/**
 * Sovereign Classification Engine — Global Stylesheet
 * Professional, sober design system for an authoritative reference platform.
 */

/* === CSS Custom Properties === */
:root {
  /* Colours */
  --colour-primary: #1a2744;
  --colour-primary-light: #2d3f5e;
  --colour-primary-dark: #0f172a;
  --colour-accent: #c9a94e;
  --colour-accent-muted: #b8942f;

  --colour-text: #1f2937;
  --colour-text-muted: #5a6577;
  --colour-text-light: #8492a6;

  --colour-background: #f4f5f7;
  --colour-surface: #ffffff;
  --colour-surface-alt: #f7f8fa;

  --colour-border: #e2e6ec;
  --colour-border-light: #eef1f5;

  --colour-success: #16a34a;
  --colour-warning: #d97706;
  --colour-error: #dc2626;
  --colour-info: #2563eb;

  /* Typography */
  --font-heading: 'Georgia', 'Times New Roman', serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Borders & Shadows */
  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.08);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;

  /* Layout */
  --max-width: 1200px;
  --content-width: 800px;
}

/* === Reset & Base === */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--colour-text);
  background-color: var(--colour-background);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  color: var(--colour-primary-dark);
}

h1 { font-size: 2rem; margin-bottom: var(--spacing-md); }
h2 { font-size: 1.5rem; margin-bottom: var(--spacing-sm); }
h3 { font-size: 1.25rem; margin-bottom: var(--spacing-sm); }
h4 { font-size: 1.1rem; margin-bottom: var(--spacing-xs); }

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--colour-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--colour-primary-light);
  text-decoration: underline;
}

strong {
  font-weight: 600;
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--colour-surface-alt);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--colour-border-light);
}

/* === Site Header === */
.site-header {
  background: var(--colour-primary-dark);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #ffffff;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.05em;
  text-decoration: none;
}

.nav-logo:hover {
  color: var(--colour-accent);
  text-decoration: none;
}

.nav-logo svg {
  color: var(--colour-accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: #ffffff;
  cursor: pointer;
  padding: 0.25rem;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition-fast);
  padding: 0.25rem 0;
}

.nav-links a:hover {
  color: #ffffff;
  text-decoration: none;
}

/* === Main Content === */
.main-content {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-2xl) var(--spacing-lg);
  width: 100%;
}

/* === Site Footer === */
.site-footer {
  background: var(--colour-primary-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--spacing-xl) var(--spacing-lg);
  margin-top: auto;
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer-container p {
  margin: 0;
  font-size: 0.8rem;
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.8rem;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: #ffffff;
}

/* === Breadcrumb === */
.breadcrumb {
  margin-bottom: var(--spacing-lg);
}

.breadcrumb ol {
  display: flex;
  list-style: none;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--colour-text-light);
}

.breadcrumb li::after {
  content: '/';
  margin-left: 0.5rem;
  color: var(--colour-border);
}

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

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

.breadcrumb a:hover {
  color: var(--colour-primary);
  text-decoration: underline;
}

/* === Cards === */
.card {
  background: var(--colour-surface);
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

/* === Badges === */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  font-size: 0.7rem;
  font-weight: 600;
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-common {
  background: #e8f5e9;
  color: #2e7d32;
}

.badge-scarce {
  background: #fff3e0;
  color: #e65100;
}

.badge-rare {
  background: #fce4ec;
  color: #c62828;
}

.badge-very-rare {
  background: #f3e5f5;
  color: #6a1b9a;
}

.badge-extreme-rarity {
  background: #1a2744;
  color: #c9a94e;
}

.badge-unclassified {
  background: var(--colour-surface-alt);
  color: var(--colour-text-light);
  border: 1px solid var(--colour-border);
}

/* Recognition badges */
.badge-standard-issue {
  background: var(--colour-surface-alt);
  color: var(--colour-text-muted);
  border: 1px solid var(--colour-border-light);
}

.badge-catalogued-variation {
  background: #e3f2fd;
  color: #1565c0;
}

.badge-recognised-type {
  background: #e8eaf6;
  color: #283593;
}

.badge-key-date {
  background: #1a2744;
  color: #c9a94e;
}

/* === Tables === */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

th, td {
  padding: 0.625rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--colour-border-light);
}

th {
  font-weight: 600;
  color: var(--colour-text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: var(--colour-surface-alt);
}

tr:hover td {
  background: var(--colour-surface-alt);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  font-family: var(--font-body);
}

.btn-primary {
  background: var(--colour-primary);
  color: #ffffff;
  border-color: var(--colour-primary);
}

.btn-primary:hover {
  background: var(--colour-primary-light);
  border-color: var(--colour-primary-light);
  color: #ffffff;
  text-decoration: none;
}

.btn-secondary {
  background: var(--colour-surface);
  color: var(--colour-text);
  border-color: var(--colour-border);
}

.btn-secondary:hover {
  background: var(--colour-surface-alt);
  border-color: var(--colour-text-light);
  text-decoration: none;
}

/* === Utility Classes === */
.text-muted { color: var(--colour-text-muted); }
.text-light { color: var(--colour-text-light); }
.text-small { font-size: 0.8rem; }
.text-center { text-align: center; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* === Responsive === */
@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--colour-primary-dark);
    flex-direction: column;
    padding: var(--spacing-md) var(--spacing-lg);
    gap: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: var(--spacing-sm) 0;
    display: block;
  }

  .footer-container {
    flex-direction: column;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.3rem; }

  .main-content {
    padding: var(--spacing-xl) var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .main-content {
    padding: var(--spacing-lg) var(--spacing-sm);
  }

  h1 { font-size: 1.4rem; }
}

/* === Print === */
@media print {
  .site-header,
  .site-footer,
  .nav-toggle {
    display: none;
  }

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

  body {
    background: #fff;
    color: #000;
  }
}