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

:root {
  --color-primary: #2563eb;
  --color-secondary: #1d4ed8;
  --color-accent: #bfdbfe;
  --color-bg: #ffffff;
  --color-surface: #eff6ff;
  --color-text: #172554;
  --color-text-muted: #6080b0;
  --color-border: #c8daf0;
  --font-main: 'Verdana', 'Geneva', 'Tahoma', sans-serif;
  --max-width: 1100px;
  --radius: 0;
}

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

body {
  font-family: var(--font-main);
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image: radial-gradient(circle, var(--color-border) 1px, transparent 1px);
  background-size: 20px 20px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--color-text);
}

h1 {
  font-size: 2.5rem;
  border: 6px solid var(--color-text);
  padding: 1.5rem;
  background-color: var(--color-primary);
  color: var(--color-bg);
  box-shadow: 8px 8px 0 var(--color-text);
  margin-bottom: 2rem;
}

h2 {
  font-size: 2rem;
  border-bottom: 4px dashed var(--color-primary);
  padding-bottom: 0.75rem;
  margin-top: 2rem;
}

h3 {
  font-size: 1.5rem;
  border-left: 6px dotted var(--color-primary);
  padding-left: 1rem;
  margin-top: 1.5rem;
}

h4 {
  font-size: 1.25rem;
  margin-top: 1.5rem;
}

h5 {
  font-size: 1.1rem;
  margin-top: 1rem;
}

h6 {
  font-size: 1rem;
  margin-top: 1rem;
  color: var(--color-text-muted);
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 3px solid var(--color-accent);
  font-weight: 600;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

a:hover {
  background-color: var(--color-primary);
  color: var(--color-bg);
  border-bottom-color: var(--color-primary);
}

a:focus-visible {
  outline: 4px dotted var(--color-text);
  outline-offset: 4px;
}

strong {
  font-weight: 700;
  color: var(--color-text);
}

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

blockquote {
  margin: 2rem 0;
  padding: 1.5rem;
  background-color: var(--color-surface);
  border-left: 8px solid var(--color-primary);
  border-top: 3px dotted var(--color-border);
  border-bottom: 3px dotted var(--color-border);
  font-style: italic;
  position: relative;
}

blockquote::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: radial-gradient(circle, var(--color-accent) 1px, transparent 1px);
  background-size: 12px 12px;
  opacity: 0.3;
  pointer-events: none;
}

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

.site-header {
  background-color: var(--color-bg);
  border-bottom: 6px solid var(--color-text);
  padding: 1.5rem 1rem;
  box-shadow: 0 8px 0 var(--color-accent);
  position: relative;
  z-index: 100;
}

.site-header::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  right: 0;
  height: 6px;
  background-image: repeating-linear-gradient(90deg, var(--color-text) 0, var(--color-text) 10px, transparent 10px, transparent 20px);
}

.site-nav {
  display: flex;
  gap: 0;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.site-nav a {
  padding: 0.75rem 1.5rem;
  background-color: var(--color-surface);
  border: 4px solid var(--color-text);
  border-right: none;
  border-bottom: none;
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.9rem;
  letter-spacing: 0.5px;
}

.site-nav a:first-child {
  border-left: 4px solid var(--color-text);
}

.site-nav a:hover {
  background-color: var(--color-primary);
  color: var(--color-bg);
  transform: translateY(-4px);
  box-shadow: 0 4px 0 var(--color-text);
}

.site-main {
  flex: 1;
  padding: 2rem 1rem;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  background-color: var(--color-bg);
  padding: 2rem;
  border: 5px solid var(--color-text);
  box-shadow: 12px 12px 0 var(--color-accent);
}

.breadcrumbs {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px dashed var(--color-border);
  flex-wrap: wrap;
}

.breadcrumbs a {
  font-size: 0.9rem;
  border-bottom-width: 2px;
}

.breadcrumbs::before {
  content: '→';
  color: var(--color-primary);
  font-weight: 700;
}

.card {
  background-color: var(--color-surface);
  border: 4px solid var(--color-text);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 6px 6px 0 var(--color-border);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
  position: relative;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 30px 30px 0;
  border-color: transparent var(--color-primary) transparent transparent;
}

.card:hover {
  box-shadow: 10px 10px 0 var(--color-border);
  transform: translate(-2px, -2px);
}

table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 2rem 0;
  border: 4px solid var(--color-text);
  background-color: var(--color-bg);
}

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

table th {
  padding: 1rem;
  text-align: left;
  font-weight: 700;
  border-right: 3px dotted var(--color-accent);
  text-transform: uppercase;
  font-size: 0.9rem;
}

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

table td {
  padding: 1rem;
  border-right: 2px dotted var(--color-border);
  border-bottom: 2px dashed var(--color-border);
}

