* {
  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: 'Trebuchet MS', 'Lucida Sans', 'Lucida Grande', sans-serif;
  --max-width: 1100px;
  --radius: 0;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2.5rem;
  --spacing-xl: 4rem;
}

body {
  font-family: var(--font-main);
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-secondary);
  letter-spacing: -0.02em;
}

h1 {
  font-size: 3rem;
  text-shadow: 2px 2px 0 var(--color-accent);
  margin-bottom: var(--spacing-lg);
  border-bottom: 4px solid var(--color-primary);
  padding-bottom: var(--spacing-sm);
}

h2 {
  font-size: 2.25rem;
  text-shadow: 1px 1px 0 var(--color-accent);
  margin-top: var(--spacing-xl);
}

h3 {
  font-size: 1.75rem;
  color: var(--color-primary);
  margin-top: var(--spacing-lg);
}

h4 {
  font-size: 1.5rem;
  margin-top: var(--spacing-lg);
}

h5 {
  font-size: 1.25rem;
  margin-top: var(--spacing-md);
}

h6 {
  font-size: 1.1rem;
  margin-top: var(--spacing-md);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
  font-weight: 600;
}

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

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

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

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

blockquote {
  margin: var(--spacing-lg) 0;
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--color-surface);
  border-left: 6px solid var(--color-primary);
  font-size: 1.15rem;
  font-style: italic;
  color: var(--color-text-muted);
  position: relative;
}

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

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

.site-header {
  background-color: var(--color-secondary);
  color: var(--color-bg);
  padding: var(--spacing-lg) var(--spacing-md);
  border-bottom: 5px solid var(--color-primary);
  position: relative;
}

.site-header::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
}

.site-header h1 {
  color: var(--color-bg);
  font-size: 2.5rem;
  margin: 0;
  border: none;
  text-shadow: 3px 3px 0 var(--color-primary);
  letter-spacing: 0.02em;
}

.site-header p {
  color: var(--color-accent);
  font-size: 1.1rem;
  margin: var(--spacing-xs) 0 0 0;
  font-weight: 600;
}

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

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

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

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

.site-nav a {
  display: block;
  padding: var(--spacing-md) var(--spacing-sm);
  color: var(--color-bg);
  border: none;
  border-right: 2px solid var(--color-secondary);
  text-align: center;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.9rem;
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.site-nav li:last-child a {
  border-right: none;
}

.site-nav a:hover {
  background-color: var(--color-secondary);
  color: var(--color-accent);
  box-shadow: inset 0 -4px 0 var(--color-accent);
}

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

.breadcrumbs {
  padding: var(--spacing-sm) 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  align-items: center;
}

.breadcrumbs a {
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
  font-weight: 500;
}

.breadcrumbs a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.breadcrumbs span {
  color: var(--color-border);
}

.site-main {
  min-height: 60vh;
  padding: var(--spacing-xl) 0;
}

.site-footer {
  background-color: var(--color-surface);
  border-top: 4px solid var(--color-primary);
  padding: var(--spacing-xl) var(--spacing-md);
  margin-top: var(--spacing-xl);
  color: var(--color-text-muted);
}

.site-footer a {
  color: var(--color-primary);
  font-weight: 600;
}

.site-footer p {
  font-size: 0.95rem;
}

.card {
  background-color: var(--color-bg);
  border: 3px solid var(--color-border);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  outline: 1px solid var(--color-surface);
  outline-offset: -6px;
}

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

.card h2, .card h3, .card h4 {
  margin-top: 0;
}

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

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

table th {
  padding: var(--spacing-md);
  text-align: left;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.9rem;
  border-bottom: 3px solid var(--color-primary);
}

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

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

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

table tbody tr:hover {
  background-color: var(--color-accent);
}

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

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

summary {
  padding: var(--spacing-md);
  cursor: pointer;
  font-weight: 700;
  color: var(--color-secondary);
  background-color: var(--color-surface);
  border-bottom: 2px solid var(--color-border);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

summary::after {
  content: '▼';
  font-size: 0.8rem;
  color: var(--color-primary);
  transition: transform 0.2s ease;
}

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

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

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

details[open] summary {
  border-bottom: 3px solid var(--color-primary);
}

details div {
  padding: var(--spacing-lg);
}

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

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

figcaption {
  padding: var(--spacing-sm);
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-top: none;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  font-style: italic;
}

ul, ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
}

li {
  margin-bottom: var(--spacing-xs);
  line-height: 1.6;
}

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

code {
  font-family: 'Courier New', Courier, monospace;
  background-color: var(--color-surface);
  padding: 0.2em 0.4em;
  border: 1px solid var(--color-border);
  font-size: 0.9em;
  color: var(--color-secondary);
}

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

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

hr {
  border: none;
  border-top: 4px solid var(--color-border);
  margin: var(--spacing-xl) 0;
  position: relative;
}

hr::after {
  content: '◆';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-bg);
  color: var(--color-primary);
  padding: 0 var(--spacing-sm);
  font-size: 1.2rem;
}

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

  h1 {
    font-size: 4rem;
  }

  h2 {
    font-size: 2.75rem;
  }

  h3 {
    font-size: 2rem;
  }

  .site-header h1 {
    font-size: 3.5rem;
  }

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

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

  .site-nav a {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
  }

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

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

@media (min-width: 1024px) {
  h1 {
    font-size: 4.5rem;
  }

  h2 {
    font-size: 3rem;
  }

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

  .site-header h1 {
    font-size: 4rem;
  }

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

@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,
  .breadcrumbs {
    display: none;
  }

  .site-header {
    border-bottom: 2px solid var(--color-text);
  }

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

  .card {
    border: 1px solid var(--color-text);
    box-shadow: none;
    page-break-inside: avoid;
  }

  a {
    color: var(--color-text);
    text-decoration: underline;
  }

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

  body {
    font-size: 12pt;
    line-height: 1.5;
    color: #000;
  }

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