* { box-sizing: border-box; }
body {
  font-family: -apple-system, system-ui, Segoe UI, Roboto, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.panel {
  max-width: 480px;
  text-align: center;
  padding: 40px 24px;
}
h1 { font-size: 26px; margin-bottom: 8px; }
p { color: #94a3b8; font-size: 15px; margin-bottom: 24px; }
.boton {
  display: inline-block;
  padding: 13px 28px;
  border-radius: 8px;
  background: #22c55e;
  color: #0f172a;
  font-weight: 600;
  font-size: 16px;
  text-decoration: none;
}
.boton:hover { background: #16a34a; }