/* =========================================================
   Audit'Eau — Site vitrine
   Charte issue du logo et de la plaquette A3 « Assèchement »
   ========================================================= */

:root{
  --cyan:      #29B2C6;
  --cyan-dark: #1E8FA3;
  --blue:      #1B62D6;
  --violet:    #6B1FD6;
  --green:     #4A9E7F;

  --ink:       #0B0F14;
  --ink-soft:  #161C24;
  --body:      #46525F;
  --line:      #E3E9EF;
  --bg:        #FFFFFF;
  --bg-alt:    #F5F9FB;

  --grad: linear-gradient(120deg, var(--violet) 0%, var(--blue) 48%, var(--cyan) 100%);

  --wrap: 1180px;
  --radius: 14px;
  --shadow: 0 18px 50px -22px rgba(11,15,20,.35);

  --font: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}

*,*::before,*::after{ box-sizing:border-box; }

html{ scroll-behavior:smooth; scroll-padding-top:100px; }

body{
  margin:0;
  font-family:var(--font);
  font-size:17px;
  line-height:1.65;
  color:var(--body);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}

img{ max-width:100%; display:block; }

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

h1,h2,h3{ color:var(--ink); line-height:1.15; margin:0 0 .6em; }
h1{ font-size:clamp(2.4rem,5.5vw,4.1rem); font-weight:800; letter-spacing:-.02em; }
h2{ font-size:clamp(1.7rem,3.2vw,2.5rem); font-weight:700; letter-spacing:-.01em; }
h3{ font-size:1.18rem; font-weight:700; }

p{ margin:0 0 1em; }

.wrap{ width:100%; max-width:var(--wrap); margin-inline:auto; padding-inline:24px; }

.skip{
  position:absolute; left:-9999px; top:0; z-index:200;
  background:var(--ink); color:#fff; padding:12px 18px;
}
.skip:focus{ left:12px; top:12px; }

.grad{
  background:var(--grad);
  -webkit-background-clip:text; background-clip:text;
  color:transparent;
}

/* ---------- Boutons ---------- */
.btn{
  display:inline-block;
  background:var(--grad);
  color:#fff; text-decoration:none;
  font-weight:600; font-size:1rem;
  padding:14px 26px; border-radius:100px;
  box-shadow:0 12px 26px -12px rgba(27,98,214,.75);
  transition:transform .18s ease, box-shadow .18s ease, opacity .18s ease;
}
.btn:hover{ transform:translateY(-2px); box-shadow:0 18px 34px -14px rgba(27,98,214,.9); }
.btn-sm{ padding:9px 20px; font-size:.94rem; }
.btn-ghost{
  background:transparent; color:#fff;
  border:1.5px solid rgba(255,255,255,.6);
  box-shadow:none;
}
.btn-ghost:hover{ background:rgba(255,255,255,.14); box-shadow:none; }

/* ---------- Header ---------- */
.site-header{
  position:sticky; top:0; z-index:100;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid transparent;
  transition:border-color .25s ease, box-shadow .25s ease;
}
.site-header.scrolled{
  border-bottom-color:var(--line);
  box-shadow:0 6px 24px -18px rgba(11,15,20,.5);
}
.header-inner{
  display:flex; align-items:center; justify-content:space-between;
  gap:24px; min-height:92px;
}
.brand img{ height:72px; width:auto; display:block; }

.nav{ display:flex; align-items:center; gap:30px; }
.nav a{
  color:var(--ink); text-decoration:none;
  font-size:.98rem; font-weight:600;
}
.nav a:not(.btn){ position:relative; padding:4px 0; }
.nav a:not(.btn)::after{
  content:""; position:absolute; left:0; right:0; bottom:0;
  height:2px; background:var(--grad);
  transform:scaleX(0); transform-origin:left;
  transition:transform .22s ease;
}
.nav a:not(.btn):hover::after{ transform:scaleX(1); }
.nav .btn{ color:#fff; }

