/* ============================================================
   Thème de site « Prisme » — chargé après style.css (thème Neurone)
   Reprend le thème Marp prisme : fond blanc lumineux, titres très gras,
   accent bleu électrique, surlignage citron, cartes en verre pastel.
   Activé dans cours.md :  theme_site: prisme
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;600&display=swap');

:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-2: #f4f6fb;
  --fg: #0b0d17;
  --text: #2a2f3d;
  --muted: #6b7280;
  --line: #e6e9f2;
  --dot: transparent;
  --accent: #3b63f3;
  --accent-fg: #3b63f3;
  --accent-soft: #edf1ff;
  --link: #3b63f3;
  --lime: #e4ec7c;
  --lime-ink: #0b0d17;
  --glass-1: linear-gradient(160deg, #e9e2ff 0%, #b9a8f7 45%, #6d7cf6 100%);
  --glass-2: linear-gradient(160deg, #eaf7ff 0%, #a8d8f0 55%, #6aa9d8 100%);
  --glass-3: linear-gradient(160deg, #fbfde8 0%, #e4ec7c 55%, #b9c94a 100%);
  --grad: linear-gradient(120deg, #6d7cf6 0%, #3b63f3 100%);
  --glow-1: rgba(185, 168, 247, 0.32);
  --glow-2: rgba(228, 236, 124, 0.32);
  --shadow: 0 14px 30px -22px rgba(11, 13, 23, 0.45);
  --shadow-lg: 0 26px 60px -30px rgba(11, 13, 23, 0.5);
  --stage-bg: #f4f6fb;
  --c-draft: #b45309;
  --font-body: 'Plus Jakarta Sans', 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-head: 'Plus Jakarta Sans', 'Inter', 'Segoe UI', system-ui, sans-serif;
  --radius: 20px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --bg: #0b0d17;
    --surface: #131726;
    --surface-2: #1a1f33;
    --fg: #ffffff;
    --text: #d6dae6;
    --muted: #8a92a8;
    --line: rgba(255, 255, 255, 0.11);
    --accent: #7c9bff;
    --accent-fg: #9bb2ff;
    --accent-soft: rgba(124, 155, 255, 0.14);
    --link: #9bb2ff;
    --glow-1: rgba(124, 92, 240, 0.4);
    --glow-2: rgba(228, 236, 124, 0.14);
    --shadow: 0 14px 30px -18px rgba(0, 0, 0, 0.8);
    --shadow-lg: 0 26px 60px -28px rgba(0, 0, 0, 0.9);
    --stage-bg: #070910;
    --c-draft: #e4ec7c;
    color-scheme: dark;
  }
}

:root[data-theme='dark'] {
  --bg: #0b0d17;
  --surface: #131726;
  --surface-2: #1a1f33;
  --fg: #ffffff;
  --text: #d6dae6;
  --muted: #8a92a8;
  --line: rgba(255, 255, 255, 0.11);
  --accent: #7c9bff;
  --accent-fg: #9bb2ff;
  --accent-soft: rgba(124, 155, 255, 0.14);
  --link: #9bb2ff;
  --glow-1: rgba(124, 92, 240, 0.4);
  --glow-2: rgba(228, 236, 124, 0.14);
  --shadow: 0 14px 30px -18px rgba(0, 0, 0, 0.8);
  --shadow-lg: 0 26px 60px -28px rgba(0, 0, 0, 0.9);
  --stage-bg: #070910;
  --c-draft: #e4ec7c;
  color-scheme: dark;
}

/* ---------- Base ---------- */
body {
  color: var(--text);
  background:
    radial-gradient(ellipse 45% 40% at 100% 0%, var(--glow-1), transparent 70%) no-repeat,
    radial-gradient(ellipse 35% 35% at 0% 100%, var(--glow-2), transparent 70%) no-repeat,
    var(--bg);
  background-attachment: fixed;
}

h1, h2, h3, h4, h5 { color: var(--fg); font-weight: 800; letter-spacing: -0.025em; }

.kicker {
  font-family: var(--font-body);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--muted);
}

/* ---------- Boutons ---------- */
.btn { font-family: var(--font-body); font-weight: 700; border-radius: 14px; }
.btn-primary { background: var(--fg); color: var(--bg); }
.btn-primary:hover { box-shadow: 0 10px 24px -12px rgba(59, 99, 243, 0.6); }
.icon-btn { border-radius: 14px; }

/* ---------- Barre du haut ---------- */
.topbar { background: color-mix(in srgb, var(--bg) 78%, transparent); }
.topbar::before { display: none; }
.brand-mark { border-radius: 11px; background: radial-gradient(circle, var(--lime) 0 5px, transparent 5.5px), var(--glass-1); }
.brand-text strong { font-weight: 800; }
.crumb { font-family: var(--font-body); font-weight: 600; }

