/* ==========================================================================
   Header / Masthead
   ========================================================================== */

.site-header {
  background: var(--ivory);
  position: sticky;
  top: 0;
  z-index: 50;
  padding-top: env(safe-area-inset-top, 0px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-block: 1.1rem;
}

.brand {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.brand__mark {
  font-family: var(--font-display);
  font-size: var(--step-3);
  font-weight: 700;
  color: var(--ink-green);
  letter-spacing: -0.01em;
}
.brand__mark em {
  font-style: italic;
  color: var(--bronze-gold);
}

.brand__tag {
  font-size: 0.72rem;
  color: var(--charcoal);
  opacity: 0.65;
  margin-top: 0.3rem;
  font-family: var(--font-body);
}

.main-nav__list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2vw, 2.1rem);
  margin: 0;
  padding: 0;
}

.main-nav__list a {
  font-size: var(--step-1);
  font-weight: 500;
  color: var(--charcoal);
  position: relative;
  padding-block: 0.25rem;
}

.main-nav__list a:hover {
  color: var(--adire-indigo);
}

.main-nav__list a::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  background: var(--bronze-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}
.main-nav__list a:hover::after { transform: scaleX(1); }

.site-header__cta {
  white-space: nowrap;
  flex-shrink: 0;
}

.site-header__rule {
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--ink-green) 0%,
    var(--ink-green) 60%,
    var(--bronze-gold) 60%,
    var(--bronze-gold) 80%,
    var(--adire-indigo) 80%,
    var(--adire-indigo) 100%
  );
}

/* Mobile toggle (hidden on desktop) */
.main-nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 34px;
  height: 34px;
  background: transparent;
  border: none;
  padding: 0;
}
.main-nav__toggle span {
  display: block;
  height: 2px;
  background: var(--ink-green);
  border-radius: 1px;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

@media (max-width: 820px) {
  .main-nav__toggle { display: flex; }

  .main-nav__list {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    background: var(--ivory);
    border-bottom: 1px solid var(--line);
    padding: 1rem var(--gutter) 1.5rem;
    gap: 1rem;
    display: none;
  }

  .main-nav__list.is-open { display: flex; }

  .site-header__cta { display: none; }
}