/* VEXTRA V4 — design tokens + composants.
   Palette DÉRIVÉE DES ACTIFS DE MARQUE (mesure du 12/10/2026 sur
   assets/brand/landing-240px.png, image de référence de la marque) :
     - fonds/surfaces : bleus marine profonds mesurés (#000820 → #002040)
     - accent (interactions, CTA) : cyan mesuré sur le glyphe (#00c0f0)
     - texte : blanc cassé ; contrôles vérifiés par axe-core (WCAG A/AA)
   Séparation : tokens (§1) → composants (§2) → sections (§3) → responsive (§4).
   Contraintes : aucun remote, CSP style 'self' (AUCUN style inline, aucune injection JS
   de style), prefers-reduced-motion respecté. */

/* ── §1 TOKENS ─────────────────────────────────────────────── */
:root {
  --bg: #050d1c;
  --surface: #0a1730;
  --surface-2: #102244;
  --line: #1d3357;
  --fg: #eef4fb;
  --muted: #a9bcd6;
  --accent: #22c9f0;
  --accent-strong: #67e8f9;
  --accent-fg: #04101f;
  --ok: #34d399;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --step--1: clamp(0.83rem, 0.8rem + 0.15vw, 0.9rem);
  --step-0: clamp(1rem, 0.96rem + 0.2vw, 1.08rem);
  --step-1: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
  --step-2: clamp(1.6rem, 1.4rem + 1vw, 2.1rem);
  --step-3: clamp(2.1rem, 1.7rem + 2vw, 3rem);
  --step-4: clamp(2.7rem, 2rem + 3.4vw, 4.4rem);
  --sp-1: 0.5rem; --sp-2: 0.75rem; --sp-3: 1rem; --sp-4: 1.5rem;
  --sp-5: 2.25rem; --sp-6: 3.5rem; --sp-7: 5.5rem;
  --radius: 14px; --radius-sm: 9px;
  --max: 70rem;
  --focus: 3px;
  --header-h: 4.25rem;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font-family: var(--font); font-size: var(--step-0); line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
:focus-visible { outline: var(--focus) solid var(--accent); outline-offset: 3px; border-radius: 4px; }
::selection { background: var(--accent); color: var(--accent-fg); }

.wrap { width: min(100% - 2.5rem, var(--max)); margin-inline: auto; }
.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--accent); color: var(--accent-fg);
  padding: var(--sp-2) var(--sp-3); font-weight: 700; border-radius: 0 0 var(--radius-sm) 0;
}
.skip:focus { left: 0; }
.eyebrow {
  text-transform: uppercase; letter-spacing: 0.14em; font-size: var(--step--1);
  color: var(--accent); font-weight: 700; margin: 0 0 var(--sp-2);
}
.sec-n {
  font-family: var(--font-mono); color: var(--muted); margin-right: 0.6rem;
  border: 1px solid var(--line); border-radius: 999px; padding: 0.05rem 0.5rem;
}
.lede { color: var(--muted); font-size: var(--step-1); line-height: 1.5; max-width: 46rem; }
.muted { color: var(--muted); }
.grad { background: linear-gradient(100deg, var(--accent) 15%, #a5f3fc 55%, var(--accent-strong));
  -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ── §2 COMPOSANTS ─────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.8rem 1.5rem; border-radius: 999px; font-weight: 700;
  font-size: var(--step-0); text-decoration: none; border: 1.5px solid transparent;
  cursor: pointer; transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}
.btn-primary { background: var(--accent); color: var(--accent-fg); }
.btn-primary:hover { background: var(--accent-strong); transform: translateY(-2px); }
.btn-ghost { border-color: var(--line); color: var(--fg); background: transparent; }
.btn-ghost:hover { border-color: var(--accent); transform: translateY(-2px); }
.card {
  position: relative; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: var(--sp-4);
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.card::before {
  content: ""; position: absolute; left: 0; top: var(--sp-4); bottom: var(--sp-4);
  width: 3px; border-radius: 999px; background: var(--accent);
  transform: scaleY(0); transform-origin: top; transition: transform 0.25s ease;
}
.card:hover, .card:focus-within { transform: translateY(-4px); border-color: var(--accent); background: var(--surface-2); }
.card:hover::before, .card:focus-within::before { transform: scaleY(1); }
.card-mark {
  display: block; font-size: 1.35rem; line-height: 1; color: var(--accent);
  margin-bottom: var(--sp-2); opacity: 0.9;
}
.card h3 { margin: 0 0 var(--sp-1); font-size: var(--step-1); }
.card p { margin: 0; color: var(--muted); }
.tag {
  display: inline-block; font-family: var(--font-mono); font-size: 0.72rem;
  background: var(--surface-2); border: 1px solid var(--line); color: var(--muted);
  padding: 0.15rem 0.55rem; border-radius: 999px; margin: 0.15rem 0.25rem 0 0;
}
.pending {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 0.4rem; aspect-ratio: 16 / 10; border: 1.5px dashed var(--line);
  border-radius: var(--radius-sm); background: var(--surface-2);
  color: var(--muted); font-size: var(--step--1); text-align: center; padding: var(--sp-3);
}
.pending-inline { aspect-ratio: auto; max-width: 32rem; }
.grid { display: grid; gap: var(--sp-3); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr)); }

