/*
 * Atlas Systems long-form article presentation v2.
 *
 * This same-origin layer is shared by protected historical articles and future
 * generator output. It changes presentation only; article body markup and prose
 * remain owned by their original publication source.
 */

html {
  scroll-padding-top: calc(var(--atlas-header-height, 56px) + 32px);
}

body {
  font-size: 16px;
  line-height: 1.7;
}

main {
  width: min(100%, 1160px);
  overflow-x: clip;
}

.article-header {
  gap: clamp(32px, 5vw, 64px);
  padding-top: calc(var(--atlas-header-height, 56px) + clamp(56px, 8vw, 96px));
  padding-bottom: clamp(48px, 7vw, 80px);
}

.header-meta {
  gap: 12px;
}

.article-title {
  max-width: 18ch;
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  line-height: .98;
}

.article-subtitle,
.spec-value,
.outcome-value,
.engine-item,
.intensity-item {
  font-size: 14px;
  line-height: 1.65;
}

.article-lede {
  max-width: 640px;
  font-size: 16px;
  line-height: 1.8;
}

.article-index,
.article-date,
.article-read-time,
.section-label,
.tag,
.spec-label,
.toc-label,
.toc-item a,
.callout-label,
.phase-num,
.outcome-label,
.engine-label,
.video-label,
.footer-next {
  font-size: 11px;
}

.tag {
  padding: 4px 8px;
}

.spec-strip {
  margin: clamp(32px, 5vw, 56px) 0;
}

.spec-cell {
  min-width: 0;
  padding: 16px 20px;
}

.article-body {
  min-width: 0;
  grid-template-columns: minmax(160px, 200px) minmax(0, 720px);
  gap: clamp(40px, 6vw, 72px);
  justify-content: center;
  padding: clamp(48px, 7vw, 80px) 0;
}

.prose {
  min-width: 0;
  width: 100%;
  max-width: 720px;
}

.prose h2 {
  margin: 56px 0 20px;
  font-size: clamp(1.9rem, 3vw, 2.4rem);
}

.prose h3 {
  font-size: 14px;
  line-height: 1.5;
}

.prose p,
.prose ul li,
.prose ol li {
  font-size: 16px;
  line-height: 1.8;
}

.callout p,
.data-table,
.model-table,
.model-table td,
.model-table th {
  font-size: 14px;
  line-height: 1.75;
}

.callout,
.outcome-cell,
.engine-cell,
.intensity-cell {
  padding: 20px 24px;
}

.table-wrap,
.model-table,
.prose pre {
  max-width: 100%;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
}

.prose img,
.prose video,
.video-embed,
.prose iframe {
  max-width: 100%;
}

.back-link,
.footer-back,
.toc-item a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.toc-item a {
  width: 100%;
}

.article-footer {
  gap: 24px;
  padding: 40px 0 56px;
}

:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--accent, #f5a623);
  outline-offset: 3px;
}

@media (max-width: 900px) {
  .article-header {
    grid-template-columns: 1fr;
  }

  .article-title {
    max-width: 22ch;
  }

  .article-body {
    grid-template-columns: minmax(0, 720px);
  }
}

@media (max-width: 680px) {
  main {
    padding-inline: 20px;
  }

  .article-header {
    padding-top: calc(var(--atlas-header-height, 56px) + 48px);
    padding-bottom: 48px;
  }

  .article-title {
    font-size: clamp(2.35rem, 13vw, 3.4rem);
  }

  .spec-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .article-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .outcomes-grid,
  .engine-grid,
  .intensity-grid {
    grid-template-columns: 1fr;
  }

  /*
   * Historical technical articles contain tables and terminal transcripts
   * whose intrinsic width exceeds a phone viewport. Wrap them at this
   * breakpoint so the page does not create keyboard-inaccessible horizontal
   * scroll regions.
   */
  .model-table,
  .data-table {
    table-layout: fixed;
    overflow: visible;
  }

  .model-table th,
  .model-table td,
  .data-table th,
  .data-table td,
  .model-table code,
  .data-table code {
    overflow-wrap: anywhere;
    word-break: break-word;
  }

  .prose pre {
    overflow-x: visible;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
  }

  .prose pre code {
    white-space: inherit;
  }
}

@media (max-width: 390px) {
  main {
    padding-inline: 16px;
  }

  .spec-strip {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto !important;
  }

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}