:root {
  /* Premium dark palette - more refined */
  --bg: #0a0c10;
  --bg-soft: #0f1218;
  --bg-card: rgba(15, 18, 24, 0.75);
  --bg-elevated: rgba(22, 26, 34, 0.85);
  --bg-header: rgba(8, 10, 14, 0.95);
  
  /* Border colors - subtler */
  --line: rgba(255, 255, 255, 0.06);
  --line-strong: rgba(255, 255, 255, 0.12);
  --line-subtle: rgba(255, 255, 255, 0.03);
  --line-accent: rgba(123, 159, 255, 0.3);
  
  /* Text colors - improved contrast */
  --text: #e2e6ed;
  --text-heading: #ffffff;
  --muted: #8b93a7;
  --muted-subtle: #5a6275;
  
  /* Accent colors - refined */
  --accent: #6b8cff;
  --accent-soft: rgba(107, 140, 255, 0.1);
  --accent-2: #4dd9c0;
  --accent-2-soft: rgba(77, 217, 192, 0.08);
  
  /* Status colors */
  --warning: #f0b863;
  --warning-soft: rgba(240, 184, 99, 0.08);
  --success: #5cd699;
  --success-soft: rgba(92, 214, 153, 0.08);
  --danger: #ff6b7a;
  --danger-soft: rgba(255, 107, 122, 0.08);
  
  /* Shadows - more premium */
  --shadow: 0 2px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 60px rgba(107, 140, 255, 0.08);
  --shadow-card-hover: 0 12px 40px rgba(0, 0, 0, 0.55);
  
  /* Radii - slightly tighter */
  --radius: 12px;
  --radius-lg: 16px;
  --radius-sm: 8px;
  --radius-xs: 6px;
  --radius-pill: 9999px;
  
  /* Layout - refined spacing */
  --container: 1200px;
  --header-height: 64px;
  --sidebar-width: 260px;
  
  /* Transitions */
  --transition: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; }

html { 
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1.5rem);
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(107, 140, 255, 0.08), transparent 50%),
    radial-gradient(ellipse 60% 40% at 90% -5%, rgba(77, 217, 192, 0.05), transparent 40%),
    radial-gradient(ellipse 40% 30% at 50% 100%, rgba(107, 140, 255, 0.04), transparent 40%),
    linear-gradient(180deg, #080a0e 0%, #0a0c10 40%, #0c0f14 100%);
  background-attachment: fixed;
  line-height: 1.65;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { 
  color: var(--accent-2); 
  text-decoration: none; 
  transition: color var(--transition), opacity var(--transition);
}
a:hover { 
  color: var(--accent); 
}

code, pre { 
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; 
}
code { 
  font-size: 0.85em; 
  background: rgba(0, 0, 0, 0.4);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--accent-2);
  border: 1px solid rgba(77, 217, 192, 0.12);
}
pre {
  margin: 1.25rem 0;
  overflow: auto;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: rgba(6, 8, 12, 0.95);
  box-shadow: inset 0 1px 8px rgba(0, 0, 0, 0.5);
  font-size: 0.875rem;
  line-height: 1.55;
}
pre code { 
  white-space: pre; 
  background: transparent;
  padding: 0;
  color: var(--text);
  border: none;
  font-size: inherit;
}

.container { 
  width: min(calc(100% - 2.5rem), var(--container)); 
  margin: 0 auto; 
}

.skip-link {
  position: absolute; 
  left: -999px; 
  top: 0;
  background: var(--accent); 
  color: #080a0e; 
  padding: 0.6rem 1rem; 
  z-index: 9999;
  font-weight: 600;
  border-radius: 0 0 var(--radius-xs) 0;
  font-size: 0.875rem;
}
.skip-link:focus { 
  left: 1.25rem; 
  top: 0; 
}

/* Header & Navigation - cleaner */
.site-header {
  position: sticky; 
  top: 0; 
  z-index: 100;
  backdrop-filter: blur(20px) saturate(160%);
  background: var(--bg-header);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex; 
  align-items: center; 
  justify-content: space-between;
  gap: 1.25rem; 
  min-height: var(--header-height);
}

