* {
  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: 4rem;
  --spacing-xl: 6rem;
}

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

body {
  font-family: var(--font-main);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

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: 3rem;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
  position: relative;
  padding-left: 1.5rem;
}

h1::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5rem;
  width: 6px;
  height: 60%;
  background-color: var(--color-primary);
  border-radius: 3px;
}

h2 {
  font-size: 2.25rem;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

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

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

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

h6 {
  font-size: 1.125rem;
  margin-top: var(--spacing-sm);
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
}

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

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

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

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

blockquote {
  margin: var(--spacing-md) 0;
  padding: var(--spacing-md);
  padding-left: var(--spacing-md);
  background-color: var(--color-surface);
  border-left: 5px solid var(--color-primary);
  font-style: italic;
  color: var(--color-text-muted);
  position: relative;
  transform: translateX(1rem);
}

blockquote::before {
  content: '"';
  font-size: 4rem;
  color: var(--color-accent);
  position: absolute;
  top: -1rem;
  left: 1rem;
  line-height: 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) 0;
  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: var(--spacing-sm);
}

.site-header h1 {
  font-size: 1.5rem;
  margin: 0;
  padding-left: 0;
}

.site-header h1::before {
  display: none;
}

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

.site-nav a {
  font-weight: 600;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius);
  transition: color 0.2s ease, background-color 0.2s ease;
}

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

.site-main {
  min-height: 70vh;
  padding: var(--spacing-xl) 0;
}

.site-footer {
  background-color: var(--color-secondary);
  color: var(--color-accent);
  padding: var(--spacing-lg) 0;
  margin-top: var(--spacing-xl);
  position: relative;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -40px;
  left: 10%;
  width: 80%;
  height: 80px;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  z-index: -1;
}

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

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

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

.breadcrumbs {
  display: flex;
  gap: var(--spacing-xs);
  align-items: center;
  margin-bottom: var(--spacing-md);
  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::after {
  content: '/';
  margin: 0 var(--spacing-xs);
  color: var(--color-border);
}

.breadcrumbs:last-child::after {
  display: none;
}

.card {
  background-color: var(--color-surface);
  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;
  overflow: hidden;
}

.card::after {
  content: '';
  position: absolute;
  top: 0;
  right: -50px;
  width: 100px;
  height: 100%;
  background: linear-gradient(135deg, transparent, var(--color-accent));
  opacity: 0.3;
  transform: skewX(-15deg);
}

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

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

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;
}

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

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

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);
}

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

details:hover {
  border-color: var(--color-primary);
}

details[open] {
  box-shadow: 0 4px 12px rgba(67, 56, 202, 0.1);
}

summary {
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  font-weight: 600;
  color: var(--color-primary);
  list-style: none;
  transition: background-color 0.2s ease, color 0.2s ease;
  user-select: none;
  position: relative;
  padding-left: calc(var(--spacing-md) + 1.5rem);
}

summary::before {
  content: '▶';
  position: absolute;
  left: var(--spacing-md);
  transition: transform 0.2s ease;
}

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

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

details > *:not(summary) {
  padding: var(--spacing-md);
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

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

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

code {
  background-color: var(--color-surface);
  color: var(--color-primary);
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  font-size: 0.9em;
}

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

pre code {
  background-color: transparent;
  padding: 0;
}

button, input[type="submit"] {
  background-color: var(--color-primary);
  color: var(--color-bg);
  border: none;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius);
  font-family: var(--font-main);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

button:hover, input[type="submit"]:hover {
  background-color: var(--color-secondary);
  box-shadow: 0 4px 12px rgba(67, 56, 202, 0.3);
}

button:focus-visible, input[type="submit"]:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

input[type="text"], input[type="email"], input[type="search"], textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-main);
  font-size: 1rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  background-color: var(--color-bg);
}

input[type="text"]:focus, input[type="email"]:focus, input[type="search"]:focus, textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-accent);
}

hr {
  border: none;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-border), transparent);
  margin: var(--spacing-lg) 0;
}

@media (min-width: 768px) {
  h1 {
    font-size: 4rem;
  }

  h2 {
    font-size: 2.75rem;
  }

  h3 {
    font-size: 2rem;
  }

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

  blockquote {
    transform: translateX(2rem);
    max-width: 90%;
  }

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

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

  .site-footer::before {
    top: -60px;
    height: 120px;
  }
}

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

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

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

  .site-main {
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xl);
  }

  blockquote {
    padding: var(--spacing-lg);
    padding-left: var(--spacing-lg);
    transform: translateX(3rem);
    max-width: 85%;
  }

  .card {
    transform: translateX(-2rem);
  }

  .card:nth-child(even) {
    transform: translateX(2rem);
  }

  table {
    font-size: 1rem;
  }

  details > *:not(summary) {
    padding: var(--spacing-lg);
  }
}

@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;
  }

  html {
    scroll-behavior: auto;
  }
}

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

  .site-main {
    padding: 0;
    display: block;
  }

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

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

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

  blockquote {
    page-break-inside: avoid;
    transform: none;
  }

  table {
    page-break-inside: avoid;
  }
}