/* ==========================================================================
   BioThermal HP (biothermalhp.com) – feuille de style unique, design repris d’impactbiosystem.eco
   Identité : voir 00_Regles_identite_Impact_Biosystem.md
   Couleurs : Émeraude #00A88A (graphismes uniquement), Émeraude foncé #007E67
   (textes colorés, fonds avec texte blanc), Noir texte #231F20, Blanc #FFFFFF.
   Police unique : Nunito Sans (auto-hébergée, licence OFL).
   ========================================================================== */

@font-face {
  font-family: "Nunito Sans";
  font-style: normal;
  font-display: swap;
  font-weight: 200 1000;
  src: url("../fonts/nunito-sans-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Nunito Sans";
  font-style: normal;
  font-display: swap;
  font-weight: 200 1000;
  src: url("../fonts/nunito-sans-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

:root {
  /* Bleu BioThermal HP (logo d’origine) : #0080C9 pour les graphismes, #0670B0 pour les
     textes colorés et les fonds avec texte blanc. ImpactGreening garde son vert (--vert).
     Les noms « emeraude » sont gardés pour la compatibilité avec impactbiosystem.eco. */
  --emeraude: #0080C9;
  --emeraude-fonce: #0670B0;
  --emeraude-nuit: #05578A;
  --vert: #00A88A;
  --vert-fonce: #007E67;
  --noir: #1D1D1B;
  --gris: #5B5657;
  --blanc: #FFFFFF;
  --brume: #F0F6FB;
  --filet: #D6E6F2;
  --max: 1200px;
  --gutter: clamp(20px, 5vw, 48px);
  --radius: 6px;
  --font: "Nunito Sans", Arial, Helvetica, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 18px;
  line-height: 1.6;
  color: var(--noir);
  background: var(--blanc);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--emeraude-fonce); text-underline-offset: 3px; }
a:hover { color: var(--emeraude-nuit); }
:focus-visible { outline: 3px solid var(--emeraude); outline-offset: 3px; border-radius: 2px; }

h1, h2, h3 { line-height: 1.08; margin: 0; letter-spacing: -0.015em; }
h1 { font-weight: 800; font-size: clamp(44px, 6.4vw, 84px); }
h2 { font-weight: 800; font-size: clamp(32px, 4.4vw, 52px); }
h3 { font-weight: 700; font-size: 21px; line-height: 1.25; letter-spacing: 0; }
p { margin: 0 0 1em; }
.accent { color: var(--emeraude-fonce); }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.section { padding: clamp(72px, 10vw, 128px) 0; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 14px; font-weight: 800; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--emeraude-fonce); margin-bottom: 20px;
}
.eyebrow::before { content: ""; width: 28px; height: 2px; background: var(--emeraude); }
.lead { font-size: clamp(19px, 1.6vw, 22px); line-height: 1.55; color: var(--gris); max-width: 40em; }
.section-head { max-width: 760px; margin-bottom: clamp(40px, 6vw, 64px); }
.section-head h2 { margin-bottom: 20px; }

.skip-link { position: absolute; left: -9999px; top: 8px; background: var(--emeraude-fonce); color: #fff; padding: 10px 16px; z-index: 100; }
.skip-link:focus { left: 8px; color: #fff; }

/* ---------- Boutons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 52px; padding: 0 26px; border-radius: 999px;
  font: 700 17px/1 var(--font); text-decoration: none; cursor: pointer;
  border: 2px solid var(--emeraude-fonce); transition: background .2s, color .2s, border-color .2s;
}
.btn-primary { background: var(--emeraude-fonce); color: #fff; }
.btn-primary:hover { background: var(--emeraude-nuit); border-color: var(--emeraude-nuit); color: #fff; }
.btn-ghost { background: transparent; color: var(--emeraude-fonce); }
.btn-ghost:hover { background: var(--emeraude-fonce); color: #fff; }
.btn-light { background: #fff; color: var(--emeraude-fonce); border-color: #fff; }
.btn-light:hover { background: transparent; color: #fff; }
.btn svg { width: 18px; height: 18px; flex: none; }