.burger{
  display:none; flex-direction:column; gap:5px;
  background:none; border:0; padding:8px; cursor:pointer;
}
.burger span{
  width:24px; height:2px; background:var(--ink); border-radius:2px;
  transition:transform .25s ease, opacity .2s ease;
}
.burger[aria-expanded="true"] span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
.burger[aria-expanded="true"] span:nth-child(2){ opacity:0; }
.burger[aria-expanded="true"] span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero{ position:relative; background:var(--ink); overflow:hidden; }
.hero-media{ position:absolute; inset:0; }
.hero-media img,
.hero-video{
  width:100%; height:100%;
  object-fit:cover; object-position:center 55%;
  display:block;
}
/* Le poster reste affiché tant que la vidéo n'est pas jouée : jamais de trou noir */
.hero-video{ background:url("../img/hero-poster.jpg") center 55%/cover no-repeat; }
.hero-media::after{
  content:""; position:absolute; inset:0;
  background:
    linear-gradient(100deg, rgba(11,15,20,.92) 0%, rgba(11,15,20,.78) 42%, rgba(11,15,20,.25) 72%, rgba(11,15,20,.05) 100%),
    linear-gradient(to top, rgba(11,15,20,.55), transparent 45%);
}
.hero-inner{
  position:relative;
  padding:clamp(80px,11vw,140px) 24px clamp(90px,12vw,150px);
  max-width:var(--wrap);
}
.hero h1{ color:#fff; max-width:12ch; margin-bottom:.35em; }
.hero-sub{
  color:#fff; font-size:clamp(1.1rem,2vw,1.4rem);
  font-weight:600; max-width:34ch; margin-bottom:.7em;
}
.hero-baseline{
  color:rgba(255,255,255,.75);
  font-style:italic; font-size:1.03rem;
  max-width:44ch; margin-bottom:2.2em;
}
.badge{
  display:inline-flex; align-items:center; gap:10px;
  border:1px solid rgba(41,178,198,.55);
  background:rgba(41,178,198,.12);
  color:#7FE3F2;
  font-size:.78rem; font-weight:700;
  letter-spacing:.12em; text-transform:uppercase;
  padding:6px 18px 6px 8px; border-radius:100px;
  margin:0 0 1.6em;
}
.badge-inpi{
  width:38px; height:38px; border-radius:50%;
  background:#fff; padding:3px;
  flex:none;
}
.hero-cta{ display:flex; flex-wrap:wrap; gap:14px; }

/* Sceau INPI « brevet déposé » — mis en avant sur le visuel du hero */
.hero-seal{
  position:absolute; z-index:3;
  right:clamp(20px,5vw,64px); bottom:clamp(24px,5vw,54px);
  width:clamp(96px,12vw,150px); height:auto;
  filter:drop-shadow(0 10px 26px rgba(0,0,0,.45));
  animation:seal-in .7s cubic-bezier(.2,.9,.3,1.4) both .3s;
}
@keyframes seal-in{
  from{ opacity:0; transform:rotate(-14deg) scale(.6); }
  to{ opacity:1; transform:rotate(-8deg) scale(1); }
}
@media (prefers-reduced-motion:reduce){
  .hero-seal{ animation:none; transform:rotate(-8deg); }
}

/* ---------- Sections ---------- */
.section{ padding:clamp(64px,8vw,110px) 0; }

.eyebrow{
  font-size:.78rem; font-weight:800;
  letter-spacing:.16em; text-transform:uppercase;
  color:var(--cyan-dark); margin:0 0 .9em;
}
.eyebrow.light{ color:var(--cyan); text-align:center; }

.h2-center{ text-align:center; max-width:22ch; margin-inline:auto; margin-bottom:1.6em; }
.h2-center.light, .pillars h2.light{ color:#fff; }

.prose p:last-child{ margin-bottom:0; }
.prose strong{ color:var(--ink); }

.grid-2{
  display:grid; grid-template-columns:1fr 1fr;
  gap:clamp(32px,5vw,72px);
}
.grid-2.align-center{ align-items:center; }

/* Problème */
.problem{ background:var(--bg-alt); border-block:1px solid var(--line); }
.problem h2{ max-width:14ch; }

/* Solution */
.cards-2{
  display:grid; grid-template-columns:repeat(2,1fr);
  gap:24px;
}
.card-solid{
  background:var(--cyan);
  color:#fff;
  padding:clamp(28px,3.4vw,40px);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.card-solid h3{ color:#fff; font-size:1.22rem; }
.card-solid p{ margin-bottom:0; color:rgba(255,255,255,.94); }
.card-solid strong{ color:#fff; }

