/* ==========================================================================
   Header / Navigation — Edge Pharma
   Global site navigation: logo, primary links, CTA, and the mobile drawer.
   Markup is identical and reused, unchanged, on every page.

   Per spec, ALL navigation styling (including breakpoint handling) is
   self-contained in this file rather than split across layout/grid.css
   or responsive.css.
   ========================================================================== */

/* ---------------------------------------------------------------------
   Header shell
   --------------------------------------------------------------------- */

.site-header {
  position: fixed;
  top: 0;
  inset-inline: 0;
  z-index: var(--z-header);
  height: 88px;
  display: flex;
  align-items: center;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--duration-base) var(--ease-default),
              box-shadow var(--duration-base) var(--ease-default),
              border-color var(--duration-base) var(--ease-default);
}

/* Added by navigation.js once the page scrolls past 20px.
   Height never changes — only the surface treatment does. */
.site-header.is-scrolled {
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
  border-bottom-color: transparent;
}

/* Offsets page content for the fixed header above. */
.main {
  padding-top: 88px;
}

/* ---------------------------------------------------------------------
   Navbar row
   --------------------------------------------------------------------- */

.navbar {
  display: flex;
  align-items: center;
  width: 100%;
  max-width: var(--container-max-width);
  height: 100%;
  margin-inline: auto;
  padding-inline: 32px;
}

/* ---------------------------------------------------------------------
   Logo — placeholder wordmark, SVG-ready
   Swap the two <span> lines for an <img>/<svg> in assets/images/logos/
   once a final logo asset exists; markup/classes can stay the same.
   --------------------------------------------------------------------- */

.navbar__brand {
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  line-height: 1.05;
  color: var(--color-primary);
}

.navbar__brand-primary {
  font-size: 18px;
  font-weight: var(--fw-extrabold);
  letter-spacing: 0.06em;
}

.navbar__brand-secondary {
  font-size: 10px;
  font-weight: var(--fw-semibold);
  letter-spacing: 0.34em;
}

/* ---------------------------------------------------------------------
   Navigation links
   --------------------------------------------------------------------- */

.navbar__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  font-family: var(--font-family-base);
  font-size: 16px;
  font-weight: var(--fw-medium);
  letter-spacing: 0.01em;
  color: var(--color-text-primary);
  padding-block: var(--space-2);
  transition: color 250ms var(--ease-default);
}

/* Underline animates in from the center on hover / active */
.navbar__link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
  transform: translateX(-50%);
  transition: width 250ms var(--ease-default);
}

.navbar__link:hover {
  color: var(--color-primary);
}

.navbar__link:hover::after {
  width: 100%;
}

.navbar__link.is-active {
  color: var(--color-primary);
  font-weight: var(--fw-medium);
}

.navbar__link.is-active::after {
  width: 100%;
}

/* ---------------------------------------------------------------------
   Layout spacing — logo / nav / CTA
   --------------------------------------------------------------------- */

.navbar__list {
  display: flex;
  align-items: center;
}

.navbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-left: var(--space-9); /* 48px — Navigation → CTA spacing */
}

/* Compound selectors (.btn.navbar__cta--*) beat buttons.css's plain .btn
   display rule on specificity, regardless of stylesheet load order. */
.btn.navbar__cta--desktop {
  display: none;
}

/* Nav CTA is a teal, small-radius button — distinct from the pill-shaped
   .btn--primary used elsewhere (hero CTAs, etc.). */
.btn.navbar__cta {
  background-color: var(--color-secondary);
  border-radius: var(--radius-sm);
}

.btn.navbar__cta:hover {
  background-color: #0f9c8d;
}

/* ---------------------------------------------------------------------
   Hamburger toggle (mobile)
   --------------------------------------------------------------------- */

.navbar__toggle {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  gap: 5px;
  width: 44px;
  height: 44px;
}

.navbar__toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: transform var(--duration-base) var(--ease-default),
              opacity var(--duration-base) var(--ease-default);
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-bar:nth-child(2) {
  opacity: 0;
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------------------------------------------------------------------
   Mobile menu (drawer) — slides in from the right, <992px
   --------------------------------------------------------------------- */

.navbar__menu {
  position: fixed;
  top: 0;
  right: 0;
  z-index: var(--z-overlay);
  display: flex;
  flex-direction: column;
  width: 320px;
  max-width: 85vw;
  height: 100vh;
  background-color: var(--color-white);
  box-shadow: var(--shadow-xl);
  padding: var(--space-9) var(--space-7);
  margin-left: auto; /* Logo → Navigation spacing, once un-drawered at desktop */
  transform: translateX(100%);
  transition: transform var(--duration-base) var(--ease-default);
}

.navbar__menu.is-open {
  transform: translateX(0);
}

.navbar__close {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  align-self: flex-end;
  width: 44px;
  height: 44px;
}

.navbar__close-bar {
  display: block;
  position: absolute;
  width: 22px;
  height: 2px;
  background-color: var(--color-text-primary);
}

.navbar__close-bar:first-child {
  transform: rotate(45deg);
}

.navbar__close-bar:last-child {
  transform: rotate(-45deg);
}

.navbar__cta--mobile {
  width: 100%;
  justify-content: center;
}

/* Backdrop behind the mobile drawer */
.navbar__overlay {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-overlay) - 1);
  background-color: rgba(16, 24, 32, 0.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-base) var(--ease-default);
}

.navbar__overlay.is-visible {
  opacity: 1;
  pointer-events: auto;
}

/* Mobile-first: the drawer's own nav list is a centered column */
.navbar__menu .navbar__list {
  flex: 1;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-7); /* 32px */
}

/* ---------------------------------------------------------------------
   Desktop (≥992px) — collapse the drawer back into an inline row
   --------------------------------------------------------------------- */

@media (min-width: 992px) {
  .navbar__toggle,
  .navbar__close,
  .navbar__overlay {
    display: none;
  }

  .btn.navbar__cta--mobile {
    display: none;
  }

  .btn.navbar__cta--desktop {
    display: inline-flex;
  }

  .navbar__menu {
    position: static;
    width: auto;
    max-width: none;
    height: auto;
    background: none;
    box-shadow: none;
    padding: 0;
    transform: none;
    transition: none;
  }

  .navbar__menu .navbar__list {
    flex-direction: row;
    gap: var(--space-8); /* 40px — Navigation Gap */
  }
}

/* ---------------------------------------------------------------------
   Focus states (keyboard accessibility)
   --------------------------------------------------------------------- */

.navbar__link:focus-visible,
.navbar__brand:focus-visible,
.navbar__toggle:focus-visible,
.navbar__close:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}