/* ==========================================================================
   Site header / navigation — shared across all pages
   Desktop metrics from UI.pdf (1440): height 98px, logo 101×41, nav gap 34px,
   logo↔nav / nav↔CTA gap 93px, CTA 154×48 @ radius 5px
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background-color: transparent;
  border-bottom: 1px solid transparent;
  box-shadow: none;
  transition:
    background-color 0.35s ease,
    border-color 0.35s ease,
    box-shadow 0.35s ease,
    backdrop-filter 0.35s ease;
}

.site-header.is-scrolled {
  background-color: rgba(255, 255, 255, 0.97);
  border-bottom-color: rgba(var(--color-primary-rgb), 0.08);
  box-shadow: 0 4px 20px rgba(var(--color-primary-rgb), 0.06);
  backdrop-filter: blur(10px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 0;
  box-sizing: border-box;
  height: 98px;
  padding-block: 0;
  transition: height 0.35s ease, min-height 0.35s ease, padding 0.35s ease;
}

.site-header.is-scrolled .site-header__inner {
  height: 72px;
}

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

.site-header__logo-img {
  display: block;
  width: 130px;
  height: auto;
  object-fit: contain;
  transition: width 0.35s ease;
}

.site-header.is-scrolled .site-header__logo-img {
  width: 101px;
}

.site-header__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: 6px;
  margin-inline-start: auto;
}

.site-header__toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--color-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.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);
}

.site-nav {
  position: fixed;
  inset: 0 0 0 30%;
  z-index: var(--z-nav-drawer);
  background-color: var(--color-white);
  padding: var(--space-9) var(--space-6) var(--space-6);
  transform: translateX(100%);
  transition: transform var(--transition-base);
  box-shadow: var(--shadow-card-hover);
  overflow-y: auto;
}

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

.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.site-nav__list a {
  font-weight: var(--fw-semibold);
  font-size: 1rem;
  color: var(--color-body);
}

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

.site-nav__list a[aria-current="page"] {
  position: relative;
}

.site-nav__list a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 1px;
  background-color: var(--color-primary);
}

.site-header__cta {
  display: none;
}

.site-nav__cta {
  display: block;
  margin-top: var(--space-6);
  text-align: center;
}

.nav-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 15, 40, 0.4);
  z-index: 150;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.nav-backdrop[data-open="true"] {
  opacity: 1;
  pointer-events: auto;
}

@media (min-width: 1024px) {
  .site-header__toggle,
  .nav-backdrop {
    display: none;
  }

  .site-header__inner {
    justify-content: space-between;
  }

  .site-nav {
    position: static;
    inset: auto;
    transform: none;
    box-shadow: none;
    padding: 0;
    background: none;
    overflow: visible;
    flex: 1 1 auto;
    margin-inline-start: 0;
    display: flex;
    justify-content: center;
  }

  .site-nav__list {
    flex-direction: row;
    align-items: center;
    gap: 34px;
  }

  .site-nav__list a {
    font-size: 16px;
    font-weight: var(--fw-semibold);
    line-height: 1.7;
    white-space: nowrap;
  }

  .site-nav__list a[aria-current="page"]::after {
    bottom: -2px;
    height: 1px;
  }

  .site-nav__cta {
    display: none;
  }

  .site-header__cta {
    display: inline-flex;
    flex-shrink: 0;
    box-sizing: border-box;
    width: 160px;
    height: 48px;
    padding: 0 26px;
    margin-inline-start: 0;
    font-size: 14px;
    transition: height 0.35s ease, width 0.35s ease, padding 0.35s ease, font-size 0.35s ease;
  }

  .site-header.is-scrolled .site-header__cta {
    width: 148px;
    height: 42px;
    padding: 0 22px;
    font-size: 13px;
  }
}

@media (max-width: 1023px) {
  .site-header__inner {
    height: auto;
    min-height: 72px;
    gap: var(--space-4);
    padding-block: var(--space-4);
  }

  .site-header.is-scrolled .site-header__inner {
    height: auto;
    min-height: 60px;
    padding-block: 10px;
  }

  .site-header__logo-img {
    width: 88px;
    height: auto;
  }

  .site-header.is-scrolled .site-header__logo-img {
    width: 76px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header,
  .site-header__inner,
  .site-header__logo-img,
  .site-header__cta {
    transition: none;
  }
}