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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

a {
  color: var(--accent-bright);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--neon-purple-bright);
}

img {
  max-width: 100%;
  display: block;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.15;
  font-weight: 600;
  letter-spacing: -0.015em;
}

code, pre {
  font-family: var(--font-mono);
}

table {
  border-collapse: collapse;
  width: 100%;
}

/* ============================================
   Global focus ring — keyboard a11y
   ============================================ */

:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-xs);
}

/* Form inputs already manage their own focus shadow */
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.25);
}

/* ============================================
   Selection + scrollbar polish
   ============================================ */

::selection {
  background: rgba(var(--accent-rgb), 0.3);
  color: var(--text-primary);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-deep);
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 100px;
  border: 2px solid var(--bg-deep);
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(var(--accent-rgb), 0.35);
}

html {
  scrollbar-color: rgba(255, 255, 255, 0.08) var(--bg-deep);
  scrollbar-width: thin;
}

/* ============================================
   Layered atmospheric background
   ============================================ */

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(900px 600px at 12% -5%, rgba(6, 182, 212, 0.10), transparent 60%),
    radial-gradient(800px 600px at 95% 8%, rgba(139, 92, 246, 0.10), transparent 60%),
    radial-gradient(1000px 700px at 50% 110%, rgba(139, 92, 246, 0.07), transparent 60%),
    radial-gradient(600px 500px at 85% 85%, rgba(6, 182, 212, 0.05), transparent 60%);
  pointer-events: none;
  z-index: 0;
  animation: bg-drift 28s var(--ease-in-out-circ) infinite alternate;
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    radial-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 80px 80px, 80px 80px, 32px 32px;
  background-position: -1px -1px, -1px -1px, 0 0;
  pointer-events: none;
  z-index: 0;
  mask-image: radial-gradient(ellipse 100% 80% at 50% 0%, #000 30%, transparent 90%);
  -webkit-mask-image: radial-gradient(ellipse 100% 80% at 50% 0%, #000 30%, transparent 90%);
}

/* Pause heavy repaints when tab is hidden — toggled by JS */
body.bg-paused::before {
  animation-play-state: paused;
}

@keyframes bg-drift {
  0%   { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(-2%, 1%, 0) scale(1.04); }
}

/* ============================================
   Disclaimer bar
   ============================================ */

.disclaimer-bar {
  background:
    linear-gradient(90deg, rgba(245, 158, 11, 0.08), rgba(245, 158, 11, 0.16), rgba(245, 158, 11, 0.08));
  border-bottom: 1px solid rgba(245, 158, 11, 0.35);
  color: var(--neon-gold-bright);
  text-align: center;
  padding: 9px 16px;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  position: relative;
  z-index: 100;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.disclaimer-bar::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(245, 158, 11, 0.08), transparent);
  background-size: 200% 100%;
  animation: shimmer 8s linear infinite;
  pointer-events: none;
}

@keyframes shimmer {
  0% { background-position: -100% 0; }
  100% { background-position: 200% 0; }
}

.disclaimer-bar a {
  color: var(--neon-gold-bright);
  text-decoration: underline;
}

/* ============================================
   Containers
   ============================================ */

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

.container--narrow { max-width: var(--container-narrow); }
.container--wide   { max-width: var(--container-wide); }

/* ============================================
   Header
   ============================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(7, 7, 12, 0.6);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  border-bottom: 1px solid transparent;
  transition: background var(--transition-base), border-color var(--transition-base);
}

.site-header.scrolled {
  background: rgba(7, 7, 12, 0.85);
  border-bottom-color: var(--border-subtle);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  transition: opacity var(--transition-fast);
}

.logo:hover {
  opacity: 0.85;
  color: var(--text-primary);
}

.logo-img {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  filter: drop-shadow(0 0 8px rgba(6, 182, 212, 0.3));
}

.nav-links {
  display: flex;
  gap: 2px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  position: relative;
}

.nav-links a:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}

.nav-links a.active {
  color: var(--text-primary);
  background: rgba(6, 182, 212, 0.08);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 1px;
  background: var(--gradient-hero);
  border-radius: 1px;
}

.mobile-menu-btn {
  display: none;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 1.1rem;
  cursor: pointer;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.mobile-menu-btn:hover {
  border-color: var(--border-medium);
  background: rgba(255, 255, 255, 0.06);
}

/* ============================================
   Sections — editorial rhythm
   ============================================ */

.section {
  padding: var(--section-pad-y) 0;
  position: relative;
  z-index: 1;
}

.section--tight {
  padding: var(--section-pad-y-tight) 0;
}

.section--flush-top {
  padding-top: 0;
}

.section--flush-bottom {
  padding-bottom: 0;
}

.section-title {
  font-size: 2.1rem;
  margin-bottom: 10px;
  color: var(--text-primary);
  letter-spacing: -0.025em;
}

