/* =================================================================
   Martin BTC — Le Lab nº 2 : « 9 300 km », le road trip USA  (page /lab-usa)
   Chargée après css/style.css et css/lab.css (bandeau, kicker, boutons,
   pied de page et toast viennent de lab.css).

   Mise en page : une carte collée à l'écran (gauche sur grand écran, haut
   sur téléphone) et une colonne d'étapes qui défile à côté. js/lab-usa.js
   lit la position des étapes dans la fenêtre pour faire avancer la route.
   ================================================================= */

/* ---------- 1. Scène ---------- */
.usa-scene { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) minmax(360px, 460px); gap: 0; }
.usa-carte-col { position: sticky; top: 0; height: 100vh; height: 100svh; overflow: hidden; }
.usa-carte { position: absolute; inset: 0; }
.usa-carte svg { width: 100%; height: 100%; display: block; }
.usa-flux { padding: 0 clamp(1.1rem, 4vw, 2.6rem) 0 clamp(1.4rem, 3vw, 2.6rem); }
@media (max-width: 900px) {
  .usa-scene { grid-template-columns: minmax(0, 1fr); }
  .usa-carte-col { height: 46vh; height: 46svh; z-index: 2; border-bottom: 1px solid var(--line); background: var(--bg); }
  .usa-flux { padding-top: 1rem; }
  /* La carte reste collee jusqu'au bas de la scene : en bas de page, elle
     recouvrait la fin du recit et ses boutons (320 px, paysage). La section
     de fin passe donc par-dessus la carte, comme un rideau. L'ombre etend le
     fond sur toute la largeur, clip-path la limite a la hauteur du bloc. */
  html.js .usa-fin { position: relative; z-index: 3; background: var(--bg); box-shadow: 0 0 0 100vmax var(--bg); clip-path: inset(0 -100vmax); }
}

/* ---------- 2. La carte SVG ---------- */
.usa-fond { fill: #0d0e12; }
.etat { fill: #14151b; stroke: rgba(255, 255, 255, 0.11); stroke-width: 0.8; stroke-linejoin: round; transition: fill 0.6s var(--ease), stroke 0.6s; }
.etat.vu { fill: rgba(247, 147, 26, 0.13); stroke: rgba(247, 147, 26, 0.45); }
.etat.ici { fill: rgba(247, 147, 26, 0.27); stroke: var(--orange); stroke-width: 1.2; }
.route-fond { fill: none; stroke: rgba(255, 255, 255, 0.14); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; stroke-dasharray: 2 5; }
.route-halo { fill: none; stroke: rgba(247, 147, 26, 0.22); stroke-width: 6; stroke-linecap: round; stroke-linejoin: round; }
.route-faite { fill: none; stroke: var(--orange-2); stroke-width: 2.6; stroke-linecap: round; stroke-linejoin: round; }
.pin circle.p { fill: #1b1e25; stroke: rgba(255, 255, 255, 0.35); stroke-width: 1.2; transition: fill 0.4s, stroke 0.4s, r 0.4s; }
.pin.vu circle.p { fill: var(--orange); stroke: #1a0f00; }
.pin.ici circle.p { fill: var(--orange-2); stroke: var(--text); stroke-width: 1.6; }
.pin text { font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.08em; fill: rgba(244, 241, 234, 0); text-transform: uppercase; transition: fill 0.4s; pointer-events: none; }
.pin.ici text { fill: var(--text); }
/* Les étiquettes restent muettes sauf pour l'étape courante et au survol :
   affichées toutes à la fois, elles se chevauchaient là où les étapes sont serrées. */
.pin { cursor: pointer; }
.pin:hover text { fill: var(--text); }
.voiture-halo { fill: rgba(247, 147, 26, 0.22); }
.voiture { fill: var(--text); stroke: var(--orange); stroke-width: 1.5; }
@media (prefers-reduced-motion: reduce) { .etat, .pin circle.p, .pin text { transition: none; } }

