/* ─── Nav ────────────────────────────────────────────────── */
/*
  Sticky top navigation bar: logo, desktop links with dropdown,
  social icons, mobile hamburger, and the off-canvas drawer.
  Source of truth: prototype-home.html (canonical nav source).
  .nav__search-btn added from prototype-category.html (mobile search).
*/

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-accent);
  height: var(--nav-height);
}

.nav__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-m);
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  text-decoration: none;
}

.nav__logo {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.nav__logo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.nav__wordmark {
  font-family: "Playfair Display", Georgia, serif;
  font-size: var(--step-0);
  font-weight: 600;
  text-transform: lowercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--color-accent);
}

/* Desktop links — hidden on mobile, revealed at 48rem breakpoint */
.nav__links {
  display: none;
  align-items: center;
  gap: var(--space-l);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.nav__links > a {
  position: relative;
  text-decoration: none;
  color: var(--color-text-muted);
  transition: color 0.15s ease;
}

.nav__links > a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.2em;
  height: 3px;
  background-color: var(--color-accent);
  opacity: 0;
  transform: translateY(6px);
  transition:
    opacity 0.25s ease-out,
    transform 0.25s ease-out;
}

.nav__links > a:hover,
.nav__links > a:focus-visible {
  color: var(--color-text);
}

.nav__links > a:hover::after,
.nav__links > a:focus-visible::after {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .nav__links > a::after {
    transform: none;
  }
}

/* Blog dropdown — revealed on hover or keyboard focus, CSS-only */
.nav__dropdown {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  cursor: pointer;
  color: var(--color-text-muted);
  transition: color 0.15s ease;
}

.nav__dropdown-link {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  text-decoration: none;
  color: inherit;
}

/* Underline bar — a separate pseudo-element from the hover-bridge
   ::after below, since that one is already spoken for. */
.nav__dropdown::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.2em;
  height: 3px;
  background-color: var(--color-accent);
  opacity: 0;
  transform: translateY(6px);
  transition:
    opacity 0.25s ease-out,
    transform 0.25s ease-out;
}

.nav__dropdown:hover,
.nav__dropdown:focus-within {
  color: var(--color-text);
}

.nav__dropdown:hover::before,
.nav__dropdown:focus-within::before {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .nav__dropdown::before {
    transform: none;
  }
}

/*
  Invisible hover bridge. The 0.75rem gap below the trigger (see
  `top: calc(100% + 0.75rem)` on .nav__dropdown-menu) belongs to
  neither element, so a mouse moving diagonally from "Blog" toward a
  menu item crosses that dead zone, drops out of :hover, and the menu
  collapses before the cursor ever reaches it. This pseudo-element
  fills the gap so hover stays continuous across it. It lives on
  .nav__dropdown (always interactive) rather than .nav__dropdown-menu,
  which has pointer-events: none while closed and so can't catch the
  hover needed to reopen itself.
*/
.nav__dropdown::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 0;
  width: 10rem; /* matches .nav__dropdown-menu's min-width */
  height: 0.75rem;
}

.nav__dropdown-arrow {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  transition: transform 0.2s ease;
}

.nav__dropdown:hover .nav__dropdown-arrow,
.nav__dropdown:focus-within .nav__dropdown-arrow {
  transform: rotate(180deg);
}

.nav__dropdown-menu {
  position: absolute;
  top: calc(100% + 0.75rem);
  left: 0;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: var(--space-xs) 0;
  min-width: 10rem;
  box-shadow: 0 4px 16px rgb(0 0 0 / 0.08);
  /*
    Animate in/out without display:none so transitions work. Hidden via
    opacity + pointer-events (not visibility) so the menu links stay in
    the tab order and accessibility tree while collapsed — visibility:
    hidden would remove them, making the category links unreachable by
    keyboard since :focus-within could never fire.
  */
  opacity: 0;
  pointer-events: none;
  transform: translateY(-4px);
  transition:
    opacity 0.15s ease,
    transform 0.15s ease;
}

.nav__dropdown:hover .nav__dropdown-menu,
.nav__dropdown:focus-within .nav__dropdown-menu {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.nav__dropdown-menu a {
  display: block;
  padding: var(--space-xs) var(--space-m);
  text-decoration: none;
  color: var(--color-text-muted);
  transition:
    color 0.15s ease,
    background-color 0.15s ease;
}

.nav__dropdown-menu a:hover {
  color: var(--color-text);
  background-color: var(--color-surface-hover);
}

.nav__right {
  display: flex;
  align-items: center;
  gap: var(--space-s);
}

/* Social icons — hidden on mobile, revealed at 48rem breakpoint */
.nav__social {
  display: none;
  align-items: center;
  gap: var(--space-xs);
}

.nav__social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  text-decoration: none;
  color: var(--color-text-muted);
  transition:
    color 0.15s ease,
    transform 0.15s ease;
}

.nav__social a:hover {
  color: var(--color-text);
  transform: translateY(-2px);
}

@media (prefers-reduced-motion: reduce) {
  .nav__social a:hover {
    transform: none;
  }
}

