/* Bounded tiles shared by the research and blog indexes. */
.tiled-index {
  --tile-surface: #e6e9de;
  --tile-surface-alt: #eae8df;
  --tile-art: #e9e8dc;
  --tile-shadow: #243d340c;
}

html[data-theme="dark"] .tiled-index {
  --tile-surface: #242422;
  --tile-surface-alt: #292927;
  --tile-art: #33332f;
  --tile-shadow: #00000024;
}

body.tiled-index .hero.blog-hero {
  padding-bottom: 48px;
}

.tiled-index .blog-list {
  position: relative;
  z-index: 1;
  isolation: isolate;
}

.tiled-index .blog-list-grid {
  grid-template-columns: repeat(12, minmax(0, 1fr));
  align-items: stretch;
  gap: 24px;
}

.tiled-index .blog-card {
  grid-column: span 6;
  display: flex;
  margin: 0;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--tile-surface);
  box-shadow: 0 4px 12px var(--tile-shadow);
  transition: border-color .25s, box-shadow .25s;
}

.tiled-index :is(.research-card--reasoning, .research-card--evaluation) {
  grid-column: span 6;
}

.tiled-index :is(.research-card--reasoning, .research-card--perspective) {
  background: var(--tile-surface-alt);
}

.tiled-index .blog-card-link {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-width: 0;
  gap: 0;
  padding: 0;
  margin: 0;
  border-radius: inherit;
}

.tiled-index .blog-card-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -5px;
}

.tiled-index .blog-card-art {
  flex: none;
  width: 100%;
  height: clamp(265px, 25vw, 350px);
  aspect-ratio: auto;
  overflow: hidden;
  border-bottom: 1px solid var(--rule);
  background: var(--tile-art);
}

.tiled-index .blog-card-art img {
  object-fit: cover;
  object-position: 50% 46%;
  transition: transform .7s cubic-bezier(.22, .61, .36, 1), filter .3s;
}

.tiled-index .research-card--program .blog-card-art img {
  object-position: 50% 47%;
}

.tiled-index .blog-card-arrow {
  top: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  background: #eeefe7ed;
  backdrop-filter: blur(8px);
}

.tiled-index .blog-card-copy {
  display: flex;
  flex: 1;
  flex-direction: column;
  align-items: flex-start;
  padding: 29px 32px 34px;
}

.tiled-index .article-card-topic {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 18px;
  color: var(--muted-text);
  font: 400 10px/1.3 var(--design-sans);
  letter-spacing: .12em;
  text-transform: uppercase;
}

.tiled-index .article-card-topic::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--coral);
}

.tiled-index .blog-card h2 {
  max-width: 580px;
  margin: 0;
  font-size: clamp(30px, 2.9vw, 42px);
  line-height: 1.09;
  letter-spacing: -.045em;
}

.tiled-index :is(.research-card--reasoning, .research-card--evaluation) h2 {
  font-size: clamp(30px, 2.9vw, 40px);
}

.tiled-index .blog-card p {
  max-width: 560px;
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.65;
}

.tiled-index .blog-card:focus-within {
  border-color: var(--accent);
}

@media (hover: hover) {
  .tiled-index .blog-card:hover {
    border-color: var(--muted);
    box-shadow: 0 10px 26px var(--tile-shadow);
  }
}

html[data-theme="dark"] .tiled-index .blog-card-art img {
  filter: grayscale(1) brightness(.78);
}

html[data-theme="dark"] .tiled-index .blog-card-arrow {
  color: var(--ink);
  border-color: #f0f0e938;
  background: #242422e8;
}

html[data-theme="dark"] .tiled-index .blog-card-link:is(:hover, :focus-visible) .blog-card-arrow {
  color: var(--paper);
  background: var(--ink);
}

/* Full-width entries bookend the research pair and feature the blog essay. */
.tiled-index .blog-card--feature {
  grid-column: 1 / -1;
}

.tiled-index .blog-card--feature .blog-card-link {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  align-items: stretch;
}

.tiled-index .blog-card--feature .blog-card-art {
  height: auto;
  aspect-ratio: 1;
  border-right: 1px solid var(--rule);
  border-bottom: 0;
}

.tiled-index .blog-card--feature .blog-card-art img {
  object-fit: cover;
  object-position: center;
}

.tiled-index .blog-card--feature .blog-card-copy {
  justify-content: center;
  padding: clamp(32px, 4.5vw, 64px);
}

.tiled-index .blog-card--feature h2 {
  font-size: clamp(36px, 4vw, 56px);
  line-height: 1.06;
}

.tiled-index .blog-card--feature p {
  margin-top: 22px;
  font-size: 15px;
  line-height: 1.7;
}

@media (max-width: 1100px) {
  .tiled-index .blog-list-grid { gap: 20px; }
  .tiled-index .blog-card-copy { padding: 26px; }
  .tiled-index .blog-card-art { height: 280px; }
}

@media (max-width: 900px) and (min-width: 761px) {
  .tiled-index .blog-card-copy { padding: 23px; }
  .tiled-index .blog-card--feature .blog-card-copy { padding: 28px; }
  .tiled-index .blog-card--feature p { font-size: 14px; }
  .tiled-index .blog-card h2 { font-size: 30px; }
  .tiled-index .blog-card--feature h2 { font-size: 36px; }
  .tiled-index .blog-card-art { height: 255px; }
}

@media (max-width: 760px) {
  body.tiled-index .hero.blog-hero { padding-bottom: 32px; }
  .tiled-index .blog-list-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }
  .tiled-index .blog-card { grid-column: auto; }
  .tiled-index .blog-card--feature .blog-card-link { display: flex; }
  .tiled-index .blog-card--feature .blog-card-art {
    border-right: 0;
    border-bottom: 1px solid var(--rule);
  }
  .tiled-index .blog-card .blog-card-art {
    height: auto;
    aspect-ratio: 1.32;
  }
  .tiled-index .blog-card .blog-card-art img { object-fit: cover; }
  .tiled-index .blog-card .blog-card-copy { padding: 24px; }
  .tiled-index .blog-card h2 { font-size: clamp(29px, 7.5vw, 36px); }
  .tiled-index .article-card-topic { margin-bottom: 14px; }
  .tiled-index .blog-card p { margin-top: 14px; font-size: 14px; }
  .tiled-index .blog-card-arrow {
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .tiled-index .blog-card,
  .tiled-index .blog-card-art img { transition: none; }
}

@media print {
  .tiled-index .blog-card { break-inside: avoid; box-shadow: none; }
  .tiled-index .blog-card-arrow { display: none; }
}