/* ==========================================================================
   LTSA — Feuille de style principale
   Identité : vert sauge (badge historique LTSA), papier chaud, encre profonde.
   ========================================================================== */

:root{
  /* Palette — dérivée de l'identité LTSA existante (carte de visite) */
  --sage-900:#1B2016;
  --sage-800:#2E3626;
  --sage-700:#47563C;
  --sage-600:#5C6B4E;
  --sage-500:#6E7F5E;
  --sage-400:#8A9878;
  --sage-300:#A9B79A;
  --sage-200:#C9D5BA;
  --sage-100:#E4E9DB;

  --paper:#F6F4EC;
  --paper-dim:#EDEAE0;
  --white:#FFFFFF;

  --ink:#1B2016;
  --ink-soft:#3C4434;
  --ink-faint:#5B6555;

  --line: rgba(27,32,22,0.12);
  --line-on-dark: rgba(246,244,236,0.18);

  --shadow-sm: 0 1px 2px rgba(27,32,22,0.06), 0 1px 1px rgba(27,32,22,0.04);
  --shadow-md: 0 8px 24px -8px rgba(27,32,22,0.18);
  --shadow-lg: 0 24px 64px -16px rgba(27,32,22,0.28);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "Cascadia Mono", "SF Mono", Consolas, "Roboto Mono", monospace;

  --container: 1200px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 22px;
  --radius-pill: 999px;

  --ease: cubic-bezier(.22,.68,0,1);
  --dur: .5s;
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
*{margin:0;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation-duration:0.001ms !important;animation-iteration-count:1 !important;transition-duration:0.001ms !important;scroll-behavior:auto !important;}
}
body{
  min-height:100vh;
  min-height:100svh;
  font-family:var(--font-sans);
  color:var(--ink);
  background:var(--paper);
  line-height:1.6;
  font-size:16px;
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
}
img,picture,svg,video{display:block;max-width:100%;height:auto;}
a{color:inherit;text-decoration:none;}
ul,ol{list-style:none;padding:0;}
button,input,textarea,select{font:inherit;color:inherit;}
button{cursor:pointer;background:none;border:none;}
h1,h2,h3,h4{text-wrap:balance;font-weight:700;letter-spacing:-0.02em;line-height:1.08;}
p{text-wrap:pretty;}
table{border-collapse:collapse;width:100%;}

:focus-visible{
  outline:2.5px solid var(--sage-600);
  outline-offset:3px;
  border-radius:4px;
}
.on-dark :focus-visible{outline-color:var(--sage-200);}

.skip-link{
  position:absolute;left:16px;top:-60px;z-index:1000;
  background:var(--ink);color:var(--paper);
  padding:12px 18px;border-radius:var(--radius-sm);
  transition:top .2s var(--ease);
  font-weight:600;font-size:.9rem;
}
.skip-link:focus{top:16px;}

/* ---------- Layout helpers ---------- */
.container{max-width:var(--container);margin-inline:auto;padding-inline:24px;}
@media (min-width:900px){.container{padding-inline:40px;}}

.section{padding-block:clamp(64px,9vw,120px);}
.section-tight{padding-block:clamp(40px,6vw,72px);}

.section-head{max-width:680px;margin-bottom:clamp(36px,5vw,56px);}
.section-head.center{margin-inline:auto;text-align:center;}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);
  font-size:.75rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--sage-600);font-weight:600;margin-bottom:14px;
}
.eyebrow::before{
  content:"";width:18px;height:1px;background:var(--sage-600);
}
.on-dark .eyebrow{color:var(--sage-200);}
.on-dark .eyebrow::before{background:var(--sage-200);}

