/* Illusions d'optique — charte Grez Optic (mêmes couleurs, rayons et bandeaux que le thème du site).

   - Tout est préfixé .gio. Les règles sur les titres, paragraphes et listes sont écrites avec .gio-app devant
     pour passer avant celles du thème (ex. .post-body h2, .post-body li).
   - Mise en page « mobile d'abord » : les @container ci-dessous l'élargissent selon la largeur de l'outil
     (pas celle de l'écran) : dans une carte étroite d'un thème, il s'adapte tout seul. */

.gio-app {
  --acc: #008a94;
  --acc-b: #00a6b0;
  --acc-l: #5fd4dc;
  --navy: #011640;
  --ink: #1f2328;
  --mut: #5a6470;
  --line: #dfe5ea;
  --alt: #f4f7f9;
  --warm: #e4572e;
  --r: 16px;
  --f: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  container: gio / inline-size;
  max-width: 960px;
  margin: 1em auto;
  scroll-margin-top: 96px;
  font-family: var(--f);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
}
.gio-app *, .gio-app *::before, .gio-app *::after { box-sizing: border-box; }
.gio-app [hidden] { display: none !important; }
.gio-app .gio-nojs { display: none; margin: 0; padding: 14px 16px; background: var(--alt); border: 1px solid var(--line); border-radius: 12px; }
@media (scripting: none) { .gio-app .gio-nojs { display: block; } }

/* ---------- Coque ---------- */
.gio-shell {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #fff;
  box-shadow: 0 18px 50px rgba(1, 22, 64, .10);
}
.bookcard .gio-shell { box-shadow: none; }
.gio-app .gio-body { padding: 18px 14px 22px; }

/* ---------- Bandeau marine ---------- */
.gio-hero {
  container: gio-hero / inline-size;
  position: relative;
  overflow: hidden;
  padding: 24px 18px 26px;
  color: #fff;
  background:
    radial-gradient(70% 120% at 92% 0, #0d3a5e 0, transparent 60%),
    radial-gradient(50% 70% at 0 100%, #06305a 0, transparent 70%),
    linear-gradient(135deg, var(--navy) 0%, #02224d 100%);
}
.gio-hero::before {
  content: "";
  position: absolute;
  right: -110px; top: -130px;
  width: 420px; height: 420px;
  border-radius: 50%;
  border: 2px solid rgba(0, 166, 176, .35);
}
.gio-hero::after {
  content: "";
  position: absolute;
  left: -70px; bottom: -90px;
  width: 240px; height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 166, 176, .22), transparent 70%);
}
.gio-hero > * { position: relative; z-index: 1; }
.gio-app .gio-kicker {
  display: inline-block;
  margin: 0 0 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--acc-l);
}
.gio-app .gio-hero h2 {
  margin: 0 0 8px;
  padding: 0;
  border: 0;
  font-family: var(--f);
  font-size: clamp(24px, 6.4cqw, 38px);
  line-height: 1.15;
  font-weight: 800;
  color: #fff;
  letter-spacing: -.01em;
}
.gio-app .gio-hero h2::before, .gio-app .gio-hero h2::after { content: none; }
.gio-app .gio-hero p { margin: 0; max-width: 62ch; color: rgba(255, 255, 255, .86); font-size: 15px; }
.gio-app .gio-hero .gio-count {
  display: inline-block;
  margin-top: 14px;
  padding: 4px 12px;
  border-radius: 99px;
  background: rgba(255, 255, 255, .12);
  border: 1px solid rgba(255, 255, 255, .22);
  font-size: 13px;
  font-weight: 600;
  color: #fff;
}

/* ---------- Boutons ---------- */
.gio-app button.gio-btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  margin: 0;
  padding: 10px 20px;
  border: 2px solid var(--acc);
  border-radius: 99px;
  background: var(--acc);
  color: #fff;
  font: 700 15px/1.2 var(--f);
  letter-spacing: 0;
  text-transform: none;
  text-decoration: none;
  cursor: pointer;
  box-shadow: none;
  transition: background .15s, border-color .15s, color .15s, transform .15s;
}
.gio-app button.gio-btn:hover { background: var(--acc-b); border-color: var(--acc-b); color: #fff; }
.gio-app button.gio-btn:active { transform: translateY(1px); }
.gio-app button.gio-btn:focus-visible, .gio-app .gio-card:focus-visible, .gio-app .gio-chip:focus-visible,
.gio-app input[type=range]:focus-visible, .gio-app .gio-link:focus-visible {
  outline: 3px solid var(--acc-l);
  outline-offset: 2px;
}
.gio-app button.gio-btn.ghost { background: #fff; color: var(--navy); border-color: var(--line); }
.gio-app button.gio-btn.ghost:hover { background: var(--alt); border-color: var(--acc); color: var(--navy); }
.gio-app button.gio-btn.on { background: var(--navy); border-color: var(--navy); color: #fff; }
.gio-app button.gio-btn[disabled] { opacity: .45; cursor: default; }
.gio-app button.gio-btn.small { min-height: 38px; padding: 7px 16px; font-size: 14px; }

