/* ===================================================================
   ASCENSION ESCALIERS — escalier.click
   Design concept: "Obsidienne & Magma"
   Violet-black obsidian base (Auvergne volcanic stone) + vermillion
   magma accent. Fonts: Antonio (headlines) / Titillium Web (body) /
   Overpass Mono (technical labels, counters, legal IDs).
   =================================================================== */

:root{
  --bg-1:#171420;
  --bg-2:#1e1a2b;
  --bg-3:#272134;
  --bg-4:#332c42;
  --bg-5:#3f3752;
  --ink:#f1ede8;
  --ink-dim:#bcb4c9;
  --ink-faint:#8b8398;
  --magma:#e4491f;
  --magma-hover:#ff6234;
  --magma-dark:#a8330f;
  --magma-pale:#ffcbb0;
  --ember:#c97b2e;
  --steel:#9aa4ad;
  --steel-dark:#5f6a73;
  --line:#3a3348;
  --font-head:'Antonio',sans-serif;
  --font-body:'Titillium Web',sans-serif;
  --font-mono:'Overpass Mono',monospace;
  --radius:6px;
  --shadow:0 20px 50px -20px rgba(0,0,0,.55);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg-1);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.62;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{list-style:none;margin:0;padding:0;}
h1,h2,h3,h4{
  font-family:var(--font-head);
  font-weight:600;
  letter-spacing:.01em;
  margin:0 0 .5em;
  text-transform:uppercase;
  color:var(--ink);
}
h1{font-size:clamp(2.4rem,5.4vw,4.6rem);line-height:1.03;font-weight:700;}
h2{font-size:clamp(1.9rem,3.6vw,2.9rem);line-height:1.08;}
h3{font-size:1.3rem;letter-spacing:.02em;}
p{margin:0 0 1em;color:var(--ink-dim);}
.container{max-width:1240px;margin:0 auto;padding:0 28px;}
.eyebrow{
  font-family:var(--font-mono);
  color:var(--magma);
  text-transform:uppercase;
  letter-spacing:.16em;
  font-size:.78rem;
  display:inline-flex;
  align-items:center;
  gap:.6em;
  margin-bottom:1.1em;
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--magma);display:inline-block;}
.section{padding:96px 0;position:relative;}
.section-alt{background:var(--bg-2);}
.section-head{max-width:640px;margin-bottom:56px;}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center;}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.6em;
  font-family:var(--font-body);font-weight:600;font-size:.95rem;
  letter-spacing:.02em;text-transform:uppercase;
  padding:15px 30px;border-radius:3px;border:1px solid transparent;
  cursor:pointer;transition:all .22s ease;white-space:nowrap;
}
.btn-primary{background:var(--magma);color:#fff8f4;}
.btn-primary:hover{background:var(--magma-hover);transform:translateY(-2px);}
.btn-ghost{background:transparent;border-color:var(--steel-dark);color:var(--ink);}
.btn-ghost:hover{border-color:var(--steel);background:rgba(154,164,173,.08);}
.btn-sm{padding:10px 20px;font-size:.82rem;}

/* ---------- Cookie banner ---------- */
#cookie-banner{
  position:fixed;left:0;right:0;bottom:0;z-index:900;
  background:var(--bg-4);border-top:1px solid var(--line);
  padding:20px 28px;display:none;
  box-shadow:0 -10px 40px rgba(0,0,0,.4);
}
#cookie-banner.show{display:block;}
.cookie-inner{
  max-width:1240px;margin:0 auto;display:flex;flex-wrap:wrap;
  align-items:center;justify-content:space-between;gap:18px;
}
.cookie-text{flex:1 1 460px;font-size:.92rem;color:var(--ink-dim);margin:0;}
.cookie-text a{color:var(--magma-pale);text-decoration:underline;}
.cookie-actions{display:flex;gap:12px;flex:0 0 auto;}

