:root {
  --color-bg: #F7F6F2;
  --color-surface: #FFFFFF;
  --color-text: #111827;
  --color-muted: #4B5563;
  --color-border: #D1D5DB;
  --color-primary: #2A2F8F;
  --color-secondary: #0F766E;
  --color-accent: #D9480F;
  --radius: 0.25rem;
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --space: 1rem;
  --measure: 65ch;
}

* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  margin: 0;
  padding: 0;
  font-size: clamp(1rem, 2.5vw, 1.125rem);
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-primary);
  color: white;
  padding: 8px;
  text-decoration: none;
  border-radius: var(--radius);
  z-index: 1000;
}

.skip-link:focus {
  top: 6px;
}

header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space);
}

.nav-brand a {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav-brand a:hover,
.nav-brand a:focus-visible {
  color: var(--color-secondary);
}

.nav-links {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: calc(var(--space) * 1.5);
}

.nav-links a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
  padding: 0.5rem;
  border-radius: var(--radius);
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--color-primary);
  background-color: var(--color-bg);
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: calc(var(--space) * 2) var(--space);
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(var(--space) * 2);
}

article {
  background-color: var(--color-surface);
  padding: calc(var(--space) * 2);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.2;
  color: var(--color-primary);
  margin: 0 0 calc(var(--space) * 1.5) 0;
  font-weight: 700;
}

h2 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  line-height: 1.3;
  color: var(--color-secondary);
  margin: calc(var(--space) * 2) 0 var(--space) 0;
  font-weight: 600;
}

h3 {
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  line-height: 1.4;
  color: var(--color-text);
  margin: calc(var(--space) * 1.5) 0 calc(var(--space) * 0.75) 0;
  font-weight: 600;
}

p {
  max-width: var(--measure);
  margin: 0 0 var(--space) 0;
}

a {
  color: var(--color-primary);
  transition: color 0.2s ease;
}

a:hover,
a:focus-visible {
  color: var(--color-accent);
}

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius);
}

blockquote {
  border-left: 4px solid var(--color-secondary);
  padding-left: calc(var(--space) * 1.5);
  margin: calc(var(--space) * 1.5) 0;
  font-style: italic;
  color: var(--color-muted);
  background-color: var(--color-bg);
  padding: calc(var(--space) * 1.5);
  border-radius: var(--radius);
}

blockquote p {
  margin: 0;
}

.breadcrumb {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0 0 calc(var(--space) * 1.5) 0;
  font-size: 0.875rem;
}

.breadcrumb li:not(:last-child)::after {
  content: ' > ';
  margin: 0 0.5rem;
  color: var(--color-muted);
}

.breadcrumb a {
  color: var(--color-muted);
  text-decoration: none;
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--color-primary);
}

details {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin: 0 0 var(--space) 0;
  background-color: var(--color-surface);
}

details[open] {
  border-color: var(--color-secondary);
}

summary {
  padding: var(--space);
  cursor: pointer;
  font-weight: 600;
  color: var(--color-primary);
  transition: background-color 0.2s ease, color 0.2s ease;
  border-radius: var(--radius);
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::before {
  content: '+';
  display: inline-block;
  width: 1.5rem;
  text-align: center;
  font-weight: bold;
  transition: transform 0.2s ease;
}

details[open] summary::before {
  content: '−';
}

summary:hover,
summary:focus-visible {
  background-color: var(--color-bg);
  color: var(--color-secondary);
}

summary:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
}

.details-content {
  padding: 0 var(--space) var(--space) var(--space);
  border-top: 1px solid var(--color-border);
}

.details-content p:last-child {
  margin-bottom: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: calc(var(--space) * 1.5) 0;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

caption {
  font-weight: 600;
  color: var(--color-secondary);
  padding: var(--space);
  text-align: left;
  background-color: var(--color-bg);
  border-bottom: 2px solid var(--color-border);
}

th,
td {
  padding: calc(var(--space) * 0.75);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  background-color: var(--color-secondary);
  color: white;
  font-weight: 600;
  position: sticky;
  top: 0;
  z-index: 10;
}

tbody tr:nth-child(even) {
  background-color: var(--color-bg);
}

tbody tr:hover {
  background-color: rgba(42, 47, 143, 0.05);
}

.table-container {
  overflow-x: auto;
  margin: calc(var(--space) * 1.5) 0;
}

section {
  margin: calc(var(--space) * 2) 0;
}

section:first-of-type {
  margin-top: 0;
}

footer {
  background-color: var(--color-text);
  color: var(--color-bg);
  text-align: center;
  padding: calc(var(--space) * 1.5);
  margin-top: calc(var(--space) * 3);
}

footer p {
  margin: 0;
  max-width: none;
}

@media (min-width: 768px) {
  main {
    grid-template-columns: 1fr;
    gap: calc(var(--space) * 3);
  }
  
  .nav-links {
    gap: calc(var(--space) * 2);
  }
  
  article {
    padding: calc(var(--space) * 3);
  }
  
  .table-container {
    overflow-x: visible;
  }
}

@media (min-width: 1024px) {
  main {
    padding: calc(var(--space) * 3) var(--space);
  }
  
  section {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

@media (max-width: 767px) {
  .nav-links {
    gap: var(--space);
  }
  
  .nav-links a {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
  }
  
  table {
    font-size: 0.875rem;
  }
  
  th,
  td {
    padding: 0.5rem;
  }
  
  .table-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  
  table {
    min-width: 600px;
  }
}