/* ================================ */
/* Site header                      */
/* ================================ */

.site-header {
    position: fixed;
    inset-block-start: 0;
    inset-inline: 0;
    z-index: var(--z-header);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    box-shadow: var(--shadow-sm);
    transition: background var(--transition), box-shadow var(--transition);
}
.site-header[data-shrink="true"] {
    box-shadow: var(--shadow);
}

.site-header__inner {
    display: flex;
    align-items: center;
    gap: var(--space-5);
    height: var(--header-h-default);
    transition: height var(--transition);
}
.site-header[data-shrink="true"] .site-header__inner {
    height: var(--header-h-shrunk);
}

/* ─── Logo (pushed to the visual end) ─── */
.site-logo {
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
    margin-inline-start: auto; /* eats free space → logo goes to end (visual left in RTL) */
    text-decoration: none;
}
.site-logo img {
    height: 56px;
    width: auto;
    transition: height var(--transition);
}
.site-header[data-shrink="true"] .site-logo img { height: 40px; }
.site-logo__text {
    font-size: var(--fs-xl);
    font-weight: var(--fw-bold);
    color: var(--color-primary);
}

/* ─── Primary nav ─── */
.primary-menu {
    display: none;
    list-style: none;
    margin: 0;
    padding: 0;
    align-items: center;
    gap: var(--space-6);
}
.primary-menu > li { position: relative; }

.primary-menu > li > a {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: var(--space-3) var(--space-2);
    color: var(--color-text);
    font-size: var(--fs-base);
    font-weight: var(--fw-medium);
    text-decoration: none;
    position: relative;
    transition: color 200ms ease;
}

/* Animated underline on hover */
.primary-menu > li > a::after {
    content: "";
    position: absolute;
    inset-block-end: var(--space-2);
    inset-inline-start: var(--space-2);
    inset-inline-end: var(--space-2);
    height: 2px;
    background: currentColor;
    transform: scaleX(0);
    transform-origin: var(--underline-origin, center);
    transition: transform 280ms cubic-bezier(0.16, 1, 0.3, 1);
}
.primary-menu > li > a:hover::after,
.primary-menu > li.current-menu-item > a::after,
.primary-menu > li.current-menu-parent > a::after,
.primary-menu > li.current-menu-ancestor > a::after { transform: scaleX(1); }

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

/* Dropdown arrow */
.dropdown-arrow {
    display: inline-block;
    margin-inline-start: 6px;
    font-size: 1em;
    line-height: 1;
    transition: transform 320ms cubic-bezier(0.34, 1.56, 0.64, 1);
}
.has-dropdown:hover > a .dropdown-arrow,
.has-dropdown:focus-within > a .dropdown-arrow,
.has-dropdown.is-open > a .dropdown-arrow {
    transform: rotate(180deg);
}

/* ─── Dropdown submenu (desktop) ─── */
.sub-menu {
    position: absolute;
    inset-block-start: calc(100% + 12px);   /* gap below the header */
    inset-inline-start: 0;                  /* align with the parent button's start edge (RTL: right) */
    min-width: 280px;
    background: #fff;
    list-style: none;
    margin: 0;
    padding: var(--space-3) 0;
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px) scale(0.96);
    transform-origin: top center;
    transition: opacity 240ms cubic-bezier(0.16, 1, 0.3, 1),
                transform 280ms cubic-bezier(0.34, 1.4, 0.5, 1),
                visibility 280ms;
    z-index: var(--z-dropdown);
}
/* Hover-bridge — keeps the dropdown open while moving the cursor from the button to the menu */
.sub-menu::before {
    content: "";
    position: absolute;
    inset-block-end: 100%;
    inset-inline: 0;
    height: 12px;
}
.has-dropdown:hover > .sub-menu,
.has-dropdown:focus-within > .sub-menu,
.has-dropdown.is-open > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.sub-menu li { display: block; }
.sub-menu li a {
    display: block;
    padding: var(--space-3) var(--space-5);
    color: var(--color-text);
    font-weight: var(--fw-medium);
    text-align: start;
    white-space: nowrap;
    text-decoration: none;
    transition: background 180ms ease, color 180ms ease, padding 220ms cubic-bezier(0.16, 1, 0.3, 1);
}
.sub-menu li a:hover,
.sub-menu li.current-menu-item a {
    background: var(--color-bg-alt);
    color: var(--color-primary);
    padding-inline-start: var(--space-6);
}

/* Stagger submenu items on open */
.sub-menu li {
    opacity: 0;
    transform: translateY(-6px);
    transition: opacity 240ms ease, transform 280ms cubic-bezier(0.16, 1, 0.3, 1);
}
.has-dropdown:hover .sub-menu li,
.has-dropdown:focus-within .sub-menu li,
.has-dropdown.is-open .sub-menu li {
    opacity: 1;
    transform: translateY(0);
}
.has-dropdown:hover .sub-menu li:nth-child(1),
.has-dropdown:focus-within .sub-menu li:nth-child(1),
.has-dropdown.is-open .sub-menu li:nth-child(1) { transition-delay: 60ms; }
.has-dropdown:hover .sub-menu li:nth-child(2),
.has-dropdown:focus-within .sub-menu li:nth-child(2),
.has-dropdown.is-open .sub-menu li:nth-child(2) { transition-delay: 110ms; }
.has-dropdown:hover .sub-menu li:nth-child(3),
.has-dropdown:focus-within .sub-menu li:nth-child(3),
.has-dropdown.is-open .sub-menu li:nth-child(3) { transition-delay: 160ms; }
.has-dropdown:hover .sub-menu li:nth-child(4),
.has-dropdown:focus-within .sub-menu li:nth-child(4),
.has-dropdown.is-open .sub-menu li:nth-child(4) { transition-delay: 210ms; }
.has-dropdown:hover .sub-menu li:nth-child(5),
.has-dropdown:focus-within .sub-menu li:nth-child(5),
.has-dropdown.is-open .sub-menu li:nth-child(5) { transition-delay: 260ms; }

