/* =====================================================================
   Project BlueStik · Liquid Glass theme
   --------------------------------------------------------------------
   Implementation per kube.io's Apple Liquid Glass analysis:

   1) feTurbulence creates a soft fractal noise (R/G channels encode
      X/Y displacement vectors).
   2) feGaussianBlur smooths the noise so displacement is gentle, not
      grainy.
   3) feDisplacementMap takes the noise as a vector field and bends
      every pixel of the backdrop accordingly — true light refraction
      simulated in 2D.
   4) backdrop-filter: url(#filter) applies it to whatever is behind
      the glass surface (animated color blobs in our case).

   Edge highlight + bottom shadow done via inset box-shadow (cheap,
   GPU-friendly), giving the rim-light look of curved glass.

   Mobile: displacement is dropped (only blur+saturate) — feDisplace-
   mentMap is GPU-expensive and overkill on small screens.
   ===================================================================== */

[data-theme="glass"] {
  --glass-fill: rgba(15, 18, 32, 0.42);
  --glass-fill-strong: rgba(15, 18, 32, 0.62);
  --glass-edge: rgba(255, 255, 255, 0.22);
  --glass-edge-bright: rgba(255, 255, 255, 0.42);
  --glass-shadow:
    inset 0 1.4px 0 rgba(255, 255, 255, 0.42),
    inset 0 -1px 0 rgba(0, 0, 0, 0.18),
    inset 1px 0 0 rgba(255, 255, 255, 0.10),
    inset -1px 0 0 rgba(255, 255, 255, 0.06),
    0 14px 44px rgba(0, 0, 0, 0.40),
    0 2px 8px rgba(0, 0, 0, 0.25);
  --glass-shadow-hover:
    inset 0 1.6px 0 rgba(255, 255, 255, 0.55),
    inset 0 -1px 0 rgba(0, 0, 0, 0.18),
    inset 1px 0 0 rgba(255, 255, 255, 0.14),
    inset -1px 0 0 rgba(255, 255, 255, 0.08),
    0 22px 60px rgba(0, 0, 0, 0.45),
    0 4px 14px rgba(155, 200, 255, 0.14);

  --ink-1: #ecedf2;
  --ink-2: #c0c3cf;
  --ink-3: #909aae;
}

/* SVG filter defs container (kept invisible) */
.lg-defs {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
  pointer-events: none;
}

/* ===== Background: animated color blobs ===== */
[data-theme="glass"] body {
  background: #0a0d18;
  position: relative;
  overflow-x: hidden;
}

[data-theme="glass"] body::after {
  content: "";
  position: fixed;
  inset: -10vh -10vw;
  z-index: -2;
  background:
    radial-gradient(ellipse 50% 40% at 18% 22%, #4a90ff 0%, transparent 60%),
    radial-gradient(ellipse 45% 50% at 82% 28%, #c264ff 0%, transparent 60%),
    radial-gradient(ellipse 55% 45% at 25% 80%, #ff6b9d 0%, transparent 60%),
    radial-gradient(ellipse 40% 50% at 75% 78%, #5fffd6 0%, transparent 60%);
  filter: saturate(140%) blur(40px);
  animation: glass-orbs 32s ease-in-out infinite;
  will-change: transform;
}
@keyframes glass-orbs {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  33%      { transform: translate3d(3%, -2%, 0) scale(1.06); }
  66%      { transform: translate3d(-2%, 3%, 0) scale(1.03); }
}

@media (prefers-reduced-motion: reduce) {
  [data-theme="glass"] body::after { animation: none; }
}

/* ===== Glass panels (base — solid frosted card) ===== */
[data-theme="glass"] .nav,
[data-theme="glass"] .toolbar,
[data-theme="glass"] .specimen-card,
[data-theme="glass"] .mosaic__cell,
[data-theme="glass"] .specimen__plate,
[data-theme="glass"] .hero__stage,
[data-theme="glass"] .lightbox__panel,
[data-theme="glass"] .lightbox__image-wrap,
[data-theme="glass"] .callout,
[data-theme="glass"] .source-card,
[data-theme="glass"] .about__toc,
[data-theme="glass"] .gate__form,
[data-theme="glass"] .theme-panel,
[data-theme="glass"] .theme-toggle,
[data-theme="glass"] .footer {
  background: var(--glass-fill);
  border: 1px solid var(--glass-edge);
  box-shadow: var(--glass-shadow);
  border-radius: 18px;
  transition:
    border-color 280ms var(--ease-out),
    box-shadow 320ms var(--ease-out);
}

[data-theme="glass"] .footer { border-radius: 0; border-left: 0; border-right: 0; border-bottom: 0; }
[data-theme="glass"] .nav { border-radius: 0 0 18px 18px; border-top: 0; }

