app/src/styles/_layout.css

/* ============================================================================ */
/* Layout – 3-column grid (Table of Contents / Article / Aside) */
/* ============================================================================ */

.content-grid {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--content-padding-x);
  margin-top: 40px;
  display: grid;
  grid-template-columns: 260px minmax(0, 680px) 260px;
  gap: 32px;
  align-items: start;
}

.content-grid>main {
  max-width: 100%;
  margin: 0;
  padding: 0;
}

.content-grid>main>*:first-child {
  margin-top: 0;
}

@media (--bp-content-collapse) {
  .content-grid {
    overflow: hidden;
    display: block;
    margin-top: var(--spacing-2);
  }

  .content-grid {
    grid-template-columns: 1fr;
  }

  .table-of-contents {
    position: static;
    display: none;
  }

  .table-of-contents-mobile {
    display: block;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .footer-inner>h3 {
    grid-column: auto;
    margin-top: 16px;
  }

  .footer-inner {
    display: block;
    padding: 40px 16px;
  }
}



/* ============================================================================ */
/* Width helpers – slightly wider than main column, and full-width to viewport */
/* ---------------------------------------------------------------------------- */

.wide,
.full-width {
  box-sizing: border-box;
  position: relative;
  z-index: var(--z-elevated);
  background-color: var(--background-color);
}

.wide {
  /* Target up to ~1100px while staying within viewport minus page gutters */
  width: min(1100px, 100vw - var(--content-padding-x) * 4);
  margin-left: 50%;
  transform: translateX(-50%);
  padding: calc(var(--content-padding-x)*4);
  border-radius: calc(var(--button-radius)*4);
  background-color: var(--page-bg);
  -webkit-mask:
    linear-gradient(to right, transparent 0px, black 20px, black calc(100% - 20px), transparent 100%),
    linear-gradient(to bottom, transparent 0px, black 20px, black calc(100% - 20px), transparent 100%);
  -webkit-mask-composite: intersect;
  mask:
    linear-gradient(to right, transparent 0px, black 20px, black calc(100% - 20px), transparent 100%),
    linear-gradient(to bottom, transparent 0px, black 20px, black calc(100% - 20px), transparent 100%);
  mask-composite: intersect;
}

.wide>* {
  margin-bottom: 0 !important;
}

.full-width {
  /* Span the full viewport width and center relative to viewport */
  width: 100vw;
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
  padding: calc(var(--content-padding-x)*4);
  border-radius: calc(var(--button-radius)*4);
  background-color: var(--page-bg);
  -webkit-mask:
    linear-gradient(to bottom, transparent 0px, black 20px, black calc(100% - 20px), transparent 100%);
  mask:
    linear-gradient(to bottom, transparent 0px, black 20px, black calc(100% - 20px), transparent 100%);
}

.full-width figure figcaption {
  text-align: center !important;
}

@media (--bp-content-collapse) {

  .wide,
  .full-width {
    width: 100%;
    margin-left: 0;
    margin-right: 0;
    padding: 0;
    transform: none;
  }
}

/* ============================================================================ */
/* Theme toggle placement                                                       */
/* ============================================================================ */

#theme-toggle {
  position: absolute;
  top: var(--spacing-4);
  left: var(--spacing-3);
  margin: 0;
  z-index: var(--z-overlay);
}

/* ------------------------------------------------------------------------- */
/* Hero meta bar responsiveness                                               */
/* Two columns at collapse breakpoint, then one column below small screens    */
/* ------------------------------------------------------------------------- */
@media (--bp-sm) {
  header.meta .meta-container {
    display: flex;
    flex-wrap: wrap;
    row-gap: 12px;
    column-gap: 8px;
    max-width: 100%;
    padding: 0 var(--spacing-4);
  }

  header.meta .meta-container .meta-container-cell {
    flex: 1 1 calc(50% - 8px);
    min-width: 0;
  }
}

@media (--bp-xxs) {
  header.meta .meta-container .meta-container-cell {
    flex-basis: 100%;
    text-align: center;
  }

  /* Center ordered list numbers within meta (e.g., affiliations) */
  header.meta .affiliations {
    list-style-position: inside;
    padding-left: 0;
    margin-left: 0;
  }

  header.meta .affiliations li {
    text-align: center;
  }
}


/* ------------------------------------------------------------------------- */
/* D3 neural embed responsiveness                                            */
/* Stack canvas (left) over network (right) on small screens                 */
/* ------------------------------------------------------------------------- */
@media (--bp-md) {
  .d3-neural .panel {
    flex-direction: column;
  }

  .d3-neural .panel .left {
    flex: 0 0 auto;
    width: 100%;
  }

  .d3-neural .panel .right {
    flex: 0 0 auto;
    width: 100%;
    min-width: 0;
  }
}

/* ============================================================================ */
/* Bibliography/References - hide inline sections that should be in footer      */
/* ---------------------------------------------------------------------------- */
/* References sections with data-built-refs are generated per-chapter by
   rehype-citation. The Footer.astro script consolidates them into the footer.
   These styles ensure inline refs don't display in the main content area. */

/* References in main content should not be displayed - they belong in footer.
   The Footer.astro script moves them; this CSS is a visual safeguard. */
main [data-built-refs],
main #references:not(.footer-processed),
main section.references:not(ol),
main div.references:not(ol),
main .bibliography:not(ol) {
  /* Collapse to zero height to prevent layout impact, but keep in DOM for JS */
  max-height: 0;
  overflow: hidden;
  margin: 0 !important;
  padding: 0 !important;
  border: none !important;
  opacity: 0;
  pointer-events: none;
}

/* Once moved to footer, these styles don't apply (not inside main) */