.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--bg) 85%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-1) var(--ease-standard);
}
.header.scrolled { border-bottom-color: var(--border); }
.header-inner {
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.02em;
  color: var(--fg);
}
.logo img { height: 88px; width: auto; display: block; }
@media (max-width: 700px) { .logo img { height: 56px; } }
[data-theme="dark"] .logo img { filter: brightness(0) invert(1); }

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-item {
  position: relative;
  padding: 8px 14px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 15px;
  color: var(--fg);
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: background var(--dur-1) var(--ease-standard);
}
.nav-item:hover, .nav-item.active { background: var(--bg-muted); }
.nav-item .caret {
  transition: transform var(--dur-1) var(--ease-standard);
}
.nav-item.open .caret { transform: rotate(180deg); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-right: 8px;
}
.nav-cta {
  padding: 11px 22px;
  font-size: 15px;
  margin-right: 4px;
}

.dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 320px;
  background: var(--surface-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow-lg);
  padding: 8px;
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(-4px);
  transition: opacity var(--dur-1) var(--ease-standard),
              transform var(--dur-2) var(--ease-standard);
}