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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: rgba(245, 243, 238, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base), background-color var(--transition-base);
}

.site-header.is-scrolled {
  border-bottom-color: var(--color-border-light);
  background-color: rgba(245, 243, 238, 0.95);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.site-header__logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  gap: 0;
}

.site-header__logo-text {
  font-family: var(--font-heading);
  font-size: clamp(1.25rem, 1.1rem + 0.5vw, 1.5rem);
  font-weight: var(--font-black);
  color: var(--color-black);
  letter-spacing: -0.03em;
  text-transform: uppercase;
  transition: opacity var(--transition-fast);
}

.site-header__logo:hover .site-header__logo-text {
  opacity: 0.8;
}

/* Hamburger menu */
.site-header__menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
  z-index: 101;
}

.site-header__menu-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background-color: var(--color-text);
  transition: all var(--transition-base);
  transform-origin: center;
}

.site-header__menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg) translate(4.5px, 4.5px);
}

.site-header__menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.site-header__menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg) translate(4.5px, -4.5px);
}

@media (max-width: 768px) {
  .site-header__menu-toggle {
    display: flex;
  }
}