* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-primary: #475569;
  --color-secondary: #1e293b;
  --color-accent: #38bdf8;
  --color-bg: #ffffff;
  --color-surface: #f8fafc;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --font-main: 'Trebuchet MS', 'Lucida Sans', 'Lucida Grande', sans-serif;
  --max-width: 1100px;
  --radius: 0;
}

html {
  font-size: 16px;
  line-height: 1.6;
}

body {
  font-family: var(--font-main);
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-surface) 100%);
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: -0.02em;
}

h1 {
  font-size: 3rem;
  border: 6px solid var(--color-secondary);
  padding: 1.5rem;
  background: var(--color-surface);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1), 8px 8px 0 var(--color-accent);
  margin-bottom: 2rem;
}

h2 {
  font-size: 2.25rem;
  border-left: 8px solid var(--color-accent);
  padding-left: 1rem;
  margin-top: 2rem;
}

h3 {
  font-size: 1.75rem;
  border-bottom: 4px solid var(--color-primary);
  padding-bottom: 0.5rem;
  margin-top: 1.5rem;
}

h4 {
  font-size: 1.5rem;
  color: var(--color-primary);
}

h5 {
  font-size: 1.25rem;
  color: var(--color-primary);
}

h6 {
  font-size: 1.125rem;
  color: var(--color-text-muted);
}

p {
  margin-bottom: 1rem;
  max-width: 70ch;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 700;
  border-bottom: 3px solid transparent;
  transition: border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease;
  position: relative;
}

a:hover {
  border-bottom-color: var(--color-accent);
  background: rgba(56, 189, 248, 0.1);
}

a:focus-visible {
  outline: 4px solid var(--color-accent);
  outline-offset: 2px;
  background: rgba(56, 189, 248, 0.2);
}

strong {
  font-weight: 900;
  color: var(--color-secondary);
}

em {
  font-style: italic;
  color: var(--color-primary);
}

blockquote {
  border-left: 8px solid var(--color-secondary);
  background: var(--color-surface);
  padding: 1.5rem;
  margin: 2rem 0;
  font-size: 1.125rem;
  font-style: italic;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.08), 4px 4px 0 var(--color-border);
  border-top: 3px solid var(--color-border);
  border-bottom: 3px solid var(--color-border);
}

::selection {
  background: var(--color-accent);
  color: var(--color-bg);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

.site-header {
  background: var(--color-secondary);
  border-bottom: 8px solid var(--color-accent);
  padding: 2rem 0;
  box-shadow: 0 4px 0 var(--color-primary), 0 8px 16px rgba(0, 0, 0, 0.15);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.site-header .container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: center;
}

.site-header h1 {
  font-size: 2rem;
  border: 4px solid var(--color-accent);
  padding: 0.75rem 1.5rem;
  background: var(--color-bg);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1), 6px 6px 0 var(--color-primary);
  margin: 0;
  color: var(--color-secondary);
}

.site-nav {
  width: 100%;
}

.site-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  justify-content: center;
}

.site-nav li {
  flex: 1 1 auto;
  min-width: 120px;
}

.site-nav a {
  display: block;
  padding: 0.875rem 1.5rem;
  background: var(--color-primary);
  color: var(--color-bg);
  border: 4px solid var(--color-secondary);
  border-bottom: none;
  font-weight: 900;
  text-transform: uppercase;
  text-align: center;
  letter-spacing: 0.05em;
  font-size: 0.875rem;
  transition: background-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.site-nav a:hover {
  background: var(--color-accent);
  color: var(--color-secondary);
  box-shadow: inset 0 -4px 0 rgba(0, 0, 0, 0.2);
  transform: translateY(2px);
  border-bottom: none;
}

.site-nav a:focus-visible {
  outline: 4px solid var(--color-bg);
  outline-offset: -8px;
  border-bottom: none;
}

.site-main {
  flex: 1;
  padding: 3rem 0;
}

.site-footer {
  background: var(--color-secondary);
  color: var(--color-surface);
  border-top: 8px solid var(--color-primary);
  padding: 2rem 0;
  margin-top: 4rem;
  box-shadow: inset 0 4px 8px rgba(0, 0, 0, 0.2);
}

.site-footer .container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  text-align: center;
}

.site-footer a {
  color: var(--color-accent);
  border-bottom-color: transparent;
}

.site-footer a:hover {
  color: var(--color-bg);
  border-bottom-color: var(--color-bg);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
  padding: 1rem;
  background: var(--color-surface);
  border: 3px solid var(--color-border);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
  font-size: 0.875rem;
}

