/* ============================================================
   Expert IA Suisse — Design system « grand cabinet »
   Palette : marine institutionnel + bleu royal + blanc
   Typographie : Newsreader (titres) / Inter (texte)
   ============================================================ */

:root {
  --navy: #0a1e3c;
  --navy-2: #102a4f;
  --royal: #2563eb;
  --royal-deep: #1d4fc4;
  --paper: #ffffff;
  --mist: #f4f6fa;
  --ink: #16243a;
  --slate: #55677f;
  --rule: #dde4ee;
  --rule-navy: #24416e;
  --on-navy: #b9c7de;
  --on-navy-strong: #eef3fa;
  --font-display: "Newsreader", Georgia, "Times New Roman", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --container: 1140px;
  --radius: 2px;
}

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

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ---------- Typographie ---------- */
h1, h2, h3, .display {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--ink);
}
h1 { font-size: clamp(2.4rem, 5vw, 3.9rem); }
h2 { font-size: clamp(1.8rem, 3.2vw, 2.5rem); }
h3 { font-size: 1.35rem; line-height: 1.3; }

.eyebrow {
  display: block;
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--royal);
  margin-bottom: 1.1rem;
}
.eyebrow::after {
  content: "";
  display: block;
  width: 36px;
  height: 1px;
  background: var(--royal);
  margin-top: 0.9rem;
}
.eyebrow--center { text-align: center; }
.eyebrow--center::after { margin-left: auto; margin-right: auto; }
.on-navy .eyebrow { color: #7ea2e8; }
.on-navy .eyebrow::after { background: #7ea2e8; }

.lead { font-size: 1.125rem; color: var(--slate); max-width: 56ch; }

a { color: var(--royal-deep); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--royal);
  outline-offset: 3px;
}

/* ---------- Boutons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  padding: 0.95rem 1.9rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
  text-decoration: none !important;
}
.btn--primary { background: var(--royal); color: #fff; }
.btn--primary:hover { background: var(--royal-deep); }
.btn--ghost { background: transparent; color: var(--on-navy-strong); border-color: var(--rule-navy); }
.btn--ghost:hover { border-color: var(--on-navy); }
.btn--outline { background: transparent; color: var(--royal-deep); border-color: var(--royal); }
.btn--outline:hover { background: var(--royal); color: #fff; }

/* ---------- En-tête ---------- */
.topline { height: 3px; background: linear-gradient(90deg, var(--royal), var(--navy)); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.wordmark {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--navy);
  text-decoration: none !important;
  letter-spacing: 0.01em;
}
.wordmark em { font-style: normal; color: var(--royal); }
.wordmark small {
  display: block;
  font-family: var(--font-body);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--slate);
  margin-top: -2px;
}

.site-nav { display: flex; align-items: center; gap: 2rem; }
.site-nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink);
  text-decoration: none !important;
  padding: 0.4rem 0;
  border-bottom: 1px solid transparent;
}
.site-nav a:hover, .site-nav a[aria-current="page"] { border-bottom-color: var(--royal); color: var(--royal-deep); }
.site-nav .btn { padding: 0.65rem 1.3rem; font-size: 0.8125rem; }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 0.5rem 0.7rem;
  font-size: 1.1rem;
  color: var(--navy);
  cursor: pointer;
}

@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .site-nav {
    display: none;
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--rule);
    padding: 0.5rem 24px 1.25rem;
  }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 0.85rem 0; border-bottom: 1px solid var(--rule); }
  .site-nav .btn { margin-top: 1rem; justify-content: center; }
}

/* ---------- Héro ---------- */
.hero {
  background: var(--navy);
  color: var(--on-navy);
  padding: clamp(4.5rem, 9vw, 7.5rem) 0 clamp(4rem, 8vw, 6.5rem);
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: -120px;
  width: 560px;
  height: 100%;
  background:
    linear-gradient(var(--rule-navy) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule-navy) 1px, transparent 1px);
  background-size: 56px 56px;
  opacity: 0.28;
  mask-image: linear-gradient(105deg, transparent 18%, #000 75%);
  -webkit-mask-image: linear-gradient(105deg, transparent 18%, #000 75%);
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; }
.hero h1 { color: #fff; max-width: 17ch; }
.hero h1 em { font-style: italic; color: #9db9ef; }
.hero .lead { color: var(--on-navy); margin-top: 1.6rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2.6rem; }
.hero-note { font-size: 0.8125rem; color: var(--on-navy); margin-top: 1.4rem; opacity: 0.85; }

/* ---------- Bandeau chiffres clés (signature) ---------- */
.factband { background: var(--navy-2); color: var(--on-navy); border-top: 1px solid var(--rule-navy); }
.factband .container { padding-top: 3rem; padding-bottom: 2.4rem; }
.factband-title {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #7ea2e8;
  margin-bottom: 2rem;
}
.factgrid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2.5rem;
}
.fact { border-top: 1px solid var(--rule-navy); padding-top: 1.2rem; }
.fact-num {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.4vw, 2.9rem);
  font-weight: 500;
  color: #fff;
  line-height: 1;
}
.fact-num sup { font-size: 0.45em; color: #9db9ef; }
.fact-label { font-size: 0.875rem; color: var(--on-navy-strong); margin-top: 0.55rem; font-weight: 500; }
.fact-src { font-size: 0.75rem; color: var(--on-navy); margin-top: 0.35rem; opacity: 0.8; }
.fact-src a { color: #9db9ef; }
@media (max-width: 920px) { .factgrid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .factgrid { grid-template-columns: 1fr; } }

