/* === blog_templates/blog_detail.html === */
  /* ---------- Layout artículo + sidebar ---------- */
  .article-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-2xl);
  }
  /* En grid, cada item nace con min-width:auto y no encoge bajo el ancho de su
     contenido; un bloque ancho (ecuación, tabla, pre) estiraría la columna más
     allá del viewport. min-width:0 deja que el contenido se contenga/scrollee. */
  .article-layout > * { min-width: 0; }
  @media (min-width: 1024px) {
    .article-layout {
      grid-template-columns: minmax(0, 1fr) 280px;
      gap: var(--space-3xl);
    }
  }

  /* ---------- Breadcrumb ---------- */
  .crumbs {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-xs);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--color-on-surface-muted);
    margin: 0 0 var(--space-xl) 0;
    padding: 0;
    list-style: none;
  }
  .crumbs li { display: inline-flex; align-items: center; }
  .crumbs li + li::before {
    content: '/';
    margin: 0 var(--space-xs);
    color: var(--color-border-strong);
  }
  .crumbs a {
    color: var(--color-on-surface-muted);
    text-decoration: none;
    transition: color var(--dur-base) var(--ease-out-quart);
  }
  .crumbs a:hover { color: var(--color-secondary); }
  .crumbs li[aria-current="page"] { color: var(--color-on-surface); }

  /* ---------- Cabecera artículo ---------- */
  .article-head {
    margin-bottom: var(--space-2xl);
  }
  .article-head__meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-sm) var(--space-md);
    margin-bottom: var(--space-lg);
  }
  .article-head__meta-item {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--color-on-surface-muted);
    letter-spacing: 0.02em;
  }
  .article-byline {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin: 0 0 var(--space-md) 0;
    min-width: 0;
  }
  .article-byline__photo {
    width: 40px;
    height: 40px;
    flex: none;
    border-radius: 50%;
    object-fit: cover;
    border: 1px solid var(--color-border-strong);
  }
  .article-byline__text { min-width: 0; }
  .article-byline__name,
  .article-byline__meta { margin: 0; overflow-wrap: anywhere; }
  .article-byline__name { font-size: 0.9375rem; color: var(--color-on-surface-muted); }
  .article-byline__name a { color: var(--color-on-surface); font-weight: 600; text-decoration: none; }
  .article-byline__name a:hover { text-decoration: underline; text-underline-offset: 3px; }
  .article-byline__meta { font-family: var(--font-mono); font-size: 0.8125rem; color: var(--color-on-surface-muted); letter-spacing: 0.02em; }
  .article-head__title {
    margin: 0 0 var(--space-md) 0;
    overflow-wrap: break-word;
    word-wrap: break-word;
  }

  .article-hero-image {
    margin: var(--space-xl) 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
  }
  .article-hero-image img {
    width: 100%;
    height: auto;
    display: block;
  }

