.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--panel);
  border-bottom: 3px solid var(--primary);
  box-shadow: 0 4px 0 rgba(139, 77, 255, 0.12);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 84px;
  gap: 1rem;
}

.brand {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--primary);
}

.brand::before {
  content: "";
  width: 14px;
  height: 14px;
  background: var(--primary);
  display: inline-block;
  clip-path: polygon(50% 0%, 62% 38%, 100% 50%, 62% 62%, 50% 100%, 38% 62%, 0% 50%, 38% 38%);
  box-shadow: 0 0 0 2px var(--secondary);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  color: var(--deep);
}

.main-nav a {
  transition: color 0.2s ease;
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--primary);
}

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

.header-button {
  white-space: nowrap;
  font-size: 0.7rem;
  padding: 0.75rem 1rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

@media (max-width: 720px) {
  .header-inner {
    flex-wrap: wrap;
    justify-content: center;
    padding: 0.9rem 0;
  }

  .main-nav {
    justify-content: center;
    flex-wrap: wrap;
  }
}