/* Piliers */
.pillars{ background:var(--ink); position:relative; }
.pillar-line{
  max-width:760px; height:2px; margin:0 auto 0;
  background:repeating-linear-gradient(90deg, rgba(255,255,255,.28) 0 6px, transparent 6px 14px);
  transform:translateY(34px);
}
.cards-3{
  display:grid; grid-template-columns:repeat(3,1fr);
  gap:clamp(24px,3vw,48px);
  text-align:center;
}
.pillar p{ color:rgba(255,255,255,.72); font-size:.98rem; }
.pillar h3{
  color:#fff; text-transform:uppercase;
  letter-spacing:.14em; font-size:1.05rem; font-weight:700;
  margin-top:1.1em;
}
.pillar strong{ color:#fff; }
.pill-icon{
  display:inline-flex; align-items:center; justify-content:center;
  width:66px; height:66px; border-radius:50%;
  position:relative; z-index:1;
}
.pill-icon svg{
  width:30px; height:30px;
  fill:none; stroke:#fff; stroke-width:1.7;
  stroke-linecap:round; stroke-linejoin:round;
}
.icon-cyan{ background:var(--cyan); }
.icon-blue{ background:var(--blue); }
.icon-green{ background:var(--green); }

/* Chiffres clés */
.stats{ background:var(--ink); }
.stats-grid{
  display:grid; grid-template-columns:repeat(3,1fr);
  gap:20px;
}
.stat{
  text-align:center;
  padding:30px 16px;
  border:1px solid rgba(255,255,255,.12);
  border-radius:var(--radius);
  background:rgba(255,255,255,.04);
}
.stat-num{
  display:block;
  font-size:clamp(1.8rem,3vw,2.5rem); font-weight:800;
  letter-spacing:-.02em; line-height:1.1;
  background:var(--grad);
  -webkit-background-clip:text; background-clip:text;
  color:transparent;
  margin-bottom:8px;
}
.stat-label{
  display:block;
  color:rgba(255,255,255,.7);
  font-size:.95rem;
}
.count{ font-variant-numeric:tabular-nums; }

/* Bilan carbone — économie de CO₂ */
.carbon-proof{
  margin:clamp(44px,6vw,72px) auto 0;
  max-width:920px;
  display:grid; grid-template-columns:auto 1fr;
  gap:clamp(28px,5vw,60px);
  align-items:center;
}
.carbon-doc{
  width:clamp(190px,24vw,290px); height:auto;
  border-radius:8px;
  border:1px solid rgba(255,255,255,.14);
  box-shadow:0 28px 64px -22px rgba(0,0,0,.7);
  transform:rotate(-2.5deg);
}
.carbon-text h3{ color:#fff; font-size:clamp(1.2rem,2vw,1.5rem); }
.carbon-text p{ color:rgba(255,255,255,.74); margin-bottom:.9em; }
.carbon-text p:last-child{ margin-bottom:0; }
.carbon-text strong{ color:#fff; }

/* Notre approche */
.approach{ background:var(--bg-alt); border-block:1px solid var(--line); }
.approach-intro{
  max-width:60ch; margin:-1em auto 3em;
  text-align:center;
}
.approach-grid{ text-align:left; }
.approach-card{
  background:#fff;
  border:1px solid var(--line);
  border-top:4px solid var(--cyan);
  border-radius:var(--radius);
  padding:30px 28px;
}
.approach-card h3{ font-size:1.1rem; margin-bottom:.7em; }
.approach-card p{ margin-bottom:0; font-size:.98rem; }
.approach-card strong{ color:var(--ink); }
.quote{
  text-align:center; max-width:52ch;
  margin:44px auto 0;
  font-size:clamp(1.1rem,1.8vw,1.3rem);
  color:var(--ink);
}
.quote strong{ color:var(--ink); }

