/* Bank of America x Eduba landing page
   Palette: #E61030 primary red, #012169 navy, #0065B3 link, #F4F4F4 panel, #1C1C1C near-black
   Typography: Connections with Arial/Helvetica fallback stack (native to BofA) */

:root {
  --red: #E61030;
  --navy: #012169;
  --link: #0065B3;
  --ink: #1C1C1C;
  --panel: #F4F4F4;
  --rule: #E3E5EA;
  --body: #333333;
  --bg: #FFFFFF;
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  --shadow-sub: 0 1px 2px rgba(0,0,0,0.06);
  --shadow-med: 0 4px 12px rgba(0,0,0,0.10);
  --unit: 8px;
  --section: 64px;
  --max: 1120px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: 'Connections', Arial, Helvetica, system-ui, sans-serif;
  font-weight: 400;
  color: var(--body);
  background: var(--bg);
  line-height: 1.55;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

/* Flagscape stripe: thin navy/red horizontal rules as a BofA echo */
.flag-stripes {
  height: 6px;
  display: flex;
  width: 100%;
}
.flag-stripes span:first-child { background: var(--navy); flex: 1; }
.flag-stripes span:last-child  { background: var(--red);  flex: 1; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
}
.site-header__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.site-header__logo {
  display: inline-flex;
  align-items: center;
}
.site-header__logo img {
  height: 28px;
  width: auto;
  display: block;
}
.site-header__meta {
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--navy);
  font-weight: 600;
}
.site-header__meta .sep {
  color: var(--rule);
  padding: 0 10px;
}

/* Hero */
.hero {
  padding: 72px 24px 56px;
  background: var(--bg);
}
.hero__inner {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}
.eyebrow {
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--navy);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.eyebrow::before {
  content: "";
  display: inline-block;
  width: 28px;
  height: 2px;
  background: var(--red);
}

h1.hero__title {
  font-family: 'Connections', Arial, Helvetica, sans-serif;
  font-weight: 700;
  font-size: clamp(34px, 5.2vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.015em;
  color: var(--navy);
  margin: 18px 0 0;
  max-width: 18ch;
}
.hero__title .accent { color: var(--red); }

.hero__lede {
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.55;
  color: var(--ink);
  max-width: 60ch;
  margin: 24px 0 0;
}

.hero__meta-row {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  font-size: 13px;
  color: var(--navy);
  letter-spacing: 0.02em;
}
.hero__meta-row .chip {
  border: 1px solid var(--rule);
  padding: 6px 10px;
  border-radius: var(--radius-md);
  background: var(--bg);
  font-weight: 600;
}

/* Section chrome */
section {
  padding: var(--section) 24px;
  border-top: 1px solid var(--rule);
}
.section-inner {
  max-width: var(--max);
  margin: 0 auto;
}
.section-eyebrow {
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--red);
  margin: 0 0 14px;
}
h2 {
  font-family: 'Connections', Arial, Helvetica, sans-serif;
  font-weight: 700;
  font-size: clamp(26px, 3vw, 36px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--navy);
  margin: 0 0 20px;
  max-width: 28ch;
}
h3 {
  font-family: 'Connections', Arial, Helvetica, sans-serif;
  font-weight: 700;
  font-size: 18px;
  line-height: 1.3;
  color: var(--navy);
  margin: 0 0 8px;
  letter-spacing: -0.005em;
}
p { margin: 0 0 14px; }
p:last-child { margin-bottom: 0; }

a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
}
a:hover { color: var(--navy); }

/* Read / context grid */
.read-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}
@media (min-width: 860px) {
  .read-grid { grid-template-columns: 0.9fr 1.3fr; gap: 56px; }
}

.pullquote {
  border-left: 3px solid var(--red);
  padding: 6px 0 6px 18px;
  font-size: 17px;
  color: var(--ink);
  line-height: 1.5;
  margin: 0 0 18px;
}
.pullquote strong { color: var(--navy); }

/* Priority strip (Gopalkrishnan's four) */
.priority-strip {
  background: var(--panel);
}
.priority-strip .section-inner { padding: 0; }
.priority-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  overflow: hidden;
}
@media (min-width: 860px) {
  .priority-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
.priority-cell {
  background: var(--bg);
  padding: 24px 22px 26px;
  position: relative;
}
.priority-cell .num {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--red);
  font-weight: 700;
  margin-bottom: 10px;
  display: block;
}
.priority-cell h3 { margin-bottom: 6px; font-size: 16px; }
.priority-cell p { font-size: 14px; color: var(--body); line-height: 1.5; }

