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

: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: 'Courier New', 'Lucida Console', Monaco, monospace;
  --max-width: 1100px;
  --radius: 2px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background-color: var(--color-bg);
  background-image: radial-gradient(circle, var(--color-border) 1px, transparent 1px);
  background-size: 20px 20px;
  color: var(--color-text);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: bold;
  line-height: 1.2;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  text-transform: uppercase;
  border-bottom: 4px dotted var(--color-primary);
  padding-bottom: 0.5rem;
  letter-spacing: 0.05em;
}

h2 {
  font-size: 2rem;
  margin-top: 2rem;
  border-left: 6px solid var(--color-primary);
  padding-left: 1rem;
}

h3 {
  font-size: 1.5rem;
  margin-top: 1.5rem;
  color: var(--color-secondary);
}

h4 {
  font-size: 1.25rem;
  margin-top: 1.25rem;
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 4px;
}

h5 {
  font-size: 1.125rem;
  margin-top: 1rem;
  color: var(--color-text-muted);
}

h6 {
  font-size: 1rem;
  margin-top: 1rem;
  font-style: italic;
}

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

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-style: dashed;
  text-underline-offset: 3px;
  transition: color 0.2s ease, background-color 0.2s ease;
}

a:hover {
  color: var(--color-secondary);
  background-color: var(--color-accent);
  text-decoration-style: solid;
}

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

strong {
  font-weight: bold;
  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);
  background-image: radial-gradient(circle, var(--color-accent) 1.5px, transparent 1.5px);
  background-size: 15px 15px;
  border-left: 6px solid var(--color-primary);
  font-style: italic;
  color: var(--color-text);
  position: relative;
}

blockquote::before {
  content: '"';
  font-size: 4rem;
  color: var(--color-accent);
  position: absolute;
  top: -10px;
  left: 10px;
  line-height: 1;
}

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

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

.site-header {
  background-color: var(--color-surface);
  border-bottom: 3px dashed var(--color-border);
  padding: 2rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.site-header .container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.site-header h1 {
  border: none;
  margin: 0;
  font-size: 2rem;
  padding: 0;
}

.site-nav {
  border-top: 2px dotted var(--color-border);
  padding-top: 1rem;
}

.site-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.site-nav li {
  margin: 0;
}

.site-nav a {
  display: block;
  padding: 0.5rem 1rem;
  background-color: var(--color-bg);
  border: 2px dotted var(--color-border);
  text-decoration: none;
  font-weight: bold;
  transition: all 0.2s ease;
}

.site-nav a:hover {
  background-color: var(--color-primary);
  color: var(--color-bg);
  border-style: solid;
  transform: translateY(-2px);
  box-shadow: 2px 2px 0 var(--color-secondary);
}

.site-nav a:focus-visible {
  outline: 3px dotted var(--color-secondary);
  outline-offset: 2px;
}

.breadcrumbs {
  padding: 1rem 0;
  border-bottom: 1px dashed var(--color-border);
  margin-bottom: 2rem;
  font-size: 0.875rem;
}

.breadcrumbs ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

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

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

.breadcrumbs a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

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

.site-footer {
  background-color: var(--color-text);
  color: var(--color-surface);
  padding: 3rem 0 2rem;
  margin-top: 4rem;
  border-top: 4px dotted var(--color-primary);
}

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

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

.site-footer p {
  color: var(--color-surface);
  opacity: 0.9;
}

.card {
  background-color: var(--color-bg);
  border: 3px dotted var(--color-border);
  padding: 1.5rem;
  margin-bottom: 2rem;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background-color: var(--color-primary);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.card:hover {
  box-shadow: 4px 4px 0 var(--color-accent);
  border-color: var(--color-primary);
  border-style: solid;
}

.card:hover::before {
  opacity: 1;
}

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

table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  background-color: var(--color-bg);
  border: 2px solid var(--color-border);
  font-size: 0.95rem;
}

table caption {
  font-weight: bold;
  padding: 1rem;
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-bottom: none;
  text-align: left;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

th {
  background-color: var(--color-primary);
  color: var(--color-bg);
  padding: 1rem;
  text-align: left;
  font-weight: bold;
  border: 2px dotted var(--color-secondary);
}

td {
  padding: 0.875rem 1rem;
  border: 1px dotted var(--color-border);
}

tbody tr {
  transition: background-color 0.2s ease;
}

tbody tr:nth-child(odd) {
  background-color: var(--color-surface);
  background-image: radial-gradient(circle, var(--color-border) 0.5px, transparent 0.5px);
  background-size: 10px 10px;
}

tbody tr:hover {
  background-color: var(--color-accent);
  background-image: none;
}

details {
  margin: 1.5rem 0;
  border: 2px dashed var(--color-border);
  background-color: var(--color-surface);
  overflow: hidden;
}

summary {
  padding: 1rem 1.5rem;
  cursor: pointer;
  font-weight: bold;
  background-color: var(--color-bg);
  border-bottom: 2px dashed var(--color-border);
  transition: background-color 0.2s ease, color 0.2s ease;
  list-style: none;
  position: relative;
  user-select: none;
}

