:root {
  --navy-deep: #081020;
  --navy: #0C1830;
  --panel: #101F3C;
  --signal-blue: #1E6FD9;
  --cyan: #38D6F5;
  --text: #E8F1FA;
  --text-dim: #8FA6C2;
  --line: rgba(56, 214, 245, 0.18);
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--navy-deep);
  background-image: radial-gradient(ellipse 80% 50% at 50% -10%, rgba(30, 111, 217, 0.22), transparent),
    radial-gradient(ellipse 60% 40% at 85% 100%, rgba(56, 214, 245, 0.07), transparent);
  color: var(--text);
  font-family: "IBM Plex Sans", sans-serif;
  line-height: 1.65;
  min-height: 100vh;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 6vw;
  border-bottom: 1px solid var(--line);
}

.wordmark-small {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: "Audiowide", cursive;
  font-size: 1.05rem;
  letter-spacing: 0.14em;
  background: linear-gradient(120deg, var(--signal-blue), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.mark-small {
  width: 28px;
  height: 28px;
}

.header-cta {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.85rem;
  color: var(--cyan);
  text-decoration: none;
  border: 1px solid var(--line);
  padding: 0.45rem 1rem;
  border-radius: 6px;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.header-cta:hover,
.header-cta:focus-visible {
  background: rgba(56, 214, 245, 0.1);
  border-color: var(--cyan);
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 6vw;
}

.hero {
  text-align: center;
  padding: 5rem 0 6rem;
}

.broadcast-mark {
  width: 150px;
  margin: 0 auto 1.5rem;
}

.arc {
  transform-origin: 100px 122px;
  animation: pulse 3.2s ease-in-out infinite;
  opacity: 0.9;
}

.arc-inner {
  animation-delay: 0.35s;
}

.node {
  filter: drop-shadow(0 0 14px rgba(56, 214, 245, 0.55));
}

@keyframes pulse {
  0%, 100% { opacity: 0.45; }
  40% { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .arc { animation: none; opacity: 1; }
}

.hero-title {
  font-family: "Audiowide", cursive;
  font-size: clamp(2.8rem, 9vw, 5.2rem);
  letter-spacing: 0.16em;
  background: linear-gradient(120deg, var(--signal-blue), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1rem;
}

.hero-tagline {
  font-size: clamp(1.15rem, 3vw, 1.5rem);
  font-weight: 600;
  margin-bottom: 1rem;
}

.hero-sub {
  color: var(--text-dim);
  max-width: 40rem;
  margin: 0 auto 2.25rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.95rem;
  text-decoration: none;
  padding: 0.8rem 1.7rem;
  border-radius: 8px;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn-primary {
  color: var(--navy-deep);
  background: linear-gradient(120deg, var(--signal-blue), var(--cyan));
  font-weight: 500;
  box-shadow: 0 0 22px rgba(56, 214, 245, 0.25);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 4px 30px rgba(56, 214, 245, 0.45);
}

.btn-ghost {
  color: var(--cyan);
  border: 1px solid var(--line);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background: rgba(56, 214, 245, 0.08);
}

.btn-large {
  display: inline-block;
  margin-top: 1.5rem;
  font-size: 1.05rem;
  padding: 1rem 2.2rem;
}

.eyebrow {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  color: var(--cyan);
  margin-bottom: 0.75rem;
}

section h2 {
  font-family: "Audiowide", cursive;
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  letter-spacing: 0.05em;
  margin-bottom: 1.25rem;
}

.about,
.stack,
.join {
  padding: 3.5rem 0;
  border-top: 1px solid var(--line);
}

.about p,
.join p {
  color: var(--text-dim);
  max-width: 44rem;
  margin-bottom: 1rem;
}

.about em {
  color: var(--text);
  font-style: italic;
}

.node-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}

.node-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.5rem;
  transition: border-color 0.2s ease, transform 0.15s ease;
}

.node-card:hover {
  border-color: rgba(56, 214, 245, 0.5);
  transform: translateY(-3px);
}

.node-status {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin-bottom: 0.6rem;
}

.node-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.node-card p:last-child {
  color: var(--text-dim);
  font-size: 0.92rem;
}

.join {
  text-align: center;
}

.join p {
  margin-left: auto;
  margin-right: auto;
}

.site-footer {
  text-align: center;
  padding: 2.5rem 6vw 3rem;
  border-top: 1px solid var(--line);
  color: var(--text-dim);
  font-size: 0.9rem;
}

.footer-fine {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  margin-top: 0.4rem;
  color: rgba(143, 166, 194, 0.6);
}

@media (max-width: 540px) {
  .hero {
    padding: 3.5rem 0 4rem;
  }
  .broadcast-mark {
    width: 110px;
  }
}