/* ---------- Sections ---------- */
.section { padding: clamp(4rem, 8vw, 6.5rem) 0; }
.section--mist { background: var(--mist); }
.section--navy { background: var(--navy); color: var(--on-navy); }
.section--navy h2, .section--navy h3 { color: #fff; }
.section-head { max-width: 720px; margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.section-head--center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head .lead { margin-top: 1.1rem; }
.section-head--center .lead { margin-left: auto; margin-right: auto; }

/* ---------- Domaines d'expertise (I / II / III) ---------- */
.practices { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2.5rem; }
@media (max-width: 860px) { .practices { grid-template-columns: 1fr; } }
.practice { border-top: 2px solid var(--navy); padding-top: 1.6rem; }
.practice-numeral {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--royal);
}
.practice h3 { margin-top: 0.7rem; }
.practice p { color: var(--slate); margin-top: 0.85rem; font-size: 0.9375rem; }
.practice-link { display: inline-block; margin-top: 1.1rem; font-size: 0.875rem; font-weight: 600; }

/* ---------- Deux colonnes éditoriales ---------- */
.twocol { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2.5rem, 6vw, 5rem); align-items: start; }
@media (max-width: 860px) { .twocol { grid-template-columns: 1fr; } }
.checklist { list-style: none; margin-top: 1.6rem; }
.checklist li { padding: 0.85rem 0 0.85rem 1.9rem; position: relative; border-bottom: 1px solid var(--rule); font-size: 0.9375rem; color: var(--slate); }
.checklist li:last-child { border-bottom: none; }
.checklist li::before { content: "—"; position: absolute; left: 0; color: var(--royal); font-weight: 600; }
.checklist strong { color: var(--ink); }
.on-navy .checklist li, .section--navy .checklist li { border-bottom-color: var(--rule-navy); color: var(--on-navy); }
.section--navy .checklist strong { color: #fff; }

.panel {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-top: 2px solid var(--royal);
  padding: clamp(1.8rem, 4vw, 2.8rem);
}
.section--navy .panel { background: var(--navy-2); border-color: var(--rule-navy); border-top-color: var(--royal); }

/* ---------- Cartes scénarios ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.75rem; }
@media (max-width: 860px) { .cards { grid-template-columns: 1fr; } }
.card {
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 2rem;
  display: flex;
  flex-direction: column;
}
.card-kicker { font-size: 0.6875rem; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase; color: var(--royal); }
.card h3 { font-size: 1.2rem; margin-top: 0.8rem; }
.card p { font-size: 0.9rem; color: var(--slate); margin-top: 0.8rem; }
.card .card-outcome { margin-top: auto; padding-top: 1.2rem; font-size: 0.9rem; color: var(--ink); font-weight: 500; border-top: 1px solid var(--rule); margin-top: 1.4rem; }
a.card-outcome:hover { text-decoration: underline; }
.disclaimer-line { font-size: 0.78125rem; color: var(--slate); margin-top: 2rem; text-align: center; font-style: italic; }

/* ---------- Tarif ---------- */
.pricing-card {
  max-width: 520px;
  margin: 0 auto;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--navy);
  padding: clamp(2rem, 5vw, 3rem);
  text-align: center;
}
.pricing-card .price {
  font-family: var(--font-display);
  font-size: clamp(3rem, 6vw, 4rem);
  font-weight: 500;
  color: var(--navy);
  line-height: 1;
  margin: 1.4rem 0 0.3rem;
}
.pricing-card .price small { font-size: 0.32em; font-family: var(--font-body); font-weight: 600; letter-spacing: 0.1em; color: var(--slate); }
.price-terms { font-size: 0.8125rem; color: var(--slate); }
.pricing-list { list-style: none; text-align: left; margin: 1.8rem 0; }
.pricing-list li { padding: 0.7rem 0 0.7rem 1.8rem; position: relative; border-bottom: 1px solid var(--rule); font-size: 0.9375rem; }
.pricing-list li:last-child { border-bottom: none; }
.pricing-list li::before { content: "✓"; position: absolute; left: 0; color: var(--royal); font-weight: 700; }
.pricing-guarantee { margin-top: 1.4rem; padding-top: 1.4rem; border-top: 1px solid var(--rule); font-size: 0.875rem; font-weight: 600; color: var(--navy); }
.stripe-wrap { margin-top: 1.6rem; min-height: 56px; }