/* Theme toggle button — next to social icons */
.nav__theme-toggle {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  color: var(--color-text-muted);
  transition: color 0.15s ease;
}

.nav__theme-toggle:hover,
.nav__theme-toggle:focus-visible {
  color: var(--color-text);
}

/*
  Sun/moon icon swap driven purely by aria-pressed — no extra
  data attribute needed since JS already sets it.
  Both icons are in the DOM; we cross-fade between them.
*/
.nav__theme-toggle-icon {
  position: absolute;
  transition:
    opacity 0.2s ease,
    transform 0.2s ease;
}

/* Sun visible (light mode: aria-pressed="false") */
.nav__theme-toggle-icon--sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* Moon hidden in light mode */
.nav__theme-toggle-icon--moon {
  opacity: 0;
  transform: rotate(-30deg) scale(0.8);
}

/* Dark mode (aria-pressed="true"): swap icons */
.nav__theme-toggle[aria-pressed="true"] .nav__theme-toggle-icon--sun {
  opacity: 0;
  transform: rotate(30deg) scale(0.8);
}

.nav__theme-toggle[aria-pressed="true"] .nav__theme-toggle-icon--moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

@media (prefers-reduced-motion: reduce) {
  .nav__theme-toggle {
    transition: none;
  }

  .nav__theme-toggle-icon {
    transition: none;
  }
}

/*
  Mobile search trigger — <pagefind-modal-trigger> web component replaces the
  old <button data-search-trigger> element. Desktop trigger sits inside
  .nav__links (hidden on mobile via parent). Mobile trigger has
  .nav__search-btn--mobile for the responsive hide at 48rem. The trigger's
  own appearance (icon, modal footer) is styled in pagefind-modal.css.
*/
.nav__search-btn--mobile {
  display: flex;
}

/* Hamburger button — mobile only */
.nav__hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
}

.nav__hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-accent);
  transition:
    transform 0.2s ease,
    opacity 0.2s ease;
}

/* ─── Mobile drawer ──────────────────────────────────────── */
/*
  Full-screen overlay revealed when the hamburger is pressed.
  Uses display:flex so gap and flex-direction apply when open.
*/
.nav__drawer {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--color-bg);
  padding: var(--space-l) var(--space-m);
  flex-direction: column;
  gap: var(--space-m);
  overflow-y: auto;
}

.nav__drawer.is-open {
  display: flex;
}

.nav__drawer-close {
  align-self: flex-end;
  font-size: var(--step-1);
  color: var(--color-text);
  line-height: 1;
}

.nav__drawer-nav {
  display: flex;
  flex-direction: column;
}

/* "Blog" rendered as a non-link section label */
.nav__drawer-section-label {
  display: block;
  font-size: var(--step-1);
  font-weight: 500;
  padding-block: var(--space-s);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
  text-decoration: none;
  transition: background-color 0.15s ease;
}

.nav__drawer-section-label:hover {
  background-color: var(--color-surface-hover);
}

/* Categories nested under Blog, indented */
.nav__drawer-sub a {
  display: block;
  padding-block: var(--space-s);
  padding-inline-start: var(--space-m);
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
  font-size: var(--step-0);
  color: var(--color-text-muted);
  transition:
    color 0.15s ease,
    background-color 0.15s ease;
}

.nav__drawer-sub a:hover {
  color: var(--color-text);
  background-color: var(--color-surface-hover);
}

.nav__drawer-nav > a {
  display: block;
  padding-block: var(--space-s);
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
  font-size: var(--step-1);
  font-weight: 500;
  color: var(--color-text);
  transition: background-color 0.15s ease;
}

.nav__drawer-nav > a:hover {
  background-color: var(--color-surface-hover);
}

.nav__drawer-social {
  display: flex;
  justify-content: center;
  gap: var(--space-s);
  margin-block-start: var(--space-s);
}

.nav__drawer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  text-decoration: none;
  color: var(--color-text-muted);
  transition:
    color 0.15s ease,
    transform 0.15s ease;
}

.nav__drawer-social a:hover {
  color: var(--color-text);
  transform: translateY(-2px);
}

@media (prefers-reduced-motion: reduce) {
  .nav__drawer-social a:hover {
    transform: none;
  }
}

/* ─── Responsive ─────────────────────────────────────────── */
/*
  48rem (768px): switch from hamburger to desktop link layout.
  Social icons appear, hamburger and mobile search button hide.
*/
@media (min-width: 48rem) {
  .nav {
    --nav-height: 4.375rem;
  }

  /* 3-column grid: logo | links (centered) | right icons — true centering */
  .nav__inner {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 0;
  }

  .nav__inner > a {
    justify-self: start;
  }

  .nav__right {
    justify-self: end;
  }

  .nav__links,
  .nav__social {
    display: flex;
  }

  .nav__hamburger {
    display: none;
  }

  /* Mobile search button hidden on desktop — desktop button is in .nav__links */
  .nav__search-btn--mobile {
    display: none;
  }
}