/* ==========================================================================
   Site Header
   Always fixed at top. Fully transparent over the hero.
   Glassmorphism effect once scrolled past the hero.
   ========================================================================== */

.site-header {
    position: fixed;
    top: env(safe-area-inset-top, 0px);
    left: 0;
    right: 0;
    z-index: 1000;
    transition: box-shadow 0.5s ease, border-color 0.5s ease;
    border-bottom: 1px solid transparent;
}

/* Glass layer - uses ::before so the gradient can fade via opacity */
.site-header::before {
    content: '';
    position: absolute;
    inset: 0;
    z-index: -1;
    background: linear-gradient(
        135deg,
        rgba(255, 255, 255, 0.72) 0%,
        rgba(231, 238, 245, 0.58) 100%
    );
    -webkit-backdrop-filter: saturate(200%) blur(24px) brightness(1.05);
    backdrop-filter: saturate(200%) blur(24px) brightness(1.05);
    opacity: 0;
    transition: opacity 0.5s ease;
}

/* Sticky state - fade in glass */
.site-header.is-sticky::before {
    opacity: 1;
}

.site-header.is-sticky {
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.5) inset,
        0 4px 24px rgba(35, 39, 71, 0.08);
    border-bottom-color: rgba(35, 39, 71, 0.08);
}

.site-header .container {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding-block: 0.625rem;
}

@media ( min-width: 1024px ) {
    .site-header .container {
        padding-block: 1rem;
    }
}

/* ---- Logo ---- */
.site-header__logo {
    flex-shrink: 0;
    line-height: 0;
    transition: opacity 0.3s ease;
}
.site-header__logo a {
    display: inline-flex;
    align-items: center;
    line-height: 0;
    position: relative;
}

/* Both logos share base styles - stacked via position */
.site-header__logo img {
    height: 72px;
    width: auto;
    display: block;
    transform: scale(1.2);
    transform-origin: left top;
    transition: transform 0.5s cubic-bezier(0.25, 0.1, 0.25, 1),
                opacity 0.5s ease;
}

/* Dark logo sits on top, invisible by default */
.site-header__logo img.site-header__logo-img--dark {
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0;
}
.site-header__logo img.site-header__logo-img--white {
    opacity: 1;
}

/* Sticky: scale down + crossfade logos */
.site-header.is-sticky .site-header__logo img {
    transform: scale(1);
}
.site-header.is-sticky .site-header__logo img.site-header__logo-img--dark {
    opacity: 1;
}
.site-header.is-sticky .site-header__logo img.site-header__logo-img--white {
    opacity: 0;
}

@media ( min-width: 1024px ) {
    .site-header__logo img {
        height: 86px;
        transform: scale(1.2);
    }

    .site-header.is-sticky .site-header__logo img {
        transform: scale(1);
    }
}

/* ---- Navigation ---- */
.site-header__nav {
    display: none;
}

/* Nav-header + close button (used in mobile only, hidden by default) */
.site-header__nav-header,
.site-header__nav-close {
    display: none;
}

.site-header__menu {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
}

/* Default link style - white text (over hero) */
.site-header__menu li a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-white-90);
    text-decoration: none;
    padding-bottom: 0.25rem;
    border-bottom: 2px solid transparent;
    transition: color var(--transition-base), border-color var(--transition-base);
}
.site-header__menu li a:hover,
.site-header__menu li a:focus-visible {
    color: var(--color-white);
    border-color: var(--color-white);
}
.site-header__menu li.current-menu-item > a {
    color: var(--color-white);
    border-color: var(--color-white);
}

/* Sticky link style - navy text on glass */
.site-header.is-sticky .site-header__menu li a {
    color: var(--color-navy);
}
.site-header.is-sticky .site-header__menu li a:hover,
.site-header.is-sticky .site-header__menu li a:focus-visible {
    color: var(--color-blue);
    border-color: var(--color-blue);
}
.site-header.is-sticky .site-header__menu li.current-menu-item > a {
    color: var(--color-blue);
    border-color: var(--color-blue);
}

/* ---- CTA button - hidden below 1024px ---- */
.site-header .site-header__cta {
    display: none;
    flex-shrink: 0;
    margin-left: auto;
    padding: 0.625rem 1.5rem;
    font-size: 0.875rem;
}

/* ---- Hamburger ---- */
.site-header__hamburger {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    margin-left: auto;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-base);
}
.site-header__hamburger:hover {
    background-color: var(--color-white-10);
}

