/* ===== LAYOUT: NAV + FOOTER ===== */

/* ---- NAV ---- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 1rem 0;
  /* (2026-07-05) Raised from 0.7 -> 0.96: on light themes (Dawn), enough of the page
     background bled through the translucency to lighten the effective nav bar to a
     medium gray, breaking contrast for --nav-muted/--nav-text sized for a dark backdrop.
     0.96 fixes this on flat-background pages. KNOWN REMAINING EDGE CASE (see
     TODO/design/TODO_ui.md): on pages with a colored/gradient hero directly behind the
     fixed nav (e.g. sleep.html), the blend can still land somewhere lighter than
     assumed — verified via axe-core that sleep.html's nav still under-contrasts even at
     0.96. A fully opaque background would guarantee this everywhere but removes the
     glass/blur effect entirely (nothing shows through backdrop-filter at opacity 1) —
     that's a design tradeoff for a human to weigh in on, not applied here. */
  background: rgba(10, 10, 18, 0.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), transform 0.3s ease;
}
.nav--hidden { transform: translateY(-100%); }

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.nav__logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--nav-text);
  letter-spacing: 0.08em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav__logo span { color: var(--nav-accent); }

.nav__logo-3d {
  width: 28px;
  height: 28px;
  display: block;
  flex-shrink: 0;
}

.nav__links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
  align-items: center;
}

.nav__links a {
  color: var(--nav-muted);
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color var(--transition);
  position: relative;
}

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 100%;
  height: 1px;
  background: var(--accent);
  transition: right var(--transition);
}

.nav__links a:hover,
.nav__links a.active {
  color: var(--nav-text);
}

.nav__links a:hover::after,
.nav__links a.active::after {
  right: 0;
}

/* regular nav links spacing */
.nav__links > li > a {
  padding: 0.35rem 0.6rem;
  display: block;
}

/* ---- DROPDOWN NAV ---- */
.nav__dropdown {
  position: relative;
}

.nav__drop-btn {
  background: none;
  border: none;
  color: var(--nav-muted);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.35rem 0.6rem;
  transition: color var(--transition);
  white-space: nowrap;
}
.nav__drop-btn:hover,
.nav__drop-btn.active {
  color: var(--nav-text);
}
.nav__drop-btn.active::after {
  /* underline indicator for active dropdown group */
  content: '';
  position: absolute;
  bottom: -4px; left: 0.6rem; right: 0.6rem;
  height: 1px;
  background: var(--accent);
}

.nav__caret {
  font-size: 0.6rem;
  transition: transform 0.2s;
  display: inline-block;
}
.nav__dropdown.open > .nav__drop-btn .nav__caret,
.nav__drop-btn[aria-expanded="true"] .nav__caret {
  transform: rotate(180deg);
}

.nav__submenu {
  display: none;
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%);
  background: rgba(12, 12, 22, 0.97);
  border: 1px solid rgba(139, 124, 248, 0.18);
  border-radius: 12px;
  padding: 0.5rem;
  min-width: 130px;
  list-style: none;
  z-index: 200;
  backdrop-filter: blur(16px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  animation: dropIn 0.15s ease;
}

@keyframes dropIn {
  from { opacity: 0; transform: translateX(-50%) translateY(-6px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

.nav__dropdown.open > .nav__submenu,
.nav__drop-btn[aria-expanded="true"] + .nav__submenu {
  display: block;
}

.nav__submenu li a {
  display: block;
  padding: 0.42rem 0.8rem;
  color: var(--nav-muted);
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 8px;
  transition: background 0.15s, color 0.15s;
}
.nav__submenu li a::after { display: none; }
.nav__submenu li a:hover,
.nav__submenu li a.active {
  background: rgba(139, 124, 248, 0.12);
  color: var(--nav-accent);
}

/* ---- THEME PICKER (injected by js/theme.js as a standard nav dropdown) ---- */
.theme-picker__swatch {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 1px solid transparent;
  flex-shrink: 0;
  display: inline-block;
}
.nav__drop-btn .theme-picker__swatch { margin-right: 0.35rem; }

