/*
  Research priorities as logo blocks (2 Nov 2026).
  Each area is a solid block in the logo's blue (#194987), square-cornered like the mark.
  The library cell stays an outline, echoing the empty quadrant of the logo.
  On the homepage, research-areas.js places the blocks one by one when the grid scrolls into view.
  Without that script (or with reduced motion) the grid shows its finished state.
*/
.ra-research {
  --ra-ink: #121c3c;
  --ra-slate: #526078;
  --ra-cobalt: #294dc4;
  --ra-paper: #f8f7f2;
  padding: clamp(84px, 9vw, 144px) 0 clamp(88px, 10vw, 150px);
  background: var(--ra-paper);
  color: var(--ra-ink);
}

.ra-research__heading {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(300px, .72fr);
  gap: clamp(32px, 8vw, 136px);
  align-items: end;
}

.ra-research__heading h2 {
  margin: 0;
  color: var(--ra-ink);
  font-family: var(--v2-sans);
  font-size: clamp(40px, 3.9vw, 56px);
  font-weight: 600;
  letter-spacing: -.045em;
  line-height: 1;
}

.ra-research__lede {
  max-width: 420px;
  margin: 0;
  padding-bottom: 6px;
  color: var(--ra-slate);
  font-family: var(--v2-sans);
  font-size: 16px;
  line-height: 1.54;
}

.ra-research .ra-grid { margin-top: clamp(40px, 5vw, 64px); }
.rp-library-priorities .ra-grid { margin-top: clamp(28px, 3vw, 40px); }

/* ---- The grid of blocks ---- */
.ra-grid {
  --ra-block: #194987;
  --ra-block-hover: #1d5aa3;
  --ra-on-block: #fffefa;
  --ra-ink: #121c3c;
  --ra-paper: #f8f7f2;
  --ra-gap: clamp(28px, 3.6vw, 52px); /* the logo's gutter is about 14% of a block's width */
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--ra-gap);
  margin: 0;
  padding: 0;
  list-style: none;
}

.ra-area {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  min-height: 268px;
  padding: 30px 30px 26px;
  color: var(--ra-on-block);
}

/* The block itself is a layer, so it can be placed without moving the text.
   Its surface shares the hero's material: a soft light falling across the logo blue, and the same grain. */
.ra-area::before {
  position: absolute;
  z-index: -1;
  inset: 0;
  background:
    radial-gradient(105% 80% at 100% 0%, rgba(198, 194, 243, .17), transparent 62%),
    radial-gradient(90% 70% at 0% 100%, rgba(139, 183, 225, .12), transparent 66%),
    linear-gradient(168deg, #1b4d8e 0%, var(--ra-block) 48%, #143e77 100%);
  content: "";
  transition: filter .25s ease;
}

.ra-area::after {
  position: absolute;
  z-index: -1;
  inset: 0;
  background: url("../assets/v12-grain.svg") 0 0 / 160px 160px repeat;
  content: "";
  mix-blend-mode: soft-light;
  opacity: .36;
  pointer-events: none;
}

/* The encrypted field (block-cipher.js), between the block and its text. */
.ra-area__cipher {
  position: absolute;
  z-index: -1;
  top: 0;
  left: 0;
  display: block;
  pointer-events: none;
  opacity: .6;
  transition: opacity .25s ease;
}

.ra-area__legacy-anchor { position: absolute; top: 0; left: 0; }

.ra-area__title {
  margin: 0;
  color: inherit;
  font-family: var(--v2-sans, "Manrope", -apple-system, sans-serif);
  font-size: clamp(24px, 2.1vw, 29px);
  font-weight: 600;
  letter-spacing: -.025em;
  line-height: 1.15;
}

.ra-area__link { color: inherit; text-decoration: none; }
.ra-area__link::after { content: ""; position: absolute; inset: 0; }

.ra-area__question {
  max-width: 32ch;
  margin: 12px 0 0;
  color: rgba(255, 254, 250, .88);
  font-family: var(--v2-sans, "Manrope", -apple-system, sans-serif);
  font-size: 16px;
  line-height: 1.5;
}

/* The foot of each block: the paper's reading time, set as quiet numeric metadata, and one arrow. */
.ra-area__meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  margin: auto 0 0;
  padding-top: 28px;
  color: rgba(255, 254, 250, .8);
  font-family: var(--v2-mono, "JetBrains Mono", ui-monospace, monospace);
  font-size: 12px;
  font-weight: 400;
  line-height: 1.4;
}