h1{font-size:clamp(2.6rem,2.05rem + 2.4vw,4.5rem);}
h2{font-size:clamp(1.9rem,1.6rem + 1.3vw,2.9rem);}
h3{font-size:clamp(1.3rem,1.18rem + .5vw,1.6rem);}
.lede{font-size:clamp(1.05rem,1rem + .3vw,1.25rem);color:var(--ink-soft);line-height:1.65;}
.muted{color:var(--ink-faint);}
.on-dark{color:var(--paper);}
.on-dark .muted{color:var(--sage-200);}
.on-dark .lede{color:var(--sage-100);}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:15px 28px;border-radius:var(--radius-pill);
  font-weight:600;font-size:.95rem;letter-spacing:-0.005em;
  transition:transform .35s var(--ease),background-color .25s var(--ease),color .25s var(--ease),box-shadow .25s var(--ease),border-color .25s var(--ease);
  white-space:nowrap;
}
.btn:active{transform:scale(.97);}
.btn-primary{background:var(--sage-600);color:var(--white);box-shadow:var(--shadow-sm);}
.btn-primary:hover{background:var(--sage-700);box-shadow:var(--shadow-md);}
.btn-ghost{background:transparent;color:var(--ink);border:1.5px solid var(--line);}
.btn-ghost:hover{border-color:var(--sage-600);color:var(--sage-700);}
.on-dark .btn-ghost{color:var(--paper);border-color:var(--line-on-dark);}
.on-dark .btn-ghost:hover{border-color:var(--paper);}
.btn-arrow{transition:transform .3s var(--ease);}
.btn:hover .btn-arrow{transform:translateX(3px);}
.btn-block{width:100%;}

/* ---------- Header ---------- */
.site-header{
  position:fixed;inset-block-start:0;inset-inline:0;z-index:100;
  padding-block:18px;
  transition:background-color .35s var(--ease),box-shadow .35s var(--ease),padding .35s var(--ease),border-color .35s var(--ease);
  border-bottom:1px solid transparent;
}
.site-header .container{display:flex;align-items:center;justify-content:space-between;gap:24px;}
.site-header.is-scrolled{
  background:rgba(246,244,236,0.88);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border-color:var(--line);
  padding-block:12px;
}
.site-header.on-dark-hero:not(.is-scrolled) .header-link{color:var(--white);}
.site-header.on-dark-hero:not(.is-scrolled) .logo-word{color:var(--white);}
.site-header.on-dark-hero:not(.is-scrolled) .btn-ghost{color:var(--white);border-color:rgba(255,255,255,0.4);}

.logo-lockup{display:inline-flex;align-items:center;gap:11px;}
.logo-mark{width:36px;height:36px;flex-shrink:0;}
.logo-word{font-weight:700;font-size:1.2rem;letter-spacing:-0.01em;color:var(--ink);transition:color .3s var(--ease);}

.header-nav{display:none;}
@media (min-width:960px){
  .header-nav{display:flex;align-items:center;gap:2px;}
  .header-nav a{
    padding:10px 16px;border-radius:var(--radius-pill);font-size:.92rem;font-weight:600;
    color:var(--ink-soft);transition:background-color .25s var(--ease),color .25s var(--ease);
  }
  .header-nav a:hover{background:rgba(27,32,22,0.06);color:var(--ink);}
  .site-header.on-dark-hero:not(.is-scrolled) .header-nav a{color:rgba(255,255,255,0.88);}
  .site-header.on-dark-hero:not(.is-scrolled) .header-nav a:hover{background:rgba(255,255,255,0.12);color:#fff;}
  .header-nav a[aria-current="page"]{color:var(--sage-700);}
  .site-header.on-dark-hero:not(.is-scrolled) .header-nav a[aria-current="page"]{color:var(--sage-200);}
}
.header-actions{display:flex;align-items:center;gap:12px;}
.header-actions .btn{padding:12px 22px;font-size:.88rem;}
@media (max-width:640px){.header-actions .btn-ghost-label{display:none;}}

.nav-toggle{
  display:inline-flex;width:44px;height:44px;align-items:center;justify-content:center;
  border-radius:var(--radius-sm);
}
@media (min-width:960px){.nav-toggle{display:none;}}
.nav-toggle svg{width:22px;height:22px;color:var(--ink);}
.site-header.on-dark-hero:not(.is-scrolled) .nav-toggle svg{color:var(--white);}

.mobile-nav{
  position:fixed;inset:0;z-index:99;background:var(--paper);
  display:flex;flex-direction:column;
  padding:96px 28px 40px;
  transform:translateY(-8px);opacity:0;visibility:hidden;
  transition:opacity .3s var(--ease),transform .3s var(--ease),visibility 0s linear .3s;
}
.mobile-nav.is-open{opacity:1;visibility:visible;transform:translateY(0);transition:opacity .3s var(--ease),transform .3s var(--ease);}
.mobile-nav a{display:block;font-size:1.5rem;font-weight:700;padding:14px 0;border-bottom:1px solid var(--line);}
.mobile-nav .btn{margin-top:28px;}