.panel-head {
  display: flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono); font-size: var(--step--1); color: var(--muted);
  margin-bottom: var(--sp-3);
}
.panel-dot { width: 8px; height: 8px; border-radius: 999px; background: var(--ok); }

/* Carte système interactive (démonstration vivante du hero) */
.sysmap {
  margin: 0; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: var(--sp-4);
}
.sysmap-nodes { list-style: none; display: flex; flex-wrap: wrap; gap: var(--sp-1); margin: 0 0 var(--sp-3); padding: 0; }
.node {
  font-family: var(--font-mono); font-size: var(--step--1);
  background: var(--surface-2); color: var(--muted);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 0.3rem 0.8rem; cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}
.node:hover { color: var(--fg); border-color: var(--accent); }
.node.is-active { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); font-weight: 700; }
.sysmap-schema { width: 100%; height: auto; display: block; color: var(--line); margin-bottom: var(--sp-3); }
.sysmap-schema .dots circle { fill: var(--surface-2); stroke: var(--line); stroke-width: 1; transition: fill 0.2s ease, stroke 0.2s ease; }
.sysmap-schema .dots circle.is-active { fill: var(--accent); stroke: var(--accent); }
.sysmap-schema .link { stroke-dasharray: 5 5; }
.js-motion .sysmap-schema .link { animation: flow 2.2s linear infinite; }
.sysmap-desc { margin: 0; color: var(--muted); font-size: var(--step--1); min-height: 3.2em; }
.sysmap-desc b { color: var(--fg); }
@keyframes flow { to { stroke-dashoffset: -20; } }

/* ── HEADER / NAV ──────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--line);
}
.scroll-progress {
  position: absolute; left: 0; bottom: -1px; height: 2px; width: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-strong));
  transform: scaleX(0); transform-origin: left; display: none;
}
@supports (animation-timeline: scroll()) {
  .scroll-progress {
    display: block;
    animation: grow linear;
    animation-timeline: scroll(root);
  }
}
@keyframes grow { to { transform: scaleX(1); } }
.header-in { display: flex; align-items: center; justify-content: space-between;
  min-height: var(--header-h); gap: var(--sp-3); }
.brand { display: inline-flex; align-items: center; gap: 0.6rem;
  color: var(--fg); text-decoration: none; font-weight: 800; letter-spacing: 0.01em; }
.brand img { width: 30px; height: 30px; border-radius: 7px; }
.brand-dot { color: var(--accent); }
.nav ul { display: flex; gap: var(--sp-3); list-style: none; margin: 0; padding: 0; align-items: center; }
.nav a:not(.btn) { color: var(--muted); text-decoration: none; font-weight: 600; font-size: var(--step--1); }
.nav a:not(.btn):hover { color: var(--fg); }
.burger {
  display: none; background: none; border: 1.5px solid var(--line); border-radius: var(--radius-sm);
  color: var(--fg); padding: 0.45rem 0.7rem; font-size: 1rem; cursor: pointer;
}

