frontend/src/styles/_layout.css

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

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

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

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

@media (max-width: 1100px) {
  .content-grid {
    overflow: hidden;
    display: block;
    margin-top: var(--spacing-2);
    grid-template-columns: 1fr;
  }

  /* Hide only the desktop TOC (the one rendered inside .content-grid).
     We must NOT match the editor's mobile drawer, which renders the same
     React TableOfContents component inside .toc-mobile-sidebar - matching
     it here would empty the hamburger menu on narrow viewports. */
  .content-grid .table-of-contents {
    position: static;
    display: none;
  }

  /* Footer responsive styles live in components/_footer.css to keep all
     footer-related selectors in one place (the heading selectors need to
     descend past `display: contents` wrappers, so they cannot use a direct
     child combinator). */
}



/* ============================================================================ */
/* 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(--page-bg);
}

.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 (max-width: 1100px) {
  .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-4);
  margin: 0;
  z-index: var(--z-overlay);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--page-bg);
  box-shadow: 0 2px 12px rgba(0,0,0,.08);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  cursor: pointer;
  color: var(--text-color);
  transition: transform 150ms ease, box-shadow 150ms ease;
}
#theme-toggle:active {
  transform: scale(0.92);
}

/* Editor quick-access pill (published page only). The element ships
   with `hidden` and the inline script in the published page reveals
   it only when /api/auth/status returns canEdit=true, after also
   filling in the avatar / handle. We split the rules across the
   element + a class so the JS can target the id (it's stable across
   page exports) while the styles live on the class. */
#edit-link.edit-pill {
  position: absolute;
  top: var(--spacing-4);
  right: var(--spacing-4);
  margin: 0;
  z-index: var(--z-overlay);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 4px 4px 4px 6px;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  background: var(--page-bg);
  color: var(--text-color);
  text-decoration: none;
  box-shadow: 0 2px 12px rgba(0,0,0,.08);
  font-size: 13px;
  line-height: 1.2;
  transition: transform 150ms ease, box-shadow 150ms ease,
    border-color 150ms ease;
}
#edit-link.edit-pill:hover {
  border-color: color-mix(in srgb, var(--primary-color) 50%, var(--border-color));
  box-shadow: 0 4px 16px rgba(0,0,0,.12);
}
#edit-link.edit-pill:active {
  transform: scale(0.98);
}
#edit-link.edit-pill[hidden] {
  display: none;
}

.edit-pill__avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  background: var(--surface-bg);
}

.edit-pill__text {
  color: var(--muted-color);
  white-space: nowrap;
}
.edit-pill__name {
  color: var(--text-color);
  font-weight: 600;
}

.edit-pill__cta {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--primary-color);
  color: #fff;
  font-weight: 600;
  font-size: 12px;
  white-space: nowrap;
  flex-shrink: 0;
}
.edit-pill__cta svg {
  stroke: currentColor;
}

@media (max-width: 1100px) {
  #theme-toggle,
  #edit-link.edit-pill {
    display: none;
  }
}

/* ------------------------------------------------------------------------- */
/* Hero meta bar responsiveness                                               */
/* Two columns at md breakpoint, then one column on very small screens.       */
/* ------------------------------------------------------------------------- */
@media (max-width: 768px) {
  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 (max-width: 320px) {
  header.meta .meta-container .meta-container-cell {
    flex-basis: 100%;
    text-align: center;
  }

  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 (max-width: 768px) {
  .d3-neural .panel {
    flex-direction: column;
  }

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

/* ============================================================================ */
/* Auto figure numbering                                                        */
/* Applies a CSS counter across all figure-bearing components:                  */
/* Reference (.reference-wrapper), Image (.image-wrapper figure),               */
/* and HtmlEmbed (.html-embed)                                                  */
/* ============================================================================ */

.content-grid > main {
  counter-reset: figure;
}

/* Increment on every figure-like component */
.content-grid > main .reference-wrapper,
.content-grid > main .image-wrapper > figure,
.content-grid > main figure.html-embed {
  counter-increment: figure;
}

/* Display "Figure N · " before each figcaption */
.content-grid > main .reference-wrapper .reference__caption::before,
.content-grid > main .image-wrapper > figure > figcaption::before,
.content-grid > main figure.html-embed > .html-embed__desc::before {
  content: "Figure " counter(figure) " · ";
  font-weight: 600;
}

/* ============================================================================ */
/* "paper" template - academic project-page layout (single centered column)     */
/* Activated by frontmatter `template: "paper"` -> data-template="paper"        */
/* Reference: academic project pages like diffusion-cot.github.io               */
/* ============================================================================ */

/* ---- Paper hero banner: placed between meta and content in index.astro ---- */

.paper-hero-banner {
  max-width: 920px;
  margin: 32px auto 0;
  padding: 0 16px;
}

.paper-hero-banner :global(.html-embed) {
  border-radius: 8px;
  overflow: hidden;
}

.paper-hero-banner :global(.html-embed__card) {
  border-radius: 8px;
}

/* Thin separator between banner area and content */
[data-template="paper"] .paper-hero-banner + .content-grid {
  margin-top: 48px;
  border-top: 1px solid var(--border-color);
  padding-top: 40px;
}

/* When no banner, separator is directly below meta */
[data-template="paper"] .meta + .content-grid,
[data-template="paper"] .hero-paper-meta + .content-grid {
  margin-top: 32px;
  border-top: 1px solid var(--border-color);
  padding-top: 40px;
}

/* ---- Content grid: single centered column, no TOC ---- */

[data-template="paper"] .content-grid {
  grid-template-columns: minmax(0, 780px);
  justify-content: center;
  margin-top: 0;
}

[data-template="paper"] .table-of-contents {
  display: none;
}

/* ---- Typography: clean left-aligned headings ---- */

[data-template="paper"] .content-grid > main h2 {
  text-align: left;
  font-size: 1.75em;
  font-weight: 700;
  margin-top: 2.5em;
  margin-bottom: 0.8em;
  border-bottom: none;
  padding-bottom: 0;
}

[data-template="paper"] .content-grid > main h2 a {
  background: none;
}

[data-template="paper"] .content-grid > main h2:first-child,
[data-template="paper"] .content-grid > main > *:first-child h2 {
  margin-top: 0;
}

[data-template="paper"] .content-grid > main h3 {
  font-size: 1.3em;
  font-weight: 600;
  margin-top: 2em;
  margin-bottom: 0.6em;
}

/* ---- No figure numbering ---- */

[data-template="paper"] .content-grid > main {
  counter-reset: none;
}

[data-template="paper"] .content-grid > main .reference-wrapper .reference__caption::before,
[data-template="paper"] .content-grid > main .image-wrapper > figure > figcaption::before,
[data-template="paper"] .content-grid > main figure.html-embed > .html-embed__desc::before {
  content: none;
}

/* ---- Footer: simple single-column block layout ---- */

[data-template="paper"] .footer-inner {
  display: block;
  max-width: 780px;
}

[data-template="paper"] .references-block > .footer-heading,
[data-template="paper"] .reuse-block > .footer-heading {
  text-align: left;
  padding-right: 0;
  margin-top: 16px;
  margin-bottom: 8px;
}

[data-template="paper"] .template-credit p {
  margin-top: 32px;
}