/* Site header */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    color: var(--color-white);
}

/* Top page: fade background via overlay (opacity always animates) */
.site-header--front {
    background-color: transparent;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0);
    transition: box-shadow 0.7s ease;
}

.site-header--front::before {
    content: '';
    position: absolute;
    inset: 0;
    background-color: var(--color-text);
    opacity: 0;
    transition: opacity 0.7s ease;
    z-index: -1;
    pointer-events: none;
}

.site-header--front.is-scrolled::before {
    opacity: 1;
}

.site-header--front.is-scrolled {
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.12);
}

/* Sub pages: solid background by default */
.site-header--solid {
    background-color: var(--color-text);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.12);
}

@media (prefers-reduced-motion: reduce) {
    .site-header {
        transition: none;
    }
}

body.admin-bar .site-header {
    top: 32px;
}

@media screen and (max-width: 782px) {
    body.admin-bar .site-header {
        top: 46px;
    }
}

.site-header__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px var(--padding-x);
    transition: padding 0.5s cubic-bezier(0.19, 1, 0.22, 1);
}

.site-header.is-scrolled .site-header__inner {
    padding-top: 12px;
    padding-bottom: 12px;
}

.site-logo {
    display: flex;
    align-items: center;
    z-index: 101;
}

.site-logo__link {
    display: block;
}

.site-logo img {
    filter: brightness(0) invert(1);
}

.site-logo__image {
    display: block;
    height: 36px;
    width: auto;
    transition: height 0.5s cubic-bezier(0.19, 1, 0.22, 1);
}

.site-header.is-scrolled .site-logo__image {
    height: 26px;
}

.site-nav__list {
    display: flex;
    align-items: center;
    gap: 32px;
}

.site-nav__list > li {
    position: relative;
}

.site-nav a {
    font-family: var(--font-en);
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-white);
    opacity: 1;
}

.site-nav a:hover {
    opacity: 0.6;
}

.site-nav .sub-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    display: flex;
    flex-direction: column;
    gap: 0;
    min-width: 180px;
    padding: 14px 0 0;
    background-color: transparent;
    border: none;
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transform: translate(-50%, 8px);
    transition: opacity 0.25s ease, visibility 0.25s ease, transform 0.25s ease;
    pointer-events: none;
    z-index: 1;
}

.site-nav .sub-menu::before {
    content: "";
    position: absolute;
    inset: 14px 0 0;
    z-index: -1;
    background-color: var(--color-text);
    border: 1px solid rgba(255, 255, 255, 0.16);
}

.site-nav .menu-item-has-children:hover > .sub-menu,
.site-nav .menu-item-has-children:focus-within > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, 0);
    pointer-events: auto;
}

.site-nav .sub-menu a {
    display: block;
    padding: 8px 18px;
    font-size: 0.8125rem;
    line-height: 1.5;
    white-space: nowrap;
    text-align: left;
}

/* Hamburger toggle (shown on mobile via 99-responsive.css) */
.site-nav-toggle {
    display: none;
    position: relative;
    z-index: 102;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 6px;
    width: 44px;
    height: 44px;
    margin: 0;
    padding: 0;
    border: none;
    background: transparent;
    cursor: pointer;
    color: var(--color-white);
    -webkit-tap-highlight-color: transparent;
}

.site-nav-toggle__bar {
    display: block;
    width: 24px;
    height: 2px;
    background-color: currentColor;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.site-header.is-nav-open .site-nav-toggle__bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.site-header.is-nav-open .site-nav-toggle__bar:nth-child(2) {
    opacity: 0;
}

.site-header.is-nav-open .site-nav-toggle__bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

.site-header--front.is-nav-open::before {
    opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
    .site-nav-toggle__bar {
        transition: none;
    }
}