/* =================================================================
   Martin BTC — Le Lab, expérience nº 2 : « 10 456 km »  (page /lab)
   Feuille dédiée, chargée APRÈS css/style.css dont elle reprend les
   variables (couleurs, polices, --ease). Aucune dépendance, aucun script
   externe : tout respecte la CSP du site (script-src 'self').

   Structure : six actes. Les actes 2, 3 et 4 sont des sections hautes
   (plusieurs écrans) dont l'enfant .pin reste collé (position: sticky)
   pendant qu'on les traverse ; js/lab.js lit la progression du scroll
   dans chacune et pilote les canvas.
   ================================================================= */

/* ---------- 0. Page ---------- */
html.lab-html { scroll-behavior: auto; }
/* Pas d'overflow-x: clip ici : propagé à la fenêtre, il supprimait le
   défilement vertical (scrollHeight = hauteur de l'écran). Le body du site
   a déjà overflow-x: hidden, qui suffit. */
body.lab.lab-trace { user-select: none; -webkit-user-select: none; }
/* Le curseur système disparaît au profit du point d'encre, seulement
   quand il y a une vraie souris. */
@media (pointer: fine) {
  body.lab.lab-souris, body.lab.lab-souris a, body.lab.lab-souris button { cursor: none; }
}

main.lab-main { position: relative; z-index: 1; }

/* ---------- 1. Calques fixes ---------- */
.lab-calque { position: fixed; inset: 0; width: 100%; height: 100%; pointer-events: none; }
#lab-globe { z-index: 0; }
#lab-trail { z-index: 40; }
#lab-ink   { z-index: 41; touch-action: pan-y; }
/* Mode dessin (écrans tactiles) : la toile capte le doigt, la page ne
   défile plus. Le bandeau du haut reste au-dessus pour pouvoir sortir. */
body.lab-dessin #lab-ink { pointer-events: auto; touch-action: none; z-index: 55; }
body.lab-dessin main.lab-main { pointer-events: none; }

.lab-flash { position: fixed; inset: 0; z-index: 45; pointer-events: none; opacity: 0;
  background: radial-gradient(60% 60% at 50% 50%, rgba(247,147,26,0.55), rgba(247,147,26,0.12) 60%, transparent 100%);
  transition: opacity 1.4s var(--ease); }
body.lab-flash-on .lab-flash { opacity: 1; transition-duration: 0.12s; }

.lab-curseur { position: fixed; left: 0; top: 0; z-index: 70; width: 10px; height: 10px; margin: -5px 0 0 -5px;
  border-radius: 50%; background: var(--orange); pointer-events: none; opacity: 0;
  transition: transform 0.18s var(--ease), opacity 0.3s, background 0.2s;
  box-shadow: 0 0 0 6px rgba(247,147,26,0.15), 0 0 18px rgba(247,147,26,0.55); }
.lab-curseur::after { content: ""; position: absolute; inset: -14px; border-radius: 50%; border: 1px solid rgba(247,147,26,0.35);
  transition: transform 0.25s var(--ease), opacity 0.25s; }
body.lab-souris .lab-curseur { opacity: 1; }
.lab-curseur.est-lien { transform: scale(1.8); background: var(--text); }
.lab-curseur.est-lien::after { transform: scale(1.3); opacity: 0.6; }
.lab-curseur.trace { transform: scale(0.7); }

/* ---------- 2. Bandeau du haut ---------- */
.lab-top { position: fixed; top: 0; left: 0; right: 0; z-index: 60; display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 0.8rem clamp(1rem, 3vw, 1.6rem); pointer-events: none; }
.lab-top > * { pointer-events: auto; }
.lab-top .brand small { color: var(--orange); letter-spacing: 0.22em; }
.lab-actions { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; justify-content: flex-end; }
.lab-btn { display: inline-flex; align-items: center; gap: 0.45rem; padding: 0.55rem 0.95rem; border-radius: 999px;
  font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text); background: rgba(11,11,13,0.62); border: 1px solid var(--line-2); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  transition: border-color 0.25s, background 0.25s, color 0.25s, transform 0.25s var(--ease); min-height: 40px; }
.lab-btn:hover, .lab-btn:focus-visible { border-color: var(--orange-line); color: var(--orange-2); background: rgba(247,147,26,0.10); }
.lab-btn svg { width: 1em; height: 1em; }
.lab-btn[aria-pressed="true"] { background: var(--orange); color: #1A0F00; border-color: var(--orange); }
.lab-btn--tactile { display: none; }
@media (pointer: coarse) { .lab-btn--tactile { display: inline-flex; } }
/* Petits écrans : une seule rangée, les libellés secondaires deviennent
   des icônes (aria-label posé dans le HTML). */
@media (max-width: 760px) {
  .lab-top { padding: 0.6rem 0.85rem; }
  .lab-top .brand small { display: none; }
  .lab-top .brand img { width: 30px; height: 30px; }
  .lab-actions { flex-wrap: nowrap; gap: 0.35rem; }
  .lab-btn { padding: 0.5rem 0.7rem; min-height: 44px; min-width: 44px; justify-content: center; }   /* cible confortable au doigt */
  .lab-btn .lab-btn-txt { display: none; }
}

