/* ==========================================================================
   /trust-layer page — long-form essay with sticky TOC + scroll-driven 11-layer stack visual.
   ========================================================================== */

.article-tl__header {
  background: var(--surface-inverse);
  color: var(--ink-on-inverse);
  padding-block: clamp(var(--s-7), 12vw, var(--s-10)) var(--s-7);
  position: relative;
  overflow: hidden;
}
.article-tl__header::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, transparent 0 39px, rgba(255,255,255,0.025) 39px 40px),
    repeating-linear-gradient(90deg, transparent 0 39px, rgba(255,255,255,0.025) 39px 40px);
  pointer-events: none;
}
.article-tl__header .eyebrow { color: var(--ink-on-inverse-muted); }
.article-tl__h1 {
  font-size: clamp(2.5rem, 7vw, 5rem);
  line-height: 1.0;
  letter-spacing: -0.04em;
  font-weight: var(--weight-bold);
  margin: var(--s-3) 0 var(--s-3);
  color: var(--ink-on-inverse);
  text-wrap: balance;
}
.article-tl__sub {
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 2.4vw, 1.625rem);
  font-style: italic;
  font-weight: var(--weight-regular);
  color: var(--ink-on-inverse-soft);
  margin: 0 0 var(--s-5);
  max-width: 50ch;
}
.article-tl__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-3);
  font-size: var(--fs-micro);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-on-inverse-muted);
  align-items: center;
}
.article-tl__meta [data-review-flag] {
  padding: 0.25rem 0.5rem;
  border: 1px dashed var(--ink-on-inverse-faint);
  color: var(--ink-on-inverse-soft);
}

/* ----- Body grid ----- */
.article-tl__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-7);
  padding-block: var(--s-8);
}
@media (min-width: 1024px) {
  .article-tl__body {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: var(--s-7);
  }
}
@media (min-width: 1280px) {
  .article-tl__body {
    grid-template-columns: 260px minmax(0, 1fr);
  }
}

.article-tl__toc {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}
@media (min-width: 1024px) {
  .article-tl__toc {
    position: sticky;
    top: calc(var(--header-h) + var(--s-4));
    align-self: start;
    max-height: calc(100vh - var(--header-h) - var(--s-6));
    overflow-y: auto;
    padding-right: var(--s-3);
  }
}
.article-tl__toc-label {
  margin-bottom: var(--s-2);
}
.article-tl__toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: toc;
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
}
.article-tl__toc-list li {
  counter-increment: toc;
  position: relative;
  padding-left: 2rem;
  line-height: 1.4;
}
.article-tl__toc-list li::before {
  content: counter(toc, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-size: var(--fs-micro);
  color: var(--ink-faint);
  letter-spacing: 0.1em;
}
.article-tl__toc-list a {
  text-decoration: none;
  color: var(--ink-secondary);
  transition: color var(--t-fast) var(--ease-out);
}
.article-tl__toc-list a:hover { color: var(--ink-primary); }
.article-tl__toc-list a.is-active {
  color: var(--ink-primary);
  font-weight: var(--weight-medium);
}
.article-tl__toc-cite {
  font-size: 0.8125rem;
  color: var(--ink-secondary);
  line-height: 1.5;
  margin: 0;
}
.article-tl__toc-cite a { color: var(--ink-primary); }

.article-tl__column {
  display: flex;
  flex-direction: column;
  gap: var(--s-7);
  min-width: 0;
}

.article-tl__lede {
  border-left: 2px solid var(--ink-primary);
  padding-left: var(--s-4);
  margin: 0;
}
.article-tl__lede p {
  font-size: 1.25rem;
  line-height: 1.55;
  color: var(--ink-primary);
  font-family: var(--font-serif);
  margin: 0;
}

/* ----- Stack visualization stage ----- */
.article-tl__stage {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  overflow: hidden;
  isolation: isolate;
}
.article-tl__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}
.article-tl__stage-fallback {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--t-base) var(--ease-out);
}
@media (prefers-reduced-motion: reduce) {
  .article-tl__canvas { display: none; }
  .article-tl__stage-fallback { opacity: 1; }
}
/* On phones the canvas crowds the static fallback (numbers and titles
   collide). Force the readable static stack and hide the canvas below
   720px regardless of motion preference. */
@media (max-width: 720px) {
  .article-tl__stage {
    aspect-ratio: auto;
    height: auto;
    padding: var(--s-4);
    background: var(--surface-base);
  }
  .article-tl__canvas { display: none; }
  .article-tl__stage-fallback {
    position: static;
    inset: auto;
    opacity: 1;
    display: block;
    pointer-events: auto;
  }
  .stack-static {
    width: 100%;
    padding: 0;
  }
}
.stack-static {
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: min(100%, 480px);
  padding: var(--s-5);
}
.stack-static li {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  background: var(--surface-base);
  color: var(--ink-secondary);
}
.stack-static li.is-trust-layer {
  border: 2px solid var(--ink-primary);
  color: var(--ink-primary);
  font-weight: var(--weight-semibold);
}

/* ----- Prose + references ----- */
.article-tl__prose { max-width: 720px; }
.article-tl__prose h2 {
  margin-top: var(--s-7);
  scroll-margin-top: calc(var(--header-h) + var(--s-4));
}
.article-tl__prose h2 + p { margin-top: var(--s-3); }
.article-tl__prose ol li,
.article-tl__prose ul li { margin-bottom: var(--s-2); }

.article-tl__refs {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  list-style: decimal-leading-zero;
  padding-left: 2rem;
  color: var(--ink-secondary);
}
.article-tl__refs li { margin-bottom: var(--s-2); }
.article-tl__refs em { font-style: italic; }