body {
	background: linear-gradient(to bottom, #000000, #8b0000);
	
	background-repeat:no-repeat;
	background-size:cover;
	background-attachment:fixed;
	font-family: 'Ubuntu', sans-serif;
}


table.principal {
	background-color:#FFFFFF;
	width:980px;
	margin:auto;
	border-collapse:collapse;
}

h1.construccion {
  text-align: center;
  color: red;
}

.menu-principal {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin: 10px 0;
  flex-wrap: wrap;
}

.menu-boton {
  
  background-color: #8b0000;
  color: white;
  padding: 12px 24px;
  font-size: 16px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.3s;
}

.menu-boton:hover {
  background-color: #aa0000;
  color: white;
}


.logo {
  display: block;
  margin: 0 auto;
  max-height: 100px;      
  padding: 10px 0;
}


.imagen-principal {
  display: block;
  max-width: 400px;
  width: 100%;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
}
.imagen-box{
  
  max-width: 600px;
  width: 100%;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
  align-items: center;
  Padding-bottom: 90px;
}
.presentacion {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 30px;
  margin: 20px 0;
  flex-wrap: wrap;
}
.texto-presentacion {
  max-width: 400px;
  color: #00000;
  font-family: Arial, sans-serif;
}

.texto-presentacion h2 {
  margin-bottom: 10px;
  font-size: 20px;
  color: #ff0000; 
}

.texto-presentacion p {
  margin: 0;
  line-height: 1.5;
}

td.cabecera {
  background-color: #e3010c;         
  color: #000000;                            
  padding: 20px;
  font-size: 24px;
  font-weight: bold;
  text-align: center;

}
td.menu {
	background-color:#808080;
}

td.contenido{
	padding:5px;
}

td.contenido p {
	text-align:justify;
	line-height:1.5;
}

td.contenido h1 {
	color:#003399;
	text-decoration:none;
}

a:link {
	color: #15518f;
	text-decoration:none;
}
a:visited {
	color: #15518f;
	text-decoration:none;
}
a:active {
	color: #15518f;
	text-decoration:none;
}
a.menu-boton {
  color: white ;
}

td.contenido a:hover {
	color:#A4FBEE;
	background-color:#000000;
}

	.imagenes-dos-columnas {
  display: flex;
  justify-content: center;
  gap: 20px; 
  margin-top: 20px;
  flex-wrap: wrap;
}

.imagen-columna {
  width: 400px;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
  margin-bottom: 30px;
}