offset: 3px;
}
.trn-btn--block { width: 100%; }
.trn-btn--sm { font-size: 0.875rem; padding: 10px 20px; }

/* Quiet secondary link — the membership cross-sell must never compete with
   the buy button. */
.trn-link {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--on-surface-variant);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color 0.15s ease;
}
.trn-link:hover { color: var(--primary); }



.trn-price {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}
.trn-price__now {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 1.8rem + 2vw, 3rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--primary);
}
.trn-price__note {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--on-surface-variant);
}


/* Struck compare-at price. The rule is drawn as a pseudo-element rather than
   line-through so its weight and angle stay consistent across browsers. */
.trn-price__was {
  position: relative;
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1;
  color: var(--outline);
}
.trn-price__was::after {
  content: '';
  position: absolute;
  left: -3px;
  right: -3px;
  top: 48%;
  height: 2px;
  background: currentColor;
  transform: rotate(-9deg);
}



/* -- 3. Hero (light, Coursera-style) ------------------------------------- */

.trn-hero {
  position: relative;
  overflow: hidden;
  /* White hero, sitting above the darker body ground. */
  background: var(--surface-container-lowest);
  padding-block: clamp(28px, 3.4vw, 44px) clamp(30px, 3.6vw, 46px);
}
/* Faint brass watermark arc bleeding off the right edge. Decorative only. */
.trn-hero::after {
  content: '';
  position: absolute;
  top: -180px;
  right: -220px;
  width: 720px;
  height: 720px;
  border-radius: 50%;
  border: 84px solid rgba(201, 150, 28, 0.045);
  pointer-events: none;
}
@media (max-width: 899px) {
  .trn-hero::after {
    width: 440px;
    height: 440px;
    border-width: 52px;
    right: -210px;
    top: -140px;
  }
}

/* Two-column: copy left, square key art right. Collapses to one column and
   drops the art below the copy under 900px. */
.trn-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: center;
}
@media (min-width: 900px) {
  /* The 16:9 preview is far shorter than a square, so let it take more width
     or the media column reads as under-filled next to the headline. */
  .trn-hero__grid { grid-template-columns: 1fr 1.05fr; }
}
.trn-hero__in {
  position: relative;
  z-index: 1;
  max-width: 640px;
}

/* Course-preview player. 16:9 frame holding a poster image plus a play
   affordance; swap the inner <img> for the real embed when there is one (see
   the commented Wistia block in the template). */
.trn-hero__video {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  border: 1px solid rgba(2, 28, 54, 0.1);
  box-shadow: 0 20px 48px -14px rgba(2, 28, 54, 0.3);
  background: var(--primary);
}
.trn-hero__video img,
.trn-hero__video iframe,
.trn-hero__video wistia-player {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  object-fit: cover;
}

/* Play overlay. A <button> so it is focusable and announced; it becomes the
   real play trigger once an embed is wired in. */
.trn-hero__play {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  width: 100%;
  padding: 0;
  border: 0;
  cursor: pointer;
  background: linear-gradient(180deg, rgba(2, 28, 54, 0.08) 0%, rgba(2, 28, 54, 0.42) 100%);
  transition: background 0.2s ease;
}
.trn-hero__play:hover { background: linear-gradient(180deg, rgba(2, 28, 54, 0.16) 0%, rgba(2, 28, 54, 0.5) 100%); }
.trn-hero__play:focus-visible {
  outline: 3px solid var(--brass-bright);
  outline-offset: -4px;
}
.trn-hero__play span {
  width: 66px;
  height: 66px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #c9961c 0%, #eac25a 50%, #ffd56c 100%);
  box-shadow: 0 10px 30px rgba(201, 150, 28, 0.45);
  transition: transform 0.2s ease;
}
.trn-hero__play:hover span { transform: scale(1.06); }
.trn-hero__play svg {
  width: 24px;
  height: 24px;
  color: var(--primary);
  /* Nudge the triangle so it reads as optically centred in the circle. */
  margin-left: 3px;
}

