.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-bottom: 1px solid rgba(0,0,0,0.04);
  transition: box-shadow 300ms ease, background 300ms ease;
}

.site-header.is-scrolled {
  box-shadow: 0 4px 30px rgba(0,0,0,0.04);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  height: 88px;
  width: min(1440px, calc(100% - 172px));
  margin: 0 auto;
}

.logo-link {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
}

.logo-img {
  height: 37px;
  width: auto;
}

.nav {
  display: flex;
  align-items: center;
  gap: 48px;
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 42px;
}

.nav-link {
  position: relative;
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
  padding: 8px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 4px;
  width: 100%;
  height: 1px;
  background: var(--black);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 280ms ease;
}

.nav-link:hover::after,
.nav-link.is-active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 26px;
  border: 1px solid var(--black);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
  transition: background 280ms ease, color 280ms ease;
}

.nav-cta:hover {
  background: var(--black);
  color: var(--white);
}

.burger {
  display: none;
  flex-direction: column;
  gap: 6px;
  width: 28px;
  height: 22px;
}

.burger span {
  width: 100%;
  height: 2px;
  background: var(--black);
  transition: transform 280ms ease, opacity 280ms ease;
}

.mobile-menu {
  position: fixed;
  inset: 0;
  background: var(--white);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  transform: translateY(-100%);
  transition: transform 420ms cubic-bezier(0.25, 0.8, 0.25, 1);
  z-index: 999;
}

.mobile-menu.is-open {
  transform: translateY(0);
}

.mobile-menu .nav-link {
  font-size: 16px;
}

.mobile-menu .nav-cta {
  margin-top: 12px;
}

body.menu-open {
  overflow: hidden;
}

@media (max-width: 1080px) {
  .header-inner {
    width: min(1440px, calc(100% - 64px));
  }
  .nav {
    display: none;
  }
  .burger {
    display: flex;
  }
}

@media (max-width: 680px) {
  .header-inner {
    height: 76px;
    width: min(1440px, calc(100% - 32px));
  }
  .logo-img {
    height: 32px;
  }
}