/* ===== GENERAL ===== */
* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #2196f3, #21cbf3);
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ===== CONTENEDOR PRINCIPAL ===== */
body > section {
  width: 100%;
  max-width: 500px;
  padding: 20px;
  background-color: rgba(0, 0, 0, 0.5);
  border-radius: 15px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.4);
  margin-top: auto;
  margin-bottom: auto;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* ===== ENTRADAS ===== */
input, select {
  width: 100%;
  padding: 12px;
  margin: 10px 0;
  font-size: 18px;
  border: none;
  border-radius: 8px;
}

/* ===== BOTONES ===== */
button {
  width: 100%;
  background-color: #ffeb3b;
  color: #333;
  font-weight: bold;
  font-size: 18px;
  padding: 12px;
  margin: 10px 0;
  border: none;
  border-radius: 25px;
  cursor: pointer;
  transition: background-color 0.3s;
}

button:hover {
  background-color: #fdd835;
}

/* ===== VENTANAS MODALES (ayuda, contrato) ===== */
#ventanaAyuda,
#ventanaContrato {
  background-color: #fff;
  color: #000;
  padding: 20px;
  border-radius: 15px;
  width: 90%;
  max-width: 500px;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  position: fixed;
  top: 10%;
  left: 0;
  right: 0;
  margin: auto;
  z-index: 9999;
  text-align: left;
}

#ventanaContrato p, #ventanaAyuda p {
  font-size: 16px;
  line-height: 1.5;
}

/* ===== TÍTULOS ===== */
h2, h3 {
  margin-top: 0;
  font-size: 24px;
  text-align: center;
}

/* ===== pantallas pequeñas ===== */
section {
  max-width: 90vw;
  width: 100%;
  box-sizing: border-box;
}

@media (max-width: 600px) {
  input, select, button {
    width: 95%;
    font-size: 16px;
  }

  h2, h3 {
    font-size: 20px;
  }

  #ventanaContrato {
    width: 95%;
    max-height: 80vh;
  }
}