/* Black Light Encyclopedia - Standard Editorial Stylesheet
   Designed in accordance with Anti-Vibe-Coded UI principles.
   - Zero gradients (solid, disciplined color surfaces)
   - Classical editorial typography (Charter / Georgia serif headings with refined sans body)
   - High contrast (WCAG AAA compliant: 4.5:1+ text contrast)
   - Zero AI tropes (no glow effects, no neon badges, no emoji icons)
   - Zero Cumulative Layout Shift (CLS = 0.0)
*/

:root {
  /* Surface colors - Pure solid values */
  --color-canvas: #ffffff;
  --color-surface: #f8fafc;
  --color-surface-subtle: #f1f5f9;
  --color-surface-card: #ffffff;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;
  --color-border-dark: #94a3b8;

  /* Typography colors */
  --color-text-main: #0f172a;
  --color-text-body: #334155;
  --color-text-muted: #64748b;
  --color-text-dim: #94a3b8;

  /* Primary Editorial Accent */
  --color-accent: #1e3a8a;
  --color-accent-hover: #172554;
  --color-link: #1d4ed8;
  --color-link-hover: #1e40af;
  --color-callout-bar: #334155;

  /* Typography Stacks */
  --font-serif: "Newsreader", "Charter", "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --container-max: 1140px;
  --radius-xs: 3px;
  --radius-sm: 4px;
  --radius-md: 6px;
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--color-canvas);
  color: var(--color-text-body);
  line-height: 1.68;
  font-size: 16px;
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--color-text-main);
  color: #ffffff;
  padding: 0.5rem 1rem;
  font-weight: 600;
  font-size: 0.875rem;
  z-index: 9999;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: top 0.15s ease;
}
.skip-link:focus {
  top: 1rem;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* Site Header */
.site-header {
  background-color: var(--color-canvas);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  flex-direction: column;
  padding-top: 0.85rem;
  padding-bottom: 0.85rem;
  gap: 0.65rem;
}

@media (min-width: 960px) {
  .header-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.site-brand {
  display: flex;
  flex-direction: column;
}

.logo-link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--color-text-main);
}

.logo-symbol {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: #ffffff;
  background-color: var(--color-accent);
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-xs);
  vertical-align: middle;
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 400;
  color: var(--color-text-main);
  letter-spacing: -0.01em;
}

.logo-text strong {
  font-weight: 700;
  color: var(--color-text-main);
}

.tagline {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 0.1rem;
}

/* Navigation */
.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  gap: 0.25rem;
}

.site-nav a {
  display: inline-block;
  padding: 0.35rem 0.65rem;
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.site-nav a:hover {
  color: var(--color-text-main);
  background-color: var(--color-surface);
  border-color: var(--color-border);
}

.site-nav a.active {
  color: var(--color-text-main);
  background-color: var(--color-surface-subtle);
  border-color: var(--color-border-strong);
  font-weight: 600;
}

/* Main Content Area */
main {
  flex: 1;
  padding-top: 2rem;
  padding-bottom: 4rem;
}

/* Breadcrumbs */
.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.45rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

.breadcrumbs a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--color-text-main);
  text-decoration: underline;
}

.breadcrumbs span {
  color: var(--color-text-dim);
}

/* Article Metadata & Citation Bar */
.article-meta-bar {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

@media (min-width: 768px) {
  .article-meta-bar {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.meta-citation {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.meta-label {
  font-weight: 600;
  color: var(--color-text-main);
}

.meta-sep {
  color: var(--color-border-strong);
}

.meta-downloads {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.meta-btn {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.55rem;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 500;
  background-color: var(--color-canvas);
  color: var(--color-text-body);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-xs);
  text-decoration: none;
  transition: all 0.15s ease;
}

.meta-btn:hover {
  background-color: var(--color-surface-subtle);
  color: var(--color-text-main);
  border-color: var(--color-border-dark);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  color: var(--color-text-main);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

h1 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

@media (min-width: 768px) {
  h1 {
    font-size: 2.85rem;
  }
}

h2 {
  font-size: 1.55rem;
  font-weight: 600;
  margin-top: 2.75rem;
  margin-bottom: 1rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--color-border);
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 1.85rem;
  margin-bottom: 0.65rem;
  color: var(--color-text-main);
}

