:root {
  --color-primario: #030e1a;
  --color-secundario: #2c3e50;
  --color-fondo: #f4f4f4;
  --sombra: 0 8px 20px rgba(0, 0, 0, 0.15);
}

body { font-family: Arial, sans-serif; background-color: var(--color-fondo); margin: 0; }

header, footer { background-color: var(--color-primario); color: white; }

a { text-decoration: none; }


main { padding: 20px; }
.img-principal, .construccion2 { width: 100%; height: auto; }
.construccion3 { display: flex; flex-wrap: wrap; gap: 20px; padding-top: 5%; }
.construccion3 > div { flex: 1 1 300px; }
.fotoladrillos { width: 100%; height: auto; display: block; }
@media (min-width: 768px) { .fotoladrillos { padding-right: 2rem; } }
.nosotrostext { text-align: center; padding: 0 15px; }

.sobre-nosotros { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; color: #333; }

.sobre-nosotros h2 { color: var(--color-secundario); font-weight: 700; }

.collage { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; max-width: 1300px; margin: 40px auto; padding: 10px; }

.collage img { width: 100%; aspect-ratio: 1/1; object-fit: cover; border-radius: 6px; box-shadow: var(--sombra); cursor: pointer; transition: transform 0.3s ease; }

.collage img:hover { transform: scale(1.05); }

@media (max-width: 768px) { .collage { grid-template-columns: repeat(2, 1fr); } }

@media (max-width: 480px) { .collage { grid-template-columns: 1fr; } }

.grilla1 { display: grid; grid-template-columns: repeat(4, 1fr); grid-template-areas: "portada1 portada2 principal1 principal1" "horizontal1 horizontal1 principal1 principal1" "principal2 principal2 horizontal2 horizontal2" "principal2 principal2 portada3 portada4"; gap: 12px; max-width: 1200px; margin: 40px auto; padding: 20px; }

.grilla1 > div { background-color: #ddd; overflow: hidden; border-radius: 8px; }


.grilla1 img { width: 100%; height: 100%; object-fit: cover; display: block; }

@media (max-width: 992px) { .grilla1 { grid-template-columns: 1fr 1fr; grid-template-areas: "portada1 portada2" "principal1 principal1" "horizontal1 horizontal1" "principal2 principal2" "horizontal2 horizontal2" "portada3 portada4"; } }

@media (max-width: 768px) { .grilla1 { grid-template-columns: 1fr; grid-template-areas: "portada1" "portada2" "principal1" "horizontal1" "principal2" "horizontal2" "portada3" "portada4"; } }

.row { margin: 60px auto; max-width: 1100px; padding: 0 20px; }

.row .col-md-4 { background-color: #f8f9fa; padding: 30px 15px; border-radius: 10px; box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06); transition: transform 0.3s ease; margin-bottom: 20px; }

.row .col-md-4:hover { transform: translateY(-5px); }


.row h5 { font-size: 1.25rem; color: #333; margin-bottom: 15px; border-bottom: 2px solid #081c74; display: inline-block; padding-bottom: 5px; }

.row a { color: #090f61; text-decoration: none; font-weight: 500; }

.row a:hover { text-decoration: underline; }