:root {
  --clr-bg1: #0d0d1a;
  --clr-bg2: #1a1630;
  --clr-primary: #00d8ff;
  --clr-accent: #ff00ff;
  --duration: 0.6s;
  --easing: cubic-bezier(0.23, 1, 0.32, 1);
}

/* Reset + base */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  background: linear-gradient(135deg, var(--clr-bg1), var(--clr-bg2));
  background-size: 400% 400%;
  animation: bgShift 20s ease infinite;
  color: #eee;
  overflow: hidden;
  position: relative;
  min-height: 100vh;
}

/* Animations */
@keyframes bgShift {
  0%,100% { background-position: 0% 50%; }
  50%     { background-position: 100% 50%; }
}
@keyframes shine {
  0% { left: -100%; }
  100% { left: 200%; }
}
@keyframes pulseBg {
  0%,100% { transform: scale(1); opacity: 0.7; }
  50%     { transform: scale(1.2); opacity: 0.4; }
}
@keyframes fadeInUp { to { opacity: 1; transform: translateY(0); } }
@keyframes popIn    { to { opacity: 1; transform: scale(1); } }

/* Header */
header {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 64px;
  backdrop-filter: blur(12px);
  background: rgba(10,10,30,0.75);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  z-index: 1000;
}
.logo {
  font-size: 1.4rem;
  font-weight: 700;
  text-transform: uppercase;
  background: linear-gradient(90deg, var(--clr-primary), var(--clr-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
  overflow: hidden;
}
.logo::after {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: rgba(255,255,255,0.1);
  transform: skewX(-20deg);
  animation: shine 2.5s ease infinite;
}
nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
}
nav a {
  position: relative;
  font-weight: 600;
  color: #bbb;
  padding: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  font-size: 0.95rem;
  background: linear-gradient(90deg, var(--clr-primary), var(--clr-accent));
  background-size: 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  transition: color 0.4s ease-in-out;
}
nav a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: linear-gradient(90deg, var(--clr-primary), var(--clr-accent));
  transition: width 0.4s ease-in-out;
  border-radius: 1px;
}
nav a:hover {
  color: #fff;
  background-position: 100% 0;
}
nav a:hover::after {
  width: 100%;
}

/* Hero section */
.hero {
  position: relative;
  margin-top: 64px;
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 0 1rem;
}
.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: radial-gradient(circle at 50% 50%, rgba(0,216,255,0.2), transparent 70%);
  animation: pulseBg 8s ease-in-out infinite;
  z-index: 0;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  transition: opacity 0.6s var(--easing);
}
.hero-content.hidden {
  opacity: 0;
  pointer-events: none;
}
.hero-content p {
  font-size: clamp(1rem, 3vw, 1.25rem);
  color: var(--clr-primary);
  margin-bottom: 2rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp var(--duration) 0.6s forwards;
}
.hero-content .btn {
  background: var(--clr-primary);
  color: #111;
  padding: 0.75rem 2rem;
  border: none;
  border-radius: 4px;
  font-weight: 600;
  cursor: pointer;
  opacity: 0;
  transform: scale(0.9);
  animation: popIn var(--duration) 0.8s forwards;
  transition: transform 0.3s, background 0.3s;
}
.hero-content .btn:hover {
  background: var(--clr-accent);
  transform: scale(1.05);
}
#btn-next {
  display: none;
  margin-top: 1rem;
  opacity: 0;
  transition: opacity 0.5s ease;
}
.hero-simulation {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 1;
  pointer-events: none;
}
.hero-simulation canvas {
  display: block;
  width: 100%; height: 100%;
}

/* Volet hyperparamètres */
.controls-panel {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  width: min(380px, 92vw);
  backdrop-filter: blur(16px);
  background: rgba(15, 15, 35, 0.65);
  border: 1px solid rgba(0,216,255,0.2);
  box-shadow: 0 10px 30px rgba(0,0,0,0.35), inset 0 0 0 1px rgba(255,0,255,0.08);
  border-radius: 12px;
  padding: 1rem;
  z-index: 1001;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--duration) var(--easing), transform var(--duration) var(--easing);
  pointer-events: none;
}
.controls-panel.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.controls-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: .75rem;
}
.controls-header h3 {
  font-size: 1.05rem;
  letter-spacing: 0.4px;
  background: linear-gradient(90deg, var(--clr-primary), var(--clr-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.chips { display: flex; gap: .5rem; }
.chip {
  padding: .25rem .5rem;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 999px;
  font-size: .85rem;
  color: #ddd;
}

