:root {
  /* Charte AlfaIA « Établi » : bleu de travail, jaune chantier, anthracite, acier, zinc */
  --bg: #f7f8fa;
  --bg-alt: #eef1f4;
  --surface: #ffffff;
  --ink: #1d2228;
  --ink-soft: #4f5864;
  --line: #dde2e8;
  --primary: #24457a;
  --primary-dark: #1b3561;
  --primary-ink: #ffffff;
  --primary-soft: #e3e9f2;
  --accent: #f5c518;
  --accent-dark: #e0b30c;
  --accent-ink: #1d2228;
  --steel: #8a97a8;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 2px rgba(29, 34, 40, .05), 0 8px 24px rgba(29, 34, 40, .07);
  --font-display: "Archivo", "Arial Black", Arial, sans-serif;
  --font-body: "Archivo", "Helvetica Neue", Arial, sans-serif;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: var(--font-display); line-height: 1.12; margin: 0 0 .5em; letter-spacing: -.01em; text-wrap: balance; }
/* Titres en Archivo élargi (Expanded), sous-titres en largeur normale */
h1, h2, .display { font-stretch: 125%; font-weight: 800; }
h1 { font-size: clamp(2.1rem, 4.6vw, 3.3rem); }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.3rem); }
h3 { font-size: 1.15rem; font-weight: 700; }
@media (max-width: 760px) { h1, h2 { hyphens: auto; overflow-wrap: break-word; } .logo small { display: none; } }
p { margin: 0 0 1em; }
a { color: inherit; }

.container { width: min(1140px, 100% - 32px); margin-inline: auto; }
.container.narrow { width: min(780px, 100% - 32px); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: .85em 1.4em;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  font: 600 1rem/1.2 var(--font-body);
  text-decoration: none;
  cursor: pointer;
  transition: transform .15s ease, background-color .15s ease, border-color .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--primary); color: var(--primary-ink); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-accent { background: var(--accent); color: var(--accent-ink); }
.btn-accent:hover { background: var(--accent-dark); }
.btn-ghost { border-color: var(--ink); color: var(--ink); background: transparent; }
.btn-ghost:hover { background: var(--ink); color: var(--bg); }
.btn-sm { padding: .6em 1.1em; font-size: .92rem; }
.btn-block { width: 100%; }

.eyebrow {
  font-size: .82rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase;
  color: var(--primary); margin-bottom: .8em;
}
.eyebrow.light { color: var(--accent); }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(247, 248, 250, .9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s;
}
.site-header.scrolled { border-color: var(--line); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }

.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; line-height: 1.2; }
.logo-row { display: flex; align-items: center; gap: 8px; }
.logo-img { display: block; height: 38px; width: auto; }
.logo small { font-weight: 500; font-size: .72rem; color: var(--ink-soft); max-width: 6em; }

/* Icônes au trait, 2 px, couleur héritée */
.ico { width: 1em; height: 1em; display: block; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

.nav { display: flex; align-items: center; gap: 1.6rem; }
.nav a:not(.btn) { text-decoration: none; font-weight: 500; font-size: .95rem; color: var(--ink-soft); }
.nav a:not(.btn):hover { color: var(--ink); }

.nav-toggle { display: none; background: none; border: 0; padding: 8px; cursor: pointer; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--ink); margin: 5px 0; transition: transform .2s, opacity .2s; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Hero */
.hero { padding: 72px 0 96px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items: center; }
.hl { color: var(--primary); position: relative; white-space: nowrap; isolation: isolate; }
.hl::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: .06em; height: .28em;
  background: var(--accent); opacity: .9; z-index: -1; border-radius: 999px;
}
.lead { font-size: 1.15rem; color: var(--ink-soft); max-width: 34em; }
.lead strong { color: var(--ink); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0; }
.trust { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px 22px; font-size: .92rem; color: var(--ink-soft); }
.trust li::before { content: "✓"; color: var(--primary); font-weight: 700; margin-right: 6px; }

.hero-visual { position: relative; padding: 0 0 100px 0; }
.mock-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow); transform: rotate(-1.5deg);
}
.mock-head { display: flex; justify-content: space-between; align-items: center; font-size: .88rem; color: var(--ink-soft); font-weight: 500; }
.pill { background: var(--primary-soft); color: var(--primary); padding: 4px 10px; border-radius: 999px; font-size: .78rem; font-weight: 600; }
.mock-big { font-family: var(--font-display); font-stretch: 125%; font-size: 3rem; font-weight: 800; margin: 12px 0 18px; line-height: 1; color: var(--primary); }
.mock-big small { display: block; font-stretch: 100%; font-family: var(--font-body); font-size: .9rem; font-weight: 500; color: var(--ink-soft); margin-top: 6px; }
.mock-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; font-size: .92rem; }
.mock-list li { display: flex; gap: 10px; align-items: baseline; padding-top: 10px; border-top: 1px solid var(--line); }
.dot { width: 9px; height: 9px; border-radius: 50%; flex: none; transform: translateY(-1px); }
.dot.ok { background: #3a9a6a; }
.dot.wait { background: var(--accent); }
.mock-bubble {
  position: absolute; left: -36px; bottom: 0; width: min(330px, 90%);
  background: var(--primary); color: #fff; border-radius: 14px 14px 14px 3px;
  padding: 16px 18px; font-size: .88rem; box-shadow: var(--shadow); transform: rotate(1.5deg);
}
.mock-bubble p { margin: 0; }
.mock-bubble .reply { margin-top: 8px; padding-top: 8px; border-top: 1px solid rgba(255,255,255,.2); color: var(--accent); }

