/* ==========================================================================
   SITE HEADER & NAVIGATION
   Header stays light/white regardless of --color-bg-inverse elsewhere,
   so the logo always has full contrast to sit on.
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: var(--color-white);
  border-bottom: 1px solid transparent;
  transition: box-shadow var(--duration-base) var(--ease-precise),
              border-color var(--duration-base) var(--ease-precise);
}

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

.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  height: var(--header-height);
}

.site-header__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.site-header__logo img {
  height: 70px;
  width: auto;
}

/* ---------- NAV (desktop) ---------- */
.site-nav {
  margin-left: var(--space-6);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.site-nav__link {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-ink-900);
  padding-block: var(--space-2);
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  position: relative;
}

.site-nav__link::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-quick) var(--ease-precise);
}

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

.site-nav__dropdown-toggle {
  cursor: pointer;
}

.site-nav__chevron {
  transition: transform var(--duration-quick) var(--ease-precise);
}

.site-nav__item--dropdown[data-open="true"] .site-nav__chevron {
  transform: rotate(180deg);
}

.site-nav__item--dropdown {
  position: relative;
}

.site-nav__dropdown {
  position: absolute;
  top: calc(100% + var(--space-3));
  left: 0;
  min-width: 220px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity var(--duration-quick) var(--ease-precise),
              transform var(--duration-quick) var(--ease-precise),
              visibility var(--duration-quick);
}

.site-nav__item--dropdown[data-open="true"] .site-nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.site-nav__dropdown li a {
  display: block;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
}

.site-nav__dropdown li a:hover {
  background: var(--color-bg-alt);
  color: var(--color-accent-hover);
}

.site-header__cta {
  margin-left: auto;
  flex-shrink: 0;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

.site-header__toggle span {
  display: block;
  height: 2px;
  width: 22px;
  background: var(--color-ink-900);
  transition: transform var(--duration-quick) var(--ease-precise),
              opacity var(--duration-quick) var(--ease-precise);
}

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

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

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

/* ---------- RESPONSIVE ---------- */
@media (max-width: 860px) {
  .site-header__toggle {
    display: flex;
  }

  .site-header__cta {
    display: none;
  }

  .site-nav {
    position: fixed;
    inset: var(--header-height) 0 0 0;
    background: var(--color-white);
    margin-left: 0;
    transform: translateX(100%);
    transition: transform var(--duration-base) var(--ease-precise);
    overflow-y: auto;
  }

  .site-nav[data-open="true"] {
    transform: translateX(0);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-5) var(--container-pad);
  }

  .site-nav__list > li {
    border-bottom: 1px solid var(--color-border);
  }

  .site-nav__link {
    width: 100%;
    justify-content: space-between;
    padding-block: var(--space-5);
    font-size: var(--text-base);
  }

  .site-nav__dropdown {
    position: static;
    box-shadow: none;
    border: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    display: none;
    padding-left: var(--space-4);
  }

  .site-nav__item--dropdown[data-open="true"] .site-nav__dropdown {
    display: block;
  }
}