/**
 * CloudCDN — Unified site navigation (enterprise-grade).
 *
 * Used across every public page: homepage, dashboard, downloads,
 * api-reference, content pages, 404, and all 28 locales.
 *
 * Design goals:
 *   • Consistent layout and styling on every page
 *   • Accessible (WCAG 2.2 AA): keyboard, screen reader, focus-visible,
 *     44×44px touch targets, sufficient contrast, reduced-motion support
 *   • SEO-friendly: semantic <header>/<nav>/<ul>/<li>/<a>, server-rendered,
 *     descriptive link text, no JS required to navigate
 *   • Mobile-first: hamburger menu on narrow viewports with full-width
 *     dropdown, focus trap, escape-to-close
 *   • RTL support via logical properties (inline-start/end)
 *   • Theme-aware via shared theme.css tokens. light-dark() resolves
 *     against the [data-theme] attribute set by theme-boot.js.
 *   • No external framework required — drop-in <link> + <script>
 */

/* Scoped box-sizing reset. Most of our pages set the universal
   `*, *::before, *::after { box-sizing: border-box }` reset themselves,
   but api-reference (and any third-party-heavy page) doesn't —
   without this the nav-cta's min-height was being interpreted as
   content-box and stretching to 56px when 40px was intended. */
.site-nav,
.site-nav *,
.site-nav *::before,
.site-nav *::after {
  box-sizing: border-box;
}

/* Skip link — visually hidden until focused (WCAG 2.4.1) */
.skip-link {
  position: absolute;
  inset-inline-start: -10000px;
  top: 0;
  z-index: 1100;
  background: var(--accent);
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: 0 0 0.5rem 0;
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
}
.skip-link:focus {
  inset-inline-start: 0;
  outline: 2px solid var(--accent-text);
  outline-offset: 2px;
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: color-mix(in oklab, var(--bg) 92%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  width: 100%;
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
}

.site-nav .nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3.75rem;
  gap: 1rem;
  position: relative;
}

/* Brand — logo + wordmark */
.site-nav .nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  flex-shrink: 0;
  min-height: 2.75rem;
  padding-inline-end: 0.25rem;
}
.site-nav .nav-brand:focus-visible {
  outline: 2px solid var(--accent-text);
  outline-offset: 4px;
  border-radius: 0.25rem;
}
.site-nav .nav-brand img {
  height: 28px;
  width: 28px;
  display: block;
}
.site-nav .nav-brand-text {
  color: var(--heading);
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: -0.01em;
}
/* --accent-text has a WCAG-AA passing contrast against both bg tones;
   --accent itself is the brand fill colour and sits just under 4.5:1 on
   our standard backgrounds when used as text. */
.site-nav .nav-brand-text .accent { color: var(--accent-text); }

/* The <nav> element is the middle flex child of .nav-inner. Giving it
   flex:1 lets it occupy all remaining horizontal space between the brand
   and the right-side CTA, and the inner <ul class="nav-center"> centres
   the links inside that space. Net result matches apple.com's
   globalnav-content alignment: brand pinned left, links truly centred
   between brand and right-side actions, CTA pinned right. The previous
   `margin: 0 auto` trick only centred the links roughly because brand
   and CTA have different widths. */
.site-nav nav[aria-label="Main navigation"] {
  flex: 1;
  display: flex;
  justify-content: center;
}

.site-nav .nav-center {
  display: flex;
  align-items: center;
  gap: 0.125rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav .nav-center > li { margin: 0; padding: 0; }
.site-nav .nav-center a {
  display: inline-flex;
  align-items: center;
  color: var(--text-muted);
  font-size: 0.8125rem;
  font-weight: 500;
  text-decoration: none;
  padding: 0.625rem 1rem;
  min-height: 2.75rem;
  min-width: 2.75rem;
  border-radius: 0.5rem;
  transition: color 0.15s, background 0.15s;
}
.site-nav .nav-center a:hover {
  color: var(--heading);
  background: var(--hover-soft);
}
.site-nav .nav-center a:focus-visible {
  outline: 2px solid var(--accent-text);
  outline-offset: 2px;
  color: var(--heading);
}
.site-nav .nav-center a[aria-current="page"] {
  color: var(--heading);
  background: var(--accent-soft);
  box-shadow: inset 0 0 0 1px var(--border);
}

/* Right side — CTA button */
.site-nav .nav-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}
.site-nav .nav-cta {
  /* The brand --accent (#6366f1) hits 4.46:1 against white — just under
     WCAG-AA 4.5:1 for normal text. Use a slightly darker indigo for the
     CTA fill (same hue family, passes contrast). Hover restores the
     brand fill for affordance. */
  background: #4f46e5;
  color: #fff !important;
  border-radius: 6rem;
  padding: 0.5rem 1.125rem;
  font-size: 0.8125rem;
  font-weight: 600;
  text-decoration: none !important;
  transition: background 0.2s, transform 0.1s;
  min-height: 2.5rem;
  display: inline-flex;
  align-items: center;
}
.site-nav .nav-cta:hover {
  background: var(--accent);
}
.site-nav .nav-cta:focus-visible {
  outline: 2px solid var(--accent-text);
  outline-offset: 3px;
}
.site-nav .nav-cta:active { transform: translateY(1px); }

/* Hamburger (mobile only) */
.site-nav .nav-hamburger {
  display: none;
  background: none;
  border: 1px solid var(--border-subtle);
  color: var(--text);
  padding: 0.5rem;
  cursor: pointer;
  margin-inline-start: auto;
  border-radius: 0.5rem;
  width: 2.75rem;
  height: 2.75rem;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, border-color 0.15s;
}
.site-nav .nav-hamburger:hover {
  background: var(--hover-soft);
  border-color: var(--border);
}
.site-nav .nav-hamburger:focus-visible {
  outline: 2px solid var(--accent-text);
  outline-offset: 2px;
}
.site-nav .nav-hamburger svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: currentColor;
  display: block;
}

/* Mobile breakpoint */
@media (max-width: 860px) {
  .site-nav .nav-center,
  .site-nav .nav-right { display: none; }
  .site-nav .nav-hamburger { display: inline-flex; }

  .site-nav.open .nav-center {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    inset-inline: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border-subtle);
    padding: 0.5rem;
    gap: 0.25rem;
    margin: 0;
    box-shadow: var(--shadow-md);
  }
  .site-nav.open .nav-center a {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 0.9375rem;
    border-radius: 0.5rem;
    min-height: 3rem;
  }
  .site-nav.open .nav-right {
    display: flex;
    position: absolute;
    top: calc(100% + 17rem);
    inset-inline: 0;
    background: var(--surface);
    padding: 0 1rem 1rem;
    border-bottom: 1px solid var(--border-subtle);
  }
  .site-nav.open .nav-right .nav-cta {
    width: 100%;
    justify-content: center;
    padding: 0.75rem 1rem;
    font-size: 0.9375rem;
  }
}

/* Reduced motion — disable transitions and animations */
@media (prefers-reduced-motion: reduce) {
  .site-nav *,
  .skip-link {
    transition: none !important;
    animation: none !important;
  }
}

/* High contrast — thicker borders */
@media (prefers-contrast: more) {
  .site-nav {
    border-bottom-color: var(--border);
  }
  .site-nav .nav-center a[aria-current="page"] {
    box-shadow: inset 0 0 0 2px var(--accent-text);
  }
}