/* ==========================================================================
   Cognitive Bias Atlas — main.css
   Navigation, hero, cards, category pages, research, references, footer
   ========================================================================== */

/* ---------- Background video ------------------------------------------ */
/* Decorative full-screen video mounted by assets/js/background.js. Lives at
   the very back of the stacking order; the dark scrim, blobs and grid all sit
   above it (see tokens.css .backdrop / .blob / .noise-layer). */
.bg-video {
  position: fixed;
  inset: 0;
  z-index: -5;
  overflow: hidden;
  background: var(--bg-0);
  pointer-events: none;
}
.bg-video video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.bg-video.is-blocked { background: var(--bg-0); }

/* ---------- Navigation ------------------------------------------------ */

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background var(--dur-n) var(--ease), border-color var(--dur-n) var(--ease), box-shadow var(--dur-n) var(--ease);
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: rgba(8, 8, 18, 0.55);
  -webkit-backdrop-filter: blur(var(--blur-md)) saturate(var(--saturate));
  backdrop-filter: blur(var(--blur-md)) saturate(var(--saturate));
  border-bottom-color: var(--glass-border);
  box-shadow: var(--sh-sm);
}

.nav-inner {
  width: min(1240px, 94vw);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.06rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.brand-dot {
  width: 26px; height: 26px;
  border-radius: 9px;
  background: conic-gradient(from 210deg, var(--c1), var(--c2), var(--c3), var(--c4), var(--c1));
  box-shadow: 0 0 18px rgba(120, 180, 255, 0.5);
}
.brand em { font-style: normal; color: var(--ink-dim); font-weight: 500; }

.nav-links {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 0.28rem;
  margin-left: auto;
  list-style: none;
}
.nav-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  min-height: 34px;
  padding: 0.42em 0.95em;
  font-size: 0.95rem;
  font-weight: 560;
  line-height: 1.1;
  color: var(--ink-dim);
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  transition: color var(--dur-f) var(--ease), background var(--dur-f) var(--ease), border-color var(--dur-f) var(--ease);
}
.nav-links a:hover { color: var(--ink); background: var(--glass-bg-soft); border-color: var(--glass-border); }
.nav-links a.is-active { color: var(--ink); background: var(--glass-bg-strong); border-color: var(--glass-border-bright); box-shadow: var(--glass-hl); }

/* Wide screens: let every English title button sit wider and breathe.
   The inline nav only exists ≥1900px — the full English row (brand + 8
   buttons + lang switch) measures ≈1890px wide, so below 1900px the
   hamburger takes over instead of clipping the lang switch / last links. */
@media (min-width: 1900px) {
  .nav-inner { width: min(1900px, 100vw); gap: 1.5rem; }
  .nav-links { gap: 0.5rem; }
  .nav-links a { padding: 0.52em 1.3em; font-size: 1rem; min-height: 38px; }
}

/* ---------- mobile nav toggle (hamburger) ------------------------------ */
.nav-toggle {
  display: none;               /* hidden on desktop — shown below 1900px */
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;                /* comfortable touch target */
  padding: 0;
  border-radius: 12px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg-soft);
  color: var(--ink-dim);
  cursor: pointer;
  transition: color var(--dur-f) var(--ease), background var(--dur-f) var(--ease), border-color var(--dur-f) var(--ease);
}
.nav-toggle:hover { color: var(--ink); background: var(--glass-bg-strong); }
.nav-toggle:focus-visible {
  outline: 2px solid var(--c1);
  outline-offset: 2px;
}

.nav-toggle-icon { position: relative; width: 20px; height: 14px; display: inline-block; }
.nav-toggle-icon span {
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur-f) var(--ease), opacity var(--dur-f) var(--ease), top var(--dur-f) var(--ease);
}
.nav-toggle-icon span:nth-child(1) { top: 0; }
.nav-toggle-icon span:nth-child(2) { top: 6px; }
.nav-toggle-icon span:nth-child(3) { top: 12px; }

/* open state → animated "X" */
.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(1) { top: 6px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(3) { top: 6px; transform: rotate(-45deg); }

/* ---------- Hero ------------------------------------------------------ */

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: calc(var(--nav-h) + 4rem) 0 4rem;
  overflow: hidden;
}

