/* ==========================================================================
   Site Header — Dark / Transparent Museum Aesthetic
   ========================================================================== */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    background-color: transparent;
    height: var(--header-height);
    transition:
        background-color 500ms var(--ease-out-quart),
        box-shadow 500ms var(--ease-out-quart);
}

/* Non-front-page: always dark */
body:not(.home) .site-header {
    background-color: var(--color-primary-dark);
}

.site-header.is-scrolled {
    background-color: var(--color-primary-dark);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* --- Logo / Branding --- */

.site-branding {
    flex-shrink: 0;
}

.site-branding__link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.site-branding__logo {
    height: 65px;
    width: auto;
}

/* --- Primary Navigation --- */

.primary-navigation {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.primary-navigation .nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.primary-navigation .nav-menu > li {
    position: relative;
}

.primary-navigation .nav-menu > li > a {
    display: block;
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-ui);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: rgba(255, 255, 255, 0.8);
    letter-spacing: 0.5px;
    text-transform: uppercase;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}

.primary-navigation .nav-menu > li > a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: var(--space-md);
    right: var(--space-md);
    height: 2px;
    background-color: var(--color-accent);
    transform: scaleX(0);
    transform-origin: right center;
    transition: transform var(--duration-micro) var(--ease-out-quart);
}

.primary-navigation .nav-menu > li > a:hover::before {
    transform: scaleX(1);
    transform-origin: left center;
}

.primary-navigation .nav-menu > li.current-menu-item > a::before,
.primary-navigation .nav-menu > li.current-menu-parent > a::before {
    transform: scaleX(1);
}

.primary-navigation .nav-menu > li > a:hover,
.primary-navigation .nav-menu > li.current-menu-item > a,
.primary-navigation .nav-menu > li.current-menu-parent > a {
    color: var(--color-accent);
}

/* --- Dropdown --- */

.primary-navigation .nav-menu > li > .sub-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 240px;
    background: var(--color-primary);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    padding: var(--space-sm) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px) scale(0.98);
    transition:
        opacity var(--transition-base) var(--ease-out-quart),
        visibility var(--transition-base),
        transform var(--transition-base) var(--ease-out-quart);
    z-index: var(--z-dropdown);
    border: 1px solid rgba(200, 148, 42, 0.15);
}

.primary-navigation .nav-menu > li:hover > .sub-menu,
.primary-navigation .nav-menu > li.menu-item-has-children:focus-within > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.primary-navigation .sub-menu li a {
    display: block;
    padding: var(--space-sm) var(--space-lg);
    font-family: var(--font-ui);
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.7);
    transition: all var(--transition-fast);
}

.primary-navigation .sub-menu li a:hover {
    color: var(--color-accent);
    background-color: rgba(255, 255, 255, 0.05);
}

/* --- Dropdown arrow indicator --- */

.primary-navigation .menu-item-has-children > a::after {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(45deg);
    margin-left: var(--space-sm);
    vertical-align: middle;
    transition: transform var(--transition-fast);
}

.primary-navigation .menu-item-has-children:hover > a::after {
    transform: rotate(-135deg);
}

/* --- Script Toggle (dark variant) --- */

.script-toggle {
    display: flex;
    align-items: center;
    gap: 2px;
    font-family: var(--font-ui);
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
    letter-spacing: 0.5px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    padding: 2px;
}

.script-toggle__link {
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-full);
    color: rgba(255, 255, 255, 0.5);
    transition: all var(--transition-fast);
    background: none;
    border: none;
    font-family: inherit;
    font-size: inherit;
    cursor: pointer;
    line-height: inherit;
}

.script-toggle__link:hover {
    color: rgba(255, 255, 255, 0.9);
}

.script-toggle__link--active {
    background-color: var(--color-accent);
    color: var(--color-text-inverse);
}

.script-toggle__link--active:hover {
    color: var(--color-text-inverse);
}

/* --- Search Toggle (light on dark) --- */

.search-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: transparent;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.search-toggle:hover {
    color: var(--color-accent);
    background-color: rgba(255, 255, 255, 0.1);
}

.search-toggle.is-active {
    color: var(--color-accent);
}

.search-toggle__icon {
    display: block;
}

/* --- Header Search Bar (dark) --- */

.header-search {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--color-primary-dark);
    z-index: calc(var(--z-sticky) + 1);
    display: flex;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transform: translateX(20px);
    transition:
        opacity 250ms var(--ease-out-quart),
        visibility 250ms,
        transform 250ms var(--ease-out-quart);
}

.header-search.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.header-search__form {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.header-search__input {
    flex: 1;
    border: none;
    border-bottom: 2px solid rgba(255, 255, 255, 0.2);
    background: transparent;
    font-family: var(--font-body);
    font-size: var(--text-lg);
    color: var(--color-text-inverse);
    padding: var(--space-sm) 0;
    outline: none;
    transition: border-color var(--transition-fast);
}

.header-search__input::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.header-search__input:focus {
    border-bottom-color: var(--color-accent);
}

.header-search__submit,
.header-search__close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: transparent;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.header-search__submit:hover,
.header-search__close:hover {
    color: var(--color-accent);
    background-color: rgba(255, 255, 255, 0.1);
}

/* --- Mobile Menu Toggle (light bars) --- */

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    padding: 4px;
    cursor: pointer;
    z-index: calc(var(--z-overlay) + 1);
}

.menu-toggle__bar {
    display: block;
    width: 100%;
    height: 2px;
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 2px;
    transition: all var(--transition-base);
    transform-origin: center;
}

.menu-toggle.is-active .menu-toggle__bar:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.is-active .menu-toggle__bar:nth-child(2) {
    opacity: 0;
}

.menu-toggle.is-active .menu-toggle__bar:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Scroll Progress Bar --- */

.scroll-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: transparent;
    z-index: 10;
}

.scroll-progress__bar {
    height: 100%;
    width: 0%;
    background: var(--color-accent);
    transition: none;
}

/* --- Header Actions --- */

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}