/* Sections */
.section { padding: 96px 0; }
.section.alt { background: var(--bg-alt); }
.section-title { max-width: 22em; }
.section-intro { color: var(--ink-soft); font-size: 1.08rem; max-width: 40em; margin-bottom: 44px; }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; margin-top: 36px; }

/* Pains */
.pains { padding-top: 0; }
.pain { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.pain-icon { font-size: 1.6rem; display: block; margin-bottom: 14px; color: var(--primary); }
.pain p { color: var(--ink-soft); font-size: .95rem; margin: 0; }

/* Cards */
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; transition: transform .2s, box-shadow .2s;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.card-icon {
  width: 48px; height: 48px; border-radius: var(--radius-sm); background: var(--primary-soft); color: var(--primary);
  display: grid; place-items: center; font-size: 1.5rem; margin-bottom: 18px;
}
.card p { color: var(--ink-soft); margin: 0; font-size: .97rem; }

/* Tabs */
.tabs { display: flex; flex-wrap: wrap; gap: 8px; margin: 32px 0 28px; }
.tab {
  font: 600 .95rem var(--font-body); padding: .7em 1.2em; border-radius: var(--radius-sm);
  border: 1px solid var(--line); background: var(--surface); color: var(--ink-soft); cursor: pointer;
}
.tab:hover { color: var(--ink); border-color: var(--ink-soft); }
.tab.is-active { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.tab:focus-visible, .btn:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.usecases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.usecase {
  background: var(--surface); border-radius: var(--radius); padding: 28px;
  border: 1px solid var(--line); display: flex; flex-direction: column;
}
.usecase p { color: var(--ink-soft); font-size: .97rem; flex: 1; }
.gain {
  align-self: flex-start; background: var(--primary-soft); color: var(--primary);
  font-weight: 600; font-size: .85rem; padding: 6px 12px; border-radius: 999px;
}
.tab-panel.is-active { animation: fade .3s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* Steps */
.steps { list-style: none; padding: 0; margin: 44px 0 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; counter-reset: none; }
.step { position: relative; padding-top: 8px; }
.step-num {
  display: grid; place-items: center; width: 52px; height: 52px; border-radius: 50%;
  background: var(--accent); font-family: var(--font-display); font-stretch: 125%; font-weight: 800; font-size: 1.3rem;
  margin-bottom: 18px; position: relative; z-index: 1;
}
.step:not(:last-child)::after {
  content: ""; position: absolute; top: 34px; left: 64px; right: -10px;
  border-top: 2px dashed var(--line);
}
.step p { color: var(--ink-soft); font-size: .97rem; }

/* Offers */
.offers { align-items: stretch; }
.offer {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px;
  display: flex; flex-direction: column; position: relative;
}
.offer.featured { border: 2px solid var(--primary); box-shadow: var(--shadow); }
.badge {
  position: absolute; top: -13px; left: 32px; background: var(--primary); color: #fff;
  font-size: .78rem; font-weight: 600; padding: 4px 12px; border-radius: var(--radius-sm);
}
.price { font-family: var(--font-display); font-stretch: 125%; font-size: 2rem; font-weight: 800; color: var(--primary); margin: 4px 0 8px; line-height: 1.1; }
.price small { display: block; font-stretch: 100%; font-family: var(--font-body); font-size: .85rem; font-weight: 500; color: var(--ink-soft); margin-top: 4px; }
.offer-desc { color: var(--ink-soft); }
.checks { list-style: none; padding: 0; margin: 8px 0 28px; display: grid; gap: 10px; flex: 1; align-content: start; }
.checks li { padding-left: 28px; position: relative; font-size: .97rem; }
.checks li::before {
  content: "✓"; position: absolute; left: 0; top: 1px; width: 20px; height: 20px; border-radius: 50%;
  background: var(--primary-soft); color: var(--primary); font-size: .72rem; font-weight: 700;
  display: grid; place-items: center;
}

.offers-note { margin: 32px 0 0; text-align: center; color: var(--ink-soft); }
.offers-note a { color: var(--primary); font-weight: 600; }

/* About */
.about { display: grid; grid-template-columns: 340px 1fr; gap: 64px; align-items: center; }
.about-photo {
  aspect-ratio: 4 / 5; border-radius: var(--radius); overflow: hidden; background: var(--primary);
}
.about-photo img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: 50% 35%; }
.about-copy > p { color: var(--ink-soft); }
.values { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 10px; }
.values li { padding: 14px 18px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm); }

