:root {
  --ink: #F5F7FA;
  --ink-soft: #93A0BD;
  --paper: #0A0E17;
  --paper-alt: #131B2E;
  --surface: #121A2C;
  --line: #24314E;
  --signal: #2F6FED;
  --signal-dark: #5B9CFF;
  --wire: #0EA5E9;
  --radius: 14px;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'IBM Plex Sans', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  background-color: var(--paper);
  background-image: radial-gradient(rgba(255,255,255,0.07) 1px, transparent 1px);
  background-size: 26px 26px;
  color: var(--ink);
  line-height: 1.55;
  overflow-x: hidden;
}

.wrap {
  max-width: 1800px;
  margin: 0 auto;
  padding: 0 48px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--signal);
  color: #ffffff;
  padding: 10px 16px;
  z-index: 100;
}
.skip-link:focus { left: 16px; top: 16px; }

h1, h2, h3 {
  font-family: var(--font-display);
  color: var(--ink);
  letter-spacing: -0.01em;
  margin: 0 0 16px;
}
h1 { font-size: clamp(2rem, 4.5vw, 3.8rem); line-height: 1.1; }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
h3 { font-size: 1.15rem; margin-bottom: 8px; }

p { margin: 0 0 12px; color: var(--ink-soft); }

a { color: var(--wire); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--signal-dark);
  margin: 0 0 10px;
  font-weight: 500;
}

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(10,14,23,0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  z-index: 20;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
}
.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.55rem;
  color: var(--ink);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 12px;
}
.logo-mark { width: 34px; height: 34px; flex-shrink: 0; }
.logo-text { display: inline-flex; align-items: flex-end; line-height: 1; }
.logo-ia-mark { height: 0.62em; width: auto; margin-left: 2px; margin-bottom: 3px; }

.main-nav { display: flex; align-items: center; gap: 22px; }
.main-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
}
.main-nav a:hover { color: var(--ink); }
.nav-cta {
  background: linear-gradient(135deg, var(--signal), var(--wire));
  color: #ffffff !important;
  padding: 9px 16px;
  border-radius: 999px;
  font-size: 0.85rem !important;
  flex-shrink: 0;
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 13px 24px;
  border-radius: 10px;
  font-weight: 600;
  text-decoration: none;
  font-size: 0.95rem;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.btn-primary {
  background: linear-gradient(135deg, var(--signal), var(--wire));
  color: #FFFFFF;
  box-shadow: 0 6px 20px rgba(47,111,237,0.4);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 8px 24px rgba(47,111,237,0.5); }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1.5px solid var(--line);
}
.btn-ghost:hover { border-color: var(--signal-dark); }

/* --- Hero --- */
.hero { padding: 64px 0 24px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}
.hero-sub { font-size: 0.95rem; max-width: 52ch; }
.hero-actions { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }

.hero-diagram { display: flex; align-items: center; justify-content: center; }
.hero-diagram svg { width: 100%; height: auto; max-width: 480px; }

.node rect {
  fill: var(--surface);
  stroke: var(--line);
  stroke-width: 1.5;
}
.node text {
  font-family: var(--font-mono);
  font-size: 12px;
  fill: var(--ink-soft);
  text-anchor: middle;
  dominant-baseline: middle;
}
.node-center rect { fill: var(--signal); stroke: var(--signal); }
.node-center text { fill: #ffffff; }

.flow-line {
  fill: none;
  stroke: var(--line);
  stroke-width: 2;
  stroke-dasharray: 400;
  stroke-dashoffset: 400;
  animation: draw-line 1.3s ease forwards;
}
.flow-line-out {
  stroke: var(--wire);
  animation-delay: 1.1s;
}
@keyframes draw-line {
  to { stroke-dashoffset: 0; }
}

.node-pulse {
  fill: var(--wire);
  animation: pulse 1.8s ease-in-out infinite;
  animation-delay: 1.6s;
}
@keyframes pulse {
  0%, 100% { r: 8; opacity: 0.8; }
  50% { r: 13; opacity: 1; }
}
.node-out-label {
  font-family: var(--font-mono);
  font-size: 11px;
  fill: var(--ink-soft);
}

/* --- Sections génériques --- */
.section { padding: 56px 0; scroll-margin-top: 73px; }
.section-alt { background: var(--paper-alt); }