/* "Preview" pill. Top-RIGHT: the 16:9 poster art has a red REPLAY badge baked
   into its top-left corner, which this would otherwise sit on top of. */
.trn-hero__vlabel {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 1;
  padding: 5px 11px;
  border-radius: var(--radius-full);
  background: rgba(2, 28, 54, 0.82);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--brass-bright);
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .trn-hero__play,
  .trn-hero__play span { transition: none; }
  .trn-hero__play:hover span { transform: none; }
}
/* Hero eyebrow — replaces the brand logo that used to sit above the H1. */
.trn-hero__eyebrow {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brass);
  margin: 0;
}
.trn-hero__sub {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--on-surface-variant);
  margin: 14px 0 0;
  max-width: 62ch;
}

/* Compact fact row under the H1. */
.trn-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  margin: 12px 0 0;
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--on-surface-variant);
}
.trn-meta span { white-space: nowrap; }
.trn-meta span:not(:last-child)::after {
  content: '·';
  margin-left: 10px;
  color: var(--outline);
}
/* Narrow screens: the facts stack, so a trailing dot would dangle. */
@media (max-width: 559px) {
  .trn-meta span:not(:last-child)::after { content: none; }
  .trn-meta { gap: 4px 12px; }
}

/* Stacked instructor avatars + count. */
.trn-avatars {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 14px 0 0;
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--on-surface-variant);
}
.trn-avatars__stack { display: flex; }
.trn-avatars__stack img {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  object-fit: cover;
  object-position: top center;
  border: 2px solid #fff;
  background: var(--surface-container);
}
.trn-avatars__stack img + img { margin-left: -10px; }

/* Caption under the hero media, as in the reference. */
.trn-hero__cap {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  color: var(--on-surface-variant);
  margin: 10px 0 0;
  text-align: center;
}
.trn-hero__cap strong { color: var(--on-surface); font-weight: 600; }

/* Small label above the price/CTA row, naming what the purchase delivers. */
.trn-hero__gets {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: -0.005em;
  color: var(--primary);
  margin: clamp(24px, 3vw, 32px) 0 0;
}
/* The label owns the top gap, so the row below it sits tight. */
.trn-hero__gets + .trn-hero__buy { margin-top: 10px; }

/* Price sits to the LEFT of the button. */
.trn-hero__buy {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
  margin-top: clamp(24px, 3vw, 32px);
}
/* "Included with [logo] · Learn more" — an inline brand lockup rather than a
   text label, so the membership reads as a named product. */
.trn-hero__incl {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--on-surface-variant);
  margin: 18px 0 0;
}
/* Brand lockup: logomark + live text. The full wordmark asset carries a
   tagline that turns to mush below ~28px, and 28px is too tall to sit inline
   in a 15px line — so the mark is the image and the name is real type, which
   stays crisp at any size and is selectable/readable by assistive tech. */
.trn-hero__incl-lockup {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.trn-hero__incl-logo {
  height: 20px;
  width: auto;
  display: block;
}
.trn-hero__incl-name {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.trn-hero__incl-sep {
  color: var(--outline-variant);
  user-select: none;
}


/* -- 4. Sticky tab nav (the new mechanism) ------------------------------- */

/* Sits directly beneath the fixed 72px site header (z-index 50 in chrome.css).
   z-index 40 is the settled band for "sticky under the header" — the same
   value the .mm-bar pattern uses on the custom sales pages. */
.trn-nav {
  position: sticky;
  top: var(--header-h);
  z-index: 40;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--outline-variant);
}
.trn-nav__in {
  max-width: 1080px;
  margin-inline: auto;
  padding-inline: 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}

/* Collapsed state: title + Enroll button fade in once the hero is passed.
   Opacity/transform only — never display — so the tab rail never reflows. */
/* The title occupies its slot from the start (only its opacity animates), so
   the tab rail keeps the same left-aligned position whether the bar is
   collapsed or not — it must not drift to centre when the title is invisible. */
.trn-nav__title {
  display: none;
  min-width: 0;
  max-width: 30%;
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--primary);
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  opacity: 0;
  transition: opacity 0.25s ease;
}
.trn-nav__cta {
  margin-left: auto;
  flex-shrink: 0;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-4px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.trn-nav.is-stuck .trn-nav__cta {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}
@media (min-width: 900px) {
  .trn-nav__title { display: block; }
  .trn-nav.is-stuck .trn-nav__title { opacity: 1; }
}

