body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
  background-color: #f5f5f5;
  color: #111;
}
header {
  background: #003366;
  color: #fff;
  padding: 1.5rem 1rem;
}
header h1 {
  margin: 0 0 0.25rem 0;
  font-size: 1.7rem;
}
header p {
  margin: 0.2rem 0;
  font-size: 0.95rem;
  max-width: 40rem;
}
nav {
  margin-top: 0.75rem;
  font-size: 0.9rem;
}
nav a {
  color: #cce6ff;
  text-decoration: none;
  margin-right: 1rem;
}
nav a:hover {
  text-decoration: underline;
}
main {
  padding: 1.5rem 1rem 3rem 1rem;
  max-width: 1000px;
  margin: 0 auto;
}
section {
  margin-bottom: 2rem;
  background: #ffffff;
  padding: 1.25rem 1rem;
  border-radius: 6px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}
section h2 {
  margin-top: 0;
  font-size: 1.4rem;
  border-bottom: 1px solid #e0e0e0;
  padding-bottom: 0.4rem;
}
section h3 {
  margin-top: 1.25rem;
  font-size: 1.05rem;
}
p {
  margin: 0.5rem 0;
  font-size: 0.95rem;
}
ul {
  margin: 0.5rem 0 0.5rem 1.25rem;
  padding-left: 0;
  font-size: 0.95rem;
}
li {
  margin: 0.25rem 0;
}
a {
  color: #004c99;
}
a:hover {
  text-decoration: underline;
}
.metrics-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.75rem;
}
.metric-card {
  flex: 1 1 140px;
  min-width: 140px;
  background: #edf3fa;
  border-radius: 4px;
  padding: 0.6rem 0.7rem;
  font-size: 0.85rem;
}
.metric-label {
  font-weight: 600;
  display: block;
}
.metric-value {
  font-weight: 400;
}
.acronym-box {
  background: #f0f0f0;
  border-radius: 4px;
  padding: 0.75rem;
  font-size: 0.9rem;
}
.acronym-box h3 {
  margin-top: 0;
  font-size: 1rem;
}
.acronym-box ul {
  margin-left: 1rem;
}
.acronym-box strong {
  white-space: nowrap;
}
footer {
  background: #002b4d;
  color: #d9e6f2;
  font-size: 0.75rem;
  padding: 0.75rem 1rem;
  text-align: center;
}
footer p {
  margin: 0.2rem 0;
}
@media (min-width: 768px) {
  header, main, footer {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}