:root {
  color-scheme: light dark;
  --hub-bg: #f5f8fc;
  --hub-surface: #ffffff;
  --hub-surface-soft: #edf5fb;
  --hub-text: #162134;
  --hub-muted: #5e6b7d;
  --hub-line: #dbe4ed;
  --hub-blue: #087ea4;
  --hub-blue-deep: #075d7c;
  --hub-navy: #07172c;
  --hub-cyan: #8ee6fa;
  --hub-shadow: 0 18px 54px rgba(7, 23, 44, .1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--hub-bg);
  color: var(--hub-text);
  font-family: "Mona Sans", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
a:focus-visible { outline: 3px solid #f5a623; outline-offset: 4px; border-radius: 4px; }

.skip-link { position: absolute; left: -9999px; top: 12px; }
.skip-link:focus {
  left: 12px;
  z-index: 50;
  padding: .7rem 1rem;
  border-radius: 8px;
  background: var(--hub-surface);
  color: var(--hub-text);
}

.hub-shell {
  width: min(1120px, 92vw);
  margin-inline: auto;
}

.hub-hero {
  overflow: hidden;
  background:
    radial-gradient(circle at 84% 14%, rgba(142, 230, 250, .16), transparent 30%),
    linear-gradient(135deg, #07172c 0%, #0a334a 58%, #0b6076 100%);
  color: #ffffff;
}

.hub-hero__inner {
  padding: clamp(76px, 10vw, 128px) 0 clamp(80px, 10vw, 118px);
}

.eyebrow,
.section-kicker,
.card-kicker {
  margin: 0;
  color: var(--hub-blue-deep);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .11em;
  text-transform: uppercase;
}

.hub-hero .eyebrow { color: var(--hub-cyan); }

.hub-hero h1 {
  max-width: 900px;
  margin: 17px 0 22px;
  font-size: clamp(2.8rem, 7vw, 5.8rem);
  font-weight: 600;
  letter-spacing: -.05em;
  line-height: .98;
}

.dek {
  max-width: 790px;
  margin: 0;
  color: #d7e7ef;
  font-size: clamp(1.08rem, 2.4vw, 1.38rem);
  line-height: 1.58;
}

.featured {
  position: relative;
  z-index: 2;
  margin-top: clamp(-42px, -4vw, -28px);
  padding: clamp(28px, 5vw, 52px);
  border: 1px solid var(--hub-line);
  border-radius: 24px;
  background: var(--hub-surface);
  box-shadow: var(--hub-shadow);
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 26px;
}

.section-heading--stack {
  display: block;
  max-width: 820px;
}

.section-heading h2,
.research-principles h2 {
  margin: 6px 0 0;
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 600;
  letter-spacing: -.035em;
  line-height: 1.1;
}

.section-heading--stack > p:last-child {
  margin: 14px 0 0;
  color: var(--hub-muted);
  font-size: 1.05rem;
}

.read-time {
  flex: none;
  color: var(--hub-muted);
  font-size: .92rem;
  white-space: nowrap;
}

.featured-card {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, .9fr);
  overflow: hidden;
  border: 1px solid var(--hub-line);
  border-radius: 19px;
  background: var(--hub-bg);
  text-decoration: none;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.featured-card:hover,
.featured-card:focus-visible {
  border-color: #99cbd9;
  box-shadow: 0 14px 42px rgba(7, 23, 44, .1);
  transform: translateY(-2px);
}

.featured-card__media {
  position: relative;
  min-height: 360px;
  overflow: hidden;
  background: #07172c;
}

.featured-card__media img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}


.featured-card__copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(26px, 4vw, 46px);
}

.card-kicker { color: var(--hub-blue-deep); }

.featured-card h3 {
  margin: 10px 0 16px;
  font-size: clamp(1.75rem, 3.2vw, 2.65rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -.035em;
}

.featured-card__copy > p:not(.card-kicker) {
  margin: 0;
  color: var(--hub-muted);
}

.read-link,
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--hub-blue-deep);
  font-weight: 700;
  text-decoration: none;
}

.read-link { margin-top: 22px; }

.library {
  padding: clamp(82px, 10vw, 122px) 0;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  margin-top: 34px;
}

.article-card {
  overflow: hidden;
  border: 1px solid var(--hub-line);
  border-radius: 18px;
  background: var(--hub-surface);
  box-shadow: 0 10px 34px rgba(7, 23, 44, .055);
}

.article-card__media {
  display: block;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #0b2336;
}

.article-card__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .24s ease;
}

.article-card:hover .article-card__media img { transform: scale(1.018); }

.article-card__body { padding: 24px 25px 27px; }

.card-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 18px;
  margin: 0 0 12px;
  color: var(--hub-muted);
  font-size: .78rem;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.article-card h3 {
  margin: 0;
  font-size: clamp(1.3rem, 2.5vw, 1.75rem);
  line-height: 1.18;
  letter-spacing: -.02em;
}

.article-card h3 a { text-decoration: none; }

.article-card__body > p:not(.card-meta) {
  margin: 14px 0 19px;
  color: var(--hub-muted);
}

.research-principles {
  margin-bottom: clamp(72px, 10vw, 118px);
  padding: clamp(28px, 5vw, 52px);
  border: 1px solid var(--hub-line);
  border-radius: 22px;
  background: var(--hub-surface-soft);
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin: 28px 0;
}

.principle-grid p {
  margin: 0;
  padding: 20px;
  border: 1px solid var(--hub-line);
  border-radius: 14px;
  background: var(--hub-surface);
  color: var(--hub-muted);
}

.principle-grid strong {
  display: block;
  margin-bottom: 6px;
  color: var(--hub-text);
}

@media (max-width: 850px) {
  .featured-card { grid-template-columns: 1fr; }
  .featured-card__media { min-height: 0; aspect-ratio: 16 / 9; }
  .principle-grid { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  .hub-shell { width: min(100% - 28px, 1120px); }
  .hub-hero__inner { padding-top: 62px; padding-bottom: 80px; }
  .section-heading { display: block; }
  .read-time { display: inline-block; margin-top: 8px; }
  .article-grid { grid-template-columns: 1fr; }
  .featured { padding: 18px; border-radius: 18px; }
  .featured-card__copy,
  .article-card__body { padding: 21px; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --hub-bg: #08111f;
    --hub-surface: #101c2c;
    --hub-surface-soft: #102534;
    --hub-text: #e8eef6;
    --hub-muted: #b0bed0;
    --hub-line: #28384b;
    --hub-blue: #61d3ed;
    --hub-blue-deep: #61d3ed;
    --hub-shadow: 0 18px 54px rgba(0, 0, 0, .28);
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}