:root {
  --hsq-bg: #0B0F14;
  --hsq-surface: #121A24;
  --hsq-text: #EAF2FF;
  --hsq-muted: #A9B7CC;
  --hsq-border: #2A3A52;
  --hsq-primary: #1F6FEB;
  --hsq-secondary: #FF4D6D;
  --hsq-accent: #2DE2A6;
  --hsq-radius: 14px;
  --hsq-shadow: 0 10px 0 rgba(31, 111, 235, 0.25);
  --hsq-max: 1120px;
}

* {
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--hsq-bg);
  color: var(--hsq-text);
  line-height: 1.6;
  margin: 0;
  padding: 0;
}

.grid-wrapper {
  display: grid;
  grid-template-columns: 1fr;
  max-width: var(--hsq-max);
  margin: 0 auto;
  padding: 0 1rem;
  gap: 2rem;
}

header {
  background: var(--hsq-surface);
  border: 4px solid var(--hsq-border);
  border-radius: var(--hsq-radius);
  box-shadow: var(--hsq-shadow);
  margin: 1rem 0;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.nav-brand {
  font-weight: bold;
  font-size: 1.25rem;
  text-transform: uppercase;
  letter-spacing: -0.025em;
  color: var(--hsq-accent);
}

.nav-links {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 1.5rem;
}

.nav-links a {
  color: var(--hsq-text);
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: calc(var(--hsq-radius) / 2);
  border: 2px solid transparent;
  transition: all 0.2s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  border-color: var(--hsq-primary);
  background: var(--hsq-primary);
  color: var(--hsq-bg);
  outline: none;
}

#breadcrumbs {
  background: var(--hsq-surface);
  border: 2px solid var(--hsq-border);
  border-radius: var(--hsq-radius);
  padding: 0.75rem 1.5rem;
  margin: 1rem 0;
}

.breadcrumb-items {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 0.5rem;
  align-items: center;
}

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

.breadcrumb-items a {
  color: var(--hsq-primary);
  text-decoration: none;
}

.breadcrumb-items a:hover,
.breadcrumb-items a:focus-visible {
  text-decoration: underline;
  outline: 2px solid var(--hsq-primary);
  outline-offset: 2px;
}

main {
  display: grid;
  gap: 2rem;
}

h1 {
  font-size: 2rem;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: -0.025em;
  color: var(--hsq-accent);
  margin: 0 0 1.5rem 0;
  line-height: 1.2;
}

h2 {
  font-size: 1.5rem;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: -0.025em;
  color: var(--hsq-secondary);
  margin: 0 0 1rem 0;
  line-height: 1.3;
}

h3 {
  font-size: 1.25rem;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: -0.025em;
  color: var(--hsq-primary);
  margin: 0 0 0.75rem 0;
  line-height: 1.3;
}

article,
section,
aside {
  background: var(--hsq-surface);
  border: 4px solid var(--hsq-border);
  border-radius: var(--hsq-radius);
  box-shadow: var(--hsq-shadow);
  padding: 2rem;
}

p {
  margin: 0 0 1rem 0;
}

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

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

ul,
ol {
  margin: 0 0 1rem 0;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.5rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--hsq-bg);
  border: 2px solid var(--hsq-border);
  border-radius: var(--hsq-radius);
  overflow: hidden;
  margin: 1rem 0;
}

caption {
  background: var(--hsq-surface);
  padding: 1rem;
  font-weight: bold;
  text-align: left;
  border-bottom: 2px solid var(--hsq-border);
}

th,
td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--hsq-border);
}

th {
  background: var(--hsq-surface);
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: -0.025em;
  color: var(--hsq-accent);
}

tbody tr:nth-child(even) {
  background: rgba(42, 58, 82, 0.3);
}

tbody tr:hover {
  background: rgba(31, 111, 235, 0.1);
}

details {
  background: var(--hsq-surface);
  border: 4px solid var(--hsq-border);
  border-radius: var(--hsq-radius);
  box-shadow: var(--hsq-shadow);
  margin: 1rem 0;
}

summary {
  padding: 1.5rem;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: -0.025em;
  color: var(--hsq-secondary);
  cursor: pointer;
  transition: background-color 0.2s ease;
  list-style: none;
}

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

summary::before {
  content: '+';
  display: inline-block;
  width: 1.5rem;
  height: 1.5rem;
  background: var(--hsq-primary);
  color: var(--hsq-bg);
  text-align: center;
  line-height: 1.5rem;
  border-radius: 50%;
  margin-right: 1rem;
  font-weight: bold;
  transition: transform 0.2s ease;
}

details[open] summary::before {
  content: '−';
  transform: rotate(180deg);
}

summary:hover,
summary:focus-visible {
  background: rgba(31, 111, 235, 0.1);
  outline: 2px solid var(--hsq-primary);
  outline-offset: -2px;
}

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

details > *:not(summary) {
  padding: 0 1.5rem 1.5rem 1.5rem;
}

blockquote {
  background: var(--hsq-bg);
  border-left: 4px solid var(--hsq-accent);
  margin: 1rem 0;
  padding: 1rem 1.5rem;
  font-style: italic;
  color: var(--hsq-muted);
}

footer {
  background: var(--hsq-surface);
  border: 4px solid var(--hsq-border);
  border-radius: var(--hsq-radius);
  box-shadow: var(--hsq-shadow);
  padding: 1.5rem;
  margin: 2rem 0 1rem 0;
  text-align: center;
  color: var(--hsq-muted);
}

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

@media (min-width: 768px) {
  .grid-wrapper {
    padding: 0 2rem;
  }
  
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  nav {
    flex-wrap: nowrap;
  }
  
  .nav-brand {
    font-size: 1.5rem;
  }
  
  article,
  section,
  aside {
    padding: 2.5rem;
  }
}

@media (min-width: 1024px) {
  h1 {
    font-size: 3rem;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  main {
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
  }
  
  main > article {
    grid-column: 1 / -1;
  }
  
  table {
    overflow-x: auto;
  }
  
  th {
    position: sticky;
    top: 0;
    z-index: 1;
  }
  
  article,
  section,
  aside {
    padding: 3rem;
  }
}

@media (max-width: 767px) {
  table {
    overflow-x: auto;
    display: block;
    white-space: nowrap;
  }
  
  th,
  td {
    padding: 0.75rem;
    font-size: 0.9rem;
  }
}