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

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

body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 12% 18%, rgba(var(--electric-blue-rgb), 0.06), transparent 27rem),
    radial-gradient(circle at 88% 63%, rgba(var(--electric-blue-rgb), 0.045), transparent 32rem),
    var(--background);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body.menu-open,
body.interface-open {
  overflow: hidden;
}

::selection {
  background: rgba(var(--electric-blue-rgb), 0.28);
  color: var(--text-primary);
}

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

button,
input,
textarea {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

button:not(:disabled),
[role="button"]:not([aria-disabled="true"]) {
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

p,
h1,
h2,
h3,
h4,
ul,
ol,
dl,
dd,
figure,
blockquote {
  margin: 0;
}

ul,
ol {
  padding: 0;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  line-height: 1.05;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

h2 {
  font-size: var(--step-4);
}

h3 {
  font-size: var(--step-2);
}

p {
  color: var(--text-secondary);
  text-wrap: pretty;
}

main,
footer,
.site-header {
  position: relative;
  z-index: 2;
}

section {
  position: relative;
}

:focus-visible {
  outline: 2px solid var(--electric-blue);
  outline-offset: 4px;
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 1000;
  padding: 0.7rem 1rem;
  transform: translateY(-160%);
  border: var(--border-strong);
  border-radius: var(--radius-small);
  background: var(--surface);
  color: var(--text-primary);
  transition: transform var(--duration-fast) var(--ease-standard);
}

.skip-link:focus {
  transform: translateY(0);
}

.network-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.72;
}

.page-grid {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.45;
  background-image:
    linear-gradient(var(--line-faint) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-faint) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.82), transparent 88%);
}

.scroll-progress {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: 2px;
  background: transparent;
  pointer-events: none;
}

.scroll-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--electric-blue);
  box-shadow: 0 0 18px rgba(var(--electric-blue-rgb), 0.5);
  transform-origin: left center;
}

.layer {
  width: min(var(--content-width), calc(100% - 3rem));
  margin-inline: auto;
  padding-block: var(--space-9);
}

.layer + .layer {
  border-top: 1px solid var(--line-faint);
}

.layer-index {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  margin-bottom: var(--space-6);
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.layer-index::before {
  width: 2.2rem;
  height: 1px;
  content: "";
  background: var(--line-strong);
}

.layer-index span:first-child {
  color: var(--electric-blue);
}

.layer-heading {
  max-width: 60rem;
  margin-bottom: var(--space-7);
}

.layer-heading h2 {
  max-width: 18ch;
}

.layer-heading > p:last-child {
  max-width: 52rem;
  margin-top: var(--space-4);
  font-size: var(--step-1);
}

.layer-heading--split {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(20rem, 0.8fr);
  align-items: end;
  max-width: none;
  gap: var(--space-7);
}

.layer-heading--split > p:last-child {
  margin-top: 0;
}

.eyebrow,
.technical-label {
  color: var(--electric-blue);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.eyebrow {
  margin-bottom: var(--space-3);
}

.signal-state {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.signal-state::before {
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 50%;
  content: "";
  background: currentColor;
  box-shadow: 0 0 12px currentColor;
}

.button,
.text-link,
.icon-button,
.filter-button,
.theme-toggle,
.menu-toggle,
.back-to-top {
  border: 0;
  background: none;
}

.button {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  justify-content: center;
  padding: 0.78rem 1.2rem;
  border: 1px solid transparent;
  border-radius: var(--radius-small);
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1;
  transition:
    transform var(--duration-fast) var(--ease-standard),
    border-color var(--duration-fast) ease,
    background-color var(--duration-fast) ease,
    color var(--duration-fast) ease,
    box-shadow var(--duration-fast) ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button--primary {
  background: var(--electric-blue);
  color: #03111c;
  box-shadow: var(--shadow-blue);
}

html[data-theme="light"] .button--primary {
  color: white;
}

.button--primary:hover {
  background: color-mix(in srgb, var(--electric-blue) 86%, white);
}

.button--outline {
  border-color: var(--line-strong);
  background: rgba(var(--surface-rgb), 0.42);
  color: var(--text-primary);
}

.button--outline:hover {
  border-color: var(--electric-blue);
  background: rgba(var(--electric-blue-rgb), 0.08);
}

.button--compact {
  min-height: 2.55rem;
  padding-inline: 0.95rem;
  font-size: 0.82rem;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.3rem 0;
  color: var(--text-primary);
  font-weight: 700;
}

.text-link span {
  color: var(--electric-blue);
  transition: transform var(--duration-fast) var(--ease-standard);
}

.text-link:hover span {
  transform: translate(2px, -2px);
}

.inline-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.status-dot {
  display: inline-block;
  width: 0.52rem;
  height: 0.52rem;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 14px rgba(85, 214, 167, 0.55);
}