/* ==========================================================================
   21/90 CONSULTING GROUP — Design system
   Palette : papier chaud + encre presque noire, violet/orange en accents rares.
   Typo : Fraunces (display, serif à forte personnalité) + Inter (texte).
   Signature : la frise temporelle réelle de fondation (2018 -> 2019).
   ========================================================================== */

:root{
  --paper:      #FAF8F4;
  --paper-dim:  #EFEBE1;
  --ink:        #121016;
  --muted:      #4E4957;
  --line:       #DDD6C7;
  --purple:     #452492;
  --purple-dim: #6B4FA8;
  --orange:     #F39723;

  --serif: "Fraunces", "Iowan Old Style", Georgia, serif;
  --sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --section-pad: 9rem;
  --edge: 6vw;
}

@media (max-width: 768px){
  :root{ --section-pad: 4.5rem; --edge: 6.5vw; }
}

*{ box-sizing:border-box; }
html, body{ overflow-x:hidden; max-width:100%; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  background-color:var(--paper);
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='matrix' values='0 0 0 0 0.07 0 0 0 0 0.05 0 0 0 0 0.13 0 0 0 0.035 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat:repeat;
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
::selection{ background:var(--purple); color:var(--paper); }

.wrap{
  max-width:1240px;
  margin:0 auto;
  padding-left:var(--edge);
  padding-right:var(--edge);
}

.eyebrow{
  font-family:var(--sans);
  font-size:.72rem;
  font-weight:600;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--purple);
  display:flex;
  align-items:center;
  gap:.6em;
}
.eyebrow::before{
  content:"";
  width:28px;
  height:1px;
  background:var(--orange);
  display:inline-block;
}

h1,h2,h3{
  font-family:var(--serif);
  font-weight:600;
  line-height:1.08;
  margin:0;
  letter-spacing:-.01em;
}
h2{ font-size:clamp(1.9rem, 3.4vw, 2.7rem); }
p{ margin:0 0 1em; }
.muted{ color:var(--muted); }

/* ---------- Navigation ---------- */
.nav{
  position:sticky; top:0; z-index:50;
  background:rgba(250,248,244,.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
  box-shadow:0 1px 0 rgba(23,21,28,.03), 0 8px 24px -18px rgba(23,21,28,.25);
}
.nav .wrap{
  display:flex; align-items:center; justify-content:space-between;
  height:94px;
}
.nav img{ height:50px; width:auto; }
.nav-links{ display:flex; gap:2.4rem; list-style:none; margin:0; padding:0; }
.nav-links a{
  font-size:.85rem; font-weight:500; letter-spacing:.02em;
  color:var(--ink); position:relative; padding:.3em 0;
}
.nav-links a::after{
  content:""; position:absolute; left:0; right:0; bottom:-2px; height:1px;
  background:var(--purple); transform:scaleX(0); transition:transform .25s ease;
}
.nav-links a:hover::after{ transform:scaleX(1); }
.nav-links a.active{ color:var(--purple); }
.nav-links a.active::after{ transform:scaleX(1); background:var(--purple); }
.nav-cta{
  border:1px solid var(--ink); padding:.55em 1.3em; font-size:.8rem;
  font-weight:600; letter-spacing:.02em; white-space:nowrap;
  border-radius:999px;
}
.nav-cta:hover{ background:var(--ink); color:var(--paper); }
.menu-toggle{ display:none; background:none; border:0; cursor:pointer; padding:.5em; }
.menu-toggle svg{ width:22px; height:22px; }

@media (max-width: 860px){
  .nav-links{
    position:fixed; inset:94px 0 0 0; background:var(--paper);
    flex-direction:column; padding:2.5rem var(--edge); gap:1.6rem;
    transform:translateX(100%); transition:transform .3s ease; z-index:40;
  }
  .nav-links.open{ transform:translateX(0); }
  .nav-links a{ font-size:1.1rem; }
  .menu-toggle{ display:block; }
}