.brand {
  display: inline-flex; 
  align-items: center; 
  gap: 0.75rem;
  color: var(--text); 
  text-decoration: none;
  transition: opacity var(--transition);
  flex-shrink: 0;
}
.brand:hover { 
  opacity: 0.85;
}

.brand-logo-img {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-xs);
  object-fit: cover;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid var(--line-strong);
}
.brand:hover .brand-logo-img {
  transform: scale(1.03);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.6);
}

.brand-text { 
  display: flex; 
  flex-direction: column; 
  gap: 0; 
}
.brand strong { 
  display: block; 
  font-size: 1.05rem; 
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-heading);
}
.brand small { 
  color: var(--muted-subtle); 
  display: block; 
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.site-nav {
  display: flex; 
  gap: 0.125rem; 
  flex-wrap: wrap; 
  justify-content: flex-end;
  align-items: center;
}
.site-nav a {
  padding: 0.45rem 0.75rem; 
  border-radius: var(--radius-pill); 
  color: var(--muted);
  border: 1px solid transparent;
  font-size: 0.8rem;
  font-weight: 500;
  transition: all var(--transition);
  white-space: nowrap;
}
.site-nav a:hover {
  color: var(--text); 
  text-decoration: none;
  border-color: var(--line);
  background: rgba(255,255,255,0.04);
}
.site-nav a.active {
  background: var(--accent-soft);
  border-color: rgba(107, 140, 255, 0.25);
  color: var(--accent);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line-strong);
  background: rgba(255,255,255,0.03);
  color: var(--text); 
  border-radius: var(--radius-xs); 
  padding: 0.5rem 0.875rem;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition);
}
.nav-toggle:hover {
  background: rgba(255,255,255,0.06);
}

/* Page Layout - improved spacing */
.page-shell {
  display: grid; 
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  gap: 2.5rem; 
  padding: 2rem 0 4rem;
}

.page-sidebar {
  position: sticky; 
  top: calc(var(--header-height) + 1.5rem); 
  height: max-content;
  max-height: calc(100vh - var(--header-height) - 3rem);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}
.page-sidebar::-webkit-scrollbar { width: 3px; }
.page-sidebar::-webkit-scrollbar-thumb { 
  background: var(--line); 
  border-radius: 2px; 
}

.sidebar-card { 
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius); 
  box-shadow: var(--shadow);
  padding: 1rem;
  margin-bottom: 0.875rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.sidebar-card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow), var(--shadow-glow);
}

.sidebar-card.compact { 
  padding: 0.875rem 1rem; 
}
.sidebar-card.compact p { 
  margin: 0.375rem 0 0; 
  font-size: 0.8rem; 
  line-height: 1.55;
}

.side-links { 
  list-style: none; 
  padding: 0; 
  margin: 0;
  max-height: calc(100vh - 280px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}
.side-links::-webkit-scrollbar { width: 2px; }
.side-links::-webkit-scrollbar-thumb { 
  background: var(--line); 
  border-radius: 2px; 
}

.side-links li + li { margin-top: 0.0625rem; }
.side-links a {
  display: block; 
  padding: 0.4rem 0.625rem; 
  border-radius: var(--radius-xs); 
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 500;
  transition: all var(--transition);
  border-left: 2px solid transparent;
  margin-left: -2px;
  line-height: 1.45;
}
.side-links a:hover { 
  text-decoration: none; 
  color: var(--text); 
  background: rgba(255,255,255,0.03);
  border-left-color: var(--accent-2);
}
.side-links a.active {
  color: var(--accent);
  background: var(--accent-soft);
  border-left-color: var(--accent);
}

.page-content > * + * { margin-top: 2rem; }
.page-content > section + section { margin-top: 2.75rem; }

/* Hero & Page Header - premium styling */
.hero, .page-header {
  padding: 2rem 2.25rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at top right, rgba(107, 140, 255, 0.08), transparent 40%),
    radial-gradient(circle at bottom left, rgba(77, 217, 192, 0.04), transparent 30%),
    linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  position: relative;
  overflow: hidden;
}
.hero::before, .page-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.12), transparent);
}