  /* ---------- Contenido del artículo (prose) ---------- */
  .article-content {
    color: var(--color-on-surface);
    font-size: 1.0625rem;
    line-height: 1.75;
    max-width: 68ch;
    min-width: 0;
    /* Palabras/URLs/identificadores largos (branch_and_bound, cvxpy...) rompen
       en móvil en vez de forzar scroll horizontal de toda la página. */
    overflow-wrap: break-word;
    word-wrap: break-word;
  }
  .article-content > * + * { margin-top: var(--space-md); }
  .article-content h2 {
    font-family: var(--font-sans);
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.015em;
    color: var(--color-on-background);
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-md);
  }
  .article-content h3 {
    font-family: var(--font-sans);
    font-size: 1.375rem;
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-on-background);
    margin-top: var(--space-xl);
    margin-bottom: var(--space-sm);
  }
  .article-content h4 {
    font-family: var(--font-sans);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-on-background);
    margin-top: var(--space-lg);
    margin-bottom: var(--space-xs);
  }
  .article-content p { margin: 0; }
  .article-content strong { color: var(--color-on-background); font-weight: 600; }
  .article-content a {
    color: var(--color-secondary);
    text-decoration: underline;
    text-decoration-color: rgba(34, 211, 238, 0.4);
    text-underline-offset: 2px;
    transition: color var(--dur-base) var(--ease-out-quart);
  }
  .article-content a:hover {
    color: var(--color-primary);
    text-decoration-color: var(--color-primary);
  }
  .article-content ul,
  .article-content ol {
    padding-left: var(--space-xl);
  }
  .article-content li + li { margin-top: var(--space-xs); }
  .article-content blockquote {
    margin: var(--space-lg) 0;
    padding: var(--space-md) var(--space-lg);
    border-left: 3px solid var(--color-primary);
    background: var(--color-surface);
    color: var(--color-on-surface);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
  }
  .article-content blockquote p { margin: 0; }
  .article-content img {
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    margin: var(--space-lg) auto;
  }
  .article-content hr {
    border: 0;
    border-top: 1px solid var(--color-border);
    margin: var(--space-2xl) 0;
  }
  .article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-lg) 0;
    font-size: 0.9375rem;
  }
  .article-content th,
  .article-content td {
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--color-border);
    text-align: left;
  }
  .article-content th {
    color: var(--color-on-background);
    font-weight: 600;
    background: var(--color-surface);
  }
  /* En móvil las tablas anchas (varias columnas) se recortaban. Se vuelven un
     bloque con scroll horizontal propio; nowrap mantiene las columnas legibles
     en vez de aplastarlas. En pantallas grandes conservan el layout normal. */
  @media (max-width: 640px) {
    .article-content table {
      display: block;
      width: 100%;
      overflow-x: auto;
      white-space: nowrap;
      -webkit-overflow-scrolling: touch;
    }
  }
  /* Inline code dentro del artículo */
  .article-content :not(pre) > code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    background: var(--color-surface-alt);
    color: var(--color-on-background);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
  }
  /* Bloques de código de Prism — los respetamos para que Prism pinte tokens,
     pero envolvemos el contenedor con la estética terminal del sistema. */
  .article-content pre[class*="language-"],
  .article-content pre {
    background: var(--color-code-bg);
    color: var(--color-on-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    line-height: 1.55;
    margin: var(--space-lg) 0;
  }
  .article-content pre code {
    background: transparent;
    border: 0;
    padding: 0;
    color: inherit;
    font-size: inherit;
  }

  /* MathJax — texto legible sobre fondo oscuro */
  .article-content mjx-container { color: var(--color-on-background); max-width: 100%; }
  /* Ecuaciones en display (\[ ... \]) tienen ancho fijo y no envuelven: en móvil
     se salían del viewport y se recortaban. Se les da su propio scroll horizontal
     para que sean legibles sin romper el layout de la página. */
  .article-content mjx-container[display="true"] {
    display: block;
    overflow-x: auto;
    overflow-y: hidden;
    max-width: 100%;
    padding-bottom: 4px;
  }

  /* ---------- Tags del artículo ---------- */
  .article-tags {
    margin-top: var(--space-2xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
  }
  .article-tags__label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-on-surface-muted);
    margin: 0 0 var(--space-sm) 0;
  }
  .article-tags__list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
  }
  .article-tags__list .badge-tag {
    text-decoration: none;
    transition:
      border-color var(--dur-base) var(--ease-out-quart),
      color var(--dur-base) var(--ease-out-quart);
  }
  .article-tags__list .badge-tag:hover {
    border-color: var(--color-border-strong);
    color: var(--color-on-background);
  }

  /* ---------- Sidebar ---------- */
  .article-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
  }
  @media (min-width: 1024px) {
    .article-sidebar { position: sticky; top: 88px; align-self: start; }
  }

  .staff-preview-bar {
    margin: 0 0 var(--space-lg);
    padding: 10px 14px;
    border: 1px solid var(--color-warning, #F59E0B);
    border-radius: 8px;
    font-size: 0.875rem;
  }
  .sidebar-block {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
  }
  .sidebar-block__label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-secondary);
    margin: 0 0 var(--space-md) 0;
  }

  .related-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
  }
  .related-list li + li {
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-divider);
  }
  .related-item {
    display: flex;
    gap: var(--space-sm);
    align-items: flex-start;
    text-decoration: none;
    color: var(--color-on-surface);
    transition: color var(--dur-base) var(--ease-out-quart);
  }
  .related-item:hover { color: var(--color-on-background); }
  .related-item__thumb {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    border: 1px solid var(--color-border);
  }
  .related-item__title {
    margin: 0 0 var(--space-xs) 0;
    font-size: 0.9375rem;
    font-weight: 600;
    line-height: 1.35;
    color: var(--color-on-background);
  }
  .related-item__time {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-on-surface-muted);
  }
  .related-empty {
    margin: 0;
    color: var(--color-on-surface-muted);
    font-size: 0.9375rem;
  }

