:root {
  --color-primary: #2B2D42;
  --color-secondary: #3A86FF;
  --color-accent: #FFBE0B;
  --color-bg: #F7F7FB;
  --color-surface: #FFFFFF;
  --color-text: #111318;
  --color-muted: #4B5563;
  --color-border: #1F2937;
  --radius: 10px;
  --shadow: 6px 6px 0 #1F2937;
  --space: 1rem;
}

* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  margin: 0;
  padding: 0;
}

/* Typography */
h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 900;
  line-height: 1.2;
  margin: 0 0 var(--space) 0;
  color: var(--color-primary);
}

h2 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 800;
  line-height: 1.3;
  margin: calc(var(--space) * 2) 0 var(--space) 0;
  color: var(--color-primary);
}

h3 {
  font-size: clamp(1.1rem, 2.5vw, 1.25rem);
  font-weight: 700;
  line-height: 1.4;
  margin: calc(var(--space) * 1.5) 0 calc(var(--space) * 0.5) 0;
  color: var(--color-primary);
}

p {
  margin: 0 0 var(--space) 0;
  max-width: 70ch;
}

/* Layout */
body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
}

header {
  background-color: var(--color-surface);
  border-bottom: 4px solid var(--color-border);
  box-shadow: var(--shadow);
}

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

.nav-brand a {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--color-primary);
  text-decoration: none;
}

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

.nav-links a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border: 2px solid transparent;
  border-radius: var(--radius);
  transition: all 0.2s ease;
}

.nav-links a:hover {
  border-color: var(--color-secondary);
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--color-secondary);
}

.nav-links a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: calc(var(--space) * 2) var(--space);
}

article {
  background-color: var(--color-surface);
  padding: calc(var(--space) * 2);
  border: 4px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

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

/* Breadcrumbs */
.breadcrumb {
  list-style: none;
  padding: 0;
  margin: 0 0 calc(var(--space) * 2) 0;
  display: flex;
  gap: 0.5rem;
  font-size: 0.9rem;
}

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

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

.breadcrumb a:hover {
  text-decoration: underline;
}

/* Links */
a {
  color: var(--color-secondary);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 2px;
}

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

a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* Tables */
.table-wrapper {
  overflow-x: auto;
  margin: var(--space) 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-surface);
  border: 4px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

caption {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-primary);
  text-align: left;
  padding: var(--space);
  background-color: var(--color-bg);
  border: 4px solid var(--color-border);
  border-bottom: none;
  border-radius: var(--radius) var(--radius) 0 0;
}

th, td {
  padding: calc(var(--space) * 0.75);
  text-align: left;
  border-bottom: 2px solid var(--color-border);
}

th {
  background-color: var(--color-primary);
  color: var(--color-surface);
  font-weight: 700;
}

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

tbody tr:hover {
  background-color: rgba(58, 134, 255, 0.1);
}

/* Details/Summary Accordion */
details {
  border: 3px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: var(--space);
  background-color: var(--color-surface);
  box-shadow: 4px 4px 0 var(--color-border);
}

details[open] {
  border-color: var(--color-secondary);
  box-shadow: 6px 6px 0 var(--color-secondary);
}

summary {
  padding: var(--space);
  font-weight: 700;
  cursor: pointer;
  background-color: var(--color-bg);
  border-radius: calc(var(--radius) - 3px);
  list-style: none;
  position: relative;
}

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

summary::before {
  content: '+';
  position: absolute;
  right: var(--space);
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--color-secondary);
}

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

summary:hover {
  background-color: var(--color-secondary);
  color: var(--color-surface);
}

summary:hover::before {
  color: var(--color-surface);
}

summary:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

details p {
  padding: 0 var(--space) var(--space) var(--space);
  margin: 0;
}

/* Footer */
footer {
  background-color: var(--color-primary);
  color: var(--color-surface);
  text-align: center;
  padding: var(--space);
  border-top: 4px solid var(--color-border);
}

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

/* Responsive Design */
@media (max-width: 768px) {
  nav {
    flex-direction: column;
    gap: var(--space);
  }
  
  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  main {
    padding: var(--space);
  }
  
  article {
    padding: var(--space);
  }
  
  .table-wrapper {
    font-size: 0.9rem;
  }
}

@media (min-width: 1024px) {
  main {
    padding: calc(var(--space) * 3) var(--space);
  }
  
  article {
    padding: calc(var(--space) * 3);
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
  
  .nav-links a:hover {
    transform: none;
  }
}

/* Focus Management */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* Print Styles */
@media print {
  body {
    background: white;
    color: black;
  }
  
  header, footer {
    background: white;
    color: black;
    border: 1px solid black;
  }
  
  article {
    border: 1px solid black;
    box-shadow: none;
  }
  
  a {
    color: black;
    text-decoration: underline;
  }
  
  details {
    border: 1px solid black;
    box-shadow: none;
  }
  
  details summary {
    background: white;
  }
}