/* ---------- En-tête ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.96); backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid transparent; transition: border-color .2s;
}
.site-header.scrolled { border-bottom-color: var(--filet); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 80px; gap: 24px; }
.brand { display: block; flex: none; }
.brand img { width: 168px; height: auto; }
.nav { display: flex; align-items: center; gap: 30px; margin-left: auto; margin-right: 12px; }
.nav-links { display: flex; gap: 26px; list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--noir); text-decoration: none; font-weight: 600; font-size: 16px; padding: 6px 0; border-bottom: 2px solid transparent; }
.nav-links a:hover { color: var(--emeraude-fonce); border-bottom-color: var(--emeraude); }
.header-tools { display: flex; align-items: center; gap: 8px; }

/* Sélecteur de langue (menu déroulant) */
.lang-menu { position: relative; }
.lang-btn {
  display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 0 14px;
  background: #fff; border: 1px solid var(--filet); border-radius: 999px; cursor: pointer;
  font: 700 15px/1 var(--font); color: var(--noir);
}
.lang-btn:hover, .lang-btn[aria-expanded="true"] { border-color: var(--emeraude-fonce); color: var(--emeraude-fonce); }
.lang-btn svg { width: 18px; height: 18px; flex: none; }
.lang-btn .chev { width: 14px; height: 14px; transition: transform .2s; }
.lang-btn[aria-expanded="true"] .chev { transform: rotate(180deg); }
.lang-list {
  position: absolute; right: 0; top: calc(100% + 8px); min-width: 190px; margin: 0; padding: 6px;
  list-style: none; background: #fff; border: 1px solid var(--filet); border-radius: 10px;
  box-shadow: 0 16px 40px rgba(35,31,32,.12); z-index: 60;
}
.lang-list[hidden] { display: none; }
.lang-list a {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 11px 12px; border-radius: 6px; text-decoration: none; color: var(--noir); font-weight: 600; font-size: 16px;
}
.lang-list a:hover { background: var(--brume); color: var(--emeraude-fonce); }
.lang-list a[aria-current] { color: var(--emeraude-fonce); }
.lang-list a[aria-current]::after { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--emeraude); }
.lang-list abbr { text-decoration: none; font-size: 13px; color: var(--gris); font-weight: 700; }
.nav-toggle { display: none; background: none; border: 0; width: 48px; height: 48px; padding: 12px; cursor: pointer; color: var(--noir); }
.nav-toggle svg { width: 24px; height: 24px; }

@media (max-width: 960px) {
  .nav-toggle { display: block; }
  .nav {
    position: fixed; inset: 80px 0 auto 0; background: #fff; flex-direction: column; align-items: stretch;
    gap: 0; padding: 8px var(--gutter) 24px; border-bottom: 1px solid var(--filet);
    box-shadow: 0 20px 40px rgba(35,31,32,.08); display: none;
  }
  .nav.open { display: flex; }
  .nav-links { flex-direction: column; gap: 0; }
  .nav-links a { display: block; padding: 14px 0; border-bottom: 1px solid var(--filet); font-size: 18px; }
  .brand img { width: 150px; }
}

/* ---------- Hero ---------- */
.hero { padding: clamp(40px, 7vw, 88px) 0 clamp(56px, 7vw, 96px); }
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: clamp(32px, 5vw, 64px); align-items: center; }
.hero h1 { margin-bottom: 28px; }
.hero .lead { margin-bottom: 36px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-media { position: relative; }
.hero-media img { width: 100%; aspect-ratio: 4 / 4.4; object-fit: cover; border-radius: var(--radius); }
.hero-media figcaption { position: absolute; left: 16px; bottom: 16px; background: rgba(255,255,255,.92); padding: 6px 12px; border-radius: 4px; font-size: 13px; color: var(--gris); }
@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-media img { aspect-ratio: 16 / 11; }
}

