body {
      background-color: #0f1519;
      color: white;
      font-family: Arial, sans-serif;
      margin: 0;
      padding: 20px;
      display: flex;
      flex-direction: column;
      align-items: center;
      min-height: 100vh;
    }
    h1 {
      font-family: 'Cinzel', serif;
      font-size: 48px;
      font-weight: 700;
      color: #FFD700;
      margin-bottom: 40px;
      text-align: center;
      text-shadow: 2px 2px 5px rgba(0,0,0,0.7);
    }
    .opciones-donacion {
      display: flex;
      flex-direction: column;
      gap: 25px;
      max-width: 400px;
      width: 100%;
    }
    .opcion {
  display: block; /* para que el <a> se comporte como bloque */
  background: #1c252c;
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  box-shadow: 0 8px 16px rgba(0,0,0,0.6);
  transition: background-color 0.3s ease;
  cursor: pointer;
  user-select: none;
  color: white;
  text-decoration: none; /* quitar subrayado */
}
.opcion:hover {
  background-color: #af1e1e;
}
    .opcion a {
      color: white;
      text-decoration: none;
      font-size: 20px;
      font-weight: bold;
      display: block;
    }
    .opcion p {
  margin: 10px 0 0 0;
  font-size: 14px;
  color: #ccc;
}

    .cvu {
      font-family: monospace;
      font-size: 18px;
      background: #222;
      padding: 10px;
      border-radius: 8px;
      user-select: all;
      margin-top: 10px;
    }
    .cbu {
      font-family: monospace;
      font-size: 18px;
      background: #222;
      padding: 10px;
      border-radius: 8px;
      user-select: all;
      margin-top: 10px;
    }

.volver {
  display: block;
  margin: 40px auto;   /* ← CENTRADO REAL */
  
  background: linear-gradient(145deg, #1c2733, #121a22);
  border: 1px solid #2f3f50;
  font-size: 18px;
  color: #FFD700;
  border-radius: 8px;
  cursor: pointer;
  user-select: none;
  text-align: center;
  padding: 8px 18px;
  transition: all 0.25s ease;
}
.volver:hover {
  text-shadow: 0 0 8px #ffcc00;
  background: linear-gradient(145deg, #27374a, #1a2533);
  transform: translateY(-2px);
}