/* ===========================================================
   Sylven — AI Consulting
   Organic-tech : chêne, réseaux neuronaux, lumière ambrée
   =========================================================== */

:root{
  --bark:#2c2419;        /* écorce de chêne sombre */
  --bark-2:#3a3022;
  --oak:#6b5638;         /* bois de chêne */
  --sap:#8a9a5b;         /* feuillage / sève */
  --amber:#c98a3b;       /* lumière ambrée */
  --amber-soft:#e0b878;
  --cream:#f4efe4;       /* lin clair */
  --cream-2:#ece4d3;
  --ink:#241d13;
  --muted:#6f6650;
  --line:rgba(44,36,25,.14);
  --shadow:0 18px 50px -22px rgba(44,36,25,.45);
  --radius:18px;
  --maxw:1180px;
  --serif:"Fraunces","Georgia",serif;
  --sans:"Outfit","Segoe UI",system-ui,sans-serif;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--sans);
  color:var(--ink);
  background:var(--cream);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--oak);text-decoration:none}
a:hover{color:var(--amber)}
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;line-height:1.12;color:var(--bark);letter-spacing:-.01em}
.container{max-width:var(--maxw);margin:0 auto;padding:0 clamp(20px,5vw,40px)}
.eyebrow{
  font-family:var(--sans);text-transform:uppercase;letter-spacing:.22em;
  font-size:.72rem;font-weight:600;color:var(--amber);margin:0 0 14px
}
.section{padding:clamp(64px,9vw,118px) 0}
.section--tint{background:linear-gradient(180deg,var(--cream) 0%,var(--cream-2) 100%)}
.lead{font-size:clamp(1.02rem,1.6vw,1.18rem);color:var(--muted);max-width:62ch}

/* buttons */
.btn{
  display:inline-flex;align-items:center;gap:.55em;cursor:pointer;
  font-family:var(--sans);font-weight:600;font-size:.95rem;
  padding:.85em 1.55em;border-radius:999px;border:1.5px solid transparent;
  transition:transform .2s ease,box-shadow .2s ease,background .2s ease,color .2s;
}
.btn--primary{background:var(--amber);color:#2a2110;box-shadow:0 12px 28px -12px rgba(201,138,59,.7)}
.btn--primary:hover{transform:translateY(-2px);background:var(--amber-soft);color:#2a2110}
.btn--ghost{border-color:var(--line);color:var(--bark);background:transparent}
.btn--ghost:hover{border-color:var(--oak);color:var(--oak);transform:translateY(-2px)}
.btn--block{width:100%;justify-content:center}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(244,239,228,.82);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{display:flex;align-items:center;gap:.6em;font-family:var(--serif);font-size:1.35rem;font-weight:600;color:var(--bark)}
.brand svg{width:34px;height:34px}
.brand span{color:var(--amber)}
.nav-links{display:flex;align-items:center;gap:28px;list-style:none;margin:0;padding:0}
.nav-links a{font-size:.94rem;font-weight:500;color:var(--bark)}
.nav-links a:hover{color:var(--amber)}
.nav-cta{margin-left:8px}
.burger{display:none;background:none;border:0;cursor:pointer;width:42px;height:42px;color:var(--bark)}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;background:var(--bark)}
.hero::before{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(900px 420px at 78% 12%,rgba(201,138,59,.32),transparent 60%),
    radial-gradient(700px 500px at 10% 90%,rgba(138,154,91,.22),transparent 60%);
  pointer-events:none;
}
.hero-grid{
  display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(32px,5vw,64px);
  align-items:center;padding:clamp(72px,10vw,120px) 0;position:relative;z-index:2
}
.hero h1{color:var(--cream);font-size:clamp(2.4rem,5.4vw,4rem);margin:0 0 22px}
.hero h1 em{font-style:italic;color:var(--amber-soft)}
.hero p{color:rgba(244,239,228,.82);font-size:clamp(1.05rem,1.7vw,1.22rem);max-width:52ch;margin:0 0 32px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{display:flex;gap:34px;margin-top:46px;flex-wrap:wrap}
.hero-stats .num{font-family:var(--serif);font-size:1.9rem;color:var(--amber-soft);display:block;line-height:1}
.hero-stats .lbl{font-size:.82rem;color:rgba(244,239,228,.7);text-transform:uppercase;letter-spacing:.12em}
.hero-visual{position:relative}
.hero-visual img{
  border-radius:var(--radius);box-shadow:var(--shadow);
  width:100%;height:clamp(340px,46vw,520px);object-fit:cover;
  border:1px solid rgba(244,239,228,.12)
}
.hero-badge{
  position:absolute;left:-14px;bottom:24px;background:var(--cream);
  border-radius:14px;padding:14px 18px;box-shadow:var(--shadow);max-width:230px;
  display:flex;gap:12px;align-items:center
}
.hero-badge .dot{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--sap),var(--amber));flex:0 0 auto}
.hero-badge small{display:block;font-size:.74rem;color:var(--muted)}
.hero-badge strong{font-family:var(--serif);font-size:1rem;color:var(--bark)}

