.site-header {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;

    width: 100%;
    height: 80px;

    border-bottom: 1px solid transparent;
    background-color: transparent;

    transition:
        background-color 0.3s ease,
        border-color 0.3s ease,
        backdrop-filter 0.3s ease;
}

.site-header.scrolled {
    border-bottom-color: var(--border-color);

    background-color: rgba(4, 20, 29, 0.96);

    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;

    height: 100%;
}

.site-logo {
    display: flex;
    align-items: center;
    gap: 12px;

    color: var(--text-color);

    font-size: 16px;
    font-weight: 650;
}

.site-logo img {
    width: auto;
    height: 52px;
}

.site-navigation {
    display: flex;
    align-items: center;
    gap: 30px;
}

.site-navigation a {
    position: relative;

    color: var(--secondary-text-color);

    font-size: 15px;
    font-weight: 500;

    transition: color 0.3s ease;
}

.site-navigation a:hover {
    color: var(--text-color);
}

.site-navigation a::after {
    content: "";

    position: absolute;
    bottom: -6px;
    left: 0;

    width: 100%;
    height: 1px;

    background-color: var(--accent-color);

    transform: scaleX(0);
    transform-origin: center;

    transition: transform 0.3s ease;
}

.site-navigation a:hover::after {
    transform: scaleX(1);
}

@media (max-width: 768px) {
    .site-header {
        height: 70px;
    }

    .site-logo {
        gap: 8px;
        font-size: 14px;
    }

    .site-logo img {
        height: 44px;
    }

    .site-navigation {
        gap: 16px;
    }

    .site-navigation a {
        font-size: 13px;
    }
}