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

:root {
  --color-primary: #0d9488;
  --color-secondary: #134e4a;
  --color-accent: #99f6e4;
  --color-bg: #ffffff;
  --color-surface: #f0fdfa;
  --color-text: #0c3530;
  --color-text-muted: #5b8a83;
  --color-border: #b8ddd6;
  --font-main: 'Verdana', 'Geneva', 'Tahoma', sans-serif;
  --max-width: 1100px;
  --radius: 0;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
}

body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: bold;
  margin-bottom: var(--spacing-md);
  color: var(--color-secondary);
  text-shadow: 2px 2px 0 var(--color-accent);
}

h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: 2rem;
  margin-top: var(--spacing-lg);
}

h3 {
  font-size: 1.5rem;
  margin-top: var(--spacing-md);
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.125rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: var(--spacing-sm);
}

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

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

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

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

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

blockquote {
  margin: var(--spacing-lg) 0;
  padding: var(--spacing-md);
  background-color: var(--color-surface);
  border-left: 4px solid var(--color-primary);
  font-style: italic;
  color: var(--color-text-muted);
}

blockquote p:last-child {
  margin-bottom: 0;
}

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

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

.site-header {
  background-color: var(--color-secondary);
  color: var(--color-bg);
  padding: var(--spacing-lg) 0;
  border-bottom: 4px solid var(--color-accent);
  box-shadow: 0 4px 0 var(--color-primary);
}

.site-header h1 {
  color: var(--color-bg);
  text-shadow: 3px 3px 0 var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.site-header p {
  color: var(--color-accent);
  font-size: 1.125rem;
  margin-bottom: 0;
}

.site-nav {
  background-color: var(--color-primary);
  border-bottom: 3px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

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

.site-nav a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-bg);
  text-decoration: none;
  border: 2px solid var(--color-secondary);
  border-right: none;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  text-align: center;
  font-weight: bold;
}

.site-nav li:last-child a {
  border-right: 2px solid var(--color-secondary);
}

.site-nav a:hover {
  background-color: var(--color-accent);
  color: var(--color-secondary);
  border-color: var(--color-secondary);
}

.site-nav a:focus-visible {
  outline: 3px solid var(--color-bg);
  outline-offset: -3px;
  z-index: 1;
  position: relative;
}

.site-main {
  padding: var(--spacing-xl) 0;
}

.breadcrumbs {
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-sm);
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  font-size: 0.875rem;
}

.breadcrumbs ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  align-items: center;
}

.breadcrumbs li::after {
  content: "→";
  margin-left: var(--spacing-xs);
  color: var(--color-text-muted);
}

.breadcrumbs li:last-child::after {
  content: "";
}

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

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

.card {
  background-color: var(--color-bg);
  border: 3px solid var(--color-primary);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
  box-shadow: 6px 6px 0 var(--color-accent);
}

.card:hover {
  border-color: var(--color-secondary);
  box-shadow: 8px 8px 0 var(--color-primary);
}

.card h2, .card h3 {
  text-shadow: 1px 1px 0 var(--color-accent);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-lg) 0;
  background-color: var(--color-bg);
  border: 3px solid var(--color-primary);
}

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

th {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  font-weight: bold;
  border: 2px solid var(--color-primary);
  text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.3);
}

td {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--color-border);
}

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

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

details {
  margin: var(--spacing-md) 0;
  border: 3px solid var(--color-border);
  background-color: var(--color-surface);
}

summary {
  padding: var(--spacing-md);
  cursor: pointer;
  font-weight: bold;
  color: var(--color-secondary);
  background-color: var(--color-bg);
  border-bottom: 3px solid var(--color-border);
  transition: background-color 0.2s ease, color 0.2s ease;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

summary::after {
  content: "▼";
  font-size: 0.75rem;
  color: var(--color-primary);
  transition: transform 0.2s ease;
}

details[open] summary::after {
  transform: rotate(-180deg);
}

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

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

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

details > *:not(summary) {
  padding: var(--spacing-md);
}

.site-footer {
  background-color: var(--color-secondary);
  color: var(--color-bg);
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  border-top: 4px solid var(--color-accent);
  margin-top: var(--spacing-xl);
}

