:root {
  --azul-corporativo: #002080;
  --amarillo-electrico: #ffcc00;
  --gris-neutro: #666666;
  --blanco: #ffffff;
  --gris-oscuro: #222222;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family:
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--blanco);
  color: var(--gris-neutro);
  line-height: 1.6;
}

/* 1. SECCIÓN HERO (assets/img/seccion1.jpg) */
.hero-section {
  height: 100vh;
  width: 100%;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 40px 50px;
  background-image: url("../img/seccion1.jpg");
  background-size: cover;
  background-position: center;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, #03a0fa, rgba(10, 10, 10, 0.8));
  z-index: 1;
}

.hero-header {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Logo en Hero con Zoom sin recortes */
.logo-container {
  display: flex;
  align-items: center;
  gap: 15px;
  text-decoration: none;
}

.logo-img {
  width: 55px;
  height: 55px;
  border-radius: 50%;
  transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1);
  will-change: transform;
}

.logo-container:hover .logo-img {
  transform: scale(1.15);
}

.logo-text {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--blanco);
  letter-spacing: 1px;
}

.logo-text span {
  color: var(--amarillo-electrico);
}

.hero-text-description {
  color: var(--blanco);
  font-size: 1.25rem;
  max-width: 750px;
}

/* Botón Contacto en Hero */
.btn-contacto-hero {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  background: transparent;
  border: 2px solid var(--amarillo-electrico);
  border-radius: 8px;
  color: var(--amarillo-electrico);
  padding: 5px 5px;
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  text-decoration: none;
  text-align: center;
  transition: all 0.3s ease;
}

.btn-contacto-hero:hover {
  background-color: var(--amarillo-electrico);
  color: var(--azul-corporativo);
  box-shadow: 0 0 15px rgba(255, 204, 0, 0.4);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 900px;
  margin: auto 0;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.1;
  color: var(--blanco);
  margin-bottom: 20px;
}

.hero-title span {
  color: var(--amarillo-electrico);
}

/* 2. SECCIONES ESTÁNDAR CON IMÁGENES DE FONDO */
section {
  min-height: 100vh;
  padding: 100px 20px 60px 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
}

#ia {
  background-image: url("../img/seccion2.jpg");
}
#ciberseguridad {
  background-image: url("../img/seccion3.jpg");
}
#iot {
  background-image: url("../img/seccion4.jpg");
}
#docencia {
  background-image: url("../img/seccion5.jpg");
}
#contacto {
  background-image: url("../img/seccion6.jpg");
}

.overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    135deg,
    rgba(0, 32, 128, 0.88),
    rgba(10, 10, 10, 0.8)
  );
  z-index: 1;
}

.section-container {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  width: 100%;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--amarillo-electrico);
  text-align: center;
  margin-bottom: 40px;
}

/* 3. CAJAS Y EFECTO ZOOM */
.card-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
}

.card-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 25px;
}

.card {
  background-color: var(--blanco);
  border-radius: 12px;
  padding: 30px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  border-left: 6px solid var(--azul-corporativo);
  transition:
    transform 0.4s cubic-bezier(0.165, 0.84, 0.44, 1),
    box-shadow 0.4s ease;
  will-change: transform;
}

.card.accent-border {
  border-left-color: var(--amarillo-electrico);
}

.card:hover {
  transform: scale(1.05);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
}

.card-number {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--azul-corporativo);
  margin-bottom: 10px;
}

.card-title {
  font-size: 1.4rem;
  color: var(--azul-corporativo);
  margin-bottom: 15px;
  font-weight: 700;
}

.checkmark-list {
  list-style: none;
  margin-top: 15px;
}

.checkmark-list li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 10px;
}

.checkmark-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--amarillo-electrico);
  font-weight: 900;
}

/* 4. FORMULARIO EN AZUL OSCURO CON TEXTO BLANCO Y AMARILLO */
.form-card {
  background: var(--azul-corporativo);
  border-radius: 12px;
  padding: 40px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  border: 2px solid var(--amarillo-electrico);
  border-top: 6px solid var(--amarillo-electrico);
  max-width: 750px;
  margin: 0 auto;
  color: var(--blanco);
}

.form-row {
  display: flex;
  gap: 20px;
}

.form-group {
  flex: 1;
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-weight: 700;
  color: var(--amarillo-electrico);
  margin-bottom: 8px;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
  width: 100%;
  padding: 12px;
  border: 2px solid rgba(255, 204, 0, 0.4);
  background-color: rgba(255, 255, 255, 0.05);
  border-radius: 6px;
  font-size: 1rem;
  color: var(--blanco);
  outline: none;
  transition:
    border-color 0.3s ease,
    background-color 0.3s ease;
}

.form-group input[type="text"]::placeholder,
.form-group input[type="email"]::placeholder,
.form-group textarea::placeholder {
  color: rgba(255, 255, 255, 0.6);
}

.form-group input[type="text"]:focus,
.form-group input[type="email"]:focus,
.form-group textarea:focus {
  border-color: var(--amarillo-electrico);
  background-color: rgba(255, 255, 255, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.checkbox-group label {
  color: var(--blanco);
}

.checkbox-group a {
  color: var(--amarillo-electrico);
  text-decoration: underline;
}

.btn-submit {
  width: 100%;
  padding: 16px;
  background-color: var(--amarillo-electrico);
  color: var(--azul-corporativo);
  border: 2px solid var(--amarillo-electrico);
  border-radius: 8px;
  font-size: 1.1rem;
  font-weight: 900;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
  transition: all 0.3s ease;
  text-transform: uppercase;
}

.btn-submit:hover {
  background-color: transparent;
  color: var(--amarillo-electrico);
}

.alert {
  padding: 15px;
  border-radius: 6px;
  margin-bottom: 20px;
  font-weight: 700;
  text-align: center;
}
.alert.error {
  background-color: rgba(255, 0, 0, 0.2);
  color: #ff9999;
  border: 1px solid #ff4d4d;
}
.alert.exito {
  background-color: rgba(0, 255, 0, 0.2);
  color: #99ff99;
  border: 1px solid #33cc33;
}

@media (max-width: 900px) {
  .card-grid-3,
  .card-grid-2 {
    grid-template-columns: 1fr;
  }
  .hero-section {
    padding: 25px;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .form-row {
    flex-direction: column;
    gap: 0;
  }
}
/* Pie de página */
.footer-simple {
  width: 100%;
  text-align: center;
  padding: 1.5rem 1rem;
  border-top: 1px solid #e2e8f0;
  font-size: 0.75rem;
  color: #94a3b8;
  background-color: #ffffff;
}