/* ---------- Accueil ---------- */
.hero { padding: 88px 0 56px; }
.hero::before {
  inset: 56px max(24px, calc((100vw - var(--container)) / 2 + 24px)) auto auto;
  width: 240px;
  height: 300px;
  border-radius: 28px;
  background: var(--glass-1);
  transform: rotate(8deg);
  box-shadow: 0 30px 60px -30px rgba(109, 124, 246, 0.6);
  opacity: 0.95;
}
.hero::after {
  content: '';
  position: absolute;
  top: 150px;
  right: max(170px, calc((100vw - var(--container)) / 2 + 170px));
  width: 200px;
  height: 240px;
  border-radius: 26px;
  background: var(--glass-2);
  transform: rotate(-9deg);
  box-shadow: 0 30px 60px -30px rgba(106, 169, 216, 0.6);
  pointer-events: none;
  z-index: -1;
}
.hero { isolation: isolate; }
.hero .container { position: relative; }
.hero h1 {
  font-size: clamp(42px, 7vw, 78px);
  font-weight: 800;
  letter-spacing: -0.035em;
  background: none;
  -webkit-background-clip: border-box;
  background-clip: border-box;
  color: var(--fg);
  max-width: 720px;
}
.hero h1::after {
  content: '';
  display: block;
  width: 64px;
  height: 5px;
  margin-top: 20px;
  border-radius: 4px;
  background: var(--lime);
}
.hero-sub {
  display: inline-block;
  font-weight: 800;
  color: var(--lime-ink);
  background: linear-gradient(transparent 12%, var(--lime) 12%, var(--lime) 88%, transparent 88%);
  padding: 0 0.15em;
}

.section-title::after { background: var(--lime); height: 5px; }
.prose strong { color: var(--fg); background: linear-gradient(transparent 62%, var(--lime) 62%); }
:root[data-theme='dark'] .prose strong { color: var(--lime); background: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) .prose strong { color: var(--lime); background: none; }
}
.prose li::marker { color: var(--accent); }

.card {
  border-radius: 24px;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
}
.card::before { display: none; }
.card-num {
  display: inline-block;
  font-size: 22px;
  font-weight: 800;
  padding: 8px 14px;
  border-radius: 14px;
  background: var(--glass-1);
  -webkit-background-clip: border-box;
  background-clip: border-box;
  color: #fff;
}
.chapter-grid .card:nth-child(3n + 2) .card-num { background: var(--glass-2); }
.chapter-grid .card:nth-child(3n + 3) .card-num { background: var(--glass-3); color: var(--lime-ink); }
.card h3 { font-weight: 800; }
.card-actions a:hover { background: var(--accent-soft); color: var(--accent-fg); }
.chapter-grid .card.is-upcoming .card-num { background: var(--surface-2); color: var(--muted); }

.howto-grid > div { border-radius: 22px; background: color-mix(in srgb, var(--surface) 92%, transparent); }
.howto-icon { border-radius: 14px; background: var(--glass-1); color: #fff; }
.howto-grid > div:nth-child(3n + 2) .howto-icon { background: var(--glass-2); }
.howto-grid > div:nth-child(3n + 3) .howto-icon { background: var(--glass-3); color: var(--lime-ink); }
.howto-grid h3 { font-weight: 800; }

/* ---------- Page chapitre ---------- */
.chapter-head h1 { font-weight: 800; letter-spacing: -0.03em; }
.chapter-head h1::after {
  content: '';
  display: block;
  width: 56px;
  height: 5px;
  margin-top: 16px;
  border-radius: 4px;
  background: var(--lime);
}

.tabs { border-radius: 16px; background: var(--surface-2); border-color: transparent; }
.tab { font-family: var(--font-body); font-weight: 700; border-radius: 12px; }
.tab[aria-selected='true'] { background: var(--surface); color: var(--fg); box-shadow: 0 6px 16px -10px rgba(11, 13, 23, 0.4); }

.menu-panel { border-radius: 20px; }
.menu-item { border-radius: 12px; }
.menu-item .icon { color: var(--accent); }

.slides-view .marpit > svg { border-radius: 16px; }
.progress span { background: var(--accent); }
.counter { font-weight: 700; }

.chapter-nav-link { border-radius: 20px; }
.chapter-nav-link:hover { border-color: var(--accent); }

.tag { font-family: var(--font-body); font-weight: 700; }

@media (max-width: 900px) {
  .hero::before, .hero::after { display: none; }
}