/* ============================================================
   belosoAAA — Agence d'Agents Artificielle
   Design épuré : blanc, typographie système, aucun superflu
   ============================================================ */

:root {
  --blanc: #ffffff;
  --gris-fond: #f5f5f7;
  --noir: #1d1d1f;
  --gris: #6e6e73;
  --gris-ligne: #d2d2d7;
  --accent: #9a7b3f;
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", "Inter", "Helvetica Neue", Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--blanc);
  color: var(--noir);
  font-family: var(--sans);
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: var(--noir); color: var(--blanc); }

img, svg { display: block; }

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

.container {
  width: min(1024px, 92%);
  margin: 0 auto;
}

/* ---------- Typographie ---------- */

h1, h2, h3 {
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.018em;
}

h1 { font-size: clamp(2.5rem, 6vw, 4.2rem); }
h2 { font-size: clamp(1.9rem, 4vw, 3rem); }
h3 { font-size: 1.35rem; letter-spacing: -0.01em; }

.label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--accent);
  margin-bottom: 1rem;
}

.lead {
  font-size: 1.2rem;
  line-height: 1.55;
  color: var(--gris);
  max-width: 42rem;
}

/* ---------- Navigation ---------- */

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}

.nav.scrolled { border-bottom-color: var(--gris-ligne); }

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.brand svg { height: 22px; width: auto; }

.brand__name {
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 2.2rem;
  list-style: none;
}

.nav__links a {
  font-size: 0.85rem;
  color: var(--gris);
  transition: color 0.25s;
}

.nav__links a:hover,
.nav__links a.active { color: var(--noir); }

.burger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 26px;
  height: 18px;
  position: relative;
  z-index: 110;
}

.burger span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  border-radius: 2px;
  background: var(--noir);
  transition: transform 0.3s ease, opacity 0.3s ease, top 0.3s ease;
}

.burger span:nth-child(1) { top: 0; }
.burger span:nth-child(2) { top: 8px; }
.burger span:nth-child(3) { top: 16px; }

.burger.open span:nth-child(1) { top: 8px; transform: rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { top: 8px; transform: rotate(-45deg); }

/* ---------- Boutons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.75rem 1.6rem;
  border-radius: 980px;
  border: none;
  background: var(--noir);
  color: var(--blanc);
  cursor: pointer;
  transition: opacity 0.25s, transform 0.25s;
}

.btn:hover { opacity: 0.85; transform: translateY(-1px); }

.lien {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--accent);
  transition: gap 0.25s;
}

.lien:hover { gap: 0.65rem; }

/* ---------- Hero ---------- */

.hero {
  padding: 11rem 0 7rem;
  text-align: center;
}

.hero--sous-page { padding: 10rem 0 5rem; }

.hero__contenu {
  max-width: 50rem;
  margin: 0 auto;
}

.hero h1 { margin-bottom: 1.5rem; }

.hero .lead { margin: 0 auto 2.5rem; }

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
  align-items: center;
}

/* ---------- Bandeau de repères ---------- */

.reperes {
  background: var(--gris-fond);
  border-radius: 24px;
  width: min(1024px, 92%);
  margin: 0 auto;
}

.reperes__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 3rem 1rem;
}

.repere { text-align: center; padding: 0.5rem 1rem; }

.repere__valeur {
  font-size: 1.7rem;
  font-weight: 600;
  letter-spacing: -0.015em;
}

.repere__label {
  font-size: 0.85rem;
  color: var(--gris);
  margin-top: 0.2rem;
}

/* ---------- Sections ---------- */

.section { padding: 7rem 0; }

.section--gris .container-large,
.section--gris { background: var(--blanc); }

.section__entete {
  max-width: 42rem;
  margin-bottom: 3.5rem;
}

.section__entete--center {
  margin-inline: auto;
  text-align: center;
}

.section__entete h2 { margin-bottom: 1rem; }

/* ---------- Cartes ---------- */

.cartes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}

.carte {
  background: var(--gris-fond);
  border-radius: 20px;
  padding: 2.2rem 2rem;
  transition: transform 0.3s ease;
}

.carte:hover { transform: translateY(-3px); }

.carte h3 { margin-bottom: 0.7rem; }

.carte p { color: var(--gris); font-size: 0.95rem; }

/* ---------- Offres signature ---------- */

.offre {
  background: var(--gris-fond);
  border-radius: 24px;
  padding: 3.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: start;
}

.offre + .offre { margin-top: 1.5rem; }

.offre h3 {
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  margin-bottom: 0.6rem;
}

.offre__pour {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 1.3rem;
}

.offre__desc { color: var(--gris); margin-bottom: 1.3rem; }

.offre__liste {
  list-style: none;
  display: grid;
  gap: 0;
}

.offre__liste li {
  padding: 0.85rem 0;
  color: var(--gris);
  font-size: 0.95rem;
  border-bottom: 1px solid var(--gris-ligne);
}

.offre__liste li:first-child { padding-top: 0; }
.offre__liste li:last-child { border-bottom: none; padding-bottom: 0; }

