* {
  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: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --max-width: 1100px;
  --radius: 8px;
  --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: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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: none;
  transition: color 0.2s ease, background-color 0.2s ease;
  position: relative;
}

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

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

strong {
  font-weight: 600;
  color: var(--color-secondary);
}

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

blockquote {
  background: var(--color-surface);
  border-left: 4px solid var(--color-primary);
  padding: var(--spacing-md);
  margin: var(--spacing-md) 0;
  font-style: italic;
  color: var(--color-text-muted);
  position: relative;
  left: -0.5rem;
}

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

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

.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) var(--spacing-sm);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(67, 56, 202, 0.08);
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
}

.site-header h1 {
  font-size: 1.5rem;
  margin: 0;
  color: var(--color-primary);
}

.site-nav {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.site-nav a {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius);
  transition: background-color 0.2s ease, color 0.2s ease;
  font-weight: 500;
}

.site-nav a:hover {
  background-color: var(--color-surface);
  color: var(--color-primary);
}

.site-nav a:focus-visible {
  background-color: var(--color-accent);
}

.site-main {
  flex: 1;
  padding: var(--spacing-lg) var(--spacing-sm);
}

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

.breadcrumbs {
  display: flex;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-lg);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

.breadcrumbs a {
  color: var(--color-text-muted);
}

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

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

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
}

.card:hover {
  box-shadow: 0 8px 24px rgba(67, 56, 202, 0.12);
  border-color: var(--color-primary);
}

.card h3 {
  margin-top: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-md) 0;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

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

table th {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  font-weight: 600;
}

table td {
  padding: var(--spacing-sm) var(--spacing-md);
  border-top: 1px solid var(--color-border);
}

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

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

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

details {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-sm);
  margin: var(--spacing-sm) 0;
  position: relative;
  left: 1rem;
}

summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--color-secondary);
  padding: var(--spacing-xs);
  list-style: none;
  transition: color 0.2s ease;
  user-select: none;
}

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

summary::before {
  content: '▶';
  display: inline-block;
  margin-right: var(--spacing-xs);
  transition: transform 0.2s ease;
}

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

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

summary:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius);
}

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

.site-footer {
  background: var(--color-secondary);
  color: var(--color-accent);
  padding: var(--spacing-lg) var(--spacing-sm);
  margin-top: var(--spacing-xl);
  position: relative;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -2rem;
  left: 0;
  right: 0;
  height: 2rem;
  background: linear-gradient(to bottom, transparent, rgba(49, 46, 129, 0.1));
}

.site-footer .container {
  display: grid;
  gap: var(--spacing-lg);
}

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

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

.site-footer h3 {
  color: var(--color-bg);
  font-size: 1.125rem;
  margin-bottom: var(--spacing-sm);
}

.site-footer p {
  font-size: 0.875rem;
  color: var(--color-accent);
}

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

  h2 {
    font-size: 2.25rem;
  }

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

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

  .site-nav {
    gap: var(--spacing-lg);
  }

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

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

  blockquote {
    padding: var(--spacing-lg);
    left: -1rem;
  }

  details {
    left: 2rem;
  }
}

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

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

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

  .card:nth-child(odd) {
    transform: translateX(-1rem);
  }

  .card:nth-child(even) {
    transform: translateX(1rem);
  }

  .card::before {
    content: '';
    position: absolute;
    top: -0.5rem;
    right: -0.5rem;
    width: 100%;
    height: 100%;
    background: var(--color-accent);
    border-radius: var(--radius);
    z-index: -1;
    opacity: 0;
    transition: opacity 0.2s ease;
  }

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

  table {
    box-shadow: 0 4px 12px rgba(67, 56, 202, 0.08);
  }

  blockquote {
    margin-left: var(--spacing-md);
    left: -2rem;
  }
}

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

  summary::before {
    transition: none;
  }

  .card::before {
    transition: none;
  }
}

@media print {
  .site-header {
    position: static;
    box-shadow: none;
  }

  .site-nav {
    display: none;
  }

  .site-footer {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
  }

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

  .container {
    max-width: 100%;
  }

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

  .card:nth-child(odd),
  .card:nth-child(even) {
    transform: none;
  }

  a {
    text-decoration: underline;
  }

  table {
    page-break-inside: avoid;
  }

  .breadcrumbs {
    display: none;
  }
}