:root {
  --bg: #0a0a14;
  --bg-soft: #11111e;
  --bg-card: rgba(22, 22, 40, 0.72);
  --fg: #e9ecf1;
  --fg-muted: #a8acbf;
  --accent: #ffb74d;
  --accent-2: #82b1ff;
  --accent-3: #b39ddb;
  --line: rgba(42, 42, 64, 0.7);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  line-height: 1.5;
  font-size: 16px;
  overflow: hidden;
  height: 100vh;
  width: 100vw;
}

#scene {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
  z-index: 1;
}

/* Topbar */
.v2-topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  z-index: 10;
  background: linear-gradient(180deg, rgba(10, 10, 20, 0.75) 0%, transparent 100%);
  backdrop-filter: blur(4px);
}
.v2-back {
  color: var(--accent-2);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: all 0.2s ease;
}
.v2-back:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.v2-plan-label {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  font-size: 1.05rem;
}
.v2-plan-tag {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-muted);
  border: 1px solid var(--line);
  padding: 0.15rem 0.55rem;
  border-radius: 4px;
}
.v2-plan-label strong {
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.02em;
}
.v2-plan-sub {
  color: var(--fg-muted);
  font-size: 0.95rem;
}
.v2-plan-sub em {
  color: var(--accent);
  font-style: normal;
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  font-size: 0.9em;
}

.v2-phase-label {
  position: fixed;
  top: 6.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 11;
  padding: 0.5rem 1.6rem;
  font-size: 2.4rem;
  letter-spacing: 0.06em;
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  font-weight: 500;
  text-align: center;
  white-space: nowrap;
  transition: none;
  pointer-events: none;
}
.v2-phase-label.dark {
  color: #b39ddb;
  text-shadow: 0 0 18px rgba(179, 157, 219, 0.35);
}
.v2-phase-label.light {
  color: var(--accent);
  text-shadow: 0 0 22px rgba(255, 183, 77, 0.55);
}
@media (max-width: 980px) {
  .v2-phase-label { font-size: 1.4rem; padding: 0.4rem 1rem; top: 5.5rem; }
}

/* Labels t=x et t=x+1 — suivent les markers en 3D */
.v2-marker-label {
  position: fixed;
  pointer-events: none;
  z-index: 12;
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  color: var(--accent);
  background: rgba(20, 16, 30, 0.82);
  border: 1px solid var(--accent);
  border-radius: 6px;
  padding: 0.32rem 0.65rem;
  white-space: nowrap;
  transform: translate(-50%, calc(-100% - 18px));
  box-shadow: 0 0 14px rgba(255, 183, 77, 0.25);
  transition: opacity 0.18s ease;
}
.v2-marker-label[hidden] {
  display: none;
}
.v2-marker-label::after {
  content: '';
  position: absolute;
  bottom: -7px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 7px solid var(--accent);
}
.v2-marker-label::before {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 6px solid rgba(20, 16, 30, 0.82);
  z-index: 1;
}
.v2-marker-label.projected {
  color: #b39ddb;
  border-color: rgba(179, 157, 219, 0.65);
  box-shadow: 0 0 12px rgba(179, 157, 219, 0.2);
  opacity: 0.7;
}
.v2-marker-label.projected::after {
  border-top-color: rgba(179, 157, 219, 0.65);
}

/* Description panel */
.v2-description {
  position: fixed;
  left: 1.5rem;
  bottom: 4rem;
  max-width: 360px;
  padding: 1.3rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 12px;
  backdrop-filter: blur(10px);
  z-index: 9;
  font-size: 0.92rem;
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.v2-description h2 {
  margin: 0 0 0.6rem;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}
.v2-description p {
  margin: 0 0 0.6rem;
  color: var(--fg);
}
.v2-description p:last-child { margin-bottom: 0; }
.v2-description em {
  color: var(--accent);
  font-style: normal;
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  font-size: 0.9em;
}
.v2-hint {
  color: var(--fg-muted) !important;
  font-size: 0.85rem;
  border-top: 1px solid var(--line);
  padding-top: 0.6rem;
  margin-top: 0.8rem !important;
}
.v2-description.hidden {
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
}

