:root {
  --brand-primary: #1c4c96;
  --brand-secondary: #f0622c;
  --neutral-100: #ffffff;
  --neutral-200: #f5f7fb;
  --neutral-400: #6b7280;
  --neutral-700: #1f2937;
  --border-color: #d5d9e2;
  --code-bg: #0f172a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--neutral-200);
  color: var(--neutral-700);
  line-height: 1.6;
}

header {
  background: var(--brand-primary);
  color: var(--neutral-100);
  padding: 1.5rem 2rem;
}

header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
}

header p {
  margin: 0;
  font-size: 0.95rem;
  max-width: 60rem;
}

nav {
  background: var(--neutral-100);
  border-bottom: 1px solid var(--border-color);
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0.5rem 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

nav a {
  color: var(--brand-primary);
  text-decoration: none;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: 0.5rem;
  transition: background 0.2s ease, color 0.2s ease;
}

nav a:hover,
nav a:focus {
  background: rgba(28, 76, 150, 0.1);
  color: var(--brand-secondary);
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem;
}

section + section {
  margin-top: 2.5rem;
}

section h2 {
  color: var(--brand-primary);
  margin-bottom: 0.5rem;
}

section p.lead {
  font-size: 1.05rem;
  margin-bottom: 1rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  background: var(--neutral-100);
  border: 1px solid var(--border-color);
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.08);
}

table thead {
  background: rgba(28, 76, 150, 0.08);
}

table th,
table td {
  padding: 0.75rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border-color);
}

table th {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--neutral-400);
}

table td {
  font-size: 0.95rem;
}

code {
  background: rgba(15, 23, 42, 0.9);
  color: var(--neutral-100);
  padding: 0.15rem 0.35rem;
  border-radius: 0.35rem;
  font-size: 0.9rem;
}

footer {
  background: var(--brand-primary);
  color: var(--neutral-100);
  padding: 1.25rem 2rem;
  margin-top: 2rem;
}

footer p {
  margin: 0;
  font-size: 0.9rem;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.summary-card {
  background: var(--neutral-100);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 1.25rem;
  box-shadow: 0 2px 4px rgba(15, 23, 42, 0.06);
}

.summary-card h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  color: var(--brand-primary);
}

.summary-card p {
  margin: 0;
  color: var(--neutral-400);
}

dt {
  font-weight: 600;
  color: var(--brand-primary);
}

dd {
  margin: 0 0 0.75rem 0;
}

a.section-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--brand-secondary);
}

@media (max-width: 768px) {
  header,
  nav ul,
  main,
  footer {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }
}