/* --- Problème --- */
.problem-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 32px;
}
.problem-card {
  border-top: 2px solid var(--line);
  padding-top: 16px;
}
.problem-num {
  font-family: var(--font-mono);
  color: var(--signal-dark);
  font-size: 0.85rem;
  margin: 0 0 6px;
}

/* --- Steps --- */
.steps {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  gap: 28px;
}
.steps li {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}
.step-index {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 500;
  color: #ffffff;
  background: linear-gradient(135deg, var(--signal), var(--wire));
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* --- Exemples --- */
.example-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-top: 32px;
}
.example-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}
.example-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--wire);
  margin-bottom: 10px;
}

/* --- Section "par écrit" --- */
.written-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: start;
}
.written-lead { font-size: 1.02rem; }
.written-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.written-list li {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--ink);
}

/* --- Tarifs --- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 32px;
}
.pricing-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
}
.pricing-card-highlight { border-color: var(--line); }
.price {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--ink);
  margin: 4px 0;
}
.price-note { font-size: 0.85rem; margin-bottom: 16px; }
.pricing-card ul { margin: 0; padding-left: 18px; color: var(--ink-soft); font-size: 0.92rem; }
.pricing-card li { margin-bottom: 6px; }

/* --- Contact --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 40px;
  align-items: start;
}
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
}
.contact-form label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  margin-top: 12px;
}
.contact-form input,
.contact-form textarea {
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 11px 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--wire);
  box-shadow: 0 0 0 3px rgba(14,165,233,0.2);
}
.contact-form button { margin-top: 18px; align-self: flex-start; }
.form-note { font-size: 0.78rem; margin-top: 10px; color: var(--ink-soft); }

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 40px;
}
.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-grid p { margin: 0; font-size: 0.85rem; color: var(--ink-soft); }
.footer-grid nav { display: flex; gap: 20px; }
.footer-grid nav a { font-size: 0.85rem; text-decoration: none; }

/* --- Reveal on scroll --- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* --- Responsive --- */
@media (max-width: 980px) {
  .hero-grid, .written-grid, .contact-grid { grid-template-columns: 1fr; }
  .hero-diagram { order: -1; max-width: 320px; margin: 0 auto 20px; }
  .problem-grid, .example-grid, .pricing-grid { grid-template-columns: 1fr; }
  .main-nav { gap: 16px; }
  .main-nav a:not(.nav-cta) { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .flow-line, .node-pulse, .reveal { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}

/* --- Blog : liste d'articles --- */
.blog-hero { padding: 56px 0 24px; }
.blog-list {
  display: grid;
  gap: 20px;
  margin-top: 32px;
}
.blog-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  text-decoration: none;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.blog-card:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(0,0,0,0.35); }
.blog-card .blog-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--wire);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.blog-card h2 { font-size: 1.25rem; margin: 8px 0 8px; color: var(--ink); }
.blog-card p { margin: 0; color: var(--ink-soft); }
.blog-card .read-more { display: inline-block; margin-top: 12px; font-family: var(--font-mono); font-size: 0.82rem; color: var(--signal-dark); }

/* --- Article de blog : typographie longue lecture --- */
.article-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-soft);
  text-decoration: none;
  margin-bottom: 24px;
}
.article-back:hover { color: var(--wire); }

.article-header {
  padding: 40px 0 32px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
}
.article-header .blog-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--wire);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--paper-alt);
  padding: 4px 12px;
  border-radius: 999px;
  display: inline-block;
}
.article-header h1 { margin: 16px 0 12px; max-width: 18ch; }
.article-meta-row {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--ink-soft);
  font-size: 0.88rem;
  font-family: var(--font-mono);
}
.article-meta-row .dot-sep { width: 4px; height: 4px; border-radius: 50%; background: var(--line); }

