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

:root {
  --color-primary: #475569;
  --color-secondary: #1e293b;
  --color-accent: #38bdf8;
  --color-bg: #ffffff;
  --color-surface: #f8fafc;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --font-main: 'Trebuchet MS', 'Lucida Sans', 'Lucida Grande', sans-serif;
  --max-width: 1100px;
  --radius: 0px;
}

body {
  font-family: var(--font-main);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  font-size: 16px;
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-surface) 100%);
  min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-secondary);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: -0.02em;
}

h1 {
  font-size: 3rem;
  border: 6px solid var(--color-secondary);
  padding: 1.5rem;
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-bg) 100%);
  box-shadow: inset 0 2px 8px rgba(15, 23, 42, 0.1);
  margin-bottom: 2rem;
}

h2 {
  font-size: 2.25rem;
  border-left: 8px solid var(--color-accent);
  padding-left: 1rem;
  margin-top: 2rem;
}

h3 {
  font-size: 1.75rem;
  border-bottom: 4px solid var(--color-primary);
  padding-bottom: 0.5rem;
  display: inline-block;
}

h4 {
  font-size: 1.5rem;
  color: var(--color-primary);
}

h5 {
  font-size: 1.25rem;
  color: var(--color-primary);
}

h6 {
  font-size: 1rem;
  color: var(--color-text-muted);
}

p {
  margin-bottom: 1.25rem;
  max-width: 70ch;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 700;
  border-bottom: 3px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
  padding: 0 2px;
}

a:hover {
  border-bottom-color: var(--color-accent);
  background-color: rgba(56, 189, 248, 0.1);
}

a:focus-visible {
  outline: 4px solid var(--color-accent);
  outline-offset: 2px;
  background-color: rgba(56, 189, 248, 0.15);
}

strong {
  font-weight: 800;
  color: var(--color-secondary);
}

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

blockquote {
  border-left: 8px solid var(--color-primary);
  background: var(--color-surface);
  padding: 1.5rem 2rem;
  margin: 2rem 0;
  font-size: 1.125rem;
  font-style: italic;
  color: var(--color-text-muted);
  box-shadow: inset 0 2px 12px rgba(15, 23, 42, 0.08);
  border-top: 3px solid var(--color-border);
  border-bottom: 3px solid var(--color-border);
}

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

.site-header {
  background: var(--color-secondary);
  border-bottom: 8px solid var(--color-accent);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 8px 0 0 var(--color-primary), 0 12px 24px rgba(15, 23, 42, 0.2);
}

.site-nav {
  display: flex;
  gap: 0;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0;
  flex-wrap: wrap;
}

.site-nav a {
  padding: 1.5rem 2rem;
  color: var(--color-bg);
  border-bottom: none;
  border-right: 3px solid var(--color-primary);
  background: var(--color-secondary);
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
  flex: 1;
  text-align: center;
  min-width: 120px;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.site-nav a:hover {
  background: var(--color-accent);
  color: var(--color-secondary);
  box-shadow: inset 0 -4px 0 0 var(--color-secondary);
}

.site-nav a:focus-visible {
  outline: 4px solid var(--color-bg);
  outline-offset: -4px;
  z-index: 1;
}

.site-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem;
  min-height: 60vh;
}

.site-footer {
  background: var(--color-secondary);
  color: var(--color-surface);
  padding: 3rem 1.5rem;
  margin-top: 4rem;
  border-top: 8px solid var(--color-primary);
  box-shadow: inset 0 4px 12px rgba(0, 0, 0, 0.3);
}

.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 1.5rem;
}

.breadcrumbs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding: 1rem 0;
  margin-bottom: 2rem;
  border: 3px solid var(--color-border);
  padding: 1rem 1.5rem;
  background: var(--color-surface);
  box-shadow: inset 0 2px 8px rgba(15, 23, 42, 0.06);
}

.breadcrumbs a {
  color: var(--color-primary);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
}

.breadcrumbs a::after {
  content: '→';
  margin-left: 0.5rem;
  color: var(--color-text-muted);
  font-weight: 700;
}

.breadcrumbs a:last-child::after {
  content: '';
}

.card {
  background: var(--color-bg);
  border: 5px solid var(--color-secondary);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 8px 8px 0 0 var(--color-accent);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
}

.card:hover {
  box-shadow: 12px 12px 0 0 var(--color-accent);
  border-color: var(--color-primary);
}

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

table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 2rem 0;
  border: 4px solid var(--color-secondary);
  background: var(--color-bg);
  box-shadow: 6px 6px 0 0 var(--color-primary);
}