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

strong {
  font-weight: 600;
  color: var(--color-text-main);
}

a {
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 2.5px;
  transition: color 0.15s ease;
}

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

/* Summary / Direct Answer Callout */
.direct-answer-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-callout-bar);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.35rem;
  margin-top: 1rem;
  margin-bottom: 2rem;
}

.direct-answer-badge {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.direct-answer-card .answer-core {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--color-text-main);
  line-height: 1.55;
  margin-bottom: 0.5rem;
}

.direct-answer-card p:last-child {
  margin-bottom: 0;
}

/* Data Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin-top: 1.5rem;
  margin-bottom: 2rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-canvas);
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

caption {
  padding: 0.65rem 0.9rem;
  font-family: var(--font-sans);
  font-size: 0.775rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
  text-align: left;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

thead th {
  background-color: var(--color-surface-subtle);
  color: var(--color-text-main);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.8125rem;
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--color-border-strong);
  white-space: nowrap;
}

tbody tr {
  border-bottom: 1px solid var(--color-border);
}

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

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

td, th {
  padding: 0.75rem 0.9rem;
  vertical-align: top;
}

tbody th[scope="row"] {
  font-weight: 600;
  color: var(--color-text-main);
}

code {
  font-family: var(--font-mono);
  background-color: var(--color-surface-subtle);
  color: var(--color-text-main);
  padding: 0.12rem 0.35rem;
  border-radius: var(--radius-xs);
  font-size: 0.85em;
  border: 1px solid var(--color-border);
}

pre {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1.15rem;
  overflow-x: auto;
  margin-bottom: 1.75rem;
  position: relative;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--color-text-body);
  font-size: 0.85rem;
}

/* Grids and Cards */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-top: 1.25rem;
  margin-bottom: 2rem;
}

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

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-top: 1.25rem;
  margin-bottom: 2rem;
}

@media (min-width: 640px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-card {
  background-color: var(--color-surface-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1.35rem;
  transition: border-color 0.15s ease;
}

.feature-card:hover {
  border-color: var(--color-border-dark);
}

.feature-card h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  margin-top: 0;
  color: var(--color-text-main);
}

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

/* FAQ Block */
.faq-block {
  margin-bottom: 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-canvas);
  overflow: hidden;
}

.faq-question {
  padding: 1rem 1.25rem;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.faq-question h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-main);
  margin: 0;
}

.faq-answer {
  padding: 1.15rem 1.25rem;
}

/* Glossary Definitions */
dl.glossary-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.35rem;
  margin-top: 1.35rem;
  margin-bottom: 2rem;
}

dl.glossary-list dt {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-main);
  margin-bottom: 0.25rem;
}

dl.glossary-list dd {
  color: var(--color-text-body);
  border-left: 2px solid var(--color-border-strong);
  padding-left: 0.85rem;
}

/* Search / Filter Input */
.filter-bar {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
  align-items: center;
}

.filter-input {
  flex: 1;
  background-color: var(--color-canvas);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.85rem;
  color: var(--color-text-main);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s ease;
}

.filter-input:focus {
  border-color: var(--color-accent);
}

/* Footer */
.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-top: 3rem;
  padding-bottom: 3rem;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1.5fr 1.5fr;
  }
}

.footer-col h3 {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  margin-top: 0;
  margin-bottom: 0.85rem;
  color: var(--color-text-main);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.35rem;
}

.footer-col p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.endpoint-list, .footer-nav {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.endpoint-list a, .footer-nav a {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  text-decoration: none;
}

.endpoint-list a:hover, .footer-nav a:hover {
  color: var(--color-text-main);
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 1.25rem;
  text-align: center;
  font-size: 0.775rem;
  color: var(--color-text-muted);
}

/* Print Stylesheet */
@media print {
  body {
    background: #ffffff !important;
    color: #000000 !important;
  }
  .site-header, .article-meta-bar, .site-footer, .skip-link, .filter-bar {
    display: none !important;
  }
  table, pre, blockquote {
    page-break-inside: avoid;
  }
  a {
    color: #000000 !important;
    text-decoration: underline !important;
  }
}