/* ---------- 3. Grammaire commune ---------- */
.acte { position: relative; }
.pin { position: sticky; top: 0; height: 100vh; height: 100svh; overflow: hidden; }
.lab-kicker { display: inline-flex; align-items: center; gap: 0.55rem; font-family: var(--font-mono); font-size: 0.74rem;
  letter-spacing: 0.24em; text-transform: uppercase; color: var(--orange); }
.lab-kicker::before { content: ""; width: 26px; height: 1px; background: var(--orange); opacity: 0.7; }
.lab-mono { font-family: var(--font-mono); letter-spacing: 0.04em; }
.lab-num { font-family: var(--font-display); font-weight: 700; letter-spacing: -0.04em; line-height: 0.9; font-variant-numeric: tabular-nums; }
.lab-note { color: var(--muted-2); font-size: 0.9rem; max-width: 52ch; }
.lab-note strong { color: var(--text); font-weight: 600; }
.magnet { will-change: transform; }

/* ---------- 4. Acte 1 : l'ouverture ---------- */
.acte--hero { min-height: 100vh; min-height: 100svh; display: grid; align-items: center; padding: clamp(6rem, 14vh, 9rem) 0 4rem; }
.hero-copy { position: relative; max-width: 42rem; }
.hero-copy h1 { font-size: clamp(2.7rem, 8.2vw, 7.2rem); font-weight: 700; line-height: 0.98; letter-spacing: -0.045em; margin-top: 1rem; }
.hero-copy h1 .mot { display: inline-block; white-space: nowrap; }
.hero-copy h1 .ch { display: inline-block; will-change: transform; transition: color 0.3s; }
.hero-copy h1 .ch.o { color: var(--orange); }
.hero-copy .lead { margin-top: 1.4rem; }
.hero-bloc { margin-top: 1.6rem; display: inline-flex; align-items: baseline; gap: 0.7rem; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: 0.8rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted-2); }
.hero-bloc b { font-weight: 500; color: var(--text); font-size: 1.1rem; letter-spacing: 0.08em; font-variant-numeric: tabular-nums; }
.hero-bloc .vivant { width: 8px; height: 8px; border-radius: 50%; background: var(--orange); box-shadow: 0 0 0 0 rgba(247,147,26,0.6); animation: lab-pouls 2.4s infinite; align-self: center; }
@keyframes lab-pouls { 0% { box-shadow: 0 0 0 0 rgba(247,147,26,0.6); } 70% { box-shadow: 0 0 0 12px rgba(247,147,26,0); } 100% { box-shadow: 0 0 0 0 rgba(247,147,26,0); } }
.hero-bloc[data-etat="hors-ligne"] .vivant { animation: none; background: var(--muted-2); }
.hero-indices { margin-top: 2.6rem; display: flex; flex-wrap: wrap; gap: 0.9rem 1.8rem; font-family: var(--font-mono); font-size: 0.76rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted-2); }
.hero-indices span { display: inline-flex; align-items: center; gap: 0.5rem; }
.hero-indices .fleche { display: inline-block; animation: lab-saut 1.8s infinite; }
@keyframes lab-saut { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(6px); } }
.hero-indices .indice-doigt { display: none; }
@media (pointer: coarse) { .hero-indices .indice-souris { display: none; } .hero-indices .indice-doigt { display: inline-flex; } }
@media (max-width: 760px) {
  .acte--hero { align-items: start; padding-top: 5.6rem; }
  .hero-copy { max-width: none; }
  /* Sur téléphone, le globe monte derrière les lignes d'aide : un détourage sombre les garde lisibles. */
  .hero-bloc, .hero-indices { text-shadow: 0 0 6px #0b0b0d, 0 0 14px #0b0b0d, 0 0 2px #0b0b0d; }
}

