/* Header / Nav */
header {
  background: var(--color-card);
  position: sticky;
  top: 0;
  z-index: 60;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 2px 10px rgba(15, 23, 36, 0.04);
}

nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.brand svg,
.brand img {
  width: 44px;
  height: auto;
  border-radius: 8px;
}
.brand .title {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--color-secondary);
}

nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  list-style: none;
}
.nav-a {
  padding: 0.5rem 0.75rem;
  border-radius: 10px;
  font-weight: 600;
  color: var(--color-secondary);
  transition:
    background var(--transition),
    color var(--transition);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.nav-a:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.close {
  max-height: 0;
  opacity: 0;
  pointer-events: none;
  margin-top: 0;
}

.rotated {
  transform: rotate(180deg);
}

.nav-btn {
  cursor: pointer;
  background-color: transparent;
  border: none;
  display: none;
  transition: all 0.3s ease-in-out;
  min-height: 48px;
  min-width: 48px;
  align-items: center;
  justify-content: center;
}

.nav-btn svg {
  width: 32px;
  height: 32px;
  fill: var(--color-secondary);
  transition: all 0.3s ease-in-out;
}

.nav-btn svg:hover {
  fill: var(--color-accent);
  transform: scale(1.1);
}

@media (max-width: 650px) {
  header nav {
    justify-content: center;
    gap: 0.5rem;
  }
  .nav-btn {
    width: auto;
    display: block;
  }

  .brand {
    flex-basis: auto;
    justify-content: center;
  }

  nav ul {
    justify-content: center;
    width: 100%;
  }
}