:root {
  --bg0: #02020a;
  --bg1: #020614;
  --ink: #e9fff9;
  --muted: rgba(233, 255, 249, .7);
  --line: rgba(182, 255, 234, .18);
  --neonA: #b6ffea;
  --neonB: #75d7ff;
  --pink: #ff4fd8;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --max-width: 1040px;
}

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

html, body {
  height: 100%;
}

body {
  margin: 0;
  background:
    radial-gradient(900px 600px at 20% 10%, rgba(117, 215, 255, .08), transparent 60%),
    radial-gradient(1200px 800px at 60% 120%, rgba(255, 79, 216, .06), transparent 60%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
  color: var(--ink);
  font: 15px/1.55 system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.bg-drift {
  position: fixed;
  inset: -20%;
  background:
    radial-gradient(800px 600px at 30% 30%, rgba(117, 215, 255, .06), transparent 60%),
    radial-gradient(1000px 700px at 70% 40%, rgba(182, 255, 234, .06), transparent 60%);
  animation: drift 42s linear infinite;
  z-index: -2;
  pointer-events: none;
}

@keyframes drift {
  0% { transform: translate(-0.4%, -0.3%) scale(1.02); }
  50% { transform: translate(0.3%, 0.4%) scale(1.03); }
  100% { transform: translate(-0.4%, -0.3%) scale(1.02); }
}

.scan {
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    180deg,
    rgba(255, 255, 255, .03) 0,
    rgba(255, 255, 255, .03) 1px,
    transparent 2px,
    transparent 7px
  );
  opacity: .12;
  pointer-events: none;
  z-index: -1;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 22px;
}

/* Navigation */
nav {
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
  background: rgba(2, 2, 10, .55);
  border-bottom: 1px solid var(--line);
  z-index: 100;
}

nav .nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 22px;
  max-width: var(--max-width);
  margin: 0 auto;
}

nav .nav-brand {
  font-family: var(--font-mono);
  font-weight: 900;
  letter-spacing: .5px;
  text-shadow: 0 0 24px rgba(182, 255, 234, .18);
  color: var(--ink);
  text-decoration: none;
}

nav .nav-brand .zero {
  color: var(--neonA);
  text-shadow:
    0 0 28px rgba(182, 255, 234, .4),
    0 0 10px rgba(117, 215, 255, .3);
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0;
}

nav ul a {
  color: var(--muted);
  text-decoration: none;
  padding: 8px 14px;
  transition: color 0.15s ease;
}

nav ul a:hover,
nav ul a[aria-current="page"] {
  color: var(--ink);
}

/* Main content */
main {
  flex: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 56px 22px 72px;
}

/* Footer */
footer {
  padding: 24px 22px;
  text-align: center;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

/* Typography */
h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.2;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

h1 {
  font-size: clamp(32px, 4vw, 48px);
  margin-top: 0;
  line-height: 1.08;
}

h1 .neon {
  color: var(--neonB);
  text-shadow: 0 0 32px rgba(117, 215, 255, .3);
}

h2 {
  font-size: 1.25rem;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.5rem;
  margin-top: 3rem;
}

h3 {
  font-size: 1rem;
  color: var(--neonA);
  margin-top: 1.5rem;
}

p {
  margin: 1rem 0;
  color: rgba(233, 255, 249, .85);
}

.lead {
  font-size: 1.1rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
  max-width: 60ch;
}

.statement {
  font-style: italic;
  color: var(--muted);
  border-left: 2px solid var(--line);
  padding-left: 1rem;
  margin: 1.5rem 0;
}

ul, ol {
  margin: 1rem 0;
  padding-left: 1.5rem;
}

li {
  margin: 0.5rem 0;
  color: rgba(233, 255, 249, .85);
}

a {
  color: var(--neonA);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 2rem 0;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: rgba(182, 255, 234, .08);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  color: var(--neonA);
}

/* Section navigation */
.section-nav {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.section-nav a {
  display: block;
  padding: 16px 18px;
  background: rgba(2, 2, 10, .45);
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
  transition: border-color 0.15s ease, background 0.15s ease;
}

.section-nav a:hover {
  border-color: var(--neonA);
  background: rgba(182, 255, 234, .04);
  text-decoration: none;
}

.section-nav .nav-description {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.35rem;
}

/* Breadcrumb */
.breadcrumb {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.breadcrumb a {
  color: var(--muted);
}

.breadcrumb a:hover {
  color: var(--ink);
}

/* Status labels */
.status-label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 500;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-left: 0.5rem;
  vertical-align: middle;
}

.status-operational {
  background: rgba(182, 255, 234, .15);
  color: var(--neonA);
}

.status-experimental {
  background: rgba(117, 215, 255, .15);
  color: var(--neonB);
}

.status-conceptual {
  background: rgba(255, 79, 216, .15);
  color: var(--pink);
}

/* Hero section for landing */
.hero {
  margin-bottom: 2rem;
}

.hero h1 {
  font-size: clamp(36px, 5vw, 58px);
  line-height: 1.03;
}

/* Card */
.card {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(2, 2, 10, .45);
  padding: 20px;
  margin: 1.5rem 0;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
  font-size: 0.9rem;
  transition: background 0.15s ease;
}

.btn:hover {
  background: rgba(182, 255, 234, .06);
  text-decoration: none;
}

.btnrow {
  display: flex;
  gap: 10px;
  margin-top: 1.5rem;
}

/* Responsive */
@media (max-width: 640px) {
  nav .nav-inner {
    flex-direction: column;
    gap: 1rem;
    padding: 12px 16px;
  }

  nav ul {
    gap: 0;
    flex-wrap: wrap;
    justify-content: center;
  }

  main {
    padding: 32px 16px 48px;
  }

  h1 {
    font-size: 1.75rem;
  }

  .section-nav a {
    padding: 14px;
  }
}