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

table th {
  padding: 1rem;
  text-align: left;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-right: 3px solid var(--color-primary);
  font-size: 0.9rem;
}

table th:last-child {
  border-right: none;
}

table td {
  padding: 1rem;
  border-bottom: 3px solid var(--color-border);
  border-right: 3px solid var(--color-border);
  transition: background-color 0.2s ease;
}

table td:last-child {
  border-right: none;
}

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

table tbody tr:hover {
  background: linear-gradient(90deg, rgba(56, 189, 248, 0.1) 0%, rgba(56, 189, 248, 0.05) 100%);
}

table tbody tr:last-child td {
  border-bottom: none;
}

details {
  border: 4px solid var(--color-primary);
  background: var(--color-surface);
  margin-bottom: 1.5rem;
  box-shadow: inset 0 2px 8px rgba(15, 23, 42, 0.08);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

details:hover {
  border-color: var(--color-accent);
  box-shadow: inset 0 2px 12px rgba(56, 189, 248, 0.12);
}

details[open] {
  border-color: var(--color-secondary);
  box-shadow: 4px 4px 0 0 var(--color-accent);
}

summary {
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  font-weight: 800;
  text-transform: uppercase;
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-bg) 100%);
  border-bottom: 3px solid var(--color-border);
  transition: background-color 0.2s ease, color 0.2s ease;
  color: var(--color-secondary);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 1rem;
}

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

summary::before {
  content: '▶';
  display: inline-block;
  transition: transform 0.2s ease;
  font-size: 0.8em;
  color: var(--color-accent);
  font-weight: 900;
}

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

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

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

summary:focus-visible {
  outline: 4px solid var(--color-accent);
  outline-offset: -4px;
}

details > *:not(summary) {
  padding: 1.5rem;
}

@media (min-width: 768px) {
  h1 {
    font-size: 4rem;
    padding: 2rem;
  }

  h2 {
    font-size: 2.75rem;
  }

  h3 {
    font-size: 2rem;
  }

  .site-main {
    padding: 4rem 2rem;
  }

  .site-nav a {
    font-size: 1rem;
    padding: 1.75rem 2.5rem;
  }

  .card {
    padding: 2.5rem;
  }

  table th, table td {
    padding: 1.25rem;
  }
}

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

  h1 {
    font-size: 4.5rem;
  }

  .site-main {
    padding: 5rem 2rem;
  }

  .card {
    padding: 3rem;
  }

  table {
    box-shadow: 8px 8px 0 0 var(--color-primary);
  }
}

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

  summary::before {
    transition: none;
  }
}

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

  .site-header {
    position: static;
    box-shadow: none;
    border-bottom: 2px solid var(--color-text);
  }

  .site-main {
    max-width: 100%;
    padding: 1rem;
  }

  .card {
    box-shadow: none;
    border: 2px solid var(--color-text);
    page-break-inside: avoid;
  }

  table {
    box-shadow: none;
    border: 2px solid var(--color-text);
  }

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

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

input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="tel"],
input[type="url"],
input[type="number"],
textarea,
select {
  width: 100%;
  padding: 1rem 1.25rem;
  border: 4px solid var(--color-secondary);
  background: var(--color-bg);
  font-family: var(--font-main);
  font-size: 1rem;
  color: var(--color-text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
  box-shadow: inset 0 2px 8px rgba(15, 23, 42, 0.08);
  margin-bottom: 1.5rem;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: inset 0 2px 8px rgba(56, 189, 248, 0.15), 0 0 0 4px rgba(56, 189, 248, 0.2);
  background: var(--color-bg);
}

input:hover,
textarea:hover,
select:hover {
  border-color: var(--color-primary);
}

button,
input[type="submit"],
input[type="button"] {
  background: var(--color-accent);
  color: var(--color-secondary);
  border: 4px solid var(--color-secondary);
  padding: 1rem 2.5rem;
  font-family: var(--font-main);
  font-size: 1rem;
  font-weight: 800;
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  box-shadow: 6px 6px 0 0 var(--color-secondary);
  letter-spacing: 0.05em;
}

button:hover,
input[type="submit"]:hover,
input[type="button"]:hover {
  background: var(--color-secondary);
  color: var(--color-accent);
  box-shadow: 8px 8px 0 0 var(--color-primary);
}

button:focus-visible,
input[type="submit"]:focus-visible,
input[type="button"]:focus-visible {
  outline: 4px solid var(--color-accent);
  outline-offset: 4px;
}

button:active,
input[type="submit"]:active,
input[type="button"]:active {
  box-shadow: 3px 3px 0 0 var(--color-secondary);
  transform: translate(3px, 3px);
}