.header-title {
  background: linear-gradient(135deg, #1f2937, #374151);
  padding: .6em 0;
  border-bottom: 4px solid #d1d5db;
}

.header-title h1 {
  font-weight: 600;
  font-size: 24px;
  text-align: center;
  color: #f9fafb;
  letter-spacing: .5px;
}

.card {
  border: none;
  border-radius: 14px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.08);
  background: #ffffff;
  overflow: hidden;
}

/* TITULOS */
.section-title {
  text-align: center;
  font-size: 18px;
  font-weight: 600;
  color: #1f2937;
  margin-bottom: 12px;
}

.section-subtitle {
  text-align: center;
  font-size: 15px;
  color: #4b5563;
  margin-bottom: 25px;
}

/* FORM */
.form-group-flotante {
  position: relative;
  margin-bottom: 1.8rem;
  /* MÁS SEPARACIÓN */
}

.form-group-flotante input {
  width: 100%;
  height: 50px;
  border-radius: 10px;
  border: 1px solid #d1d5db;
  padding: 14px 12px;
  background: #f9fafb;
  transition: all .2s ease;

  /* TEXTO MÁS LEGIBLE */
  font-size: 15px;
  font-weight: 500;
  color: #111827;
}

.form-group-flotante label {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  font-weight: 500;
  /* MÁS GRUESO */
  color: #4b5563;
  background: transparent;
  padding: 0 5px;
  transition: all .2s ease;
  pointer-events: none;
}

/* FLOAT */
.form-group-flotante input:focus+label,
.form-group-flotante input:not(:placeholder-shown)+label {
  top: -8px;
  font-size: 12px;
  background: #fff;
  color: #1d4ed8;
}

/* FOCUS */
.form-group-flotante input:focus {
  border-color: #1d4ed8;
  background: #fff;
  box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.15);
  outline: none;
}

/* CAPTCHA */
#etqCaptcha {
  background: #f9fafb;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid #e5e7eb;
}

#etqCaptcha img {
  height: 45px;
  border-radius: 6px;
}

.btn-primary {
  height: 48px;
  border-radius: 10px;
  font-weight: 800;
  font-size: 16px;
  letter-spacing: .5px;
  color: #eaf2ff;
  background: linear-gradient(135deg, #1e40af, #1e3a8a);
  border: none;
  transition: all .2s ease;
}

.btn-primary:hover {
  background: linear-gradient(135deg, #1e3a8a, #172554);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.25);
}

.btn-primary:active {
  transform: scale(0.97);
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
}