.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(221, 227, 238, 0.8);
}

.nav-wrap {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  line-height: 1;
  text-decoration: none;
}

.brand img {
  width: auto;
  height: 36px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.main-nav a {
  color: #334155;
  font-weight: 600;
  position: relative;
}

.main-nav a:hover {
  color: var(--accent);
}

.menu-toggle {
  display: none;
  background: transparent;
  border: 0;
  font-size: 1.7rem;
  cursor: pointer;
}

@media (max-width: 900px) {
  .brand img { height: 30px; }
  .menu-toggle { display: block; }
  .main-nav {
    position: absolute;
    top: 78px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    padding: 20px 4%;
    background: #ffffff;
    border-bottom: 1px solid var(--line);
  }
  .main-nav.open { display: flex; }
}