.nav__submenu--theme { min-width: 160px; }

.theme-option {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  width: 100%;
  padding: 0.42rem 0.8rem;
  background: none;
  border: none;
  border-radius: 8px;
  color: var(--nav-muted);
  font-size: 0.82rem;
  font-family: var(--font-sans);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.theme-option:hover,
.theme-option.active {
  background: rgba(139, 124, 248, 0.12);
  color: var(--nav-accent);
}
.theme-option.active .theme-picker__swatch {
  border-color: currentColor;
  box-shadow: 0 0 0 1px currentColor;
}

/* ---- MOBILE: dropdowns inline ---- */
@media (max-width: 700px) {
  .nav__drop-btn {
    width: 100%;
    justify-content: center;
    padding: 0.8rem;
  }
  .nav__submenu {
    position: static;
    transform: none;
    background: rgba(139, 124, 248, 0.05);
    border: none;
    border-radius: 0;
    padding: 0;
    box-shadow: none;
    animation: none;
  }
  .nav__submenu li a { padding: 0.65rem 1rem; }
}

/* hamburger (mobile) */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  cursor: pointer;
}
.nav__toggle span {
  display: block;
  width: 22px; height: 2px;
  background: var(--nav-text);
  border-radius: 1px;
  transition: var(--transition);
}

@media (max-width: 700px) {
  .nav__toggle { display: flex; }
  .nav__links {
    position: fixed;
    top: 61px; left: 0; right: 0;
    background: rgba(10, 10, 18, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: 1.5rem 0 2rem;
    transform: translateY(-110%);
    transition: transform var(--transition);
  }
  .nav__links.open { transform: translateY(0); }
  .nav__links li { width: 100%; text-align: center; }
  .nav__links a  { display: block; padding: 0.8rem; }
}

/* ---- PAGE HEADER ---- */
.page-header {
  padding: 9rem 0 4rem;
  text-align: center;
  position: relative;
}

.page-header__tag {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(139, 124, 248, 0.3);
  border-radius: 100px;
  padding: 0.3rem 1rem;
  margin-bottom: 1.2rem;
}

.page-header p {
  max-width: 520px;
  margin: 1rem auto 0;
  font-size: 1rem;
  color: var(--muted);
}

/* ---- FOOTER ---- */
.footer {
  border-top: 1px solid var(--border);
  padding: 3rem 0 2rem;
  text-align: center;
}

.footer__logo {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  color: var(--muted);
  letter-spacing: 0.08em;
  margin-bottom: 0.8rem;
}
.footer__logo span { color: var(--accent); }

.footer__links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  list-style: none;
  margin-bottom: 1.5rem;
}

.footer__links a {
  color: var(--muted);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.footer__copy {
  font-size: 0.78rem;
  color: var(--muted);
  /* (2026-07-05) opacity:0.6 removed — --muted is already WCAG-AA-tuned per theme
     against --bg/--surface; stacking opacity on top undid that tuning and failed
     axe-core color-contrast on every page (found via automated audit). */
}

/* ===== FOOTER SITEMAP (comprehensive site link footer) ===== */
.footer-sitemap {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 3rem 1.5rem 2rem;
  color: var(--muted);
  margin-top: 4rem;
}
.footer-sitemap__inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}
.footer-sitemap__col h4 {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--text);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin: 0 0 0.9rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}
.footer-sitemap__col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.footer-sitemap__col a {
  color: var(--muted);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: color var(--transition);
}
.footer-sitemap__col a:hover,
.footer-sitemap__col a:focus-visible {
  color: var(--accent);
}
.footer-sitemap__bottom {
  max-width: 1200px;
  margin: 2rem auto 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.78rem;
  color: var(--muted);
  /* (2026-07-05) opacity:0.75 removed — same WCAG-contrast bug as .footer__copy above. */
}
.footer-sitemap__bottom a {
  color: var(--muted);
  text-decoration: none;
  transition: color var(--transition);
}
.footer-sitemap__bottom a:hover {
  color: var(--accent);
}
@media (max-width: 720px) {
  .footer-sitemap__inner { grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
}
@media (max-width: 480px) {
  .footer-sitemap__inner { grid-template-columns: 1fr; gap: 1.25rem; }
  .footer-sitemap { padding: 2rem 1.25rem 1.5rem; }
}