  .tagcloud {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
  }
  .tagcloud .badge-tag {
    text-decoration: none;
    transition:
      border-color var(--dur-base) var(--ease-out-quart),
      color var(--dur-base) var(--ease-out-quart);
  }
  .tagcloud .badge-tag:hover {
    border-color: var(--color-border-strong);
    color: var(--color-on-background);
  }

  /* ---------- Caja "El paper" ---------- */
  .paper-box {
    margin-top: var(--space-xl);
    padding: var(--space-lg);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-secondary);
    border-radius: var(--radius-lg);
    overflow-wrap: anywhere;
  }
  .paper-box__label {
    margin: 0 0 var(--space-xs);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-secondary);
  }
  .paper-box__title { margin: 0 0 var(--space-md); font-size: 1.125rem; line-height: 1.35; }
  .paper-box__meta { margin: 0 0 var(--space-md); display: grid; gap: var(--space-sm); }
  .paper-box__meta div { display: grid; grid-template-columns: 7.5rem 1fr; gap: var(--space-sm); }
  .paper-box__meta dt { color: var(--color-on-surface-muted); font-weight: 500; }
  .paper-box__meta dd { margin: 0; }
  .paper-box { margin-bottom: var(--space-xl); }
  .paper-refs { margin-top: var(--space-xl); font-size: 0.875rem; overflow-wrap: anywhere; }
  .paper-refs__title { font-size: 1rem; margin: 0 0 var(--space-sm); }
  .paper-refs__item { margin: 0; color: var(--color-on-surface-muted); }
  .pypro-chart { margin: var(--space-xl) 0; max-width: 100%; min-width: 0; }
  .pypro-chart canvas { display: block; max-width: 100%; height: auto; }
  .pypro-chart figcaption { margin-top: var(--space-sm); font-size: 0.8125rem; color: var(--color-on-surface-muted); }
  @media (max-width: 480px) { .paper-box__meta div { grid-template-columns: 1fr; gap: 0; } }

/* === blog_templates/blog_index.html === */
  /* ---------- Filtros de categoría ---------- */
  .cat-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
  }
  .cat-filter {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 500;
    line-height: 1.4;
    border-radius: var(--radius-full);
    background: var(--color-surface);
    color: var(--color-on-surface-muted);
    border: 1px solid var(--color-border);
    text-decoration: none;
    transition:
      background var(--dur-base) var(--ease-out-quart),
      color var(--dur-base) var(--ease-out-quart),
      border-color var(--dur-base) var(--ease-out-quart);
  }
  .cat-filter:hover {
    background: var(--color-surface-alt);
    border-color: var(--color-border-strong);
    color: var(--color-on-background);
  }
  .cat-filter.is-active {
    background: var(--color-primary-container);
    color: var(--color-secondary);
    border-color: transparent;
  }

  /* ---------- Grid de tarjetas ---------- */
  .articles-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  @media (min-width: 640px)  { .articles-grid { grid-template-columns: 1fr 1fr; } }
  @media (min-width: 1024px) { .articles-grid { grid-template-columns: 1fr 1fr 1fr; } }

  .article-card {
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition:
      border-color var(--dur-base) var(--ease-out-quart),
      transform var(--dur-base) var(--ease-out-quart),
      background var(--dur-base) var(--ease-out-quart);
  }
  .article-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    background: var(--color-surface-alt);
  }

  .article-card__media {
    display: block;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--color-surface-alt);
  }
  .article-card__media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--dur-slow) var(--ease-out-quart);
  }
  .article-card:hover .article-card__media img {
    transform: scale(1.03);
  }
  .article-card__placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-on-surface-muted);
  }
  .article-card__placeholder svg {
    width: 56px;
    height: 56px;
  }

  .article-card__body {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    padding: var(--space-lg);
    flex: 1;
  }

