:root {
  --bg-primary: #0a0e14;
  --bg-surface: #111720;
  --bg-surface-raised: #182230;
  --bg-surface-sunken: #070a0e;
  --border-subtle: #1e2c3d;
  --border-strong: #334860;
  --text-primary: #e6ebf2;
  --text-secondary: #94a3b8;
  --text-muted: #5e7188;
  --accent-gold: #c49b45;
  --accent-gold-soft: #f2cca0;
  --accent-cyan: #5fa8b9;
  --accent-red: #c05353;
  --font-serif: "Iowan Old Style", "Palatino Linotype", "URW Palladio L", P052, Georgia, serif;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Source Code Pro", Menlo, Consolas, monospace;
  --max-width: 1080px;
}

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

html {
  font-size: 16px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover, a:focus {
  color: var(--accent-gold-soft);
  text-decoration: underline;
}

/* Header & Navigation */

.site-header {
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-surface-sunken);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
}

.brand-symbol {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 6px;
  border: 1px solid var(--accent-gold);
  background-color: var(--bg-surface);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-gold);
  font-family: var(--font-serif);
  font-weight: bold;
  font-size: 1.15rem;
}

.brand-title {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-primary);
  text-transform: uppercase;
}

.brand-subtitle {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.primary-nav ul {
  display: flex;
  list-style: none;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.nav-link {
  display: inline-block;
  padding: 0.4rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  border: 1px solid transparent;
  border-radius: 4px;
  text-decoration: none;
  text-transform: uppercase;
}

.nav-link:hover, .nav-link:focus {
  color: var(--text-primary);
  border-color: var(--border-subtle);
  background-color: var(--bg-surface);
  text-decoration: none;
}

.nav-link.active {
  color: var(--accent-gold-soft);
  border-color: var(--accent-gold);
  background-color: rgba(196, 155, 69, 0.08);
}

/* Status Bar */

.telemetry-banner {
  border-bottom: 1px solid var(--border-subtle);
  background: linear-gradient(90deg, #070a0e 0%, #111720 50%, #070a0e 100%);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.telemetry-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.45rem 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: space-between;
  align-items: center;
}

.telemetry-item strong {
  color: var(--text-secondary);
  font-weight: 500;
}

.telemetry-indicator {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-gold);
  margin-right: 0.35rem;
  vertical-align: middle;
}

/* Layout */

.page-content {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

.page-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 2rem;
  margin-bottom: 2.5rem;
}

.page-tagline {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent-gold);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.5rem;
}

.page-title {
  font-family: var(--font-serif);
  font-size: 2.35rem;
  font-weight: normal;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.page-lead {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 48rem;
  line-height: 1.6;
}

/* Typography Elements */

h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: normal;
  letter-spacing: 0.01em;
  color: var(--text-primary);
  margin: 2.25rem 0 1rem;
}

h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: normal;
  color: var(--accent-gold-soft);
  margin: 1.25rem 0 0.5rem;
}

p {
  margin-bottom: 1.25rem;
  color: var(--text-secondary);
}

p strong {
  color: var(--text-primary);
}

/* Card Grids */

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
}

.card:hover {
  border-color: var(--border-strong);
  background-color: var(--bg-surface-raised);
}

.card-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-gold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--text-primary);
  margin: 0 0 0.75rem 0;
}

.card-body {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  flex-grow: 1;
}

.card-footer {
  margin-top: 1.25rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Catalog Filter Bar */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
  align-items: center;
}

.filter-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-right: 0.5rem;
}

.filter-btn {
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 3px;
  padding: 0.35rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  cursor: pointer;
}

.filter-btn:hover {
  background: var(--bg-surface-raised);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.filter-btn.active {
  background: var(--bg-surface-sunken);
  color: var(--accent-gold);
  border-color: var(--accent-gold);
}

/* Specimen Tables */

.table-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0 2.5rem;
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  border-radius: 4px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
}

.data-table th,
.data-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.data-table th {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent-gold);
  text-transform: uppercase;
  background-color: var(--bg-surface-sunken);
}

.data-table td {
  color: var(--text-secondary);
}

.data-table td.code-cell {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent-cyan);
}

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

.data-table tr:hover td {
  background-color: rgba(255, 255, 255, 0.02);
  color: var(--text-primary);
}

/* Callout Box */

.callout {
  border-left: 3px solid var(--accent-gold);
  background-color: var(--bg-surface);
  padding: 1.25rem 1.5rem;
  margin: 2rem 0;
  border-radius: 0 4px 4px 0;
}

.callout-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.callout p:last-child {
  margin-bottom: 0;
}

/* Diagrammatic Specimen Box */

.celestial-plate {
  border: 1px solid var(--border-strong);
  background: radial-gradient(circle at center, #142232 0%, #070a0e 75%);
  padding: 2.5rem 2rem;
  border-radius: 6px;
  margin: 2rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.celestial-plate::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 320px;
  height: 320px;
  transform: translate(-50%, -50%);
  border: 1px dashed rgba(196, 155, 69, 0.25);
  border-radius: 50%;
  pointer-events: none;
}

.plate-diagram-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-gold);
  margin-bottom: 0.5rem;
}

.plate-diagram-readout {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--text-primary);
  letter-spacing: 0.1em;
  margin: 1rem 0;
}

.plate-diagram-caption {
  font-family: var(--font-serif);
  font-size: 0.9375rem;
  font-style: italic;
  color: var(--text-muted);
  max-width: 36rem;
  margin: 0 auto;
}

/* Definition List */

.field-specs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin: 1.5rem 0 2rem;
}

.spec-item {
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  padding: 1rem;
  border-radius: 4px;
}

.spec-item dt {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.spec-item dd {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--text-primary);
}

/* Error 404 Layout */

.error-block {
  text-align: center;
  padding: 4rem 1rem;
  max-width: 38rem;
  margin: 0 auto;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 5rem;
  font-weight: 300;
  letter-spacing: 0.1em;
  color: var(--accent-red);
  line-height: 1;
  margin-bottom: 1rem;
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg-surface-sunken);
  color: var(--text-muted);
  font-size: 0.8125rem;
  margin-top: auto;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
}

.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 0.4rem;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }
  .primary-nav ul {
    width: 100%;
  }
  .page-title {
    font-size: 1.85rem;
  }
  .footer-inner {
    grid-template-columns: 1fr;
  }
}