/* Reset y box-sizing */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Fondo con gradiente */
body {
  min-height: 100vh;
  background: linear-gradient(to bottom, #333, #000);
  color: white;
  display: flex;
  flex-direction: column;
  font-size: 16px;
  line-height: 1.5;
}

/* Contenedor header */
.contenedor {
  position: sticky;
  top: 0;
  z-index: 30;
  background-color: rgba(0, 0, 0, 0.85);
}

/* Barra de navegación */
.encabezado {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  padding: 0 20px;
  border-bottom: 1px solid #29ffc9;
}

.encabezado__titulo {
  font-size: 28px;
  color: #f4f4f2;
}

.encabezado__contorno {
  color: #1ceb25;
  font-weight: 700;
}

.encabezado__botones {
  color: #f4f4f2;
  text-decoration: none;
  padding: 8px 15px;
  margin-left: 12px;
  font-size: 18px;
  border-radius: 20px;
  transition: all 0.3s ease;
  user-select: none;
}

.encabezado__botones:hover {
  background-color: #243a69;
  color: #1ceb25;
  outline: 2px solid #06d9b6;
  box-shadow: 0 0 10px white;
}

.boton--inicio {
  background-color: #1ceb25;
  color: #000;
}

.boton--inicio:hover {
  outline: 2px solid #f4f4f2;
  box-shadow: 0 0 15px #1ceb25;
}

.nav-responsive {
  display: none;
  font-size: 28px;
  color: #f4f4f2;
  cursor: pointer;
}

/* Formulario principal */
.formulario {
  flex: 1;
  max-width: 480px;
  background-color: rgba(0, 0, 0, 0.8);
  margin: 60px auto 40px;
  padding: 30px 25px;
  border-radius: 15px;
  box-shadow: 0 0 25px rgba(255, 255, 255, 0.2);
}

.contenedor1__titulo {
  text-align: center;
  font-size: 32px;
  text-transform: uppercase;
  margin-bottom: 25px;
  color: #1ceb25;
  text-shadow: 0 0 10px #1ceb25;
}

/* Fieldsets */
fieldset {
  border: 1px solid white;
  border-radius: 8px;
  margin-bottom: 25px;
  padding: 20px 25px;
  color: white;
}

legend {
  font-weight: 700;
  text-transform: uppercase;
  padding: 0 15px;
  font-size: 18px;
  border: 1px solid white;
  border-radius: 6px;
  box-shadow: 0 0 5px white;
}

/* Inputs, select, textarea */
.input-group {
  margin-bottom: 15px;
  display: flex;
  flex-direction: column;
}

label {
  text-transform: uppercase;
  margin-bottom: 6px;
  font-weight: 600;
  color: #ddd;
}

.datos, textarea, select {
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid white;
  background-color: transparent;
  color: #eee;
  font-size: 16px;
  box-shadow: 0 0 5px yellow;
  transition: border-color 0.3s ease;
}

.datos:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: #1ceb25;
  box-shadow: 0 0 10px #1ceb25;
}

option {
  background-color: #222;
}

textarea {
  min-height: 100px;
  max-height: 200px;
  resize: vertical;
}

/* Checkbox styling */
.checkbox-group {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 15px;
}

.checkbox-group label {
  text-transform: none;
  font-weight: 400;
  color: #eee;
  margin-bottom: 0;
}

/* Botón enviar */
.btn-enviar {
  margin-top: 15px;
  width: 100%;
  background-color: #1ceb25;
  color: #000;
  font-weight: 700;
  font-size: 18px;
  padding: 12px 0;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: 0 0 15px #1ceb25;
  transition: background-color 0.3s ease;
}

.btn-enviar:hover {
  background-color: #16b816;
  box-shadow: 0 0 20px #16b816;
}

/* Mensajes de error */
.error {
  color: #ff4444;
  font-size: 14px;
  margin-top: 3px;
  min-height: 18px;
}

/* Footer */
.pie {
  background-color: #000;
  color: white;
  text-align: center;
  padding: 25px 15px 40px;
  font-size: 14px;
  user-select: none;
}

.final {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 40px;
  margin-bottom: 15px;
}

.final h2 {
  font-weight: 400;
  font-size: 14px;
  user-select: none;
}

.final--1 {
  border-top: 1px solid white;
  padding-top: 12px;
}

.final--copi {
  text-transform: uppercase;
}

/* Responsive */

@media (max-width: 600px) {
  .formulario {
    margin: 30px 15px;
    padding: 20px 15px;
  }

  .encabezado__botones {
    font-size: 16px;
    padding: 8px 10px;
    margin-left: 6px;
  }

  .encabezado__titulo {
    font-size: 24px;
    margin: 0 10px;
  }

  .btn-enviar {
    font-size: 16px;
  }
}

@media (max-width: 400px) {
  .formulario {
    margin: 20px 10px;
    padding: 15px 10px;
  }

  .encabezado__botones {
    font-size: 14px;
    padding: 6px 8px;
    margin-left: 4px;
  }

  .encabezado__titulo {
    font-size: 20px;
  }
}