.site-header {
    position: sticky;
    z-index: 100;
    top: 0;
    width: 100%;
    background: rgb(247 243 234 / 96%);
    border-bottom: 1px solid var(--essayfi-stone);
    box-shadow: 0 8px 28px rgb(32 33 36 / 5%);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    transition: transform 240ms ease, box-shadow 240ms ease;
}

.site-header.is-hidden {
    transform: translateY(calc(-100% - 2px));
    box-shadow: none;
}

.site-header__announcement {
    min-height: 30px;
    display: flex;
    align-items: center;
    background: var(--essayfi-ink);
    color: var(--essayfi-ivory);
    font-size: 0.72rem;
    letter-spacing: 0.025em;
}

.site-header__announcement-inner {
    width: min(1180px, calc(100% - 48px));
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 9px;
}

.site-header__announcement-dot,
.site-footer__open-access-dot {
    width: 7px;
    height: 7px;
    flex: 0 0 7px;
    border-radius: 50%;
    background: var(--essayfi-teal);
}

.site-header__main {
    width: 100%;
}

.site-header__inner {
    width: min(1180px, calc(100% - 48px));
    min-height: 82px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: clamp(20px, 3vw, 48px);
}

.site-header .site-brand {
    width: max-content;
    gap: 9px;
}

.site-header .site-brand img {
    width: 53px;
    height: 53px;
}

.site-header .brand-name {
    font-size: 1.9rem;
}

.site-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: clamp(16px, 2.4vw, 34px);
}

.site-nav__link {
    position: relative;
    padding: 9px 0;
    color: var(--essayfi-ink);
    font-size: 0.91rem;
    font-weight: 600;
    text-decoration: none;
    transition: color 160ms ease;
}

.site-nav__link::after {
    position: absolute;
    right: 0;
    bottom: 2px;
    left: 0;
    height: 2px;
    background: var(--essayfi-teal);
    content: "";
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 160ms ease;
}

.site-nav__link:hover,
.site-nav__link:focus-visible,
.site-nav__link[aria-current="location"] {
    color: var(--essayfi-teal);
}

.site-nav__dropdown {
    position: relative;
}

.site-nav__dropdown > summary {
    display: flex;
    align-items: center;
    gap: 6px;
    list-style: none;
    cursor: pointer;
}

.site-nav__dropdown > summary::-webkit-details-marker {
    display: none;
}

.site-nav__dropdown > summary span {
    font-size: 0.8em;
    transition: transform 160ms ease;
}

.site-nav__dropdown[open] > summary span {
    transform: rotate(180deg);
}

.site-nav__dropdown-menu {
    position: absolute;
    z-index: 110;
    top: calc(100% + 7px);
    left: -15px;
    display: grid;
    width: max-content;
    min-width: 230px;
    max-width: min(320px, calc(100vw - 36px));
    padding: 7px;
    border: 1px solid var(--essayfi-stone);
    border-radius: 10px;
    background: var(--essayfi-ivory);
    box-shadow: 0 16px 32px rgb(32 33 36 / 14%);
}

.site-nav__dropdown-menu a {
    padding: 10px 12px;
    border-radius: 6px;
    color: var(--essayfi-ink);
    font-size: 0.82rem;
    font-weight: 600;
    text-decoration: none;
}

.site-nav__dropdown-menu a:hover,
.site-nav__dropdown-menu a:focus-visible {
    background: rgb(8 127 140 / 8%);
    color: var(--essayfi-teal);
}

.site-nav__link:hover::after,
.site-nav__link:focus-visible::after,
.site-nav__link[aria-current="location"]::after {
    transform: scaleX(1);
}

.site-header__actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.site-header .btn,
.site-nav__mobile-actions .btn {
    min-height: 44px;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    padding: 10px 18px;
    border-radius: 7px;
    font-size: 0.88rem;
    white-space: nowrap;
    cursor: pointer;
}

