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

: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: 0px;
}

body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image: 
    linear-gradient(135deg, var(--color-surface) 25%, transparent 25%),
    linear-gradient(225deg, var(--color-surface) 25%, transparent 25%),
    linear-gradient(45deg, var(--color-surface) 25%, transparent 25%),
    linear-gradient(315deg, var(--color-surface) 25%, transparent 25%);
  background-position: 40px 0, 40px 0, 0 0, 0 0;
  background-size: 80px 80px;
  background-repeat: repeat;
}

h1 {
  font-size: 2.5rem;
  line-height: 1.2;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
  position: relative;
  padding-bottom: 1rem;
}

h1::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
  clip-path: polygon(0 0, 95% 0, 100% 100%, 0% 100%);
}

h2 {
  font-size: 2rem;
  line-height: 1.3;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1.25rem;
  margin-top: 2.5rem;
  position: relative;
  padding-left: 1.5rem;
}

h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.25rem;
  width: 6px;
  height: calc(100% - 0.5rem);
  background: var(--color-accent);
  clip-path: polygon(0 0, 100% 5%, 100% 95%, 0 100%);
}

h3 {
  font-size: 1.5rem;
  line-height: 1.4;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 1rem;
  margin-top: 2rem;
  font-family: 'Courier New', 'Courier', monospace;
}

h4 {
  font-size: 1.25rem;
  line-height: 1.4;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.75rem;
  margin-top: 1.5rem;
}

h5 {
  font-size: 1.1rem;
  line-height: 1.5;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.5rem;
  margin-top: 1.25rem;
}

h6 {
  font-size: 1rem;
  line-height: 1.5;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
  margin-top: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

p {
  margin-bottom: 1.25rem;
}

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: 3px solid var(--color-accent);
  outline-offset: 2px;
}

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

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

blockquote {
  margin: 2rem 0;
  padding: 1.5rem 1.5rem 1.5rem 2rem;
  background: var(--color-surface);
  border-left: 6px solid var(--color-primary);
  position: relative;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

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

.site-header {
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-primary) 100%);
  color: var(--color-bg);
  padding: 2rem 1.5rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), 0 100%);
  margin-bottom: 30px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.site-header h1 {
  color: var(--color-bg);
  margin: 0;
  padding: 0;
  font-family: 'Courier New', 'Courier', monospace;
  letter-spacing: 0.05em;
}

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

.site-header a {
  color: var(--color-bg);
  border-bottom-color: transparent;
}

.site-header a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.site-nav {
  background: var(--color-surface);
  padding: 0;
  margin: -30px 0 2rem 0;
  position: relative;
  clip-path: polygon(0 30px, 100% 0, 100% 100%, 0 100%);
  padding-top: 30px;
}

.site-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.site-nav li {
  position: relative;
}

.site-nav a {
  display: block;
  padding: 1rem 1.5rem;
  color: var(--color-text);
  font-weight: 600;
  border-bottom: 3px solid transparent;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  font-family: 'Courier New', 'Courier', monospace;
}

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

.site-main {
  min-height: 60vh;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 3rem 1.5rem;
  background: var(--color-bg);
  box-shadow: 0 0 0 1px var(--color-border);
  position: relative;
}

.container::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 40px 40px 0;
  border-color: transparent var(--color-surface) transparent transparent;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
  padding: 1rem;
  background: var(--color-surface);
  font-size: 0.875rem;
  flex-wrap: wrap;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}

.breadcrumbs a {
  color: var(--color-text-muted);
  border: none;
}

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

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

.card {
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 15px), calc(100% - 15px) 100%, 0 100%);
}

.card:hover {
  box-shadow: 0 8px 16px rgba(51, 65, 85, 0.15);
  border-color: var(--color-primary);
}

.card h3 {
  margin-top: 0;
}

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

table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 2rem 0;
  background: 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: 1rem;
  text-align: left;
  font-weight: 700;
  font-family: 'Courier New', 'Courier', monospace;
  letter-spacing: 0.05em;
  border-bottom: 3px solid var(--color-accent);
}

table td {
  padding: 0.875rem 1rem;
  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: rgba(148, 163, 184, 0.1);
}

details {
  margin: 1.5rem 0;
  border: 2px solid var(--color-border);
  background: var(--color-bg);
  position: relative;
  clip-path: polygon(10px 0, 100% 0, 100% 100%, 0 100%, 0 10px);
}

details::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 10px 0 0;
  border-color: var(--color-accent) transparent transparent transparent;
}

summary {
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-surface);
  transition: background-color 0.2s ease, color 0.2s ease;
  user-select: none;
  font-family: 'Courier New', 'Courier', monospace;
}

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

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

details[open] summary {
  border-bottom: 2px solid var(--color-border);
  background: var(--color-primary);
  color: var(--color-bg);
}

details > *:not(summary) {
  padding: 1.5rem;
  animation: slideDown 0.2s ease;
}

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

.site-footer {
  background: var(--color-secondary);
  color: var(--color-accent);
  padding: 3rem 1.5rem 2rem 1.5rem;
  margin-top: 4rem;
  clip-path: polygon(0 30px, 100% 0, 100% 100%, 0 100%);
  position: relative;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 50%, var(--color-primary) 100%);
}

.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);
}

.site-footer p {
  text-align: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: 30px;
}

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

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

@media (max-width: 767px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  .site-nav ul {
    flex-direction: column;
    gap: 0;
  }

  .site-nav a {
    border-left: 3px solid transparent;
    border-bottom: 1px solid var(--color-border);
  }

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

  table {
    font-size: 0.8rem;
  }

  table th,
  table td {
    padding: 0.5rem;
  }
}

@media (min-width: 768px) {
  body {
    font-size: 17px;
  }

  .container {
    padding: 2rem 3rem 4rem 3rem;
  }

  .site-header {
    padding: 3rem 2rem;
  }

  .card {
    padding: 2rem;
  }
}

@media (min-width: 1024px) {
  body {
    font-size: 18px;
  }

  h1 {
    font-size: 3rem;
  }

  h2 {
    font-size: 2.25rem;
  }

  .site-nav ul {
    gap: 0;
  }

  .container {
    padding: 3rem 4rem 5rem 4rem;
  }

  .card {
    display: grid;
    gap: 1.5rem;
  }
}

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

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

@media print {
  body {
    background: white;
    background-image: none;
  }

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

  .site-header {
    clip-path: none;
    padding: 1rem;
    margin-bottom: 1rem;
  }

  .container {
    max-width: 100%;
    padding: 0;
    box-shadow: none;
    border: none;
  }

  .container::before {
    display: none;
  }

  .card {
    break-inside: avoid;
    clip-path: none;
    page-break-inside: avoid;
  }

  details {
    clip-path: none;
  }

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

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

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