:root {
  --ink: #0A1530;
  --ink-2: #13224A;
  --text: #1C2640;
  --muted: #5B6683;
  --line: #E3E8F2;
  --bg: #FFFFFF;
  --bg-alt: #F4F7FC;
  --primary: #2B5CFF;
  --primary-2: #00C2D1;
  --primary-dark: #1E46D6;
  --grad: linear-gradient(135deg, var(--primary), var(--primary-2));
  --radius: 14px;
  --shadow: 0 1px 2px rgba(10, 21, 48, .06), 0 8px 24px rgba(10, 21, 48, .06);
  --shadow-lg: 0 12px 40px rgba(10, 21, 48, .14);
  --font: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: "Segoe UI Variable Display", "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; } /* l'attribut hidden doit primer sur display: grid / flex */
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.6; font-size: 1.0625rem; }
img, svg { display: block; max-width: 100%; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { font-family: var(--font-display); color: var(--ink); line-height: 1.2; margin: 0 0 .6em; letter-spacing: -.01em; }
h1 { font-size: clamp(2.1rem, 4.6vw, 3.5rem); font-weight: 700; letter-spacing: -.02em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); font-weight: 700; }
h3, .h3 { font-size: 1.2rem; font-weight: 650; }
.h4 { font-size: 1.05rem; font-weight: 650; }
p { margin: 0 0 1em; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.dev-banner { background: #B45309; color: #fff; text-align: center; font-size: .85rem; font-weight: 600; padding: 6px 16px; }
.skip-link { position: absolute; left: -999px; top: 8px; background: var(--ink); color: #fff; padding: 8px 14px; border-radius: 8px; z-index: 100; }
.skip-link:focus { left: 8px; }
:focus-visible { outline: 3px solid var(--primary-2); outline-offset: 2px; }

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .container { padding: 0 28px; } }
.center { text-align: center; margin-top: 2.5rem; }
.mt { margin-top: 3rem; }

/* Boutons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .5em; padding: .75em 1.3em; border-radius: 10px; font-weight: 600; font-size: 1rem; border: 1.5px solid transparent; cursor: pointer; transition: transform .15s, box-shadow .15s, background .15s; text-decoration: none !important; font-family: inherit; }
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 6px 18px rgba(43, 92, 255, .3); }
.btn-primary:hover { box-shadow: 0 10px 24px rgba(43, 92, 255, .38); }
.btn-outline { border-color: var(--primary); color: var(--primary); background: transparent; }
.btn-ghost { border-color: rgba(255, 255, 255, .35); color: #fff; background: rgba(255, 255, 255, .06); }
.btn-light { background: #fff; color: var(--ink); }
.btn-sm { padding: .5em 1em; font-size: .92rem; }
.btn-lg { padding: .9em 1.6em; font-size: 1.05rem; }
.btn-block { width: 100%; }
.btn[disabled] { opacity: .6; cursor: progress; transform: none; }
.text-link { font-weight: 600; }

/* Logo */
.logo { display: inline-flex; align-items: center; gap: .55rem; text-decoration: none !important; }
.logo-mark { width: 38px; height: 38px; flex: none; }
.logo-word { font-family: var(--font-display); font-size: 1.5rem; font-weight: 700; color: var(--ink); letter-spacing: -.02em; }
.logo-word b { font-weight: 500; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.site-footer .logo-word b, .root-chooser .logo-word b { background: linear-gradient(90deg, #6F93FF, #33E1EC); -webkit-background-clip: text; background-clip: text; }