.hero-title {
  width: 100%;
  justify-self: stretch;
  font-size: clamp(2.6rem, 7vw, 5.4rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.04;
  margin: 0.35em 0 0.4em;
  background: linear-gradient(115deg, #ffffff 20%, #bfd9ff 52%, #d6c6ff 80%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  max-width: 680px;
  margin-inline: auto;
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--ink-dim);
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 0.9rem;
  flex-wrap: wrap;
  margin-top: 2.4rem;
}

.hero-stats {
  margin-top: 3.6rem;
  display: flex;
  justify-content: center;
  gap: clamp(1.4rem, 5vw, 4rem);
  flex-wrap: wrap;
}
.stat b {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.stat span { font-size: 0.82rem; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.12em; }

.hero-scroll {
  position: absolute;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%);
  width: 30px; height: 46px;
  border: 1.5px solid var(--glass-border-bright);
  border-radius: var(--r-pill);
  display: grid;
  place-items: start center;
  padding-top: 8px;
}
.hero-scroll::after {
  content: "";
  width: 4px; height: 10px;
  border-radius: 4px;
  background: var(--ink-dim);
  animation: wheel 1.8s var(--ease) infinite;
}
@keyframes wheel { 0% { opacity: 1; transform: translateY(0); } 70% { opacity: 0; transform: translateY(14px); } 100% { opacity: 0; } }

/* ---------- Category cards (index) ------------------------------------ */

.cat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.6rem;
}

.cat-card {
  --accent: var(--c1);
  padding: 2rem 1.9rem;
  display: flex;
  flex-direction: column;
  min-height: 300px;
}
.cat-card .num {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 0.2em;
}
.cat-card h3 {
  font-size: 1.65rem;
  margin: 0.5em 0 0.3em;
}
.cat-card .cat-zh {
  color: var(--accent);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 0.9em;
}
.cat-card p { color: var(--ink-dim); flex: 1; margin-bottom: 1.1em; }
.cat-card .count {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent);
}
.cat-card .go {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.3em;
  font-weight: 700;
  font-size: 0.92rem;
  transition: transform var(--dur-f) var(--ease);
}
.cat-card:hover .go { transform: translateX(4px); }

.cat-accent-1 { --accent: var(--c1); }
.cat-accent-2 { --accent: var(--c2); }
.cat-accent-3 { --accent: var(--c3); }
.cat-accent-4 { --accent: var(--c4); }
.cat-accent-5 { --accent: var(--c5); }

/* ---------- Page header ------------------------------------------------ */

.page-head {
  padding: calc(var(--nav-h) + 5rem) 0 1.4rem;
  text-align: center;
}
.page-head h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); margin-bottom: 0.25em; }
.page-head .eyebrow { margin-bottom: 1rem; }

/* ---------- Subcategory tabs (category page) ---------------------------- */

.tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
  margin: 2rem 0 2.6rem;
}
.tab {
  --accent: var(--c1);
  padding: 0.55em 1.2em;
  border-radius: var(--r-pill);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg-soft);
  -webkit-backdrop-filter: blur(var(--blur-sm)) saturate(var(--saturate));
  backdrop-filter: blur(var(--blur-sm)) saturate(var(--saturate));
  color: var(--ink-dim);
  font: inherit;
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  transition: all var(--dur-n) var(--ease);
}
.tab:hover { color: var(--ink); border-color: var(--glass-border-bright); transform: translateY(-2px); }
.tab[aria-selected="true"] {
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 60%, transparent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  box-shadow: 0 0 22px color-mix(in srgb, var(--accent) 22%, transparent);
}

.tabpanel { display: none; animation: fadeUp 0.45s var(--ease); }
.tabpanel.is-active { display: block; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }

/* ==========================================================================
   Subcategory sticky floating nav (narrow viewports)

   When the horizontal .tabs cannot hold every subcategory button on one
   line, the category page switches into a vertical "stacked sections"
   layout (each .tabpanel becomes a full section) and the tab row turns into
   a floating bar that sticks under the top nav once the visitor scrolls:

     .subnav is-scrolled + body.subnav-collapsed  -> slim single-line pill
     first click on the pill                       -> expands to full buttons
     later clicks on a button                      -> smooth-scroll to section
     click outside                                 -> collapses back to pill