  .article-card__meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-sm);
  }
  .article-card__paper {
    color: var(--color-secondary);
    border-color: var(--color-secondary);
  }
  .article-card__time {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-on-surface-muted);
    letter-spacing: 0.02em;
  }

  .article-card__title {
    margin: 0;
    line-height: 1.3;
  }
  .article-card__title a {
    color: var(--color-on-background);
    text-decoration: none;
    transition: color var(--dur-base) var(--ease-out-quart);
  }
  .article-card__title a:hover {
    color: var(--color-primary);
  }

  .article-card__excerpt {
    margin: 0;
    flex: 1;
  }

  .article-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
  }
  .article-card__tags .badge-tag {
    text-decoration: none;
    transition:
      border-color var(--dur-base) var(--ease-out-quart),
      color var(--dur-base) var(--ease-out-quart);
  }
  .article-card__tags .badge-tag:hover {
    border-color: var(--color-border-strong);
    color: var(--color-on-background);
  }

  /* ---------- Empty state ---------- */
  .articles-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--space-3xl) var(--space-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
  }
  .articles-empty .t-title { margin: 0 0 var(--space-sm) 0; }
  .articles-empty .t-body { margin: 0; max-width: 40ch; margin-left: auto; margin-right: auto; }

/* === blog_templates/artifact_index.html: sin reglas propias; usa .articles-grid/.article-card/.articles-empty de blog_index.html (idénticas) === */

/* === blog_templates/artifact_detail.html === */
  .staff-preview-bar {
    margin: 0 0 var(--space-lg);
    padding: 10px 14px;
    border: 1px solid var(--color-warning, #F59E0B);
    border-radius: 8px;
    font-size: 0.875rem;
  }
  .artifact-head { text-align: center; }
  .artifact-head .badge-tech {
    display: inline-block;
    margin-bottom: var(--space-md);
  }
  .artifact-head__title { margin: 0 0 var(--space-sm); }
  .artifact-head__subtitle {
    max-width: 60ch;
    margin-left: auto;
    margin-right: auto;
  }
  .artifact-frame-wrap {
    margin-top: var(--space-xl);
    border: 1px solid var(--color-outline, rgba(255,255,255,.12));
    border-radius: var(--radius-lg, 16px);
    overflow: hidden;
    background: #fff;
  }
  .artifact-frame {
    display: block;
    width: 100%;
    height: 85vh;
    min-height: 640px;
    border: 0;
  }
  /* CTA primario (arriba): el que queremos que jale el clic. */
  .artifact-cta-top {
    margin-top: var(--space-lg);
    text-align: center;
  }
  .artifact-cta-top .btn { gap: var(--space-xs); }
  .artifact-cta-top__icon {
    width: 18px;
    height: 18px;
  }
  /* Enlace secundario (abajo): discreto a proposito, para no competir. */
  .artifact-fullscreen {
    margin-top: var(--space-lg);
    text-align: center;
    font-size: 0.8125rem;
  }
  .artifact-fullscreen a {
    color: var(--color-on-surface-muted);
    text-decoration: none;
  }
  .artifact-fullscreen a:hover { color: var(--color-primary); }
  .artifact-more { margin-top: var(--space-3xl, 64px); }
  .artifact-more__title { margin: 0 0 var(--space-lg); }
  /* Esta página no anima la entrada: gana sobre `.js .fade-up` de pypro.css.
     Va con .artifact-page porque blog.css la cargan también el blog y la biblioteca. */
  .js .artifact-page .fade-up { opacity: 1; transform: none; }