/* Tab rail. Horizontal overflow-scroll on narrow screens using the
   negative-gutter bleed technique from .wi2-tabs__rail. */
.trn-nav__rail {
  display: flex;
  align-items: stretch;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
  min-width: 0;
  /* Claim the free space so the tabs stay left-aligned; without this the
     CTA's margin-left:auto would centre the rail while the title is hidden. */
  flex: 1 1 auto;
}
@media (max-width: 899px) {
  .trn-nav__in { gap: 12px; }
  .trn-nav__rail {
    flex-wrap: nowrap;
    overflow-x: auto;
    margin-inline: -24px;
    padding-inline: 24px;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .trn-nav__rail::-webkit-scrollbar { display: none; }
}

.trn-nav__tab {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  padding: 17px 14px;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--on-surface-variant);
  text-decoration: none;
  border-bottom: 3px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.trn-nav__tab:hover { color: var(--primary); }
.trn-nav__tab:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: -3px;
  border-radius: var(--radius);
}
/* Active tab — brass underline, matching the reference's underline treatment. */
.trn-nav__tab.is-active {
  color: var(--primary);
  border-bottom-color: var(--brass);
}


/* -- 5. About + skills pills -------------------------------------------- */

.trn-about__grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}
@media (min-width: 900px) {
  .trn-about__grid { grid-template-columns: 1.35fr 1fr; }
}

.trn-sub {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--primary);
  margin: 0 0 12px;
}
.trn-about__block + .trn-about__block { margin-top: clamp(26px, 3vw, 38px); }

/* "By the end you'll be able to" outcome list. Brass check + text, two-column
   on wide screens. Sized explicitly — an unsized inline <svg> renders at its
   default box, not the 22px this needs. */
.trn-learn__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.trn-learn__list li {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 12px;
  align-items: start;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.55;
  color: var(--on-surface-variant);
}
.trn-learn__list svg {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  margin-top: 2px;
}

/* Skills pills — values ported from the .oh-chip component on the
   office-hours pages, which is already the neutral grey wrapping pill this
   needs. It lives page-local there, so it is copied rather than shared. */
.trn-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.trn-pill {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 9px 16px;
  border-radius: var(--radius-full);
  background: var(--surface-container-low);
  color: var(--on-surface);
  border: 1px solid var(--outline-variant);
}

/* "Details to know" — small icon + label + sub rows */
.trn-details {
  display: flex;
  flex-wrap: wrap;
  gap: 26px 44px;
  margin-top: 18px;
}
.trn-detail { max-width: 240px; }
.trn-detail svg {
  width: 22px;
  height: 22px;
  color: var(--brass);
  display: block;
  margin-bottom: 10px;
}
.trn-detail__t {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--primary);
  margin: 0;
}
.trn-detail__s {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  line-height: 1.45;
  color: var(--on-surface-variant);
  margin: 4px 0 0;
}


/* -- 5b. Social-proof card (membership pitch + employer logos) ---------- */

/* Bespoke to this page family — deliberately NOT the site-wide .trust
   marquee. A bordered card: pitch copy + CTA link on the left, a static
   logo grid on the right. Static (no animation) so the logos read as
   evidence rather than decoration. */
/* Sits inside a .trn-card, so it draws no chrome of its own — a bordered box
   inside a bordered card reads as a double frame. */
.trn-social {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 2.6vw, 36px);
  align-items: center;
}
@media (min-width: 820px) {
  .trn-social { grid-template-columns: 1.15fr 1fr; }
}
.trn-social__title {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 1.05rem + 0.7vw, 1.5rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.018em;
  color: var(--primary);
  margin: 0;
  max-width: 26ch;
}
/* Inline (not inline-flex) so a wrapped label keeps the arrow tucked against
   the last word instead of stranding it at the far right of the column. */
.trn-social__cta {
  display: inline;
  margin-top: 16px;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--brass);
  text-decoration: none;
  transition: color 0.15s ease;
}
.trn-social__cta-wrap { margin: 16px 0 0; }
/* Keeps the final word and the chevron together on one line. */
.trn-nowrap { white-space: nowrap; }
.trn-social__cta:hover { color: var(--primary); }
.trn-social__cta svg {
  /* inline-block, not the default inline: as a bare inline replaced element
     the chevron gets pushed to its own line even inside a nowrap span. */
  display: inline-block;
  width: 15px;
  height: 15px;
  vertical-align: -2px;
  margin-left: 5px;
  transition: transform 0.15s ease;
}
.trn-social__cta:hover svg { transform: translateX(3px); }