/* Hamburger lines - white by default (over hero) */
.site-header__hamburger-line {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--color-white);
    border-radius: 1px;
    transform-origin: center;
    transition: transform var(--transition-base), opacity var(--transition-base),
        background-color var(--transition-base);
}

/* Navy lines on glass header */
.site-header.is-sticky .site-header__hamburger-line {
    background-color: var(--color-navy);
}

.site-header.is-sticky .site-header__hamburger:hover {
    background-color: var(--color-light-blue);
}

/* Active state - X icon */
.site-header__hamburger.is-active .site-header__hamburger-line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}
.site-header__hamburger.is-active .site-header__hamburger-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
.site-header__hamburger.is-active .site-header__hamburger-line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Hamburger turns navy when menu is open (white panel behind it) */
.site-header__hamburger.is-active .site-header__hamburger-line {
    background-color: var(--color-navy);
}

/* ---- Desktop: show desktop nav + CTA, hide hamburger + mobile nav ---- */
@media ( min-width: 1024px ) {
    .site-header__nav--desktop {
        display: block;
        flex: 1;
    }
    .site-header__nav--mobile {
        display: none;
    }
    .site-header .site-header__cta {
        display: inline-flex;
    }
    .site-header__hamburger {
        display: none;
    }
}

/* ---- Mobile nav ---- */
@media ( max-width: 1023px ) {

    .site-header__nav--desktop {
        display: none;
    }

    /* Nav-header hidden on mobile - logo stays in header row */
    .site-header__nav-header {
        display: none;
    }

    /* Container wraps so nav drops below the logo + hamburger row */
    .site-header .container {
        flex-wrap: wrap;
        row-gap: 0;
    }

    /* Mobile nav takes full width on its own row */
    .site-header__nav--mobile {
        display: block;
        width: 100%;
        order: 10;
        overflow: hidden;
    }

    /* Menu - expands via max-height */
    .site-header__nav .site-header__menu {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        max-height: 0;
        overflow: hidden;
        padding: 0;
        transition: max-height 0.45s cubic-bezier(0.22, 1, 0.36, 1),
                    padding 0.45s cubic-bezier(0.22, 1, 0.36, 1);
    }

    .site-header__nav.is-open .site-header__menu {
        max-height: 500px;
        padding: 0.5rem 0 1rem;
    }

    /* Staggered item reveal */
    .site-header__nav .site-header__menu li {
        opacity: 0;
        transform: translateY(-8px);
        transition: opacity 0.3s ease, transform 0.3s ease;
        border-bottom: 1px solid var(--color-border-light);
    }

    .site-header__nav .site-header__menu li:last-child {
        border-bottom: none;
    }

    .site-header__nav.is-open .site-header__menu li {
        opacity: 1;
        transform: translateY(0);
    }

    .site-header__nav.is-open .site-header__menu li:nth-child(1) { transition-delay: 0.05s; }
    .site-header__nav.is-open .site-header__menu li:nth-child(2) { transition-delay: 0.1s; }
    .site-header__nav.is-open .site-header__menu li:nth-child(3) { transition-delay: 0.15s; }
    .site-header__nav.is-open .site-header__menu li:nth-child(4) { transition-delay: 0.2s; }
    .site-header__nav.is-open .site-header__menu li:nth-child(5) { transition-delay: 0.25s; }
    .site-header__nav.is-open .site-header__menu li:nth-child(6) { transition-delay: 0.3s; }

    .site-header__nav .site-header__menu li a {
        display: block;
        padding: 0.875rem 0;
        font-size: 1rem;
        font-weight: 600;
        letter-spacing: 0.01em;
        color: var(--color-navy);
        border-bottom: none;
        transition: color var(--transition-base), padding-left var(--transition-base);
    }

    .site-header__nav .site-header__menu li a:hover {
        color: var(--color-blue);
        padding-left: 0.5rem;
    }

    .site-header__nav .site-header__menu li.current-menu-item > a {
        color: var(--color-blue);
    }

    /* ---- Menu open state ---- */

    /* Activate glass background */
    .site-header:has(.site-header__nav.is-open)::before {
        opacity: 1;
    }

    /* Crossfade header logo: white → dark (same as sticky) */
    .site-header:has(.site-header__nav.is-open) .site-header__logo img.site-header__logo-img--dark {
        opacity: 1;
    }

    .site-header:has(.site-header__nav.is-open) .site-header__logo img.site-header__logo-img--white {
        opacity: 0;
    }

    /* Scale logo down to normal size when menu is open */
    .site-header:has(.site-header__nav.is-open) .site-header__logo img {
        transform: scale(1);
    }
}