/* section shell */
section {
  padding: 72px 0;
  border-top: 2px solid var(--divider);
}
section.hero {
  border-top: 0;
}
#download {
  padding: 64px 0 72px;
}
.section-head {
  max-width: 640px;
  margin-bottom: 44px;
}
.kicker {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--green-dark);
  margin-bottom: 12px;
}
.section-head h2 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 12px;
  line-height: 1.35;
}
.section-head h2:last-child {
  margin-bottom: 0;
}
.section-head p {
  color: var(--muted);
  font-size: 15.5px;
}

/* pillars */
.pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.pillar {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px 24px;
}
.pillar .icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--mint);
  color: var(--green);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.pillar h3 {
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 8px;
}
.pillar p {
  color: var(--muted);
  font-size: 14.5px;
}

/* audience split */
.audience {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 22px;
}
.aud-card {
  border-radius: var(--radius);
  padding: 32px 28px;
}
.aud-card.teacher {
  background: var(--green);
  color: var(--card);
}
.aud-card.student {
  background: var(--card);
  border: 1px solid var(--card-border);
}
.aud-card h3 {
  font-size: 21px;
  font-weight: 800;
  margin-bottom: 4px;
}
.aud-card.teacher h3 {
  color: var(--card);
}
.aud-card .tag {
  font-size: 13px;
  margin-bottom: 20px;
}
.aud-card.teacher .tag {
  color: var(--mint-pale);
}
.aud-card.student .tag {
  color: var(--muted-2);
}
.aud-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
}
.aud-card li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 14.5px;
  padding: 11px 0;
}
.aud-card.teacher li {
  border-top: 1px solid rgba(247, 251, 250, 0.28);
}
.aud-card.student li {
  border-top: 1px solid var(--card-border);
}
.aud-card li:first-child {
  border-top: none;
}
.aud-card li .chk {
  font-weight: 900;
}
.aud-card.teacher li .chk {
  color: var(--mint-pale);
}
.aud-card.student li .chk {
  color: var(--green);
}