.breadcrumbs a {
  color: var(--color-primary);
  font-weight: 700;
}

.breadcrumbs a::after {
  content: '→';
  margin-left: 0.5rem;
  color: var(--color-text-muted);
  font-weight: 900;
}

.breadcrumbs a:last-child::after {
  content: '';
}

.card {
  background: var(--color-surface);
  border: 5px solid var(--color-secondary);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.08), 8px 8px 0 var(--color-border);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.card:hover {
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.08), 12px 12px 0 var(--color-accent);
  transform: translate(-2px, -2px);
}

.card h2, .card h3 {
  margin-top: 0;
}

table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 2rem 0;
  border: 5px solid var(--color-secondary);
  background: var(--color-bg);
  box-shadow: 8px 8px 0 var(--color-border);
}

table thead {
  background: var(--color-secondary);
  color: var(--color-bg);
}

table th {
  padding: 1rem;
  text-align: left;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-right: 3px solid var(--color-primary);
  font-size: 0.875rem;
}

table th:last-child {
  border-right: none;
}

table td {
  padding: 1rem;
  border-right: 3px solid var(--color-border);
  border-bottom: 3px solid var(--color-border);
  transition: background-color 0.2s ease;
}

table td:last-child {
  border-right: none;
}

table tbody tr:last-child td {
  border-bottom: none;
}

table tbody tr:nth-child(odd) {
  background: var(--color-surface);
}

table tbody tr:hover {
  background: rgba(56, 189, 248, 0.1);
}

table tbody tr:hover td {
  color: var(--color-secondary);
}

details {
  border: 4px solid var(--color-primary);
  background: var(--color-surface);
  margin-bottom: 1rem;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05), 4px 4px 0 var(--color-border);
  transition: box-shadow 0.2s ease;
}

details[open] {
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05), 6px 6px 0 var(--color-accent);
}

summary {
  padding: 1.25rem;
  font-weight: 900;
  text-transform: uppercase;
  cursor: pointer;
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg) 100%);
  border-bottom: 4px solid transparent;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
  user-select: none;
  list-style: none;
  position: relative;
  padding-left: 2.5rem;
}

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

summary::before {
  content: '▶';
  position: absolute;
  left: 1rem;
  transition: transform 0.2s ease;
  color: var(--color-accent);
  font-size: 0.875rem;
}

details[open] summary::before {
  transform: rotate(90deg);
}

summary:hover {
  background: var(--color-accent);
  color: var(--color-secondary);
  border-bottom-color: var(--color-secondary);
}

summary:focus-visible {
  outline: 4px solid var(--color-accent);
  outline-offset: -4px;
}

details div {
  padding: 1.5rem;
  border-top: 3px solid var(--color-border);
}

@media (min-width: 768px) {
  .site-header .container {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  .site-header h1 {
    font-size: 2.5rem;
  }

  .site-nav {
    width: auto;
  }

  .site-nav ul {
    justify-content: flex-end;
  }

  .site-nav li {
    flex: 0 1 auto;
  }

  h1 {
    font-size: 3.5rem;
  }

  h2 {
    font-size: 2.5rem;
  }

  .site-footer .container {
    grid-template-columns: repeat(2, 1fr);
    text-align: left;
  }

  .card {
    padding: 2.5rem;
  }

  table th, table td {
    padding: 1.25rem;
  }
}

@media (min-width: 1024px) {
  .site-header h1 {
    font-size: 3rem;
  }

  h1 {
    font-size: 4rem;
  }

  h2 {
    font-size: 3rem;
  }

  .site-footer .container {
    grid-template-columns: repeat(3, 1fr);
  }
}

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

  summary::before {
    transition: none;
  }

  .card:hover {
    transform: none;
  }

  .site-nav a:hover {
    transform: none;
  }
}

@media print {
  .site-header,
  .site-nav,
  .site-footer,
  .breadcrumbs {
    display: none;
  }

  .site-main {
    padding: 0;
  }

  .container {
    max-width: 100%;
    padding: 0;
  }

  .card {
    border: 2px solid var(--color-secondary);
    box-shadow: none;
    page-break-inside: avoid;
  }

  table {
    box-shadow: none;
    border: 2px solid var(--color-secondary);
  }

  a {
    color: var(--color-text);
    border-bottom: 1px solid var(--color-text);
  }

  h1 {
    box-shadow: none;
    border: 3px solid var(--color-secondary);
  }

  details {
    box-shadow: none;
  }

  details[open] {
    box-shadow: none;
  }
}