/* ---------- Chiffres ---------- */
.stats { border-top: 1px solid var(--filet); border-bottom: 1px solid var(--filet); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat { padding: 36px 24px 34px 0; }
.stat + .stat { padding-left: 28px; border-left: 1px solid var(--filet); }
.stat-value { font-size: clamp(36px, 4vw, 52px); font-weight: 800; line-height: 1; color: var(--emeraude-fonce); letter-spacing: -0.02em; }
.stat-value small { font-size: .5em; font-weight: 700; margin-left: 4px; }
.stat-label { margin-top: 10px; font-size: 16px; color: var(--gris); line-height: 1.4; }
@media (max-width: 760px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat, .stat + .stat { padding: 26px 16px; border-left: 0; }
  .stat:nth-child(even) { border-left: 1px solid var(--filet); }
  .stat:nth-child(n+3) { border-top: 1px solid var(--filet); }
}

/* ---------- Bandeau motif (aucun texte par-dessus) ---------- */
.motif-band { height: clamp(64px, 7vw, 100px); margin-block: clamp(8px, 2vw, 24px); background: url("../img/motif_bt.svg") left center / auto 100% repeat-x; }
.motif-band.blanc { height: clamp(48px, 5vw, 72px); margin: 0; background-image: url("../img/motif_bt_blanc.svg"); background-color: var(--emeraude-fonce); border-top: clamp(20px, 3vw, 32px) solid var(--emeraude-fonce); }

/* ---------- Domaines ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px; background: var(--filet); border: 2px solid var(--filet); border-radius: var(--radius); overflow: hidden; }
.card { background: #fff; padding: 36px 32px 38px; display: flex; flex-direction: column; gap: 14px; }
.card-icon { width: 56px; height: 40px; color: var(--emeraude); }
.card p { margin: 0; color: var(--gris); font-size: 17px; }
.card-num { font-size: 13px; font-weight: 800; letter-spacing: .14em; color: var(--emeraude-fonce); }
@media (max-width: 960px) { .cards { grid-template-columns: 1fr 1fr; } }
@media (max-width: 620px) { .cards { grid-template-columns: 1fr; } }

/* ---------- Strates (signification du symbole) ---------- */
.strata { background: var(--brume); }
.strata-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: clamp(40px, 6vw, 96px); align-items: center; }
.strata-figure { position: relative; max-width: 460px; width: 100%; justify-self: center; }
.strata-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.strata-list li { display: grid; grid-template-columns: 52px 1fr; gap: 18px; padding: 18px 0; border-bottom: 1px solid var(--filet); align-items: start; }
.strata-list li:first-child { border-top: 1px solid var(--filet); }
.strata-list svg { width: 52px; height: 26px; color: var(--emeraude); margin-top: 3px; }
.strata-list strong { display: block; font-size: 18px; }
.strata-list span { color: var(--gris); font-size: 16px; }
@media (max-width: 860px) { .strata-grid { grid-template-columns: 1fr; } .strata-figure { max-width: 260px; } }

/* ---------- BioThermal HP ---------- */
.biothermal { background: var(--emeraude-fonce); color: #fff; }
.biothermal .eyebrow { color: #fff; }
.biothermal .eyebrow::before { background: #fff; }
.biothermal .lead { color: rgba(255,255,255,.9); }
.biothermal-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(36px, 6vw, 88px); align-items: start; }
.biothermal h2 { margin-bottom: 24px; }
.check-list { list-style: none; padding: 0; margin: 0 0 36px; display: grid; gap: 14px; }
.check-list li { display: grid; grid-template-columns: 26px 1fr; gap: 12px; font-size: 17px; line-height: 1.5; }
.check-list svg { width: 22px; height: 22px; margin-top: 2px; }
.biothermal-media img { border-radius: var(--radius); width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.patent { margin-top: 28px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.3); font-size: 16px; color: rgba(255,255,255,.92); }
.patent strong { display: block; font-size: 13px; letter-spacing: .14em; text-transform: uppercase; margin-bottom: 6px; color: #fff; }
.biothermal-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.biothermal .btn-ghost { color: #fff; border-color: #fff; }
.biothermal .btn-ghost:hover { background: #fff; color: var(--emeraude-fonce); }
@media (max-width: 860px) { .biothermal-grid { grid-template-columns: 1fr; } }