/* ===== Liquid Glass: SVG-displaced backdrop on desktop ===== */
@media (min-width: 721px) {
  /* Strong refraction on big surfaces */
  [data-theme="glass"] .nav,
  [data-theme="glass"] .hero__stage,
  [data-theme="glass"] .specimen__plate,
  [data-theme="glass"] .lightbox__panel,
  [data-theme="glass"] .lightbox__image-wrap,
  [data-theme="glass"] .about__toc,
  [data-theme="glass"] .gate__form,
  [data-theme="glass"] .theme-panel,
  [data-theme="glass"] .source-card,
  [data-theme="glass"] .callout,
  [data-theme="glass"] .footer {
    backdrop-filter: url(#lg-distort) blur(2px) saturate(180%) brightness(1.06);
    -webkit-backdrop-filter: blur(28px) saturate(180%) brightness(1.05);
  }

  /* Lighter refraction on photo cards (many of them — keep cheap) */
  [data-theme="glass"] .specimen-card,
  [data-theme="glass"] .mosaic__cell,
  [data-theme="glass"] .toolbar,
  [data-theme="glass"] .theme-toggle {
    backdrop-filter: url(#lg-distort-soft) blur(1.5px) saturate(170%);
    -webkit-backdrop-filter: blur(20px) saturate(170%);
  }
}

/* Mobile + reduced-motion: drop displacement, keep blur */
@media (max-width: 720px),
       (prefers-reduced-motion: reduce) {
  [data-theme="glass"] .nav,
  [data-theme="glass"] .hero__stage,
  [data-theme="glass"] .specimen__plate,
  [data-theme="glass"] .lightbox__panel,
  [data-theme="glass"] .lightbox__image-wrap,
  [data-theme="glass"] .about__toc,
  [data-theme="glass"] .gate__form,
  [data-theme="glass"] .theme-panel,
  [data-theme="glass"] .source-card,
  [data-theme="glass"] .callout,
  [data-theme="glass"] .footer,
  [data-theme="glass"] .specimen-card,
  [data-theme="glass"] .mosaic__cell,
  [data-theme="glass"] .toolbar,
  [data-theme="glass"] .theme-toggle {
    backdrop-filter: blur(22px) saturate(170%);
    -webkit-backdrop-filter: blur(22px) saturate(170%);
  }
}

/* Mobile drawer (hamburger) — solid frosted card */
@media (max-width: 720px) {
  [data-theme="glass"] .nav__links {
    background: rgba(18, 21, 36, 0.96);
    backdrop-filter: blur(28px) saturate(180%);
    -webkit-backdrop-filter: blur(28px) saturate(180%);
    border: 1px solid var(--glass-edge);
    box-shadow: var(--glass-shadow);
    border-radius: 14px;
  }
  [data-theme="glass"] .nav__links.is-open {
    animation: glass-drawer-in 220ms var(--ease-out) both;
  }
  @keyframes glass-drawer-in {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
  }
  @media (prefers-reduced-motion: reduce) {
    [data-theme="glass"] .nav__links.is-open { animation: none; }
  }
  [data-theme="glass"] .nav__links .nav__link {
    transition: background-color 180ms var(--ease-out), color 180ms var(--ease-out);
    border-radius: 8px;
  }
  [data-theme="glass"] .nav__links .nav__link:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--ink-0);
  }
}

/* TOC: real padding so content doesn't touch glass edges */
[data-theme="glass"] .about__toc {
  padding: 20px 22px;
}

/* ===== Cards: smooth hover lift with bigger glow ===== */
[data-theme="glass"] .specimen-card,
[data-theme="glass"] .mosaic__cell {
  transition:
    transform 320ms var(--ease-out),
    border-color 240ms var(--ease-out),
    box-shadow 320ms var(--ease-out);
  will-change: transform;
}
[data-theme="glass"] .specimen-card:hover,
[data-theme="glass"] .mosaic__cell:hover {
  border-color: var(--glass-edge-bright);
  transform: translateY(-3px);
  box-shadow: var(--glass-shadow-hover);
}

/* ===== Buttons — frosted glass pills with smooth feedback ===== */
[data-theme="glass"] .btn--primary,
[data-theme="glass"] .btn--ghost,
[data-theme="glass"] .nav__cta {
  border-radius: 999px;
  transition:
    background-color 240ms var(--ease-out),
    transform 220ms var(--ease-spring),
    box-shadow 240ms var(--ease-out),
    border-color 240ms var(--ease-out);
}

