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

:root {
  --color-primary: #334155;
  --color-secondary: #0f172a;
  --color-accent: #94a3b8;
  --color-bg: #ffffff;
  --color-surface: #f1f5f9;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-border: #cbd5e1;
  --font-main: 'Verdana', 'Geneva', 'Tahoma', sans-serif;
  --max-width: 1100px;
  --radius: 0;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --transition: 0.2s ease;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  font-size: 1rem;
  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);
  letter-spacing: -0.02em;
}

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

h1::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 80px;
  height: 4px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  clip-path: polygon(0 0, 95% 0, 100% 100%, 5% 100%);
}

h2 {
  font-size: 2rem;
  margin-top: var(--spacing-lg);
  position: relative;
  padding-left: var(--spacing-md);
}

h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  background: var(--color-primary);
  clip-path: polygon(0 0, 100% 5%, 100% 95%, 0 100%);
}

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

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

a {
  color: var(--color-primary);
  text-decoration: none;
  position: relative;
  transition: color var(--transition);
}

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

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 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) var(--spacing-lg);
  background: var(--color-surface);
  border-left: 6px solid var(--color-primary);
  position: relative;
  font-style: italic;
  color: var(--color-text-muted);
}

blockquote::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 30px 30px 0;
  border-color: transparent var(--color-accent) transparent transparent;
}

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

.site-header {
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-primary) 100%);
  color: var(--color-bg);
  padding: var(--spacing-lg) var(--spacing-md);
  position: relative;
  clip-path: polygon(0 0, 100% 0, 100% 85%, 0 100%);
  padding-bottom: calc(var(--spacing-lg) + 20px);
}

.site-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
}

.site-nav {
  background-color: var(--color-surface);
  border-bottom: 2px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 90%);
  padding-bottom: 10px;
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 0;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  flex-wrap: wrap;
}

.site-nav li {
  position: relative;
}

.site-nav a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text);
  font-weight: 600;
  transition: background-color var(--transition), color var(--transition);
  position: relative;
  clip-path: polygon(5% 0, 100% 0, 95% 100%, 0 100%);
  margin: 0 2px;
}

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

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

.site-nav a:hover::after {
  width: 80%;
  left: 10%;
}

.site-main {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
  width: 100%;
}

.site-footer {
  background-color: var(--color-secondary);
  color: var(--color-bg);
  padding: var(--spacing-xl) var(--spacing-md) var(--spacing-lg);
  margin-top: var(--spacing-xl);
  position: relative;
  clip-path: polygon(0 10%, 100% 0, 100% 100%, 0 100%);
  padding-top: calc(var(--spacing-xl) + 20px);
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
}

.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);
}

.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);
  font-family: 'Courier New', monospace;
}

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

.breadcrumbs::before {
  content: '>';
  color: var(--color-accent);
  font-family: 'Courier New', monospace;
  font-weight: 700;
}

.card {
  background-color: var(--color-bg);
  border: 2px solid var(--color-border);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  transition: box-shadow var(--transition), border-color var(--transition);
  position: relative;
}

.card::before {
  content: '';
  position: absolute;
  top: -2px;
  right: -2px;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 20px 20px 0;
  border-color: transparent var(--color-accent) transparent transparent;
  transition: border-width var(--transition);
}

.card:hover {
  box-shadow: 8px 8px 0 var(--color-surface);
  border-color: var(--color-primary);
}

.card:hover::before {
  border-width: 0 30px 30px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-md) 0;
  background-color: var(--color-bg);
  border: 2px solid var(--color-border);
  font-size: 0.9rem;
}

table thead {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-bg);
}

table th {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  font-weight: 700;
  border: 1px solid var(--color-secondary);
  position: relative;
}

table th::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
}

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

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

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

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

details {
  margin: var(--spacing-md) 0;
  border: 2px solid var(--color-border);
  background-color: var(--color-bg);
  position: relative;
}

details::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--color-accent);
  transition: width var(--transition);
}

details[open]::before {
  width: 8px;
  background: var(--color-primary);
}

summary {
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  font-weight: 700;
  color: var(--color-primary);
  user-select: none;
  transition: background-color var(--transition), color var(--transition);
  list-style: none;
  position: relative;
  padding-left: calc(var(--spacing-md) + 20px);
}

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

summary::before {
  content: '▶';
  position: absolute;
  left: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%) rotate(0deg);
  transition: transform var(--transition);
  color: var(--color-accent);
  font-size: 0.75rem;
}

details[open] summary::before {
  transform: translateY(-50%) rotate(90deg);
}

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

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

details > *:not(summary) {
  padding: var(--spacing-md);
  border-top: 2px solid var(--color-border);
}

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

  h2 {
    font-size: 2.25rem;
  }

  h3 {
    font-size: 1.75rem;
  }

  .site-header {
    padding: var(--spacing-xl) var(--spacing-lg);
    clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
  }

  .site-nav ul {
    padding: 0 var(--spacing-lg);
  }

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

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

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

  table {
    font-size: 1rem;
  }
}

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

  h2 {
    font-size: 2.5rem;
  }

  .site-header {
    clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
  }

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

  .card::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: -2px;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 0 15px 15px;
    border-color: transparent transparent var(--color-surface) transparent;
    transition: border-width var(--transition);
  }

  .card:hover::after {
    border-width: 0 0 25px 25px;
  }
}

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

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

  .site-header {
    clip-path: none;
    padding-bottom: var(--spacing-lg);
  }

  .site-footer {
    clip-path: none;
    padding-top: var(--spacing-xl);
  }

  .site-main {
    max-width: 100%;
    padding: var(--spacing-md);
  }

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

  .card::before,
  .card::after {
    display: none;
  }

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

  details[open] summary {
    display: none;
  }

  details > *:not(summary) {
    border: none;
    padding: 0;
  }
}