/* ---------- À propos ---------- */
.about-grid { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: clamp(36px, 6vw, 96px); align-items: start; }
.about-card { border-top: 3px solid var(--emeraude); padding-top: 28px; }
.about-card .name { font-size: 26px; font-weight: 800; line-height: 1.2; }
.about-card .title { color: var(--gris); margin: 6px 0 24px; }
.facts { list-style: none; margin: 0 0 28px; padding: 0; display: grid; gap: 10px; font-size: 16px; }
.facts li { display: grid; grid-template-columns: 22px 1fr; gap: 10px; }
.facts svg { width: 18px; height: 18px; margin-top: 4px; color: var(--emeraude-fonce); }
.social { display: flex; gap: 12px; flex-wrap: wrap; }
.social a { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 0 16px; border: 1px solid var(--filet); border-radius: 999px; text-decoration: none; font-weight: 700; font-size: 15px; color: var(--noir); }
.social a:hover { border-color: var(--emeraude-fonce); color: var(--emeraude-fonce); }
.social svg { width: 18px; height: 18px; }
.about-text h2 { margin-bottom: 28px; }
.about-text p:not(.eyebrow) { font-size: 18px; }
.about-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; padding: 0; list-style: none; }
.about-tags li { background: var(--brume); color: var(--emeraude-nuit); font-weight: 700; font-size: 14px; padding: 7px 14px; border-radius: 999px; }
@media (max-width: 860px) { .about-grid { grid-template-columns: 1fr; } .about-card { order: 2; } }

/* ---------- Contact ---------- */
.contact { border-top: 1px solid var(--filet); }
.contact-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(36px, 6vw, 96px); align-items: center; }
.contact h2 { margin-bottom: 20px; }
.contact-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 2px; background: var(--filet); border: 2px solid var(--filet); border-radius: var(--radius); overflow: hidden; }
.contact-list a, .contact-list div { display: grid; grid-template-columns: 48px 1fr; gap: 16px; align-items: center; padding: 22px 24px; background: #fff; text-decoration: none; color: var(--noir); }
.contact-list a:hover { background: var(--brume); }
.contact-list .ic { width: 48px; height: 48px; border-radius: 50%; background: var(--brume); display: grid; place-items: center; color: var(--emeraude-fonce); }
.contact-list .ic svg { width: 22px; height: 22px; }
.contact-list small { display: block; font-size: 13px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: var(--gris); }
.contact-list b { font-size: 19px; font-weight: 700; word-break: break-word; }
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; } }

/* ---------- Pied de page ---------- */
.site-footer { background: var(--emeraude-fonce); color: #fff; font-size: 15px; }
.site-footer a { color: #fff; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr 1fr; gap: 32px; padding: 56px 0 40px; }
.footer-grid img { width: 180px; margin-bottom: 18px; }
.footer-grid h4 { margin: 0 0 12px; font-size: 13px; letter-spacing: .14em; text-transform: uppercase; font-weight: 800; }
.footer-grid p { margin: 0; line-height: 1.7; color: rgba(255,255,255,.92); }
.footer-legal { border-top: 1px solid rgba(255,255,255,.28); padding: 22px 0 30px; display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; font-size: 14px; color: rgba(255,255,255,.88); }
.footer-legal details summary { cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.footer-legal details[open] { flex-basis: 100%; }
.footer-legal details div { margin-top: 12px; max-width: 760px; line-height: 1.6; }
@media (max-width: 860px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .footer-grid { grid-template-columns: 1fr; } }

/* ---------- Apparition douce ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }
.no-js .reveal { opacity: 1; transform: none; }

