/* 05-navigation.css — two-tier responsive navigation */
.site-header{
  padding-top: clamp(1rem, 2vw, 1.5rem);
}

.site-header__top{
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: var(--space-6);
  align-items: center;
}

.brand{
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  min-width: 0;
}

.brand__logo{
  width: 4.4rem;
  height: auto;
  flex: none;
}

.brand__title{
  display: inline-block;
  font-weight: 700;
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  line-height: 1.2;
  color: var(--color-white);
}

.partner-mark{
  justify-self: end;
}

.partner-mark__logo{
  width: 4.4rem;
  height: auto;
}

.nav-toggle{
  display: none;
  align-items: center;
  gap: .7rem;
  justify-self: end;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: .8rem 1rem;
  background: rgba(255,255,255,.08);
  color: var(--color-white);
  cursor: pointer;
  transition: transform var(--transition-base), background var(--transition-base), border-color var(--transition-base);
}
.nav-toggle:hover{
  transform: translateY(-1px);
  background: rgba(255,255,255,.12);
}
.nav-toggle:focus-visible{
  outline: none;
  box-shadow: var(--focus-ring);
}
.nav-toggle__icon{
  width: 1rem;
  height: .75rem;
  position: relative;
}
.nav-toggle__icon::before,
.nav-toggle__icon::after,
.nav-toggle__icon{
  border-top: 2px solid currentColor;
}
.nav-toggle__icon::before,
.nav-toggle__icon::after{
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
}
.nav-toggle__icon::before{ top: .18rem; }
.nav-toggle__icon::after{ top: .5rem; }

.site-header__nav-row{
  display: flex;
  justify-content: flex-end;
  margin-top: var(--space-4);
}

.primary-nav{
  width: fit-content;
  max-width: 100%;
  border-radius: var(--radius-nav);
  padding: .95rem 1.25rem;
  background: rgba(255,255,255,.09);
}

.primary-nav__list{
  display: flex;
  align-items: center;
  gap: clamp(.8rem, 2vw, 1.6rem);
  flex-wrap: wrap;
}

.primary-nav__link{
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: .4rem 0;
  font-size: .88rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(247,250,252,.92);
  transition: color var(--transition-base), opacity var(--transition-base);
}
.primary-nav__link::after{
  content: "";
  position: absolute;
  left: 0;
  bottom: -.08rem;
  width: 100%;
  height: 2px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--color-teal), rgba(255,255,255,.55));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}
.primary-nav__link:hover::after,
.primary-nav__link:focus-visible::after,
.primary-nav__link.is-active::after{
  transform: scaleX(1);
}
.primary-nav__link:hover,
.primary-nav__link:focus-visible{
  color: var(--color-white);
  outline: none;
}
.primary-nav__link:focus-visible{
  box-shadow: var(--focus-ring);
  border-radius: .35rem;
}

.site-header.is-scrolled .primary-nav{
  background: rgba(5, 24, 38, .54);
  backdrop-filter: blur(20px);
}
.site-header.is-scrolled .site-header__top{
  transform: translateY(-2px);
  transition: transform var(--transition-base);
}