.site-header .btn-primary {
    box-shadow: 0 5px 14px rgb(8 127 140 / 15%);
}

.site-menu-toggle,
.site-nav__mobile-actions {
    display: none;
}

@media (max-width: 980px) {
    .site-header__inner {
        grid-template-columns: auto minmax(0, 1fr) auto;
        gap: 22px;
    }

    .site-header__actions {
        gap: 10px;
    }

    .site-nav {
        gap: 18px;
    }
}

@media (max-width: 760px) {
    .site-header__announcement-inner,
    .site-header__inner {
        width: calc(100% - 36px);
    }

    .site-header__announcement {
        min-height: 28px;
        font-size: 0.68rem;
    }

    .site-header__inner {
        min-height: 72px;
        grid-template-columns: minmax(0, 1fr) auto auto;
        gap: 14px;
    }

    .site-header .site-brand {
        gap: 6px;
    }

    .site-header .site-brand img {
        width: 43px;
        height: 43px;
    }

    .site-header .brand-name {
        font-size: 1.65rem;
    }

    .site-header__actions .btn {
        min-height: 40px;
        padding: 8px 12px;
        font-size: 0.78rem;
    }

    .site-menu-toggle {
        width: 42px;
        height: 42px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 5px;
        padding: 0;
        border: 1px solid var(--essayfi-stone);
        border-radius: 7px;
        background: var(--essayfi-ivory);
        cursor: pointer;
    }

    .site-menu-toggle__line {
        width: 18px;
        height: 2px;
        border-radius: 2px;
        background: var(--essayfi-ink);
        transition: transform 180ms ease, opacity 180ms ease;
    }

    .site-menu-toggle[aria-expanded="true"] .site-menu-toggle__line:first-child {
        transform: translateY(7px) rotate(45deg);
    }

    .site-menu-toggle[aria-expanded="true"] .site-menu-toggle__line:nth-child(2) {
        opacity: 0;
    }

    .site-menu-toggle[aria-expanded="true"] .site-menu-toggle__line:last-child {
        transform: translateY(-7px) rotate(-45deg);
    }

    .site-nav {
        position: absolute;
        top: 100%;
        right: 0;
        left: 0;
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 8px 18px 18px;
        border-top: 1px solid var(--essayfi-stone);
        border-bottom: 1px solid var(--essayfi-stone);
        background: var(--essayfi-ivory);
        box-shadow: 0 16px 24px rgb(32 33 36 / 10%);
    }

    .site-nav.is-open {
        display: flex;
    }

    .site-nav__link {
        padding: 13px 4px;
        border-bottom: 1px solid var(--essayfi-stone);
    }

    .site-nav__dropdown {
        border-bottom: 1px solid var(--essayfi-stone);
    }

    .site-nav__dropdown > summary {
        border-bottom: 0;
    }

    .site-nav__dropdown-menu {
        position: static;
        width: auto;
        max-width: none;
        padding: 0 0 8px 12px;
        border: 0;
        border-radius: 0;
        background: transparent;
        box-shadow: none;
    }

    .site-nav__dropdown-menu a {
        padding: 10px 8px;
        border-left: 2px solid var(--essayfi-stone);
        border-radius: 0;
        font-size: 0.8rem;
    }

    .site-nav__link::after {
        display: none;
    }

    .site-nav__mobile-actions {
        display: grid;
        padding-top: 14px;
    }

    .site-header__actions .btn {
        display: none;
    }

}

@media (max-width: 390px) {
    .site-header__announcement-inner,
    .site-header__inner {
        width: calc(100% - 28px);
    }

    .site-header__inner {
        gap: 9px;
    }

    .site-header .site-brand img {
        width: 37px;
        height: 37px;
    }

    .site-header .brand-name {
        font-size: 1.5rem;
    }

    .site-header__actions .btn {
        padding-right: 9px;
        padding-left: 9px;
        font-size: 0.72rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .site-header,
    .site-nav__link,
    .site-nav__link::after,
    .site-nav__dropdown > summary span,
    .site-menu-toggle__line {
        transition: none;
    }
}