/* ==========================================================================
   Domaines par couches – du haut (atmosphère) vers le bas (échanges)
   ========================================================================== */
.layers-intro { display: grid; grid-template-columns: 1.4fr 1fr; gap: clamp(32px, 6vw, 96px); align-items: end; margin-bottom: clamp(48px, 7vw, 80px); }
.layers-intro .lead { margin: 0; }
.layers-intro-symbol { justify-self: end; width: 100%; max-width: 220px; }
@media (max-width: 860px) { .layers-intro { grid-template-columns: 1fr; } .layers-intro-symbol { justify-self: start; max-width: 140px; order: -1; } }

.layers { list-style: none; margin: 0; padding: 0; counter-reset: layer; }
.layer {
  display: grid; grid-template-columns: 64px 1fr 1.05fr; gap: clamp(20px, 4vw, 56px);
  padding: clamp(32px, 4.5vw, 52px) 0; border-top: 1px solid var(--filet); align-items: start;
}
.layer:last-child { border-bottom: 1px solid var(--filet); }
.layer-rail { display: flex; flex-direction: column; align-items: center; gap: 10px; padding-top: 4px; }
.layer-rail svg { width: 52px; height: 26px; color: var(--emeraude); }
.layer-rail span { font-size: 13px; font-weight: 800; letter-spacing: .1em; color: var(--emeraude-fonce); }
.layer-meta { font-size: 13px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; color: var(--emeraude-fonce); margin-bottom: 6px; }
.layer-meaning { font-size: 15px; color: var(--gris); margin-bottom: 18px; font-style: italic; }
.layer h3 { font-size: clamp(24px, 2.4vw, 30px); font-weight: 800; letter-spacing: -0.01em; margin-bottom: 14px; }
.layer p { color: var(--gris); font-size: 17px; }
.layer .tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 0; padding: 0; list-style: none; }
.layer .tags li { background: var(--brume); color: var(--emeraude-nuit); font-weight: 700; font-size: 13px; padding: 6px 12px; border-radius: 999px; }
.layer-link { display: inline-flex; align-items: center; gap: 8px; margin-top: 18px; font-weight: 700; text-decoration: none; }
.layer-link svg { width: 18px; height: 18px; }
.layer-visual { margin: 0; border-radius: var(--radius); overflow: hidden; aspect-ratio: 16 / 10; background: var(--brume); }
.layer-visual img { width: 100%; height: 100%; object-fit: cover; }
/* Visuel provisoire : la rangée du motif correspondant à la couche (à remplacer par une photo) */
.layer-visual.motif { background: var(--brume) url("../img/motif_bt.svg") center / auto 60% repeat-x; }
.layer-visual.motif[data-layer="1"] { --y: 3%; }
.layer-visual.motif[data-layer="2"] { --y: 22.6%; }
.layer-visual.motif[data-layer="3"] { --y: 41.6%; }
.layer-visual.motif[data-layer="4"] { --y: 59.2%; }
.layer-visual.motif[data-layer="5"] { --y: 78.1%; }
.layer-visual.motif[data-layer="6"] { --y: 96.7%; }
@media (max-width: 960px) {
  .layer { grid-template-columns: 52px 1fr; }
  .layer-visual { grid-column: 2; }
}
@media (max-width: 560px) {
  .layer { grid-template-columns: 1fr; gap: 16px; }
  .layer-rail { flex-direction: row; justify-content: flex-start; }
  .layer-visual { grid-column: 1; }
}

.transversal {
  margin-top: clamp(40px, 6vw, 64px); padding: clamp(28px, 4vw, 40px); border-radius: var(--radius);
  background: var(--brume); display: grid; grid-template-columns: auto 1fr; gap: 24px; align-items: center;
}
.transversal .ic { width: 64px; height: 64px; border-radius: 50%; background: #fff; display: grid; place-items: center; color: var(--emeraude-fonce); }
.transversal .ic svg { width: 30px; height: 30px; }
.transversal h3 { font-size: 22px; font-weight: 800; margin-bottom: 6px; }
.transversal p { margin: 0; color: var(--gris); font-size: 17px; }
@media (max-width: 560px) { .transversal { grid-template-columns: 1fr; } }

