/* ==========================================================================
   Site Header — Section 5 & 38
   ========================================================================== */

.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 1000;
  height: var(--header-height-scrolled);
  display: flex;
  align-items: center;
  background: var(--color-navy);
  transition: background var(--transition-base), height var(--transition-base), box-shadow var(--transition-base);
}

/* Transparent overlay on the home hero, before scrolling */
.site-header.is-transparent {
  background: linear-gradient(to bottom, rgba(7,50,74,0.65), rgba(7,50,74,0));
  height: var(--header-height);
}

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

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

.site-header__logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
}

.site-header__logo img,
.site-header__logo svg {
  height: 40px;
  width: auto;
  display: block;
}

.site-header__logo-text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  color: var(--color-white);
  transition: color var(--transition-base);
}
.site-header.is-scrolled .site-header__logo-text { color: var(--color-navy); }

/* Desktop nav */
.site-nav {
  display: none;
}

@media (min-width: 1024px) {
  .site-nav {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    flex: 1;
    justify-content: center;
  }

  .site-nav__list {
    display: flex;
    gap: var(--space-md);
  }

  .site-nav__link {
    position: relative;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-white);
    padding: 0.5rem 0.1rem;
    transition: color var(--transition-fast);
  }

  .site-nav__link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    height: 2px;
    width: 0;
    background: var(--color-orange);
    transition: width var(--transition-fast);
  }

  .site-nav__link:hover::after,
  .site-nav__link.is-active::after {
    width: 100%;
  }

  .site-nav__link.is-active {
    color: var(--color-orange);
  }

  .site-header.is-scrolled .site-nav__link {
    color: var(--color-navy);
  }
  .site-header.is-scrolled .site-nav__link.is-active {
    color: var(--color-orange);
  }
}

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

.site-header__cta {
  display: none;
}
@media (min-width: 1024px) {
  .site-header__cta { display: inline-flex; }
}

/* Mobile hamburger */
.site-header__toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  flex-direction: column;
  gap: 5px;
}
@media (min-width: 1024px) {
  .site-header__toggle { display: none; }
}

.site-header__toggle span {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--color-white);
  transition: transform var(--transition-fast), opacity var(--transition-fast), background var(--transition-fast);
}
.site-header.is-scrolled .site-header__toggle span { background: var(--color-navy); }

.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); }

/* Mobile slide menu */
.mobile-nav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(85vw, 360px);
  background: var(--color-white);
  box-shadow: var(--shadow-md);
  z-index: 1100;
  padding: var(--space-lg) var(--space-md);
  transform: translateX(100%);
  transition: transform var(--transition-base);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
.mobile-nav.is-open {
  transform: translateX(0);
}
@media (min-width: 1024px) {
  .mobile-nav { display: none; }
}

.mobile-nav__close {
  align-self: flex-end;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--color-navy);
}

.mobile-nav__list {
  margin-top: var(--space-md);
  display: flex;
  flex-direction: column;
}

.mobile-nav__link {
  display: block;
  padding: 0.9rem 0.25rem;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-navy);
  border-bottom: 1px solid var(--color-border);
}
.mobile-nav__link.is-active { color: var(--color-orange); }

.mobile-nav__cta {
  margin-top: var(--space-lg);
}

.mobile-nav-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(7,50,74,0.5);
  z-index: 1050;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}
.mobile-nav-backdrop.is-open {
  opacity: 1;
  pointer-events: auto;
}

/* Push page content below fixed header */
.site-main {
  padding-top: var(--header-height-scrolled);
}
.site-main.has-hero {
  padding-top: 0; /* hero sits under transparent header */
}

body.nav-open {
  overflow: hidden;
}