/* En-tête */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255, 255, 255, .9); backdrop-filter: saturate(160%) blur(12px); border-bottom: 1px solid var(--line); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.site-nav { display: flex; align-items: center; gap: 1.6rem; }
.site-nav a:not(.btn) { color: var(--text); font-weight: 550; font-size: .98rem; }
.site-nav a[aria-current="page"] { color: var(--primary); }
.lang-switch { padding: .3em .7em; border: 1px solid var(--line); border-radius: 8px; font-size: .88rem !important; }
.nav-toggle { display: none; background: none; border: 0; padding: 8px; cursor: pointer; }
.nav-toggle span:not(.sr-only) { display: block; width: 22px; height: 2px; background: var(--ink); margin: 5px 0; border-radius: 2px; transition: transform .2s, opacity .2s; }
@media (max-width: 960px) {
  .nav-toggle { display: block; }
  .site-nav { position: absolute; top: 72px; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; background: #fff; border-bottom: 1px solid var(--line); padding: 8px 16px 20px; box-shadow: var(--shadow-lg); display: none; }
  .site-nav.open { display: flex; }
  .site-nav a:not(.btn) { padding: 12px 4px; border-bottom: 1px solid var(--line); }
  .site-nav .lang-switch { border: 0; border-bottom: 1px solid var(--line); border-radius: 0; font-size: .98rem !important; }
  .site-nav .btn { margin-top: 14px; }
  .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 d'accueil */
.hero { position: relative; overflow: hidden; background: var(--ink); color: #C9D3EA; padding: 88px 0 96px; }
.hero-bg { position: absolute; inset: 0; background:
  radial-gradient(600px 400px at 85% 20%, rgba(0, 194, 209, .28), transparent 60%),
  radial-gradient(700px 500px at 10% 90%, rgba(43, 92, 255, .35), transparent 60%),
  linear-gradient(rgba(255, 255, 255, .04) 1px, transparent 1px) 0 0 / 44px 44px,
  linear-gradient(90deg, rgba(255, 255, 255, .04) 1px, transparent 1px) 0 0 / 44px 44px; }
.hero-inner { position: relative; display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; }
.hero h1 { color: #fff; }
.hero .lead { color: #C9D3EA; font-size: 1.18rem; max-width: 40em; }
.grad-text { background: linear-gradient(90deg, #6F93FF, #33E1EC); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 32px; }
.trust { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 10px 24px; font-size: .95rem; }
.trust li { display: flex; align-items: center; gap: 8px; }
.trust .icon-sm { color: var(--primary-2); }
@media (max-width: 960px) { .hero-inner { grid-template-columns: 1fr; } .hero-visual { display: none; } .hero { padding: 64px 0 72px; } }

/* Visuel « hub » */
.hub { position: relative; width: min(100%, 440px); aspect-ratio: 1; margin: 0 auto; }
.hub::before, .hub::after { content: ""; position: absolute; inset: 12%; border-radius: 50%; border: 1px dashed rgba(255, 255, 255, .18); }
.hub::after { inset: 30%; border-style: solid; border-color: rgba(0, 194, 209, .25); animation: pulse 4s ease-in-out infinite; }
.hub-core { position: absolute; left: 50%; top: 50%; width: 30%; transform: translate(-50%, -50%); filter: drop-shadow(0 0 24px rgba(0, 194, 209, .55)); }
.hub-core .logo-mark { width: 100%; height: auto; }
.hub-node { --a: 0deg; position: absolute; left: 50%; top: 50%; width: 84px; transform: translate(-50%, -50%) rotate(var(--a)) translateY(-190px) rotate(calc(-1 * var(--a))); display: flex; flex-direction: column; align-items: center; gap: 6px; font-style: normal; }
.hub-node .icon { width: 46px; height: 46px; padding: 11px; border-radius: 12px; background: rgba(255, 255, 255, .07); border: 1px solid rgba(255, 255, 255, .14); color: #fff; backdrop-filter: blur(6px); }
.hub-node em { font-style: normal; font-size: .72rem; color: #AFC0E6; text-align: center; line-height: 1.2; }
.n0 { --a: 0deg; } .n1 { --a: 45deg; } .n2 { --a: 90deg; } .n3 { --a: 135deg; } .n4 { --a: 180deg; } .n5 { --a: 225deg; } .n6 { --a: 270deg; } .n7 { --a: 315deg; }
@keyframes pulse { 0%, 100% { transform: scale(1); opacity: 1; } 50% { transform: scale(1.06); opacity: .6; } }
@media (max-width: 1100px) { .hub-node { transform: translate(-50%, -50%) rotate(var(--a)) translateY(-165px) rotate(calc(-1 * var(--a))); } }
@media (prefers-reduced-motion: reduce) { .hub::after { animation: none; } html { scroll-behavior: auto; } }