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

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

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

table tbody tr:hover {
  background-color: var(--color-accent);
  transition: background-color 0.2s ease;
}

details {
  margin: 1.5rem 0;
  border: 4px solid var(--color-text);
  background-color: var(--color-surface);
}

summary {
  padding: 1.25rem;
  cursor: pointer;
  font-weight: 700;
  background-color: var(--color-bg);
  border-bottom: 3px dashed var(--color-border);
  list-style: none;
  position: relative;
  transition: background-color 0.2s ease;
  user-select: none;
}

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

summary::before {
  content: '▶';
  display: inline-block;
  margin-right: 0.75rem;
  color: var(--color-primary);
  transition: transform 0.2s ease;
}

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

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

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

details[open] summary {
  background-color: var(--color-primary);
  color: var(--color-bg);
  border-bottom-color: var(--color-text);
}

details[open] summary::before {
  color: var(--color-bg);
}

details > *:not(summary) {
  padding: 1.5rem;
  animation: slideDown 0.2s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.site-footer {
  background-color: var(--color-text);
  color: var(--color-bg);
  padding: 2rem 1rem;
  border-top: 8px dashed var(--color-primary);
  margin-top: 4rem;
  position: relative;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: radial-gradient(circle, var(--color-secondary) 1px, transparent 1px);
  background-size: 15px 15px;
  opacity: 0.4;
  pointer-events: none;
}

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

.site-footer a:hover {
  background-color: var(--color-bg);
  color: var(--color-text);
}

button, .button {
  display: inline-block;
  padding: 0.875rem 1.75rem;
  background-color: var(--color-primary);
  color: var(--color-bg);
  border: 4px solid var(--color-text);
  font-family: var(--font-main);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: 5px 5px 0 var(--color-text);
  transition: box-shadow 0.2s ease, transform 0.2s ease, background-color 0.2s ease;
}

button:hover, .button:hover {
  background-color: var(--color-secondary);
  box-shadow: 8px 8px 0 var(--color-text);
  transform: translate(-2px, -2px);
  border-bottom-color: var(--color-text);
}

button:active, .button:active {
  box-shadow: 2px 2px 0 var(--color-text);
  transform: translate(2px, 2px);
}

button:focus-visible, .button:focus-visible {
  outline: 4px dotted var(--color-accent);
  outline-offset: 4px;
}

input[type="text"],
input[type="email"],
input[type="search"],
input[type="url"],
textarea {
  width: 100%;
  padding: 0.75rem;
  border: 4px solid var(--color-text);
  background-color: var(--color-bg);
  font-family: var(--font-main);
  font-size: 1rem;
  color: var(--color-text);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-accent);
}

textarea {
  min-height: 150px;
  resize: vertical;
}

ul, ol {
  margin: 1rem 0 1rem 2rem;
}

li {
  margin-bottom: 0.5rem;
  padding-left: 0.5rem;
}

ul li::marker {
  color: var(--color-primary);
}

ol li::marker {
  color: var(--color-primary);
  font-weight: 700;
}

hr {
  border: none;
  border-top: 4px dashed var(--color-border);
  margin: 2rem 0;
  position: relative;
}

hr::after {
  content: '❄';
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-bg);
  padding: 0 1rem;
  color: var(--color-primary);
  font-size: 1.25rem;
}

code {
  background-color: var(--color-surface);
  padding: 0.25rem 0.5rem;
  border: 2px dotted var(--color-border);
  font-family: 'Courier New', monospace;
  font-size: 0.9em;
  color: var(--color-secondary);
}

pre {
  background-color: var(--color-surface);
  border: 4px solid var(--color-text);
  padding: 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  position: relative;
}

pre code {
  border: none;
  padding: 0;
  background: none;
}

pre::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 8px;
  background: repeating-linear-gradient(90deg, var(--color-primary) 0, var(--color-primary) 10px, var(--color-secondary) 10px, var(--color-secondary) 20px);
}

@media (min-width: 768px) {
  h1 {
    font-size: 3rem;
    padding: 2rem;
  }

  h2 {
    font-size: 2.25rem;
  }

  h3 {
    font-size: 1.75rem;
  }

  .site-nav {
    gap: 0;
  }

  .site-nav a {
    flex: 0 0 auto;
  }

  .container {
    padding: 3rem;
  }

  .site-main {
    padding: 3rem 1.5rem;
  }

  .card {
    padding: 2rem;
  }
}

@media (min-width: 1024px) {
  .site-header {
    padding: 2rem;
  }

  .site-main {
    padding: 4rem 2rem;
  }

  .container {
    padding: 4rem;
    box-shadow: 16px 16px 0 var(--color-accent);
  }

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

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

  details > *:not(summary) {
    animation: none;
  }
}

@media print {
  body {
    background: none;
    color: #000;
  }

  .site-nav,
  .site-footer {
    display: none;
  }

  .container {
    border: 2px solid #000;
    box-shadow: none;
    max-width: 100%;
  }

  a {
    color: #000;
    border-bottom: 1px solid #000;
  }

  .card {
    break-inside: avoid;
    box-shadow: none;
  }

  h1, h2, h3 {
    break-after: avoid;
  }
}