[data-theme="glass"] .btn--primary {
  background: rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.30);
  color: #ffffff;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.50),
    inset 0 -1px 0 rgba(0, 0, 0, 0.10),
    0 4px 14px rgba(0, 0, 0, 0.25);
  padding: 11px 22px;
}
[data-theme="glass"] .btn--primary:hover {
  background: rgba(255, 255, 255, 0.28);
  transform: translateY(-1px);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.55),
    0 8px 22px rgba(0, 0, 0, 0.32);
}
[data-theme="glass"] .btn--primary:active {
  transform: translateY(0) scale(0.98);
  transition-duration: 90ms;
}

[data-theme="glass"] .btn--ghost {
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.18);
}
[data-theme="glass"] .btn--ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.28);
  transform: translateY(-1px);
}
[data-theme="glass"] .btn--ghost:active {
  transform: translateY(0) scale(0.98);
  transition-duration: 90ms;
}

[data-theme="glass"] .nav__cta {
  background: rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.28);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4);
  color: #fff;
}
[data-theme="glass"] .nav__cta:hover { background: rgba(255, 255, 255, 0.24); transform: translateY(-1px); }
[data-theme="glass"] .nav__cta:active { transform: translateY(0) scale(0.98); transition-duration: 90ms; }

/* Toolbar chips — pill-shaped frosted */
[data-theme="glass"] .toolbar__filter-group,
[data-theme="glass"] .toolbar__view {
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-radius: 999px;
  border-color: rgba(255, 255, 255, 0.14);
}
[data-theme="glass"] .toolbar__chip {
  border-radius: 999px;
  transition: background-color 200ms var(--ease-out), color 200ms var(--ease-out);
}
[data-theme="glass"] .toolbar__chip.is-active { background: rgba(255, 255, 255, 0.18); }
[data-theme="glass"] .toolbar__view button {
  transition: background-color 200ms var(--ease-out), color 200ms var(--ease-out);
}
[data-theme="glass"] .toolbar__search input {
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-radius: 999px;
  transition: background-color 200ms var(--ease-out), border-color 200ms var(--ease-out);
}
[data-theme="glass"] .toolbar__search input:focus {
  background: rgba(255, 255, 255, 0.10);
}

/* ===== Hero title — gradient with subtle shift ===== */
[data-theme="glass"] .hero__title {
  color: #ffffff;
  text-shadow: 0 2px 30px rgba(255, 255, 255, 0.12);
}
[data-theme="glass"] .hero__title span {
  background: linear-gradient(110deg, #b9d8ff 0%, #c264ff 40%, #ff9bd0 70%, #b9d8ff 100%);
  background-size: 220% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 14px rgba(194, 100, 255, 0.35));
  animation: glass-title-shift 14s ease-in-out infinite;
}
@keyframes glass-title-shift {
  0%, 100% { background-position: 0% 50%; }
  50%      { background-position: 100% 50%; }
}
@media (prefers-reduced-motion: reduce) {
  [data-theme="glass"] .hero__title span { animation: none; }
}

/* Brand sigil — gentle glow pulse */
[data-theme="glass"] .brand__sigil {
  background: linear-gradient(135deg, #88b8ff, #c264ff);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.5),
    0 2px 8px rgba(136, 184, 255, 0.4);
  animation: glass-sigil 4s ease-in-out infinite;
}
@keyframes glass-sigil {
  0%, 100% { box-shadow: inset 0 1px 0 rgba(255,255,255,0.5), 0 2px 8px rgba(136,184,255,0.40); }
  50%      { box-shadow: inset 0 1px 0 rgba(255,255,255,0.5), 0 4px 16px rgba(136,184,255,0.55); }
}
@media (prefers-reduced-motion: reduce) {
  [data-theme="glass"] .brand__sigil { animation: none; }
}

/* Brand sigil hover punch */
[data-theme="glass"] .brand:hover .brand__sigil {
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.6),
    0 4px 18px rgba(194, 100, 255, 0.55);
}

/* Nav links smooth color transition */
[data-theme="glass"] .nav__link {
  transition: color 200ms var(--ease-out);
}
[data-theme="glass"] .nav__link:hover { color: var(--ink-0); }

/* About: section dividers softer */
[data-theme="glass"] .rec__head { border-bottom-color: rgba(255, 255, 255, 0.12); }
[data-theme="glass"] .deflist__row { border-bottom-color: rgba(255, 255, 255, 0.08); }

/* TOC link smooth color transition */
[data-theme="glass"] .about__toc a {
  color: #d6d9e2;
  transition: color 180ms var(--ease-out);
}
[data-theme="glass"] .about__toc a:hover { color: #ffffff; }
[data-theme="glass"] .about__toc li::before { color: #b8bccb; }