.hero h1, .page-header h1 { 
  font-size: clamp(1.75rem, 3.5vw, 2.75rem); 
  line-height: 1.1; 
  margin: 0.375rem 0 0.875rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-heading);
}
.page-header h1 { 
  font-size: clamp(1.5rem, 2.5vw, 2.25rem); 
}

.eyebrow {
  margin: 0; 
  text-transform: uppercase; 
  letter-spacing: 0.1em; 
  font-size: 0.65rem;
  color: var(--accent-2); 
  font-weight: 700;
}

.lead { 
  color: var(--muted); 
  font-size: 1.05rem; 
  max-width: 60ch;
  line-height: 1.65;
  margin: 0;
}

.hero-actions { 
  display: flex; 
  gap: 0.75rem; 
  flex-wrap: wrap; 
  margin-top: 1.5rem; 
}

.button {
  display: inline-flex; 
  align-items: center; 
  justify-content: center;
  padding: 0.65rem 1.25rem; 
  border-radius: var(--radius-sm); 
  border: 1px solid var(--line-strong);
  color: var(--text); 
  text-decoration: none; 
  background: rgba(255,255,255,0.04);
  font-weight: 600;
  font-size: 0.875rem;
  transition: all var(--transition);
  cursor: pointer;
  gap: 0.375rem;
}
.button:hover { 
  text-decoration: none; 
  transform: translateY(-1px);
  background: rgba(255,255,255,0.08);
  border-color: var(--line);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}
.button.primary {
  background: linear-gradient(135deg, var(--accent), #5a7fff);
  color: #080a0e; 
  border-color: transparent; 
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(107, 140, 255, 0.35);
}
.button.primary:hover {
  box-shadow: 0 6px 20px rgba(107, 140, 255, 0.5);
  transform: translateY(-1px);
}

/* Hero Grid Stats - cleaner */
.hero-grid { 
  display: grid; 
  gap: 0.875rem;
  grid-template-columns: repeat(3, minmax(0, 1fr)); 
  margin-top: 2rem; 
}

/* Cards - refined */
.card-grid { 
  display: grid; 
  gap: 1rem;
}
.card-grid.two-up { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card-grid.three-up,
.card-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.doc-grid { 
  display: grid; 
  gap: 1rem;
  grid-template-columns: repeat(3, minmax(0, 1fr)); 
}

.stat-card, .card, .doc-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: all var(--transition);
}
.stat-card:hover, .card:hover, .doc-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover), var(--shadow-glow);
}

.stat-card, .card, .doc-card { padding: 1.25rem; }

.stat-card {
  background: var(--bg-elevated);
  border-color: var(--line-subtle);
}
.stat-card strong { 
  display: block; 
  margin-bottom: 0.375rem; 
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-heading);
}
.stat-card span {
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.55;
}

.card h3, .doc-card h3 { 
  margin-top: 0; 
  margin-bottom: 0.625rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-heading);
  line-height: 1.35;
}
.card p, .doc-card p { 
  color: var(--muted); 
  margin-bottom: 0;
  font-size: 0.875rem;
  line-height: 1.6;
}

.doc-card { 
  color: var(--text); 
  display: flex;
  flex-direction: column;
}
.doc-card:hover { 
  text-decoration: none; 
  border-color: var(--accent);
}

.feature-grid .card { min-height: 100%; }

/* Callouts - refined */
.callout {
  border-radius: var(--radius-sm); 
  padding: 1rem 1.25rem; 
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.015);
  position: relative;
}
.callout::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}
.callout.info { 
  border-color: rgba(107, 140, 255, 0.15);
  background: var(--accent-soft);
}
.callout.info::before { background: var(--accent); }
.callout.warning { 
  border-color: rgba(240, 184, 99, 0.15);
  background: var(--warning-soft);
}
.callout.warning::before { background: var(--warning); }
.callout.success { 
  border-color: rgba(92, 214, 153, 0.15);
  background: var(--success-soft);
}
.callout.success::before { background: var(--success); }
.callout strong {
  color: var(--text-heading);
  font-weight: 700;
}
.callout p { margin: 0.375rem 0 0; }
.callout p:first-child { margin-top: 0; }

