:root {
  --color-bg: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-text: #0B1220;
  --color-muted: #475569;
  --color-border: #CBD5E1;
  --color-primary: #1E3A8A;
  --color-secondary: #0F766E;
  --color-accent: #D97706;
  --radius: 0.375rem;
  --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, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
  font-size: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  margin: 0;
  padding: 0;
}

h1, h2, h3, h4, h5, h6 {
  font-family: Georgia, 'Times New Roman', Times, serif;
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 var(--space) 0;
  color: var(--color-text);
}

h1 {
  font-size: clamp(1.75rem, 1.5rem + 1.25vw, 2.5rem);
  margin-bottom: calc(var(--space) * 1.5);
}

h2 {
  font-size: clamp(1.375rem, 1.25rem + 0.625vw, 1.875rem);
  margin-top: calc(var(--space) * 2);
}

h3 {
  font-size: clamp(1.125rem, 1rem + 0.625vw, 1.5rem);
  margin-top: calc(var(--space) * 1.5);
}

p, li {
  margin: 0 0 var(--space) 0;
}

ul, ol {
  margin: 0 0 var(--space) 0;
  padding-left: calc(var(--space) * 1.5);
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 0.125em;
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}

a:hover {
  color: var(--color-secondary);
  text-decoration-color: var(--color-secondary);
}

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgb(217 119 6 / 0.1);
  border-radius: 2px;
}

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

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space) calc(var(--space) * 1.5);
}

.nav-brand a {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

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

.nav-links a {
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 0;
}

.breadcrumb {
  display: flex;
  list-style: none;
  margin: 0 0 calc(var(--space) * 1.5) 0;
  padding: 0;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-muted);
}

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

main {
  display: grid;
  grid-template-columns: 1fr min(var(--measure), 100%) 1fr;
  gap: calc(var(--space) * 2);
  padding: calc(var(--space) * 2) calc(var(--space) * 1.5);
  min-height: calc(100vh - 200px);
}

main > * {
  grid-column: 2;
}

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

aside {
  background-color: var(--color-bg);
  padding: calc(var(--space) * 1.5);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  margin: calc(var(--space) * 1.5) 0;
}

aside h3 {
  margin-top: 0;
  font-size: 1.125rem;
  color: var(--color-secondary);
}

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

blockquote p {
  margin: 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 {
  padding: var(--space);
  font-weight: 600;
  text-align: left;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

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

th {
  background-color: var(--color-primary);
  color: var(--color-surface);
  font-weight: 600;
  position: sticky;
  top: 0;
}

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

tbody tr:hover {
  background-color: rgb(30 58 138 / 0.05);
}

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

summary {
  padding: var(--space) calc(var(--space) * 1.5);
  background-color: var(--color-bg);
  cursor: pointer;
  font-weight: 600;
  color: var(--color-primary);
  transition: background-color 0.2s ease;
  list-style: none;
}

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

summary::before {
  content: '+';
  float: right;
  font-weight: bold;
  transition: transform 0.2s ease;
}

details[open] summary::before {
  transform: rotate(45deg);
}

summary:hover, summary:focus {
  background-color: rgb(30 58 138 / 0.05);
}

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

.details-content {
  padding: calc(var(--space) * 1.5);
  background-color: var(--color-surface);
}

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

footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: calc(var(--space) * 1.5);
  text-align: center;
  color: var(--color-muted);
  font-size: 0.875rem;
}

@media (min-width: 768px) {
  nav {
    padding: calc(var(--space) * 1.5) calc(var(--space) * 2);
  }
  
  main {
    padding: calc(var(--space) * 3) calc(var(--space) * 2);
  }
  
  article {
    padding: calc(var(--space) * 3);
  }
  
  .nav-links {
    gap: calc(var(--space) * 2);
  }
}

@media (min-width: 1024px) {
  main {
    grid-template-columns: 1fr min(calc(var(--measure) * 1.2), 100%) 1fr;
  }
  
  aside {
    float: right;
    width: 300px;
    margin-left: calc(var(--space) * 2);
    margin-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto !important;
  }
}