* {
  box-sizing: border-box;
  font-family: Inter, system-ui, sans-serif;
}

body {
  margin: 0;
  background: #0f141a;
  color: #f4f5f7;
}

header {
  padding: 1rem 2rem;
  background: linear-gradient(90deg, #1d2734, #0d121b);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}

h1 {
  margin: 0;
  font-size: 1.5rem;
}

header p {
  margin: 0;
  color: #9da8b7;
}

main {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem;
}

#status {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
  color: #a5c9ff;
}

#topology {
  width: min(100%, 1100px);
  background: #111827;
  border-radius: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 25px 45px rgba(5, 5, 5, 0.4);
}

circle {
  stroke: #fff;
  stroke-width: 1;
}

button {
  border: none;
  border-radius: 999px;
  padding: 0.5rem 1rem;
  background: #2563eb;
  color: white;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 20px rgba(37, 99, 235, 0.35);
}