* {
  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: 18px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  background-image: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 900;
  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%, #ffffff 100%);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.06);
  margin-bottom: 2rem;
}

h2 {
  font-size: 2.25rem;
  border-bottom: 5px solid var(--color-accent);
  padding-bottom: 0.5rem;
  margin-top: 2.5rem;
  background: linear-gradient(to right, var(--color-accent), transparent);
  background-clip: text;
  -webkit-background-clip: text;
}

h3 {
  font-size: 1.75rem;
  border-left: 6px solid var(--color-primary);
  padding-left: 1rem;
  margin-top: 2rem;
}

h4 {
  font-size: 1.5rem;
  margin-top: 1.5rem;
}

h5 {
  font-size: 1.25rem;
  margin-top: 1.25rem;
}

h6 {
  font-size: 1.1rem;
  margin-top: 1rem;
  color: var(--color-primary);
}

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

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

a:hover {
  background-color: var(--color-accent);
  color: var(--color-secondary);
  border-bottom-width: 5px;
}

a:focus-visible {
  outline: 4px solid var(--color-accent);
  outline-offset: 3px;
  background-color: var(--color-surface);
}

strong {
  font-weight: 900;
  color: var(--color-secondary);
}

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

blockquote {
  border-left: 8px solid var(--color-secondary);
  background: var(--color-surface);
  padding: 1.5rem 2rem;
  margin: 2rem 0;
  font-size: 1.1rem;
  font-style: italic;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.08);
  border-top: 3px solid var(--color-border);
  border-bottom: 3px solid var(--color-border);
}

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

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

.site-header {
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-primary) 100%);
  border-bottom: 8px solid var(--color-accent);
  padding: 2rem 1rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15), inset 0 -2px 4px rgba(0, 0, 0, 0.1);
  position: relative;
}

.site-header::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-primary) 50%, var(--color-accent) 100%);
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.site-header h1 {
  color: var(--color-bg);
  border: 5px solid var(--color-accent);
  background: rgba(56, 189, 248, 0.1);
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.2);
  margin: 0;
  font-size: 2.5rem;
  padding: 1rem 1.5rem;
}

.site-nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--color-bg);
  background: var(--color-primary);
  border: 3px solid var(--color-bg);
  border-bottom-width: 5px;
  padding: 0.75rem 1.5rem;
  font-weight: 900;
  text-transform: uppercase;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 4px 0 rgba(0, 0, 0, 0.2);
}

.site-nav a:hover {
  background: var(--color-accent);
  color: var(--color-secondary);
  transform: translateY(-2px);
  box-shadow: 0 6px 0 rgba(0, 0, 0, 0.25);
  border-bottom-width: 5px;
}

.site-nav a:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.2);
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  padding: 1rem;
  background: var(--color-surface);
  border: 3px solid var(--color-border);
  margin-bottom: 2rem;
  font-size: 0.9rem;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

.breadcrumbs a {
  border-bottom-width: 2px;
  padding: 0.25rem 0.5rem;
  font-weight: 700;
}

.breadcrumbs a:hover {
  border-bottom-width: 3px;
}

.breadcrumbs::before {
  content: '🐘';
  font-size: 1.2rem;
  margin-right: 0.5rem;
}

.card {
  background: var(--color-bg);
  border: 5px solid var(--color-secondary);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 8px 8px 0 rgba(30, 41, 59, 0.15), inset 0 2px 4px rgba(0, 0, 0, 0.05);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
  background-image: linear-gradient(135deg, #ffffff 0%, var(--color-surface) 100%);
}

.card:hover {
  box-shadow: 12px 12px 0 rgba(30, 41, 59, 0.2), inset 0 2px 8px rgba(0, 0, 0, 0.08);
  transform: translate(-2px, -2px);
}

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

table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 2rem 0;
  border: 5px solid var(--color-secondary);
  background: var(--color-bg);
  box-shadow: 6px 6px 0 rgba(30, 41, 59, 0.15);
}

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

table th {
  padding: 1rem;
  text-align: left;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 4px solid var(--color-accent);
  font-size: 0.95rem;
}

table td {
  padding: 1rem;
  border-bottom: 2px solid var(--color-border);
}

table tbody tr {
  transition: background-color 0.2s ease;
  background: var(--color-bg);
}

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

table tbody tr:hover {
  background: linear-gradient(90deg, var(--color-surface) 0%, #ffffff 100%);
  box-shadow: inset 0 0 0 2px var(--color-accent);
}

