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

:root {
  --color-primary: #a0522d;
  --color-secondary: #6b3410;
  --color-accent: #f4c89a;
  --color-bg: #fffdf8;
  --color-surface: #fdf5eb;
  --color-text: #3e1d08;
  --color-text-muted: #8d7560;
  --color-border: #ddd0be;
  --font-main: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --max-width: 1100px;
  --radius: 0;
  --spacing-unit: 8px;
  --line-height-base: 1.6;
  --line-height-heading: 1.2;
  --transition-speed: 0.2s;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-main);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: var(--line-height-base);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: var(--line-height-heading);
  margin-bottom: calc(var(--spacing-unit) * 2);
  letter-spacing: -0.02em;
}

h1 {
  font-size: 2.5rem;
  text-transform: uppercase;
  border-bottom: 4px solid var(--color-primary);
  padding-bottom: calc(var(--spacing-unit) * 2);
  margin-bottom: calc(var(--spacing-unit) * 3);
}

h2 {
  font-size: 2rem;
  border-left: 6px solid var(--color-secondary);
  padding-left: calc(var(--spacing-unit) * 2);
  margin-top: calc(var(--spacing-unit) * 4);
}

h3 {
  font-size: 1.5rem;
  position: relative;
  padding-bottom: calc(var(--spacing-unit));
}

h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 2px;
  background-color: var(--color-accent);
}

h4 {
  font-size: 1.25rem;
  color: var(--color-secondary);
}

h5 {
  font-size: 1.125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

h6 {
  font-size: 1rem;
  color: var(--color-text-muted);
  font-weight: 600;
}

p {
  margin-bottom: calc(var(--spacing-unit) * 2);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

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

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

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

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

blockquote {
  margin: calc(var(--spacing-unit) * 3) 0;
  padding: calc(var(--spacing-unit) * 3);
  background-color: var(--color-surface);
  border-left: 8px solid var(--color-primary);
  font-size: 1.125rem;
  line-height: 1.7;
  position: relative;
}

blockquote::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 40px;
  height: 40px;
  background-color: var(--color-accent);
}

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

.site-header {
  background-color: var(--color-surface);
  border-bottom: 3px solid var(--color-border);
  padding: calc(var(--spacing-unit) * 3) 0;
  position: relative;
}

.site-header::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 200px;
  height: 3px;
  background-color: var(--color-primary);
}

.site-nav {
  display: flex;
  gap: 0;
  list-style: none;
  flex-wrap: wrap;
  border-top: 2px solid var(--color-border);
  border-bottom: 2px solid var(--color-border);
  margin-top: calc(var(--spacing-unit) * 2);
}

.site-nav li {
  border-right: 1px solid var(--color-border);
}

.site-nav li:last-child {
  border-right: none;
}

.site-nav a {
  display: block;
  padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 3);
  border-bottom: none;
  background-color: transparent;
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.875rem;
  letter-spacing: 0.05em;
}

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

.site-main {
  flex: 1;
  padding: calc(var(--spacing-unit) * 4) 0;
}

.site-footer {
  background-color: var(--color-secondary);
  color: var(--color-bg);
  padding: calc(var(--spacing-unit) * 4) 0;
  border-top: 4px solid var(--color-primary);
  margin-top: calc(var(--spacing-unit) * 6);
}

.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 calc(var(--spacing-unit) * 2);
}

.breadcrumbs {
  display: flex;
  gap: calc(var(--spacing-unit));
  list-style: none;
  font-size: 0.875rem;
  margin-bottom: calc(var(--spacing-unit) * 3);
  padding: calc(var(--spacing-unit) * 2);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: calc(var(--spacing-unit));
}

.breadcrumbs li::after {
  content: '→';
  color: var(--color-text-muted);
  font-weight: bold;
}

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

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

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

.card {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  padding: calc(var(--spacing-unit) * 3);
  margin-bottom: calc(var(--spacing-unit) * 3);
  position: relative;
  transition: box-shadow var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 6px;
  height: 100%;
  background-color: var(--color-accent);
}

.card:hover {
  border-color: var(--color-primary);
  box-shadow: 4px 4px 0 var(--color-border);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: calc(var(--spacing-unit) * 3) 0;
  background-color: var(--color-bg);
  border: 2px solid var(--color-border);
}

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

table th {
  padding: calc(var(--spacing-unit) * 2);
  text-align: left;
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  border-right: 1px solid var(--color-primary);
}