.article-body {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 24px 24px;
}
.article-body p { font-size: 1.05rem; color: var(--ink-soft); margin-bottom: 20px; line-height: 1.7; }
.article-body h2 {
  margin-top: 44px;
  font-size: 1.45rem;
  padding-top: 8px;
}
.article-body h3 { margin-top: 30px; font-size: 1.12rem; }
.article-body ul, .article-body ol { color: var(--ink-soft); font-size: 1.05rem; padding-left: 22px; margin-bottom: 20px; line-height: 1.7; }
.article-body li { margin-bottom: 10px; }
.article-body blockquote {
  border-left: 3px solid var(--signal);
  background: var(--paper-alt);
  margin: 28px 0;
  padding: 16px 22px;
  border-radius: 0 10px 10px 0;
  color: var(--ink);
  font-style: italic;
  font-size: 1.02rem;
}
.article-cta {
  margin-top: 40px;
  padding: 28px 24px;
  background: linear-gradient(135deg, var(--signal), var(--wire));
  border-radius: var(--radius);
  text-align: center;
}
.article-cta p { color: #ffffff; font-weight: 500; margin-bottom: 16px; font-size: 1.05rem; }
.article-cta .btn-primary { background: #ffffff; color: var(--paper); box-shadow: none; }

/* --- Articles liés --- */
.related-articles {
  max-width: 680px;
  margin: 0 auto;
  padding: 40px 24px 64px;
  border-top: 1px solid var(--line);
}
.related-articles .eyebrow { margin-bottom: 16px; }
.related-grid {
  display: grid;
  gap: 14px;
}
.related-card {
  display: block;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  text-decoration: none;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.related-card:hover { transform: translateY(-2px); box-shadow: 0 8px 18px rgba(0,0,0,0.3); }
.related-card .blog-date { font-family: var(--font-mono); font-size: 0.72rem; color: var(--wire); text-transform: uppercase; }
.related-card h3 { margin: 6px 0 0; font-size: 1rem; color: var(--ink); }

/* --- FAQ --- */
.faq-hero { padding: 56px 0 16px; }
.faq-list { margin-top: 24px; }
.faq-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  box-shadow: none;
  padding: 18px 20px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  color: var(--ink);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.faq-question:hover { transform: none; }
.faq-question .icon { font-family: var(--font-mono); color: var(--wire); flex-shrink: 0; transition: transform 0.2s ease; }
.faq-item.open .faq-question .icon { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
  padding: 0 20px;
}
.faq-item.open .faq-answer { max-height: 400px; padding: 0 20px 20px; }
.faq-answer p { color: var(--ink-soft); margin: 0; font-size: 0.96rem; }

/* Logo agrandi */
.site-header .logo-mark { height: 52px; width: auto; margin-right: 14px; }
.site-header .logo-text { font-size: 38px; }
.site-header .logo-ia-mark { width: 48px; height: 48px; }

/* EXTENDIA-LOGO-CSS-START */
.site-header .logo .logo-text { font-size: clamp(24px, 9vw, 38px); }
.site-header .logo .logo-ia-mark {
  width: 1.4em;
  height: 1.4em;
  vertical-align: -0.32em;
  margin: 0 0.04em;
}
/* EXTENDIA-LOGO-CSS-END */

/* EXTENDIA-WRAP-MOBILE-START */
@media (max-width: 768px) {
  .wrap {
    padding-left: 0 !important;
    padding-right: 0 !important;
    margin-left: 0 !important;
    margin-right: 0 !important;
    max-width: 100% !important;
  }
}
/* EXTENDIA-WRAP-MOBILE-END */

/* EXTENDIA-LOGO-ALIGN */
.site-header .logo-text { align-items: center !important; }

/* EXTENDIA-PRICING-CSS-START */
.pricing-duo { display:flex; flex-wrap:wrap; gap:1.5rem; margin:0.7rem 0 0.5rem; }
.pricing-duo > div { display:flex; flex-direction:column; }
.duo-label { font-size:0.8rem; opacity:0.6; margin-bottom:3px; }
.duo-value { font-size:1.62rem; font-weight:700; line-height:1.1; }
.duo-unit { font-size:0.78rem; font-weight:500; opacity:0.6; }
.pricing-card ul { margin-top:0.5rem; }
.pricing-card ul li { padding:0.5rem 0; font-size:1.05rem; }
.pricing-card ul li.plus { font-weight:600; }
/* EXTENDIA-PRICING-CSS-END */

/* EXTENDIA-MOBILE-TWEAKS-START */
@media (max-width: 640px) {
  .site-header .logo .logo-text { font-size: clamp(20px, 7vw, 30px); }
  .site-header .nav-cta { font-size: 0.82rem; padding: 0.5rem 0.95rem; }
  .wrap { padding-left: 14px !important; padding-right: 14px !important; }
}
/* EXTENDIA-MOBILE-TWEAKS-END */