/* ---------- 3. L'affichage sur la carte (HUD) ---------- */
.usa-hud { position: absolute; inset: 0; pointer-events: none; padding: clamp(4.6rem, 10vh, 6rem) clamp(1rem, 3vw, 1.8rem) clamp(1rem, 3vh, 1.6rem); display: grid; grid-template-rows: auto 1fr auto; }
.usa-hud > * { pointer-events: auto; }
.usa-compteurs { display: flex; gap: clamp(1rem, 3vw, 2.2rem); flex-wrap: wrap; align-items: flex-end; }
.usa-compteurs div { display: grid; gap: 0.1rem; }
.usa-compteurs b { font-family: var(--font-display); font-weight: 700; font-size: clamp(1.6rem, 3.6vw, 2.8rem); letter-spacing: -0.03em; line-height: 1; font-variant-numeric: tabular-nums; color: var(--text); }
.usa-compteurs b small { font-size: 0.5em; color: var(--muted); font-weight: 500; letter-spacing: 0; margin-left: 0.2em; }
.usa-compteurs span { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--orange); }
.usa-bas { display: flex; justify-content: space-between; align-items: flex-end; gap: 1rem; }
.usa-ou { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.usa-ou b { display: block; font-family: var(--font-display); font-size: clamp(1rem, 2vw, 1.4rem); letter-spacing: -0.02em; color: var(--text); text-transform: none; font-weight: 600; margin-top: 0.2rem; }
.usa-ep { display: inline-block; margin-top: 0.5rem; padding: 0.25rem 0.6rem; border-radius: 999px; border: 1px solid var(--orange-line); color: var(--orange-2); font-size: 0.68rem; }
@media (max-width: 900px) {
  .usa-hud { padding: 4.2rem 0.9rem 0.8rem; }
  .usa-compteurs b { font-size: 1.35rem; }
  .usa-compteurs span { font-size: 0.6rem; }
  .usa-ou b { font-size: 0.95rem; }
  .usa-bas .lab-btn { padding: 0.45rem 0.8rem; min-height: 44px; }
}

/* ---------- 4. Le rail des étapes ---------- */
.usa-rail { position: absolute; right: clamp(0.8rem, 2vw, 1.4rem); top: 50%; transform: translateY(-50%); display: grid; gap: 0.3rem; max-height: 86vh; overflow: hidden; }
.usa-rail a { display: flex; align-items: center; justify-content: flex-end; gap: 0.5rem; text-decoration: none; min-height: 18px; }
.usa-rail a span { font-family: var(--font-mono); font-size: 0.64rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); opacity: 0; transform: translateX(6px); transition: opacity 0.25s, transform 0.25s var(--ease), color 0.25s; white-space: nowrap; }
.usa-rail a i { width: 8px; height: 8px; border-radius: 50%; background: rgba(255, 255, 255, 0.22); border: 1px solid transparent; transition: background 0.3s, transform 0.3s var(--ease), box-shadow 0.3s; flex-shrink: 0; }
.usa-rail a.vu i { background: var(--orange); }
.usa-rail a.ici i { background: var(--orange-2); transform: scale(1.5); box-shadow: 0 0 0 4px rgba(247, 147, 26, 0.2); }
.usa-rail a.ici span, .usa-rail:hover a span { opacity: 1; transform: none; }
.usa-rail a.ici span { color: var(--text); }
@media (max-width: 900px) { .usa-rail { display: none; } }

/* ---------- 5. Les étapes ---------- */
.etape { min-height: 78vh; display: flex; align-items: center; padding: 2rem 0; }
.etape > div { width: 100%; }
.etape-illus { display: block; width: 100%; aspect-ratio: 4 / 3; border-radius: var(--radius); border: 1px solid var(--line-2); background: var(--surface); overflow: hidden; box-shadow: var(--shadow); transition: border-color 0.5s, transform 0.6s var(--ease), opacity 0.5s; }
.etape-illus svg { width: 100%; height: 100%; display: block; }
.etape-meta { margin-top: 1rem; font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--orange); }
.etape-meta .sep { color: var(--muted-2); margin: 0 0.4rem; }
.etape h2 { font-size: clamp(1.35rem, 2.2vw, 1.75rem); letter-spacing: -0.025em; margin-top: 0.45rem; }
.etape p { color: var(--muted); margin-top: 0.7rem; font-size: 0.98rem; }
.etape-lien { display: inline-flex; align-items: center; gap: 0.45rem; margin-top: 1rem; font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--orange-2); padding: 0.55rem 0.9rem; border: 1px solid var(--orange-line); border-radius: 999px; transition: background 0.25s, color 0.25s, border-color 0.25s; min-height: 40px; }
.etape-lien:hover, .etape-lien:focus-visible { background: var(--orange-soft); color: var(--text); border-color: var(--orange); }
.etape-lien svg { width: 1em; height: 1em; }
.etape-lien.off { color: var(--muted-2); border-color: var(--line); pointer-events: none; }
.etape:not(.ici) .etape-illus { opacity: 0.55; transform: scale(0.985); }
.etape.ici .etape-illus { border-color: var(--orange-line); }
.etape.ici .etape-meta { color: var(--orange-2); }
@media (max-width: 900px) {
  .etape { min-height: 0; padding: 1.6rem 0; scroll-margin-top: calc(46svh + 12px); }   /* un point de la carte touché amène l'étape juste sous la carte, pas dessous */
  .etape:not(.ici) .etape-illus { opacity: 0.85; transform: none; }
}