/* ---------- 5. Acte 2 : la traversée ---------- */
.acte--traversee { height: 460vh; }
.traversee-ui { position: absolute; inset: 0; padding: clamp(5rem, 11vh, 7rem) clamp(1.1rem, 4vw, 2.2rem) clamp(1.4rem, 4vh, 2.4rem); display: grid;
  grid-template-rows: auto 1fr auto; pointer-events: none; }
.traversee-ui > * { pointer-events: auto; }
.lab-km { display: flex; align-items: baseline; gap: 0.6rem; flex-wrap: wrap; }
.lab-km b { font-size: clamp(2.6rem, 7vw, 5.6rem); color: var(--text); }
.lab-km b.lab-num { font-weight: 700; }
.lab-km span { font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted-2); }
.lab-etape { justify-self: end; flex-shrink: 0; white-space: nowrap; font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--orange); }
.traversee-haut { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; }
.escales { position: relative; align-self: end; max-width: 25rem; min-height: 11rem; }
.escale { position: absolute; left: 0; bottom: 0; width: 100%; opacity: 0; transform: translateY(26px) rotateX(8deg); transform-origin: 50% 100%;
  transition: opacity 0.55s var(--ease), transform 0.65s var(--ease); pointer-events: none; }
.escale.active { opacity: 1; transform: none; pointer-events: auto; }
.escale-carte { display: grid; grid-template-columns: 1fr 112px; gap: 1rem; align-items: center; padding: 1rem 1.1rem;
  border-radius: var(--radius); background: rgba(16,17,21,0.72); border: 1px solid var(--line-2);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); box-shadow: var(--shadow); will-change: transform; transform-style: preserve-3d; }
.escale-carte .drapeau { display: inline-block; font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.2em; color: var(--orange); border: 1px solid var(--orange-line); border-radius: 6px; padding: 0.2rem 0.45rem 0.15rem; line-height: 1; }
.escale-carte h3 { font-size: 1.15rem; margin-top: 0.35rem; letter-spacing: -0.02em; }
.escale-carte p { color: var(--muted); font-size: 0.9rem; margin-top: 0.25rem; }
.escale-carte a.lien { display: inline-flex; align-items: center; gap: 0.35rem; margin-top: 0.6rem; font-family: var(--font-mono); font-size: 0.74rem;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--orange-2); }
.escale-carte a.lien:hover { color: var(--text); }
.escale-carte img { width: 112px; height: 63px; object-fit: cover; border-radius: 8px; background: var(--surface-2); border: 1px solid var(--line); }
.escale--intro .escale-carte { grid-template-columns: 1fr; }
.escale--intro h3 { font-size: 1.3rem; }
.traversee-bas { display: flex; justify-content: space-between; gap: 1rem; font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted-2); }
@media (max-width: 760px) {
  .escales { max-width: none; }
  .escale-carte { grid-template-columns: 1fr 96px; padding: 0.85rem 0.95rem; }
  .escale-carte img { width: 96px; height: 54px; }
  .traversee-bas span:last-child { display: none; }
}

