/**
 * iPin Modern — Navigation
 */

#topmenu {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: var(--bg-nav);
  border-bottom: 3px solid transparent;
  border-image: var(--grad-brand) 1;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  transition: background var(--dur), box-shadow var(--dur);
}

.nav-inner {
  width: 100%;
  max-width: var(--max-grid);
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  align-items: center;
  gap: 28px;
}

/* Logo as span (when custom logo present — avoids nested <a>, WCAG 4.1.1) */
.navbar-brand--logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  line-height: 1;
}

.navbar-brand--logo .custom-logo-link {
  display: flex;
  align-items: center;
}

.navbar-brand--logo .custom-logo-link img {
  height: 52px;
  width: auto;
}

/* ── Brand / logo ── */
.navbar-brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.75rem;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
  flex-shrink: 0;
  line-height: 1;
  letter-spacing: -.01em;
}
.navbar-brand img { height: 52px; width: auto; background: none; -webkit-text-fill-color: initial; }

/* ── Nav wrapper ── */
#nav-main {
  display: flex;
  align-items: center;
  flex: 1;
  gap: 16px;
  min-width: 0;
}

/* ── Menu list ── */
#nav-main ul.nav-list {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 4px;
  flex: 1;
  min-width: 0;
  flex-wrap: wrap;
}
#nav-main ul.nav-list > li { position: relative; }

#nav-main ul.nav-list li a {
  display: block;
  padding: 9px 18px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: .95rem;
  color: var(--txt-secondary);
  white-space: nowrap;
  transition: background var(--dur), color var(--dur);
}
#nav-main ul.nav-list li a:hover,
#nav-main ul.nav-list li.active > a {
  background: var(--grad-card-hover);
  color: var(--clr-accent-1);
}

/* ── Dropdown menus ── */
#nav-main ul.nav-list li ul.dropdown-menu {
  /* Use visibility+opacity instead of display:none so @keyframes actually runs.
     display:none prevents animation; pointer-events:none blocks interaction
     when hidden so it's functionally equivalent for mouse users. */
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  min-width: 190px;
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  z-index: 200;
  list-style: none;
  /* Hidden state */
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
  transition: opacity var(--dur) var(--ease),
              transform var(--dur) var(--ease),
              visibility 0s var(--dur);  /* delay visibility:hidden until after fade */
}

@keyframes dropFade {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Visible state — desktop hover and keyboard focus-within */
#nav-main ul.nav-list li:hover > ul.dropdown-menu,
#nav-main ul.nav-list li:focus-within > ul.dropdown-menu,
#nav-main ul.nav-list li.dropdown-open > ul.dropdown-menu {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
  transition: opacity var(--dur) var(--ease),
              transform var(--dur) var(--ease),
              visibility 0s 0s;  /* no delay when becoming visible */
}

#nav-main ul.nav-list li ul.dropdown-menu li a {
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: .85rem;
}

/* Third-level */
#nav-main ul.nav-list li ul.dropdown-menu li ul.dropdown-menu {
  top: -6px;
  left: calc(100% + 4px);
}

/* ── Mobile expand button ──
   Hidden on desktop; shown on mobile where :hover is unreliable.
   Positioned inside the <li> so it doesn't interfere with the link. ── */
.dropdown-toggle {
  display: none;  /* hidden by default — shown only inside mobile breakpoint */
}

/* ── Inline search form ── */
.nav-search {
  display: flex;
  align-items: center;
  background: var(--bg-input);
  border: 2px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 5px 5px 5px 18px;
  flex-shrink: 0;
  transition: border-color var(--dur), box-shadow var(--dur);
}
/* Focus ring on the search wrapper (WCAG 2.4.7) */
.nav-search:focus-within {
  border-color: var(--clr-accent-1);
  box-shadow: var(--focus-ring);
  outline: none;
}

.nav-search input[type="search"] {
  background: transparent;
  border: none;
  outline: none;
  font-family: var(--font-body);
  font-size: .95rem;
  color: var(--txt-primary);
  width: 180px;
  padding: 4px 0;
}
.nav-search input[type="search"]:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-xs);
}
.nav-search input[type="search"]::placeholder { color: var(--txt-muted); }

.nav-search button {
  background: var(--grad-brand-btn);
  border: none;
  border-radius: var(--radius-pill);
  color: #fff;
  cursor: pointer;
  padding: 8px 18px;
  font-family: var(--font-body);
  font-size: .875rem;
  font-weight: 700;
  line-height: 1.4;
  transition: opacity var(--dur);
}
.nav-search button:hover { opacity: .85; }
.nav-search button:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* ── Social icons ── */
.topmenu-social-wrap { display: flex; align-items: center; gap: 6px; flex-shrink: 0; list-style: none; margin: 0; padding: 0; }

.topmenu-social {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  font-size: 1.1rem;
  color: var(--txt-secondary);
  transition: background var(--dur), color var(--dur), transform var(--dur) var(--ease);
  text-decoration: none;
}
.topmenu-social:hover {
  background: var(--grad-brand);
  color: #fff;
  transform: scale(1.12);
}
.topmenu-social:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* ── Custom inline SVG icons (Substack, Open Library)
   Sized to 1em so they scale with the .topmenu-social font-size (1.1rem).
   currentColor and pointer-events inherited from the parent <a>. ── */
.topmenu-social svg {
  width: 1em;
  height: 1em;
  fill: currentColor;
  stroke: currentColor; /* worldcat-style stroke icons also respect this */
  pointer-events: none;
  flex-shrink: 0;
}

