/* ==========================================================================
   IBVB — Base / reset / typographie
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

html {
  overflow-x: hidden;
  width: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--color-ink);
  background: var(--color-ivory);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  width: 100%;
  position: relative;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.12;
  margin: 0;
  color: var(--color-night);
  letter-spacing: -0.01em;
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

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

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

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

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* Focus visible — accessibilité clavier */
:focus-visible {
  outline: 3px solid var(--color-cyan);
  outline-offset: 3px;
  border-radius: 4px;
}
a:focus-visible, button:focus-visible {
  outline-offset: 4px;
}

/* Skip to content */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -100px;
  background: var(--color-night);
  color: var(--color-white);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-sm);
  z-index: 1000;
  font-size: var(--fs-small);
  font-weight: 600;
  transition: top 0.2s var(--ease);
}
.skip-link:focus {
  top: 1rem;
}

/* Container */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.container-narrow {
  max-width: 780px;
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

/* Sections */
.section {
  padding-block: var(--space-xl);
}
.section--tight { padding-block: var(--space-lg); }
.section--night {
  background: var(--color-night);
  color: rgba(250,249,246,0.88);
}
.section--night h1, .section--night h2, .section--night h3 {
  color: var(--color-white);
}
.section--alt { background: var(--color-ivory-2); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: var(--fs-micro);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-indigo);
  margin-bottom: 0.85rem;
}
.section--night .eyebrow { color: var(--color-cyan); }

.eyebrow::before {
  content: '';
  width: 24px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
}

.lead {
  font-size: var(--fs-lead);
  color: var(--color-ink-soft);
  max-width: 640px;
}
.section--night .lead { color: rgba(250,249,246,0.75); }

/* Boutons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.9rem 1.6rem;
  border-radius: 999px;
  font-size: var(--fs-small);
  font-weight: 600;
  white-space: nowrap;
  transition: transform 0.3s var(--ease), background-color 0.25s var(--ease), color 0.25s var(--ease), box-shadow 0.25s var(--ease), border-color 0.25s var(--ease);
  min-height: 48px;
}
.btn-primary {
  background: var(--color-indigo);
  color: var(--color-white);
  box-shadow: 0 8px 20px rgba(55,48,169,0.28);
}
.btn-primary:hover {
  background: var(--color-indigo-dark);
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(55,48,169,0.32);
}
.btn-secondary {
  background: transparent;
  color: var(--color-night);
  border: 1.5px solid var(--color-line);
}
.btn-secondary:hover {
  border-color: var(--color-indigo);
  color: var(--color-indigo);
  transform: translateY(-2px);
}
.section--night .btn-secondary {
  color: var(--color-white);
  border-color: rgba(250,249,246,0.28);
}
.section--night .btn-secondary:hover {
  border-color: var(--color-cyan);
  color: var(--color-cyan);
}
.btn-ghost {
  color: var(--color-indigo);
  padding: 0.5rem 0;
  font-weight: 600;
  gap: 0.4rem;
}
.btn-ghost .arrow { transition: transform 0.25s var(--ease); }
.btn-ghost:hover .arrow { transform: translateX(4px); }
.section--night .btn-ghost { color: var(--color-cyan); }

.btn-block { width: 100%; }

/* Visually hidden (accessible mais invisible) */
.visually-hidden {
  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 */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* Placeholder tag — pour tout contenu à confirmer */
.tag-placeholder {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: var(--fs-micro);
  font-weight: 600;
  color: var(--color-indigo);
  background: var(--color-cyan-soft);
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  letter-spacing: 0.01em;
}

.text-center { text-align: center; }