/* ---------- Filtres ---------- */
.gio-chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 16px; padding: 0; list-style: none; }
.gio-app button.gio-chip {
  appearance: none;
  min-height: 38px;
  padding: 6px 14px;
  border: 1px solid var(--line);
  border-radius: 99px;
  background: #fff;
  color: var(--ink);
  font: 600 14px/1.2 var(--f);
  cursor: pointer;
  text-transform: none;
  letter-spacing: 0;
}
.gio-app button.gio-chip:hover { border-color: var(--acc); background: var(--alt); }
.gio-app button.gio-chip[aria-pressed=true] { background: var(--navy); border-color: var(--navy); color: #fff; }

/* ---------- Grille de cartes ---------- */
.gio-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; margin: 0; padding: 0; list-style: none; }
@container gio (min-width: 560px) { .gio-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@container gio (min-width: 860px) { .gio-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.gio-grid li { margin: 0; padding: 0; list-style: none; }
.gio-app button.gio-card, .gio-app a.gio-card {
  appearance: none;
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 4px 12px;
  align-items: start;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: #fff;
  color: var(--ink);
  text-align: left;
  font: 400 15px/1.4 var(--f);
  text-transform: none;
  letter-spacing: 0;
  cursor: pointer;
  box-shadow: none;
  transition: border-color .15s, box-shadow .15s, transform .15s;
}
.gio-app button.gio-card:hover, .gio-app a.gio-card:hover { border-color: var(--acc); box-shadow: 0 10px 26px rgba(1, 22, 64, .10); transform: translateY(-2px); }
.gio-card .gio-ico {
  grid-row: 1 / span 3;
  display: grid;
  place-items: center;
  width: 48px; height: 48px;
  border-radius: 14px;
  background: var(--alt);
  border: 1px solid var(--line);
}
.gio-card .gio-ico svg { width: 30px; height: 30px; }
.gio-card .gio-ct { display: block; font-weight: 800; font-size: 16px; color: var(--navy); }
.gio-card .gio-cd { display: block; color: var(--mut); font-size: 14px; }
.gio-card .gio-cm { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }
.gio-tag {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 99px;
  background: var(--alt);
  border: 1px solid var(--line);
  color: var(--mut);
  font-size: 12px;
  font-weight: 600;
}
.gio-tag.acc { background: #e5f6f7; border-color: #bfe6e9; color: #00646b; }

/* ---------- Fiche d'une illusion ---------- */
.gio-top { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; margin: 0 0 12px; }
.gio-app .gio-top h3 {
  flex: 1 1 100%;
  order: 3;
  margin: 4px 0 0;
  padding: 0;
  border: 0;
  font: 800 clamp(21px, 4.6cqw, 28px)/1.2 var(--f);
  color: var(--navy);
}
.gio-app .gio-top h3::before, .gio-app .gio-top h3::after { content: none; }
.gio-app .gio-top h3:focus { outline: none; }
.gio-app .gio-lead { margin: 0 0 14px; color: var(--mut); font-size: 15px; }

.gio-stage {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: #fff;
}
.gio-stage svg { display: block; width: 100%; height: auto; max-height: 70vh; }
.gio-stage.dark { background: #0b0b0c; }