   The wide (>=~1900px) hamburger + the desktop tab strip are untouched.
   ========================================================================== */
body.subnav-narrow .tabs {
  position: sticky;
  top: calc(var(--nav-h) + 10px);
  z-index: 60;
  display: flex;
  flex-wrap: nowrap;
  justify-content: flex-start;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  max-width: none;
  margin: 0 0 1.2rem;
  padding: 0.45rem;
  box-sizing: border-box;
  border-radius: var(--r-md);
  border: 1px solid var(--glass-border);
  background:
    radial-gradient(140% 120% at 12% 0%, rgba(255, 255, 255, 0.08), transparent 46%),
    rgba(14, 14, 28, 0.88);
  -webkit-backdrop-filter: blur(var(--blur-lg)) saturate(var(--saturate));
  backdrop-filter: blur(var(--blur-lg)) saturate(var(--saturate));
  box-shadow: var(--sh-md), var(--glass-hl);
  overflow: hidden;
  transition: padding var(--dur-n) var(--ease), box-shadow var(--dur-n) var(--ease), border-radius var(--dur-n) var(--ease);
}
body.subnav-narrow .tabs .tab {
  flex: 0 1 auto;
  min-width: 0;
  max-width: 100%;
  padding: 0.5em 0.95em;
  font-size: 0.86rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: all var(--dur-n) var(--ease);
}
body.subnav-narrow .tabs .tab.is-current {
  color: var(--accent, var(--ink));
  border-color: color-mix(in srgb, var(--accent) 55%, transparent);
  background: color-mix(in srgb, var(--accent) 14%, var(--glass-bg-strong));
  box-shadow: 0 0 18px color-mix(in srgb, var(--accent) 18%, transparent);
}

/* Expanded: give every button enough room to read its full label */
body.subnav-narrow.subnav-expanded .tabs {
  flex-wrap: wrap;
  align-content: flex-start;
  gap: 0.5rem;
  padding: 0.7rem;
}
body.subnav-narrow.subnav-expanded .tabs .tab {
  flex: 1 1 auto;
  max-width: none;
  white-space: normal;
  overflow: visible;
  text-overflow: clip;
  line-height: 1.25;
}

/* Collapsed (scroll down, before first interaction) */
body.subnav-narrow.subnav-collapsed .tabs {
  cursor: pointer;
  justify-content: flex-start;
}
body.subnav-narrow.subnav-collapsed .tabs .tab {
  flex: 1 1 0;
}
body.subnav-narrow.subnav-collapsed .tabs .tab:not(.is-current) {
  display: none;
}
body.subnav-narrow.subnav-collapsed .tabs .tab.is-current {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  width: 100%;
  flex: 1 1 auto;
}
body.subnav-narrow.subnav-collapsed .tabs .tab.is-current::after {
  content: "⌄";
  font-size: 0.9em;
  line-height: 1;
  opacity: 0.75;
  margin-left: auto;
}

/* Vertical stacked sections in narrow mode */
body.subnav-narrow .tabpanel {
  display: block !important;
  animation: none;
  margin: 0 0 3.4rem;
  padding-top: 0.4rem;
  scroll-margin-top: calc(var(--nav-h) + 84px);
}
body.subnav-narrow .tabpanel:last-child { margin-bottom: 0; }
body.subnav-narrow .tabpanel .sub-head {
  border-top: 1px solid var(--glass-border);
  padding-top: 1rem;
  margin-bottom: 1.3rem;
}
body.subnav-narrow .tabpanel .sub-head h3 {
  color: var(--accent, var(--ink));
  font-size: 1.3rem;
}

@media (prefers-reduced-motion: reduce) {
  body.subnav-narrow .tabs { transition: none; }
}

/* ---------- Bias cards ------------------------------------------------- */

.bias-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.4rem;
}

.bias-card {
  padding: 1.7rem 1.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}
.bias-card .top { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; }
.bias-card h4 { font-size: 1.14rem; margin: 0; letter-spacing: -0.01em; }
.bias-card .definition { font-size: 0.95rem; color: var(--ink-dim); }

.examples-mini { display: grid; gap: 0.4rem; }
.examples-mini .example {
  font-size: 0.86rem;
  margin: 0;
  opacity: 0.85;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.example {
  border-left: 2px solid var(--glass-border);
  padding: 0.25em 0 0.25em 0.85em;
  margin-bottom: 0.5em;
  font-size: 0.9rem;
  color: var(--ink);
  opacity: 0.92;
}
.example::before { content: "例"; font-size: 0.7rem; font-weight: 700; color: var(--accent); margin-right: 0.5em; letter-spacing: 0.05em; }