/* ---------- Header / nav ---------- */
header{
  position:fixed;top:0;left:0;right:0;z-index:800;
  background:rgba(23,20,32,.86);backdrop-filter:blur(10px);
  border-bottom:1px solid rgba(255,255,255,.06);
}
.nav-row{display:flex;align-items:center;justify-content:space-between;height:82px;}
.logo{display:flex;align-items:center;gap:10px;font-family:var(--font-head);font-size:1.5rem;letter-spacing:.03em;text-transform:uppercase;}
.logo-mark{width:34px;height:34px;flex:0 0 auto;}
.logo small{display:block;font-family:var(--font-mono);font-size:.56rem;letter-spacing:.14em;color:var(--ink-faint);text-transform:uppercase;margin-top:1px;}
nav.main-nav{display:flex;align-items:center;gap:34px;}
nav.main-nav a{font-size:.92rem;font-weight:600;letter-spacing:.02em;color:var(--ink-dim);transition:color .2s;}
nav.main-nav a:hover{color:var(--magma-pale);}
.nav-right{display:flex;align-items:center;gap:22px;}
.nav-phone{display:flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:.88rem;color:var(--ink);}
.nav-phone svg{width:15px;height:15px;stroke:var(--magma);}
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px;}
.hamburger span{width:24px;height:2px;background:var(--ink);display:block;}

/* ---------- Hero ---------- */
.hero{
  position:relative;min-height:100vh;display:flex;align-items:center;
  padding-top:82px;overflow:hidden;background:var(--bg-1);
}
.hero-bg{position:absolute;inset:0;z-index:0;}
.hero-bg img{width:100%;height:100%;object-fit:cover;}
.hero-bg::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(23,20,32,.97) 0%,rgba(23,20,32,.86) 32%,rgba(23,20,32,.45) 58%,rgba(23,20,32,.72) 100%);
}
.hero-grid{position:relative;z-index:2;display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;width:100%;}
.hero-copy{max-width:600px;}
.hero-copy p{font-size:1.14rem;max-width:480px;}
.hero-ctas{display:flex;gap:16px;margin-top:34px;flex-wrap:wrap;}
.hero-badges{display:flex;gap:28px;margin-top:52px;flex-wrap:wrap;}
.hero-badge{font-family:var(--font-mono);font-size:.78rem;color:var(--ink-faint);}
.hero-badge b{display:block;font-family:var(--font-head);font-size:1.5rem;color:var(--ink);text-transform:none;}

/* --- spiral / "La Coulee Ascendante" hero mechanic --- */
.helix-wrap{position:relative;display:flex;justify-content:center;align-items:center;z-index:2;}
.helix-svg{width:min(360px,88%);height:auto;filter:drop-shadow(0 0 22px rgba(228,73,31,.22));}
.helix-track{fill:none;stroke:var(--bg-5);stroke-width:2;stroke-linecap:round;}
.helix-glow{
  fill:none;stroke:url(#magmaGrad);stroke-width:3.4;stroke-linecap:round;
  stroke-dasharray:170 900;stroke-dashoffset:0;
  animation:climb 6s linear infinite;
}
@keyframes climb{
  0%{stroke-dashoffset:1070;}
  100%{stroke-dashoffset:0;}
}
.tick{fill:var(--bg-5);transition:fill .3s;}
.tick.lit{fill:var(--magma);}
.helix-readout{
  position:absolute;bottom:-6px;left:50%;transform:translateX(-50%);
  background:var(--bg-2);border:1px solid var(--line);border-radius:20px;
  padding:8px 18px;font-family:var(--font-mono);font-size:.78rem;
  color:var(--ink-dim);letter-spacing:.05em;white-space:nowrap;
  box-shadow:var(--shadow);
}
.helix-readout b{color:var(--magma-pale);font-weight:600;}

