.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0.9375rem 0; /* 15px */
    transition: padding 0.3s ease;
}

.site-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--colorNo03);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--colorNo04);
    z-index: -1;
}

.header-container {
    max-width: 75.00rem;
    margin: 0 auto;
    padding: 0 1.95rem 0 1.05rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.00rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.9375rem;
    width: auto;
    height: 6.5625rem;
    text-decoration: none;
    transition: height 0.3s ease;
}

.logo img {
    height: 100%;
    width: auto;
}

.logo-text {
    font-family: '-apple-system', 'BlinkMacSystemFont', 'Segoe UI', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-weight: 300;
    font-size: 2.1rem;
    color: var(--colorNo04);
    letter-spacing: 0.0625rem;
    line-height: 1.2;
    text-transform: uppercase;
    display: flex;
    flex-direction: column;
    transition: font-size 0.3s ease;
}

.menu-toggle, .menu-close {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--colorNo04);
    padding: 0.3125rem;
    transition: color 0.3s ease;
}

.menu-toggle:hover, .menu-close:hover {
    color: var(--colorNo07);;
}

.menu-toggle .material-symbols-outlined {
    font-size: 2.5rem;
}

.main-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    gap: 1.875rem;
}

.main-nav a {
    text-decoration: none;
    color: var(--colorNo04); 
    font-family: "IBM Plex Sans", sans-serif;
    font-weight: 500;
    font-size: 1.1rem;
    position: relative;
    transition: all 0.3s ease;
}

.main-nav a::after {
    content: '';
    position: absolute;
    width: 0;    height: 0.0625rem;
    bottom: -0.3125rem;
    left: 0;
    background-color: var(--colorNo07);
    transition: width 0.3s;
}

.main-nav a:hover::after {
    width: 100%;
}

.site-header.scrolled {
    padding: 0.25rem 0;
    box-shadow: 0 2px 10px var(--colorNo08); /* Opcjonalny cień dla lepszego oddzielenia */
}

.site-header.scrolled .logo {
    height: 4.5rem; /* 5rem (nowa wysokość) - 2 * 0.25rem (padding) = 4.5rem */
}

.site-header.scrolled .logo-text {
    font-size: 1.7rem; /* Zmniejszona czcionka */
    flex-direction: row; /* Ułożenie w jednym wierszu */
    gap: 0.5em; /* Odstęp między słowami */
    align-items: center; /* Wyrównanie w pionie */
}