/* ---------- 6. Acte 3 : le compte à rebours ---------- */
.acte--compte { height: 280vh; }
.compte-ui { position: absolute; inset: 0; display: grid; grid-template-rows: auto 1fr auto; padding: clamp(5rem, 11vh, 7rem) clamp(1.1rem, 4vw, 2.2rem) clamp(1.6rem, 5vh, 3rem); pointer-events: none; }
#lab-jours { position: absolute; inset: 0; width: 100%; height: 100%; }
.compte-legende { align-self: end; text-align: center; position: relative; }
.compte-legende .lab-mono { font-size: 0.8rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); }
.compte-legende .lab-mono b { color: var(--orange); font-weight: 500; }
.compte-legende .lab-note { margin: 0.7rem auto 0; text-align: center; }
.compte-sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- 7. Acte 4 : les dix mille ---------- */
.acte--particules { height: 440vh; }
#lab-dollars { position: absolute; inset: 0; width: 100%; height: 100%; }
.dollars-ui { position: absolute; inset: 0; padding: clamp(5rem, 11vh, 7rem) clamp(1.1rem, 4vw, 2.2rem) clamp(1.6rem, 5vh, 3rem); display: grid; grid-template-rows: auto 1fr auto; pointer-events: none; }
.dollars-ui > * { pointer-events: auto; }
.dollars-texte { max-width: 34rem; transition: opacity 0.5s var(--ease), transform 0.6s var(--ease); }
.dollars-texte h2 { font-size: clamp(1.9rem, 4.6vw, 3.4rem); letter-spacing: -0.03em; }
.dollars-texte p { margin-top: 0.6rem; color: var(--muted); }
.dollars-texte[hidden] { display: block; opacity: 0; transform: translateY(14px); pointer-events: none; }
.dollars-t2 { justify-self: end; text-align: right; }
.lab-legende { align-self: end; display: flex; gap: 0.4rem; transition: opacity 0.5s var(--ease); }
.lab-legende[hidden] { display: flex; opacity: 0; pointer-events: none; }
.lab-legende div { flex: 1 1 0; min-width: 0; padding-top: 0.6rem; border-top: 2px solid var(--c, var(--orange)); }
.lab-legende b { display: block; font-family: var(--font-display); font-size: clamp(1rem, 2.4vw, 1.5rem); letter-spacing: -0.02em; white-space: nowrap; }
.lab-legende span { display: block; font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
@media (max-width: 760px) {
  .dollars-ui { grid-template-rows: auto 1fr auto auto; }
  .dollars-t2 { grid-row: 3; justify-self: start; text-align: left; }
  .lab-legende { grid-row: 4; }
  .lab-legende { flex-wrap: wrap; }
  .lab-legende div { flex-basis: 45%; }
}

/* ---------- 8. Acte 5 : la chaîne ---------- */
.acte--chaine { min-height: 100vh; min-height: 100svh; display: grid; align-items: center; padding: clamp(5rem, 12vh, 8rem) 0; }
.chaine-grille { display: grid; gap: 2.4rem; }
@media (min-width: 880px) { .chaine-grille { grid-template-columns: 1.1fr 1fr; align-items: center; gap: clamp(2rem, 5vw, 4rem); } }
.chaine-grille h2 { font-size: clamp(2rem, 5vw, 3.6rem); letter-spacing: -0.03em; margin-top: 1rem; }
.chaine-grille .lead { margin-top: 1rem; }
.bloc-carte { border-radius: var(--radius-lg); border: 1px solid var(--line-2); background: linear-gradient(180deg, rgba(22,24,29,0.9), rgba(16,17,21,0.9)); padding: clamp(1.4rem, 3.5vw, 2.4rem); position: relative; overflow: hidden; }
.bloc-carte::before { content: ""; position: absolute; inset: -40% -20% auto; height: 70%; background: radial-gradient(50% 60% at 50% 50%, rgba(247,147,26,0.18), transparent 70%); pointer-events: none; }
.bloc-ligne { display: flex; justify-content: space-between; gap: 1rem; align-items: baseline; padding: 0.8rem 0; border-top: 1px solid var(--line); font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted-2); }
.bloc-ligne:first-of-type { border-top: 0; padding-top: 0; }
.bloc-ligne b { font-weight: 500; color: var(--text); letter-spacing: 0.04em; font-variant-numeric: tabular-nums; font-size: 0.95rem; }
.bloc-hauteur { font-size: clamp(2.6rem, 6.5vw, 4.6rem); color: var(--text); display: flex; align-items: baseline; gap: 0.5rem; flex-wrap: wrap; }
.bloc-hauteur small { font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--orange); font-weight: 500; }
.bloc-lus b { color: var(--orange-2); font-size: 1.4rem; }
.bloc-hors-ligne { margin-top: 1rem; color: var(--muted-2); font-size: 0.9rem; }
.bloc-carte .lab-note { margin-top: 1.2rem; }
.bloc-id { font-family: var(--font-mono); font-size: 0.68rem; color: var(--muted-2); word-break: break-all; margin-top: 0.5rem; letter-spacing: 0.02em; opacity: 0.8; }

