:root {
    --text: #ffffff;
    --muted: #9ca3af;
    --accent: #ffffff; /* white accent for dark backgrounds */
}

/* Ensure that header link does not highlight or change color */
.rml-logo,
.rml-logo a,
.rml-logo a:link,
.rml-logo a:visited,
.rml-logo a:hover,
.rml-logo a:active,
.rml-logo a:focus {
    text-decoration: none;
    color: var(--text);
}

.header a {
    text-decoration: none;
    color: inherit;
}

.rml-logo a {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.lab-logo-img {
    width: 120px;
    height: 120px;
    flex: 0 0 120px; /* do not grow or shrink */
    object-fit: cover;
    display: block;
}

/* Nav moved into header; use a compact horizontal menu */
.nav {
    background: transparent;
    padding: 0;
    border-bottom: none;
    position: static;
    z-index: 100;
}

.nav-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.nav ul {
    list-style: none;
    display: flex;
    gap: 0;
}

.nav a {
    color: var(--muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.75rem 1rem;
    display: block;
    transition: all 0.2s;
    border-bottom: 3px solid transparent;
    border-radius: 6px;
}

.nav a:hover, .nav a.active {
    color: var(--accent);
    background-color: rgba(0,0,0,0.04);
    border-bottom-color: transparent;
}

.header {
        background: #002147;
        color: white;
        padding: 1rem 0;
        box-shadow: 0 2px 20px rgba(0,0,0,0.1);
        position: sticky;
        top: 0;
        z-index: 1000;
    }

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    gap: 2rem;
}

.rml-logo {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.lab-identity {
    text-align: left;
}

.lab-tagline {
    font-size: 1rem;
    opacity: 0.9;
    font-style: italic;
}

.oxford-affiliation {
    font-size: 1.1rem;
    opacity: 0.8;
    font-weight: 300;
    line-height: 1.2;
}

.nav-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.nav li {
    position: relative;
}

@media (max-width: 1210px) {
    .lab-identity {
        display: none;
    }
}

/* adjustments for mobile view */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }

    .rml-logo img {
        display: none;
    }

    .lab-identity {
        display: inline;
        justify-content: center;
    }

    .lab-identity h1,
    .lab-identity p {
        text-align: center;
    }

    .lab-identity h1 {
        font-size: 1.3rem;
    }

    .nav ul {
        justify-content: center;
        flex-wrap: wrap;
    }

    .nav li a {
        font-size: 0.75rem;
        padding: 0.25rem 0.22rem;
    }

    .rml-logo a {
        justify-content: center;
    }
}