/* ── Dark-mode toggle ── */
#dark-mode-toggle {
  background: none;
  border: 2px solid var(--border);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  cursor: pointer;
  color: var(--txt-secondary);
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: border-color var(--dur), color var(--dur), transform var(--dur) var(--ease);
}
#dark-mode-toggle:hover {
  border-color: var(--clr-accent-1);
  color: var(--clr-accent-1);
  transform: rotate(22deg) scale(1.1);
}
#dark-mode-toggle:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-color: transparent;
}

/* ── Mobile hamburger ── */
.navbar-toggle {
  display: none;
  background: none;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 9px;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  margin-left: auto;
  flex-shrink: 0;
}
.navbar-toggle .icon-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--txt-primary);
  border-radius: 2px;
  transition: transform var(--dur), opacity var(--dur);
}
.navbar-toggle[aria-expanded="true"] .icon-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.navbar-toggle[aria-expanded="true"] .icon-bar:nth-child(2) { opacity: 0; }
.navbar-toggle[aria-expanded="true"] .icon-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Subpage title ── */
.subpage-title {
  max-width: var(--max-grid);
  margin: 28px auto 0;
  padding: 0 24px;
  text-align: center;
}
.subpage-title h1 {
  font-size: clamp(1.4rem, 3vw, 2.4rem);
  background: var(--grad-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  padding-bottom: .35em;
}
.subpage-title p { color: var(--txt-secondary); font-size: .95rem; }

/* ── Responsive ── */
@media (max-width: 860px) {
  .navbar-toggle { display: flex; }

  #nav-main {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    background: var(--bg-nav);
    flex-direction: column;
    align-items: stretch;
    padding: 20px;
    gap: 12px;
    box-shadow: var(--shadow-md);
    border-bottom: 1px solid var(--border);
    z-index: 999;
  }
  #nav-main.open { display: flex; }
  #nav-main ul.nav-list { flex-direction: column; align-items: stretch; }

  /* On mobile, dropdowns are controlled by JS (.dropdown-open class on the <li>).
     :hover/:focus-within still work as a fallback for keyboard-only users. */
  #nav-main ul.nav-list li ul.dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    border-left: 2px solid var(--border);
    border-radius: 0;
    padding: 0 0 0 14px;
    /* Override the transition-based show/hide with display for mobile
       so there's no layout gap when the item is hidden. */
    display: none;
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
    transform: none;
    transition: none;
  }
  #nav-main ul.nav-list li:hover > ul.dropdown-menu,
  #nav-main ul.nav-list li:focus-within > ul.dropdown-menu,
  #nav-main ul.nav-list li.dropdown-open > ul.dropdown-menu { display: flex; }

  /* Third-level on mobile: same treatment as first-level */
  #nav-main ul.nav-list li ul.dropdown-menu li ul.dropdown-menu {
    position: static;
    border-left: 2px solid var(--border);
    border-radius: 0;
    top: auto;
    left: auto;
    box-shadow: none;
    padding: 0 0 0 14px;
    margin-top: 2px;
  }

  /* ── Mobile expand button ── */
  /* Show the toggle button; position it at the right edge of the <li> */
  #nav-main ul.nav-list > li { position: relative; }

  .dropdown-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: 0; right: 0;
    width: 44px;
    height: 44px;
    background: none;
    border: none;
    color: var(--txt-secondary);
    cursor: pointer;
    font-size: .75rem;
    transition: color var(--dur), transform var(--dur);
  }
  .dropdown-toggle:hover { color: var(--clr-accent-1); }
  .dropdown-toggle:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
    border-radius: var(--radius-xs);
  }
  /* Rotate chevron when expanded */
  li.dropdown-open > .dropdown-toggle { transform: rotate(180deg); }
  li.dropdown-open > .dropdown-toggle { color: var(--clr-accent-1); }

  /* Shrink the parent link so it doesn't overlap the toggle button */
  #nav-main ul.nav-list > li.has-dropdown > a { padding-right: 48px; }

  .nav-search { width: 100%; }
  .nav-search input[type="search"] { width: 100%; flex: 1; }
  .topmenu-social-wrap { justify-content: flex-start; }
}

/* =============================================================
   FOOTER NAVIGATION
   Flat single-level link strip rendered above the copyright line.
   Absent when no 'footer_nav' menu is assigned in Appearance → Menus.
   ============================================================= */
.footer-nav {
  display: flex;
  justify-content: center;
  padding: 24px 24px 0;
  border-top: 1px solid rgba(255,255,255,.12);
  margin-bottom: 16px;
}

.footer-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px 0;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-nav__list li a {
  display: block;
  padding: 6px 14px;
  font-size: .85rem;
  font-weight: 600;
  color: rgba(255,255,255,.65);
  text-decoration: none;
  border-radius: var(--radius-pill);
  transition: background var(--dur), color var(--dur);
}
.footer-nav__list li a:hover {
  background: rgba(255,255,255,.10);
  color: #fff;
}
.footer-nav__list li a:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(255,255,255,.2), 0 0 0 5px rgba(255,255,255,.6);
}

/* Active/current page link */
.footer-nav__list li.active > a,
.footer-nav__list li a[aria-current="page"] {
  color: #fff;
  background: rgba(255,255,255,.12);
}

@media (max-width: 600px) {
  .footer-nav { padding-top: 20px; }
  .footer-nav__list { gap: 2px 0; }
  .footer-nav__list li a { font-size: .8rem; padding: 5px 10px; }

  /* ── Nav bar compaction ─────────────────────────────────
     At 320 px the 40 px side padding leaves only 240 px for
     logo + gap + hamburger.  Reduce padding and logo height
     so the bar never overflows even on the smallest phones.  */
  .nav-inner {
    padding: 0 16px;
    gap: 12px;
  }

  .navbar-brand { font-size: 1.3rem; }

  /* Logo image — scale down to sit comfortably inside 64 px nav */
  .navbar-brand--logo .custom-logo-link img,
  .navbar-brand img { height: 36px; }
}