:root {
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: #fff;
  color: #000;
  font-family: Arial, Helvetica, sans-serif;
}

.pantalla-principal {
  min-height: 100vh;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
}

.logo {
  display: block;
  width: min(82vw, 82vh, 900px);
  max-height: 72vh;
  object-fit: contain;
}

.cuenta-regresiva {
  text-align: center;
}

.titulo {
  margin: 0 0 0.35rem;
  font-size: clamp(1rem, 2vw, 1.25rem);
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.contador {
  margin: 0 0 1.25rem;
  font-size: clamp(1.75rem, 5vw, 4rem);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.07em;
}

.boton {
  display: inline-block;
  padding: 0.9rem 1.5rem;
  border-radius: 0.45rem;
  background: #000;
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  transition: transform 160ms ease, background 160ms ease;
}

.boton:hover,
.boton:focus-visible {
  background: #333;
  transform: translateY(-2px);
}

@media (max-width: 500px) {
  .pantalla-principal {
    padding: 1.25rem;
  }

  .logo {
    width: min(92vw, 68vh);
  }
}