/* =========================================================
   Babson College × Eduba
   Editorial-institutional layout. Institutional green only.
   Typography: Oswald (display) + Zilla Slab (body).
   No gradients, no neon, no dark surfaces.
   ========================================================= */

:root {
  --green: #006644;
  --green-deep: #054B32;
  --green-light: #469042;
  --ink: #1a1a1a;
  --ink-soft: #3a3a3a;
  --rule: #d9d9d9;
  --alt: #F4F4F4;
  --paper: #FFFFFF;
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  --shadow-subtle: 0 1px 2px rgba(0,0,0,0.08);
  --shadow-medium: 0 4px 12px rgba(0,0,0,0.12);
  --max: 1160px;
  --gutter: clamp(20px, 4vw, 48px);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Zilla Slab', Georgia, 'Times New Roman', serif;
  font-weight: 400;
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { max-width: 100%; display: block; }

a {
  color: var(--green);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 140ms ease;
}
a:hover { color: var(--green-deep); }
a:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
  border-radius: 2px;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

/* -------- Header -------- */
.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  padding: 22px 0 20px;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.logo { height: 30px; width: auto; }
.logo svg { height: 100%; width: auto; }
.meta-eyebrow {
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 12px;
  color: var(--green);
}

/* -------- Hero -------- */
.hero {
  border-bottom: 1px solid var(--rule);
  padding: clamp(48px, 8vw, 96px) 0 clamp(40px, 6vw, 72px);
  position: relative;
  background: var(--paper);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 5vw, 56px);
  align-items: start;
}
@media (min-width: 900px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr) 340px; }
}
.eyebrow {
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  font-weight: 500;
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--green);
  margin: 0 0 18px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  display: inline-block;
  width: 28px;
  height: 2px;
  background: var(--green);
}

h1 {
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  font-weight: 600;
  letter-spacing: 0.01em;
  font-size: clamp(34px, 5.6vw, 64px);
  line-height: 1.05;
  color: var(--green);
  margin: 0 0 24px;
  text-transform: none;
}
h1 .emph {
  color: var(--ink);
  display: block;
  font-weight: 500;
}

.lede {
  font-size: clamp(18px, 1.6vw, 21px);
  line-height: 1.5;
  color: var(--ink-soft);
  max-width: 58ch;
  margin: 0 0 32px;
}

.hero-meta {
  border-left: 3px solid var(--green);
  padding: 4px 0 4px 20px;
  background: var(--paper);
}
.hero-meta dt {
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--green);
  margin-top: 14px;
}
.hero-meta dt:first-of-type { margin-top: 0; }
.hero-meta dd {
  margin: 4px 0 0;
  font-size: 16px;
  color: var(--ink);
}

/* Ranking card (institutional pull quote) */
.ranking {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-top: 4px solid var(--green);
  padding: 28px 26px;
  box-shadow: var(--shadow-subtle);
}
.ranking-label {
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 11px;
  color: var(--green);
  margin: 0 0 10px;
}
.ranking-number {
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  font-weight: 600;
  font-size: 56px;
  line-height: 1;
  color: var(--green);
  margin: 0 0 10px;
  letter-spacing: 0.01em;
}
.ranking-body {
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink);
  margin: 0;
}

/* -------- Section scaffolding -------- */
section.block {
  padding: clamp(56px, 7vw, 88px) 0;
  border-bottom: 1px solid var(--rule);
}
section.alt { background: var(--alt); }

.section-head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.section-num {
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  font-weight: 500;
  color: var(--green);
  font-size: 14px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
h2 {
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  font-weight: 600;
  letter-spacing: 0.01em;
  font-size: clamp(26px, 3vw, 36px);
  line-height: 1.15;
  color: var(--green);
  margin: 0;
}

.prose p {
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  margin: 0 0 18px;
  max-width: 66ch;
}
.prose p:last-child { margin-bottom: 0; }
.prose strong { color: var(--ink); font-weight: 600; }

/* -------- The Read (opening context) -------- */
.read-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}
@media (min-width: 900px) {
  .read-grid { grid-template-columns: 1.4fr 1fr; gap: 56px; }
}
.read-aside {
  padding: 28px;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--green);
}
.read-aside h3 {
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green);
  margin: 0 0 16px;
}
.read-aside ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
.read-aside li {
  padding: 12px 0;
  border-top: 1px solid var(--rule);
  font-size: 15px;
  line-height: 1.5;
  display: flex;
  gap: 12px;
}
.read-aside li:first-child { border-top: 0; padding-top: 0; }
.read-aside li .k {
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  color: var(--green);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  min-width: 72px;
  padding-top: 2px;
}

/* -------- 60 / 30 / 10 framework -------- */
.sixty-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 36px;
}
@media (min-width: 700px) {
  .sixty-grid { grid-template-columns: repeat(3, 1fr); gap: 20px; }
}
.tier {
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 28px 26px 30px;
  position: relative;
  transition: border-color 180ms ease, transform 180ms ease;
}
.tier:hover { border-color: var(--green); transform: translateY(-2px); }
.tier .tier-num {
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  font-weight: 600;
  font-size: 46px;
  line-height: 1;
  color: var(--green);
  margin: 0;
  letter-spacing: 0.01em;
}
.tier .tier-num sup { font-size: 18px; top: -1.4em; color: var(--green-light); }
.tier h3 {
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 13px;
  color: var(--ink);
  margin: 16px 0 10px;
}
.tier p {
  margin: 0;
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-soft);
}