.controls-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: .75rem;
  margin-bottom: .75rem;
}
.control-label {
  font-size: .85rem;
  color: #bbb;
  letter-spacing: 0.3px;
}

/* Inputs range stylés */
.controls-panel input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, rgba(0,216,255,0.45), rgba(255,0,255,0.45));
  border-radius: 999px;
  outline: none;
}
.controls-panel input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--clr-primary);
  box-shadow: 0 0 0 4px rgba(0,216,255,0.15);
  transition: transform .2s ease, border-color .2s ease;
}
.controls-panel input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.05);
  border-color: var(--clr-accent);
}

.control-toggle { display: flex; align-items: center; gap: .5rem; }

/* Boutons globaux (même esprit que .hero-content .btn) */
.btn {
  background: var(--clr-primary);
  color: #111;
  padding: 0.6rem 1rem;
  border: none;
  border-radius: 6px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.25s, background 0.25s, box-shadow 0.25s;
}
.btn:hover {
  background: var(--clr-accent);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(255,0,255,0.25);
}
.btn-ghost {
  background: transparent;
  color: #ddd;
  border: 1px solid rgba(255,255,255,0.15);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.06);
}

/* Assurer que le bouton Étape suivante apparaît après lancement */
#btn-next { display: none; }
#btn-next.visible { display: inline-block; }

/* Styles pour le groupe de radio-buttons “Choisir une porte” */

.gate-selector {
  margin: 1rem 0;
  padding: 1rem;
  background: rgba(15, 15, 35, 0.75);
  border: 1px solid rgba(0, 216, 255, 0.2);
  border-radius: 8px;
}

.gate-selector legend {
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--clr-primary);
  margin-bottom: 0.75rem;
}

.gate-selector label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  cursor: pointer;
  font-size: 0.9rem;
  color: #ddd;
  transition: color 0.3s;
}

.gate-selector label:hover {
  color: #fff;
}

.gate-selector input[type="radio"] {
  /* cache le contrôle natif sur certains navigateurs, mais conserve l’accessibilité */
  -webkit-appearance: none;
     -moz-appearance: none;
          appearance: none;
  width: 1.1rem;
  height: 1.1rem;
  border: 2px solid var(--clr-primary);
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
  transition:
    background 0.3s var(--easing),
    border-color 0.3s var(--easing),
    transform 0.2s;
  position: relative;
}

.gate-selector input[type="radio"]::after {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  width: 0.5rem; height: 0.5rem;
  background: transparent;
  border-radius: 50%;
  transform: translate(-50%, -50%) scale(0);
  transition: background 0.3s var(--easing),
              transform 0.3s var(--easing);
}

.gate-selector input[type="radio"]:checked {
  border-color: var(--clr-accent);
  background: var(--clr-accent);
}

.gate-selector input[type="radio"]:checked::after {
  background: #fff;
  transform: translate(-50%, -50%) scale(1);
}

.gate-selector input[type="radio"]:hover {
  transform: scale(1.1);
  border-color: var(--clr-primary);
}

.gate-selector {
  margin: 0.75rem 0;
  padding: 0.75rem;
  background: rgba(15, 15, 35, 0.65);
  border: 1px solid rgba(0, 216, 255, 0.15);
  border-radius: 10px;
}

.gate-selector legend {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--clr-primary);
  margin-bottom: 0.5rem;
}

.gate-options {
  display: flex;
  gap: 0.5rem;
  justify-content: space-between;
}

.gate-options input[type="radio"] {
  display: none;
}

.gate-options label {
  padding: 0.4rem 0.8rem;
  font-size: 0.75rem;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #ccc;
  cursor: pointer;
  transition: all 0.25s var(--easing);
  text-align: center!important;
  flex: 1;
}

.gate-options label:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border-color: var(--clr-primary);
}

.gate-options input[type="radio"]:checked + label {
  background: linear-gradient(90deg, var(--clr-primary), var(--clr-accent));
  color: #111;
  font-weight: 700;
  box-shadow: 0 0 8px rgba(0, 216, 255, 0.25);
  border-color: transparent;
}

