* {
  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;
}

body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.7;
  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: 600;
  line-height: 1.3;
  color: var(--color-secondary);
  margin-bottom: var(--spacing-sm);
}

h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
  position: relative;
  padding-left: 0.75rem;
}

h1::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.25rem;
  bottom: 0.25rem;
  width: 4px;
  background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
  border-radius: 2px;
}

h2 {
  font-size: 2rem;
  margin-top: var(--spacing-lg);
  transform: translateX(-0.5rem);
}

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

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

h5 {
  font-size: 1.1rem;
  margin-top: var(--spacing-sm);
}

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

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, background-color 0.2s ease;
  position: relative;
}

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

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

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

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

blockquote {
  margin: var(--spacing-md) 0;
  padding: var(--spacing-md);
  padding-left: var(--spacing-lg);
  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);
  box-shadow: 0 2px 8px rgba(67, 56, 202, 0.08);
}

blockquote::before {
  content: '"';
  font-size: 4rem;
  position: absolute;
  left: 1rem;
  top: 0.5rem;
  color: var(--color-accent);
  opacity: 0.5;
  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) var(--spacing-sm);
  position: relative;
  z-index: 100;
}

.site-header::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 5%;
  width: 30%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), transparent);
}

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

.site-nav ul {
  list-style: none;
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.site-nav a {
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-bottom: none;
  border-radius: var(--radius);
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  position: relative;
}

.breadcrumbs {
  display: flex;
  gap: var(--spacing-xs);
  align-items: center;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
  transform: translateX(-1rem);
  padding-left: var(--spacing-sm);
}

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

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

.breadcrumbs::before {
  content: '';
  width: 3px;
  height: 1.2em;
  background-color: var(--color-accent);
  margin-right: var(--spacing-xs);
}

.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: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent), var(--color-primary));
}

.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);
}

.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, transform 0.2s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -2px;
  width: 4px;
  height: 0;
  background-color: var(--color-primary);
  transition: height 0.2s ease;
}

.card:hover {
  box-shadow: 0 8px 24px rgba(67, 56, 202, 0.12);
  transform: translateY(-2px) translateX(4px);
}

.card:hover::before {
  height: 100%;
}

.card h3 {
  margin-top: 0;
  transform: translateX(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;
  box-shadow: 0 2px 8px rgba(67, 56, 202, 0.06);
  transform: translateX(0.5rem);
}

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: 600;
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
}

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-color: var(--color-surface);
}

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

table tbody tr:hover td {
  color: var(--color-secondary);
}

details {
  margin: var(--spacing-md) 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--color-bg);
  transition: box-shadow 0.2s ease;
}

details[open] {
  box-shadow: 0 4px 16px rgba(67, 56, 202, 0.1);
  border-color: var(--color-primary);
}

summary {
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-surface);
  cursor: pointer;
  font-weight: 600;
  color: var(--color-secondary);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  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;
  color: var(--color-primary);
}

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

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

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

details[open] summary {
  background-color: var(--color-primary);
  color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

details[open] summary::before {
  color: var(--color-accent);
}

details > *:not(summary) {
  padding: var(--spacing-md);
  animation: slideDown 0.2s ease;
}

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

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

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

ul li::marker {
  color: var(--color-primary);
}

ol li::marker {
  color: var(--color-primary);
  font-weight: 700;
}

code {
  font-family: 'Courier New', monospace;
  background-color: var(--color-surface);
  padding: 0.2em 0.4em;
  border-radius: 3px;
  font-size: 0.9em;
  color: var(--color-secondary);
  border: 1px solid var(--color-border);
}

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);
  transform: translateX(-0.5rem);
}

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

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

hr::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 40px;
  height: 40px;
  background-color: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: 50%;
}

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

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

button:active, input[type="submit"]:active, input[type="button"]:active {
  transform: translateY(0);
}

button:focus-visible, input[type="submit"]:focus-visible, input[type="button"]:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

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

input[type="text"]:focus, input[type="email"]:focus, input[type="search"]:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(67, 56, 202, 0.1);
}

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

  h2 {
    font-size: 2.25rem;
  }

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

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

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

  .container > * {
    grid-column: 1 / -1;
  }

  blockquote {
    grid-column: 2 / -1;
    margin-left: -var(--spacing-md);
  }

  table {
    transform: translateX(1rem);
  }
}

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

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

  .container {
    grid-template-columns: repeat(12, 1fr);
    gap: var(--spacing-md);
  }

  .container > h2 {
    grid-column: 2 / 12;
  }

  .container > p {
    grid-column: 2 / 11;
  }

  .card {
    position: relative;
    left: var(--spacing-sm);
  }

  .card:nth-child(even) {
    left: calc(var(--spacing-sm) * -1);
  }
}

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

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

  .site-main {
    padding: 0;
  }

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

  a {
    color: var(--color-text);
    border-bottom: none;
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: var(--color-text-muted);
  }

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

  table {
    break-inside: avoid;
  }
}