.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 18px clamp(16px, 4vw, 80px) 0;
  transition: padding var(--transition-base);
}

.site-header__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 10px 12px 10px 16px;
  background: linear-gradient(90deg, rgba(10, 18, 36, 0.7) 0%, rgba(13, 23, 51, 0.5) 65%, rgba(23, 46, 97, 0.38) 100%);
  border-radius: 26px;
  box-shadow: 0 14px 32px -10px rgba(0, 0, 20, 0.26);
  transition: box-shadow var(--transition-base);
}

.site-header.is-scrolled .site-header__inner {
  box-shadow: 0 18px 40px -8px rgba(0, 0, 20, 0.4);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand__mark {
  width: 66px;
  height: 52px;
  object-fit: contain;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand__name {
  font-weight: 600;
  font-size: 20px;
  letter-spacing: 0.6px;
  color: var(--white);
}

.brand__descriptor {
  font-weight: 600;
  font-size: 8px;
  letter-spacing: 1px;
  color: var(--brand-orange);
  white-space: nowrap;
}

/* Навигация */
.primary-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-chip {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.4px;
  color: #ebf0ff;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  background: rgba(255, 255, 255, 0.06);
  white-space: nowrap;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.nav-chip--blue { border-color: rgba(18, 91, 235, 0.38); }
.nav-chip--pink { border-color: rgba(240, 0, 117, 0.38); }
.nav-chip--orange { border-color: rgba(255, 122, 0, 0.38); }

.nav-chip--blue:hover, .nav-chip--blue:focus-visible, .nav-chip--blue.is-active { background: rgba(18, 91, 235, 0.22); }
.nav-chip--pink:hover, .nav-chip--pink:focus-visible, .nav-chip--pink.is-active { background: rgba(240, 0, 117, 0.22); }
.nav-chip--orange:hover, .nav-chip--orange:focus-visible, .nav-chip--orange.is-active { background: rgba(255, 122, 0, 0.22); }

.nav-chip:active {
  transform: scale(0.96);
}

/* Кнопка-бургер (скрыта на десктопе) */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-pill);
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}