/* BLURSOR's design system for redesigned pages: colour, type, space and the
   shared components from references/redesign-2026-10/briefs/style.md.
   The header and footer live in site-shell.css, which every page loads. */

:root {
  --bl-page: #eeeae4;
  --bl-field: #f0e9e4;
  --bl-panel: #f6f2ee;
  --bl-paper: #fffdfa;
  --bl-sand: #e6e0d9;
  --bl-stone: #d9d0c8;
  --bl-ink: #1e1a17;
  --bl-ink-on: #f6f1ec;
  --bl-muted: #625952;
  --bl-quiet: #5e554f;
  --bl-rule: #cdc3ba;
  --bl-rule-light: #ddd4cc;
  --bl-outline: #b3a89f;
  --bl-underline: #a39890;
  --bl-black: #141210;
  --bl-black-text: #f3eee9;
  --bl-black-muted: #c9c0b8;
  --bl-accent: #b73524;
  --bl-font: 'Hanken Grotesk', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --bl-side: 5.5%;
  --bl-section: clamp(96px, 9vw, 160px);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  /* Anchors and scrolled-to panels land below the sticky header. */
  scroll-padding-top: 88px;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

@media (max-width: 759px) {
  html {
    scroll-padding-top: 72px;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bl-page);
  color: var(--bl-ink);
  font-family: var(--bl-font);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4,
p,
ol,
ul,
figure,
blockquote {
  margin: 0;
}

h1,
h2,
h3,
h4 {
  font-size: inherit;
  font-weight: inherit;
}

ol,
ul {
  padding: 0;
  list-style: none;
}

img,
video,
svg {
  display: block;
}

a {
  color: var(--bl-ink);
  text-decoration: none;
}

a:hover {
  color: var(--bl-ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: .25em;
}

button {
  font: inherit;
}

:focus-visible {
  outline: 2px solid var(--bl-ink);
  outline-offset: 3px;
}

::selection {
  background: rgba(183, 53, 36, .2);
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* Eyebrow, heading, text */
.eyebrow {
  font-size: 13px;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.section-title {
  font-size: clamp(26px, 2.1vw, 36px);
  font-weight: 300;
  line-height: 1.15;
}

.subhead {
  font-size: clamp(22px, 1.75vw, 28px);
  font-weight: 400;
  line-height: 1.2;
}

/* Arrow link: a thin 17×10 arrow, then the text */
.arrow,
.arrow-link svg {
  flex: none;
  width: 17px;
  height: 10px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.2;
}

.arrow-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.3;
}

/* Outline button: fills with ink on hover */
.button-outline {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  height: 48px;
  margin: 0;
  padding: 0 20px;
  border: 1px solid var(--bl-ink);
  border-radius: 0;
  background: transparent;
  color: var(--bl-ink);
  font-size: 15px;
  font-weight: 500;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
}

.button-outline:hover {
  background: var(--bl-ink);
  color: var(--bl-ink-on);
  text-decoration: none;
}

.button-outline--plain {
  padding: 0 18px;
  font-weight: 400;
}

/* Underlined text link */
.text-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 15px;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: var(--bl-underline);
  text-underline-offset: .25em;
}

.text-link:hover {
  text-decoration-color: var(--bl-ink);
}

/* Placeholders: an art slot waiting for its still, and wording still to come */
.art-slot {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px;
  background: rgba(127, 127, 127, .08);
  color: var(--bl-ink);
  font-size: 13px;
  line-height: 1.3;
  text-align: center;
}

.art-slot::before {
  content: '';
  position: absolute;
  inset: 0;
  border: 1.5px dashed currentColor;
  opacity: .35;
  pointer-events: none;
}

.art-slot svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  opacity: .45;
}

.art-slot span {
  max-width: 90%;
  font-weight: 500;
  letter-spacing: .01em;
  opacity: .75;
}

.to-confirm {
  color: var(--bl-accent);
  font-size: 14px;
}

/* Solid button with glare: ink fill, a pale sheen crossing every few seconds
   and a slow edge pulse. It holds still for reduced motion. */
.button-glare {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  max-width: 100%;
  min-height: 56px;
  padding: 0 24px;
  overflow: hidden;
  border: 0;
  background: var(--bl-ink);
  box-shadow: 0 0 0 1px rgba(246, 241, 236, .06) inset;
  color: var(--bl-ink-on);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.25;
  text-align: center;
  cursor: pointer;
  transition: background .35s ease, transform .35s ease, box-shadow .35s ease;
}

.button-glare:hover {
  background: #2b2521;
  box-shadow: 0 0 0 1px rgba(246, 241, 236, .14) inset, 0 14px 30px -18px rgba(20, 18, 16, .7);
  color: var(--bl-ink-on);
  text-decoration: none;
  transform: translateY(-1px);
}

.button-glare > * {
  position: relative;
  z-index: 1;
}

.button-glare::before,
.button-glare::after {
  content: '';
  position: absolute;
  pointer-events: none;
}

.button-glare::before {
  top: 0;
  right: 0;
  bottom: 0;
  width: 34%;
  background: linear-gradient(90deg, rgba(246, 241, 236, 0) 0%, rgba(246, 241, 236, .11) 100%);
  animation: bl-edge 4.8s ease-in-out infinite;
  transition: background .4s ease;
}