/* ---------- Stats strip ---------- */
.stats{background:var(--bg-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0;}
.stat{padding:44px 20px;text-align:center;border-left:1px solid var(--line);}
.stat:first-child{border-left:none;}
.stat b{display:block;font-family:var(--font-head);font-size:2.5rem;color:var(--magma-pale);letter-spacing:.01em;}
.stat span{font-family:var(--font-mono);font-size:.76rem;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-faint);}

/* ---------- Services ---------- */
.services-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;}
.service-card{
  background:var(--bg-3);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;transition:transform .25s ease,border-color .25s ease;
}
.service-card:hover{transform:translateY(-5px);border-color:var(--magma-dark);}
.service-card .thumb{aspect-ratio:4/3;overflow:hidden;}
.service-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease;}
.service-card:hover .thumb img{transform:scale(1.06);}
.service-body{padding:26px 26px 30px;}
.service-num{font-family:var(--font-mono);color:var(--magma);font-size:.8rem;letter-spacing:.08em;}
.service-body h3{margin-top:.3em;}
.service-body p{font-size:.94rem;margin-bottom:0;}
.service-wide{grid-column:span 3;display:grid;grid-template-columns:1fr 1fr;gap:0;}
.service-wide .thumb{aspect-ratio:auto;}

/* ---------- Why us ---------- */
.why-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:60px;align-items:center;}
.why-photo{position:relative;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);}
.why-photo img{width:100%;}
.why-photo-tag{
  position:absolute;bottom:16px;left:16px;background:rgba(23,20,32,.82);
  border:1px solid var(--line);padding:10px 16px;border-radius:4px;
  font-family:var(--font-mono);font-size:.74rem;color:var(--ink-dim);
}
.why-list{display:flex;flex-direction:column;gap:26px;margin-top:30px;}
.why-item{display:flex;gap:18px;}
.why-icon{
  flex:0 0 auto;width:46px;height:46px;border-radius:50%;
  background:var(--bg-3);border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;
}
.why-icon svg{width:20px;height:20px;stroke:var(--magma);}
.why-item h4{margin:0 0 .3em;font-family:var(--font-body);text-transform:none;font-size:1.06rem;font-weight:700;color:var(--ink);}
.why-item p{margin:0;font-size:.93rem;}

/* ---------- Process ---------- */
.process-row{display:grid;grid-template-columns:repeat(5,1fr);gap:22px;}
.process-step{position:relative;padding:34px 22px 24px;background:var(--bg-3);border:1px solid var(--line);border-radius:var(--radius);}
.process-step b{
  display:inline-flex;align-items:center;justify-content:center;
  width:38px;height:38px;border-radius:50%;background:var(--magma);
  color:#fff8f4;font-family:var(--font-mono);font-size:.95rem;margin-bottom:16px;
}
.process-step h4{font-family:var(--font-body);text-transform:none;font-size:1.02rem;font-weight:700;margin:0 0 .4em;color:var(--ink);}
.process-step p{font-size:.87rem;margin:0;}
.process-row .process-step:not(:last-child)::after{
  content:"";position:absolute;top:52px;right:-22px;width:22px;height:1px;
  background:var(--line);display:block;
}

/* ---------- Gallery — "Le Noyau" mechanic ---------- */
.gallery-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.gallery-tile{
  position:relative;aspect-ratio:1/1;border-radius:var(--radius);overflow:hidden;
  cursor:pointer;background:var(--bg-3);
}
.gallery-tile img{width:100%;height:100%;object-fit:cover;filter:saturate(.94) contrast(1.02);}
.noyau-mask{
  position:absolute;inset:0;
  background:
    repeating-conic-gradient(from 0deg,var(--bg-1) 0deg 7deg,transparent 7deg 15deg),
    radial-gradient(circle at center,var(--magma) 0 2.4%,transparent 3%);
  transition:transform 1.05s cubic-bezier(.5,0,.15,1),opacity 1.05s ease;
  transform-origin:center;
}
.gallery-tile:hover .noyau-mask{transform:rotate(230deg) scale(1.7);opacity:0;}
.gallery-cap{
  position:absolute;left:0;right:0;bottom:0;padding:20px;
  background:linear-gradient(0deg,rgba(23,20,32,.92),transparent);
  transform:translateY(100%);transition:transform .5s ease .1s;
}
.gallery-tile:hover .gallery-cap{transform:translateY(0);}
.gallery-cap b{display:block;font-family:var(--font-head);font-size:1.05rem;text-transform:uppercase;color:var(--ink);}
.gallery-cap span{font-family:var(--font-mono);font-size:.72rem;color:var(--magma-pale);letter-spacing:.04em;}