/* ---------- Hero ---------- */
.hero{
  padding:7rem 0 6rem;
  border-bottom:1px solid var(--line);
}
.hero h1{
  font-size:clamp(2.6rem, 5.4vw, 4.2rem);
  max-width:1000px;
  margin:1.1rem 0 1.6rem;
}
.hero h1 em{
  font-style:italic; color:var(--purple);
}
.hero-sub{
  max-width:46ch;
  font-size:1.1rem;
  color:var(--muted);
  margin-bottom:2.4rem;
}
.hero-sub--wide{ max-width:68ch; }
.hero-actions{ display:flex; gap:1rem; flex-wrap:wrap; align-items:center; }

.btn-primary{
  display:inline-block; background:var(--ink); color:var(--paper);
  padding:.95em 1.9em; font-size:.85rem; font-weight:600; letter-spacing:.02em;
  border:1px solid var(--ink); border-radius:999px;
  box-shadow:0 2px 4px rgba(23,21,28,.12), 0 8px 20px -8px rgba(23,21,28,.28);
  transition:.2s ease, transform .2s ease;
}
.btn-primary:hover{
  background:var(--purple); border-color:var(--purple);
  transform:translateY(-2px);
  box-shadow:0 4px 8px rgba(69,36,146,.18), 0 14px 28px -10px rgba(69,36,146,.38);
}
.btn-ghost{
  display:inline-block; padding:.95em 1.9em; font-size:.85rem; font-weight:600;
  border:1px solid var(--line); letter-spacing:.02em; border-radius:999px;
  background:var(--paper);
  transition:.2s ease, transform .2s ease;
}
.btn-ghost:hover{ border-color:var(--ink); transform:translateY(-2px); box-shadow:0 8px 20px -10px rgba(23,21,28,.25); }

.hero-meta{
  margin-top:4.5rem; padding-top:2rem; border-top:1px solid var(--line);
  display:flex; gap:3rem; flex-wrap:wrap;
}
.hero-meta div{ font-size:.8rem; color:var(--muted); }
.hero-meta strong{ display:block; font-family:var(--serif); font-size:1rem; color:var(--ink); font-weight:600; }

/* ---------- Section shell ---------- */
.section{ padding:var(--section-pad) 0; border-bottom:1px solid var(--line); }
.section:last-of-type{ border-bottom:none; }
.section:nth-of-type(even){ background:var(--paper-dim); }
.section-head{ margin-bottom:3.2rem; }
.section-head h2{ margin-top:.6rem; }

/* ---------- Histoire (signature timeline) ---------- */
.history{ display:grid; grid-template-columns:1.1fr 1fr; gap:5vw; align-items:start; }
.timeline-mark{
  font-family:var(--serif); font-weight:600; color:var(--purple);
  font-size:clamp(2.4rem, 5vw, 3.6rem); line-height:1; white-space:nowrap;
}
.timeline-mark span{ color:var(--orange); font-style:italic; font-weight:400; padding:0 .15em; }
.timeline-label{ font-size:.8rem; color:var(--muted); margin-top:.6rem; }
.history p{ font-size:1.05rem; }
@media (max-width: 860px){ .history{ grid-template-columns:1fr; gap:2rem; } }

/* ---------- Mission / Vision ---------- */
.mv-grid{
  display:grid; grid-template-columns:1fr 1fr; gap:0;
  border:1px solid var(--line); border-radius:8px; overflow:hidden;
  background:var(--paper);
  box-shadow:0 1px 2px rgba(23,21,28,.04), 0 12px 32px -18px rgba(23,21,28,.14);
}
.mv-col{ padding:3rem; }
.mv-col + .mv-col{ border-left:1px solid var(--line); }
.mv-col .eyebrow{ margin-bottom:1rem; }
@media (max-width: 860px){
  .mv-grid{ grid-template-columns:1fr; }
  .mv-col + .mv-col{ border-left:none; border-top:1px solid var(--line); }
}

