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

:root {
  --color-primary: #4338ca;
  --color-secondary: #312e81;
  --color-accent: #c7d2fe;
  --color-bg: #ffffff;
  --color-surface: #f5f3ff;
  --color-text: #1e1b4b;
  --color-text-muted: #6366a0;
  --color-border: #d4d0e8;
  --font-main: 'Verdana', 'Geneva', 'Tahoma', sans-serif;
  --max-width: 1100px;
  --radius: 8px;
}

body {
  font-family: var(--font-main);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.7;
  font-size: 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 1rem;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2rem;
  margin-top: 3rem;
  margin-bottom: 1.25rem;
}

h3 {
  font-size: 1.5rem;
  margin-top: 2rem;
}

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

h5 {
  font-size: 1.1rem;
  margin-top: 1.25rem;
}

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

p {
  margin-bottom: 1.5rem;
  max-width: 70ch;
}

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

a:hover {
  color: var(--color-secondary);
  text-decoration-thickness: 3px;
}

a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: 2px;
}

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

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

blockquote {
  margin: 2.5rem 0;
  padding: 1.75rem 2rem;
  background-color: var(--color-surface);
  border-left: 6px solid var(--color-primary);
  position: relative;
  left: -1rem;
  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);
}

.site-header {
  background-color: var(--color-bg);
  border-bottom: 2px solid var(--color-border);
  padding: 2rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(67, 56, 202, 0.05);
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.site-header h1 {
  margin: 0;
  font-size: 1.75rem;
  color: var(--color-primary);
  position: relative;
  left: 1rem;
}

.site-header h1 a {
  text-decoration: none;
  color: inherit;
}

.site-nav {
  display: flex;
  gap: 2rem;
  align-items: center;
  position: relative;
  right: -1.5rem;
}

.site-nav a {
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.site-nav a:hover {
  background-color: var(--color-surface);
  box-shadow: 0 2px 6px rgba(67, 56, 202, 0.1);
}

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

.breadcrumbs {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
  position: relative;
  left: 2rem;
}

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

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

.breadcrumbs::after {
  content: '/';
  margin: 0 0.25rem;
}

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

.site-main {
  flex: 1;
  padding: 4rem 1.5rem;
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-surface) 100%);
}

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

.card {
  background-color: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2.5rem;
  margin-bottom: 2.5rem;
  box-shadow: 0 4px 12px rgba(67, 56, 202, 0.08);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
  top: -0.5rem;
}

.card:hover {
  box-shadow: 0 8px 24px rgba(67, 56, 202, 0.15);
  border-color: var(--color-primary);
}

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

table {
  width: 100%;
  border-collapse: collapse;
  margin: 2.5rem 0;
  background-color: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  left: 1rem;
}

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

th {
  padding: 1rem 1.25rem;
  text-align: left;
  font-weight: 700;
  border-bottom: 3px solid var(--color-primary);
}

td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

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

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

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

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

details {
  margin: 2rem 0;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-bg);
  overflow: hidden;
  position: relative;
  right: -1.5rem;
}

summary {
  padding: 1.25rem 1.75rem;
  cursor: pointer;
  font-weight: 700;
  color: var(--color-primary);
  background-color: var(--color-surface);
  transition: background-color 0.2s ease, color 0.2s ease;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

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

summary::before {
  content: '▶';
  display: inline-block;
  transition: transform 0.2s ease;
  font-size: 0.85rem;
}

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

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

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

details > *:not(summary) {
  padding: 1.75rem;
  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-secondary);
  color: var(--color-accent);
  padding: 3rem 1.5rem;
  margin-top: 4rem;
  border-top: 4px solid var(--color-primary);
  position: relative;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -2rem;
  left: 5%;
  width: 90%;
  height: 2rem;
  background-color: var(--color-surface);
  border-radius: var(--radius);
}

.site-footer .container {
  display: grid;
  gap: 2rem;
  position: relative;
}

.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);
}

.site-footer p {
  margin-bottom: 0.75rem;
  max-width: none;
}

@media (min-width: 768px) {
  body {
    font-size: 17px;
  }

  h1 {
    font-size: 3rem;
  }

  h2 {
    font-size: 2.25rem;
  }

  h3 {
    font-size: 1.75rem;
  }

  .site-header {
    padding: 2.5rem 2rem;
  }

  .site-header h1 {
    font-size: 2rem;
    left: 2rem;
  }

  .site-nav {
    gap: 2.5rem;
    right: -2rem;
  }

  .site-main {
    padding: 5rem 2rem;
  }

  .container {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 2rem;
  }

  .container > * {
    grid-column: 2 / 12;
  }

  .card {
    padding: 3rem;
    top: -1rem;
  }

  .card:nth-child(even) {
    grid-column: 3 / 13;
    left: -1.5rem;
  }

  .card:nth-child(odd) {
    grid-column: 1 / 11;
    right: -1.5rem;
  }

  blockquote {
    left: -2rem;
    padding: 2rem 2.5rem;
  }

  table {
    left: 2rem;
  }

  details {
    right: -2rem;
  }

  .breadcrumbs {
    left: 3rem;
  }

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

@media (min-width: 1024px) {
  body {
    font-size: 18px;
  }

  h1 {
    font-size: 3.5rem;
  }

  h2 {
    font-size: 2.5rem;
  }

  .site-header {
    padding: 3rem 2.5rem;
  }

  .site-header h1 {
    font-size: 2.25rem;
    left: 3rem;
  }

  .site-nav {
    gap: 3rem;
    right: -3rem;
  }

  .site-main {
    padding: 6rem 2.5rem;
  }

  .container {
    gap: 3rem;
  }

  .card {
    padding: 3.5rem;
    margin-bottom: 3.5rem;
  }

  .card:nth-child(even) {
    grid-column: 4 / 13;
    left: -2rem;
  }

  .card:nth-child(odd) {
    grid-column: 1 / 10;
    right: -2rem;
  }

  blockquote {
    left: -3rem;
    padding: 2.5rem 3rem;
  }

  table {
    left: 3rem;
  }

  details {
    right: -3rem;
  }

  .breadcrumbs {
    left: 4rem;
  }

  .site-footer {
    padding: 4rem 2.5rem;
  }

  .site-footer .container {
    gap: 4rem;
  }
}

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

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

  @keyframes slideDown {
    from {
      opacity: 1;
      transform: none;
    }
    to {
      opacity: 1;
      transform: none;
    }
  }
}

@media print {
  .site-header,
  .site-nav,
  .site-footer,
  .breadcrumbs {
    display: none;
  }

  .site-main {
    padding: 0;
    background: var(--color-bg);
  }

  .container {
    max-width: 100%;
    display: block;
  }

  .card {
    box-shadow: none;
    border: 1px solid var(--color-border);
    page-break-inside: avoid;
    position: static;
    left: 0;
    right: 0;
  }

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

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.85em;
    color: var(--color-text-muted);
  }

  table {
    position: static;
    left: 0;
  }

  details {
    position: static;
    right: 0;
  }

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

  blockquote {
    position: static;
    left: 0;
    page-break-inside: avoid;
  }
}