/* Small mono text — text-shadow for legibility against vibrant blobs */
[data-theme="glass"] .about__meta,
[data-theme="glass"] .about__toc-title,
[data-theme="glass"] .rec__num,
[data-theme="glass"] .rec__sub,
[data-theme="glass"] .footer__credits,
[data-theme="glass"] .footer__bar,
[data-theme="glass"] .hero__stage-counter,
[data-theme="glass"] .specimen__counter,
[data-theme="glass"] .specimen__crumbs,
[data-theme="glass"] .lightbox__counter,
[data-theme="glass"] .deflist__term-en,
[data-theme="glass"] .archive-head__hint,
[data-theme="glass"] .result-count,
[data-theme="glass"] .specimen-card__id,
[data-theme="glass"] .hero__stage-id,
[data-theme="glass"] .specimen__plate-stamp,
[data-theme="glass"] .chip,
[data-theme="glass"] .chain__step {
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

/* Theme panel cards — smooth hover */
[data-theme="glass"] .theme-card {
  transition: background-color 200ms var(--ease-out), border-color 200ms var(--ease-out), color 200ms var(--ease-out);
}
[data-theme="glass"] .theme-toggle {
  transition: transform 240ms var(--ease-spring), border-color 200ms var(--ease-out), color 200ms var(--ease-out);
}
[data-theme="glass"] .theme-toggle:hover { transform: translateY(-2px); }

/* Gentle page fade-in on first load */
@keyframes glass-page-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}
[data-theme="glass"] body {
  animation: glass-page-in 360ms var(--ease-out) both;
}
@media (prefers-reduced-motion: reduce) {
  [data-theme="glass"] body { animation: none; }
}

/* Specimen prev/next nav — smooth lift */
[data-theme="glass"] .specimen__nav-link {
  background: var(--glass-fill);
  border-color: var(--glass-edge);
  border-radius: 14px;
  transition:
    transform 280ms var(--ease-out),
    border-color 240ms var(--ease-out),
    background-color 240ms var(--ease-out);
}
@media (min-width: 721px) {
  [data-theme="glass"] .specimen__nav-link {
    backdrop-filter: url(#lg-distort-soft) blur(1.5px) saturate(170%);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
  }
}
@media (max-width: 720px) {
  [data-theme="glass"] .specimen__nav-link {
    backdrop-filter: blur(20px) saturate(160%);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
  }
}
[data-theme="glass"] .specimen__nav-link:hover {
  border-color: var(--glass-edge-bright);
  background: var(--glass-fill-strong);
  transform: translateY(-2px);
}

/* Lightbox: smooth nav button hover */
[data-theme="glass"] .lightbox__close,
[data-theme="glass"] .lightbox__nav {
  background: var(--glass-fill);
  border-color: var(--glass-edge);
  transition:
    background-color 200ms var(--ease-out),
    border-color 200ms var(--ease-out),
    transform 200ms var(--ease-out);
}
@media (min-width: 721px) {
  [data-theme="glass"] .lightbox__close,
  [data-theme="glass"] .lightbox__nav {
    backdrop-filter: blur(18px) saturate(180%);
    -webkit-backdrop-filter: blur(18px) saturate(180%);
  }
}
[data-theme="glass"] .lightbox__close:hover,
[data-theme="glass"] .lightbox__nav:hover {
  background: var(--glass-fill-strong);
  transform: scale(1.06);
}

/* Chain steps (qarning) — soft */
[data-theme="glass"] .chain__step {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.12);
}
[data-theme="glass"] .chain__step--peak {
  color: var(--stik-300);
  border-color: rgba(185, 216, 255, 0.40);
  background: rgba(136, 184, 255, 0.10);
}

/* Firefox fallback: backdrop-filter url() not supported,
   use plain blur+saturate everywhere */
@-moz-document url-prefix() {
  [data-theme="glass"] .nav,
  [data-theme="glass"] .hero__stage,
  [data-theme="glass"] .specimen__plate,
  [data-theme="glass"] .lightbox__panel,
  [data-theme="glass"] .lightbox__image-wrap,
  [data-theme="glass"] .about__toc,
  [data-theme="glass"] .gate__form,
  [data-theme="glass"] .theme-panel,
  [data-theme="glass"] .source-card,
  [data-theme="glass"] .callout,
  [data-theme="glass"] .footer,
  [data-theme="glass"] .specimen-card,
  [data-theme="glass"] .mosaic__cell,
  [data-theme="glass"] .toolbar,
  [data-theme="glass"] .theme-toggle,
  [data-theme="glass"] .specimen__nav-link {
    backdrop-filter: blur(22px) saturate(170%);
  }
}