.tag-row { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: auto; }
.mini-tag {
  font-size: 0.74rem;
  font-weight: 650;
  padding: 0.25em 0.75em;
  border-radius: var(--r-pill);
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  cursor: pointer;
  transition: background var(--dur-f) var(--ease), transform var(--dur-f) var(--ease);
}
.mini-tag:hover { background: color-mix(in srgb, var(--accent) 22%, transparent); transform: translateY(-1px); }

/* subcategory section headings (used when not using tabs) */
.sub-head {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  margin: 3.2rem 0 1.4rem;
}
.sub-head h3 { font-size: 1.45rem; margin: 0; }

/* ---------- Modal ------------------------------------------------------- */

.dialog {
  border: none;
  padding: 0;
  width: min(720px, 92vw);
  max-height: 86vh;
  border-radius: var(--r-lg);
  background: transparent;
  color: var(--ink);
  overflow: visible;
}
.dialog::backdrop {
  background: rgba(4, 4, 12, 0.62);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}
.dialog[open] { animation: modalIn 0.32s var(--ease-spring); }
@keyframes modalIn { from { opacity: 0; transform: translateY(22px) scale(0.96); } to { opacity: 1; transform: none; } }

.modal-panel {
  position: relative;
  display: flex;
  flex-direction: column;
  max-height: 86vh;
  /* the panel clips, .modal-scroll does the scrolling: that keeps the ✕ button
     pinned in view no matter how long the entry is */
  overflow: hidden;
  padding: 2.1rem 2.2rem 2.2rem;
  background:
    radial-gradient(130% 90% at 12% 0%, rgba(255,255,255,0.09), transparent 50%),
    rgba(16, 16, 30, 0.72);
  -webkit-backdrop-filter: blur(var(--blur-lg)) saturate(var(--saturate));
  backdrop-filter: blur(var(--blur-lg)) saturate(var(--saturate));
  border: 1px solid var(--glass-border-bright);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-lg), var(--glass-hl);
}
.modal-scroll {
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-right: 0.2rem;
}
.modal-close {
  position: absolute;
  z-index: 2;
  top: 16px; right: 16px;
  width: 36px; height: 36px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--ink);
  font-size: 1.1rem;
  cursor: pointer;
  transition: transform var(--dur-f) var(--ease), background var(--dur-f) var(--ease);
}
.modal-close:hover { transform: rotate(90deg) scale(1.06); background: var(--glass-bg-strong); }

.modal-title { font-size: 1.7rem; margin-bottom: 0.15em; padding-right: 2rem; }
.modal-body h5 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
  margin: 1.5em 0 0.4em;
}
.modal-body .definition { font-size: 1.02rem; color: var(--ink); }
.modal-refs li { margin-bottom: 0.45em; }

/* ---------- Research / references pages -------------------------------- */

.method-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.2rem;
}
.method-card { padding: 1.5rem 1.5rem; }
.method-card .step {
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--accent, var(--c1));
  font-size: 0.95rem;
}
.method-card h4 { margin: 0.4em 0 0.6em; font-size: 1.1rem; }
.method-card p { font-size: 0.95rem; color: var(--ink-dim); margin: 0; }
/* citation line — source language, monospace, visually subordinate */
.method-card .ref {
  margin-top: 0.6rem;
  font-size: 0.78rem;
  color: var(--ink-faint);
  font-family: ui-monospace, "SF Mono", Consolas, monospace;
}

.frontier-list { display: grid; gap: 1.1rem; }
.frontier-item { padding: 1.4rem 1.6rem; display: grid; gap: 0.3rem; }
.frontier-item h4 { margin: 0; font-size: 1.08rem; }
.frontier-item p { margin: 0; color: var(--ink-dim); font-size: 0.96rem; }
.frontier-item .ref {
  margin-top: 0.5rem;
  font-size: 0.78rem;
  color: var(--ink-faint);
  font-family: ui-monospace, "SF Mono", Consolas, monospace;
}

