/* ==========================================================================
   Base : reset, typographie, layout, accessibilité
   ========================================================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
}

[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: 5.5rem; /* ancres sous le header sticky */
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  min-height: 100dvh;
  background: var(--paper);
  color: var(--navy);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip; /* garde-fou : aucun scroll horizontal */
}

img,
picture,
svg,
video {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: 0;
  padding: 0;
}

a {
  color: inherit;
  text-underline-offset: 0.2em;
  text-decoration-thickness: 1px;
}

p,
li {
  text-wrap: pretty;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-title);
  color: var(--heading);
  text-wrap: balance;
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); line-height: var(--lh-snug); }
h4 { font-size: var(--fs-h4); line-height: var(--lh-snug); font-weight: 600; }

strong { font-weight: 700; }

/* ---- Sections : chaque section porte son contexte de couleur ---- */
.section {
  position: relative;
  isolation: isolate;
  padding-block: var(--section-y);
  background: var(--bg);
  color: var(--text);
}

.container {
  width: min(100% - 2 * var(--gutter), var(--container));
  margin-inline: auto;
}

.container--wide {
  width: min(100% - 2 * var(--gutter), 88rem);
  margin-inline: auto;
}

.container--narrow {
  width: min(100% - 2 * var(--gutter), var(--container-narrow));
  margin-inline: auto;
}

.stack > * + * {
  margin-top: var(--flow, var(--space-4));
}

.lead {
  font-size: var(--fs-lead);
  line-height: 1.55;
  color: var(--text-muted);
  max-width: var(--measure);
}

.muted { color: var(--text-muted); }

/* ---- Accessibilité ---- */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: var(--space-3);
  left: var(--space-3);
  z-index: var(--z-skip);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-pill);
  background: var(--navy);
  color: var(--white);
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-200%);
  transition: transform var(--dur) var(--ease-out);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

::selection {
  background: var(--teal);
  color: var(--navy);
}

/* ---- Icônes (sprite) ---- */
.icon {
  width: 1.25em;
  height: 1.25em;
  flex: none;
  fill: currentColor;
}

/* ---- Apparition au scroll : amélioration progressive ----
   Sans JS (ou mouvement réduit), le contenu est visible d'emblée. */
@media (prefers-reduced-motion: no-preference) {
  .js [data-reveal] {
    opacity: 0;
    transform: translateY(14px);
    transition:
      opacity var(--dur-slow) var(--ease-out),
      transform var(--dur-slow) var(--ease-out);
    transition-delay: calc(var(--reveal-i, 0) * 60ms);
  }

  .js [data-reveal].is-visible {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}