:root {
  --bg: #0e1116;
  --fg: #e8eaed;
  --muted: #8a919c;
  --accent: #6fd3c7;
}

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

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  text-align: center;
}

h1 {
  font-size: clamp(2rem, 7vw, 3.5rem);
  font-weight: 300;
  letter-spacing: 0.08em;
}

p {
  margin-top: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-size: 0.85rem;
}

.rings {
  position: relative;
  width: 96px;
  height: 96px;
  margin-bottom: 2rem;
}

.rings span {
  position: absolute;
  inset: 0;
  border: 1px solid var(--accent);
  border-radius: 50%;
  opacity: 0;
  animation: echo 3.6s ease-out infinite;
}

.rings span:nth-child(2) { animation-delay: 1.2s; }
.rings span:nth-child(3) { animation-delay: 2.4s; }

@keyframes echo {
  0%   { transform: scale(0.2); opacity: 0.9; }
  100% { transform: scale(1.6); opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .rings span { animation: none; opacity: 0.5; }
}

footer {
  padding: 16px;
  text-align: center;
  color: var(--muted);
  font-size: 0.75rem;
}