/* ==========================================================================
   CSS Reset & Variables
   ========================================================================== */

:root {
  /* Colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f4f5f7;
  --color-text-primary: #1a1a1a;
  --color-text-secondary: #5a5a66;
  --color-accent: #0f2c59; /* Elegant deep blue */
  --color-accent-light: #214e96;
  --color-border: #e5e5ea;
  
  /* Typography */
  --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-size-base: 16px;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  
  /* Layout */
  --container-max-width: 1200px;
  --header-height: 80px;

  /* Transitions */
  --transition-fast: 0.2s ease-in-out;
  --transition-normal: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  line-height: 1.6;
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

h1 {
  font-size: 2.5rem;
}
h2 {
  font-size: 2rem;
}
h3 {
  font-size: 1.5rem;
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-light);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  margin-bottom: var(--spacing-sm);
  padding-left: var(--spacing-md);
  color: var(--color-text-secondary);
}

li {
  margin-bottom: 0.25rem;
}

/* ==========================================================================
   Layout & Container
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

main {
  flex: 1;
  padding-top: calc(var(--header-height) + var(--spacing-md));
}

.section {
  padding: var(--spacing-lg) 0;
}

.section-bg {
  background-color: var(--color-bg-secondary);
}

.text-center {
  text-align: center;
}

.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: background-color var(--transition-fast);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo img {
  height: 40px;
  width: auto;
}

.nav {
  display: none; /* Mobile first: hidden */
}

.nav-list {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--spacing-md);
}

.nav-link {
  font-weight: 500;
  color: var(--color-text-primary);
  padding: var(--spacing-xs) 0;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-fast);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.mobile-menu-btn {
  display: block;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
  z-index: 1001;
}

.mobile-menu-icon {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  position: relative;
  transition: background-color var(--transition-fast);
}

.mobile-menu-icon::before,
.mobile-menu-icon::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-text-primary);
  transition: transform var(--transition-fast);
}

.mobile-menu-icon::before { transform: translateY(-6px); }
.mobile-menu-icon::after { transform: translateY(6px); }

/* Mobile Menu Active State */
.menu-open .nav {
  display: flex;
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  height: calc(100vh - var(--header-height));
  background-color: var(--color-bg-primary);
  flex-direction: column;
  padding: var(--spacing-md);
  animation: fadeIn 0.3s ease-out forwards;
}

.menu-open .nav-list {
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
}

.menu-open .nav-link {
  font-size: 1.5rem;
}

.menu-open .mobile-menu-icon { background-color: transparent; }
.menu-open .mobile-menu-icon::before { transform: rotate(45deg); }
.menu-open .mobile-menu-icon::after { transform: rotate(-45deg); }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  padding: var(--spacing-xl) var(--spacing-md);
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background-color: var(--color-text-primary);
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.6;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero-title {
  color: var(--color-bg-primary);
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
  color: var(--color-bg-secondary);
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
}

.btn {
  display: inline-block;
  padding: 0.8rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  border-radius: 30px;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 2px solid transparent;
}

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

.btn-primary:hover {
  background-color: var(--color-accent-light);
  color: var(--color-bg-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(15, 44, 89, 0.2);
}

/* ==========================================================================
   Cards & Grid (Services / Lines / Nosotros)
   ========================================================================== */

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

.card {
  background-color: var(--color-bg-primary);
  border-radius: 12px;
  padding: var(--spacing-md);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--color-border);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xs);
  color: var(--color-accent);
}

.card-content {
  flex: 1;
}

.card-image-wrapper {
  margin: calc(-1 * var(--spacing-md)) calc(-1 * var(--spacing-md)) var(--spacing-md) calc(-1 * var(--spacing-md));
  border-radius: 12px 12px 0 0;
  overflow: hidden;
}

.card-image-wrapper img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.card:hover .card-image-wrapper img {
  transform: scale(1.05);
}


/* ==========================================================================
   Articles (Líneas de Servicio)
   ========================================================================== */

.service-article {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.service-article:not(:last-child)::after {
  content: '';
  display: block;
  width: 100px;
  height: 2px;
  background-color: var(--color-border);
  margin: var(--spacing-lg) auto 0;
}

.service-content {
  flex: 1;
}

.service-image-slider {
  flex: 1;
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  aspect-ratio: 4/3;
  background-color: var(--color-bg-secondary);
}

.service-image-slider img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 1s ease-in-out;
}

.service-image-slider img.active {
  opacity: 1;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
  background-color: var(--color-text-primary);
  color: var(--color-bg-secondary);
  padding: var(--spacing-lg) 0 var(--spacing-md);
  margin-top: auto;
}

.footer-content {
  text-align: center;
}

.footer p {
  color: #a0a0a0;
  font-size: 0.875rem;
  margin-bottom: 0;
}

/* ==========================================================================
   Animations & Utilities
   ========================================================================== */

.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.fade-in-up.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.lead {
  font-size: 1.25rem;
  font-weight: 300;
  color: var(--color-text-secondary);
}

/* ==========================================================================
   Media Queries (Tablet & Desktop)
   ========================================================================== */

@media (min-width: 768px) {
  h1 { font-size: 3.5rem; }
  h2 { font-size: 2.5rem; }
  
  .hero-title { font-size: 4rem; }
  .hero-subtitle { font-size: 1.5rem; }

  .mobile-menu-btn {
    display: none;
  }
  
  .nav {
    display: block; /* Show menu */
  }

  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .service-article {
    flex-direction: row;
    align-items: center;
  }
  
  /* Alternate layout for service articles */
  .service-article:nth-child(even) {
    flex-direction: row-reverse;
  }
}

@media (min-width: 1024px) {
  .grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}