/* =========================
   NAV — WCAG 2.4.3 Focus Order, 2.4.7 Visible Focus
   ========================= */

header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(250, 250, 249, 0.78); /* --neutral-50 with alpha */
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

header .container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 16px;
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 66px;
  gap: 14px;
}

/* ===== Logo ===== */
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
  letter-spacing: -0.2px;
  padding: 10px 10px;
  border-radius: var(--radius-md);
  transition:
    background var(--transition),
    transform var(--transition);
}

.logo i {
  font-style: normal;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: linear-gradient(
    180deg,
    var(--primary-soft),
    rgba(99, 102, 241, 0.06)
  );
  border: 1px solid rgba(99, 102, 241, 0.25);
  box-shadow: 0 10px 25px rgba(67, 56, 202, 0.1);
}

.logo:hover {
  background: rgba(99, 102, 241, 0.06);
}

.logo:active {
  transform: translateY(1px);
}

.logo:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* ===== Mobile Toggle ===== */
.mobile-toggle {
  display: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 12px;
  padding: 10px 12px;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition:
    transform var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}

.mobile-toggle:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.mobile-toggle:active {
  transform: translateY(1px);
}

.mobile-toggle:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* ===== Top level links ===== */
.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links > li {
  position: relative;
}

.nav-links > li > a {
  transition:
    background var(--transition),
    color var(--transition),
    box-shadow var(--transition);

  font-size: 0.82rem;
  font-weight: 700; /* Bumped for legibility */
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color var(--transition);
  padding: 0.5rem 0.75rem; /* Larger click/tap area */
  border-radius: var(--radius-md);
  min-height: 44px; /* WCAG 2.5.5 touch target */
  display: inline-flex;
  align-items: center;
}

.nav-links > li > a:hover {
  background: rgba(99, 102, 241, 0.08);
  color: var(--text);
}

.nav-links > li > a:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* Active link helper (optional) */
.nav-links > li > a[aria-current="page"] {
  color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.18);
}

/* ===== Dropdown ===== */
.dropdown > a {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  min-width: 240px;
  padding: 8px;
  margin: 0;
  list-style: none;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition:
    opacity var(--transition),
    transform var(--transition),
    visibility var(--transition);
}

.dropdown-menu li a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 10px;
  border-radius: 12px;
  text-decoration: none;
  color: var(--muted);
  font-weight: 600;
  font-size: 14px;
  transition:
    background var(--transition),
    color var(--transition);
}

.dropdown-menu li a:hover {
  background: var(--primary-soft);
  color: var(--text);
}

.dropdown-menu li a:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* Divider look (optional) */
.dropdown-menu li + li {
  margin-top: 2px;
}

/* Show dropdown on hover + keyboard navigation */
.dropdown:hover > .dropdown-menu,
.dropdown:focus-within > .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Small caret polish */
.dropdown > a {
  user-select: none;
}

/* ===== Mobile behavior ===== */
@media (max-width: 980px) {
  .mobile-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-links {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 70px;
    display: grid;
    gap: 6px;
    padding: 10px;
    border-radius: 18px;
    border: 1px solid var(--border);
    background: var(--surface);
    box-shadow: var(--shadow-lg);

    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition:
      opacity var(--transition),
      transform var(--transition),
      visibility var(--transition);
  }

  /* Toggle this class via JS: navLinks.classList.toggle("open") */
  .nav-links.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-links > li > a {
    width: 100%;
    justify-content: space-between;
    padding: 12px 12px;
    border: 1px solid var(--border);
    background: var(--surface-2);
  }

  .nav-links > li > a:hover {
    border-color: rgba(99, 102, 241, 0.22);
  }

  /* Dropdowns become inline sections on mobile */
  .dropdown-menu {
    position: static;
    min-width: unset;
    border: none;
    box-shadow: none;
    background: transparent;
    padding: 6px 0 0;
    opacity: 1;
    visibility: visible;
    transform: none;
    display: none; /* collapsed by default */
  }

  /* Open dropdown when parent is hovered (touch won’t help) or keyboard focus enters */
  .dropdown:focus-within > .dropdown-menu {
    display: grid;
    gap: 6px;
  }

  .dropdown-menu li a {
    border: 1px solid var(--border);
    background: var(--surface);
    padding: 12px 12px;
  }
}

@media (max-width: 980px) {
  .dropdown.dd-open > .dropdown-menu {
    display: grid;
    gap: 6px;
  }
}