/* Tooltip (hover) */
.v2-tooltip {
  position: fixed;
  pointer-events: none;
  background: var(--bg-card);
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: 0.55rem 0.85rem;
  backdrop-filter: blur(10px);
  z-index: 20;
  font-size: 0.88rem;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 160px;
  transform: translate(12px, 12px);
  transition: opacity 0.15s ease;
}
.v2-tooltip[hidden] { display: none; }
.v2-tooltip-tag {
  font-size: 0.65rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}
.v2-tooltip strong {
  color: var(--fg);
  font-weight: 600;
}
.v2-tooltip span:last-child {
  color: var(--fg-muted);
  font-size: 0.8rem;
}

/* Statusbar */
.v2-statusbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.7rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 10;
  font-size: 0.75rem;
  color: var(--fg-muted);
  letter-spacing: 0.08em;
  background: linear-gradient(0deg, rgba(10, 10, 20, 0.75) 0%, transparent 100%);
}
.v2-toggle {
  cursor: pointer;
  color: var(--accent-2);
  user-select: none;
}
.v2-toggle:hover { color: var(--accent); }

@media (max-width: 720px) {
  .v2-topbar { padding: 0.7rem 1rem; flex-wrap: wrap; gap: 0.7rem; }
  .v2-plan-label { font-size: 0.95rem; }
  .v2-plan-sub { display: none; }
  .v2-description {
    left: 1rem;
    right: 1rem;
    bottom: 3.5rem;
    max-width: none;
    font-size: 0.85rem;
    padding: 1rem 1.1rem;
  }
  .v2-statusbar { padding: 0.5rem 1rem; font-size: 0.7rem; }
}

/* =====================================================
   COQUILLE DE NAVIGATION — header, switch FR/EN, nav, accueil
   ===================================================== */

/* Pousse le switch de langue à droite de la topbar */
.v2-topbar .v2-lang { margin-left: auto; }

/* Switch FR / EN */
.v2-lang {
  display: flex;
  gap: 0.25rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.15rem;
}
.v2-lang-btn {
  appearance: none;
  background: transparent;
  border: none;
  color: var(--fg-muted);
  font: inherit;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.18s ease, background 0.18s ease;
}
.v2-lang-btn:hover { color: var(--fg); }
.v2-lang-btn.active {
  color: var(--bg);
  background: var(--accent);
  font-weight: 600;
}

/* Bascule de langue : on n'affiche jamais les deux à la fois */
.lang-fr[hidden], .lang-en[hidden] { display: none; }

/* Nav précédent / suivant */
.v2-plannav {
  position: fixed;
  bottom: 3.2rem;
  right: 1.5rem;
  display: flex;
  gap: 0.6rem;
  z-index: 9;
}
.v2-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--accent-2);
  text-decoration: none;
  font-size: 0.85rem;
  padding: 0.45rem 0.9rem;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 999px;
  backdrop-filter: blur(8px);
  transition: border-color 0.18s ease, color 0.18s ease, opacity 0.18s ease;
}
.v2-nav-btn:hover { border-color: var(--accent); color: var(--accent); }
.v2-nav-btn.disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
  color: var(--fg-muted);
}
.v2-nav-soon {
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-muted);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0.05rem 0.35rem;
}

/* ----- Écran d'accueil V2 ----- */
body.v2-home {
  overflow: auto;
}
.v2-home-main {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6rem 1.5rem 5rem;
  background:
    radial-gradient(1200px 700px at 50% -10%, rgba(255, 183, 77, 0.06), transparent 60%),
    radial-gradient(900px 600px at 80% 110%, rgba(130, 177, 255, 0.06), transparent 60%),
    var(--bg);
}
.v2-home-card {
  max-width: 640px;
  width: 100%;
}
.v2-home-card h1 {
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  line-height: 1.1;
  margin: 0 0 1.2rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.v2-home-lede {
  font-size: 1.05rem;
  color: var(--fg-muted);
  margin: 0 0 2rem;
}
.v2-home-lede strong { color: var(--fg); }
.v2-home-choices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.v2-home-choice {
  appearance: none;
  text-align: left;
  font: inherit;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1.1rem 1.3rem;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--fg);
  text-decoration: none;
  cursor: pointer;
  transition: border-color 0.18s ease, transform 0.18s ease, background 0.18s ease;
}
.v2-home-choice:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.v2-home-choice.primary {
  border-color: rgba(255, 183, 77, 0.5);
  background: linear-gradient(180deg, rgba(255, 183, 77, 0.08), var(--bg-card));
}
.v2-home-choice-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--accent);
}
.v2-home-choice-sub { font-size: 0.85rem; color: var(--fg-muted); }
.v2-home-choice.open { border-color: var(--accent); }

