/**
 * Navigation — First Aid Fast
 * UX Spec §Component Library › 2. Navigation Bar
 */

/* --------------------------------------------------------------------------
   NAV SHELL
   -------------------------------------------------------------------------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  height: var(--nav-height-mob);
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-fast), background-color var(--transition-base);
}

[data-theme="dark"] .site-nav {
  background: var(--color-surface);
  box-shadow: 0 1px 0 var(--color-border);
}

.site-nav--scrolled {
  box-shadow: var(--shadow-md);
}

@media (min-width: 768px) {
  .site-nav { height: var(--nav-height); }
}

.site-nav__inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad-x);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* --------------------------------------------------------------------------
   LOGO
   -------------------------------------------------------------------------- */
.site-nav__logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.site-nav__logo img,
.site-nav__logo svg {
  height: 72px;
  width: auto;
}

@media (min-width: 768px) {
  .site-nav__logo img,
  .site-nav__logo svg {
    height: 90px;
  }
}

/* --------------------------------------------------------------------------
   DESKTOP LINKS (≥768px)
   -------------------------------------------------------------------------- */
.site-nav__links {
  display: none;
  align-items: center;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .site-nav__links {
    display: flex;
  }
}

.site-nav__link {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  text-decoration: none;
  padding-block: var(--space-2);
  border-bottom: 2px solid transparent;
  transition:
    color var(--transition-fast),
    border-color var(--transition-fast);
  white-space: nowrap;
}

.site-nav__link:hover {
  color: var(--color-primary-500);
  border-color: var(--color-primary-500);
}

/* Active state */
.site-nav__link--active,
.site-nav__link[aria-current="page"] {
  color: var(--color-primary-500);
  border-color: var(--color-primary-500);
  font-weight: var(--font-bold);
}

/* --------------------------------------------------------------------------
   CTA in nav (small button)
   -------------------------------------------------------------------------- */
.site-nav__cta {
  display: none;
}

@media (min-width: 768px) {
  .site-nav__cta {
    display: inline-flex;
  }
}

/* --------------------------------------------------------------------------
   HAMBURGER BUTTON (mobile only)
   -------------------------------------------------------------------------- */
.site-nav__hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  cursor: pointer;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  padding: var(--space-2);
  transition: background var(--transition-fast);
}

@media (min-width: 768px) {
  .site-nav__hamburger { display: none; }
}

.site-nav__hamburger:hover {
  background: var(--color-neutral-100);
}

.site-nav__hamburger:focus-visible {
  outline: 3px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* Hamburger bars — animate to X */
.site-nav__bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transform-origin: center;
  transition:
    transform var(--transition-slow),
    opacity var(--transition-slow);
}

/* Open state (JS adds .is-open to .site-nav__hamburger) */
.site-nav__hamburger.is-open .site-nav__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-nav__hamburger.is-open .site-nav__bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.site-nav__hamburger.is-open .site-nav__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --------------------------------------------------------------------------
   MOBILE MENU PANEL
   UX Spec: slides down, full-width, white bg
   -------------------------------------------------------------------------- */
.site-nav__mobile-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-white);
  box-shadow: var(--shadow-md);
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
  z-index: var(--z-menu);
}

[data-theme="dark"] .site-nav__mobile-menu {
  background: var(--color-surface);
}

.site-nav__mobile-menu.is-open {
  max-height: 500px;
}

/* Show only on mobile */
@media (max-width: 767px) {
  .site-nav__mobile-menu { display: block; }
}

.site-nav__mobile-links {
  display: flex;
  flex-direction: column;
  padding: var(--space-4) 0 var(--space-6);
}

.site-nav__mobile-link {
  display: flex;
  align-items: center;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  text-decoration: none;
  padding: var(--space-4) var(--container-pad-x);
  min-height: 48px;
  border-left: 4px solid transparent;
  transition:
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast);
}

.site-nav__mobile-link:hover {
  background: var(--color-primary-50);
  border-color: var(--color-primary-500);
  color: var(--color-primary-600);
}

.site-nav__mobile-link--active,
.site-nav__mobile-link[aria-current="page"] {
  background: var(--color-primary-50);
  border-color: var(--color-primary-500);
  color: var(--color-primary-500);
  font-weight: var(--font-bold);
}

[data-theme="dark"] .site-nav__mobile-link:hover,
[data-theme="dark"] .site-nav__mobile-link--active {
  background: var(--color-primary-100);
}

.site-nav__mobile-cta {
  margin: var(--space-4) var(--container-pad-x) 0;
}