* {
  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: 0;
}

body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image: linear-gradient(to bottom, var(--color-bg), var(--color-surface));
  min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--color-secondary);
  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 4px rgba(0, 0, 0, 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;
}

h5 {
  font-size: 1.25rem;
}

h6 {
  font-size: 1.1rem;
}

p {
  margin-bottom: 1rem;
  max-width: 70ch;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 700;
  border-bottom: 3px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
  padding: 0 0.25rem;
}

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

a:focus-visible {
  outline: 4px solid var(--color-accent);
  outline-offset: 2px;
}

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

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

blockquote {
  border-left: 8px solid var(--color-accent);
  background: linear-gradient(to right, var(--color-surface), var(--color-bg));
  padding: 1.5rem 2rem;
  margin: 2rem 0;
  font-size: 1.1rem;
  font-style: italic;
  color: var(--color-primary);
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.05);
  border-top: 3px solid var(--color-border);
  border-bottom: 3px solid var(--color-border);
}

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

.site-header {
  background: var(--color-secondary);
  border-bottom: 8px solid var(--color-primary);
  padding: 2rem 1rem;
  box-shadow: inset 0 -4px 8px rgba(0, 0, 0, 0.2), 0 4px 12px rgba(0, 0, 0, 0.15);
  position: relative;
}

.site-header::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  right: 0;
  height: 8px;
  background: linear-gradient(to right, var(--color-accent), var(--color-primary));
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
  justify-content: center;
}

.site-nav a {
  background: var(--color-primary);
  color: var(--color-bg);
  padding: 0.75rem 1.5rem;
  border: 4px solid var(--color-bg);
  font-weight: 800;
  text-transform: uppercase;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.2);
  border-bottom: 4px solid var(--color-bg);
}

.site-nav a:hover {
  background: var(--color-accent);
  color: var(--color-secondary);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.3);
  transform: translate(-2px, -2px);
  border-color: var(--color-secondary);
}

.site-main {
  flex: 1;
  padding: 3rem 1rem;
}

.site-footer {
  background: var(--color-secondary);
  color: var(--color-surface);
  padding: 3rem 1rem 2rem;
  border-top: 8px solid var(--color-accent);
  margin-top: 4rem;
  box-shadow: inset 0 4px 8px rgba(0, 0, 0, 0.2);
}

.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 1rem;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
  padding: 1rem;
  background: var(--color-surface);
  border: 3px solid var(--color-border);
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.08);
  font-size: 0.9rem;
}

.breadcrumbs a {
  color: var(--color-primary);
  font-weight: 600;
}

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

.card {
  background: var(--color-bg);
  border: 5px solid var(--color-secondary);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.1), inset 0 2px 4px rgba(0, 0, 0, 0.05);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
  background-image: linear-gradient(to bottom right, var(--color-bg), var(--color-surface));
}

.card:hover {
  box-shadow: 12px 12px 0 rgba(0, 0, 0, 0.15), inset 0 2px 6px rgba(0, 0, 0, 0.08);
  border-color: var(--color-accent);
}

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 rgba(0, 0, 0, 0.1);
}

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

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

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

td {
  padding: 1rem;
  border-bottom: 2px solid var(--color-border);
  border-right: 2px solid var(--color-border);
  transition: background-color 0.2s ease;
}

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

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

tbody tr:nth-child(even) {
  background: var(--color-bg);
}

tbody tr:hover {
  background: linear-gradient(to right, var(--color-surface), var(--color-bg));
  box-shadow: inset 0 0 0 3px var(--color-accent);
}

details {
  border: 4px solid var(--color-primary);
  padding: 1rem;
  margin-bottom: 1rem;
  background: var(--color-surface);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.06);
}

summary {
  font-weight: 800;
  cursor: pointer;
  padding: 0.75rem;
  margin: -1rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: var(--color-bg);
  border-bottom: 4px solid var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
  list-style: none;
}

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

summary::before {
  content: '▶ ';
  display: inline-block;
  transition: transform 0.2s ease;
  font-size: 0.8em;
}

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

summary:hover {
  background: var(--color-accent);
  color: var(--color-secondary);
  box-shadow: inset 0 -3px 6px rgba(0, 0, 0, 0.2);
}

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

details[open] summary {
  margin-bottom: 1rem;
  border-bottom-color: var(--color-secondary);
}

details > *:not(summary) {
  padding-top: 1rem;
}

button, input[type="submit"], input[type="button"] {
  font-family: var(--font-main);
  font-weight: 800;
  text-transform: uppercase;
  padding: 1rem 2rem;
  background: var(--color-accent);
  color: var(--color-secondary);
  border: 4px solid var(--color-secondary);
  cursor: pointer;
  font-size: 1rem;
  letter-spacing: 0.05em;
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.2);
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

button:hover, input[type="submit"]:hover, input[type="button"]:hover {
  background: var(--color-secondary);
  color: var(--color-bg);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.3);
  transform: translate(-2px, -2px);
}

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

input[type="text"], input[type="email"], input[type="tel"], input[type="url"], input[type="search"], textarea, select {
  font-family: var(--font-main);
  font-size: 1rem;
  padding: 0.75rem;
  border: 4px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
  width: 100%;
  max-width: 100%;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

input[type="text"]:focus, input[type="email"]:focus, input[type="tel"]:focus, input[type="url"]:focus, input[type="search"]:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.08), 0 0 0 4px rgba(56, 189, 248, 0.2);
}

textarea {
  min-height: 150px;
  resize: vertical;
}

label {
  display: block;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--color-secondary);
  text-transform: uppercase;
  font-size: 0.9rem;
  letter-spacing: 0.03em;
}

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

  h2 {
    font-size: 2.75rem;
  }

  h3 {
    font-size: 2rem;
  }

  .site-nav {
    justify-content: flex-start;
  }

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

  .card {
    padding: 2.5rem;
  }

  .container {
    padding: 0 2rem;
  }

  table {
    font-size: 1rem;
  }
}

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

  h1 {
    font-size: 5rem;
    padding: 2rem;
  }

  h2 {
    font-size: 3rem;
  }

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

  .site-nav {
    gap: 1rem;
  }

  .site-nav a {
    padding: 1rem 2rem;
    font-size: 1rem;
  }

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

  .site-footer {
    padding: 4rem 2rem 3rem;
  }

  .card {
    padding: 3rem;
  }

  blockquote {
    padding: 2rem 3rem;
    font-size: 1.25rem;
  }

  details {
    padding: 1.5rem;
  }

  summary {
    padding: 1rem;
    margin: -1.5rem;
  }

  details[open] summary {
    margin-bottom: 1.5rem;
  }
}

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

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

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

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

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

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

  body {
    background: var(--color-bg);
    background-image: none;
  }

  h1, h2, h3, h4, h5, h6 {
    page-break-after: avoid;
  }

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

  details {
    border: 2px solid var(--color-border);
  }

  summary::before {
    content: '';
  }
}