/* Daykem — vitrine. Palette : encre profonde + accent électrique, corps clair. */
:root {
  --encre: #0b1220;        /* fond sombre (hero, footer) */
  --encre-2: #111b30;
  --accent: #4f7dff;       /* bleu électrique */
  --accent-vif: #7c9cff;
  --papier: #f7f8fb;       /* fond clair */
  --carte: #ffffff;
  --texte: #1c2333;
  --texte-doux: #55607a;
  --texte-inverse: #eef1f8;
  --bord: #e3e7f0;
  --rayon: 14px;
  --largeur: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--texte);
  background: var(--papier);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ── Barre haute ─────────────────────────────────────────── */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 1.5rem;
  padding: .8rem clamp(1rem, 4vw, 2.5rem);
  background: rgba(11, 18, 32, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, .06);
}
.brand {
  font-size: 1.35rem; font-weight: 800; letter-spacing: -.02em;
  color: var(--texte-inverse); text-decoration: none;
}
.brand span { color: var(--accent-vif); }
.brand-inline { font-weight: 800; letter-spacing: -.02em; }
.topnav { display: flex; gap: 1.1rem; margin-left: auto; flex-wrap: wrap; }
.topnav a {
  color: #b9c2d8; text-decoration: none; font-size: .92rem;
}
.topnav a:hover { color: #fff; }

/* ── Boutons ─────────────────────────────────────────────── */
.btn {
  display: inline-block;
  background: var(--accent); color: #fff;
  padding: .8rem 1.5rem; border-radius: 999px;
  font-weight: 600; text-decoration: none;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
  box-shadow: 0 6px 20px rgba(79, 125, 255, .35);
}
.btn:hover { background: var(--accent-vif); transform: translateY(-1px); }
.btn-small { padding: .5rem 1.1rem; font-size: .88rem; box-shadow: none; }
.btn-big { font-size: 1.15rem; padding: 1rem 2.2rem; }
.btn-ghost {
  background: transparent; color: var(--texte-inverse);
  border: 1px solid rgba(255, 255, 255, .35); box-shadow: none;
}
.btn-ghost:hover { background: rgba(255, 255, 255, .08); }

/* ── Hero ────────────────────────────────────────────────── */
.hero {
  background:
    radial-gradient(1000px 500px at 80% -10%, rgba(79, 125, 255, .28), transparent 60%),
    radial-gradient(700px 400px at 10% 110%, rgba(79, 125, 255, .12), transparent 60%),
    var(--encre);
  color: var(--texte-inverse);
  padding: clamp(4rem, 10vw, 7rem) clamp(1rem, 4vw, 2.5rem) clamp(3rem, 6vw, 5rem);
  text-align: center;
}
.kicker {
  display: inline-block;
  font-size: .82rem; font-weight: 600; letter-spacing: .14em; text-transform: uppercase;
  color: var(--accent-vif);
  border: 1px solid rgba(124, 156, 255, .4);
  padding: .35rem 1rem; border-radius: 999px;
  margin: 0 0 1.5rem;
}
.hero h1 {
  font-size: clamp(2rem, 5.4vw, 3.6rem);
  line-height: 1.12; letter-spacing: -.025em;
  margin: 0 auto 1.2rem; max-width: 21ch;
}
.hero h1 em { font-style: normal; color: var(--accent-vif); }
.lead {
  max-width: 46rem; margin: 0 auto 2rem;
  font-size: clamp(1.02rem, 1.6vw, 1.18rem);
  color: #c4cde0;
}
.lead strong { color: #fff; }
.hero-actions { display: flex; gap: .9rem; justify-content: center; flex-wrap: wrap; }

/* Chiffres clés */
.stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 1px; background: rgba(255, 255, 255, .1);
  border: 1px solid rgba(255, 255, 255, .1); border-radius: var(--rayon);
  overflow: hidden;
  max-width: var(--largeur); margin: 3.2rem auto 0;
}
.stats > div { background: rgba(17, 27, 48, .85); padding: 1.3rem 1.1rem; }
.stats dt { font-size: 1.45rem; font-weight: 800; color: var(--accent-vif); letter-spacing: -.02em; }
.stats dd { margin: .3rem 0 0; font-size: .88rem; color: #aab4cc; }

/* ── Sections ────────────────────────────────────────────── */
.section {
  max-width: var(--largeur);
  margin: 0 auto;
  padding: clamp(3rem, 7vw, 5rem) clamp(1rem, 4vw, 2.5rem);
}
.section h2 {
  font-size: clamp(1.5rem, 3.2vw, 2.2rem);
  letter-spacing: -.02em; line-height: 1.2;
  margin: 0 0 1.8rem; max-width: 30ch;
}
.section-alt {
  max-width: none;
  background: #eef1f7;
}
.section-alt > * { max-width: var(--largeur); margin-left: auto; margin-right: auto; }
.section-alt h2 { margin-bottom: 1.8rem; }

