:root {
  --primary: #5b9bdc; /* 92c4f7 */
  --primary-dark: #6aa9e6; /*6aa9e6*/
  --secondary: #0a0a0a; /* Fondo oscuro */
  --accent: #e67e22;
  --light: #f9f9f9;
  --dark: #1a1a1a;
  --gray: #7f8c8d;
  --light-gray: #e6e6e6;
  --dark2: rgba(10, 10, 10);

  --iconColor1:#bdbdbd;
  --iconColor2:#898989;

  --heading-font: "Montserrat", sans-serif;
  --body-font: "Poppins", sans-serif;

  --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 20px 25px rgba(0, 0, 0, 0.1);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  --transition: all 0.2s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--body-font);
  line-height: 1.6;
  color: var(--light);
  background-color: var(--secondary);
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 6rem 0;
}

.section-title {
  font-family: var(--heading-font);

  text-align: center;
  margin-bottom: 3rem;
  position: relative;
  color: var(--light);
}

.section-title h2 {
  font-size: 2.5rem;
  font-weight: 700;
}

.section-title h3 {
  font-size: 1.5rem;
  font-weight: 400;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: var(--primary);
  border-radius: var(--radius-full);
}

.btn {
  display: inline-block;
  padding: 0.8rem 2rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--secondary);
}

.btn-primary:hover {
  background-color: var(--primary-dark);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: #2e4e6d;
  border: 2px solid #2e4e6d;
  color: var(--secondary);
}

.btn-secondary:hover {
  background-color: var(--primary);
  color: var(--secondary);
}

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}

.btn-outline:hover {
  background-color: var(--primary);
  color: var(--secondary);
}

.header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(10, 10, 10, 0.95);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.header.scrolled {
  background-color: var(--secondary);
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.2rem 0;
}

.logo {
  font-family: var(--heading-font);
  font-size: 1rem;
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  letter-spacing: 1px;
}

.logo span {
  color: var(--light);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 1rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--light);
  font-weight: 500;
  transition: var(--transition);
  position: relative;
  font-size: 1rem;
}

.nav-links a:hover {
  color: var(--primary);
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary);
  transition: var(--transition);
}

.nav-links a:hover::after {
  width: 100%;
}

.hamburger {
  display: none;
  cursor: pointer;
  color: var(--light);
}

.hero {
  display: flex;
  align-items: center;
  background: linear-gradient(rgba(10, 10, 10, 0.7), rgba(10, 10, 10, 0.7)),
    url("https://images.unsplash.com/photo-1575971637203-d6255d9947a9?q=80&w=1074&auto=format&fit=crop&ixlib=rb-4.1.0&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D")
      center/cover fixed;
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  padding-top: 4rem;
  padding-bottom: 2rem;
}

.slogan {
  font-size: 1.1rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 1rem;
  font-weight: 500;
}

.hero-title {
  font-family: var(--heading-font);
  font-size: 3.8rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  color: var(--light);
}

.hero-title span {
  color: var(--accent);
  display: block;
}

.hero-subtitle {
  font-size: 1.3rem;
  color: var(--light-gray);
  margin-bottom: 2.5rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-highlight {
  background: rgba(26, 26, 26, 0.7);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  border-top: 4px solid var(--accent);
  margin: 2.5rem 0;
  text-align: left;
}

.hero-highlight p {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: var(--light);
}

.hero-highlight p:last-child {
  margin-bottom: 0;
}

.hero-buttons {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  margin-top: 2rem;
}

.services {
  background: linear-gradient(rgba(10, 10, 10, 0.5), rgba(10, 10, 10, 0.5)),
    url("https://images.unsplash.com/photo-1639953803381-e9c3f3a38253?q=80&w=1170&auto=format&fit=crop&ixlib=rb-4.1.0&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D")
      center/cover fixed;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2.5rem;
  margin-top: 3rem;
}

.service-card {
  background: rgba(26, 26, 26, 0.8);
  border-radius: var(--radius-md);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  text-align: center;
  border-top: 4px solid var(--accent);
  position: relative;
  overflow: hidden;
}

