:root {
    --header-logo-height: 96px;

    --nav-font-size: 0.9rem;
    --nav-letter-spacing: 0.2em;
    --nav-gap: 36px;

    --accent-red: #b00000;
}


*,
*::before,
*::after {
    box-sizing: border-box;
}


.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;

    background: linear-gradient(
        to bottom,
        rgba(0, 0, 0, 0.65),
        rgba(0, 0, 0, 0)
    );

    transition:
        background 0.35s ease,
        backdrop-filter 0.35s ease,
        box-shadow 0.35s ease;
}



.site-header.is-scrolled {
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);

    box-shadow:
        0 8px 30px rgba(0,0,0,0.6),
        0 0 20px rgba(176,0,0,0.15);
}

.site-header.is-scrolled .header-inner {
    padding: 14px 28px;
}


.site-header.is-scrolled .nav-link:hover {
    text-shadow: 0 0 10px rgba(176,0,0,0.6);
}



.header-inner {
    width: 100%;
    padding: 22px 28px;

    display: flex;
    align-items: center;
    justify-content: space-between;

    overflow: hidden;
}


.header-logo {
    flex-shrink: 0;
}

.header-logo img {
    height: var(--header-logo-height);
    width: auto;
    display: block;
}


.header-nav {
    display: flex;
    gap: var(--nav-gap);
    flex-wrap: nowrap;
}


.nav-link {
    color: #ffffff;
    text-decoration: none;

    font-size: var(--nav-font-size);
    letter-spacing: var(--nav-letter-spacing);
    text-transform: uppercase;

    opacity: 0.8;
    white-space: nowrap;

    transition:
        color 0.25s ease,
        opacity 0.25s ease;
}

.nav-link:hover {
    color: var(--accent-red);
    opacity: 1;
}


@media (max-width: 900px) {

    :root {
        --nav-font-size: 0.85rem;
        --nav-gap: 18px;
    }


    .header-logo {
        display: none;
    }


    .site-header {
        background: rgba(0,0,0,0.55);
        backdrop-filter: blur(6px);
    }

    .header-inner {
        justify-content: center;
        padding: 10px 12px;
    }

   
    .header-nav {
        gap: var(--nav-gap);
    }

    .nav-link {
        font-size: var(--nav-font-size);
        letter-spacing: 0.18em;
        padding: 6px 0;
        opacity: 0.95;
    }
}

@media (min-width: 900px) {

    .header-inner {
        justify-content: space-between;
        padding: 22px 28px;
    }

    .header-logo {
        display: block;
    }
}