/* ---------- logos / trust strip ---------- */
.trust{border-bottom:1px solid var(--line);background:var(--cream)}
.trust .container{display:flex;align-items:center;gap:28px;flex-wrap:wrap;justify-content:center;padding-top:26px;padding-bottom:26px}
.trust p{margin:0;color:var(--muted);font-size:.82rem;text-transform:uppercase;letter-spacing:.14em}
.trust ul{display:flex;gap:30px;list-style:none;margin:0;padding:0;flex-wrap:wrap;font-family:var(--serif);color:var(--oak);font-size:1.05rem}

/* ---------- section heading ---------- */
.sec-head{max-width:60ch;margin-bottom:52px}
.sec-head h2{font-size:clamp(1.9rem,3.6vw,2.7rem);margin:0 0 16px}

/* ---------- services ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{
  background:var(--cream);border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 28px;transition:transform .25s ease,box-shadow .25s ease,border-color .25s;
  position:relative;overflow:hidden
}
.card::after{content:"";position:absolute;left:0;top:0;height:3px;width:0;background:linear-gradient(90deg,var(--sap),var(--amber));transition:width .35s ease}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:transparent}
.card:hover::after{width:100%}
.card .ico{width:50px;height:50px;border-radius:12px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(138,154,91,.18),rgba(201,138,59,.2));margin-bottom:18px;color:var(--oak)}
.card h3{font-size:1.22rem;margin:0 0 10px}
.card p{margin:0;color:var(--muted);font-size:.96rem}

/* ---------- approach / process ---------- */
.process{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;counter-reset:step}
.step{position:relative;padding-top:28px}
.step::before{
  counter-increment:step;content:"0" counter(step);
  font-family:var(--serif);font-size:2.1rem;color:var(--amber);opacity:.85;display:block;margin-bottom:8px
}
.step h3{font-size:1.12rem;margin:0 0 8px}
.step p{margin:0;color:var(--muted);font-size:.93rem}
.step::after{content:"";position:absolute;top:46px;right:-11px;width:22px;height:2px;background:var(--line)}
.step:last-child::after{display:none}

/* ---------- split / about ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,5vw,60px);align-items:center}
.split img{border-radius:var(--radius);box-shadow:var(--shadow);height:clamp(320px,40vw,470px);object-fit:cover;width:100%}
.split ul{list-style:none;padding:0;margin:24px 0 0;display:grid;gap:14px}
.split li{display:flex;gap:12px;align-items:flex-start;color:var(--ink)}
.split li svg{flex:0 0 auto;margin-top:3px;color:var(--sap)}

