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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: #0f172a;
  color: #e2e8f0;
}

.placeholder { text-align: center; padding: 2rem; }
.placeholder p { margin-top: 0.75rem; color: #94a3b8; }