/* Framework callout */
.framework {
  background: var(--navy);
  color: #ffffff;
}
.framework h2 { color: #ffffff; max-width: 30ch; }
.framework .section-eyebrow { color: #F4B6C0; }
.framework p { color: rgba(255,255,255,0.86); max-width: 68ch; }
.framework .split-nums {
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 1px;
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--radius-md);
  margin-top: 32px;
  overflow: hidden;
}
.framework .split-nums > div {
  background: var(--navy);
  padding: 22px 20px;
}
.framework .split-nums .pct {
  font-family: 'Connections', Arial, Helvetica, sans-serif;
  font-size: 48px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: #ffffff;
}
.framework .split-nums .pct.red { color: var(--red); }
.framework .split-nums .label {
  margin-top: 10px;
  font-size: 14px;
  color: rgba(255,255,255,0.8);
  line-height: 1.45;
}

/* Evidence / case study */
.evidence-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}
@media (min-width: 760px) {
  .evidence-row { grid-template-columns: repeat(3, minmax(0,1fr)); }
}
.stat {
  border-top: 3px solid var(--red);
  padding: 18px 4px 6px;
}
.stat .num {
  font-size: 40px;
  font-weight: 700;
  color: var(--navy);
  line-height: 1;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}
.stat .desc {
  margin-top: 10px;
  font-size: 14px;
  color: var(--body);
  line-height: 1.5;
}

/* Methodology / paper */
.paper-card {
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  padding: 28px;
  display: grid;
  gap: 12px;
}
.paper-card .paper-label {
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--red);
  font-weight: 700;
}
.paper-card .paper-title {
  font-size: 20px;
  color: var(--navy);
  font-weight: 700;
  line-height: 1.3;
}
.paper-card p { font-size: 15px; color: var(--body); }
.paper-links {
  margin-top: 6px;
  font-size: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
}

/* About Eduba row */
.about-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}
@media (min-width: 760px) {
  .about-row { grid-template-columns: 1.1fr 0.9fr; gap: 48px; }
}
.about-row p { font-size: 16px; color: var(--body); }

/* CTA */
.cta {
  background: var(--bg);
}
.cta-card {
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  background: var(--bg);
  padding: 36px 28px;
  display: grid;
  gap: 14px;
  box-shadow: var(--shadow-sub);
}
@media (min-width: 760px) {
  .cta-card {
    grid-template-columns: 1.3fr 1fr;
    align-items: center;
    padding: 44px 40px;
    gap: 40px;
  }
}
.cta-card h2 { margin: 0; }
.cta-card p { color: var(--body); font-size: 16px; }
.cta-meta {
  font-size: 13px;
  color: var(--navy);
  letter-spacing: 0.04em;
  margin-top: 4px;
}
.cta-btn-wrap { display: flex; flex-direction: column; gap: 10px; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--red);
  color: #ffffff;
  font-weight: 700;
  text-decoration: none;
  padding: 16px 22px;
  border-radius: var(--radius-md);
  font-size: 16px;
  letter-spacing: 0.01em;
  min-height: 48px;
  transition: background-color 150ms ease-out, transform 150ms ease-out;
}
.btn-primary:hover { background: #c40d29; color: #ffffff; }
.btn-primary:active { transform: translateY(1px); }
.btn-primary:focus-visible {
  outline: 3px solid var(--navy);
  outline-offset: 2px;
}
.btn-secondary-link {
  font-size: 14px;
  color: var(--navy);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Footer */
footer {
  border-top: 1px solid var(--rule);
  background: var(--panel);
  padding: 32px 24px;
  font-size: 13px;
  color: #555;
}
footer .section-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  justify-content: space-between;
  align-items: center;
}
footer a { color: var(--navy); }
footer .disclosure { max-width: 58ch; line-height: 1.5; }

/* Utility */
.note {
  font-size: 13px;
  color: #555;
  letter-spacing: 0.01em;
}

/* Mobile tuning */
@media (max-width: 480px) {
  section { padding: 48px 20px; }
  .hero { padding: 48px 20px 40px; }
  .site-header__inner { padding: 16px 20px; }
  .site-header__meta { font-size: 11px; }
  .site-header__meta .sep { padding: 0 6px; }
  .cta-card { padding: 28px 22px; }
  .framework .split-nums { grid-template-columns: 1fr; }
  .stat .num { font-size: 34px; }
  h1.hero__title { font-size: 34px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}