/* site-header.css — the sticky nav header plus the page shell it sits in.
 * Shared by every page that uses the site header (index.html, contact/).
 * Moved verbatim out of landing.css; load it after components.css and
 * before the page's own stylesheet. */

/* ── Page shell ─────────────────────────────────────────────── */
html { scroll-behavior: smooth; }
/* In-page nav links (e.g. #admin-work) jump instantly for people who've
   turned motion off. */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* Fill the viewport so the footer sits at the bottom on short pages. The
   sticky header sits at the top of the flow; `main`'s auto bottom margin
   pushes the footer down when the content doesn't fill the screen. */
body {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}
main { margin-bottom: auto; }

/* ── Header ─────────────────────────────────────────────────── */
/* Sticky 72px nav bar, written mobile-first.
   Below 1024px: hamburger + logo on the left, small login on the right, and the
   nav becomes a panel that slides down from under the bar (opened/closed by
   js/site-header.js, which toggles .site-header--open).
   From 1024px up: the logo and login containers share the same fixed width so
   the nav menu between them stays optically centered on the page. */
.site-header {
  --site-header-height: 72px;
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  height: var(--site-header-height);
  background: var(--color-surface);
  box-shadow: inset 0 -1px 0 var(--color-border-subtle); /* inner bottom border */
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding-inline: var(--space-24);
}

/* Brand (hamburger + logo) ----------------------------------- */
.site-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-16);
}
.site-header__toggle {
  display: inline-flex;
  /* Off-scale by design: derived, not chosen. 11px is (44-22)/2 — the inset
     that grows a 22px icon to a 44px touch target. The negative margin keeps
     the layout (and the 16px gap to the logo) measured from the icon itself. */
  padding: 11px;
  margin: -11px;
  border: 0;
  border-radius: var(--radius-field);
  background: none;
  color: var(--color-text-secondary);
  cursor: pointer;
}
.site-header__toggle:focus-visible {
  outline: 2px solid var(--color-brand-primary);
  outline-offset: -2px;
}
.site-header__toggle-icon { display: block; width: 22px; height: 22px; }
.site-header__toggle-icon--close,
.site-header--open .site-header__toggle-icon--open { display: none; }
.site-header--open .site-header__toggle-icon--close { display: block; }

/* Logo ------------------------------------------------------- */
.wordmark {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  text-decoration: none;
  color: var(--color-text-primary);
}
.wordmark__mark { display: inline-flex; }
.wordmark__mark img { width: 28px; height: 28px; }
.wordmark__text {
  font: var(--font-title-large);
  font-weight: 400; /* "Service" regular; the token's own 600 is overridden here */
}
.wordmark__sheep { font-weight: 600; }

/* Nav menu (mobile: slide-down panel) ------------------------ */
/* The wrapper sits just under the bar and clips the list, so the list slides
   down from behind the bar's bottom edge. Visibility flips only after the
   slide-up finishes, so closed links can't be reached with Tab. */
.site-nav {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: var(--z-raised);
  overflow: hidden;
  visibility: hidden;
  transition: visibility 0s linear 250ms;
}
.site-header--open .site-nav {
  visibility: visible;
  transition-delay: 0s;
}
.site-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--color-surface);
  transform: translateY(-100%);
  transition: transform 250ms ease-out;
}
.site-header--open .site-nav__list { transform: translateY(0); }
.site-nav__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-16);
  padding: var(--space-16) var(--space-24);
  font: var(--font-title-medium);
  color: var(--color-text-primary);
  text-decoration: none;
  box-shadow: inset 0 -1px 0 var(--color-border-subtle); /* inner bottom border keeps rows 56px */
}
.site-nav__link:focus-visible {
  outline: 2px solid var(--color-brand-primary);
  outline-offset: -2px;
}
.site-nav__caret {
  flex: none;
  width: 16px;
  height: 16px;
  color: var(--color-border-strong);
}

/* Dims the page under the open menu; tapping it closes the menu. */
.site-header__scrim {
  position: fixed;
  inset: var(--site-header-height) 0 0 0;
  z-index: var(--z-base);
  background: color-mix(in srgb, var(--color-text-primary) 40%, transparent); /* Neutral/900 at 40% */
  opacity: 0;
  visibility: hidden;
  transition: opacity 250ms ease-out, visibility 0s linear 250ms;
}
.site-header--open .site-header__scrim {
  opacity: 1;
  visibility: visible;
  transition-delay: 0s;
}
/* Stop the page behind the overlay from scrolling while the menu is open. */
.has-site-menu-open { overflow: hidden; }

@media (prefers-reduced-motion: reduce) {
  .site-nav,
  .site-nav__list,
  .site-header__scrim { transition: none; }
}

/* Login ------------------------------------------------------ */
.site-header__login {
  display: flex;
  justify-content: flex-end;
}
/* Each layout gets its own action: Contact in the mobile bar (Log In moves
   into the menu), Log In on desktop (Contact sits in the nav row). */
ui-button.site-header__login-button,
.site-nav__item--desktop { display: none; }

/* Desktop (1024px and up) ------------------------------------ */
@media (min-width: 1024px) {
  .site-header { box-shadow: none; }
  .site-header__inner {
    justify-content: flex-start;
    padding-inline: var(--space-24);
  }
  .site-header__brand { flex: 0 0 191px; }
  .site-header__toggle,
  .site-header__scrim { display: none; }
  /* Never lock page scroll on desktop, even if the menu was left open. */
  .has-site-menu-open { overflow: visible; }
  .wordmark { gap: var(--space-12); }
  .wordmark__mark img { width: 32px; height: 32px; }

  .site-nav {
    position: static;
    flex: 1 1 auto;
    overflow: visible;
    visibility: visible;
    transition: none;
  }
  .site-nav__list {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-24);
    background: none;
    transform: none;
    transition: none;
  }
  .site-nav__link {
    display: block;
    padding: var(--space-12);
    font: var(--font-body-large);
    color: var(--color-text-secondary);
    text-align: center;
    border-radius: var(--radius-field);
    box-shadow: none;
  }
  .site-nav__link:hover { color: var(--color-text-primary); }
  .site-nav__link:focus-visible { outline-offset: 2px; }
  .site-nav__caret { display: none; }

  .site-header__login { flex: 0 0 191px; }
  ui-button.site-header__contact,
  .site-nav__item--mobile { display: none; }
  ui-button.site-header__login-button { display: inline; }
  .site-nav__item--desktop { display: list-item; }
}

/* Applied once nav functionality lands. Kept after the desktop block so it
   wins over both layouts' default link colour. */
.site-nav__link--active { color: var(--color-brand-primary); }