/* Site header — sticky/fixed, mobile-first, BEM */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background-color: transparent;
    color: var(--color-text);
    transition: background-color 0.25s ease, backdrop-filter 0.25s ease, box-shadow 0.25s ease;
}

.site-header.is-scrolled {
    background-color: rgba(0, 0, 0, 0.88);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
}

.site-header__inner {
    max-width: var(--container-max);
    margin-inline: auto;
    padding: 1.25rem var(--container-padding);
    display: grid;
    grid-template-columns: auto auto;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.site-header__logo {
    display: inline-grid;
    max-width: 8.5rem;
    z-index: 2;
}

.site-header__logo img {
    width: 100%;
    height: auto;
    display: block;
}

.site-header__toggle {
    display: inline-grid;
    gap: 0.3125rem;
    align-content: center;
    justify-items: center;
    width: 2.5rem;
    height: 2.5rem;
    padding: 0.5rem;
    border: 0;
    border-radius: 0.25rem;
    background: transparent;
    color: var(--color-text);
    cursor: pointer;
    z-index: 2;
}

.site-header__toggle-bar {
    display: block;
    width: 1.375rem;
    height: 0.125rem;
    border-radius: 999px;
    background-color: currentColor;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-header.is-open .site-header__toggle-bar:nth-child(2) {
    transform: translateY(0.4375rem) rotate(45deg);
}

.site-header.is-open .site-header__toggle-bar:nth-child(3) {
    opacity: 0;
}

.site-header.is-open .site-header__toggle-bar:nth-child(4) {
    transform: translateY(-0.4375rem) rotate(-45deg);
}

.site-header__nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 1.25rem var(--container-padding) 1.75rem;
    background-color: rgba(0, 0, 0, 0.94);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.site-header.is-open .site-header__nav {
    display: grid;
}

.site-header__menu {
    display: grid;
    gap: 0.25rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.site-header__item,
.site-header__menu > li {
    margin: 0;
}

.site-header__link,
.site-header__menu a {
    display: block;
    padding: 0.625rem 0;
    font-size: 0.9375rem;
    font-weight: 400;
    line-height: 1.4;
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    transition: color 0.2s ease, opacity 0.2s ease;
}

.site-header__link:hover,
.site-header__link:focus-visible,
.site-header__menu a:hover,
.site-header__menu a:focus-visible {
    color: #ffffff;
}

.site-header__cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    justify-self: start;
    min-height: 2.5rem;
    padding: 0.5rem 1.375rem;
    border: 1px solid var(--color-primary);
    border-radius: 3.125rem;
    font-family: var(--font-family);
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.4;
    color: #ffffff;
    background-color: var(--color-primary);
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.site-header__cta:hover,
.site-header__cta:focus-visible {
    background-color: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
}

.site-header__toggle:focus-visible,
.site-header__link:focus-visible,
.site-header__menu a:focus-visible,
.site-header__cta:focus-visible {
    outline: 2px solid #ffffff;
    outline-offset: 2px;
}

/* Desktop */
@media (min-width: 64rem) {
    .site-header__inner {
        grid-template-columns: auto 1fr;
        padding-block: 1.5rem;
        gap: 2rem;
    }

    .site-header__logo {
        max-width: 10.5rem;
    }

    .site-header__toggle {
        display: none;
    }

    .site-header__nav {
        position: static;
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        justify-content: flex-end;
        gap: 1.5rem 2rem;
        padding: 0;
        background: transparent;
        border: 0;
    }

    .site-header__menu {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        justify-content: flex-end;
        gap: 0.25rem 2rem;
    }

    .site-header__link,
    .site-header__menu a {
        padding: 0.25rem 0;
        font-size: 0.9375rem;
    }

    .site-header__cta {
        justify-self: auto;
        flex-shrink: 0;
        min-height: 2.625rem;
        padding: 0.5625rem 1.5rem;
        font-size: 0.9375rem;
    }
}