/* En-tête de page interne */
.page-hero { background: var(--ink); background-image: radial-gradient(600px 300px at 90% 0%, rgba(0, 194, 209, .25), transparent 60%), radial-gradient(600px 300px at 0% 100%, rgba(43, 92, 255, .3), transparent 60%); color: #C9D3EA; padding: 64px 0 56px; }
.page-hero h1 { color: #fff; font-size: clamp(1.9rem, 4vw, 3rem); display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.page-hero .lead { font-size: 1.15rem; max-width: 46em; margin: 0; }
.page-hero .eyebrow a { color: inherit; }
.hero-icon { display: inline-flex; width: 56px; height: 56px; padding: 12px; border-radius: 14px; background: var(--grad); color: #fff; }
.hero-icon .icon { width: 100%; height: 100%; }

/* Sections */
.section { padding: 88px 0; }
.section-alt { background: var(--bg-alt); }
.section-dark { background: var(--ink); color: #C9D3EA; }
.section-dark h2, .section-dark h3 { color: #fff; }
.section-head { max-width: 720px; margin-bottom: 44px; }
.section-head .lead { color: var(--muted); font-size: 1.1rem; }
.section-dark .section-head .lead { color: #AFC0E6; }
.eyebrow { text-transform: uppercase; letter-spacing: .12em; font-size: .8rem; font-weight: 700; color: var(--primary); margin-bottom: .8em; }
.eyebrow-light, .page-hero .eyebrow, .section-dark .eyebrow { color: var(--primary-2); }
@media (max-width: 720px) { .section { padding: 64px 0; } }

/* Grilles et cartes */
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 1000px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); color: var(--text); }
.card p { color: var(--muted); }
.pillar-card { display: flex; flex-direction: column; transition: transform .2s, box-shadow .2s, border-color .2s; text-decoration: none !important; }
.pillar-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: #C8D4F5; }
.pillar-card p { flex: 1; }
.card-icon { display: inline-flex; width: 48px; height: 48px; padding: 11px; border-radius: 12px; background: linear-gradient(135deg, rgba(43, 92, 255, .1), rgba(0, 194, 209, .12)); color: var(--primary); margin-bottom: 18px; }
.card-icon .icon { width: 100%; height: 100%; }
.card-link { display: inline-flex; align-items: center; gap: 6px; color: var(--primary); font-weight: 600; font-size: .95rem; }
.icon-sm { width: 18px; height: 18px; flex: none; }

.offer-card { display: flex; flex-direction: column; position: relative; overflow: hidden; }
.offer-card::before { content: ""; position: absolute; inset: 0 0 auto; height: 4px; background: var(--grad); }
.offer-top { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 14px; }
.badge { background: linear-gradient(135deg, rgba(43, 92, 255, .12), rgba(0, 194, 209, .16)); color: var(--primary-dark); font-weight: 700; font-size: .78rem; padding: .3em .75em; border-radius: 999px; text-transform: uppercase; letter-spacing: .05em; }
.offer-duration { font-size: .88rem; color: var(--muted); font-weight: 600; }
.offer-pitch { color: var(--text) !important; font-weight: 500; }
.offer-actions { margin-top: auto; padding-top: 16px; display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

.checklist { list-style: none; padding: 0; margin: 0 0 1em; }
.checklist li { display: flex; gap: 10px; align-items: flex-start; padding: 5px 0; color: var(--text); font-size: .97rem; }
.checklist .icon-sm { color: var(--primary-2); margin-top: 3px; }

.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; counter-reset: s; }
.steps li { position: relative; padding: 28px 24px; border-radius: var(--radius); background: var(--bg-alt); }
.steps p { color: var(--muted); margin: 0; }
.step-num { display: block; font-family: var(--font-display); font-size: 2rem; font-weight: 700; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; margin-bottom: 8px; }
@media (max-width: 1000px) { .steps { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .steps { grid-template-columns: 1fr; } }

.feature { padding: 26px; border-radius: var(--radius); background: rgba(255, 255, 255, .05); border: 1px solid rgba(255, 255, 255, .1); }
.feature p { margin: 0; }
.feature-light { background: #fff; border-color: var(--line); }
.feature-light p { color: var(--muted); }

/* Bandeau d'appel à l'action */
.cta-band { background: var(--grad); color: #fff; padding: 56px 0; }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.cta-band h2 { color: #fff; margin-bottom: .3em; }
.cta-band p { margin: 0; opacity: .92; max-width: 40em; }

