/* ========================
   NAVIGATION
======================== */
nav {
  background-color: var(--surface);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--accent);
}

.nav-menu {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  list-style: none;
  margin: 0;
  max-width: 1200px;
  margin: 0 auto;
}

.nav-menu li {
  margin: 0;
}

.nav-menu a {
  display: block;
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  font-size: var(--font-size-base);
  position: relative;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.nav-menu a:hover {
  color: var(--primary);
  background: var(--accent);
}

/* Nav bar highlight animation */
nav a::after {
  content: "";
  position: absolute;
  width: 0;
  height: 3px;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  transition: width var(--transition);
  border-radius: 3px 3px 0 0;
}

nav a:hover::after {
  width: 70%;
}

nav a.active {
  color: var(--primary);
  background: var(--accent);
}

nav a.active::after {
  width: 70%;
}

/* Mobile NAV Toggle - Hidden on desktop */
.nav-toggle {
  display: none;
}

/* ========================
   MOBILE NAVIGATION
======================== */
@media (max-width: 768px) {
  nav {
    position: fixed;
    top: auto;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    right: auto;
    background: var(--surface);
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xs);
    width: auto;
    max-width: calc(100% - var(--spacing-xl));
    border: 1px solid var(--accent);
    opacity: 1;
    visibility: visible;
    display: block;
  }

  .nav-menu {
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs);
  }

  .nav-menu a {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-md);
  }

  .nav-menu a::after {
    display: none;
  }

  .nav-toggle {
    display: none;
  }

  /* Add padding at bottom of page for floating nav */
  body {
    padding-bottom: 80px;
  }
}

/* Very small screens - stack nav vertically */
@media (max-width: 480px) {
  nav {
    bottom: var(--spacing-sm);
    left: var(--spacing-sm);
    right: var(--spacing-sm);
    transform: none;
    max-width: none;
  }

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

  .nav-menu a {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
  }
}