.button-glare:hover::before {
  background: linear-gradient(90deg, rgba(246, 241, 236, 0) 0%, rgba(246, 241, 236, .2) 100%);
  animation-duration: 1.6s;
}

.button-glare::after {
  top: -10%;
  bottom: -10%;
  left: 0;
  width: 28%;
  background: linear-gradient(90deg, rgba(255, 250, 242, 0) 0%, rgba(255, 250, 242, .2) 50%, rgba(255, 250, 242, 0) 100%);
  transform: translateX(-160%) skewX(-18deg);
  animation: bl-glare 5.6s cubic-bezier(.4, 0, .2, 1) 1.2s infinite;
}

.button-glare:hover::after {
  background: linear-gradient(90deg, rgba(255, 250, 242, 0) 0%, rgba(255, 250, 242, .3) 50%, rgba(255, 250, 242, 0) 100%);
  animation: bl-glare-hover 1.15s cubic-bezier(.4, 0, .2, 1) infinite;
}

.button-glare svg {
  flex: none;
  width: 17px;
  height: 10px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.2;
}

@keyframes bl-glare {
  0% { transform: translateX(-160%) skewX(-18deg); }
  28% { transform: translateX(420%) skewX(-18deg); }
  100% { transform: translateX(420%) skewX(-18deg); }
}

@keyframes bl-glare-hover {
  0% { transform: translateX(-160%) skewX(-18deg); }
  100% { transform: translateX(420%) skewX(-18deg); }
}

@keyframes bl-edge {
  0%, 100% { opacity: .55; }
  50% { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .button-glare,
  .button-glare:hover {
    transform: none;
    transition: none;
  }

  .button-glare::before,
  .button-glare:hover::before {
    animation: none;
  }

  .button-glare::after {
    display: none;
  }
}

/* "Read it as text": an explainer's story as prose, opened from a link near
   its launcher and shown in full without JavaScript. */
.text-version {
  flex: 1 1 100%;
  margin-top: clamp(40px, 4vw, 72px);
}

.shell-js .text-version:not(.is-open) {
  display: none;
}

.text-version__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px 32px;
}

.text-version__head .subhead {
  margin-top: 14px;
}

.text-version__close {
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--bl-ink);
  cursor: pointer;
}

html:not(.shell-js) .text-version__close {
  display: none;
}

.text-version__list {
  margin-top: 28px;
  border-top: 1px solid var(--bl-rule);
}

.text-version__item {
  display: flex;
  flex-wrap: wrap;
  column-gap: 4vw;
  row-gap: 10px;
  padding: 30px 0;
  border-bottom: 1px solid var(--bl-rule);
}

.text-version__item h4 {
  flex: 0 0 22%;
  min-width: 12em;
  font-size: clamp(19px, 1.43vw, 24px);
  font-weight: 400;
  line-height: 1.3;
}

.text-version__words {
  flex: 1 1 28em;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.6;
}

.text-version__words > * + * {
  margin-top: 12px;
}

.text-version__words ul {
  padding-left: 1.2em;
  list-style: disc;
}

.text-version__words li + li {
  margin-top: 4px;
}

.text-version__research {
  color: var(--bl-muted);
  font-size: 14px;
  line-height: 1.5;
}

.text-version__research a {
  color: var(--bl-muted);
  text-decoration: underline;
  text-decoration-color: var(--bl-underline);
  text-underline-offset: .2em;
}

.text-version__links {
  display: flex;
  flex-wrap: wrap;
  column-gap: 28px;
}

.text-version__note {
  color: var(--bl-muted);
  font-size: 14px;
  font-style: italic;
}

/* Page opening on the warm field, fading into the page below it */
.page-top {
  position: relative;
  background: var(--bl-field);
}

.page-top::after {
  content: '';
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 48px;
  background: linear-gradient(to bottom, rgba(238, 234, 228, 0), var(--bl-page));
  pointer-events: none;
}

/* Research cards: the research page's latest digests and an article's
   "Keep reading". */
.research-card {
  min-width: 0;
}

.research-card__art {
  position: relative;
  display: block;
  aspect-ratio: 3 / 2;
}

/* On short screens the drawing takes its size from the screen's height, so
   the heading above and the card's words below fit with it. */
@media (min-width: 760px) {
  .research-card__art {
    width: min(100%, max(240px, calc((100svh - 427px) * 1.5)));
  }
}

.research-card__art img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.research-card__art:hover {
  text-decoration: none;
}

.research-card__topic {
  margin-top: 32px;
}

.research-card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px 32px;
  margin-top: 18px;
}

.research-card--related .research-card__head {
  margin-top: 28px;
}

.research-card__title {
  flex: 1 1 16em;
  max-width: 19em;
  font-size: clamp(20px, 1.56vw, 26px);
  font-weight: 400;
  line-height: 1.25;
  text-wrap: pretty;
}

.research-card__meta {
  flex: 0 0 auto;
  margin-top: .2em;
  font-size: 15px;
  line-height: 1.45;
}

.research-card__meta a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: var(--bl-underline);
  text-underline-offset: .25em;
  overflow-wrap: anywhere;
}

.research-card__summary {
  max-width: 34em;
  margin-top: 14px;
  color: var(--bl-muted);
  font-size: 16px;
  line-height: 1.5;
  text-wrap: pretty;
}

.research-card .arrow-link {
  margin-top: 14px;
}

@media (min-width: 1300px) {
  .research-card__meta {
    margin-left: auto;
    text-align: right;
  }
}