/* ---------- FAQ ---------- */
.faq { max-width: 780px; margin: 0 auto; }
.faq details { border-bottom: 1px solid var(--rule); }
.faq summary {
  list-style: none;
  cursor: pointer;
  padding: 1.4rem 2.5rem 1.4rem 0;
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--ink);
  position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 0.3rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--royal);
  transition: transform 0.2s ease;
}
.faq details[open] summary::after { content: "–"; }
.faq details p { padding: 0 0 1.5rem; color: var(--slate); font-size: 0.9375rem; max-width: 65ch; }

/* ---------- CTA final ---------- */
.cta-final { text-align: center; }
.cta-final h2 { color: #fff; max-width: 22ch; margin: 0 auto; }
.cta-final .lead { color: var(--on-navy); margin: 1.2rem auto 0; }
.cta-final .btn { margin-top: 2.2rem; }

/* ---------- Pied de page ---------- */
.site-footer { background: var(--navy); color: var(--on-navy); padding: 4rem 0 2.5rem; font-size: 0.875rem; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2.5rem; }
@media (max-width: 860px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .footer-grid { grid-template-columns: 1fr; } }
.site-footer .wordmark { color: #fff; }
.site-footer .wordmark small { color: var(--on-navy); }
.footer-tagline { margin-top: 0.9rem; max-width: 30ch; }
.site-footer h4 {
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #7ea2e8;
  margin-bottom: 1.1rem;
}
.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: 0.6rem; }
.site-footer a { color: var(--on-navy); }
.site-footer a:hover { color: #fff; }
.footer-bottom {
  margin-top: 3rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--rule-navy);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  font-size: 0.78125rem;
  opacity: 0.85;
}

/* ---------- Pages intérieures ---------- */
.page-hero { background: var(--navy); color: var(--on-navy); padding: clamp(3.5rem, 7vw, 5.5rem) 0; }
.page-hero h1 { color: #fff; max-width: 20ch; }
.page-hero .lead { color: var(--on-navy); margin-top: 1.2rem; }

.article-list { display: grid; gap: 1.75rem; grid-template-columns: repeat(2, 1fr); }
@media (max-width: 760px) { .article-list { grid-template-columns: 1fr; } }
.article-item { background: var(--paper); border: 1px solid var(--rule); padding: 2rem; display: flex; flex-direction: column; }
.article-item h3 { font-size: 1.25rem; margin-top: 0.8rem; }
.article-item h3 a { color: var(--ink); }
.article-item p { font-size: 0.9rem; color: var(--slate); margin-top: 0.8rem; }
.article-meta { font-size: 0.78125rem; color: var(--slate); margin-top: 1.2rem; }
.article-item .article-cta { margin-top: auto; padding-top: 1.2rem; font-size: 0.875rem; font-weight: 600; }

/* Corps d'article / page légale */
.prose { max-width: 760px; margin: 0 auto; }
.prose > * + * { margin-top: 1.1rem; }
.prose h2 { font-size: 1.75rem; margin-top: 2.8rem; }
.prose h3 { font-size: 1.25rem; margin-top: 2rem; }
.prose p, .prose li { color: var(--slate); font-size: 1rem; }
.prose strong { color: var(--ink); }
.prose ul, .prose ol { padding-left: 1.4rem; }
.prose li { margin-top: 0.5rem; }
.prose blockquote { border-left: 2px solid var(--royal); padding: 0.4rem 0 0.4rem 1.4rem; font-style: italic; }
.prose .backlink { display: inline-block; margin-bottom: 1rem; font-size: 0.875rem; font-weight: 600; }
.prose-note {
  background: var(--mist);
  border-left: 2px solid var(--royal);
  padding: 1.2rem 1.5rem;
  font-size: 0.875rem;
  color: var(--slate);
}

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: clamp(2.5rem, 6vw, 5rem); }
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-block { border-top: 2px solid var(--navy); padding-top: 1.4rem; margin-bottom: 2rem; }
.contact-block h3 { font-size: 1.15rem; }
.contact-block p { color: var(--slate); font-size: 0.9375rem; margin-top: 0.5rem; }
.contact-email { font-family: var(--font-display); font-size: 1.3rem; margin-top: 0.6rem; display: inline-block; }

.form-field { margin-bottom: 1.4rem; }
.form-field label { display: block; font-size: 0.8125rem; font-weight: 600; letter-spacing: 0.04em; margin-bottom: 0.45rem; color: var(--ink); }
.form-field input, .form-field textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--ink);
  background: var(--paper);
}
.form-field input:focus, .form-field textarea:focus { outline: 2px solid var(--royal); outline-offset: 0; border-color: var(--royal); }
.form-note { font-size: 0.78125rem; color: var(--slate); margin-top: 1rem; }

/* ---------- Révélation au défilement (uniquement si JS actif) ---------- */
.has-js .reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.has-js .reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .has-js .reveal { opacity: 1; transform: none; } }

/* ---------- 404 ---------- */
.error-page { text-align: center; padding: clamp(5rem, 12vw, 9rem) 0; }
.error-code { font-family: var(--font-display); font-size: clamp(5rem, 14vw, 9rem); color: var(--rule); line-height: 1; }