/* ===== Shared site navigation =====
   One nav for the whole site. Used by every page (landing, SEO, blog, about,
   legal). Relies on the brand color tokens (--gold, --ink, --line, etc.) that
   each page defines in its own :root.

   Two variants:
     .site-nav            default: solid, sticky bar (blog, about, legal)
     .site-nav--overlay   fixed + transparent over a hero, darkens on scroll
                          (landing pages: index.html, seo.html) */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.5rem;
  background: rgba(11, 11, 12, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}

.site-nav--overlay {
  position: fixed;
  left: 0;
  right: 0;
  height: 72px;
  padding: 0 2.25rem;
  background: transparent;
  border-bottom-color: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  transition: background 0.3s ease, box-shadow 0.3s ease;
}
.site-nav--overlay.is-scrolled {
  background: rgba(4, 7, 15, 0.85);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 1px 0 var(--line);
}

.site-nav__logo { display: inline-flex; align-items: center; text-decoration: none; }
.site-nav__logo img { height: 2.6rem; width: auto; display: block; }
.site-nav--overlay .site-nav__logo img { height: 3rem; }

.site-nav__menu { display: flex; align-items: center; gap: 1.6rem; }
.site-nav__link {
  color: var(--mut-strong);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.1px;
  transition: color 0.15s;
}
.site-nav__link:hover { color: var(--ink); }
.site-nav__link[aria-current="page"] { color: var(--gold); }

.site-nav__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--gold);
  color: var(--on-gold);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.55rem 1.2rem;
  border-radius: 10px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
}
.site-nav__cta:hover { filter: brightness(1.07); }

.site-nav__toggle { display: none; }

@media (max-width: 920px) {
  .site-nav { padding: 0.7rem 1.1rem; }
  .site-nav--overlay { height: 64px; padding: 0 1.25rem; }
  .site-nav--overlay .site-nav__logo img { height: 2.7rem; }

  .site-nav__toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    padding: 10px;
    margin-right: -8px;
    background: transparent;
    border: none;
    cursor: pointer;
  }
  .site-nav__toggle span { display: block; height: 2px; width: 100%; background: var(--ink); border-radius: 2px; transition: transform 0.2s ease, opacity 0.2s ease; }
  .site-nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .site-nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .site-nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .site-nav__menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(11, 11, 12, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
    padding: 0.25rem 1.25rem 1rem;
    display: none;
  }
  .site-nav__menu.is-open { display: flex; }
  .site-nav__menu .site-nav__link { padding: 0.9rem 0; border-bottom: 1px solid var(--line); font-size: 1.05rem; }
  .site-nav__menu .site-nav__cta { margin-top: 0.9rem; padding: 0.85rem; width: 100%; }
}

/* ===== Instant feedback: tap response + a top loading bar for page navigations ===== */
a, button { touch-action: manipulation; }
.site-nav__link { -webkit-tap-highlight-color: rgba(206, 184, 136, 0.22); }
.site-nav__link:active { color: var(--gold); }
.site-nav__cta:active { filter: brightness(0.93); transform: translateY(1px); }

#nav-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--gold);
  z-index: 9999;
  pointer-events: none;
  opacity: 0;
  transition: width 0.4s ease, opacity 0.3s ease;
}
#nav-progress.go {
  width: 92%;
  opacity: 1;
  transition: width 8s cubic-bezier(0.1, 0.85, 0.25, 1), opacity 0.15s ease;
}
@media (prefers-reduced-motion: reduce) {
  #nav-progress, #nav-progress.go { transition: opacity 0.2s ease; }
}