/* === biblioteca_templates/_styles.html === */
  .bib-hero { padding: calc(var(--space-3xl) + var(--space-xl)) 0 var(--space-lg); }
  .bib-hero h1 { margin: var(--space-sm) 0 var(--space-md); }
  .bib-preview {
    background: var(--color-primary-container); color: var(--color-secondary);
    border-bottom: 1px solid var(--color-border); text-align: center;
    padding: var(--space-sm) var(--space-md); font-family: var(--font-mono); font-size: 0.8125rem;
  }
  .bib-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-lg); }
  @media (min-width: 640px)  { .bib-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
  @media (min-width: 1024px) { .bib-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
  .bib-card {
    display: flex; flex-direction: column; background: var(--color-surface);
    border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden;
    transition: border-color var(--dur-base) var(--ease-out-quart), background var(--dur-base) var(--ease-out-quart);
  }
  .bib-card:hover { border-color: var(--color-primary); background: var(--color-surface-alt); }
  .bib-card__media { display: block; aspect-ratio: 16 / 9; background: var(--color-surface-alt); overflow: hidden; }
  .bib-card__media img { width: 100%; height: 100%; object-fit: cover; }
  .bib-card__ph {
    width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
    color: var(--color-on-surface-muted); font-family: var(--font-mono); font-size: 1.5rem;
  }
  .bib-card__body { display: flex; flex-direction: column; gap: var(--space-sm); padding: var(--space-lg); flex: 1; min-width: 0; }
  .bib-card__title { margin: 0; line-height: 1.3; overflow-wrap: anywhere; }
  .bib-card__title a { color: var(--color-on-background); text-decoration: none; }
  .bib-card__title a:hover { color: var(--color-primary); }
  .bib-card__meta { font-family: var(--font-mono); font-size: 0.75rem; color: var(--color-on-surface-muted); margin: 0; overflow-wrap: anywhere; }
  .bib-card__text { margin: 0; flex: 1; }
  .bib-badges { display: flex; flex-wrap: wrap; gap: var(--space-xs); }
  .bib-more { margin-top: var(--space-lg); }

  .bib-filters { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-sm); margin-bottom: var(--space-lg); }
  @media (min-width: 768px) { .bib-filters { grid-template-columns: 2fr 1.2fr 1.2fr 0.8fr auto; align-items: end; } }
  .bib-filters label { display: block; font-size: 0.75rem; color: var(--color-on-surface-muted); margin-bottom: 4px; font-family: var(--font-mono); }
  .bib-filters input, .bib-filters select {
    width: 100%; min-width: 0; padding: 10px 12px; font: inherit; font-size: 0.9375rem;
    background: var(--color-surface); color: var(--color-on-background);
    border: 1px solid var(--color-border); border-radius: 8px;
  }
  .bib-pager { display: flex; gap: var(--space-md); align-items: center; justify-content: center; margin-top: var(--space-xl); font-family: var(--font-mono); font-size: 0.875rem; }

  .bib-detail { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-xl); }
  @media (min-width: 1024px) { .bib-detail { grid-template-columns: minmax(0, 1fr) 320px; align-items: start; } }
  .bib-detail__main { min-width: 0; }
  .bib-cover { display: block; width: 100%; max-width: 70ch; height: auto; aspect-ratio: 16 / 9; object-fit: cover;
    margin: 0 0 var(--space-lg); border: 1px solid var(--color-border); border-radius: var(--radius-lg); }
  .bib-hero h1 { overflow-wrap: anywhere; }
  .bib-side { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: var(--space-lg); display: flex; flex-direction: column; gap: var(--space-md); min-width: 0; }
  .bib-side dl { margin: 0; display: grid; gap: var(--space-sm); font-size: 0.875rem; }
  .bib-side dt { font-family: var(--font-mono); font-size: 0.75rem; color: var(--color-on-surface-muted); }
  .bib-side dd { margin: 0; overflow-wrap: anywhere; }
  .bib-actions { display: flex; flex-wrap: wrap; gap: var(--space-sm); margin: var(--space-md) 0; }
  .bib-note { font-size: 0.8125rem; color: var(--color-on-surface-muted); margin: 0; }
  .bib-block { margin-top: var(--space-xl); }
  .bib-block h2 { margin: 0 0 var(--space-md); }
  .bib-explain {
    display: block; padding: var(--space-md) var(--space-lg); margin: var(--space-md) 0;
    background: var(--color-primary-container); border-radius: var(--radius-lg);
    color: var(--color-secondary); text-decoration: none; font-weight: 600;
  }

  .viewer { margin: var(--space-lg) 0; }
  .viewer__frame { display: none; width: 100%; height: 80vh; min-height: 520px; border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-surface); }
  .viewer__mobile { display: block; }
  @media (min-width: 768px) {
    .viewer__frame { display: block; }
    .viewer__mobile { display: none; }
  }
  .yt-embed { position: relative; aspect-ratio: 16 / 9; width: 100%; }
  .yt-embed iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; border-radius: var(--radius-lg); }