/* ---------- Hero ---------- */
.hero{
  position:relative;min-height:100vh;min-height:100svh;display:flex;align-items:flex-end;
  overflow:hidden;color:var(--white);
}
.hero-media{position:absolute;inset:0;z-index:0;}
.hero-media img{
  width:100%;height:100%;object-fit:cover;object-position:center 62%;
  animation:hero-zoom 22s var(--ease) forwards;
}
@keyframes hero-zoom{from{transform:scale(1.08);}to{transform:scale(1);}}
@media (prefers-reduced-motion: reduce){.hero-media img{animation:none;}}
.hero-scrim{
  position:absolute;inset:0;z-index:1;
  background:
    linear-gradient(180deg, rgba(15,19,11,0.55) 0%, rgba(15,19,11,0.18) 32%, rgba(15,19,11,0.35) 62%, rgba(15,19,11,0.82) 100%);
}
.hero-content{position:relative;z-index:2;width:100%;padding-block:160px 88px;}
.hero-eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--sage-200);margin-bottom:22px;
  opacity:0;animation:rise .8s var(--ease) .15s forwards;
}
.hero-eyebrow::before{content:"";width:22px;height:1px;background:var(--sage-200);}
.hero h1{
  max-width:820px;font-size:clamp(2.6rem,2rem + 3.2vw,5rem);color:var(--white);
  opacity:0;animation:rise .9s var(--ease) .3s forwards;
}
.hero .lede{
  max-width:560px;color:var(--sage-100);margin-top:22px;font-size:clamp(1.05rem,1rem + .3vw,1.2rem);
  opacity:0;animation:rise .9s var(--ease) .48s forwards;
}
.hero-actions{
  display:flex;flex-wrap:wrap;gap:16px;margin-top:38px;
  opacity:0;animation:rise .9s var(--ease) .64s forwards;
}
.hero-stats{
  display:grid;grid-template-columns:repeat(3,auto);gap:clamp(24px,5vw,64px);
  margin-top:clamp(48px,7vw,80px);padding-top:32px;border-top:1px solid rgba(255,255,255,0.22);
  opacity:0;animation:rise .9s var(--ease) .8s forwards;
}
.hero-stat b{display:block;font-size:clamp(1.6rem,1.4rem + .7vw,2.1rem);font-weight:700;letter-spacing:-0.02em;}
.hero-stat span{display:block;font-size:.82rem;color:var(--sage-200);margin-top:4px;}
@keyframes rise{from{opacity:0;transform:translateY(18px);}to{opacity:1;transform:translateY(0);}}

.scroll-cue{
  position:absolute;bottom:28px;left:50%;transform:translateX(-50%);z-index:2;
  display:flex;flex-direction:column;align-items:center;gap:8px;
  color:rgba(255,255,255,0.75);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;
  opacity:0;animation:rise 1s var(--ease) 1.1s forwards;
}
.scroll-cue .line{width:1px;height:34px;background:linear-gradient(180deg,rgba(255,255,255,.8),transparent);animation:cue 2.2s ease-in-out infinite;}
@keyframes cue{0%{transform:scaleY(0);transform-origin:top;}45%{transform:scaleY(1);transform-origin:top;}55%{transform:scaleY(1);transform-origin:bottom;}100%{transform:scaleY(0);transform-origin:bottom;}}
@media (prefers-reduced-motion: reduce){
  .hero-eyebrow,.hero h1,.hero .lede,.hero-actions,.hero-stats,.scroll-cue{animation:none;opacity:1;}
  .scroll-cue .line{animation:none;}
}

/* ---------- Page hero (inner pages) ---------- */
.page-hero{
  background:var(--ink);color:var(--white);
  padding-block:calc(120px + 64px) 72px;
}
.page-hero .eyebrow{color:var(--sage-200);}
.page-hero .eyebrow::before{background:var(--sage-200);}
.page-hero h1{color:var(--white);max-width:820px;}
.page-hero .lede{max-width:640px;color:var(--sage-100);margin-top:18px;}
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:.82rem;color:var(--sage-300);margin-bottom:24px;font-family:var(--font-mono);}
.breadcrumb a{color:var(--sage-200);}
.breadcrumb a:hover{color:var(--white);}
.breadcrumb .sep{opacity:.5;}

