*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  position: relative;
  font-family: var(--font-sans);
  background: var(--color-navy);
  color: var(--color-black);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-wrap: pretty;
}
/* Motif graphique discret dans les interstices sombres (constellation abstraite) */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image: radial-gradient(circle, rgba(168, 140, 88, 0.5) 1px, transparent 1.6px);
  background-size: 44px 44px;
  opacity: 0.3;
  pointer-events: none;
}
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  color: var(--color-black);
  line-height: 1.15;
  margin: 0 0 var(--space-sm);
  font-weight: 500;
}
h1 { font-size: clamp(2.4rem, 5vw, 4rem); }
.section-title { font-size: clamp(1.8rem, 3vw, 2.6rem); margin-bottom: var(--space-lg); }
h3 { font-size: 1.3rem; }
p { margin: 0 0 var(--space-sm); }
a { color: var(--color-brass); text-decoration: none; }
a:hover { color: var(--color-black); text-decoration: underline; text-underline-offset: 3px; }
img { max-width: 100%; display: block; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--color-brass); outline-offset: 3px; }

.container { max-width: var(--content-max); margin: 0 auto; padding: 0 var(--space-md); }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--color-black); color: var(--color-ivory);
  padding: var(--space-xs) var(--space-md); z-index: 999; border-radius: var(--radius-sm);
}
.skip-link:focus { left: var(--space-md); top: var(--space-xs); }

/* Chaque section est traitée comme un panneau clair posé sur le fond sombre */
.section {
  background: var(--color-paper);
  max-width: var(--content-max);
  margin: var(--space-lg) auto;
  padding: var(--space-2xl) var(--space-md);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
}
.section-eyebrow {
  font-family: var(--font-sans);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-brass);
  margin-bottom: var(--space-xs);
}

.reveal { transition: opacity 700ms ease, transform 700ms ease; }
@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(16px); }
  .reveal.is-visible { opacity: 1; transform: translateY(0); }
}
/* Filet de sécurité : si le JS de révélation ne s'exécute pas, les sections restent visibles */
.reveal.js-timeout { opacity: 1 !important; transform: none !important; }

/* ===== Transitions de page (repli automatique sans JS) ===== */
@media (prefers-reduced-motion: no-preference) {
  ::view-transition-old(root), ::view-transition-new(root) { animation-duration: 220ms; }
}
@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(root), ::view-transition-new(root) { animation: none; }
  .exp-main:hover, .exp-main:focus-within, .exp-main:active,
  .exp-side-item:hover, .exp-side-item:focus-within, .exp-side-item[open], .exp-side-item:active,
  .gov-card:hover, .gov-card:focus-within, .gov-card:active,
  .engagement-block:hover, .engagement-block:active, .engagement-block:focus-within,
  .engagement-block:hover .engagement-node, .engagement-block:active .engagement-node, .engagement-block:focus-within .engagement-node {
    transform: none;
  }
  .exp-side-summary::after, .xp-detail-summary::before { transition: none; }
}

/* ===== Barre de progression de lecture ===== */
#reading-progress {
  position: fixed; top: 0; left: 0; height: 2px; width: 0%;
  background: var(--color-brass); z-index: 150; pointer-events: none;
  transition: width 100ms linear;
}
@media (prefers-reduced-motion: reduce) { #reading-progress { transition: none; } }