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

table td {
  padding: calc(var(--spacing-unit) * 2);
  border-bottom: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
}

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

table tbody tr {
  transition: background-color var(--transition-speed) ease;
}

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

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

details {
  margin: calc(var(--spacing-unit) * 2) 0;
  border: 2px solid var(--color-border);
  background-color: var(--color-surface);
}

summary {
  padding: calc(var(--spacing-unit) * 2);
  cursor: pointer;
  font-weight: 700;
  background-color: var(--color-bg);
  border-bottom: 2px solid var(--color-border);
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
  list-style: none;
  position: relative;
  padding-left: calc(var(--spacing-unit) * 5);
}

summary::before {
  content: '▶';
  position: absolute;
  left: calc(var(--spacing-unit) * 2);
  transition: transform var(--transition-speed) ease;
}

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

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

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

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

details > *:not(summary) {
  padding: calc(var(--spacing-unit) * 2);
}

input[type="text"],
input[type="email"],
input[type="search"],
input[type="tel"],
input[type="url"],
input[type="number"],
textarea,
select {
  width: 100%;
  padding: calc(var(--spacing-unit) * 2);
  border: 2px solid var(--color-border);
  background-color: var(--color-bg);
  font-family: var(--font-main);
  font-size: 1rem;
  color: var(--color-text);
  transition: border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="search"]:focus,
input[type="tel"]:focus,
input[type="url"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 4px 4px 0 var(--color-accent);
}

button,
.button {
  display: inline-block;
  padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 4);
  background-color: var(--color-primary);
  color: var(--color-bg);
  border: 2px solid var(--color-primary);
  font-family: var(--font-main);
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
  position: relative;
}

button:hover,
.button:hover {
  background-color: var(--color-secondary);
  border-color: var(--color-secondary);
  box-shadow: 4px 4px 0 var(--color-border);
  border-bottom-color: var(--color-secondary);
}

button:focus-visible,
.button:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 4px;
}

hr {
  border: none;
  height: 2px;
  background-color: var(--color-border);
  margin: calc(var(--spacing-unit) * 4) 0;
  position: relative;
}

hr::after {
  content: '';
  position: absolute;
  top: -4px;
  left: 50%;
  transform: translateX(-50%);
  width: 10px;
  height: 10px;
  background-color: var(--color-primary);
}

ul, ol {
  margin-left: calc(var(--spacing-unit) * 3);
  margin-bottom: calc(var(--spacing-unit) * 2);
}

ul li, ol li {
  margin-bottom: calc(var(--spacing-unit));
  padding-left: calc(var(--spacing-unit));
}

code {
  font-family: 'Courier New', monospace;
  background-color: var(--color-surface);
  padding: calc(var(--spacing-unit) / 2) calc(var(--spacing-unit));
  border: 1px solid var(--color-border);
  font-size: 0.9em;
}

pre {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-left: 6px solid var(--color-primary);
  padding: calc(var(--spacing-unit) * 2);
  overflow-x: auto;
  margin: calc(var(--spacing-unit) * 3) 0;
}

pre code {
  border: none;
  padding: 0;
  background: transparent;
}

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

  h2 {
    font-size: 2.25rem;
  }

  h3 {
    font-size: 1.75rem;
  }

  .site-header {
    padding: calc(var(--spacing-unit) * 4) 0;
  }

  .site-nav {
    margin-top: calc(var(--spacing-unit) * 3);
  }

  .site-main {
    padding: calc(var(--spacing-unit) * 6) 0;
  }

  .container {
    padding: 0 calc(var(--spacing-unit) * 4);
  }

  .card {
    padding: calc(var(--spacing-unit) * 4);
  }

  blockquote {
    padding: calc(var(--spacing-unit) * 4);
    margin: calc(var(--spacing-unit) * 4) 0;
  }
}

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

  h2 {
    font-size: 2.5rem;
  }

  .site-nav {
    flex-wrap: nowrap;
  }

  .site-footer {
    padding: calc(var(--spacing-unit) * 6) 0;
  }
}

@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-nav,
  .breadcrumbs,
  button,
  .button {
    display: none;
  }

  .site-header {
    border-bottom: 2px solid #000;
  }

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

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

  a {
    color: #000;
    text-decoration: underline;
  }

  .card {
    border: 1px solid #000;
    box-shadow: none;
    page-break-inside: avoid;
  }

  table {
    border: 1px solid #000;
  }

  table thead {
    background-color: #ccc;
    color: #000;
  }
}