/* ---------- Testimonials ---------- */
.testi-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;}
.testi-card{background:var(--bg-3);border:1px solid var(--line);border-radius:var(--radius);padding:32px;}
.stars{color:var(--ember);font-size:.95rem;letter-spacing:.15em;margin-bottom:16px;}
.testi-card p{font-size:.96rem;color:var(--ink-dim);font-style:italic;}
.testi-who{display:flex;align-items:center;gap:12px;margin-top:18px;}
.testi-avatar{
  width:42px;height:42px;border-radius:50%;background:var(--bg-4);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-head);color:var(--magma-pale);font-size:1rem;
}
.testi-who b{display:block;font-size:.92rem;color:var(--ink);}
.testi-who span{font-family:var(--font-mono);font-size:.72rem;color:var(--ink-faint);}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:56px;}
.contact-info-card{background:var(--bg-3);border:1px solid var(--line);border-radius:var(--radius);padding:36px;}
.contact-line{display:flex;gap:16px;margin-bottom:22px;}
.contact-line svg{flex:0 0 auto;width:20px;height:20px;stroke:var(--magma);margin-top:2px;}
.contact-line b{display:block;font-size:.94rem;color:var(--ink);}
.contact-line span{font-size:.88rem;color:var(--ink-faint);}
.legal-mini{margin-top:26px;padding-top:22px;border-top:1px solid var(--line);font-family:var(--font-mono);font-size:.72rem;color:var(--ink-faint);line-height:1.9;}
form.contact-form{background:var(--bg-3);border:1px solid var(--line);border-radius:var(--radius);padding:38px;}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-bottom:18px;}
.field{display:flex;flex-direction:column;gap:8px;}
.field.full{grid-column:1/-1;}
.field label{font-size:.8rem;color:var(--ink-dim);font-weight:600;}
.field input,.field select,.field textarea{
  background:var(--bg-2);border:1px solid var(--line);border-radius:3px;
  padding:12px 14px;color:var(--ink);font-family:var(--font-body);font-size:.94rem;
}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--magma);}
.field textarea{resize:vertical;min-height:110px;}
.consent{display:flex;gap:10px;align-items:flex-start;margin-bottom:22px;font-size:.84rem;color:var(--ink-faint);}
.consent input{margin-top:4px;}
.consent a{color:var(--magma-pale);text-decoration:underline;}

/* ---------- Footer ---------- */
footer{background:var(--bg-2);border-top:1px solid var(--line);padding:70px 0 30px;}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1.1fr;gap:40px;margin-bottom:50px;}
.footer-brand p{font-size:.88rem;max-width:280px;}
.footer-col h4{font-family:var(--font-body);text-transform:uppercase;font-size:.82rem;letter-spacing:.08em;color:var(--ink-faint);margin-bottom:18px;}
.footer-col ul li{margin-bottom:11px;}
.footer-col a{font-size:.9rem;color:var(--ink-dim);}
.footer-col a:hover{color:var(--magma-pale);}
.footer-legalid{font-family:var(--font-mono);font-size:.76rem;color:var(--ink-faint);line-height:2;}
.footer-bottom{
  border-top:1px solid var(--line);padding-top:24px;display:flex;
  justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:.8rem;color:var(--ink-faint);
}
.footer-bottom a{text-decoration:underline;}

