/* Homepage-only layout. Palette and hero gradient match the research hubs.
   Kept separate from main.css so this release cannot restyle research pages. */
:root {
  color-scheme: dark;
  --cs-bg: #050816;
  --cs-surface: #0b1020;
  --cs-accent: #38bdf8;
  --cs-text-main: #e5e7eb;
  --cs-text-muted: #b4bdce;
  --cs-heading: #f9fafb;
  --cs-border: #29354b;
  --cs-eyebrow: #c7d2fe;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 1rem; }
body.cs-home {
  margin: 0;
  background: radial-gradient(circle at top, #020617 0, #020617 35%, #000 100%);
  color: var(--cs-text-main);
  font: 17px/1.65 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
a { color: inherit; text-underline-offset: .25em; }
a:hover { color: var(--cs-accent); }
a:focus-visible, summary:focus-visible { outline: 3px solid #facc15; outline-offset: 5px; }
.skip { position: absolute; top: -100px; left: 16px; z-index: 5; background: var(--cs-accent); color: #050816; padding: 12px; }
.skip:focus { top: 12px; }
.shell { max-width: 1224px; margin: auto; padding: 0 32px; }
.site-header { display: flex; justify-content: space-between; gap: 24px; align-items: center; padding: 27px 0; }
.brand { font-weight: 800; font-size: 28px; letter-spacing: -.06em; text-decoration: none; white-space: nowrap; }
.brand span { color: var(--cs-accent); }
.brand-group { line-height: 1.3; }
.logo-caption { margin: 3px 0 0; font-size: 11px; letter-spacing: .09em; text-transform: uppercase; color: #b4c4dc; }
.site-nav { display: flex; gap: 28px; flex-wrap: wrap; font-size: 14px; font-weight: 650; }
.site-nav a { text-decoration: none; padding: 9px 0; }
.site-nav a:hover { text-decoration: underline; }
.eyebrow { font-size: 12px; text-transform: uppercase; letter-spacing: .15em; font-weight: 750; color: var(--cs-eyebrow); margin: 0 0 16px; }
.hero {
  position: relative;
  overflow: hidden;
  padding: 45px 38px 47px;
  background: radial-gradient(circle at top left, #1d4ed8, #020617 65%);
  border-radius: 24px;
  box-shadow: 0 18px 45px rgba(15, 23, 42, .55), 0 0 0 1px rgba(148, 163, 184, .35);
}
.hero::before {
  content: ""; position: absolute; inset: -40%; pointer-events: none;
  background: radial-gradient(circle at 0 0, rgba(56, 189, 248, .2), transparent 60%), radial-gradient(circle at 100% 0, rgba(129, 140, 248, .2), transparent 55%);
  opacity: .65;
}
.hero > * { position: relative; z-index: 1; }
.hero-grid { display: grid; grid-template-columns: 1.35fr 1fr; gap: 38px; align-items: center; }
.hero-grid > * { min-width: 0; }
h1 { font-size: clamp(42px, 4.25vw, 58px); line-height: 1.1; letter-spacing: -.055em; font-weight: 790; margin: 0; color: var(--cs-heading); }
h1 .accent { color: #7dd3fc; }
.hero-copy { color: #e0e8f6; font-size: 17px; margin: 0 0 20px; max-width: 39ch; }
.hero-question { color: #f9fafb; font-weight: 700; font-size: 21px; line-height: 1.4; margin: 0 0 22px; }
.hero-actions { display: flex; gap: 15px; flex-wrap: wrap; align-items: center; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 9px; text-decoration: none; min-height: 48px; padding: 12px 19px; background: var(--cs-accent); border: 1px solid var(--cs-accent); color: #050816; font-size: 14px; font-weight: 800; border-radius: 6px; }
.button:hover { background: #aee6ff; color: #050816; }
.text-link { font-size: 14px; font-weight: 700; color: #7dd3fc; padding: 9px 0; }
.principles { display: flex; gap: 16px; justify-content: space-between; flex-wrap: wrap; padding: 24px 0; border-bottom: 1px solid var(--cs-border); font-size: 12px; color: #bac8de; text-transform: uppercase; letter-spacing: .09em; }
.principles strong { color: var(--cs-text-main); }
.section { padding-top: 43px; }
.section-heading { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 24px; }
.section-heading h2 { font-size: 31px; line-height: 1.18; letter-spacing: -.035em; margin: 0; color: var(--cs-heading); }
.section-heading > p { max-width: 39ch; font-size: 14px; color: var(--cs-text-muted); margin: 0; }
.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.research-card { position: relative; display: flex; flex-direction: column; padding: 26px 28px 21px; border: 1px solid var(--cs-border); border-radius: 16px; background: radial-gradient(circle at top left, #111827, #020617 85%); min-width: 0; transition: border-color .18s ease; }
.research-card:hover, .research-card:focus-within { border-color: #4b83b0; }
.card-top { display: flex; align-items: start; justify-content: space-between; gap: 15px; margin-bottom: 17px; }
.card-number { font-size: 13px; color: var(--cs-accent); font-weight: 800; font-variant-numeric: tabular-nums; }