.cols { display: grid; gap: 1.5rem; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.cols p { margin: 0; color: var(--texte-doux); }
.cols strong { color: var(--texte); }

/* ── Section focus (commandes par IA) — bandeau sombre plein écran ── */
.section-focus {
  background:
    radial-gradient(900px 450px at 15% -10%, rgba(79, 125, 255, .22), transparent 60%),
    var(--encre);
  color: var(--texte-inverse);
  padding: clamp(3rem, 7vw, 5rem) clamp(1rem, 4vw, 2.5rem);
}
.focus-inner { max-width: var(--largeur); margin: 0 auto; }
.section-focus h2 {
  font-size: clamp(1.5rem, 3.2vw, 2.2rem);
  letter-spacing: -.02em; line-height: 1.2;
  margin: 0 0 1.8rem; max-width: 34ch;
}
.section-focus h2 em { font-style: normal; color: var(--accent-vif); }
.cols-inverse p { color: #c4cde0; }
.cols-inverse strong { color: #fff; }
.section-focus .stats { margin-top: 2.4rem; }
.focus-sub {
  margin: 2.6rem 0 1rem;
  font-size: 1.15rem; letter-spacing: -.01em;
  color: #fff;
}
.focus-liste {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.focus-liste li {
  background: rgba(255, 255, 255, .05);
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: var(--rayon);
  padding: 1.1rem 1.3rem; font-size: .93rem; color: #c4cde0;
}
.focus-liste strong { display: block; color: #fff; margin-bottom: .2rem; }
.focus-cta { margin: 2.2rem 0 0; }

/* Cartes */
.cards { display: grid; gap: 1.1rem; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card {
  background: var(--carte); border: 1px solid var(--bord); border-radius: var(--rayon);
  padding: 1.5rem 1.4rem;
}
.card h3 { margin: 0 0 .5rem; font-size: 1.06rem; letter-spacing: -.01em; }
.card p { margin: 0; font-size: .93rem; color: var(--texte-doux); }

/* Étapes */
.steps {
  counter-reset: etape;
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 1.4rem;
}
.steps li {
  counter-increment: etape;
  position: relative;
  padding: 0 0 0 4.2rem;
}
.steps li::before {
  content: counter(etape);
  position: absolute; left: 0; top: .1rem;
  width: 2.9rem; height: 2.9rem;
  display: grid; place-items: center;
  background: var(--encre); color: var(--accent-vif);
  font-weight: 800; font-size: 1.15rem;
  border-radius: 12px;
}
.steps h3 { margin: 0 0 .35rem; font-size: 1.08rem; }
.steps p { margin: 0; color: var(--texte-doux); }

/* Cas d'usage */
.usecases {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}
.usecases li {
  background: var(--carte); border: 1px solid var(--bord); border-radius: var(--rayon);
  padding: 1.1rem 1.3rem; font-size: .95rem; color: var(--texte-doux);
}
.usecases strong { display: block; color: var(--texte); margin-bottom: .15rem; }

/* FAQ */
#faq details {
  border: 1px solid var(--bord); border-radius: var(--rayon);
  background: var(--carte);
  padding: 1rem 1.3rem; margin-bottom: .8rem;
}
#faq summary {
  cursor: pointer; font-weight: 600; letter-spacing: -.01em;
  list-style: none; position: relative; padding-right: 2rem;
}
#faq summary::after {
  content: "+"; position: absolute; right: .2rem; top: 50%;
  transform: translateY(-50%);
  color: var(--accent); font-size: 1.3rem; font-weight: 700;
}
#faq details[open] summary::after { content: "–"; }
#faq details p { margin: .8rem 0 0; color: var(--texte-doux); }

/* CTA final */
.cta-final { text-align: center; }
.cta-final h2 { margin-left: auto; margin-right: auto; }
.cta-final p { max-width: 38rem; margin: 0 auto 1.8rem; color: var(--texte-doux); }

/* ── Pied de page ────────────────────────────────────────── */
.footer {
  background: var(--encre); color: #8d99b5;
  text-align: center; font-size: .88rem;
  padding: 2.2rem 1rem;
}
.footer p { margin: .25rem 0; }
.footer a { color: #b9c2d8; }

/* Révélation au défilement (progressive enhancement, cf. app.js) */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .5s ease, transform .5s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ── Mobile ──────────────────────────────────────────────── */
@media (max-width: 720px) {
  .topnav { display: none; }
  .topbar { justify-content: space-between; }
  .steps li { padding-left: 3.6rem; }
  .steps li::before { width: 2.5rem; height: 2.5rem; }
}