body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 40px auto;
  max-width: 900px;
  background-color: #f5f8fa;
  color: #222;
  line-height: 1.6;
  padding: 0 20px;
}

h1 {
  color: #1e3799;
  text-align: center;
  margin-bottom: 40px;
  font-weight: 800;
  font-size: 2.6rem;
}

form {
  background-color: #fff;
  padding: 30px 40px;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

label {
  display: block;
  font-weight: 600;
  margin: 10px 0 6px;
  color: #34495e;
}

input[type="text"],
input[type="email"],
select {
  width: 96%;
  padding: 12px 14px;
  border: 1.8px solid #d1d8e0;
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.3s ease;
}

input:focus,
select:focus {
  border-color: #3c6382;
  outline: none;
  box-shadow: 0 0 8px #3c6382aa;
}

textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1.8px solid #d1d8e0;
  border-radius: 8px;
  font-size: 1rem;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  transition: border-color 0.3s ease;
  resize: vertical;
  min-height: 120px;
  box-sizing: border-box;
}

textarea:focus {
  border-color: #3c6382;
  outline: none;
  box-shadow: 0 0 8px #3c6382aa;
}

select {
  width: 100%;
  padding: 12px 14px;
  border: 1.8px solid #d1d8e0;
  border-radius: 8px;
  font-size: 1rem;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: white;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url('data:image/svg+xml;charset=US-ASCII,<svg xmlns="http://www.w3.org/2000/svg" width="12" height="8"><path fill="%233c6382" d="M1 0l5 5 5-5z"/></svg>');
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 12px 8px;
}

select:focus {
  border-color: #3c6382;
  outline: none;
  box-shadow: 0 0 8px #3c6382aa;
}

.submit-btn {
  background-color: #3867d6;
  color: white;
  border: none;
  border-radius: 8px;
  padding: 14px 28px;
  font-size: 1.1rem;
  font-weight: 700;
  margin: 30px auto;
  display: block;
  width: 100%;
  max-width: 360px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.submit-btn:hover {
  background-color: #2f54c1;
}

.hidden {
  display: none;
}

#barra-progreso-container {
  width: 100%;
  background-color: #dbe4f3;
  height: 10px;
  border-radius: 20px;
  margin: 30px 0;
  overflow: hidden;
}

#barra-progreso {
  height: 100%;
  background-color: #3867d6;
  width: 0%;
  transition: width 0.4s ease;
}

#contador-pregunta {
  text-align: right;
  font-weight: 600;
  margin-bottom: 10px;
  color: #34495e;
}

@media (max-width: 600px) {
  form {
    padding: 20px;
  }
  h1 {
    font-size: 2rem;
  }
  .submit-btn {
    padding: 12px 24px;
    font-size: 1rem;
  }
}