/* Volet Informations — fullscreen overlay */
.info-panel {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  padding: 4rem 2rem;
  background: rgba(15, 15, 35, 0.75);
  backdrop-filter: blur(8px);
  transform: translateY(-100%);
  transition: transform 0.4s ease;
  z-index: 1001;
  overflow-y: auto;
  color: #eee;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.info-panel.visible {
  transform: translateY(0);
}

/* Conteneur du contenu — sans bloc de fond */
.info-panel .info-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 0;            /* plus de padding intérieur coloré */
  background: none;      /* suppression du fond derrière le texte */
}

/* Titre */
.info-panel h2 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  background: linear-gradient(90deg, var(--clr-primary), var(--clr-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Paragraphes */
.info-panel p {
  margin-bottom: 1rem;
  line-height: 1.5;
}

/* Liste */
.info-panel ul {
  list-style: disc inside;
  margin-bottom: 1.5rem;
}
.info-panel ul li {
  margin-bottom: 0.5rem;
}

/* Bouton fermer */
.info-panel .info-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: transparent;
  border: none;
  font-size: 2.4rem;
  color: #ccc;
  cursor: pointer;
  transition: color 0.2s;
}
.info-panel .info-close:hover {
  color: #fff;
}


/* Scrollbar personnalisé pour .info-panel */

/* Firefox */
.info-panel {
  scrollbar-width: thin;
  scrollbar-color: var(--clr-accent) rgba(15, 15, 35, 0.2);
}

/* WebKit (Chrome, Edge, Safari) */
.info-panel::-webkit-scrollbar {
  width: 8px;
}

.info-panel::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}

.info-panel::-webkit-scrollbar-thumb {
  background: linear-gradient(90deg, var(--clr-primary), var(--clr-accent));
  border-radius: 4px;
  box-shadow: inset 0 0 2px rgba(0, 0, 0, 0.5);
  transition: background 0.3s;
}

.info-panel::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(90deg, var(--clr-accent), var(--clr-primary));
}

.info-panel::-webkit-scrollbar-corner {
  background: transparent;
}
/* Panneau glassmorphism transparent */
.controls-panel {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  width: 340px;
  padding: 1rem;
  backdrop-filter: blur(12px);
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 12px;
  color: #eee;
  transition: opacity var(--duration) var(--easing), transform var(--duration) var(--easing);
  opacity: 0; transform: translateY(12px);
}
.controls-panel.visible {
  opacity: 1; transform: translateY(0);
}

/* Onglets */
.controls-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}
.tab-btn {
  flex: 1;
  background: rgba(255,255,255,0.1);
  border: none;
  padding: 0.6rem 0;
  font-size: 0.9rem;
  color: #ccc;
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  transition: background 0.3s, color 0.3s;
}
.tab-btn.active,
.tab-btn:hover {
  background: rgba(255,255,255,0.2);
  color: #fff;
}
.tab-btn.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 2px;
  background: var(--clr-primary);
  border-radius: 1px;
}

/* Contenus */
.tab-content { display: none; }
.tab-content.active { display: block; }

/* Groupes de boutons */
.state-buttons,
.gate-buttons {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: center;
}
.state-btn,
.gate-btn {
  flex: 1 1 calc(50% - 0.75rem);
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 8px;
  padding: 0.65rem 1rem;
  font-size: 0.85rem;
  color: #ddd;
  cursor: pointer;
  transition: background 0.4s, box-shadow 0.4s, transform 0.2s;
}
#id-R {
  flex: 1 1 calc(33% - 0.75rem)!important;
}
.state-btn:hover,
.gate-btn:hover {
  background: var(--clr-primary);
  color: #111;
  box-shadow: 0 6px 16px rgba(0,216,255,0.4);
  transform: translateY(-2px);
}

/* Slider simple */
.control {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-top: 0.75rem;
}
.control label {
  font-size: 0.85rem;
  color: #bbb;
}
.control input[type="range"] {
  -webkit-appearance: none;
  height: 6px; border-radius: 999px;
  background: rgba(0,216,255,0.45);
  outline: none;
}
.control input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px; height: 16px; border-radius: 50%;
  background: #fff; border: 2px solid var(--clr-primary);
  transition: transform 0.2s, border-color 0.2s;
}
.control input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.1); border-color: var(--clr-accent);
}