/* Galerie chantier */
.field-intro{
  max-width:64ch; margin:-1em auto 3em;
  text-align:center;
}
/* Mosaïque : 4 colonnes, tuiles de tailles inégales */
.field-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  grid-auto-rows:210px;
  grid-auto-flow:dense;
  gap:16px;
}
.tile{
  position:relative; margin:0; overflow:hidden;
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.tile img{
  position:absolute; inset:0;
  width:100%; height:100%;
  object-fit:cover; display:block;
  transition:transform .6s ease;
}
.tile:hover img{ transform:scale(1.06); }
.tile figcaption{
  position:absolute; left:0; right:0; bottom:0;
  padding:34px 16px 14px;
  color:#fff; font-size:.9rem; font-weight:600;
  line-height:1.35;
  background:linear-gradient(to top, rgba(11,15,20,.88) 15%, rgba(11,15,20,.55) 55%, transparent);
}
/* Tailles : une grande tuile d'accroche, deux bandeaux larges */
.tile-lg{ grid-column:span 2; grid-row:span 2; }
.tile-w2{ grid-column:span 2; }
.tile-w3{ grid-column:span 3; }
.tile-lg figcaption{ font-size:1rem; padding:40px 20px 18px; }

/* Mentions légales */
.legal{ padding-top:clamp(48px,6vw,80px); }
.legal h1{
  font-size:clamp(2rem,4vw,2.8rem);
  margin-bottom:1.2em;
}
.legal-body{ max-width:70ch; }
.legal-body h2{
  font-size:1.15rem;
  margin-top:2.2em; margin-bottom:.7em;
  padding-top:1.2em;
  border-top:1px solid var(--line);
}
.legal-body h2:first-child{ margin-top:0; padding-top:0; border-top:0; }
.legal-body p{ margin-bottom:1em; }
.legal-body strong{ color:var(--ink); }
.legal-list{
  list-style:none; margin:1.2em 0 0; padding:0;
  display:grid; gap:10px;
}
.legal-list li{
  display:flex; flex-wrap:wrap; gap:6px 18px;
  justify-content:space-between; align-items:baseline;
  padding-bottom:10px;
  border-bottom:1px solid var(--line);
}
.legal-list span{ font-size:.95rem; }
.legal-back{ margin-top:3em; }

/* FAQ */
.faq-list{ max-width:840px; margin-inline:auto; display:grid; gap:14px; }
.faq-list details{
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:#fff;
  overflow:hidden;
  transition:border-color .2s ease, box-shadow .2s ease;
}
.faq-list details[open]{
  border-color:rgba(41,178,198,.5);
  box-shadow:0 14px 40px -26px rgba(11,15,20,.5);
}
.faq-list summary{
  cursor:pointer; list-style:none;
  padding:20px 56px 20px 24px;
  font-weight:700; color:var(--ink); font-size:1.05rem;
  position:relative;
}
.faq-list summary::-webkit-details-marker{ display:none; }
.faq-list summary::after{
  content:""; position:absolute; right:24px; top:50%;
  width:9px; height:9px;
  border-right:2px solid var(--cyan-dark);
  border-bottom:2px solid var(--cyan-dark);
  transform:translateY(-70%) rotate(45deg);
  transition:transform .22s ease;
}
.faq-list details[open] summary::after{ transform:translateY(-25%) rotate(-135deg); }
.faq-body{ padding:0 24px 22px; }
.faq-body p:last-child{ margin-bottom:0; }
.faq-body ul{ margin:0 0 1em; padding-left:20px; }
.faq-body strong{ color:var(--ink); }

/* Contact */
.contact{ background:var(--ink); }
.contact-intro{
  color:rgba(255,255,255,.72);
  text-align:center; max-width:56ch;
  margin:-1em auto 3em;
}
.contact-grid{
  display:grid; grid-template-columns:repeat(3,1fr);
  gap:20px;
}
.contact-card{
  display:flex; flex-direction:column; align-items:center; text-align:center;
  gap:6px;
  padding:34px 24px;
  border:1px solid rgba(255,255,255,.14);
  border-radius:var(--radius);
  background:rgba(255,255,255,.04);
  text-decoration:none;
  transition:transform .2s ease, border-color .2s ease, background .2s ease;
}
.contact-card:hover{
  transform:translateY(-4px);
  border-color:rgba(41,178,198,.6);
  background:rgba(41,178,198,.08);
}
.contact-icon{
  display:inline-flex; align-items:center; justify-content:center;
  width:52px; height:52px; border-radius:50%;
  background:var(--grad); margin-bottom:8px;
}
.contact-icon svg{
  width:23px; height:23px;
  fill:none; stroke:#fff; stroke-width:1.7;
  stroke-linecap:round; stroke-linejoin:round;
}
.contact-label{
  color:var(--cyan); font-size:.76rem; font-weight:800;
  letter-spacing:.14em; text-transform:uppercase;
}
.contact-value{ color:#fff; font-weight:600; font-size:1.05rem; line-height:1.5; }

