:root {
  --color-bg: #0E1116;
  --color-surface: #151B24;
  --color-text: #E9EEF7;
  --color-muted: #A9B4C7;
  --color-border: #2A3446;
  --color-primary: #1F2A44;
  --color-secondary: #6B2D5C;
  --color-accent: #D7B42C;
  --radius: 0;
  --shadow: 0 4px 0 var(--color-border);
  --space: 1rem;
}

* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-size: clamp(1rem, 2.5vw, 1.125rem);
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 var(--space) 0;
  border-bottom: 4px solid var(--color-accent);
  padding-bottom: 0.5rem;
}

h1 {
  font-size: clamp(1.75rem, 5vw, 2.5rem);
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2rem);
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
}

p {
  margin: 0 0 var(--space) 0;
}

a {
  color: var(--color-accent);
  text-decoration: underline;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-text);
}

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

header {
  background-color: var(--color-surface);
  border-bottom: 4px solid var(--color-border);
  padding: var(--space);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

.nav-brand {
  font-size: 1.5rem;
  color: var(--color-accent);
}

nav ul {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--space);
}

nav a {
  text-decoration: none;
  padding: 0.5rem;
  border: 2px solid transparent;
  transition: border-color 0.2s ease;
}

nav a:hover {
  border-color: var(--color-accent);
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space);
  min-height: calc(100vh - 200px);
}

.breadcrumb {
  list-style: none;
  padding: 0;
  margin: 0 0 calc(var(--space) * 2) 0;
  display: flex;
  gap: 0.5rem;
}

.breadcrumb li:not(:last-child)::after {
  content: ' > ';
  margin-left: 0.5rem;
  color: var(--color-muted);
}

section {
  margin-bottom: calc(var(--space) * 2);
}

.grid-layout {
  display: grid;
  gap: calc(var(--space) * 2);
}

@media (min-width: 1024px) {
  .grid-layout {
    grid-template-columns: 2fr 1fr;
  }
}

aside {
  background-color: var(--color-surface);
  padding: var(--space);
  border: 4px solid var(--color-border);
  box-shadow: var(--shadow);
}

.services-grid {
  display: grid;
  gap: var(--space);
}

@media (min-width: 768px) {
  .services-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
}

.service-block {
  background-color: var(--color-surface);
  padding: var(--space);
  border: 4px solid var(--color-border);
  box-shadow: var(--shadow);
}

.method-grid {
  display: grid;
  gap: var(--space);
}

@media (min-width: 768px) {
  .method-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.method-step {
  background-color: var(--color-surface);
  padding: var(--space);
  border: 4px solid var(--color-border);
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space) 0;
  background-color: var(--color-surface);
  border: 4px solid var(--color-border);
}

caption {
  font-weight: bold;
  margin-bottom: var(--space);
  color: var(--color-accent);
}

th, td {
  padding: 0.75rem;
  text-align: left;
  border: 2px solid var(--color-border);
}

th {
  background-color: var(--color-primary);
  font-weight: bold;
}

tbody tr:nth-child(odd) {
  background: linear-gradient(90deg, var(--color-surface) 0%, rgba(107, 45, 92, 0.1) 100%);
}

tbody tr:nth-child(even) {
  background: linear-gradient(90deg, rgba(31, 42, 68, 0.1) 0%, var(--color-surface) 100%);
}

details {
  background-color: var(--color-surface);
  border: 4px solid var(--color-border);
  margin-bottom: var(--space);
  box-shadow: var(--shadow);
}

summary {
  padding: var(--space);
  cursor: pointer;
  font-weight: bold;
  background-color: var(--color-primary);
  border-bottom: 2px solid var(--color-border);
  transition: background-color 0.2s ease;
  list-style: none;
}

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

summary::before {
  content: '▶ ';
  transition: transform 0.2s ease;
}

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

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

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

details div, details p {
  padding: 0 var(--space) var(--space) var(--space);
}

details p:last-child {
  padding-bottom: var(--space);
}

blockquote {
  background-color: var(--color-surface);
  border-left: 6px solid var(--color-accent);
  margin: var(--space) 0;
  padding: var(--space);
  font-style: italic;
  box-shadow: var(--shadow);
}

ul, ol {
  padding-left: calc(var(--space) * 1.5);
}

li {
  margin-bottom: 0.5rem;
}

footer {
  background-color: var(--color-surface);
  border-top: 4px solid var(--color-border);
  padding: var(--space);
  text-align: center;
  margin-top: calc(var(--space) * 2);
  color: var(--color-muted);
}

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

@media (max-width: 767px) {
  nav {
    flex-direction: column;
    gap: var(--space);
  }
  
  nav ul {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  table {
    font-size: 0.875rem;
  }
  
  th, td {
    padding: 0.5rem;
  }
}