header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--gris-suave);
    box-shadow: 0 1px 4px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 5%;          
    z-index: 1000;
    gap: 1rem;
    height: 64px;              
    box-sizing: border-box;
}

header .name {
    display: flex;             /* make it a flex container */
    align-items: center;       /* vertically center the images */
    gap: 40px;                
    margin: 0;
}

header .name img {
    margin-top: 2px;
    max-height: 30px; 
    width: auto; 
}

/* ==== NAV ==== */

nav {
  display: flex;
  gap: 20px;
  flex-grow: 1;
  justify-content: flex-end;
  align-items: center;
}

nav a {
  position: relative;
  text-decoration: none;
  color: #333;
  font-weight: 500;
  padding-bottom: 4px; /* espacio para la barrita */
  transition: color 0.3s ease;
}

/* barrita azul */
nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0%;
  height: 2px;
  background-color: var(--azul-principal, #33aaff);
  transition: width 0.3s ease;
}

/* hover y enlace activo */
nav a:hover,
nav a.active {
  color: var(--azul-principal, #33aaff);
}

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

/* RESPONSIVE */

@media (max-width: 900px) {
    nav a { font-size: 0.9rem; }
}

@media (max-width: 640px) {
    nav, .header-logo { 
        display: none; 
    }
    header { 
        justify-content: center; 
    }
    header img.name { 
        max-height: 56px; 
    }
}