/* ---------- pricing ---------- */
.pricing{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:stretch}
.plan{
  background:var(--cream);border:1px solid var(--line);border-radius:var(--radius);
  padding:34px 30px;display:flex;flex-direction:column;transition:transform .25s,box-shadow .25s
}
.plan:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.plan--featured{background:var(--bark);border-color:var(--bark);color:var(--cream)}
.plan--featured h3,.plan--featured .price{color:var(--cream)}
.plan--featured .price small{color:rgba(244,239,228,.7)}
.plan--featured .feat li{color:rgba(244,239,228,.85)}
.plan--featured .feat svg{color:var(--amber-soft)}
.plan .tag{font-size:.74rem;text-transform:uppercase;letter-spacing:.16em;font-weight:700;color:var(--amber);margin-bottom:10px}
.plan--featured .tag{color:var(--amber-soft)}
.plan h3{font-size:1.4rem;margin:0 0 6px}
.plan .price{font-family:var(--serif);font-size:2.5rem;color:var(--bark);line-height:1;margin:8px 0 4px}
.plan .price small{font-family:var(--sans);font-size:.92rem;color:var(--muted);font-weight:500}
.plan .desc{font-size:.92rem;color:var(--muted);margin:0 0 22px;min-height:42px}
.plan--featured .desc{color:rgba(244,239,228,.75)}
.feat{list-style:none;padding:0;margin:0 0 26px;display:grid;gap:12px;flex:1}
.feat li{display:flex;gap:10px;align-items:flex-start;font-size:.94rem}
.feat svg{flex:0 0 auto;margin-top:3px;color:var(--sap)}
.price-note{text-align:center;margin-top:30px;color:var(--muted);font-size:.9rem}

/* ---------- testimonials ---------- */
.quotes{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.quote{background:var(--cream);border:1px solid var(--line);border-radius:var(--radius);padding:30px}
.quote p{font-family:var(--serif);font-size:1.12rem;color:var(--bark);font-style:italic;margin:0 0 18px}
.quote .who{display:flex;align-items:center;gap:12px}
.quote .av{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--sap),var(--amber));flex:0 0 auto}
.quote .who strong{display:block;font-size:.94rem;color:var(--bark)}
.quote .who small{color:var(--muted);font-size:.82rem}

/* ---------- FAQ ---------- */
.faq{max-width:820px;margin:0 auto}
.faq details{border:1px solid var(--line);border-radius:14px;padding:0;margin-bottom:14px;background:var(--cream);overflow:hidden}
.faq summary{cursor:pointer;list-style:none;padding:20px 24px;font-family:var(--serif);font-size:1.08rem;color:var(--bark);display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.5rem;color:var(--amber);transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq .ans{padding:0 24px 22px;color:var(--muted);font-size:.96rem}

/* ---------- contact ---------- */
.contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(32px,5vw,56px)}
.contact-info ul{list-style:none;padding:0;margin:26px 0 0;display:grid;gap:20px}
.contact-info li{display:flex;gap:14px;align-items:flex-start}
.contact-info .ci-ico{width:44px;height:44px;border-radius:12px;background:linear-gradient(135deg,rgba(138,154,91,.18),rgba(201,138,59,.2));display:grid;place-items:center;color:var(--oak);flex:0 0 auto}
.contact-info small{display:block;color:var(--muted);font-size:.8rem;text-transform:uppercase;letter-spacing:.1em}
.contact-info strong{font-weight:600;color:var(--bark)}
.form{background:var(--cream);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(26px,4vw,38px);box-shadow:var(--shadow)}
.field{margin-bottom:18px}
.field label{display:block;font-size:.88rem;font-weight:600;color:var(--bark);margin-bottom:7px}
.field input,.field select,.field textarea{
  width:100%;padding:.85em 1em;border:1.5px solid var(--line);border-radius:11px;
  font-family:var(--sans);font-size:.96rem;background:#fff;color:var(--ink);transition:border-color .2s,box-shadow .2s
}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--amber);box-shadow:0 0 0 3px rgba(201,138,59,.18)}
.field textarea{resize:vertical;min-height:120px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.check{display:flex;gap:10px;align-items:flex-start;font-size:.86rem;color:var(--muted)}
.check input{width:auto;margin-top:3px}
.form-msg{margin-top:14px;font-size:.92rem;padding:12px 16px;border-radius:10px;display:none}
.form-msg.ok{display:block;background:rgba(138,154,91,.16);color:#48562c}
.form-msg.err{display:block;background:rgba(201,80,59,.14);color:#9a3a26}