/* ---------- Cards & Grids ---------- */
.grid{display:grid;gap:24px;}
.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:900px){.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:var(--white);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:32px;transition:transform .4s var(--ease),box-shadow .4s var(--ease),border-color .4s var(--ease);
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:transparent;}
.card-icon{
  width:52px;height:52px;border-radius:14px;background:var(--sage-100);
  display:flex;align-items:center;justify-content:center;margin-bottom:22px;
  color:var(--sage-700);
}
.card-icon svg{width:26px;height:26px;}
.card h3{margin-bottom:10px;}
.card p{color:var(--ink-soft);font-size:.96rem;}
.card .tag{
  display:inline-block;margin-top:18px;font-family:var(--font-mono);font-size:.72rem;
  letter-spacing:.08em;text-transform:uppercase;color:var(--sage-600);
}

.card-dark{background:var(--sage-800);color:var(--white);border:1px solid var(--sage-700);}
.card-dark p{color:var(--sage-200);}
.card-dark .card-icon{background:rgba(255,255,255,0.1);color:var(--sage-200);}

/* Numbered process */
.step{display:flex;gap:24px;padding-block:32px;border-top:1px solid var(--line);}
.step:last-child{border-bottom:1px solid var(--line);}
.step-index{
  font-family:var(--font-mono);font-size:.95rem;color:var(--sage-600);font-weight:600;
  flex-shrink:0;width:56px;padding-top:4px;
}
.step h3{margin-bottom:8px;}
.step p{color:var(--ink-soft);max-width:60ch;}

/* Stat band */
.stat-band{
  background:var(--sage-800);color:var(--white);border-radius:var(--radius-lg);
  padding:clamp(32px,5vw,56px);display:grid;gap:32px;grid-template-columns:repeat(3,1fr);
}
@media (max-width:760px){.stat-band{grid-template-columns:1fr 1fr;}}
.stat-band b{display:block;font-size:clamp(2rem,1.6rem + 1.5vw,3rem);letter-spacing:-0.02em;}
.stat-band span{display:block;color:var(--sage-200);font-size:.85rem;margin-top:6px;}

/* Sector chips */
.chip-row{display:flex;flex-wrap:wrap;gap:12px;}
.chip{
  padding:10px 18px;border:1px solid var(--line);border-radius:var(--radius-pill);
  font-size:.88rem;font-weight:600;color:var(--ink-soft);display:inline-flex;align-items:center;gap:8px;
}

/* Quote / About */
.about-grid{display:grid;grid-template-columns:0.85fr 1.15fr;gap:clamp(32px,6vw,80px);align-items:center;}
@media (max-width:860px){.about-grid{grid-template-columns:1fr;}}
.about-portrait{position:relative;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-lg);}
.about-portrait img{width:100%;aspect-ratio:4/5;object-fit:cover;}
.about-portrait-badge{
  position:absolute;left:20px;bottom:20px;
  background:rgba(27,32,22,0.72);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  color:var(--white);padding:14px 18px;border-radius:var(--radius-md);
  font-size:.82rem;line-height:1.4;
}
.about-portrait-badge b{display:block;font-size:.95rem;}
.about-signals{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:32px;}
.signal b{display:block;font-size:1.6rem;color:var(--sage-700);}
.signal span{font-size:.85rem;color:var(--ink-faint);}

/* FAQ */
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:24px;
  padding-block:24px;text-align:left;font-weight:600;font-size:1.05rem;
}
.faq-q .plus{
  width:28px;height:28px;flex-shrink:0;border-radius:50%;border:1.5px solid var(--line);
  display:flex;align-items:center;justify-content:center;position:relative;transition:transform .35s var(--ease),border-color .3s var(--ease);
}
.faq-q .plus::before,.faq-q .plus::after{content:"";position:absolute;background:var(--ink);transition:transform .3s var(--ease),opacity .3s var(--ease);}
.faq-q .plus::before{width:10px;height:1.6px;}
.faq-q .plus::after{width:1.6px;height:10px;}
.faq-item[open] .faq-q .plus{transform:rotate(90deg);border-color:var(--sage-600);}
.faq-item[open] .faq-q .plus::after{opacity:0;}
.faq-a{padding-bottom:24px;color:var(--ink-soft);max-width:70ch;}
.faq-item summary{list-style:none;cursor:pointer;}
.faq-item summary::-webkit-details-marker{display:none;}

