* {
  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;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 5rem;
}

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

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

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

h1 {
  font-size: 2.5rem;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-md);
}

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

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

h4 {
  font-size: 1.25rem;
  margin-top: var(--spacing-md);
}

h5 {
  font-size: 1.125rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: var(--spacing-sm);
  max-width: 70ch;
}

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

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

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 {
  background-color: var(--color-surface);
  border-left: 5px solid var(--color-primary);
  padding: var(--spacing-md);
  margin: var(--spacing-md) 0;
  margin-left: var(--spacing-md);
  font-style: italic;
  color: var(--color-text-muted);
  position: relative;
}

blockquote::before {
  content: '';
  position: absolute;
  top: -10px;
  right: var(--spacing-md);
  width: 60px;
  height: 60px;
  background-color: var(--color-accent);
  border-radius: 50%;
  opacity: 0.3;
  z-index: -1;
}

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

.site-header {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) var(--spacing-sm);
  position: relative;
  z-index: 100;
}

.site-header::after {
  content: '';
  position: absolute;
  bottom: -20px;
  right: 10%;
  width: 120px;
  height: 120px;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  transform: rotate(15deg);
  z-index: -1;
}

.site-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.site-nav a {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-bottom: none;
  position: relative;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.site-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 3px;
  background-color: var(--color-primary);
  transition: width 0.2s ease, left 0.2s ease;
}

.site-nav a:hover::after {
  width: 100%;
  left: 0;
}

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

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

.site-footer {
  background-color: 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: -40px;
  left: 15%;
  width: 200px;
  height: 80px;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  transform: skewY(-3deg);
  z-index: -1;
}

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

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

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

.breadcrumbs {
  display: flex;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  padding: var(--spacing-sm);
  background-color: var(--color-surface);
  border-radius: var(--radius);
  transform: translateX(-10px);
}

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

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

.breadcrumbs::before {
  content: '→';
  color: var(--color-primary);
  margin-right: var(--spacing-xs);
}

.card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  box-shadow: 0 2px 8px rgba(67, 56, 202, 0.05);
  transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 150px;
  height: 150px;
  background-color: var(--color-accent);
  border-radius: 50%;
  opacity: 0.15;
  transition: transform 0.2s ease;
}

.card:hover {
  box-shadow: 0 8px 24px rgba(67, 56, 202, 0.12);
  transform: translateY(-4px);
  border-color: var(--color-primary);
}

.card:hover::before {
  transform: scale(1.2);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-md) 0;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(67, 56, 202, 0.05);
}

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

table th {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  font-weight: 700;
  border-bottom: 2px solid var(--color-primary);
}

table td {
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px 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);
  cursor: pointer;
}

details {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  background-color: var(--color-surface);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

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

summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--color-secondary);
  padding: var(--spacing-xs);
  border-radius: var(--radius);
  transition: color 0.2s ease, background-color 0.2s ease;
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

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

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

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

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

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

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

button, input, textarea, select {
  font-family: var(--font-main);
  font-size: 1rem;
}

input[type="text"],
input[type="email"],
input[type="search"],
textarea,
select {
  width: 100%;
  padding: var(--spacing-sm);
  border: 2px solid 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);
  box-shadow: 0 0 0 3px var(--color-accent);
}

button {
  background-color: var(--color-primary);
  color: var(--color-bg);
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: 700;
  transition: background-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

button:hover {
  background-color: var(--color-secondary);
  box-shadow: 0 4px 12px rgba(67, 56, 202, 0.3);
  transform: translateY(-2px);
}

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

@media (min-width: 768px) {
  h1 {
    font-size: 3.5rem;
  }

  h2 {
    font-size: 2.5rem;
  }

  h3 {
    font-size: 1.75rem;
  }

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

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

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

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

  .card {
    transform: translateX(20px);
  }

  .card:nth-child(even) {
    transform: translateX(-20px);
  }

  .card:hover {
    transform: translateX(20px) translateY(-4px);
  }

  .card:nth-child(even):hover {
    transform: translateX(-20px) translateY(-4px);
  }

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

  .breadcrumbs {
    transform: translateX(-20px);
  }
}

@media (min-width: 1024px) {
  h1 {
    font-size: 4rem;
  }

  .site-main {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .site-footer {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
  }

  table {
    font-size: 1rem;
  }

  .card {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }
}

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

@media print {
  .site-nav,
  .breadcrumbs,
  button {
    display: none !important;
  }

  .site-header,
  .site-footer {
    border: none;
    background: none;
  }

  .site-main {
    padding: 0;
  }

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

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

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

  table {
    break-inside: avoid;
  }
}

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

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

hr {
  border: none;
  border-top: 2px solid var(--color-border);
  margin: var(--spacing-lg) 0;
  position: relative;
}

hr::after {
  content: '';
  position: absolute;
  top: -5px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 10px;
  background-color: var(--color-primary);
  border-radius: var(--radius);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
}

code {
  background-color: var(--color-surface);
  color: var(--color-secondary);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.9em;
}

pre {
  background-color: var(--color-surface);
  padding: var(--spacing-md);
  border-radius: var(--radius);
  border-left: 4px solid var(--color-primary);
  overflow-x: auto;
  margin: var(--spacing-md) 0;
}

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