/* ─── Social icons ─── */
.site-social {
    display: none;
    align-items: center;
    gap: var(--space-2);
    flex-shrink: 0;
}
.site-social__link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    line-height: 0;
}
.site-social__link img {
    width: 24px;
    height: 24px;
    display: block;
}

/* ─── Mobile toggle (hamburger) ─── */
.nav-toggle {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    gap: 6px;
    background: transparent;
    border: 0;
    border-radius: var(--radius);
    cursor: pointer;
    padding: 0;
    z-index: calc(var(--z-overlay) + 1);
    transition: background var(--transition-fast);
    flex-shrink: 0;
}
.nav-toggle:hover { background: var(--color-bg-alt); }

.nav-toggle__bar {
    width: 26px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transform-origin: center;
    transition: transform 320ms cubic-bezier(0.68, -0.55, 0.27, 1.55),
                opacity 200ms ease,
                background var(--transition-fast),
                width 220ms ease;
}
.nav-toggle:hover .nav-toggle__bar { background: var(--color-primary); }

/* X-shape on open */
.nav-toggle[aria-expanded="true"] .nav-toggle__bar { background: var(--color-primary); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* ─── Mobile menu drawer (1023px and below) ─── */
@media (max-width: 1023px) {

    /* Backdrop dim layer */
    .site-nav::before {
        content: "";
        position: fixed;
        inset: 0;
        inset-block-start: var(--header-h-default);
        background: rgba(15, 20, 40, 0.4);
        opacity: 0;
        visibility: hidden;
        z-index: calc(var(--z-overlay) - 1);
        transition: opacity 320ms ease, visibility 320ms ease;
    }
    .site-nav.is-open::before {
        opacity: 1;
        visibility: visible;
    }

    .primary-menu {
        position: fixed;
        inset-block-start: var(--header-h-default);
        inset-inline: 0;
        background: #fff;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: var(--space-4) var(--container-pad);
        box-shadow: var(--shadow-lg);
        max-height: calc(100vh - var(--header-h-default));
        overflow-y: auto;
        z-index: var(--z-overlay);
        display: flex;

        opacity: 0;
        visibility: hidden;
        transform: translateY(-12px);
        transition: opacity 320ms cubic-bezier(0.16, 1, 0.3, 1),
                    transform 360ms cubic-bezier(0.16, 1, 0.3, 1),
                    visibility 360ms;
    }
    .site-nav.is-open .primary-menu {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .primary-menu > li {
        position: static;
        opacity: 0;
        transform: translateY(-8px);
        transition: opacity 280ms ease, transform 320ms cubic-bezier(0.16, 1, 0.3, 1);
    }
    .site-nav.is-open .primary-menu > li {
        opacity: 1;
        transform: translateY(0);
    }
    .site-nav.is-open .primary-menu > li:nth-child(1) { transition-delay: 100ms; }
    .site-nav.is-open .primary-menu > li:nth-child(2) { transition-delay: 150ms; }
    .site-nav.is-open .primary-menu > li:nth-child(3) { transition-delay: 200ms; }
    .site-nav.is-open .primary-menu > li:nth-child(4) { transition-delay: 250ms; }
    .site-nav.is-open .primary-menu > li:nth-child(5) { transition-delay: 300ms; }
    .site-nav.is-open .primary-menu > li:nth-child(6) { transition-delay: 350ms; }

    .primary-menu > li > a {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: var(--space-4) 0;
        border-block-end: 1px solid var(--color-border);
        font-size: var(--fs-md);
    }
    .primary-menu > li > a::after { display: none; } /* no underline animation on mobile */

    /* Submenu accordion (mobile) */
    .sub-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background: var(--color-bg-alt);
        border-radius: 0;
        padding: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 320ms cubic-bezier(0.16, 1, 0.3, 1),
                    padding 280ms ease;
    }
    .has-dropdown.is-open > .sub-menu {
        max-height: 600px;
        padding-block: var(--space-2);
    }
    .sub-menu li {
        opacity: 1;
        transform: none;
        transition: none;
    }
    .sub-menu li a {
        padding-inline-start: var(--space-8);
        font-size: var(--fs-sm);
    }

    /* Social icons inline at the bottom of the drawer */
    .site-nav.is-open ~ .site-social {
        /* keep it where it is in source order — visible on mobile too if desired */
    }
}

/* ─── Tablet+ (1024px and up) ─── */
@media (min-width: 1024px) {
    .nav-toggle  { display: none; }
    .primary-menu { display: flex; }
    .site-social { display: flex; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    .primary-menu > li > a::after,
    .sub-menu,
    .sub-menu li,
    .primary-menu,
    .primary-menu > li,
    .nav-toggle__bar,
    .dropdown-arrow,
    .site-social a {
        transition: none !important;
        animation: none !important;
    }
}