/* Shared navigation and space for section links below the sticky header. */
html { scroll-padding-top: 8rem; }

header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.55rem 1.5rem;
}

.logo {
  color: var(--color-text);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

nav li { margin: 0; }

nav ul a {
  display: block;
  padding: 0.2rem 0;
  color: var(--color-muted);
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
}

nav ul a:hover,
nav ul a[aria-current="page"] { color: var(--color-accent); }

nav ul a[aria-current="page"] { font-weight: 700; }

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

@media (max-width: 800px) {
  html { scroll-padding-top: 7rem; }

  nav {
    display: block;
    padding: 0.6rem 1.5rem 0.4rem;
  }

  nav ul {
    flex-wrap: nowrap;
    gap: 1rem;
    margin-top: 0.25rem;
    padding: 0.2rem 0.2rem 0.4rem;
    overflow-x: auto;
    scrollbar-width: thin;
  }

  nav li { flex: 0 0 auto; }
}