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

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--hud);
  background: var(--void);
  background-image:
    radial-gradient(ellipse 90% 55% at 50% -18%, rgba(0, 229, 184, 0.1), transparent 55%),
    radial-gradient(ellipse 55% 45% at 100% 20%, rgba(123, 97, 255, 0.08), transparent 50%),
    radial-gradient(ellipse 45% 40% at 0% 80%, rgba(255, 45, 85, 0.04), transparent 45%);
  overflow-x: hidden;
}

/* Ambient telemetry grid — subtle institutional depth */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(0, 229, 184, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 184, 0.03) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 20%, transparent 75%);
}

body.is-ready {
  /* hooks post-load polish */
}

body.header-scrolled .site-header {
  background: rgba(5, 8, 15, 0.82);
  border-bottom-color: rgba(0, 229, 184, 0.22);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

img,
svg,
video {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--telemetry);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

a:hover {
  color: #7af0ff;
}

:focus-visible {
  outline: 2px solid var(--telemetry);
  outline-offset: 3px;
}

.form-error {
  min-height: 0;
}

.form-group.has-error .form-error {
  display: block;
}

/* Visually hidden but available to AT when used as live region children */
.form-success[tabindex="-1"]:focus {
  outline: 2px solid var(--telemetry);
  outline-offset: 2px;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.02em;
  margin: 0 0 0.6em;
  color: var(--hud);
}

h1 {
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.35rem);
}

h3 {
  font-size: clamp(1.15rem, 2vw, 1.4rem);
}

p {
  margin: 0 0 1em;
  color: var(--muted);
}

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

ul,
ol {
  margin: 0 0 1em;
  padding-left: 1.25em;
  color: var(--muted);
}

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

code,
.mono {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

::selection {
  background: var(--telemetry-dim);
  color: var(--hud);
}

.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.section {
  padding: var(--space-8) 0;
  position: relative;
}

.section--tight {
  padding: var(--space-7) 0;
}

.section--flush {
  padding: 0;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100px;
  z-index: 2000;
  padding: 0.6rem 1rem;
  background: var(--telemetry);
  color: var(--void);
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  top: 1rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.telemetry-grid {
  position: relative;
}

.telemetry-grid::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black, transparent);
  opacity: 0.35;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--telemetry);
  margin-bottom: 0.85rem;
}

.eyebrow::before {
  content: "";
  width: 1.5rem;
  height: 2px;
  background: var(--grad-signal);
  border-radius: 2px;
}

.lead {
  font-size: 1.125rem;
  max-width: 40rem;
  color: var(--muted);
}

.text-center {
  text-align: center;
}

.text-center .lead {
  margin-inline: auto;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-5);
}

@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .section {
    padding: var(--space-7) 0;
  }
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  filter: blur(2px);
  transition:
    opacity 0.85s var(--ease-out, var(--ease)),
    transform 0.85s var(--ease-out, var(--ease)),
    filter 0.85s var(--ease-out, var(--ease));
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
  filter: none;
}

.reveal-delay-1 {
  transition-delay: 0.1s;
}

.reveal-delay-2 {
  transition-delay: 0.2s;
}

.reveal-delay-3 {
  transition-delay: 0.3s;
}

.reveal-delay-4 {
  transition-delay: 0.4s;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
    filter: none;
  }

  body::before {
    display: none;
  }
}