.service-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
}

.service-icon {
  font-size: 3.5rem;
  color: var(--iconColor1);
  margin-bottom: 1.5rem;
  transition: var(--transition);
}

.service-card:hover .service-icon {
  transform: scale(1.1);
}

.service-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.2rem;
  color: var(--light);
}

.why-us {
  background: linear-gradient(rgba(10, 10, 10, 0.5), rgba(10, 10, 10, 0.5)),
    url("https://images.unsplash.com/photo-1581093458797-5d2e4b23f0b2?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1470&q=80")
      center/cover fixed;
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.benefit-card {
  background: rgba(26, 26, 26, 0.7);
  border-radius: var(--radius-md);
  padding: 2rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: var(--transition);
  backdrop-filter: blur(5px);
}

.benefit-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
}

.benefit-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.2rem;
}

.benefit-icon {
  width: 50px;
  height: 50px;
  background: var(--primary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--secondary);
  font-size: 1.5rem;
  flex-shrink: 0;
}

.benefit-title {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--light);
}

.benefit-text {
  color: var(--light-gray);
  padding-left: 0.5rem;
}

.projects {
  background-color: var(--dark);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.8rem;
  margin-top: 3rem;
}

.project-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
  height: 350px;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
}

.project-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.project-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(10, 10, 10, 0.9), transparent);
  padding: 1.8rem;
  color: white;
  transition: var(--transition);
}

.project-title {
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
  color: var(--light);
}

.project-type {
  color: var(--primary);
  font-weight: 500;
}

.about {
  background: linear-gradient(rgba(10, 10, 10, 0.7), rgba(10, 10, 10, 0.7)),
    url("https://images.unsplash.com/photo-1519501025264-65ba15a82390?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1364&q=80")
      center/cover fixed;
}

.about-content {
  display: flex;
  align-items: center;
  gap: 4rem;
}

.about-text {
  flex: 1;
}

.about-title {
  font-family: var(--heading-font);
  font-size: 2.3rem;
  font-weight: 700;
  margin-bottom: 1.8rem;
  color: var(--light);
}

.about-description {
  color: var(--light-gray);
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.stat-item {
  text-align: center;
  background: rgba(26, 26, 26, 0.7);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  backdrop-filter: blur(5px);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.stat-text {
  font-size: 0.95rem;
  color: var(--light-gray);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.about-image {
  flex: 1;
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about-image img {
  width: 100%;
  display: block;
  transition: var(--transition);
}


.social-media {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.social-link {
  width: 45px;
  height: 45px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  transition: var(--transition);
  font-size: 1.2rem;
}

.social-link:hover {
  background: var(--primary);
  color: var(--secondary);
  transform: translateY(-5px);
}



.form-group {
  margin-bottom: 1.8rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.6rem;
  font-weight: 500;
  color: var(--light);
}

.form-control {
  width: 100%;
  padding: 0.9rem 1.2rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  font-family: var(--body-font);
  font-size: 1rem;
  transition: var(--transition);
  background: rgba(10, 10, 10, 0.5);
  color: var(--light);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(146, 196, 247, 0.2);
}

textarea.form-control {
  min-height: 160px;
  resize: vertical;
}

.footer {
  background-color: var(--secondary);
  padding: 4rem 0 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-col h3 {
  font-size: 1.4rem;
  margin-bottom: 1.5rem;
  position: relative;
  padding-bottom: 0.8rem;
  color: var(--light);
}

.footer-col h3::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50px;
  height: 3px;
  background: var(--primary);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.8rem;
}

.footer-links a {
  color: var(--light-gray);
  text-decoration: none;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-links a:hover {
  color: var(--primary);
  padding-left: 5px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 2rem;
  text-align: center;
  color: var(--light-gray);
  font-size: 0.9rem;
}

@keyframes float {
  0% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-15px);
  }
  100% {
    transform: translateY(0px);
  }
}

@media (max-width: 992px) {
  .hero-content {
    text-align: center;
  }

  .hero-title {
    font-size: 3rem;
  }

  .about-content {
    flex-direction: column;
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 50px;
    gap: 4rem;
    right: -100%;
    height: 100vh;
    flex-direction: column;
    background: var(--secondary);
    width: 100%;
    text-align: center;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
  }