/* Logo grid. Each cell caps BOTH height and width, because these logos run
   from 2.1:1 to 6.5:1 — height alone would let the wide ones dominate. */
.trn-social__logos {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(18px, 2.4vw, 30px) clamp(14px, 2vw, 26px);
  align-items: center;
  justify-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
}
.trn-social__logos li {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}
.trn-social__logos img {
  display: block;
  max-height: 28px;
  max-width: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  /* Desaturate so the wall of brand colors doesn't fight the page. */
  filter: grayscale(100%);
  opacity: 0.72;
  transition: filter 0.2s ease, opacity 0.2s ease;
}
.trn-social:hover .trn-social__logos img {
  filter: grayscale(0%);
  opacity: 1;
}
@media (max-width: 479px) {
  .trn-social__logos { grid-template-columns: repeat(2, 1fr); }
  .trn-social__logos img { max-height: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  .trn-social__cta,
  .trn-social__cta svg,
  .trn-social__logos img { transition: none; }
  .trn-social__cta:hover svg { transform: none; }
}


/* -- 6. Curriculum chapter rows ----------------------------------------- */

.trn-curric__list {
  margin-top: clamp(24px, 3vw, 34px);
  background: var(--surface-container-lowest);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-2xl);
  overflow: hidden;
}
/* Native <details> — zero JavaScript. */
.trn-chapter + .trn-chapter { border-top: 1px solid var(--outline-variant); }
.trn-chapter > summary {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px clamp(18px, 2.4vw, 28px);
  cursor: pointer;
  list-style: none;
}
.trn-chapter > summary::-webkit-details-marker { display: none; }
.trn-chapter > summary:hover { background: var(--surface-container-low); }
.trn-chapter > summary:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: -2px;
}
.trn-chapter__n {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--surface-container);
  color: var(--on-surface-variant);
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 700;
}
.trn-chapter[open] .trn-chapter__n {
  background: linear-gradient(135deg, #c9961c 0%, #eac25a 50%, #ffd56c 100%);
  color: #021c36;
}
.trn-chapter__t {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--primary);
  margin: 0;
}
.trn-chapter > summary::after {
  content: '';
  flex-shrink: 0;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--on-surface-variant);
  border-bottom: 2px solid var(--on-surface-variant);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}
.trn-chapter[open] > summary::after { transform: rotate(-135deg); }
.trn-chapter__body {
  padding: 0 clamp(18px, 2.4vw, 28px) 20px calc(clamp(18px, 2.4vw, 28px) + 46px);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--on-surface-variant);
  margin: 0;
  max-width: 74ch;
}
@media (max-width: 599px) {
  .trn-chapter__body { padding-left: clamp(18px, 2.4vw, 28px); }
}


/* -- 7. What's included + value stack (dark) ---------------------------- */

.trn-incl__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
  margin-top: clamp(24px, 3vw, 34px);
}
@media (min-width: 900px) {
  .trn-incl__grid { grid-template-columns: 1fr 1fr; }
}

/* Included-items list. Was glass-on-dark; now a plain light list since every
   section is a white card. */
.trn-stack {
  margin-top: 4px;
}
.trn-stack__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-block: 15px;
  border-bottom: 1px solid var(--outline-variant);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--on-surface-variant);
}
.trn-stack__row strong { color: var(--on-surface); font-weight: 700; }
.trn-stack__row:first-child { padding-top: 0; }
.trn-stack__val {
  flex-shrink: 0;
  font-weight: 700;
  color: var(--brass);
  font-variant-numeric: tabular-nums;
}
.trn-stack__total {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-top: 16px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
}
.trn-stack__total .trn-stack__val {
  position: relative;
  font-size: 1.0625rem;
  color: var(--outline);
}
.trn-stack__total .trn-stack__val::after {
  content: '';
  position: absolute;
  left: -3px;
  right: -3px;
  top: 50%;
  height: 2px;
  background: currentColor;
  transform: rotate(-7deg);
}
.trn-stack__pay {
  margin: 18px 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(201, 150, 28, 0.35);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  color: var(--primary);
}
.trn-stack__pay strong {
  font-size: 1.75rem;
  line-height: 1;
  color: var(--primary);
}

