:root {
  --fondo: #e6e2db;
  --papel: #f8f2e5;
  --texto: #3f281c;
  --texto-suave: #7a5a49;
  --granate: #a83b50;
  --granate-oscuro: #742a3b;
  --sombra: rgba(60, 35, 20, 0.18);
  --borde: rgba(107, 76, 54, 0.22);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--texto);
  font-family: Georgia, 'Times New Roman', serif;
  background:
    radial-gradient(circle at top left, rgba(168, 59, 80, 0.12), transparent 32rem),
    radial-gradient(circle at bottom right, rgba(92, 57, 36, 0.12), transparent 28rem),
    var(--fondo);
}

.cabecera {
  width: min(92%, 900px);
  margin: 0 auto;
  padding: 42px 0 24px;
  text-align: center;
}

.subtitulo {
  margin: 0 0 10px;
  color: var(--granate);
  font-size: 0.86rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2.4rem, 8vw, 5rem);
  line-height: 0.95;
  font-weight: 700;
}

.descripcion {
  max-width: 520px;
  margin: 18px auto 0;
  color: var(--texto-suave);
  font-size: 1rem;
  letter-spacing: 0.06em;
}

.acciones {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 26px;
}

.boton {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--granate);
  border-radius: 999px;
  background: var(--granate);
  color: #fff8ec;
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 700;
  box-shadow: 0 8px 20px rgba(120, 50, 50, 0.18);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.boton:hover {
  transform: translateY(-2px);
  background: var(--granate-oscuro);
  box-shadow: 0 10px 26px rgba(120, 50, 50, 0.25);
}

.boton-secundario {
  background: transparent;
  color: var(--granate-oscuro);
}

.boton-secundario:hover {
  color: #fff8ec;
}

.contenedor-carta {
  width: min(94%, 820px);
  margin: 10px auto 50px;
}

.pagina-carta {
  margin: 0 auto 28px;
  border: 1px solid var(--borde);
  border-radius: 22px;
  background: var(--papel);
  box-shadow: 0 16px 50px var(--sombra);
  overflow: hidden;
}

.pagina-carta img {
  display: block;
  width: 100%;
  height: auto;
}

.boton-subir {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 20;
  width: 46px;
  height: 46px;
  border: 1px solid rgba(255, 248, 236, 0.55);
  border-radius: 50%;
  background: var(--granate);
  color: #fff8ec;
  font-size: 1.4rem;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  box-shadow: 0 10px 28px rgba(70, 35, 35, 0.24);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.boton-subir.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.pie {
  padding: 0 0 34px;
  text-align: center;
  color: var(--texto-suave);
  font-size: 0.9rem;
}

@media (max-width: 640px) {
  .cabecera {
    padding-top: 30px;
  }

  .contenedor-carta {
    width: calc(100% - 24px);
    margin: 10px auto 34px;
  }

  .pagina-carta {
    margin-bottom: 16px;
    border: 1px solid var(--borde);
    border-radius: 16px;
    box-shadow: 0 10px 24px rgba(60, 35, 20, 0.12);
  }

  .acciones {
    padding: 0 14px;
  }

  .boton {
    flex: 1 1 160px;
  }
}