/* ── §3 SECTIONS ───────────────────────────────────────────── */
.hero { position: relative; overflow: hidden; padding: var(--sp-6) 0; }
.hero-decor { position: absolute; inset: 0; z-index: 0; pointer-events: none; }
.orb { position: absolute; border-radius: 999px; filter: blur(70px); opacity: 0.35; will-change: transform; }
.orb-1 { width: 26rem; height: 26rem; top: -9rem; right: -6rem;
  background: radial-gradient(circle, var(--accent) 0%, transparent 70%); opacity: 0.25;
  animation: drift 24s ease-in-out infinite alternate; }
.orb-2 { width: 18rem; height: 18rem; bottom: -7rem; left: -5rem;
  background: radial-gradient(circle, #1e40af 0%, transparent 70%); opacity: 0.35;
  animation: drift 30s ease-in-out infinite alternate-reverse; }
.pattern { position: absolute; inset: 0; opacity: 0.5;
  background-image: radial-gradient(var(--line) 1px, transparent 1px); background-size: 26px 26px;
  mask-image: linear-gradient(to bottom, #000 0%, transparent 75%); }
.hero-grid {
  position: relative; z-index: 1; display: grid; gap: var(--sp-5);
  grid-template-columns: 1fr; align-items: center;
}
.hero-content { position: relative; }
.hero h1 { font-size: var(--step-4); line-height: 1.03; letter-spacing: -0.02em;
  margin: 0 0 var(--sp-3); max-width: 20ch; }
.hero .lede { margin: 0 0 var(--sp-4); }
.hero-ctas { display: flex; flex-wrap: wrap; gap: var(--sp-2); }
.pillars { list-style: none; display: grid; gap: var(--sp-2); margin: 0 0 var(--sp-4); padding: 0; }
.pillar {
  display: grid; grid-template-columns: 8.5rem 1fr; gap: var(--sp-2); align-items: baseline;
  border-left: 2px solid var(--line); padding-left: var(--sp-3);
  transition: border-color 0.2s ease;
}
.pillar:hover { border-color: var(--accent); }
.pillar-k { font-family: var(--font-mono); font-size: var(--step--1); color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.08em; }
.pillar-v { color: var(--muted); font-size: var(--step--1); }

section { padding: var(--sp-6) 0; border-top: 1px solid var(--line); }
section h2 { font-size: var(--step-3); line-height: 1.1; letter-spacing: -0.01em; margin: 0 0 var(--sp-3); max-width: 24ch; }
.sec-head { max-width: 52rem; margin-bottom: var(--sp-4); }
.sec-head p { color: var(--muted); margin: 0; }

/* Études de cas */
.case {
  display: grid; grid-template-columns: 1fr; gap: var(--sp-4);
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: var(--sp-4); margin-bottom: var(--sp-4);
}
.case:last-child { margin-bottom: 0; }
.case-kicker {
  font-family: var(--font-mono); font-size: var(--step--1); color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.1em; margin: 0 0 var(--sp-1);
}
.case h3 { margin: 0 0 var(--sp-3); font-size: var(--step-2); line-height: 1.2; }
.case-grid { display: grid; grid-template-columns: 1fr; gap: var(--sp-3); margin: 0 0 var(--sp-3); }
.case-grid dt {
  font-family: var(--font-mono); font-size: var(--step--1); color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 0.15rem;
}
.case-grid dd { margin: 0; color: var(--muted); }
.case-visual { margin: 0; }
.case-visual img { border-radius: var(--radius-sm); border: 1px solid var(--line); width: 100%; }
.case-visual figcaption { color: var(--muted); font-family: var(--font-mono); font-size: 0.72rem; margin-top: var(--sp-1); }
.case-pending { background: transparent; }

/* Timeline méthode */
.timeline { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--sp-3);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr)); }