/* -------- Case / paper cards -------- */
.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 28px;
}
@media (min-width: 800px) {
  .cards { grid-template-columns: 1fr 1fr; gap: 28px; }
}
.card {
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 32px 30px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.card .card-label {
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--green);
  margin: 0;
}
.card h3 {
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  font-weight: 600;
  font-size: 22px;
  line-height: 1.2;
  color: var(--ink);
  margin: 0;
  letter-spacing: 0.01em;
}
.card p { margin: 0; font-size: 16px; line-height: 1.55; color: var(--ink-soft); }
.card .card-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 4px;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
}
.card .card-links a {
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--green);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.card .card-links a::after {
  content: "";
  width: 10px; height: 10px;
  border-right: 1.5px solid var(--green);
  border-top: 1.5px solid var(--green);
  transform: rotate(45deg);
  transition: transform 180ms ease;
}
.card .card-links a:hover::after { transform: rotate(45deg) translate(2px, -2px); }

/* -------- Credibility strip -------- */
.cred-strip {
  background: var(--green);
  color: #fff;
  padding: clamp(40px, 6vw, 60px) 0;
}
.cred-strip h2 { color: #fff; }
.cred-strip .section-num { color: rgba(255,255,255,0.75); }
.cred-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 28px;
}
@media (min-width: 700px) {
  .cred-grid { grid-template-columns: repeat(3, 1fr); gap: 32px; }
}
.cred-item {
  border-top: 2px solid rgba(255,255,255,0.4);
  padding-top: 18px;
}
.cred-item .big {
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  font-weight: 600;
  font-size: clamp(34px, 4vw, 44px);
  line-height: 1;
  letter-spacing: 0.01em;
  color: #fff;
  margin: 0 0 10px;
}
.cred-item p { margin: 0; font-size: 15.5px; line-height: 1.55; color: rgba(255,255,255,0.92); }
.cred-item a { color: #fff; text-decoration-color: rgba(255,255,255,0.6); }
.cred-item a:hover { color: #fff; text-decoration-color: #fff; }

/* -------- Note of scope -------- */
.scope-note {
  background: var(--alt);
  border-left: 3px solid var(--green);
  padding: 22px 26px;
  margin-top: 28px;
  max-width: 64ch;
}
.scope-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-soft);
}
.scope-note p strong {
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 11px;
  display: block;
  color: var(--green);
  margin-bottom: 6px;
  font-weight: 500;
}

/* -------- CTA section -------- */
.cta {
  background: var(--paper);
  padding: clamp(64px, 9vw, 104px) 0;
  border-bottom: 1px solid var(--rule);
}
.cta-inner {
  max-width: 760px;
  margin: 0 auto;
  text-align: left;
}
.cta h2 {
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.1;
  margin-bottom: 22px;
}
.cta p {
  font-size: 18px;
  line-height: 1.55;
  color: var(--ink);
  margin: 0 0 18px;
}
.cta .detail {
  font-size: 15px;
  color: var(--ink-soft);
  margin: 0 0 30px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  background: var(--green);
  color: #fff;
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 15px;
  text-decoration: none;
  padding: 18px 26px;
  border: 2px solid var(--green);
  border-radius: var(--radius-sm);
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
  min-height: 48px;
}
.btn::after {
  content: "";
  width: 10px; height: 10px;
  border-right: 2px solid currentColor;
  border-top: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform 180ms ease;
}
.btn:hover {
  background: var(--green-deep);
  border-color: var(--green-deep);
  color: #fff;
}
.btn:hover::after { transform: rotate(45deg) translate(3px, -3px); }
.btn:focus-visible {
  outline: 3px solid var(--green-light);
  outline-offset: 3px;
}

.cta-matt {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--rule);
  font-size: 15px;
  color: var(--ink-soft);
  flex-wrap: wrap;
}
.cta-matt .who {
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 12px;
  color: var(--green);
}

/* -------- Footer -------- */
footer.site-footer {
  background: var(--paper);
  padding: 32px 0 42px;
}
.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--ink-soft);
}
.site-footer .prepared {
  font-family: 'Oswald', 'Arial Narrow', sans-serif;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 11.5px;
  color: var(--ink-soft);
}
.site-footer a { color: var(--green); }

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

/* -------- Small-screen tuning (375px) -------- */
@media (max-width: 420px) {
  body { font-size: 16px; }
  .site-header { padding: 16px 0; }
  .logo { height: 24px; }
  .meta-eyebrow { font-size: 11px; letter-spacing: 0.12em; }
  h1 { font-size: 34px; }
  .lede { font-size: 17px; }
  .ranking-number { font-size: 44px; }
  .tier { padding: 22px 20px 24px; }
  .card { padding: 24px 22px; }
  .btn { width: 100%; justify-content: space-between; font-size: 14px; padding: 16px 20px; }
  .cta-matt { font-size: 14px; }
}