/* Shared adaptive navigation. The header borrows the surface beneath it so it
   reads as part of the page, while the menu remains one consistent system. */
.site-header {
  --header-surface: var(--pure-white);
  --header-ink: var(--color-ink);
  position: fixed;
  inset: 0 0 auto;
  z-index: var(--z-nav);
  min-height: var(--nav-h);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(var(--s-8), 4vw, var(--s-16));
  padding: 0 var(--gutter);
  border: 0;
  background: var(--header-surface);
  color: var(--header-ink);
  transition: background-color var(--d-1) linear, color var(--d-1) linear;
}

.site-header[data-tone="dark"] { --header-ink: var(--pure-white); }
.site-header__brand { width: clamp(118px, 9vw, 148px); line-height: 0; }
.site-header__brand img { width: 100%; height: auto; transition: filter var(--d-1) linear; }
.site-header[data-tone="dark"] .site-header__brand img { filter: brightness(0) invert(1); }
.site-header__nav { justify-self: end; display: flex; align-items: center; gap: clamp(var(--s-5), 2.2vw, var(--s-10)); }
.site-header__nav > a,
.site-header__actions > a { color: inherit; font-size: var(--t-label); font-weight: 560; letter-spacing: .01em; text-decoration: none; }
.site-header__nav > a:hover,
.site-header__actions > a:not(.header-cta):hover { opacity: .58; }

.site-header__actions { justify-self: end; display: flex; align-items: center; gap: var(--s-5); }
.header-cta { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; padding: 0 var(--s-6); border-radius: var(--r-pill); background: var(--color-ink); color: var(--pure-white) !important; }
.site-header[data-tone="dark"] .header-cta { background: var(--pure-white); color: var(--header-surface) !important; }
.header-cta:hover { transform: translateY(-1px); }
.header-cta--download { gap: .5em; }
.header-cta--download .apple-mark { flex: 0 0 auto; margin-block-start: -.12em; }
.menu-button { display: none; width: 48px; height: 48px; padding: 0; border: 1px solid currentColor; border-radius: 50%; background: transparent; color: inherit; cursor: pointer; }
.menu-button span { display: block; width: 21px; height: 1px; margin: 5px auto; background: currentColor; }

.mobile-nav[hidden] { display: none; }
.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-nav) + 40);
  min-height: 100dvh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  padding: max(var(--s-5), env(safe-area-inset-top)) var(--gutter) max(var(--s-6), env(safe-area-inset-bottom));
  overflow-y: auto;
  background: var(--color-accent);
  color: var(--pure-white);
  isolation: isolate;
}
.mobile-nav::before { content: ""; position: absolute; z-index: -1; width: min(76vw, 560px); aspect-ratio: 1; right: -25vw; top: 16%; border: 1px solid var(--overlay-white-25); border-radius: 50%; pointer-events: none; }
.mobile-nav::after { content: ""; position: absolute; z-index: -1; inset: 0 auto 0 72%; width: 1px; background: var(--overlay-white-18); pointer-events: none; }
.mobile-nav__top { min-height: 58px; display: flex; align-items: start; justify-content: space-between; gap: var(--s-6); }
.mobile-nav__brand { width: 132px; padding-top: var(--s-3); line-height: 0; }
.mobile-nav__brand img { width: 100%; height: auto; }
.mobile-nav__close { width: 52px; height: 52px; display: grid; flex: 0 0 auto; place-items: center; padding: 0; border: 1px solid var(--overlay-white-48); border-radius: 50%; background: transparent; color: inherit; cursor: pointer; }
.mobile-nav__close span { grid-area: 1 / 1; width: 20px; height: 1px; background: currentColor; }
.mobile-nav__close span:first-child { transform: rotate(45deg); }
.mobile-nav__close span:last-child { transform: rotate(-45deg); }
.mobile-nav__links { align-self: center; padding: var(--s-10) 0; }
.mobile-nav__direct { border-bottom: 1px solid var(--overlay-white-25); }
.mobile-nav__direct:first-child { border-top: 1px solid var(--overlay-white-25); }
.mobile-nav__direct { display: grid; grid-template-columns: 44px minmax(0, 1fr) auto; align-items: center; gap: var(--s-3); padding: clamp(var(--s-4), 2.4vh, var(--s-6)) 0; color: inherit; font-size: clamp(2rem, 7.6vw, 4.1rem); font-weight: 500; letter-spacing: -.055em; line-height: .95; list-style: none; cursor: pointer; text-decoration: none; }
.mobile-nav__index { align-self: start; padding-top: .3em; color: var(--color-blue-soft); font-family: var(--font-editorial); font-size: .28em; font-style: italic; letter-spacing: 0; }
.mobile-nav__foot { display: flex; align-items: end; justify-content: space-between; gap: var(--s-6); padding-top: var(--s-6); }
.mobile-nav__foot > p { max-width: 10ch; font-size: clamp(1.35rem, 4.8vw, 2.4rem); font-weight: 500; letter-spacing: -.045em; line-height: .95; }
.mobile-nav__foot em { color: var(--color-blue-soft); }
.mobile-nav__cta { flex: 0 0 auto; min-height: 46px; display: inline-flex; align-items: center; gap: var(--s-3); padding: 0 var(--s-6); border-radius: var(--r-pill); background: var(--pure-white); color: var(--color-accent); font-size: .82rem; font-weight: 620; text-decoration: none; }
body.menu-open { overflow: hidden; }

@media (max-width: 1120px) {
  .site-header { grid-template-columns: auto 1fr; }
  .site-header__nav,
  .site-header__actions > a { display: none; }
  .menu-button { display: block; }
}

@media (max-width: 680px) {
  .site-header { padding-inline: var(--s-5); }
  .site-header__brand { width: 122px; }
  .menu-button { width: 46px; height: 46px; }
  .mobile-nav { padding-inline: var(--s-5); }
  .mobile-nav__foot > p { display: none; }
  .mobile-nav__foot { justify-content: stretch; }
  .mobile-nav__cta { width: 100%; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  .site-header, .site-header__brand img { transition: none; }
}