/* CTA band */
.cta-band{
  position:relative;overflow:hidden;border-radius:var(--radius-lg);
  background:var(--ink);color:var(--white);padding:clamp(48px,7vw,88px);text-align:center;
}
.cta-band::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(560px 280px at 50% 0%, rgba(110,127,94,0.35), transparent 70%);
}
.cta-band > *{position:relative;z-index:1;}
.cta-band h2{color:var(--white);max-width:640px;margin-inline:auto;}
.cta-band .lede{margin-inline:auto;margin-top:14px;}
.cta-band .hero-actions{justify-content:center;margin-top:32px;animation:none;opacity:1;}

/* Form */
.form-grid{display:grid;gap:20px;grid-template-columns:1fr 1fr;}
@media (max-width:640px){.form-grid{grid-template-columns:1fr;}}
.field{display:flex;flex-direction:column;gap:8px;}
.field.full{grid-column:1/-1;}
.field label{font-size:.85rem;font-weight:600;color:var(--ink-soft);}
.field input,.field textarea,.field select{
  padding:14px 16px;border:1.5px solid var(--line);border-radius:var(--radius-sm);
  background:var(--white);transition:border-color .25s var(--ease),box-shadow .25s var(--ease);
}
.field input:focus,.field textarea:focus,.field select:focus{
  border-color:var(--sage-600);box-shadow:0 0 0 4px rgba(110,127,94,0.15);outline:none;
}
.field textarea{resize:vertical;min-height:140px;}
.field-hint{font-size:.78rem;color:var(--ink-faint);}
.consent{display:flex;gap:10px;align-items:flex-start;font-size:.85rem;color:var(--ink-soft);}
.consent input{margin-top:3px;}

/* Contact info list */
.contact-list{display:flex;flex-direction:column;gap:22px;}
.contact-list .item{display:flex;gap:16px;align-items:flex-start;}
.contact-list .ico{
  width:44px;height:44px;border-radius:12px;background:var(--sage-100);color:var(--sage-700);
  display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.contact-list .ico svg{width:20px;height:20px;}
.contact-list a:hover{color:var(--sage-700);}

/* ---------- Footer ---------- */
.site-footer{background:var(--sage-900);color:var(--sage-100);padding-block:72px 32px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;}
@media (max-width:820px){.footer-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:560px){.footer-grid{grid-template-columns:1fr;}}
.footer-grid h4{color:var(--white);font-size:.85rem;letter-spacing:.06em;text-transform:uppercase;margin-bottom:18px;font-weight:700;}
.footer-grid ul{display:flex;flex-direction:column;gap:12px;font-size:.92rem;}
.footer-grid a:hover{color:var(--white);}
.footer-about p{color:var(--sage-300);font-size:.92rem;max-width:34ch;margin-top:16px;}
.footer-bottom{
  margin-top:56px;padding-top:24px;border-top:1px solid var(--line-on-dark);
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;font-size:.82rem;color:var(--sage-400);
}
.footer-bottom ul{display:flex;gap:20px;flex-wrap:wrap;}
.footer-bottom a:hover{color:var(--white);}

/* ---------- Reveal on scroll ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .8s var(--ease),transform .8s var(--ease);}
.reveal.is-visible{opacity:1;transform:translateY(0);}
@media (prefers-reduced-motion: reduce){.reveal{opacity:1;transform:none;transition:none;}}

/* ---------- Utilities ---------- */
.flow > * + *{margin-top:1em;}
.text-center{text-align:center;}
.mt-0{margin-top:0;}
.max-w-prose{max-width:70ch;}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0,0,0,0);white-space:nowrap;border:0;
}
.legal h2{font-size:1.3rem;margin-top:2.4em;margin-bottom:.6em;}
.legal h2:first-child{margin-top:0;}
.legal p,.legal li{color:var(--ink-soft);}
.legal ul{list-style:disc;padding-left:1.4em;}
.legal ul li{margin-top:.4em;}