/* ==========================================================================
   Header / navigation
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: var(--color-white);
  transition: box-shadow var(--dur) var(--ease);
}

.site-header.is-scrolled {
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  height: var(--header-h);
}

/* Logo ------------------------------------------------------------------- */
.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  flex-shrink: 0;
  color: var(--color-navy);
}

.logo__mark {
  width: 50px;
  height: auto;
}

.logo__text {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-family: var(--font-heading);
  line-height: 1;
}

.logo__name {
  font-size: 1.6rem;
  font-weight: var(--fw-bold);
  letter-spacing: -0.02em;
}

.logo__sub {
  margin-top: 0.2rem;
  font-size: 0.56rem;
  font-weight: var(--fw-semibold);
  letter-spacing: 0.55em;
  margin-right: -0.55em; /* balance trailing letter-spacing */
}

/* Primary nav (desktop) -------------------------------------------------- */
.primary-nav {
  margin-inline: auto;
}

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.2vw, 2.1rem);
}

.primary-nav__link {
  position: relative;
  display: block;
  padding: 0.5rem 0;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: var(--fw-medium);
  color: var(--color-navy);
  transition: color var(--dur-fast) var(--ease);
}

.primary-nav__link::after {
  content: "";
  position: absolute;
  left: -0.4rem;
  right: -0.4rem;
  bottom: -0.35rem;
  height: 2px;
  border-radius: 2px;
  background: var(--color-blue);
  transform: scaleX(0);
  transition: transform var(--dur) var(--ease);
}

.primary-nav__link:hover,
.primary-nav__link[aria-current="page"] {
  color: var(--color-blue);
}

.primary-nav__link:hover::after,
.primary-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.site-header__cta {
  flex-shrink: 0;
}

/* Hamburger -------------------------------------------------------------- */
.nav-toggle {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  margin-left: auto;
  border-radius: var(--radius-sm);
  color: var(--color-navy);
}

.nav-toggle__bar,
.nav-toggle__bar::before,
.nav-toggle__bar::after {
  position: absolute;
  left: 10px;
  width: 24px;
  height: 2.5px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur-fast);
}

.nav-toggle__bar {
  top: calc(50% - 1.25px);
}

.nav-toggle__bar::before,
.nav-toggle__bar::after {
  content: "";
  left: 0;
}

.nav-toggle__bar::before { top: -7px; }
.nav-toggle__bar::after  { top: 7px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bar {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar::before {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar::after {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile drawer ---------------------------------------------------------- */
.nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-drawer) - 1);
  background: rgba(7, 28, 60, 0.45);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur) var(--ease), visibility var(--dur);
}

.nav-backdrop.is-visible {
  opacity: 1;
  visibility: visible;
}

.drawer-cta {
  display: none;
}

@media (max-width: 1023.98px) {
  .nav-toggle {
    display: block;
    z-index: calc(var(--z-drawer) + 1);
  }

  /* nav leaves the flow, so the row becomes: logo | cta | toggle */
  .site-header__cta {
    margin-left: auto;
  }

  .nav-toggle {
    margin-left: 0;
  }

  .site-header__inner {
    gap: var(--space-3);
  }

  .primary-nav {
    position: fixed;
    top: 0;
    right: 0;
    z-index: var(--z-drawer);
    display: flex;
    flex-direction: column;
    width: min(340px, 86vw);
    height: 100dvh;
    margin: 0;
    padding: calc(var(--header-h) + var(--space-4)) var(--space-6) var(--space-6);
    background: var(--color-white);
    box-shadow: var(--shadow-lg);
    overflow-y: auto;
    transform: translateX(100%);
    visibility: hidden;
    /* hide only after the slide-out finishes */
    transition: transform var(--dur) var(--ease), visibility 0s linear var(--dur);
  }

  .primary-nav.is-open {
    transform: translateX(0);
    visibility: visible;
    /* become focusable immediately on open */
    transition: transform var(--dur) var(--ease), visibility 0s;
  }

  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .primary-nav__link {
    padding: 0.95rem 0;
    font-size: var(--fs-md);
    border-bottom: 1px solid var(--color-border);
  }

  .primary-nav__link::after {
    left: 0;
    right: auto;
    top: 50%;
    bottom: auto;
    width: 3px;
    height: 1.2em;
    margin-left: -1rem;
    transform: translateY(-50%) scaleY(0);
  }

  .primary-nav__link:hover::after,
  .primary-nav__link[aria-current="page"]::after {
    transform: translateY(-50%) scaleY(1);
  }

  .drawer-cta {
    display: inline-flex;
    margin-top: var(--space-6);
    width: 100%;
  }
}

@media (max-width: 599.98px) {
  :root { --header-h: 64px; }

  .site-header__cta { display: none; }
  .nav-toggle { margin-left: auto; }

  .logo__mark { width: 40px; }
  .logo__name { font-size: 1.35rem; }
  .logo__sub  { font-size: 0.5rem; }
}