/*
  ============================================
  BGF WELDING - LAYOUT (ACTUALIZADO)
  Hero tipo banner + estructura optimizada
  ============================================
*/

/* ========== HERO SECTION - TIPO BANNER ========== */
.hero {
  /* Altura tipo banner - NO 100vh */
  min-height: 70vh !important;
  max-height: 70vh !important;
  height: 70vh !important;
  display: flex;
  align-items: center;
  justify-content: flex-start; /* Alineado a la izquierda */
  position: relative;
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: var(--color-white);
  overflow: hidden;
  padding-top: 80px; /* Espacio para header fijo */
}

.hero-content {
  position: relative;
  z-index: 10;
  text-align: left;
  max-width: 700px;
  margin: 0; /* Sin centrado automático */
  padding: 0 var(--spacing-2xl);
}

/* ========== CONTENEDOR PRINCIPAL ========== */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.container-fluid {
  width: 100%;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* ========== SECCIONES ========== */
section {
  padding: var(--spacing-4xl) 0;
  position: relative;
}

section.section-sm {
  padding: var(--spacing-3xl) 0;
}

section.section-lg {
  padding: var(--spacing-5xl) 0;
}

/* ========== GRID SYSTEM ========== */
.grid {
  display: grid;
  gap: var(--grid-gap);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

.grid-auto-fit {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-auto-fill {
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

/* ========== FLEXBOX UTILITIES ========== */
.flex {
  display: flex;
}

.flex-wrap {
  flex-wrap: wrap;
}

.flex-col {
  flex-direction: column;
}

.flex-row {
  flex-direction: row;
}

.items-start { align-items: flex-start; }
.items-center { align-items: center; }
.items-end { align-items: flex-end; }
.items-stretch { align-items: stretch; }

.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }

.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* ========== HEADER / NAVIGATION ========== */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-index-fixed);
  background-color: var(--color-white);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

header.scrolled {
  box-shadow: var(--shadow-lg);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
  min-height: 80px;
}

/* ========== NAVIGATION ========== */
.nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  list-style: none;
}

.nav-link {
  position: relative;
  padding: var(--spacing-sm) var(--spacing-md);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary-dark);
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: all var(--transition-base);
  transform: translateX(-50%);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-accent);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* ========== FOOTER ========== */
footer {
  background-color: var(--color-primary-dark);
  color: var(--color-white);
  padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  text-align: center;
  font-size: var(--font-size-small);
  opacity: 0.8;
}

/* ========== UTILIDADES DE ESPACIADO ========== */
.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mt-2xl { margin-top: var(--spacing-2xl); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }

.pt-0 { padding-top: 0; }
.pt-sm { padding-top: var(--spacing-sm); }
.pt-md { padding-top: var(--spacing-md); }
.pt-lg { padding-top: var(--spacing-lg); }
.pt-xl { padding-top: var(--spacing-xl); }

.pb-0 { padding-bottom: 0; }
.pb-sm { padding-bottom: var(--spacing-sm); }
.pb-md { padding-bottom: var(--spacing-md); }
.pb-lg { padding-bottom: var(--spacing-lg); }
.pb-xl { padding-bottom: var(--spacing-xl); }

/* ========== UTILIDADES DE TEXTO ========== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--color-primary); }
.text-accent { color: var(--color-accent); }
.text-white { color: var(--color-white); }
.text-gray { color: var(--color-gray); }

/* ========== RESPONSIVE BREAKPOINTS ========== */

/* Tablet (992px) */
@media (max-width: 992px) {
  .hero {
    min-height: 60vh !important;
    max-height: 60vh !important;
    height: 60vh !important;
  }
  
  .container {
    max-width: 720px;
  }
  
  section {
    padding: var(--spacing-3xl) 0;
  }
  
  .grid-cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid-cols-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Mobile Large (768px) */
@media (max-width: 768px) {
  .hero {
    min-height: 60vh !important;
    max-height: 60vh !important;
    height: 60vh !important;
    justify-content: center; /* Centrado en móvil */
  }
  
  .hero-content {
    text-align: center;
    padding: 0 var(--spacing-lg);
  }
  
  .container {
    max-width: 540px;
    padding-left: var(--container-padding-mobile);
    padding-right: var(--container-padding-mobile);
  }
  
  section {
    padding: var(--spacing-2xl) 0;
  }
  
  .grid-cols-4,
  .grid-cols-3,
  .grid-cols-2 {
    grid-template-columns: 1fr;
  }
  
  .grid {
    gap: var(--grid-gap-mobile);
  }
  
  .nav-list {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
}

/* Mobile Medium (576px) */
@media (max-width: 576px) {
  .hero {
    min-height: 55vh !important;
    max-height: 55vh !important;
    height: 55vh !important;
  }
  
  .container {
    max-width: 100%;
  }
  
  section {
    padding: var(--spacing-xl) 0;
  }
}

/* Mobile Small (480px) */
@media (max-width: 480px) {
  .hero {
    min-height: 55vh !important;
    max-height: 55vh !important;
    height: 55vh !important;
  }
  
  :root {
    --font-size-base: 14px;
  }
  
  .header-content {
    min-height: 70px;
  }
}