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

details {
  border: 4px solid var(--color-secondary);
  padding: 1.5rem;
  margin: 1.5rem 0;
  background: var(--color-surface);
  box-shadow: 4px 4px 0 rgba(30, 41, 59, 0.1), inset 0 2px 4px rgba(0, 0, 0, 0.05);
  transition: box-shadow 0.2s ease;
}

details[open] {
  box-shadow: 6px 6px 0 rgba(30, 41, 59, 0.15), inset 0 2px 8px rgba(0, 0, 0, 0.08);
  background: linear-gradient(135deg, var(--color-surface) 0%, #ffffff 100%);
}

summary {
  cursor: pointer;
  font-weight: 900;
  font-size: 1.2rem;
  color: var(--color-secondary);
  padding: 0.5rem;
  margin: -0.5rem;
  border-left: 6px solid var(--color-accent);
  padding-left: 1rem;
  user-select: none;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

summary:hover {
  color: var(--color-accent);
  background: rgba(56, 189, 248, 0.1);
  border-left-width: 10px;
}

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

details[open] summary {
  margin-bottom: 1.5rem;
  border-bottom: 3px solid var(--color-border);
  padding-bottom: 1rem;
}

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

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

.site-footer a:hover {
  background-color: var(--color-accent);
  color: var(--color-secondary);
}

.site-footer p {
  color: var(--color-surface);
  max-width: 100%;
}

ul, ol {
  margin: 1.5rem 0;
  padding-left: 2rem;
}

li {
  margin-bottom: 0.75rem;
  padding-left: 0.5rem;
}

ul li {
  list-style: none;
  position: relative;
}

ul li::before {
  content: '▪';
  position: absolute;
  left: -1.5rem;
  color: var(--color-accent);
  font-size: 1.5rem;
  line-height: 1.5rem;
  font-weight: 900;
}

ol li {
  padding-left: 0.5rem;
}

ol li::marker {
  color: var(--color-accent);
  font-weight: 900;
}

code {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  padding: 0.2rem 0.5rem;
  font-family: 'Courier New', monospace;
  font-size: 0.9em;
  color: var(--color-secondary);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.05);
}

pre {
  background: var(--color-surface);
  border: 4px solid var(--color-secondary);
  padding: 1.5rem;
  overflow-x: auto;
  margin: 2rem 0;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.1);
}

pre code {
  border: none;
  padding: 0;
  background: none;
  box-shadow: none;
}

hr {
  border: none;
  border-top: 5px solid var(--color-secondary);
  margin: 3rem 0;
  position: relative;
}

hr::after {
  content: '';
  position: absolute;
  top: -2px;
  left: 0;
  width: 30%;
  height: 5px;
  background: var(--color-accent);
}

button, input[type="submit"], input[type="button"] {
  background: var(--color-accent);
  color: var(--color-secondary);
  border: 4px solid var(--color-secondary);
  padding: 0.75rem 2rem;
  font-family: var(--font-main);
  font-size: 1rem;
  font-weight: 900;
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 5px 5px 0 rgba(30, 41, 59, 0.3);
  letter-spacing: 0.05em;
}

button:hover, input[type="submit"]:hover, input[type="button"]:hover {
  background: var(--color-secondary);
  color: var(--color-accent);
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 rgba(30, 41, 59, 0.4);
}

button:active, input[type="submit"]:active, input[type="button"]:active {
  transform: translate(2px, 2px);
  box-shadow: 3px 3px 0 rgba(30, 41, 59, 0.3);
}

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

input[type="text"], input[type="email"], input[type="search"], input[type="url"], textarea, select {
  width: 100%;
  padding: 0.75rem 1rem;
  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;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.06);
}

input[type="text"]:focus, input[type="email"]:focus, input[type="search"]:focus, input[type="url"]:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2), inset 0 2px 4px rgba(0, 0, 0, 0.06);
}

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

label {
  display: block;
  font-weight: 900;
  margin-bottom: 0.5rem;
  color: var(--color-secondary);
  text-transform: uppercase;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
}

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

  h1 {
    font-size: 3.5rem;
  }

  h2 {
    font-size: 2.5rem;
  }

  .site-nav {
    gap: 1rem;
  }

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

  .card {
    padding: 2.5rem;
  }

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

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

  h1 {
    font-size: 4rem;
  }

  body {
    font-size: 19px;
  }

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

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

  .site-main {
    padding: 0;
  }

  .container {
    max-width: 100%;
  }

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

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

  body {
    background: white;
    background-image: none;
  }
}