/* ==========================================================================
   Header / navegação fixa
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  background: transparent;
  transition: background-color var(--transition), box-shadow var(--transition), height var(--transition);
}

.site-header.is-scrolled {
  height: calc(var(--header-height) - 16px);
  background-color: rgba(20, 16, 12, 0.92);
  backdrop-filter: blur(8px);
  box-shadow: 0 1px 0 var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

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

.site-header__logo-img {
  height: 34px;
  width: auto;
}

.site-header__nav {
  display: flex;
  gap: var(--space-lg);
  margin-inline: auto;
}

.site-header__nav a {
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.site-header__nav a:hover {
  color: var(--color-gold);
}

.site-header__cta {
  flex-shrink: 0;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
}

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

.site-header__toggle.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-header__toggle.is-open span:nth-child(2) {
  opacity: 0;
}

.site-header__toggle.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 860px) {
  .site-header__nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg) 0;
    background-color: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  }

  .site-header__nav.is-open {
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
    pointer-events: auto;
  }

  .site-header__cta {
    display: none;
  }

  .site-header__toggle {
    display: flex;
  }
}