/* ---------- Offre ---------- */
.offer-list{ border-top:1px solid var(--line); }
.offer-item{
  display:grid; grid-template-columns:1fr 2fr; gap:3vw;
  padding:2.8rem 2.6rem; margin:1.6rem 0;
  align-items:baseline;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:6px;
  box-shadow:0 1px 2px rgba(23,21,28,.04), 0 8px 24px -12px rgba(23,21,28,.10);
}
.offer-list .offer-item:first-child{ margin-top:0; }
.offer-item h3{ font-size:1.5rem; display:flex; align-items:center; gap:.7rem; }
.offer-tags-line{
  margin-top:1.1rem; font-size:.85rem; color:var(--muted);
  letter-spacing:.01em;
}

/* Icônes d'expertise */
.offer-head{ display:flex; align-items:flex-start; gap:1.3rem; }
.offer-icon{
  flex:none; width:46px; height:46px; color:var(--purple);
  display:flex; align-items:center; justify-content:center;
  background:var(--paper-dim);
  border-radius:50%;
  padding:11px;
  box-shadow:inset 0 0 0 1px var(--line), 0 2px 6px rgba(23,21,28,.08);
}
.offer-icon svg{ width:100%; height:100%; display:block; }
.offer-icon--sm{
  width:26px; height:26px; padding:0; background:transparent;
  box-shadow:none; border-radius:0;
}

.pillar-card{
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:8px;
  padding:3rem;
  box-shadow:0 1px 2px rgba(23,21,28,.04), 0 12px 32px -16px rgba(23,21,28,.14);
}
@media (max-width: 860px){
  .offer-item{ grid-template-columns:1fr; gap:1rem; }
  .pillar-card{ padding:2rem; }
}

/* ---------- Contact ---------- */
.contact-grid{ display:grid; grid-template-columns:1fr 1fr; gap:5vw; }
.contact-info dt{ font-size:.75rem; letter-spacing:.08em; text-transform:uppercase; color:var(--muted); margin-top:2rem; }
.contact-info dt:first-child{ margin-top:0; }
.contact-info dd{ margin:.3em 0 0; font-family:var(--serif); font-size:1.2rem; }
.contact-info a:hover{ color:var(--purple); }

form.contact-form{
  display:flex; flex-direction:column; gap:1.1rem;
  background:var(--paper); border:1px solid var(--line); border-radius:8px;
  padding:2.6rem;
  box-shadow:0 1px 2px rgba(23,21,28,.04), 0 12px 32px -18px rgba(23,21,28,.14);
}
.form-row{ display:grid; grid-template-columns:1fr 1fr; gap:1.1rem; }
.contact-form label{ font-size:.75rem; letter-spacing:.06em; text-transform:uppercase; color:var(--muted); display:block; margin-bottom:.4em; }
.contact-form input, .contact-form textarea{
  width:100%; border:none; border-bottom:1px solid var(--line); background:transparent;
  padding:.6em 0; font-family:var(--sans); font-size:1rem; color:var(--ink);
}
.contact-form input:focus, .contact-form textarea:focus{
  outline:none; border-color:var(--purple);
}
.contact-form button{
  align-self:flex-start; margin-top:.8rem; cursor:pointer;
  font-family:var(--sans);
}
@media (max-width: 860px){ .contact-grid, .form-row{ grid-template-columns:1fr; } }

/* ---------- CTA band ---------- */
.cta-band{
  background:
    radial-gradient(120% 180% at 15% 0%, rgba(107,79,168,.35) 0%, rgba(18,16,22,0) 55%),
    linear-gradient(160deg, #1D1926 0%, #121016 65%);
  color:var(--paper); padding:5.5rem 0; text-align:center;
  position:relative;
}
.cta-band h2{ color:var(--paper); margin-bottom:1.6rem; }
.cta-band p{ color:rgba(250,248,244,.72); }
.cta-band .btn-primary{
  background:var(--paper); color:var(--ink); border-color:var(--paper);
  box-shadow:0 2px 4px rgba(0,0,0,.2), 0 10px 24px -10px rgba(0,0,0,.4);
}
.cta-band .btn-primary:hover{ background:var(--orange); border-color:var(--orange); color:var(--ink); }