.refs-wrap { max-width: 880px; margin-inline: auto; }
.refs-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}
.refs-list li {
  padding: 1rem 1.25rem;
  border-radius: var(--r-sm);
  background: var(--glass-bg-soft);
  border: 1px solid rgba(255,255,255,0.07);
  font-size: 0.92rem;
  line-height: 1.65;
  transition: border-color var(--dur-f) var(--ease), background var(--dur-f) var(--ease);
}
.refs-list li:hover {
  border-color: var(--glass-border);
  background: var(--glass-bg);
}
.refs-list i { color: #cfd6ff; }

/* ---------- Footer ------------------------------------------------------ */

.footer {
  margin-top: 5rem;
  padding: 2.6rem 0 2.2rem;
  border-top: 1px solid var(--glass-border);
  background: rgba(6, 6, 15, 0.5);
  -webkit-backdrop-filter: blur(var(--blur-sm));
  backdrop-filter: blur(var(--blur-sm));
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  color: var(--ink-faint);
  font-size: 0.86rem;
}
.footer-inner a { color: var(--ink-dim); transition: color var(--dur-f); }
.footer-inner a:hover { color: var(--ink); }

/* ---------- no-flash guard ---------------------------------------------- */
/* lang-detect.js adds .i18n-pending when the markup language differs from the
   target language. Translatable text stays invisible until i18n.js has
   swapped it. The pure-CSS animation is a safety net: if the locale scripts
   fail for any reason, content still appears after 900ms. */
html.i18n-pending [data-i18n],
html.i18n-pending [data-i18n-html],
html.i18n-pending [data-render] {
  opacity: 0;
  animation: i18n-reveal 0s 900ms forwards;
}
@keyframes i18n-reveal { to { opacity: 1; } }

/* ---------- language switcher ------------------------------------------- */

.lang-switch { position: relative; flex: 0 0 auto; }

.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.42em 0.75em;
  border-radius: var(--r-pill);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg-soft);
  color: var(--ink-dim);
  font: inherit;
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
  transition: color var(--dur-f), background var(--dur-f), border-color var(--dur-f);
}
.lang-btn:hover { color: var(--ink); background: var(--glass-bg-strong); }
.lang-ico { display: inline-flex; }
.lang-caret { font-size: 0.66rem; opacity: 0.7; }

.lang-menu {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  min-width: 11rem;
  margin: 0;
  padding: 0.35rem;
  list-style: none;
  border-radius: var(--r-md);
  border: 1px solid var(--glass-border);
  background: rgba(14, 14, 28, 0.94);
  -webkit-backdrop-filter: blur(var(--blur-md)) saturate(var(--saturate));
  backdrop-filter: blur(var(--blur-md)) saturate(var(--saturate));
  box-shadow: var(--sh-md, 0 18px 40px rgba(0, 0, 0, 0.45));
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity var(--dur-f) var(--ease), transform var(--dur-f) var(--ease), visibility var(--dur-f);
  z-index: 120;
}
.lang-switch.is-open .lang-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-opt {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.5em 0.8em;
  border: 0;
  border-radius: var(--r-sm, 10px);
  background: transparent;
  color: var(--ink-dim);
  font: inherit;
  font-size: 0.88rem;
  cursor: pointer;
  transition: color var(--dur-f), background var(--dur-f);
}
.lang-opt:hover { color: var(--ink); background: var(--glass-bg-soft); }
.lang-opt.is-active { color: var(--ink); background: var(--glass-bg-strong); font-weight: 700; }
.lang-opt.is-active::after { content: " ✓"; }

/* ---------- misc --------------------------------------------------------- */

.chip-strip { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 1rem 0 0; }
.chip {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.3em 0.95em;
  border-radius: var(--r-pill);
  border: 1px solid var(--glass-border);
  color: var(--ink-dim);
  background: var(--glass-bg-soft);
}
.chip b { color: var(--ink); font-weight: 700; }

.axis-banner {
  margin-top: 3rem;
  padding: 1.6rem 2rem;
  border-radius: var(--r-lg);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2.4rem;
  justify-content: space-around;
  text-align: center;
}
.axis-banner .item b { display: block; font-size: 1.05rem; margin-bottom: 0.1rem; }
.axis-banner .item span { font-size: 0.82rem; color: var(--ink-faint); }

/* ==========================================================================
   Mobile / tablet navigation
   Below 1900px the inline link row collapses into a hamburger-toggled glass
   popout menu (liquid-glass card: translucent fill + backdrop blur + bright
   hairline + inner highlight). At ≥1900px the desktop top bar takes over.
   ========================================================================== */
@media (max-width: 1900px) {
  .nav-toggle { display: inline-flex; }