.gio-ctrls {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 14px 0 0;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--alt);
}
.gio-ctrl label, .gio-ctrl .gio-lbl { display: flex; justify-content: space-between; gap: 12px; margin: 0 0 6px; font-weight: 700; font-size: 14px; color: var(--navy); }
.gio-ctrl output { font-variant-numeric: tabular-nums; color: var(--acc); font-weight: 700; }
.gio-app input[type=range] {
  appearance: none;
  -webkit-appearance: none;
  display: block;
  width: 100%;
  height: 32px;
  margin: 0;
  padding: 0;
  background: transparent;
  cursor: pointer;
  accent-color: var(--acc);
}
.gio-app input[type=range]::-webkit-slider-runnable-track { height: 8px; border-radius: 99px; background: #cfd8de; }
.gio-app input[type=range]::-moz-range-track { height: 8px; border-radius: 99px; background: #cfd8de; }
.gio-app input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 28px; height: 28px; margin-top: -10px; border-radius: 50%; border: 3px solid #fff; background: var(--acc); box-shadow: 0 2px 8px rgba(1, 22, 64, .35); }
.gio-app input[type=range]::-moz-range-thumb { width: 22px; height: 22px; border-radius: 50%; border: 3px solid #fff; background: var(--acc); box-shadow: 0 2px 8px rgba(1, 22, 64, .35); }
.gio-app input[type=range][disabled] { opacity: .5; cursor: default; }
.gio-btns { display: flex; flex-wrap: wrap; gap: 8px; }

.gio-result {
  margin: 14px 0 0;
  padding: 14px 16px;
  border-radius: var(--r);
  border: 1px solid #bfe6e9;
  background: #e5f6f7;
  color: #00424a;
  font-size: 15px;
}
.gio-result:empty { display: none; }
.gio-result strong { color: var(--navy); }
.gio-app .gio-prompt { margin: 0 0 4px; font-size: 14px; color: var(--mut); }

/* ---------- Explications ---------- */
.gio-expl { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; margin: 18px 0 0; }
@container gio (min-width: 780px) { .gio-expl { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.gio-blk { padding: 14px 16px; border: 1px solid var(--line); border-radius: var(--r); background: #fff; }
.gio-app .gio-blk h4, .gio-app .gio-blk h2 {
  display: flex; align-items: center; gap: 8px;
  margin: 0 0 6px; padding: 0; border: 0;
  font: 800 13px/1.3 var(--f);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--acc);
}
.gio-app .gio-blk h4::before, .gio-app .gio-blk h2::before { content: ""; width: 18px; height: 3px; border-radius: 3px; background: var(--acc-b); }
.gio-app .gio-blk p { margin: 0; font-size: 15px; }
.gio-more { margin: 14px 0 0; padding: 12px 16px; border-radius: var(--r); background: var(--alt); border: 1px solid var(--line); font-size: 14px; }
.gio-more strong { color: var(--navy); }
.gio-app .gio-link { color: var(--acc); font-weight: 700; text-decoration: underline; text-underline-offset: 2px; }
.gio-app .gio-link:hover { color: var(--navy); }
.gio-nav { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; margin: 18px 0 0; }
.gio-note { margin: 16px 0 0; padding: 12px 16px; border-left: 4px solid var(--acc-b); background: var(--alt); border-radius: 0 12px 12px 0; font-size: 13.5px; color: var(--mut); }
.gio-app .gio-note p { margin: 0; }

/* ---------- Spécifique : post-image et Troxler ---------- */
.gio-big { display: grid; place-items: center; padding: 14px; text-align: center; font-weight: 800; color: var(--navy); font-size: 20px; }
.gio-timer { font-variant-numeric: tabular-nums; font-size: 15px; color: var(--navy); font-weight: 700; }

@media (prefers-reduced-motion: reduce) {
  .gio-app *, .gio-app *::before, .gio-app *::after { transition: none !important; animation: none !important; }
}