.section-subtitle {
  font-size: 1.02rem;
  color: var(--text-secondary);
  margin-bottom: 48px;
  max-width: 620px;
}

/* ============================================
   Section header — numbered editorial style
   ============================================ */

.section-header {
  margin-bottom: 48px;
  max-width: 720px;
}

.section-header .accent-line {
  width: 40px;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 2px;
  margin-bottom: 18px;
  position: relative;
}

.section-header .accent-line::after {
  content: '';
  position: absolute;
  left: 0;
  top: -2px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
}

/* Numbered variant — "01 / Compute Infrastructure" */
.section-header.is-numbered {
  max-width: none;
}

.section-header.is-numbered .accent-line {
  display: none;
}

.section-index {
  display: block;
  width: fit-content;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-bright);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.section-index::after {
  content: '';
  display: inline-block;
  width: 40px;
  height: 1px;
  background: var(--accent);
  opacity: 0.4;
  margin-left: 14px;
  vertical-align: middle;
}

.section-header.is-numbered .section-title {
  margin-bottom: 10px;
}

.section-header.is-numbered .section-subtitle {
  margin-top: 0;
}

/* ============================================
   Gradient divider
   ============================================ */

.gradient-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(6, 182, 212, 0.4), rgba(139, 92, 246, 0.4), transparent);
  opacity: 0.7;
  margin: 0 auto;
  max-width: var(--container-max);
  position: relative;
}

.gradient-divider::after {
  content: '';
  position: absolute;
  left: 50%;
  top: -2px;
  transform: translateX(-50%);
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--neon-cyan);
  box-shadow: 0 0 10px var(--neon-cyan);
}

/* ============================================
   Table wrap — horizontal scroll on small screens
   ============================================ */

.table-wrap {
  overflow-x: auto;
  margin: 0 -24px;
  padding: 0 24px;
  -webkit-overflow-scrolling: touch;
}

.table-wrap::-webkit-scrollbar {
  height: 6px;
}

.table-wrap .data-table {
  min-width: 520px;
}

/* ============================================
   Utility: centered CTA container
   ============================================ */

.cta-center {
  text-align: center;
  margin-top: 40px;
}

/* ============================================
   Footer
   ============================================ */

.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: linear-gradient(180deg, transparent, rgba(139, 92, 246, 0.03));
  padding: 56px 0 32px;
  color: var(--text-muted);
  font-size: 0.83rem;
  line-height: 1.8;
  position: relative;
  z-index: 1;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 240px;
  height: 1px;
  background: var(--gradient-hero);
  opacity: 0.5;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 36px;
}

.footer-col h4 {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: 12px;
  font-weight: 600;
}

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

.footer-col li {
  margin-bottom: 6px;
}

.footer-col a {
  color: var(--text-muted);
  font-size: 0.83rem;
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: var(--text-primary);
}

.footer-brand .logo {
  margin-bottom: 12px;
  font-size: 0.95rem;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.8rem;
  line-height: 1.6;
  max-width: 280px;
}

.footer-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  margin-top: 14px;
  border-radius: 100px;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.22);
  color: var(--neon-green-bright);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.footer-status .pulse-dot {
  width: 6px;
  height: 6px;
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ============================================
   Back-to-top button (injected by JS)
   ============================================ */

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base), border-color var(--transition-fast), background var(--transition-fast);
  z-index: 80;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  border-color: var(--accent);
  background: rgba(var(--accent-rgb), 0.1);
  color: var(--accent-bright);
}

.back-to-top svg {
  width: 18px;
  height: 18px;
  stroke-width: 2;
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
  :root {
    --section-pad-y: 64px;
    --section-pad-y-tight: 44px;
  }

  .section-title {
    font-size: 1.7rem;
  }

  .section-subtitle {
    margin-bottom: 36px;
  }

  .nav-links {
    display: none;
  }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(7, 7, 12, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    padding: 12px;
    gap: 2px;
  }

  .nav-links.open a {
    display: block;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
  }

  .nav-links.open a.active::after {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .section-header.is-numbered .section-index::after {
    display: none;
  }
}

/* ============================================
   Print — paper-friendly
   ============================================ */

@media print {
  body {
    background: #fff;
    color: #000;
    overflow: visible;
  }

  body::before,
  body::after,
  .disclaimer-bar,
  .site-header,
  .back-to-top,
  .gradient-divider::after {
    display: none !important;
  }

  .section {
    padding: 24px 0 !important;
    break-inside: avoid;
  }

  .section-title {
    color: #000;
  }

  .site-footer {
    border-top: 1px solid #000;
    background: none;
    color: #000;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  .data-table,
  .feature-card,
  .info-box,
  .metric-card {
    border: 1px solid #ccc !important;
    background: #fff !important;
    box-shadow: none !important;
  }
}