/* Diagrams */
.diagram { 
  font-size: 0.85rem;
  line-height: 1.55;
}

/* Lists - refined */
.check-list, .numbered-list { 
  padding-left: 1.375rem;
  color: var(--muted);
}
.check-list li::marker,
.numbered-list li::marker {
  color: var(--accent);
  font-weight: 600;
}
.check-list li + li, 
.numbered-list li + li { margin-top: 0.5rem; }

/* Section Headings - tighter */
section h2 { 
  font-size: 1.35rem; 
  margin: 0 0 0.875rem;
  font-weight: 700;
  color: var(--text-heading);
  letter-spacing: -0.01em;
}
section h3 {
  font-size: 1.05rem;
  margin: 1.5rem 0 0.625rem;
  font-weight: 700;
  color: var(--text-heading);
}
section p, li, td, th { color: var(--muted); }
section p { margin: 0.625rem 0; }

/* Tables - cleaner */
table {
  width: 100%; 
  border-collapse: separate;
  border-spacing: 0;
  overflow: hidden;
  border-radius: var(--radius-sm); 
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.015);
  margin: 1.25rem 0;
}
thead th {
  text-align: left; 
  color: var(--text-heading); 
  font-weight: 700;
  background: rgba(255,255,255,0.03);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
th, td { 
  padding: 0.875rem 1rem; 
  border-bottom: 1px solid var(--line); 
  vertical-align: top; 
  font-size: 0.875rem;
}
tbody tr:last-child td { border-bottom: none; }
tbody tr { transition: background var(--transition); }
tbody tr:hover { background: rgba(255,255,255,0.015); }

/* Footer - cleaner */
.site-footer {
  border-top: 1px solid var(--line); 
  padding: 2.5rem 0 3rem; 
  background: rgba(0,0,0,0.2);
  margin-top: 1.5rem;
}
.footer-grid { 
  display: grid;
  grid-template-columns: 2fr 1fr 1fr; 
  gap: 2.5rem;
}
.footer-grid h3 { 
  margin-top: 0; 
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}
.footer-grid p {
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.6;
  margin: 0;
}
.footer-grid ul { 
  padding-left: 1rem; 
  margin: 0;
  color: var(--muted);
}
.footer-grid li { margin: 0.375rem 0; }
.footer-grid a { color: var(--muted); }
.footer-grid a:hover { color: var(--accent-2); }

/* Responsive - refined breakpoints */
@media (max-width: 1024px) {
  .page-shell { 
    grid-template-columns: 1fr; 
    gap: 1.25rem;
  }
  .page-sidebar { 
    position: static; 
    order: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.875rem;
    max-height: none;
  }
  .sidebar-card { margin-bottom: 0; }
  .side-links { max-height: 260px; }
  .hero-grid, 
  .card-grid, 
  .doc-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  :root { --header-height: 60px; }
  
  .nav-toggle { display: inline-flex; }
  
  .site-nav {
    display: none; 
    position: absolute; 
    left: 1rem; 
    right: 1rem; 
    top: calc(100% + 0.5rem);
    flex-direction: column; 
    padding: 0.625rem; 
    border-radius: var(--radius-sm);
    background: rgba(8, 10, 14, 0.98); 
    border: 1px solid var(--line-strong);
    backdrop-filter: blur(20px);
    max-height: 70vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
  }
  .site-nav.open { display: flex; }
  .site-nav a {
    padding: 0.625rem 0.875rem;
    border-radius: var(--radius-xs);
  }
  
  .page-shell { padding: 1.25rem 0 2.5rem; }
  .page-sidebar { 
    grid-template-columns: 1fr;
    order: 2;
  }
  
  .hero, .page-header { padding: 1.5rem; }
  .hero h1, .page-header h1 { font-size: 1.5rem; }
  
  .hero-grid, 
  .card-grid, 
  .card-grid.two-up,
  .card-grid.three-up,
  .doc-grid { grid-template-columns: 1fr; }
  
  .footer-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  
  .container { width: min(calc(100% - 1.5rem), var(--container)); }
}

@media (max-width: 420px) {
  .brand small { display: none; }
  .hero-actions { flex-direction: column; }
  .button { width: 100%; }
}