.step { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: var(--sp-4);
  transition: transform 0.2s ease, border-color 0.2s ease; }
.step:hover { transform: translateY(-3px); border-color: var(--accent); }
.step-n { display: inline-flex; align-items: center; justify-content: center;
  width: 2.1rem; height: 2.1rem; border-radius: 999px; background: var(--accent);
  color: var(--accent-fg); font-weight: 800; margin-bottom: var(--sp-2); }
.step h3 { margin: 0 0 var(--sp-1); font-size: var(--step-1); }
.step p { margin: 0; color: var(--muted); }

.proof { list-style: none; margin: var(--sp-3) 0 0; padding: 0; display: grid; gap: var(--sp-2); }
.proof li { display: flex; gap: 0.6rem; align-items: baseline; color: var(--muted); }
.proof li::before { content: "✔"; color: var(--accent); font-weight: 700; }

.founder { display: grid; grid-template-columns: 1fr; gap: var(--sp-4); }
.founder blockquote { margin: 0; border-left: 3px solid var(--accent); padding-left: var(--sp-3);
  color: var(--muted); font-size: var(--step-1); line-height: 1.5; }

.contact-list { list-style: none; padding: 0; margin: var(--sp-3) 0 0; display: grid; gap: var(--sp-2); }
.contact-list a { font-size: var(--step-1); font-weight: 700; overflow-wrap: anywhere; }
.contact-loc { margin-top: var(--sp-3); }

.site-footer { border-top: 1px solid var(--line); padding: var(--sp-5) 0; color: var(--muted); font-size: var(--step--1); }
.footer-in { display: flex; flex-wrap: wrap; gap: var(--sp-3); justify-content: space-between; align-items: center; }
.footer-in a { color: var(--muted); }
.footer-in a:hover { color: var(--accent); }

/* Révélation progressive (JS only, masquée uniquement si .js-motion) */
.js-motion .reveal { opacity: 0; transform: translateY(18px); transition: opacity .45s ease, transform .45s ease; }
.js-motion .reveal.is-visible { opacity: 1; transform: none; }
.js-motion .grid > .card:nth-child(2), .js-motion .timeline > .step:nth-child(2) { transition-delay: 0.06s; }
.js-motion .grid > .card:nth-child(3), .js-motion .timeline > .step:nth-child(3) { transition-delay: 0.12s; }
.js-motion .grid > .card:nth-child(4), .js-motion .timeline > .step:nth-child(4) { transition-delay: 0.18s; }
.js-motion .timeline > .step:nth-child(5) { transition-delay: 0.24s; }

@keyframes drift { from { transform: translate3d(0,0,0) } to { transform: translate3d(-2.5rem, 2rem, 0) } }

/* ── §4 RESPONSIVE ─────────────────────────────────────────── */
@media (min-width: 62rem) {
  .hero-grid { grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); }
  .case { grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr); align-items: start; }
  .case-grid { grid-template-columns: 1fr 1fr; }
  .case-pending { grid-template-columns: 1fr; }
}
@media (max-width: 56rem) {
  .burger { display: inline-block; }
  .nav { position: absolute; left: 0; right: 0; top: 100%;
    background: var(--surface); border-bottom: 1px solid var(--line);
    display: none; padding: var(--sp-3) 1.25rem; }
  .nav.open { display: block; }
  .nav ul { flex-direction: column; align-items: flex-start; gap: var(--sp-2); }
  .nav a:not(.btn) { font-size: var(--step-0); }
  .orb { filter: blur(40px); opacity: 0.25; }
  .pillar { grid-template-columns: 1fr; gap: 0.1rem; }
}
@media (max-width: 30rem) {
  .hero h1 { font-size: clamp(2.1rem, 11vw, 2.7rem); }
  .btn { width: 100%; justify-content: center; }
  .contact-list a { font-size: var(--step-0); }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important; animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important; scroll-behavior: auto !important;
  }
  .js-motion .reveal { opacity: 1; transform: none; }
  .scroll-progress { display: none; }
}
@media print { .site-header, .hero-decor, .burger, .scroll-progress { display: none; } body { background: #fff; color: #000; } }