* {
  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: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --max-width: 1100px;
  --radius: 6px;
}

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

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;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

h1 {
  font-size: 2.5rem;
  border-bottom: 3px dotted var(--color-primary);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}

h2 {
  font-size: 2rem;
  border-bottom: 2px dashed var(--color-secondary);
  padding-bottom: 0.4rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.5rem;
  margin-top: 1.5rem;
  position: relative;
  padding-left: 1rem;
}

h3::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--color-primary);
  border-radius: var(--radius);
}

h4 {
  font-size: 1.25rem;
  color: var(--color-secondary);
  margin-top: 1.25rem;
}

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

h6 {
  font-size: 1rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 1rem;
}

p {
  margin-bottom: 1rem;
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-style: dotted;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  transition: color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

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

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

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

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

blockquote {
  margin: 1.5rem 0;
  padding: 1.25rem 1.5rem;
  background: var(--color-surface);
  background-image: radial-gradient(circle, var(--color-accent) 1px, transparent 1px);
  background-size: 12px 12px;
  border-left: 5px dotted var(--color-primary);
  font-style: italic;
  color: var(--color-text);
  border-radius: 0 var(--radius) var(--radius) 0;
}

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

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

.site-header {
  background-color: var(--color-surface);
  border-bottom: 4px dotted var(--color-primary);
  padding: 1.5rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background-image: radial-gradient(circle, var(--color-accent) 1px, transparent 1px);
  background-size: 16px 16px;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-header h1 {
  font-size: 1.75rem;
  margin: 0;
  border: none;
  padding: 0;
}

.site-header a {
  text-decoration: none;
  color: var(--color-text);
  transition: color 0.2s ease, transform 0.2s ease;
  display: inline-block;
}

.site-header a:hover {
  color: var(--color-primary);
  background: transparent;
  transform: scale(1.05);
}

.site-nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.site-nav a {
  padding: 0.5rem 1rem;
  background-color: var(--color-bg);
  border: 2px dotted var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-text);
  font-weight: 500;
  transition: all 0.2s ease;
}

.site-nav a:hover {
  background-color: var(--color-primary);
  color: var(--color-bg);
  border-color: var(--color-primary);
  border-style: solid;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(37, 99, 235, 0.2);
}

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

.site-main {
  flex: 1;
  padding: 2rem 0;
}

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

.breadcrumbs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 1.5rem;
  padding: 0.75rem 1rem;
  background-color: var(--color-surface);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  font-size: 0.9rem;
}

.breadcrumbs a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.breadcrumbs a:hover {
  color: var(--color-primary);
  background: transparent;
}

.breadcrumbs::after {
  content: '/';
  color: var(--color-text-muted);
  margin: 0 0.25rem;
}

.breadcrumbs :last-child::after {
  content: '';
  margin: 0;
}

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

.card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 8px 16px rgba(37, 99, 235, 0.1);
  border-style: solid;
}

.card h2 {
  margin-top: 0;
}

.card h3 {
  margin-top: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background-color: var(--color-bg);
  border: 2px dotted var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

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

th {
  padding: 1rem;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px dashed var(--color-bg);
}

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

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

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

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

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

details {
  margin: 1.5rem 0;
  border: 2px dotted var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  transition: border-color 0.2s ease;
}

details[open] {
  border-color: var(--color-primary);
  border-style: solid;
}

summary {
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--color-secondary);
  user-select: none;
  transition: background-color 0.2s ease, color 0.2s ease;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

summary::before {
  content: '▶';
  display: inline-block;
  transition: transform 0.2s ease;
  color: var(--color-primary);
  font-size: 0.8em;
}

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

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

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

details > *:not(summary) {
  padding: 0 1.25rem 1rem 1.25rem;
  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-surface);
  border-top: 4px dashed var(--color-primary);
  padding: 2rem 0;
  margin-top: 3rem;
  background-image: radial-gradient(circle, var(--color-border) 1px, transparent 1px);
  background-size: 15px 15px;
}

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

.site-footer p {
  color: var(--color-text-muted);
  margin: 0;
}

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

input, textarea, select, button {
  font-family: var(--font-main);
  font-size: 1rem;
  padding: 0.75rem 1rem;
  border: 2px dotted var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-bg);
  color: var(--color-text);
  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 rgba(37, 99, 235, 0.1);
}

button {
  cursor: pointer;
  background-color: var(--color-primary);
  color: var(--color-bg);
  border: 2px solid var(--color-primary);
  font-weight: 600;
  transition: all 0.2s ease;
}

button:hover {
  background-color: var(--color-secondary);
  border-color: var(--color-secondary);
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(29, 78, 216, 0.3);
}

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

button:active {
  transform: translateY(0);
}

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

  h2 {
    font-size: 2.25rem;
  }

  h3 {
    font-size: 1.75rem;
  }

  .site-header .container {
    flex-wrap: nowrap;
  }

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

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

  .card {
    padding: 2rem;
  }

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

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

  .site-header {
    padding: 2rem 0;
  }

  .site-main {
    padding: 4rem 0;
  }

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

  .card {
    padding: 2.5rem;
  }

  details > *:not(summary) {
    padding: 0 2rem 1.5rem 2rem;
  }

  summary {
    padding: 1.25rem 2rem;
  }
}

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

  html {
    scroll-behavior: auto;
  }

  summary::before {
    transition: none;
  }

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

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

  .site-header {
    position: static;
    border-bottom: 2px solid black;
    background: white;
    background-image: none;
  }

  .site-nav {
    display: none;
  }

  .site-footer {
    border-top: 2px solid black;
    background: white;
    background-image: none;
  }

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

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

  .card {
    border: 1px solid black;
    page-break-inside: avoid;
  }

  details {
    border: 1px solid black;
  }

  details[open] summary::before {
    transform: none;
  }

  table {
    border: 1px solid black;
  }

  thead {
    background: #f0f0f0;
    color: black;
  }

  tbody tr:nth-child(even) {
    background: #f9f9f9;
    background-image: none;
  }
}