/* Brass check list (used in the includes column) */
.trn-checks {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 13px;
}
.trn-checks li {
  display: grid;
  grid-template-columns: 20px 1fr;
  gap: 12px;
  align-items: start;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.55;
  color: var(--on-surface-variant);
}
.trn-checks svg { width: 20px; height: 20px; margin-top: 2px; flex-shrink: 0; }


/* -- 8. Instructors ----------------------------------------------------- */

.trn-faculty__grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 3vw, 34px);
  grid-template-columns: repeat(2, 1fr);
}
@media (min-width: 860px) {
  .trn-faculty__grid { grid-template-columns: repeat(4, 1fr); }
}
.trn-person {
  text-align: center;
  background: var(--surface-container-lowest);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-xl);
  padding: 22px 16px 18px;
}
.trn-person__photo {
  width: 84px;
  height: 84px;
  margin: 0 auto 12px;
  border-radius: 50%;
  padding: 3px;
  background: linear-gradient(135deg, #c9961c 0%, #eac25a 50%, #ffd56c 100%);
}
.trn-person__photo > span {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  overflow: hidden;
  background: var(--primary);
}
.trn-person__photo img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
}
.trn-person__name {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--primary);
  margin: 0;
}
.trn-person__role {
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brass);
  margin: 6px 0 0;
}
.trn-person__org {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  line-height: 1.4;
  color: var(--on-surface-variant);
  margin: 3px 0 0;
}
/* Short bio under the org line. Left-aligned even though the card is centred —
   a centred paragraph of this length is hard to read. */
.trn-person__bio {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  line-height: 1.55;
  color: var(--on-surface-variant);
  text-align: left;
  margin: 14px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--outline-variant);
}


/* -- 9. Faculty credibility + pull-quote (dark) ------------------------ */

.trn-proof__stats {
  display: grid;
  gap: 20px;
  margin-top: clamp(24px, 3vw, 34px);
  grid-template-columns: repeat(2, 1fr);
}
@media (min-width: 780px) {
  .trn-proof__stats { grid-template-columns: repeat(4, 1fr); }
}
.trn-pstat { text-align: center; }
.trn-pstat__num {
  font-family: var(--font-display);
  font-size: clamp(1.875rem, 1.5rem + 1.3vw, 2.5rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  color: var(--brass);
  margin: 0;
}
.trn-pstat__label {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  line-height: 1.45;
  color: var(--on-surface-variant);
  margin: 9px 0 0;
}

.trn-quote {
  max-width: 760px;
  margin: clamp(26px, 3.2vw, 40px) auto 0;
  padding: 22px 26px;
  background: var(--surface-container-low);
  border-left: 3px solid var(--brass);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  text-align: left;
}
.trn-quote blockquote {
  font-family: var(--font-display);
  font-size: clamp(1.0625rem, 1rem + 0.5vw, 1.25rem);
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: -0.012em;
  color: var(--primary);
  margin: 0;
}
.trn-quote figcaption {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--brass);
  margin: 14px 0 0;
}


/* -- 10. Testimonials — 4-up compact cards with inline avatars ---------- */

.trn-testi__grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 3vw, 34px);
  grid-template-columns: 1fr;
}
@media (min-width: 620px) {
  .trn-testi__grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1000px) {
  .trn-testi__grid { grid-template-columns: repeat(4, 1fr); }
}
.trn-tcard {
  background: var(--surface-container-lowest);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg);
  padding: 20px;
}
.trn-tcard__head {
  display: flex;
  align-items: center;
  gap: 12px;
}
.trn-tcard__photo {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  /* Doubles as the ground behind transparent cutout headshots AND as the
     initials chip when no photo exists. */
  background: var(--surface-container);
  color: var(--on-surface-variant);
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 700;
}
.trn-tcard__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
}
.trn-tcard__name {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--primary);
  margin: 0;
}
.trn-tcard__org {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  line-height: 1.35;
  color: var(--on-surface-variant);
  margin: 2px 0 0;
}
.trn-tcard__quote {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--on-surface-variant);
  margin: 14px 0 0;
}


