/* nav.css — shared mobile-nav drawer + hamburger toggle.
   Loaded by every page; CSS-only desktop behaviour, JS-driven drawer ≤768px. */

.nav-drawer {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: auto;
}

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 0;
  padding: 0;
  cursor: pointer;
  position: relative;
  border-radius: 4px;
  color: inherit;
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.nav-toggle > span {
  position: absolute;
  left: 11px;
  right: 11px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition:
    top 200ms ease,
    transform 200ms ease,
    opacity 200ms ease;
}

.nav-toggle > span:nth-child(1) {
  top: 14px;
}
.nav-toggle > span:nth-child(2) {
  top: 21px;
}
.nav-toggle > span:nth-child(3) {
  top: 28px;
}

.nav-toggle[aria-expanded="true"] > span:nth-child(1) {
  top: 21px;
  transform: rotate(45deg);
}
.nav-toggle[aria-expanded="true"] > span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] > span:nth-child(3) {
  top: 21px;
  transform: rotate(-45deg);
}

.nav-backdrop {
  display: none;
}

@media (max-width: 768px) {
  .nav-toggle {
    display: inline-block;
  }

  .nav-drawer {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(320px, 86vw);
    height: 100dvh;
    background: var(--bg);
    border-left: 1px solid var(--rule);
    padding: 88px 28px 32px;
    box-shadow: -16px 0 32px rgba(0, 0, 0, 0.08);
    transform: translateX(100%);
    transition: transform 240ms ease;
    z-index: 100;
    overflow-y: auto;
    display: flex !important;
    flex-direction: column;
    gap: 24px;
    align-items: stretch;
    margin: 0;
  }

  .nav-drawer[data-open="true"] {
    transform: translateX(0);
  }

  .nav-drawer .nav-links {
    display: flex !important;
    flex-direction: column;
    gap: 0;
    width: 100%;
    margin: 0;
    padding: 0;
    list-style: none;
    order: initial;
    justify-content: initial;
  }

  .nav-drawer .nav-links a {
    display: block;
    padding: 14px 0;
    font-size: 18px;
    color: var(--ink);
    text-decoration: none;
    border-bottom: 1px solid var(--rule);
  }

  .nav-drawer .nav-links a[aria-current="page"] {
    color: var(--accent);
    border-bottom-color: var(--accent);
  }

  .nav-drawer > .btn {
    margin-top: auto;
    justify-content: center;
    width: 100%;
    padding: 14px 18px;
    font-size: 15px;
  }

  .nav-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    opacity: 0;
    pointer-events: none;
    transition: opacity 240ms ease;
    z-index: 99;
  }

  .nav-backdrop[data-open="true"] {
    opacity: 1;
    pointer-events: auto;
  }

  body[data-nav-locked="true"] {
    overflow: hidden;
  }
}

@media (prefers-reduced-motion: reduce) {
  .nav-toggle > span,
  .nav-drawer,
  .nav-backdrop {
    transition: none;
  }
}