/* FAQ */
.faq { margin-top: 36px; display: grid; gap: 12px; }
.faq details { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm); }
.faq summary {
  cursor: pointer; list-style: none; padding: 20px 56px 20px 22px; font-weight: 600; position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 22px; top: 50%; transform: translateY(-50%);
  font-size: 1.5rem; font-weight: 400; color: var(--primary); transition: transform .2s;
}
.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq details p { padding: 0 22px 20px; margin: 0; color: var(--ink-soft); }

/* Contact */
.contact { background: var(--primary); color: #fff; }
.contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 64px; align-items: start; }
.contact-copy > p { color: rgba(255,255,255,.8); font-size: 1.08rem; }
.contact-info { list-style: none; padding: 0; margin: 28px 0 0; display: grid; gap: 14px; }
.contact-info li { display: flex; gap: 12px; align-items: center; }
.contact-info .ico { color: var(--accent); font-size: 1.15rem; flex: none; }
.contact-info a { color: #fff; text-decoration: none; border-bottom: 1px solid rgba(255,255,255,.35); }
.contact-info a:hover { border-color: var(--accent); }

.contact-form {
  background: var(--surface); color: var(--ink); border-radius: var(--radius); padding: 32px;
  display: grid; gap: 16px; box-shadow: 0 20px 50px rgba(0,0,0,.18);
}
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact-form label { display: grid; gap: 6px; font-size: .9rem; font-weight: 600; }
.contact-form input:not([type="checkbox"]), .contact-form select, .contact-form textarea {
  font: 400 1rem var(--font-body); color: var(--ink);
  padding: 12px 14px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--bg);
  width: 100%;
}
.contact-form textarea { resize: vertical; }
.contact-form :is(input, select, textarea):focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.contact-form .invalid { border-color: #c2412d !important; }
.consent { display: flex !important; gap: 10px; align-items: flex-start; font-weight: 400 !important; font-size: .85rem !important; color: var(--ink-soft); }
.consent input { margin-top: 3px; accent-color: var(--primary); width: 16px; height: 16px; flex: none; }
.form-status { margin: 0; font-size: .92rem; min-height: 1.4em; }
.contact-form .hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-status.ok { color: var(--primary); }
.form-status.err { color: #c2412d; }

/* Footer */
.site-footer { padding: 28px 0; font-size: .9rem; color: var(--ink-soft); }
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.footer-inner p { margin: 0; }
.footer-inner nav { display: flex; gap: 20px; }
.footer-inner a { text-decoration: none; }
.footer-inner a:hover { color: var(--ink); text-decoration: underline; }

/* Reveal on scroll */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .tab-panel.is-active { animation: none; }
}

/* Legal page */
.legal { padding: 64px 0 96px; }
.legal h1 { font-size: clamp(2rem, 4vw, 2.8rem); }
.legal h2 { font-size: 1.4rem; margin-top: 2em; }
.legal p, .legal li { color: var(--ink-soft); }
.legal .todo { background: #fff4d6; padding: 0 4px; border-radius: 4px; color: var(--ink); }

/* Responsive */
@media (max-width: 980px) {
  .hero-grid, .about, .contact-grid { grid-template-columns: 1fr; gap: 48px; }
  .hero { padding-top: 48px; }
  .hero-visual { max-width: 480px; margin-inline: auto; width: 100%; }
  .mock-bubble { left: auto; right: 0; }
  .grid-3, .usecases { grid-template-columns: 1fr 1fr; }
  .grid-4, .steps { grid-template-columns: 1fr 1fr; }
  .step::after { display: none; }
  .about-photo { max-width: 280px; }
}

@media (max-width: 760px) {
  body { font-size: 16px; }
  .section { padding: 72px 0; }
  .nav-toggle { display: block; }
  .nav {
    position: fixed; inset: 72px 0 auto 0; background: var(--bg);
    flex-direction: column; align-items: stretch; gap: 0; padding: 8px 16px 20px;
    border-bottom: 1px solid var(--line); box-shadow: var(--shadow);
    transform: translateY(-110%); visibility: hidden; transition: transform .25s ease, visibility .25s;
    z-index: -1;
  }
  .nav.open { transform: none; visibility: visible; }
  .nav a:not(.btn) { padding: 14px 4px; border-bottom: 1px solid var(--line); font-size: 1.05rem; }
  .nav .btn { margin-top: 16px; }
  .grid-3, .grid-4, .usecases, .steps, .field-row { grid-template-columns: 1fr; }
  .hl { white-space: normal; }
  .mock-bubble { position: relative; left: auto; right: auto; margin: -20px 0 0 auto; }
  .hero-visual { padding-bottom: 0; }
  .contact-form, .offer { padding: 24px; }
  .tabs { flex-wrap: nowrap; overflow-x: auto; margin-inline: -16px; padding: 0 16px 4px; scrollbar-width: none; }
  .tabs::-webkit-scrollbar { display: none; }
  .tab { flex: none; }
}