/* ---------- footer ---------- */
.site-footer{background:var(--bark);color:rgba(244,239,228,.78);padding:64px 0 28px}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:40px;margin-bottom:44px}
.site-footer .brand{color:var(--cream);margin-bottom:16px}
.site-footer p{font-size:.92rem;max-width:38ch}
.foot-col h4{color:var(--cream);font-size:1rem;margin:0 0 16px}
.foot-col ul{list-style:none;padding:0;margin:0;display:grid;gap:10px}
.foot-col a{color:rgba(244,239,228,.74);font-size:.92rem}
.foot-col a:hover{color:var(--amber-soft)}
.foot-bottom{border-top:1px solid rgba(244,239,228,.12);padding-top:24px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:.84rem;color:rgba(244,239,228,.6)}

/* ---------- cookie banner ---------- */
.cookie{
  position:fixed;left:18px;right:18px;bottom:18px;z-index:80;max-width:560px;margin:0 auto;
  background:var(--bark-2);color:var(--cream);border:1px solid rgba(244,239,228,.14);
  border-radius:16px;padding:20px 22px;box-shadow:0 20px 60px -20px rgba(0,0,0,.6);
  display:none
}
.cookie.show{display:block;animation:rise .4s ease}
@keyframes rise{from{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}
.cookie h4{color:var(--cream);font-size:1.05rem;margin:0 0 8px}
.cookie p{font-size:.88rem;color:rgba(244,239,228,.8);margin:0 0 16px}
.cookie p a{color:var(--amber-soft);text-decoration:underline}
.cookie-actions{display:flex;gap:10px;flex-wrap:wrap}
.cookie .btn{padding:.7em 1.3em;font-size:.88rem}
.cookie .btn--ghost{color:var(--cream);border-color:rgba(244,239,228,.3)}
.cookie .btn--ghost:hover{border-color:var(--amber-soft);color:var(--amber-soft)}

/* ---------- legal pages ---------- */
.legal{padding:clamp(48px,7vw,90px) 0}
.legal .container{max-width:820px}
.legal h1{font-size:clamp(2rem,4vw,2.8rem);margin:0 0 10px}
.legal .updated{color:var(--muted);font-size:.88rem;margin-bottom:36px}
.legal h2{font-size:1.4rem;margin:38px 0 12px}
.legal h3{font-size:1.1rem;margin:24px 0 8px}
.legal p,.legal li{color:#3d3526;font-size:.98rem}
.legal ul{padding-left:20px}
.legal a{color:var(--oak);text-decoration:underline}
.legal .back{display:inline-flex;align-items:center;gap:6px;margin-bottom:30px;font-weight:600;color:var(--amber)}

/* ---------- reveal animation ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr;text-align:left}
  .hero-visual{order:-1}
  .cards,.pricing,.quotes{grid-template-columns:1fr 1fr}
  .process{grid-template-columns:1fr 1fr}
  .step::after{display:none}
  .split{grid-template-columns:1fr}
  .split img{order:-1}
  .contact-grid{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  .nav-links{
    position:absolute;top:74px;left:0;right:0;background:var(--cream);
    flex-direction:column;align-items:stretch;gap:0;padding:8px 0;
    border-bottom:1px solid var(--line);box-shadow:var(--shadow);display:none
  }
  .nav-links.open{display:flex}
  .nav-links li{padding:0 24px}
  .nav-links a{display:block;padding:12px 0;border-bottom:1px solid var(--line)}
  .nav-cta{margin:12px 24px}
  .burger{display:grid;place-items:center}
  .cards,.pricing,.quotes,.process,.form-row,.foot-grid{grid-template-columns:1fr}
  .hero-stats{gap:24px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}