/* ---------- Footer ---------- */
footer{ padding:3.5rem 0 2.5rem; }
.footer-grid{ display:flex; justify-content:space-between; flex-wrap:wrap; gap:2rem; margin-bottom:2.5rem; }
.footer-col h4{ font-size:.75rem; letter-spacing:.08em; text-transform:uppercase; color:var(--muted); margin-bottom:.9rem; font-weight:600; }
.footer-col a, .footer-col p{ font-size:.9rem; color:var(--ink); margin:.4em 0; }
.footer-col a:hover{ color:var(--purple); }
.footer-bottom{
  border-top:1px solid var(--line); padding-top:1.5rem;
  display:flex; justify-content:space-between; flex-wrap:wrap; gap:1rem;
  font-size:.78rem; color:var(--muted);
}

/* ---------- Apparition au chargement (fiable, sans dépendance JS) ---------- */
.reveal{
  animation: settle .7s ease both;
}
@keyframes settle{
  from{ opacity:0; transform:translateY(16px); }
  to{ opacity:1; transform:translateY(0); }
}
@media (prefers-reduced-motion: reduce){
  .reveal{ animation:none; opacity:1; transform:none; }
}

.inline-icon-link{ display:inline-flex; align-items:center; gap:.5em; }
.inline-icon-link .offer-icon{ color:inherit; }

.nav img, .footer-col img{
  filter:drop-shadow(0 2px 4px rgba(23,21,28,.10)) drop-shadow(0 8px 16px rgba(23,21,28,.10));
}

/* ---------- Bande image ---------- */
.image-band{ position:relative; line-height:0; padding:2.5rem 0; }
.image-band img{
  width:100%; height:min(28vw, 460px); object-fit:cover; display:block;
  filter:saturate(.96) contrast(1.03);
  border-radius:14px;
}
@media (max-width: 768px){
  .image-band{ padding:1.5rem 0; }
  .image-band img{ height:56vw; border-radius:10px; }
}

/* ---------- Publications (cartes inspirées de BCG) ---------- */
.pub-grid{
  display:grid; grid-template-columns:repeat(auto-fit, minmax(280px, 1fr));
  gap:1.8rem;
}
.pub-card{
  background:var(--paper); border:1px solid var(--line); border-radius:10px;
  overflow:hidden;
  box-shadow:0 1px 2px rgba(23,21,28,.04), 0 12px 28px -16px rgba(23,21,28,.16);
  display:flex; flex-direction:column;
}
.pub-card-top{
  height:130px; position:relative; display:flex; align-items:center; justify-content:center;
  background:var(--paper-dim); border-bottom:1px solid var(--line);
}
.pub-icon{ width:44px; height:44px; color:var(--purple); }
.pub-icon svg{ width:100%; height:100%; }
.pub-tag{
  position:absolute; left:1rem; bottom:1rem;
  background:rgba(250,248,244,.92); color:var(--ink);
  font-size:.68rem; font-weight:600; letter-spacing:.03em; text-transform:uppercase;
  padding:.4em .9em; border-radius:999px; border:1px solid var(--line);
}
.pub-card-body{ padding:1.6rem; display:flex; flex-direction:column; gap:.8rem; flex:1; }
.pub-card-body h3{
  font-family:var(--serif); font-weight:600; font-size:1.15rem; line-height:1.25; margin:0;
}
.pub-card-body p{ font-size:.9rem; color:var(--muted); margin:0; flex:1; }
.pub-download{
  display:inline-flex; align-items:center; gap:.6em; font-size:.82rem; font-weight:600;
  margin-top:.4rem; align-self:flex-start;
}
.arrow-btn{
  display:inline-flex; align-items:center; justify-content:center;
  width:28px; height:28px; border-radius:50%; border:1px solid var(--ink);
  transition:.2s ease;
}
.pub-download:hover .arrow-btn{ background:var(--purple); border-color:var(--purple); color:#fff; }

/* ---------- Utility ---------- */
.visually-hidden{ position:absolute; width:1px;height:1px; overflow:hidden; clip:rect(0 0 0 0); }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
  outline:2px solid var(--purple); outline-offset:2px;
}
@media (prefers-reduced-motion: reduce){
  *{ animation:none !important; transition:none !important; scroll-behavior:auto !important; }
}