  .nav-links.active {
    right: 0;
  }

  .hamburger {
    display: block;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 576px) {
  .section {
    padding: 4rem 0;
  }


  .section-title {
    font-size: 2rem;
  }
}

/* Steel vs Tradicional Section */
.steel-vs-tradicional {
  background-color: var(--dark);
  padding: 6rem 0;
}

.section-subtitle {
  text-align: center;
  color: var(--light-gray);
  max-width: 700px;
  margin: 0 auto 3rem;
  font-size: 1.1rem;
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr); /* por defecto 2 columnas */
  gap: 2rem;
  margin-bottom: 3rem;
}

@media (max-width: 700px) {
  .comparison-grid {
    grid-template-columns: 1fr; /* en mobile, una sola columna */
  }
}

.comparison-card {
  background: rgba(26, 26, 26, 0.7);
  border-radius: var(--radius-md);
  padding: 2rem 1rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: var(--transition);
}

.comparison-card:hover {
  transform: translateY(-10px);
  border-color: var(--primary);
}

.comparison-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.comparison-header i {
  font-size: 2.5rem;
  color: var(--iconColor1);
}

.comparison-header h3 {
  font-size: 1.8rem;
  color: var(--light);
}

.comparison-features {
  list-style: none;
}

.comparison-features li {
  margin-bottom: 1.2rem;
  display: flex;
  gap: 0.8rem;
  color: var(--light-gray);
}

.comparison-features li i {
  color: var(--accent);
  margin-top: 5px;
  flex-shrink: 0;
}

.comparison-cta {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
  background: rgba(146, 196, 247, 0.1);
  padding: 2rem;
  border-radius: var(--radius-md);
  border-top: 4px solid var(--accent);
}

.comparison-cta p {
  margin-bottom: 1.5rem;
  font-size: 1.2rem;
  color: var(--light);
}

/* Process Section */
.process {
  background-color: var(--secondary);
  padding: 6rem 0;
}

.process-tabs {
  background: rgba(26, 26, 26, 0.7);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  max-width: 1000px;
  margin: 0 auto;
}

.tab-buttons {
  display: flex;
  background: rgba(10, 10, 10, 0.5);
}

.tab-btn {
  flex: 1;
  padding: 1.3rem;
  background: none;
  border: none;
  font-family: var(--heading-font);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--light-gray);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.tab-btn.active {
  color: var(--primary);
  background: rgba(26, 26, 26, 0.9);
}

.tab-btn::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--primary);
  transition: var(--transition);
}

.tab-btn.active::after {
  width: 100%;
}

.tab-content {
  display: none;
  padding: 2.5rem;
}

.tab-content.active {
  display: block;
}

.process-steps {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  position: relative;
}

.process-steps::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 30px;
  width: 3px;
  background: rgba(255, 255, 255, 0.1);
  z-index: 1;
}

.process-step {
  display: flex;
  gap: 1.8rem;
  align-items: flex-start;
  position: relative;
  z-index: 2;
}

.step-number {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--secondary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.step-content {
  background: rgba(10, 10, 10, 0.5);
  padding: 1.8rem;
  border-radius: var(--radius-md);
  flex: 1;
  border-left: 3px solid var(--primary);
}

.step-content h3 {
  color: var(--light);
  margin-bottom: 0.8rem;
  font-size: 1.3rem;
}

.step-content p {
  color: var(--light-gray);
}

@media (max-width: 768px) {
  .tab-buttons {
    flex-direction: column;
  }

  .process-steps::before {
    left: 25px;
  }

  .step-number {
    width: 50px;
    height: 50px;
    font-size: 1.2rem;
  }
}

@media (max-width: 576px) {
    .container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 0.5rem;
  }
  .tab-content {
    padding: 1.5rem;
  }

  .process-step {
    flex-direction: column;
    align-items: flex-start;
  }

  .step-content {
    margin-left: 0;
    width: 100%;
  }

  .process-steps::before {
    display: none;
  }
}