.site-footer a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

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

ul:not(.site-nav ul):not(.breadcrumbs ul) {
  margin: var(--spacing-md) 0;
  padding-left: var(--spacing-lg);
}

ol {
  margin: var(--spacing-md) 0;
  padding-left: var(--spacing-lg);
}

li {
  margin-bottom: var(--spacing-xs);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border: 3px solid var(--color-border);
}

button, input[type="submit"], input[type="button"] {
  font-family: var(--font-main);
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-primary);
  color: var(--color-bg);
  border: 3px solid var(--color-secondary);
  cursor: pointer;
  font-weight: bold;
  font-size: 1rem;
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 4px 4px 0 var(--color-accent);
}

button:hover, input[type="submit"]:hover, input[type="button"]:hover {
  background-color: var(--color-secondary);
  box-shadow: 6px 6px 0 var(--color-primary);
}

button:focus-visible, input[type="submit"]:focus-visible, input[type="button"]:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

input[type="text"], input[type="email"], input[type="password"], input[type="search"], input[type="tel"], input[type="url"], textarea, select {
  font-family: var(--font-main);
  padding: var(--spacing-sm);
  border: 3px solid var(--color-border);
  background-color: var(--color-bg);
  color: var(--color-text);
  font-size: 1rem;
  width: 100%;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input[type="text"]:focus, input[type="email"]:focus, input[type="password"]:focus, input[type="search"]:focus, input[type="tel"]:focus, input[type="url"]:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-accent);
}

label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: bold;
  color: var(--color-secondary);
}

form {
  margin: var(--spacing-lg) 0;
}

fieldset {
  border: 3px solid var(--color-border);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

legend {
  padding: 0 var(--spacing-sm);
  font-weight: bold;
  color: var(--color-secondary);
  text-shadow: 1px 1px 0 var(--color-accent);
}

code {
  background-color: var(--color-surface);
  padding: 0.125rem 0.25rem;
  border: 1px solid var(--color-border);
  font-family: 'Courier New', monospace;
  font-size: 0.875rem;
  color: var(--color-secondary);
}

pre {
  background-color: var(--color-surface);
  padding: var(--spacing-md);
  border: 3px solid var(--color-border);
  overflow-x: auto;
  margin: var(--spacing-lg) 0;
}

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

hr {
  border: none;
  border-top: 3px solid var(--color-border);
  margin: var(--spacing-xl) 0;
}

@media (min-width: 768px) {
  body {
    font-size: 18px;
  }

  h1 {
    font-size: 3rem;
  }

  h2 {
    font-size: 2.25rem;
  }

  h3 {
    font-size: 1.75rem;
  }

  .site-nav ul {
    justify-content: center;
  }

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

  .container {
    padding: 0 var(--spacing-lg);
  }

  .card {
    padding: var(--spacing-xl);
  }

  table {
    font-size: 1rem;
  }
}

@media (min-width: 1024px) {
  h1 {
    font-size: 3.5rem;
  }

  h2 {
    font-size: 2.5rem;
  }

  .site-header {
    padding: var(--spacing-xl) 0;
  }

  .site-main {
    padding: calc(var(--spacing-xl) * 1.5) 0;
  }

  .card {
    box-shadow: 8px 8px 0 var(--color-accent);
  }

  .card:hover {
    box-shadow: 10px 10px 0 var(--color-primary);
  }
}

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

  summary::after {
    transition: none;
  }
}

@media print {
  .site-nav {
    display: none;
  }

  .breadcrumbs {
    display: none;
  }

  .site-footer {
    border-top: 1px solid #000;
    background-color: transparent;
    color: #000;
  }

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

  .card {
    border: 1px solid #000;
    box-shadow: none;
    page-break-inside: avoid;
  }

  a {
    text-decoration: underline;
    color: #000;
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.8rem;
  }

  h1, h2, h3, h4, h5, h6 {
    text-shadow: none;
    page-break-after: avoid;
  }

  table {
    border: 1px solid #000;
  }

  th, td {
    border: 1px solid #000;
  }
}