/* ---------- global accessibility (shared across marketing pages) ---------- */

/* Skip-navigation link */
.skip-nav {
  position: absolute;
  top: -100%;
  left: 12px;
  background: var(--steel, #1f3a5f);
  color: #fff;
  padding: 8px 16px;
  font-size: 0.875rem;
  font-weight: 500;
  z-index: 10000;
  text-decoration: none;
  transition: top 150ms;
}
.skip-nav:focus { top: 0; outline: 2px solid #fff; outline-offset: 2px; }

/* Global focus ring */
:focus-visible {
  outline: 2px solid var(--steel, #1f3a5f);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- primary nav (shared across marketing pages) ---------- */
/* z-index is set per-page on <header> (100) — nav dropdown is z-index 20 within that stacking context */
.header-row { position: relative; }

.site-nav {
  display: flex;
  align-items: center;
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.35rem 0;
  transition: color 160ms ease;
}
.nav-link:hover, .nav-link:focus-visible { color: var(--ink); }
.nav-link.is-active { color: var(--steel); }

.nav-trigger { display: inline-flex; align-items: center; }
.nav-trigger .caret {
  display: inline-block;
  font-size: 0.7em;
  margin-left: 0.2rem;
  transition: transform 180ms cubic-bezier(0.16, 1, 0.3, 1);
}
.nav-item.is-open .nav-trigger .caret { transform: rotate(180deg); }

.nav-item { position: relative; }

.nav-dropdown {
  position: absolute;
  top: calc(100% + 0.9rem);
  left: 50%;
  min-width: 15rem;
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: 3px 3px 0 rgba(20, 24, 28, 0.06);
  padding: 0.4rem 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translate(-50%, -6px);
  transition: opacity 180ms cubic-bezier(0.16, 1, 0.3, 1), transform 180ms cubic-bezier(0.16, 1, 0.3, 1), visibility 180ms;
  z-index: 20;
}
.nav-item.is-open .nav-dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translate(-50%, 0);
}
.nav-dropdown a {
  display: block;
  padding: 0.65rem 1.1rem;
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 0.875rem;
  color: var(--ink);
  text-decoration: none;
  border-top: 1px solid var(--line);
  transition: background 140ms ease, color 140ms ease;
}
.nav-dropdown a:first-child { border-top: none; }
.nav-dropdown a:hover, .nav-dropdown a:focus-visible { background: var(--steel-soft); color: var(--steel); }

.header-actions { display: flex; align-items: center; gap: 1.25rem; }

.nav-cta-mobile { display: none; }

/* ---------- hamburger toggle ---------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 0.3rem;
  width: 1.85rem;
  height: 1.85rem;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 1px;
  width: 100%;
  background: var(--ink);
  transition: transform 200ms cubic-bezier(0.16, 1, 0.3, 1), opacity 160ms ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .header-cta { display: none; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: grid;
    grid-template-rows: 0fr;
    align-items: stretch;
    background: var(--paper);
    opacity: 0;
    transition: grid-template-rows 260ms cubic-bezier(0.16, 1, 0.3, 1), opacity 200ms ease;
  }
  .site-nav.is-open {
    grid-template-rows: 1fr;
    opacity: 1;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }
  .nav-inner {
    overflow: hidden;
    min-height: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
  }

  .nav-link { width: 100%; padding: 1rem 1.75rem; border-top: 1px solid var(--line); }
  .nav-inner > a.nav-link:first-child,
  .nav-inner > .nav-item:first-child .nav-link { border-top: none; }

  .nav-item { width: 100%; }
  .nav-trigger { width: 100%; justify-content: space-between; }

  .nav-dropdown {
    position: static;
    display: grid;
    grid-template-rows: 0fr;
    min-width: 0;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
    box-shadow: none;
    border: none;
    background: var(--paper-2);
    padding: 0;
    transition: grid-template-rows 220ms cubic-bezier(0.16, 1, 0.3, 1);
  }
  .nav-item.is-open .nav-dropdown { grid-template-rows: 1fr; transform: none; }
  .nav-dropdown-inner { overflow: hidden; min-height: 0; }
  .nav-dropdown a { padding: 0.75rem 2.5rem; border-top: 1px solid var(--line); font-size: 0.8125rem; }

  .nav-cta-mobile {
    display: block;
    color: var(--steel);
    font-weight: 500;
  }
}

@media (prefers-reduced-motion: reduce) {
  .nav-toggle span, .nav-trigger .caret, .nav-dropdown, .site-nav { transition: none; }
}