/* ==============================
   Header líquido/fijo estilo hielo
============================== */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    height: 70px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 40px;

    /* Fondo estilo hielo */
    background: rgba(139, 193, 211, 0.684); /* azul muy transparente */
    backdrop-filter: blur(5px) saturate(130%);
    border-bottom: 1px solid rgba(173, 216, 230, 0.569);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.05);

    transition: all 0.3s ease;
    z-index: 1000;
}

.header.scrolled {
    background: rgba(173, 216, 230, 0.25); /* un poco más visible al scrollear */
    border-bottom: 1px solid rgba(173, 216, 230, 0.6);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.header .logo img {
    height: 50px;
    padding-top: 15px;
}

.header .logo:hover {
    transform: translateY(-1.5px);
}

.header nav a {
    margin-left: 20px;
    text-decoration: none;
    color: #000000; /* azul hielo para los links */
    font-weight: bold;
    transition: all 0.3s;
}

.header nav a:hover {
    color: #007fa9; /* azul más fuerte al pasar el mouse */
}

.header::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: linear-gradient(135deg, rgba(173,216,230,0.2), rgba(106, 255, 0, 0.05));
    border-radius: inherit;
    pointer-events: none;
    z-index: -1;
}