/* Page pilier */
.pillar-layout { display: grid; grid-template-columns: 1fr 340px; gap: 48px; align-items: start; }
.intro { font-size: 1.15rem; color: var(--text); margin-bottom: 2rem; }
.service-item { padding: 22px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.service-item h3 { font-size: 1.05rem; }
.service-item p { margin: 0; color: var(--muted); font-size: .97rem; }
.pillar-aside { position: sticky; top: 96px; display: grid; gap: 18px; }
.aside-box { background: var(--bg-alt); border-radius: var(--radius); padding: 24px; }
.tags { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.tags li { background: #fff; border: 1px solid var(--line); border-radius: 999px; padding: .3em .8em; font-size: .88rem; color: var(--text); }
.tags-lg li { font-size: 1rem; padding: .5em 1.1em; background: var(--bg-alt); }
@media (max-width: 960px) { .pillar-layout { grid-template-columns: 1fr; } .pillar-aside { position: static; } }

/* À propos */
.about-mission { display: grid; grid-template-columns: 160px 1fr; gap: 40px; align-items: center; }
.mission-mark .logo-mark { width: 160px; height: 160px; filter: drop-shadow(0 16px 40px rgba(43, 92, 255, .3)); }
@media (max-width: 640px) { .about-mission { grid-template-columns: 1fr; } .mission-mark .logo-mark { width: 96px; height: 96px; } }

/* Contact */
.contact-layout { display: grid; grid-template-columns: 1fr 340px; gap: 48px; align-items: start; }
@media (max-width: 960px) { .contact-layout { grid-template-columns: 1fr; } }
.contact-form { display: grid; gap: 18px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 640px) { .field-row { grid-template-columns: 1fr; } }
.field { display: grid; gap: 6px; font-weight: 600; font-size: .95rem; color: var(--ink); }
.field input, .field select, .field textarea { font: inherit; font-weight: 400; color: var(--text); padding: .75em .9em; border: 1.5px solid var(--line); border-radius: 10px; background: #fff; width: 100%; transition: border-color .15s, box-shadow .15s; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 4px rgba(43, 92, 255, .12); }
.field .invalid, .field [aria-invalid="true"] { border-color: #D33; }
.file-drop { position: relative; display: block; border: 1.5px dashed #C8D4F5; border-radius: 10px; padding: 18px; text-align: center; background: var(--bg-alt); cursor: pointer; transition: border-color .15s, background .15s; }
.file-drop:hover, .file-drop:focus-within { border-color: var(--primary); background: #EEF3FF; }
.file-drop input { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; }
.file-drop-text { font-weight: 500; color: var(--muted); font-size: .92rem; }
.file-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }
.file-list li { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 8px; font-weight: 400; font-size: .92rem; word-break: break-all; }
.file-remove { background: none; border: 0; color: #C62828; font: inherit; font-weight: 600; cursor: pointer; flex: none; }
.brief-set { border: 0; padding: 0; margin: 0; display: grid; gap: 18px; min-width: 0; }
.checks { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.checks label { display: inline-flex; align-items: center; gap: 6px; font-weight: 400; color: var(--text); }
.checks input { width: 17px; height: 17px; }
.consent { display: flex; gap: 10px; align-items: flex-start; font-size: .92rem; color: var(--muted); }
.consent input { margin-top: 4px; width: 18px; height: 18px; flex: none; }
.contact-form .btn { justify-self: start; }
.form-status { min-height: 1.5em; font-weight: 600; margin: 0; }
.form-status.ok { color: #0A7F5A; }
.form-status.err { color: #C62828; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }

/* Texte long */
.prose { max-width: 760px; }
.prose h2 { font-size: 1.35rem; margin-top: 2em; }
.not-found { padding: 40px 0; }
.not-found hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }

/* Pied de page */
.site-footer { background: #070F24; color: #94A3C6; padding: 64px 0 28px; font-size: .95rem; }
.site-footer a { color: #C9D3EA; }
.site-footer .logo-word { color: #fff; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; }
.footer-tagline { margin-top: 16px; max-width: 30em; }
.footer-title { color: #fff; font-size: .9rem; text-transform: uppercase; letter-spacing: .1em; margin-bottom: 1em; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, .08); margin-top: 48px; padding-top: 22px; font-size: .88rem; }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr; } }

/* Page racine */
.root-chooser { min-height: 100vh; display: grid; place-items: center; background: var(--ink); }
.root-chooser main { display: grid; justify-items: center; gap: 24px; }
.root-chooser .logo-mark { width: 72px; height: 72px; }
.root-chooser .btn-outline { color: #fff; border-color: rgba(255, 255, 255, .4); }