/* Liste des plans (accès libre) */
.v2-plan-list-wrap {
  margin-top: 1.5rem;
  border-top: 1px solid var(--line);
  padding-top: 1.2rem;
}
.v2-plan-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.v2-plan-item.transverse { margin-top: 0.5rem; }
.v2-plan-link {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.55rem 0.8rem;
  border-radius: 8px;
  text-decoration: none;
  color: var(--fg);
  border: 1px solid transparent;
  transition: border-color 0.15s ease, background 0.15s ease;
}
a.v2-plan-link:hover { border-color: var(--accent); background: rgba(255, 183, 77, 0.05); }
.v2-plan-link.disabled { opacity: 0.5; cursor: default; }
.v2-plan-code {
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  font-size: 0.82rem;
  color: var(--accent);
  min-width: 6.5rem;
}
.v2-plan-title { color: var(--fg-muted); font-size: 0.9rem; }
.v2-home-note { font-size: 0.82rem; color: var(--fg-muted); margin: 1rem 0 0; }

@media (max-width: 560px) {
  .v2-home-choices { grid-template-columns: 1fr; }
  .v2-plannav { right: 1rem; left: 1rem; justify-content: space-between; }
  .v2-plan-code { min-width: 5.5rem; }
}

/* Fondu d'entrée — CSS pur, aucune dépendance JS */
@keyframes v2-fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: none; }
}
.v2-topbar,
.v2-description,
.v2-plannav,
.v2-home-card { animation: v2-fade-in 0.5s ease both; }
.v2-description { animation-delay: 0.1s; }
.v2-plannav { animation-delay: 0.15s; }

@media (prefers-reduced-motion: reduce) {
  .v2-topbar, .v2-description, .v2-plannav, .v2-home-card { animation: none; }
}

/* =====================================================
   MENU DES CONCEPTS — galerie de cartes (accueil)
   Image pleine atténuée + badge + titre ; explication au survol.
   ===================================================== */

.concept-menu {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 1rem;
  margin-top: 0.5rem;
}

.concept-card {
  position: relative;
  display: block;
  aspect-ratio: 3 / 4;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg-soft);
  text-decoration: none;
  isolation: isolate;
  transition: transform 0.4s cubic-bezier(0.2, 0.7, 0.2, 1),
              border-color 0.4s ease, box-shadow 0.4s ease;
}
.concept-card:hover,
.concept-card:focus-visible {
  transform: translateY(-5px);
  border-color: var(--accent);
  box-shadow: 0 20px 55px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 183, 77, 0.18);
}

.concept-card-media { position: absolute; inset: 0; z-index: -2; }
.concept-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
  filter: saturate(0.85) contrast(1.05);
  transition: transform 0.7s cubic-bezier(0.2, 0.7, 0.2, 1),
              opacity 0.45s ease, filter 0.45s ease;
}
.concept-card:hover .concept-card-media img,
.concept-card:focus-visible .concept-card-media img {
  transform: scale(1.07);
  opacity: 0.82;
  filter: saturate(1.12) contrast(1.05);
}

/* Voile dégradé : lisibilité + ambiance surréelle */
.concept-card-veil {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(120% 80% at 50% -10%, rgba(179, 157, 219, 0.12), transparent 60%),
    linear-gradient(180deg, rgba(10, 10, 20, 0.05) 0%, rgba(10, 10, 20, 0.55) 55%, rgba(10, 10, 20, 0.94) 100%);
}

.concept-card-body {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 0.45rem;
  padding: 1.1rem;
}
.concept-card-tag {
  align-self: flex-start;
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--accent);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.15rem 0.5rem;
  background: rgba(10, 10, 20, 0.5);
  backdrop-filter: blur(4px);
}
.concept-card-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--fg);
  line-height: 1.2;
  letter-spacing: -0.01em;
}
.concept-card-blurb {
  font-size: 0.85rem;
  color: var(--fg-muted);
  line-height: 1.45;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.45s ease, opacity 0.35s ease;
}
.concept-card:hover .concept-card-blurb,
.concept-card:focus-visible .concept-card-blurb {
  max-height: 6rem;
  opacity: 1;
}

/* Carte catégorie : chevron discret qui suggère un groupe à ouvrir */
.concept-card.is-category .concept-card-title::after {
  content: ' ▸';
  color: var(--accent);
}

@media (prefers-reduced-motion: reduce) {
  .concept-card, .concept-card-media img, .concept-card-blurb { transition: none; }
}