/* ---------- 9. Acte 6 : la carte postale ---------- */
.acte--carte { padding: clamp(4rem, 10vh, 7rem) 0 clamp(3rem, 8vh, 5rem); }
.carte-grille { display: grid; gap: 2rem; }
@media (min-width: 980px) { .carte-grille { grid-template-columns: 1fr 1.25fr; align-items: center; gap: clamp(2rem, 5vw, 4rem); } }
.carte-grille h2 { font-size: clamp(2rem, 5vw, 3.6rem); letter-spacing: -0.03em; margin-top: 1rem; }
.carte-grille .lead { margin-top: 1rem; }
.carte-apercu { position: relative; border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--line-2); box-shadow: var(--shadow); background: var(--surface); aspect-ratio: 1200 / 630; }
.carte-apercu canvas { width: 100%; height: 100%; display: block; }
.carte-actions { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 1.6rem; }
.carte-actions .btn { min-height: 44px; }
.carte-actions .btn[hidden] { display: none; }
.carte-etat { margin-top: 0.8rem; font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.08em; color: var(--muted-2); min-height: 1.2em; }

/* Tampon Lightning : fenêtre native */
/* margin: auto rétabli : le reset « * { margin: 0 } » de style.css enlève au
   <dialog> son centrage par défaut, et la fenêtre partait en haut à gauche. */
.tampon { margin: auto; border: 1px solid var(--line-2); border-radius: var(--radius-lg); background: var(--surface); color: var(--text); padding: 0; max-width: min(92vw, 26rem); width: 100%; box-shadow: var(--shadow); }
.tampon::backdrop { background: rgba(0,0,0,0.7); backdrop-filter: blur(6px); }
.tampon-corps { padding: 1.4rem; display: grid; gap: 0.9rem; justify-items: center; text-align: center; }
.tampon-corps h3 { font-size: 1.25rem; }
.tampon-corps p { color: var(--muted); font-size: 0.92rem; }
.tampon-qr { width: min(60vw, 220px); aspect-ratio: 1; border-radius: 12px; overflow: hidden; background: #fff; padding: 8px; }
.tampon-qr svg { width: 100%; height: 100%; display: block; }
.tampon-adresse { font-family: var(--font-mono); font-size: 0.85rem; color: var(--orange-2); word-break: break-all; }
.tampon-fermer { position: absolute; top: 0.6rem; right: 0.6rem; width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; color: var(--muted); border: 1px solid var(--line); }
.tampon-fermer svg { width: 18px; height: 18px; }
.tampon-fermer:hover { color: var(--text); border-color: var(--line-2); }
.tampon-actions { display: flex; gap: 0.6rem; flex-wrap: wrap; justify-content: center; }

/* ---------- 10. Pied ---------- */
.lab-pied { border-top: 1px solid var(--line); padding: 2rem 0 2.4rem; }
.lab-pied .container { display: flex; flex-wrap: wrap; gap: 0.8rem 1.6rem; justify-content: space-between; align-items: center; font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted-2); }
.lab-pied a { color: var(--muted); } .lab-pied a:hover { color: var(--orange-2); }
.lab-pied nav { display: flex; flex-wrap: wrap; gap: 0.6rem 1.4rem; }

/* ---------- 11. Toast (surprise « 21 ») ---------- */
.lab-toast { position: fixed; left: 50%; bottom: 2rem; transform: translate(-50%, 30px); z-index: 80; padding: 0.9rem 1.3rem; border-radius: 999px;
  background: var(--orange); color: #1A0F00; font-family: var(--font-display); font-weight: 700; letter-spacing: -0.01em; opacity: 0; pointer-events: none;
  transition: opacity 0.4s var(--ease), transform 0.5s var(--ease); box-shadow: var(--shadow-orange); white-space: nowrap; }
.lab-toast.on { opacity: 1; transform: translate(-50%, 0); }

/* ---------- 12. Sans JavaScript / mouvement réduit ---------- */
html:not(.js) .pin { position: static; height: auto; }
html:not(.js) .acte--traversee, html:not(.js) .acte--compte, html:not(.js) .acte--particules { height: auto; }
html:not(.js) .escale { position: static; opacity: 1; transform: none; margin-top: 1rem; }
html:not(.js) .lab-calque, html:not(.js) .lab-curseur, html:not(.js) .lab-btn--tactile { display: none; }
@media (prefers-reduced-motion: reduce) {
  .hero-bloc .vivant, .hero-indices .fleche { animation: none; }
  .escale, .dollars-texte, .lab-legende, .lab-curseur, .lab-toast { transition: none; }
}