/* Footer */
.site-footer{ background:#05080B; padding:56px 0 40px; }
.footer-inner{ text-align:center; }
.footer-logo{
  height:92px; width:auto; margin:0 auto 20px;
  opacity:.95;
}
.footer-tag{ color:rgba(255,255,255,.6); font-size:.95rem; }
.footer-legal{
  color:rgba(255,255,255,.38); font-size:.85rem;
  margin:22px 0 0; padding-top:22px;
  border-top:1px solid rgba(255,255,255,.1);
}
.footer-legal a{ color:rgba(255,255,255,.6); text-decoration:none; }
.footer-legal a:hover{ color:var(--cyan); }

/* ---------- Responsive ---------- */
@media (max-width:900px){
  .grid-2, .cards-2, .cards-3, .contact-grid{ grid-template-columns:1fr; }
  .pillar-line{ display:none; }

  /* Mosaïque sur 2 colonnes. tile-w2 repasse sur 1 colonne pour s'apparier
     avec la tuile restante : sinon la grille laisse un trou. */
  .field-grid{ grid-template-columns:repeat(2,1fr); grid-auto-rows:190px; }
  .tile-lg{ grid-column:span 2; grid-row:span 2; }
  .tile-w2{ grid-column:span 1; }
  .tile-w3{ grid-column:span 2; }

  .carbon-proof{
    grid-template-columns:1fr; justify-items:center; text-align:center;
    gap:28px;
  }
  .carbon-doc{ width:clamp(200px,52vw,260px); transform:none; }
  .problem h2, .h2-center{ max-width:none; }

  .burger{ display:flex; }
  .nav{
    position:fixed; inset:92px 0 auto;
    flex-direction:column; align-items:stretch; gap:0;
    background:#fff;
    border-bottom:1px solid var(--line);
    box-shadow:0 20px 40px -24px rgba(11,15,20,.5);
    padding:8px 24px 22px;
    transform:translateY(-140%);
    transition:transform .3s ease;
  }
  .nav.open{ transform:translateY(0); }
  .nav a{ padding:15px 0; border-bottom:1px solid var(--line); }
  .nav a:not(.btn)::after{ display:none; }
  .nav .btn{ margin-top:16px; text-align:center; border-bottom:0; }

  .hero-media img{ object-position:center 30%; }
  .hero-media::after{
    background:linear-gradient(to top, rgba(11,15,20,.95) 30%, rgba(11,15,20,.62) 75%, rgba(11,15,20,.4));
  }
  .hero h1, .hero-sub{ max-width:none; }
}

@media (max-width:620px){
  .stats-grid{ grid-template-columns:1fr; }
  /* Une seule colonne : la grande tuile reste plus haute pour garder du rythme */
  .field-grid{ grid-template-columns:1fr; grid-auto-rows:200px; }
  .tile-lg, .tile-w2, .tile-w3{ grid-column:span 1; }
  .tile-lg{ grid-row:span 2; }
}

@media (max-width:520px){
  body{ font-size:16px; }
  .hero-cta .btn{ width:100%; text-align:center; }
  .badge{ font-size:.7rem; letter-spacing:.08em; padding:5px 14px 5px 6px; }
  .badge-inpi{ width:30px; height:30px; }
  /* Le sceau se place sous les boutons, dans la bande sombre du bas du hero */
  .hero-inner{ padding-bottom:150px; }
  .hero-seal{ width:88px; right:14px; bottom:30px; }
}

@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }
  *{ transition:none !important; animation:none !important; }
}