body {
  margin: 0;
  font-family: Arial, system-ui, sans-serif;
  color: #1f2937;
  background: #f7faf9;
  line-height: 1.7;
}

header {
  background: #115e59;
  color: #fff;
  padding: 18px 20px;
}

header a {
  color: #fff;
  font-weight: 800;
  text-decoration: none;
}

main {
  max-width: 1040px;
  margin: 0 auto;
  padding: 38px 20px 72px;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 18px;
  padding: 7px 12px;
  border-radius: 999px;
  background: #dff2ef;
  color: #115e59;
  font-size: 0.9rem;
  font-weight: 800;
}

h1 {
  max-width: 920px;
  margin: 0 0 18px;
  color: #111827;
  font-size: clamp(2.15rem, 5vw, 3.8rem);
  line-height: 1.08;
}

h2 {
  margin: 34px 0 12px;
  color: #115e59;
  font-size: clamp(1.45rem, 3vw, 2rem);
  line-height: 1.2;
}

h3 {
  margin: 0 0 8px;
  color: #111827;
}

p {
  margin: 0 0 16px;
}

.lead {
  max-width: 880px;
  color: #4b5563;
  font-size: 1.12rem;
}

.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.card,
.note {
  border: 1px solid #dbe4e7;
  border-radius: 10px;
  background: #fff;
  padding: 20px;
  box-shadow: 0 10px 26px rgba(17, 94, 89, 0.06);
}

.note {
  border-left: 5px solid #f59e0b;
}

.formula {
  overflow-x: auto;
  border-radius: 10px;
  background: #0f172a;
  color: #f8fafc;
  padding: 16px;
  font-family: "Courier New", monospace;
  font-size: 0.95rem;
  line-height: 1.6;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0;
}

.cta,
.secondary {
  display: inline-block;
  border-radius: 8px;
  padding: 13px 18px;
  font-weight: 800;
  text-decoration: none;
}

.cta {
  background: #f59e0b;
  color: #fff;
}

.secondary {
  border: 1px solid #115e59;
  color: #115e59;
  background: #fff;
}

a {
  color: #115e59;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  background: #fff;
}

th,
td {
  border: 1px solid #dbe4e7;
  padding: 11px;
  text-align: left;
  vertical-align: top;
}

th {
  background: #ecf8f6;
  color: #115e59;
}

ul,
ol {
  padding-left: 22px;
}

li {
  margin: 7px 0;
}

footer {
  border-top: 1px solid #dbe4e7;
  margin-top: 42px;
  padding-top: 22px;
  color: #64748b;
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  main {
    padding: 28px 16px 56px;
  }

  .card,
  .note {
    padding: 16px;
  }
}