/* ── 4. HEADER ─────────────────────────────────────────────── */
/* Fixed and transparent by default so the hero photo shows (blurred) through
   it on the homepage; becomes solid once scrolled or on inner pages
   (see .is-solid, toggled in assets/js/modules/header.js). #main-content gets top padding to
   compensate — except on the home page, where the hero itself sits at y:0
   underneath the floating header. */
.site-header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 400;
    background: rgba(255,255,255,.28);
    backdrop-filter: saturate(140%) blur(9px);
    -webkit-backdrop-filter: saturate(140%) blur(9px);
    border-bottom: 1px solid transparent;
    transition: background-color var(--dur-base) var(--ease-out), backdrop-filter var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}
.site-header.is-solid {
    background: rgba(255,255,255,.92);
    backdrop-filter: saturate(160%) blur(12px);
    -webkit-backdrop-filter: saturate(160%) blur(12px);
    border-bottom-color: var(--line);
    box-shadow: var(--shadow-sm);
}
.site-header__inner {
    max-width: var(--container);
    margin: 0 auto;
    padding: 1rem clamp(1.25rem, 4vw, 3rem);
    display: flex; align-items: center; justify-content: space-between; gap: 1.5rem;
}

.wordmark { display: flex; flex-direction: column; line-height: 1.1; }
.wordmark__name { font-size: 1.35rem; font-weight: 700; letter-spacing: .01em; color: var(--ink); }
.wordmark__dot { color: var(--blue-600); }
.wordmark__sub { font-size: .68rem; letter-spacing: .05em; text-transform: uppercase; color: var(--ink-faint); margin-top: .25rem; }
.wordmark--footer { display: flex; }

.site-header__right { display: flex; align-items: center; gap: 2.2rem; }

.nav-menu { display: flex; align-items: center; gap: 1.9rem; }
.nav-menu li a {
    position: relative; font-size: .92rem; font-weight: 600; color: var(--ink-2); white-space: nowrap;
    padding: .3rem 0;
}
.nav-menu li a::after {
    content: ""; position: absolute; left: 0; bottom: -3px; width: 100%; height: 2px; border-radius: 2px;
    background: var(--blue-300); transform: scaleX(0); transform-origin: left center;
    transition: transform var(--dur-base) var(--ease-out);
}
.nav-menu li a[aria-current="page"]::after { transform: scaleX(1); background: var(--blue-600); }
@media (hover: hover) and (pointer: fine) {
    .nav-menu li a:hover::after { transform: scaleX(1); }
}
.nav-menu li a[aria-current="page"] { color: var(--blue-700); }

.nav-social svg { width: 19px; height: 19px; color: var(--ink-faint); transition: color var(--dur-fast) var(--ease-out); }
@media (hover: hover) and (pointer: fine) {
    .nav-social:hover svg { color: var(--blue-600); }
}

.nav-hamburger { display: none; flex-direction: column; gap: 5px; padding: .4rem; }
.nav-hamburger span { width: 22px; height: 2px; background: var(--ink); transition: transform var(--dur-base) var(--ease), opacity var(--dur-base) var(--ease); }

.mobile-menu {
    position: fixed; inset: 0; background: var(--paper); z-index: 500;
    display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2.2rem;
    /* Scroll inside the panel on short screens (tablet landscape); and hide it
       completely while closed — otherwise content taller than the screen
       overflows below the translated-away box and peeks in at the top. */
    overflow-y: auto; padding: 4.5rem 1.5rem 2.5rem;
    transform: translateY(-100%); visibility: hidden;
    transition: transform var(--dur-slow) var(--ease-out), visibility 0s linear var(--dur-slow);
}
.mobile-menu.is-open { transform: translateY(0); visibility: visible; transition: transform var(--dur-slow) var(--ease-out), visibility 0s; }
.mobile-menu__close { position: absolute; top: 1.4rem; right: 1.4rem; }
.mobile-menu__list { display: flex; flex-direction: column; gap: 1.6rem; text-align: center; }
.mobile-menu__list a { font-size: 1.5rem; font-weight: 700; }
.mobile-menu__social { display: flex; align-items: center; gap: .5rem; font-weight: 600; color: var(--blue-700); }
.mobile-menu__social svg { width: 20px; height: 20px; }
/* Short screens (tablet/phone landscape): tighter list, scrolls if needed */
@media (max-height: 560px) {
    .mobile-menu { justify-content: flex-start; gap: 1.4rem; }
    .mobile-menu__list { gap: 1rem; }
    .mobile-menu__list a { font-size: 1.25rem; }
}
/* Scroll lock: keep the scrollbar's width as padding (measured in
   ARZ.lockScroll) so the page and the fixed header don't shift sideways */
body.menu-open { overflow: hidden; padding-right: var(--scroll-lock-gap, 0px); }
body.menu-open .site-header { padding-right: var(--scroll-lock-gap, 0px); }