  /* push the switcher + toggle to the right; .nav-links leaves the flow */
  .nav-inner [data-lang-switch] { margin-left: auto; }

  /* keep the brand from squeezing the right-hand cluster on smaller screens */
  .brand { font-size: 1rem; }
  .brand em { display: none; }

  /* glass popout panel — card-like, right-aligned below the nav bar */
  .nav-links {
    position: fixed;
    top: calc(var(--nav-h) + 10px);
    right: clamp(12px, 3vw, 28px);
    left: auto;
    margin: 0;
    min-width: min(320px, 86vw);
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    padding: 0.65rem;
    list-style: none;
    max-height: calc(100vh - var(--nav-h) - 44px);
    overflow-y: auto;
    border-radius: var(--r-md);
    background:
      radial-gradient(140% 120% at 12% 0%, rgba(255, 255, 255, 0.1), transparent 46%),
      rgba(14, 14, 28, 0.86);
    -webkit-backdrop-filter: blur(var(--blur-lg)) saturate(var(--saturate));
    backdrop-filter: blur(var(--blur-lg)) saturate(var(--saturate));
    border: 1px solid var(--glass-border-bright);
    box-shadow: var(--sh-lg), var(--glass-hl);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px) scale(0.985);
    transform-origin: top right;
    transition: opacity var(--dur-n) var(--ease), transform var(--dur-n) var(--ease), visibility var(--dur-n);
    z-index: 101;
  }
  .nav.is-open .nav-links {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
  }

  .nav-links li + li { border-top: 1px solid rgba(255, 255, 255, 0.07); }
  .nav-links li:first-child { border-top: 0; }

  .nav-links a {
    display: flex;
    align-items: center;
    min-height: 46px;
    padding: 0.5em 0.95em;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--r-sm);
    border: 0;
    box-shadow: none;
  }
  .nav-links a:hover { border-color: transparent; }
  .nav-links a.is-active {
    color: var(--ink);
    background: color-mix(in srgb, var(--c1, #6ee7ff) 16%, var(--glass-bg-strong));
    border-left: 3px solid var(--c1, #6ee7ff);
    border-radius: var(--r-sm);
    box-shadow: inset 0 0 18px rgba(255, 255, 255, 0.03);
  }

  /* dim the page behind the glass panel while it is open */
  .nav.is-open {
    background: rgba(8, 8, 18, 0.72);
    -webkit-backdrop-filter: blur(var(--blur-md)) saturate(var(--saturate));
    backdrop-filter: blur(var(--blur-md)) saturate(var(--saturate));
    border-bottom-color: var(--glass-border);
  }
  body.nav-open { overflow: hidden; }
  body.nav-open::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 90;               /* below .nav (100) and the popout (101) */
    background: rgba(0, 0, 0, 0.42);
    -webkit-backdrop-filter: blur(3px);
    backdrop-filter: blur(3px);
  }

  .lang-btn { min-height: 44px; }
}

@media (max-width: 760px) {
  .cat-grid { grid-template-columns: 1fr; }
  .brand em { display: none; }
  .section { padding: 3.6rem 0; }
  .bias-grid { grid-template-columns: 1fr; }
  .lang-current { display: none; }
  .lang-btn { padding: 0.42em 0.6em; }
  .lang-menu { min-width: 9.5rem; }
}

/* --------------------------------------------------------------------------
   Small screens: the hamburger popout expands to the full viewport width
   (still a glass surface, but edge-to-edge below the top bar instead of a
   right-aligned card).
   -------------------------------------------------------------------------- */
@media (max-width: 1100px) {
  .nav-links {
    left: clamp(8px, 2vw, 18px);
    right: clamp(8px, 2vw, 18px);
    min-width: 0;
    width: auto;
  }
}
@media (max-width: 760px) {
  .nav-links {
    top: var(--nav-h);
    left: 0;
    right: 0;
    width: 100%;
    max-height: calc(100vh - var(--nav-h));
    border-radius: 0;
    border-left: 0;
    border-right: 0;
    border-bottom-color: var(--glass-border-bright);
    padding: 0.6rem clamp(1rem, 4vw, 2rem) 1rem;
  }
  body.subnav-narrow .tabs { top: var(--nav-h); }
}