.ra-area__read {
  display: inline-block;
  color: var(--ra-on-block);
  font-family: var(--v2-sans, "Manrope", -apple-system, sans-serif);
  font-size: 16px;
  line-height: 1;
  transition: transform .18s ease;
}

.ra-area:hover::before { filter: brightness(1.13); }
.ra-area:hover .ra-area__cipher { opacity: .85; }
.ra-area:hover .ra-area__read { transform: translateX(3px); }

.ra-area__link:focus-visible { outline: none; }
.ra-area__link:focus-visible::after { outline: 2px solid var(--ra-on-block); outline-offset: -6px; }

/* The closing cell is the logo's empty quadrant: an outline, not a block. */
.ra-area--closing { color: var(--ra-ink); }
.ra-area--closing::before { background: transparent; box-shadow: inset 0 0 0 1px rgba(25, 73, 135, .38); }
.ra-area--closing::after { display: none; }
.ra-area--closing .ra-area__question { color: #526078; }
.ra-area--closing .ra-area__meta { color: #526078; }
.ra-area--closing .ra-area__read { color: var(--ra-block); }
.ra-area--closing:has(.ra-area__link):hover::before { background: rgba(25, 73, 135, .05); filter: none; }
.ra-area--closing .ra-area__link:focus-visible::after { outline-color: var(--ra-block); }
.ra-area--closing:not(:has(.ra-area__link)):hover::before { background: transparent; }

/* Optional small diagrams (off by default). */
.ra-area__glyph { display: block; width: min(100%, 196px); height: 72px; margin-bottom: 36px; }
.ra-area__glyph img { display: block; width: 100%; height: 100%; object-fit: contain; object-position: left center; filter: invert(1) brightness(2); }

/* ---- Placing the blocks (homepage, set up by research-areas.js) ---- */
.ra-grid.is-waiting .ra-area { box-shadow: inset 0 0 0 1px rgba(25, 73, 135, .16); }
.ra-grid.is-waiting .ra-area::before,
.ra-grid.is-waiting .ra-area::after { opacity: 0; transform: translateY(-28px) scale(.965); }
.ra-grid.is-waiting .ra-area > :not(.ra-area__legacy-anchor) { opacity: 0; transform: translateY(6px); }

.ra-grid.is-placing .ra-area::before,
.ra-grid.is-placing .ra-area::after {
  transition: opacity .32s ease calc(var(--i, 0) * 130ms), transform .62s cubic-bezier(.16, 1, .3, 1) calc(var(--i, 0) * 130ms), filter .25s ease;
}
.ra-grid.is-placing .ra-area > :not(.ra-area__legacy-anchor) {
  transition: opacity .42s ease calc(var(--i, 0) * 130ms + 300ms), transform .5s cubic-bezier(.16, 1, .3, 1) calc(var(--i, 0) * 130ms + 300ms);
}
.ra-grid.is-placing .ra-area { transition: box-shadow .3s ease calc(var(--i, 0) * 130ms + 260ms); }

/* Desktop: blocks take the logo's own proportions (395 × 434). */
@media (min-width: 1025px) {
  .ra-area { min-height: 0; aspect-ratio: 395 / 434; }
}

@media (max-width: 1024px) {
  .ra-grid { --ra-gap: 24px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ra-area { min-height: 280px; }
}

@media (max-width: 900px) {
  .ra-research__heading { grid-template-columns: 1fr; gap: 20px; }
}

@media (max-width: 620px) {
  .ra-research { padding-block: 72px 82px; }
  .ra-research__heading h2 { font-size: clamp(36px, 10vw, 44px); }
  .ra-grid { --ra-gap: 12px; grid-template-columns: 1fr; }
  .ra-area { min-height: 256px; padding: 24px 22px 22px; } /* room for the encrypted field */
  .ra-area--closing:not(:has(.ra-area__meta)) { min-height: 0; } /* a note with no link needs no empty foot */
  .ra-area__title { font-size: 24px; }
  .ra-area__meta { padding-top: 22px; }
}

@media (prefers-reduced-motion: reduce) {
  .ra-area::before, .ra-area__read, .ra-area__cipher { transition: none; }
}