.offre__liste strong {
  color: var(--noir);
  font-weight: 500;
}

/* ---------- Méthode / étapes ---------- */

.etapes { display: grid; gap: 0; }

.etape {
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: 2rem;
  padding: 2.6rem 0;
  border-top: 1px solid var(--gris-ligne);
  align-items: start;
}

.etape:last-child { border-bottom: 1px solid var(--gris-ligne); }

.etape__num {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--gris);
  padding-top: 0.35rem;
}

.etape h3 { margin-bottom: 0.6rem; }

.etape p { color: var(--gris); max-width: 38rem; }

/* ---------- Principes (deux colonnes) ---------- */

.principes {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
}

/* ---------- Manifeste ---------- */

.manifeste {
  text-align: center;
  max-width: 46rem;
  margin: 0 auto;
}

.manifeste blockquote {
  font-size: clamp(1.5rem, 3vw, 2.3rem);
  font-weight: 600;
  letter-spacing: -0.018em;
  line-height: 1.25;
}

.manifeste blockquote .accent { color: var(--accent); }

.manifeste figcaption {
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--gris);
}

/* ---------- CTA final ---------- */

.cta-final {
  text-align: center;
  padding: 7rem 0;
}

.cta-final h2 { margin-bottom: 1.2rem; }

.cta-final .lead { margin: 0 auto 2.5rem; }

/* ---------- Contact ---------- */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 4rem;
  align-items: start;
}

.coordonnee { padding: 1.4rem 0; border-bottom: 1px solid var(--gris-ligne); }

.coordonnee:first-child { padding-top: 0; }
.coordonnee:last-child { border-bottom: none; }

.coordonnee__label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--gris);
  margin-bottom: 0.25rem;
}

.coordonnee a, .coordonnee p {
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--noir);
  transition: color 0.25s;
}

.coordonnee a:hover { color: var(--accent); }

.coordonnee small {
  display: block;
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--gris);
  margin-top: 0.2rem;
}

/* ---------- Formulaire ---------- */

.form {
  display: grid;
  gap: 1.1rem;
  background: var(--gris-fond);
  border-radius: 24px;
  padding: 2.5rem;
}

.form__ligne { display: grid; gap: 0.35rem; }

.form__deux {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.1rem;
}

label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--gris);
}

input, select, textarea {
  background: var(--blanc);
  border: 1px solid var(--gris-ligne);
  border-radius: 12px;
  color: var(--noir);
  font-family: var(--sans);
  font-size: 0.95rem;
  padding: 0.7rem 0.9rem;
  outline: none;
  transition: border-color 0.25s, box-shadow 0.25s;
}

select { appearance: none; cursor: pointer; }

input:focus, select:focus, textarea:focus {
  border-color: var(--noir);
  box-shadow: 0 0 0 3px rgba(29, 29, 31, 0.08);
}

textarea { resize: vertical; min-height: 110px; }

/* ---------- Footer ---------- */

.footer {
  background: var(--gris-fond);
  padding: 3.5rem 0 2rem;
  margin-top: 2rem;
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer__bio {
  color: var(--gris);
  font-size: 0.85rem;
  max-width: 20rem;
  margin-top: 0.9rem;
}

.footer h4 {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--noir);
  margin-bottom: 0.9rem;
}

.footer ul { list-style: none; display: grid; gap: 0.5rem; }

.footer ul a {
  color: var(--gris);
  font-size: 0.85rem;
  transition: color 0.25s;
}

.footer ul a:hover { color: var(--noir); }

.footer__bas {
  border-top: 1px solid var(--gris-ligne);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.8rem;
  font-size: 0.8rem;
  color: var(--gris);
}

/* ---------- Animations d'apparition ---------- */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

.reveal-d1 { transition-delay: 0.1s; }
.reveal-d2 { transition-delay: 0.2s; }
.reveal-d3 { transition-delay: 0.3s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */

@media (max-width: 920px) {
  .cartes, .principes { grid-template-columns: 1fr; }
  .offre { grid-template-columns: 1fr; gap: 2rem; padding: 2.2rem; }
  .contact-grid { grid-template-columns: 1fr; gap: 3rem; }
  .reperes__grid { grid-template-columns: repeat(2, 1fr); gap: 1.5rem 0; }
  .footer__grid { grid-template-columns: 1fr; gap: 2rem; }
  .etape { grid-template-columns: 1fr; gap: 0.4rem; }
  .etape__num { padding-top: 0; }

  .nav__links {
    position: fixed;
    inset: 0;
    flex-direction: column;
    justify-content: center;
    gap: 1.8rem;
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transform: translateX(100%);
    transition: transform 0.4s ease;
  }

  .nav__links.open { transform: translateX(0); }

  .nav__links a { font-size: 1.15rem; color: var(--noir); }

  .burger { display: block; }
}

@media (max-width: 560px) {
  .section { padding: 4.5rem 0; }
  .hero { padding: 8.5rem 0 4.5rem; }
  .form { padding: 1.8rem 1.4rem; }
  .form__deux { grid-template-columns: 1fr; }
  .reperes__grid { grid-template-columns: 1fr; gap: 1.8rem; }
}