/* -- 11. Membership upsell — one wide card ----------------------------- */

.trn-upsell {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  background: linear-gradient(160deg, #060e1c 0%, #021c36 55%, #071e39 100%);
  box-shadow: 0 18px 44px -16px rgba(2, 28, 54, 0.45);
}
/* Brass top edge, drawn as a pseudo-element (border-image paints unevenly
   against a single rounded edge). */
.trn-upsell::before {
  content: '';
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 4px;
  background: linear-gradient(135deg, #c9961c 0%, #eac25a 50%, #ffd56c 100%);
  z-index: 2;
}
@media (min-width: 820px) {
  .trn-upsell { grid-template-columns: 1.25fr 0.75fr; }
}
.trn-upsell__body {
  padding: clamp(26px, 3.4vw, 44px);
  position: relative;
  z-index: 1;
}
.trn-upsell__title {
  font-family: var(--font-display);
  font-size: clamp(1.375rem, 1.1rem + 1vw, 1.75rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: #fff;
  margin: 10px 0 0;
}
.trn-upsell__text {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.76);
  margin: 12px 0 0;
  max-width: 46ch;
}
.trn-upsell__actions {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-top: 22px;
}
.trn-upsell__media {
  position: relative;
  min-height: 180px;
}
.trn-upsell__media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: left center;
}
/* Fade the image into the navy so there is no hard seam. */
.trn-upsell__media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, #021c36 0%, rgba(2, 28, 54, 0.55) 38%, rgba(2, 28, 54, 0) 100%);
}
@media (max-width: 819px) {
  .trn-upsell__media { min-height: 150px; order: -1; }
  .trn-upsell__media::after {
    background: linear-gradient(180deg, rgba(2, 28, 54, 0) 25%, rgba(2, 28, 54, 0.85) 78%, #021c36 100%);
  }
}


/* -- 12. FAQ ----------------------------------------------------------- */

/* Flat divider rows (the reference uses hairlines, not boxed cards).
   Native <details>/<summary> — zero JavaScript. */
.trn-faq__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}
@media (min-width: 900px) {
  .trn-faq__grid { grid-template-columns: 1.6fr 1fr; }
}
.trn-faq__list { margin-top: 6px; }
.trn-faq__item { border-bottom: 1px solid var(--outline-variant); }
.trn-faq__item:first-child { border-top: 1px solid var(--outline-variant); }
.trn-faq__item summary {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--primary);
  transition: color 0.15s ease;
}
.trn-faq__item summary::-webkit-details-marker { display: none; }
.trn-faq__item summary:hover { color: var(--brass); }
.trn-faq__item summary:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 2px;
  border-radius: var(--radius);
}
/* Chevron leads on the left, as in the reference. */
.trn-faq__item summary::before {
  content: '';
  flex-shrink: 0;
  width: 9px;
  height: 9px;
  margin-top: 6px;
  border-right: 2px solid var(--brass);
  border-bottom: 2px solid var(--brass);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}
.trn-faq__item[open] summary::before { transform: rotate(-135deg); }
.trn-faq__item[open] summary { color: var(--brass); }
.trn-faq__body {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--on-surface-variant);
  padding: 0 0 20px 25px;
  margin: 0;
  max-width: 68ch;
}

/* "More questions" aside */
.trn-aside {
  background: var(--surface-container-lowest);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-xl);
  padding: 24px;
}
.trn-aside svg { width: 22px; height: 22px; color: var(--brass); display: block; }
.trn-aside__t {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--primary);
  margin: 12px 0 0;
}
.trn-aside__hr {
  border: 0;
  border-top: 1px solid var(--outline-variant);
  margin: 18px 0;
}
.trn-aside p {
  font-family: var(--font-body);
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--on-surface-variant);
  margin: 8px 0 0;
}


/* -- 13. Final CTA ----------------------------------------------------- */

.trn-close { text-align: center; }
.trn-close .trn-price { justify-content: center; margin-top: 18px; }
.trn-close .trn-btn { margin-top: 22px; }
.trn-close__fine {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  color: var(--on-surface-variant);
  margin: 16px 0 0;
}


/* -- 14. Reduced motion ------------------------------------------------ */

/* DESIGN.md: every new motion needs a reduced-motion fallback. The sticky nav
   stays fully functional — only its transitions are removed. */
@media (prefers-reduced-motion: reduce) {
  .trn-nav__title,
  .trn-nav__cta,
  .trn-nav__tab,
  .trn-btn,
  .trn-link,
  .trn-chapter > summary::after,
  .trn-faq__item summary,
  .trn-faq__item summary::before {
    transition: none;
  }
  .trn-btn:hover { transform: none; }
  .trn-nav__cta { transform: none; }
}