.card-lens { font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--cs-text-muted); text-align: right; }
.research-card h3 { font-size: 23px; line-height: 1.23; letter-spacing: -.027em; margin: 0 0 13px; color: var(--cs-heading); }
.research-card p { color: #bdc9dc; font-size: 15px; margin: 0 0 17px; max-width: 53ch; }
.card-link { font-weight: 750; font-size: 14px; color: var(--cs-accent); margin-top: auto; text-decoration: none; min-height: 44px; display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.card-link:hover { text-decoration: underline; }
.value-panel { margin-top: 43px; padding: 30px; border: 1px solid var(--cs-border); border-radius: 16px; background: linear-gradient(120deg, #0c1830, var(--cs-surface)); }
.value-panel h2 { font-size: 28px; line-height: 1.2; letter-spacing: -.03em; margin: 0 0 12px; color: var(--cs-heading); }
.value-intro { max-width: 90ch; color: #c3cee0; font-size: 15px; margin: 0 0 24px; }
.value-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; }
.value-grid h3 { font-size: 16px; color: #f9fafb; margin: 0 0 7px; }
.value-grid p { font-size: 13px; color: #b7c5d9; margin: 0; }
.evidence-note { font-size: 12px; color: #afbed4; border-top: 1px solid #293a55; margin: 24px 0 0; padding-top: 17px; }
.qa-panel { display: grid; grid-template-columns: .85fr 1.15fr; gap: 36px; padding: 43px 0 0; }
.qa-panel > * { min-width: 0; }
.qa-panel h2 { font-size: 29px; line-height: 1.2; letter-spacing: -.03em; margin: 0 0 13px; color: var(--cs-heading); }
.qa-panel .intro { font-size: 15px; color: #bac8dc; margin: 0; }
.qa-panel details { border-bottom: 1px solid var(--cs-border); padding: 17px 0; }
.qa-panel details:first-child { padding-top: 0; }
.qa-panel summary { cursor: pointer; font-size: 15px; font-weight: 700; color: #e5e7eb; padding: 5px 0; }
.qa-panel details p { font-size: 14px; color: #b9c7db; margin: 14px 0 0; }
.site-footer { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 18px; margin-top: 43px; padding: 24px 0 32px; border-top: 1px solid var(--cs-border); font-size: 12px; color: var(--cs-text-muted); }
.site-footer p { margin: 4px 0 0; }
.site-footer a { color: var(--cs-accent); padding: 8px 0; }
.footer-links { display: flex; gap: 22px; flex-wrap: wrap; }
@media (max-width: 1000px) {
  .hero-grid { grid-template-columns: 1fr; gap: 27px; }
  .hero-copy { max-width: 70ch; }
  .hero-question { font-size: 20px; }
  .value-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .qa-panel { grid-template-columns: 1fr; gap: 22px; }
}
@media (max-width: 760px) {
  .section-heading { display: block; }
  .section-heading > p { margin-top: 12px; max-width: 60ch; }
  .site-header { align-items: start; gap: 17px; flex-direction: column; }
  .site-nav { gap: 22px; font-size: 13px; }
  .principles { justify-content: flex-start; gap: 12px 22px; }
}
@media (max-width: 580px) {
  .shell { padding-left: 20px; padding-right: 20px; }
  .site-header { padding-top: 20px; padding-bottom: 20px; }
  .hero { padding: 28px 23px 30px; border-radius: 18px; }
  h1 { font-size: clamp(30px, 8.7vw, 46px); }
  .hero .eyebrow { font-size: 10px; letter-spacing: .12em; }
  .hero-copy { font-size: 16px; }
  .cards { grid-template-columns: 1fr; }
  .research-card { padding: 23px 23px 18px; }
  .research-card h3 { font-size: 22px; }
  .section-heading h2 { font-size: 27px; }
  .section { padding-top: 32px; }
  .value-panel { padding: 23px; margin-top: 32px; }
  .value-grid { gap: 20px; }
  .value-panel h2 { font-size: 26px; }
  .principles { font-size: 10px; }
  .site-footer { align-items: start; flex-direction: column; }
}
@media (max-width: 360px) {
  .shell { padding-left: 14px; padding-right: 14px; }
  .hero { padding-left: 18px; padding-right: 18px; }
  .site-nav { gap: 16px; font-size: 12px; }
  .value-grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}
@media print {
  :root { color-scheme: light; }
  body.cs-home { background: white; color: black; font-size: 11pt; }
  .shell { max-width: none; padding: 0; }
  .site-nav, .hero-actions, .skip { display: none; }
  .hero, .research-card, .value-panel { background: white; box-shadow: none; border: 1px solid #aaa; break-inside: avoid; }
  .hero::before { display: none; }
  .hero { padding: 20px; }
  .hero-grid { grid-template-columns: 1fr; gap: 20px; }
  h1 { font-size: 28pt; }
  .cards { grid-template-columns: 1fr 1fr; }
  .research-card, .value-panel { padding: 18px; }
  .value-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .qa-panel { grid-template-columns: 1fr; }
  .cs-home * { color: black !important; }
  .cs-home a { text-decoration: underline; }
}