/* ===== SAFE AREA INSETS — iOS notch / Dynamic Island ===== */
@supports (padding: env(safe-area-inset-top)) {
  .nav {
    padding-top: calc(1rem + env(safe-area-inset-top));
  }
  .footer {
    padding-bottom: calc(2rem + env(safe-area-inset-bottom));
  }
  body {
    padding-left:  env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
  }
}

/* Tablet 2-col enhancement (768-1024px) */
@media (min-width: 768px) and (max-width: 1023px) {
  /* Sound/visual/meditation/breathing cards — 2 col tablet sweet spot */
  .sound-grid, .visual-grid, .med-grid, .breath-grid, .preset-grid,
  .mood-grid, .challenge-grid, .related-grid__list,
  .hub-spokes__grid, .recent-added__list {
    grid-template-columns: repeat(2, 1fr) !important;
  }
  /* Footer sitemap: 2 cols on tablet (was 4 col desktop / 1 col mobile) */
  .footer-sitemap__inner {
    grid-template-columns: repeat(2, 1fr) !important;
  }
  /* Compare-table: ensure horizontal scroll for narrow tablet */
  .compare-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
    max-width: 100%;
  }
  .compare-table th, .compare-table td {
    white-space: normal;
  }
  /* Main content: comfortable reading width on tablet */
  main, .container {
    max-width: 720px;
    padding-inline: 1.25rem;
  }
}

/* ===== ANIMATED NAV TRANSITIONS (task 5) =====
   Subtle slide/fade for the mobile nav drawer and desktop dropdown submenus.
   Replaces the abrupt display:none toggle with an opacity+transform reveal,
   while preserving the existing open-state hooks (.open / aria-expanded).
   All motion is disabled under prefers-reduced-motion.
*/
@media (prefers-reduced-motion: no-preference) {
  /* Desktop dropdown submenu: render but stay invisible/non-interactive,
     then fade+slide in on open. Keeps the .open / aria-expanded hooks. */
  .nav__submenu {
    display: block;
    opacity: 0;
    transform: translateX(-50%) translateY(-8px);
    pointer-events: none;
    visibility: hidden;
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0s linear 0.2s;
    animation: none; /* supersede the legacy dropIn keyframe */
  }
  .nav__dropdown.open > .nav__submenu,
  .nav__drop-btn[aria-expanded="true"] + .nav__submenu {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
    visibility: visible;
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0s;
  }

  /* Mobile drawer (.nav__links): give the existing slide a springier curve
     and fade the link items in with a slight stagger. */
  @media (max-width: 700px) {
    .nav__links {
      transition: transform 0.4s cubic-bezier(0.34, 1.2, 0.64, 1), opacity 0.3s ease;
      opacity: 0;
    }
    .nav__links.open { opacity: 1; }
    .nav__links li {
      opacity: 0;
      transform: translateY(8px);
      transition: opacity 0.3s ease, transform 0.3s ease;
    }
    .nav__links.open li {
      opacity: 1;
      transform: none;
    }
    .nav__links.open li:nth-child(1) { transition-delay: 0.05s; }
    .nav__links.open li:nth-child(2) { transition-delay: 0.09s; }
    .nav__links.open li:nth-child(3) { transition-delay: 0.13s; }
    .nav__links.open li:nth-child(4) { transition-delay: 0.17s; }
    .nav__links.open li:nth-child(5) { transition-delay: 0.21s; }
    .nav__links.open li:nth-child(n+6) { transition-delay: 0.25s; }

    /* On mobile the submenu is static (inline) — keep it simple, no transform */
    .nav__submenu {
      transform: none;
      visibility: visible;
      opacity: 1;
      pointer-events: auto;
    }
  }
}

/* Landscape phone optimization (under 500px height) */
@media (max-height: 500px) and (orientation: landscape) {
  .nav { padding-block: 0.25rem; }
  .page-header { padding-block: 1rem; }
  .hero { min-height: auto !important; }
  /* Hide the recently-added widget on landscape mobile (saves vertical space) */
  .recent-added { display: none; }
}