/* ---------- Legal pages ---------- */
.legal-page{padding-top:150px;padding-bottom:100px;}
.legal-page h1{font-size:clamp(1.9rem,4vw,2.7rem);margin-bottom:.3em;}
.legal-updated{font-family:var(--font-mono);font-size:.8rem;color:var(--ink-faint);margin-bottom:44px;}
.legal-page h2{font-size:1.3rem;margin-top:2.2em;text-transform:none;color:var(--magma-pale);}
.legal-page h3{font-size:1.05rem;text-transform:none;color:var(--ink);}
.legal-page p,.legal-page li{color:var(--ink-dim);font-size:.98rem;}
.legal-page ul{list-style:disc;padding-left:1.4em;margin-bottom:1.2em;}
.legal-page ul li{margin-bottom:.5em;}
.legal-table{width:100%;border-collapse:collapse;margin:1.4em 0 2em;font-size:.9rem;}
.legal-table th,.legal-table td{border:1px solid var(--line);padding:12px 14px;text-align:left;vertical-align:top;}
.legal-table th{background:var(--bg-3);font-family:var(--font-mono);font-size:.76rem;letter-spacing:.04em;text-transform:uppercase;color:var(--ink-faint);}
.legal-table td{color:var(--ink-dim);}
.back-link{display:inline-flex;align-items:center;gap:8px;margin-bottom:36px;font-family:var(--font-mono);font-size:.82rem;color:var(--ink-faint);}
.back-link:hover{color:var(--magma-pale);}

/* ---------- Responsive ---------- */
@media (max-width:1080px){
  nav.main-nav{display:none;}
  .hamburger{display:flex;}
  .hero-grid{grid-template-columns:1fr;}
  .helix-wrap{margin-top:20px;}
  .services-grid,.gallery-grid,.testi-grid{grid-template-columns:repeat(2,1fr);}
  .service-wide{grid-column:span 2;grid-template-columns:1fr;}
  .process-row{grid-template-columns:repeat(3,1fr);}
  .process-row .process-step::after{display:none;}
  .why-grid,.contact-grid{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .stats-grid{grid-template-columns:repeat(2,1fr);}
  .stat:nth-child(3){border-left:none;}
}
@media (max-width:640px){
  .section{padding:66px 0;}
  .nav-phone{display:none;}
  .services-grid,.gallery-grid,.testi-grid,.process-row{grid-template-columns:1fr;}
  .service-wide{grid-column:span 1;}
  .stats-grid{grid-template-columns:repeat(2,1fr);}
  .stat{padding:30px 14px;}
  .form-row{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr;gap:32px;}
  .footer-bottom{flex-direction:column;}
  .hero-badges{gap:20px;}
}

/* Header overflow fix: on narrow phones the logo + header CTA + hamburger
   no longer fit on one row (nav-row is a non-wrapping flex row at fixed
   height). Shrink the logo and drop the header CTA in favour of the
   hamburger drawer, which already links to #contact. */
@media (max-width:520px){
  .container{padding:0 18px;}
  .logo{font-size:1.15rem;gap:8px;}
  .logo-mark{width:28px;height:28px;}
  .logo small{display:none;}
  .nav-right{gap:12px;}
  .nav-right .btn-primary.btn-sm{display:none;}
}

/* Mobile nav drawer */
#mobile-nav{
  position:fixed;inset:82px 0 0 0;background:var(--bg-1);z-index:790;
  display:none;flex-direction:column;padding:36px 28px;gap:26px;overflow-y:auto;
}
#mobile-nav.open{display:flex;}
#mobile-nav a{font-family:var(--font-head);font-size:1.4rem;text-transform:uppercase;color:var(--ink);}
#mobile-nav .nav-phone{display:flex;margin-top:10px;}