/* ---------- 6. Intro et fin de colonne ---------- */
.usa-intro { min-height: 100vh; min-height: 100svh; display: flex; align-items: center; padding: clamp(5rem, 12vh, 7rem) 0 2rem; }
.usa-intro h1 { font-size: clamp(3rem, 7vw, 5.4rem); font-weight: 700; letter-spacing: -0.045em; line-height: 0.95; margin-top: 0.8rem; }
.usa-intro h1 small { display: block; font-size: 0.34em; font-weight: 600; letter-spacing: -0.02em; color: var(--orange); margin-top: 0.4rem; }
.usa-intro .lead { margin-top: 1.2rem; }
.usa-videos { display: grid; gap: 0.5rem; margin-top: 1.6rem; }
.usa-videos a { display: grid; grid-template-columns: 72px 1fr auto; align-items: center; gap: 0.8rem; padding: 0.5rem; border-radius: 12px; border: 1px solid var(--line); background: rgba(255, 255, 255, 0.02); transition: border-color 0.25s, background 0.25s; }
.usa-videos a:hover { border-color: var(--orange-line); background: var(--orange-soft); }
.usa-videos img { width: 72px; height: 40px; object-fit: cover; border-radius: 6px; background: var(--surface-2); }
.usa-videos b { display: block; font-family: var(--font-display); font-size: 0.92rem; font-weight: 600; letter-spacing: -0.01em; }
.usa-videos span { display: block; font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted-2); margin-top: 0.15rem; }
.usa-videos em { font-style: normal; font-family: var(--font-mono); font-size: 0.7rem; color: var(--muted-2); }
.usa-indices { margin-top: 1.6rem; display: flex; flex-wrap: wrap; gap: 0.6rem 1.6rem; font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted-2); }
.usa-indices .fleche { display: inline-block; animation: lab-saut 1.8s infinite; margin-right: 0.4rem; }
.usa-fin { min-height: 70vh; display: flex; align-items: center; padding: 2rem 0 4rem; }
.usa-fin h2 { font-size: clamp(1.8rem, 3.6vw, 2.6rem); letter-spacing: -0.03em; margin-top: 0.6rem; }
.usa-fin .lead { margin-top: 1rem; }
.usa-bilan { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.6rem; margin-top: 1.4rem; }
.usa-bilan div { padding: 0.9rem 1rem; border-radius: 12px; border: 1px solid var(--line); background: rgba(255, 255, 255, 0.02); }
.usa-bilan b { display: block; font-family: var(--font-display); font-size: 1.5rem; font-weight: 700; letter-spacing: -0.03em; }
.usa-bilan span { display: block; font-family: var(--font-mono); font-size: 0.64rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted-2); margin-top: 0.2rem; }
.usa-fin .flex { gap: 0.7rem; margin-top: 1.6rem; }
@media (max-width: 900px) {
  .usa-intro { min-height: 0; padding-top: 2rem; }
  .usa-intro h1 { font-size: clamp(2.6rem, 11vw, 3.6rem); }
  .usa-bilan { grid-template-columns: 1fr 1fr; }
}

/* ---------- 7. Sans JavaScript ---------- */
html:not(.js) .usa-carte-col { position: static; height: auto; aspect-ratio: 1000 / 620; }
html:not(.js) .usa-hud, html:not(.js) .usa-rail { display: none; }
html:not(.js) .etape:not(.ici) .etape-illus { opacity: 1; transform: none; }