/* =========================================================
   BASE — reset, éléments HTML, accessibilité
   ========================================================= */

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

html {
  scroll-behavior: smooth;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--surface-page);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

a { color: inherit; text-decoration: none; }

ul, ol { margin: 0; padding: 0; list-style: none; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  margin: 0;
  line-height: var(--lh-heading);
  color: var(--text-primary);
}

h1 {
  font-size: var(--fs-h1);
  line-height: var(--lh-tight);
  letter-spacing: 0.005em;
  font-weight: 800;
  text-transform: uppercase;
}
h2 { font-size: var(--fs-h2); letter-spacing: 0.002em; }
h3 { font-size: var(--fs-h3); }

p { margin: 0; }

/* --- Focus visible : accessibilité clavier --- */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--c-ocean);
  outline-offset: 3px;
  border-radius: 4px;
}

/* --- Lien d'évitement --- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -60px;
  background: var(--c-deep);
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  z-index: 999;
  transition: top var(--dur-fast) var(--ease-soft);
}
.skip-link:focus { top: 1rem; }

/* --- Utilitaires layout --- */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: var(--space-section);
  position: relative;
}
.section--sm { padding-block: var(--space-section-sm); }
.section--alt { background: var(--surface-alt); }
.section--deep { background: var(--surface-deep); color: var(--text-on-deep); }
.section--deep h1, .section--deep h2, .section--deep h3 { color: #fff; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-ocean);
  background: var(--surface-alt);
  border: 1px solid var(--border-fine);
  padding: 0.45rem 1.05rem;
  border-radius: var(--radius-pill);
}
.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gradient-aero);
  display: inline-block;
  flex-shrink: 0;
}
.section--deep .eyebrow,
.orly .eyebrow {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.lead {
  font-size: var(--fs-lead);
  color: var(--text-secondary);
  line-height: var(--lh-body);
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* --- Reveal on scroll (voir reveal.js) --- */
[data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity var(--dur-slow) var(--ease-soft), transform var(--dur-slow) var(--ease-soft);
  will-change: opacity, transform;
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* --- Stagger enfants d'un groupe reveal --- */
[data-reveal-group] > * {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--dur-base) var(--ease-soft), transform var(--dur-base) var(--ease-soft);
}
[data-reveal-group].is-visible > * { opacity: 1; transform: translateY(0); }
[data-reveal-group].is-visible > *:nth-child(1) { transition-delay: 0.02s; }
[data-reveal-group].is-visible > *:nth-child(2) { transition-delay: 0.08s; }
[data-reveal-group].is-visible > *:nth-child(3) { transition-delay: 0.14s; }
[data-reveal-group].is-visible > *:nth-child(4) { transition-delay: 0.2s; }
[data-reveal-group].is-visible > *:nth-child(5) { transition-delay: 0.26s; }
[data-reveal-group].is-visible > *:nth-child(6) { transition-delay: 0.32s; }
[data-reveal-group].is-visible > *:nth-child(7) { transition-delay: 0.38s; }
@media (prefers-reduced-motion: reduce) {
  [data-reveal-group] > * { opacity: 1 !important; transform: none !important; transition: none !important; }
}