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

summary::before {
  content: '▸';
  display: inline-block;
  margin-right: 0.5rem;
  transition: transform 0.2s ease;
}

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

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

summary:focus-visible {
  outline: 3px dotted var(--color-secondary);
  outline-offset: -3px;
}

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

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

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

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

li {
  margin-bottom: 0.5rem;
}

ul ul, ol ol, ul ol, ol ul {
  margin-top: 0.5rem;
  margin-bottom: 0.5rem;
}

hr {
  border: none;
  border-top: 2px dashed var(--color-border);
  margin: 3rem 0;
}

code {
  background-color: var(--color-surface);
  padding: 0.2rem 0.4rem;
  border: 1px dotted var(--color-border);
  font-family: var(--font-main);
  font-size: 0.9em;
  color: var(--color-secondary);
}

pre {
  background-color: var(--color-surface);
  background-image: radial-gradient(circle, var(--color-border) 1px, transparent 1px);
  background-size: 12px 12px;
  border: 2px solid var(--color-border);
  padding: 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
  border: 3px dotted var(--color-border);
  transition: border-color 0.2s ease;
}

img:hover {
  border-color: var(--color-primary);
  border-style: solid;
}

button, input[type="submit"], input[type="button"] {
  font-family: var(--font-main);
  padding: 0.75rem 1.5rem;
  background-color: var(--color-primary);
  color: var(--color-bg);
  border: 3px solid var(--color-primary);
  cursor: pointer;
  font-weight: bold;
  transition: all 0.2s ease;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

button:hover, input[type="submit"]:hover, input[type="button"]:hover {
  background-color: var(--color-secondary);
  border-color: var(--color-secondary);
  box-shadow: 4px 4px 0 var(--color-accent);
  transform: translate(-2px, -2px);
}

button:focus-visible, input[type="submit"]:focus-visible, input[type="button"]:focus-visible {
  outline: 3px dotted var(--color-text);
  outline-offset: 3px;
}

input[type="text"], input[type="email"], input[type="search"], textarea, select {
  font-family: var(--font-main);
  padding: 0.75rem;
  border: 2px dotted var(--color-border);
  background-color: var(--color-bg);
  color: var(--color-text);
  width: 100%;
  max-width: 500px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--color-primary);
  border-style: solid;
  box-shadow: 0 0 0 3px var(--color-accent);
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: bold;
  color: var(--color-text);
}

form {
  margin: 2rem 0;
}

fieldset {
  border: 2px dashed var(--color-border);
  padding: 1.5rem;
  margin: 1.5rem 0;
}

legend {
  padding: 0 0.5rem;
  font-weight: bold;
  color: var(--color-primary);
}

@media (min-width: 768px) {
  h1 {
    font-size: 3.5rem;
  }

  h2 {
    font-size: 2.5rem;
  }

  h3 {
    font-size: 1.875rem;
  }

  .site-header .container {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  .site-nav {
    border: none;
    padding: 0;
  }

  .site-nav ul {
    gap: 1rem;
  }

  .card {
    padding: 2rem;
  }

  table {
    font-size: 1rem;
  }
}

@media (min-width: 1024px) {
  h1 {
    font-size: 4rem;
  }

  .site-main {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .container {
    padding: 0 2rem;
  }
}

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

@media print {
  body {
    background: white;
    background-image: none;
  }

  .site-header {
    position: static;
    border-bottom: 2px solid black;
  }

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

  .site-main {
    max-width: 100%;
    padding: 1rem 0;
  }

  .site-footer {
    border-top: 2px solid black;
    background: white;
    color: black;
  }

  a {
    color: black;
    text-decoration: underline;
  }

  .card {
    border: 2px solid black;
    break-inside: avoid;
  }

  table {
    break-inside: avoid;
  }

  details {
    border: 1px solid black;
  }

  details[open] summary ~ * {
    display: block;
  }
}