/* ---------- Petits écrans (téléphone) : filtres en bande défilante, réglages compacts ---------- */
.gio-chip .gio-n { display: inline-block; min-width: 1.4em; margin-left: 4px; padding: 0 5px; border-radius: 99px; background: var(--alt); color: var(--mut); font-size: 12px; font-weight: 700; text-align: center; }
.gio-app button.gio-chip[aria-pressed=true] .gio-n { background: rgba(255, 255, 255, .2); color: #fff; }
@container gio (max-width: 559px) {
  .gio-app .gio-body { padding: 14px 12px 18px; }
  .gio-chips {
    flex-wrap: nowrap;
    overflow-x: auto;
    margin: 0 -12px 14px;
    padding: 2px 12px 8px;
    scroll-snap-type: x proximity;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .gio-chips::-webkit-scrollbar { display: none; }
  .gio-chips li { flex: none; scroll-snap-align: start; margin: 0; padding: 0; list-style: none; }
  .gio-app button.gio-chip { white-space: nowrap; }
  .gio-ctrls { gap: 10px; margin-top: 10px; padding: 12px; }
  .gio-ctrl label, .gio-ctrl .gio-lbl { margin-bottom: 2px; font-size: 13.5px; }
  .gio-app input[type=range] { height: 30px; }
  .gio-btns { gap: 6px; }
  .gio-app button.gio-btn { min-height: 40px; padding: 8px 14px; font-size: 14px; }
  .gio-app button.gio-btn.small { min-height: 38px; padding: 6px 12px; font-size: 13.5px; }
  .gio-btns.gio-choices { display: grid; grid-auto-flow: column; grid-auto-columns: minmax(0, 1fr); }
  .gio-btns.gio-choices button.gio-btn { padding: 6px 6px; line-height: 1.15; text-align: center; }
  .gio-app .gio-prompt { margin: 0 0 -4px; font-size: 13.5px; }
  .gio-result { margin-top: 10px; padding: 12px 14px; font-size: 14.5px; }
  .gio-app .gio-lead { margin-bottom: 10px; font-size: 14.5px; }
  .gio-top { margin-bottom: 8px; }
  .gio-expl { gap: 10px; margin-top: 14px; }
  .gio-blk { padding: 12px 14px; }
  .gio-nav .gio-btn { flex: 1 1 100%; }
}

/* ---------- Conseil « grand écran » : affiché seulement quand l'outil est étroit ---------- */
.gio-bigscreen, .gio-bigtag { display: none; }
@container gio (max-width: 559px) {
  .gio-app p.gio-bigscreen {
    display: block;
    margin: 0 0 10px;
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid #bfe6e9;
    background: #e5f6f7;
    color: #00424a;
    font-size: 13.5px;
    line-height: 1.4;
  }
  .gio-app p.gio-bigscreen.need { border-color: #f1c9bd; background: #fdf0ec; color: #7a2c15; }
  .gio-app p.gio-bigscreen strong { color: inherit; }
  .gio-tag.gio-bigtag { display: inline-block; background: #e5f6f7; border-color: #bfe6e9; color: #00646b; }
  .gio-tag.gio-bigtag.need { background: #fdf0ec; border-color: #f1c9bd; color: #9a3a1c; }
}

/* ---------- Pages par illusion : cartes en liens, navigation, texte de repli ---------- */
.gio-app a.gio-card { text-decoration: none; }
.gio-app a.gio-card:visited { color: var(--ink); }
.gio-app .gio-ssr { margin: 0 0 14px; }
.gio-app .gio-ssr-list { padding-left: 1.2em; }
.gio-app .gio-blk h2 { margin: 0 0 6px; }
.gio-pagenav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: space-between;
  max-width: 960px;
  margin: 18px auto 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
.gio-pagenav a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 16px;
  border: 1px solid #dfe5ea;
  border-radius: 99px;
  background: #fff;
  color: #011640;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}
.gio-pagenav a:hover { border-color: #008a94; background: #f4f7f9; }
.gio-pagenav a:focus-visible { outline: 3px solid #5fd4dc; outline-offset: 2px; }
.gio-pagenav .gio-pn-all { background: #011640; border-color: #011640; color: #fff; }
.gio-pagenav .gio-pn-all:hover { background: #02224d; color: #fff; }
.gio-pagenav .gio-pn-next { margin-left: auto; }
@media (max-width: 559px) {
  .gio-pagenav a { flex: 1 1 100%; justify-content: center; }
  .gio-pagenav .gio-pn-next { margin-left: 0; }
}

/* Texte sous une illusion (pages par illusion) */
.gio-more-pages {
  max-width: 960px;
  margin: 22px auto 0;
  padding: 18px 20px;
  border: 1px solid #dfe5ea;
  border-radius: 16px;
  background: #fff;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  color: #1f2328;
}
.gio-more-pages h2 { margin: 18px 0 8px; padding: 0; border: 0; font-size: 20px; line-height: 1.25; color: #011640; }
.gio-more-pages h2:first-child { margin-top: 0; }
.gio-more-pages h2::before, .gio-more-pages h2::after { content: none; }
.gio-more-pages p { margin: 0 0 8px; }
.gio-more-pages ul { margin: 0 0 8px; padding-left: 1.2em; }
.gio-more-pages li { margin: 0 0 4px; }
.gio-more-pages a { color: #008a94; font-weight: 700; text-decoration: underline; text-underline-offset: 2px; }
.gio-more-pages .gio-small { font-size: 13.5px; color: #5a6470; }