.site-header {
  position: sticky;
  top: 0;
  top: var(--safe-top);
  z-index: var(--z-nav);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background var(--t-base), box-shadow var(--t-base);
}

/* iOS Safari dynamic address bar */
@supports (-webkit-touch-callout: none) {
  .site-header {
    position: -webkit-sticky;
    top: env(safe-area-inset-top, 0px);
  }
}

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

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap-md);
  padding-block: 16px;
}

/* Logo */
.site-header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.site-header__logo-text {
  font-size: 20px;
  font-weight: var(--fw-bold);
  color: var(--primary);
  line-height: 1;
}

.site-header__logo-sub {
  font-size: 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 2px;
}

/* Nav */
.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav__link {
  font-size: 14px;
  font-weight: var(--fw-medium);
  color: var(--text);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: color var(--t-fast), background var(--t-fast);
  white-space: nowrap;
}

.site-nav__link:hover {
  color: var(--primary);
  background: var(--bg-light);
}

/* CTA */
.site-header__cta {
  flex-shrink: 0;
}

/* Burger */
.site-header__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
}

.site-header__burger-line {
  width: 22px;
  height: 2px;
  background: var(--text-strong);
  border-radius: var(--radius-full);
  transition: transform var(--t-base), opacity var(--t-fast);
}

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

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

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

/* Mobile */
@media (max-width: 768px) {
  .site-nav,
  .site-header__cta {
    display: none;
  }

  .site-header__burger {
    display: flex;
  }
}