/* Spécialisation (À propos) */
.expertise-box { margin: 28px 0; padding: 24px 26px; border-left: 0; border-radius: var(--radius); background: var(--brume); }
.expertise-box strong { display: block; font-size: 13px; letter-spacing: .14em; text-transform: uppercase; color: var(--emeraude-fonce); margin-bottom: 8px; }
.expertise-box p { margin: 0; color: var(--noir) !important; }
/* Schémas (fond blanc, image entière) */
.layer-visual.diagram { background: #fff; border: 1px solid var(--filet); padding: 14px; }
.layer-visual.diagram img { object-fit: contain; }

/* Encadré médiation scientifique (À propos) */
.partner-box { display: grid; grid-template-columns: 56px 1fr; gap: 18px; align-items: start; margin: 28px 0 8px; padding: 24px 26px; border: 2px solid var(--emeraude); border-radius: var(--radius); background: #fff; }
.partner-box .ic { width: 56px; height: 56px; border-radius: 50%; background: var(--brume); display: grid; place-items: center; color: var(--emeraude-fonce); }
.partner-box .ic svg { width: 26px; height: 26px; }
.partner-box strong { display: block; font-size: 13px; letter-spacing: .14em; text-transform: uppercase; color: var(--emeraude-fonce); margin-bottom: 4px; }
.partner-box .partner-name { font-size: 22px; font-weight: 800; color: var(--noir); margin-bottom: 8px; line-height: 1.2; }
.partner-box p { margin: 0; color: var(--gris) !important; font-size: 17px !important; }
@media (max-width: 520px) { .partner-box { grid-template-columns: 1fr; } }

/* ==========================================================================
   Ajouts propres à biothermalhp.com
   ========================================================================== */

/* Marque : symbole Impact Biosystem + nom du produit (BioThermal HP n'a pas de logo propre) */
.brand-bt { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--noir); flex: none; }
.brand-bt img { width: 48px; height: 48px; }
.brand-bt .bt-name { display: block; font-size: 22px; font-weight: 800; letter-spacing: -0.01em; line-height: 1.05; }
.brand-bt .bt-name span { color: var(--emeraude-fonce); }
.brand-bt .bt-by { display: block; font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--gris); margin-top: 3px; }
@media (max-width: 420px) { .brand-bt .bt-name { font-size: 19px; } .brand-bt .bt-by { font-size: 10.5px; } }

/* Hero : grande photo + vignettes */
.hero-media img.main { aspect-ratio: 4 / 3.6; }
.hero-thumbs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 10px; }
.hero-thumbs img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: 4px; }
@media (max-width: 860px) { .hero-media img.main { aspect-ratio: 16 / 11; } }

/* Rangées texte + figure (fonctionnement) */
.rows { display: grid; gap: 0; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 5vw, 72px); align-items: center; padding: clamp(36px, 5vw, 64px) 0; border-top: 1px solid var(--filet); }
.row:last-child { border-bottom: 1px solid var(--filet); }
.row.flip > :first-child { order: 2; }
.row h3 { font-size: clamp(24px, 2.4vw, 30px); font-weight: 800; letter-spacing: -0.01em; margin-bottom: 16px; }
.row p { color: var(--gris); font-size: 17px; }
.row .sub { font-size: 13px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; color: var(--emeraude-fonce); margin-bottom: 8px; display: flex; align-items: center; gap: 12px; }
.row .sub svg { width: 40px; height: 20px; color: var(--emeraude); }
@media (max-width: 860px) { .row { grid-template-columns: 1fr; } .row.flip > :first-child { order: 0; } }

/* Schémas : image entière sur fond blanc, cliquable pour agrandir */
.figure { margin: 0; }
.figure a { display: block; background: #fff; border: 1px solid var(--filet); border-radius: var(--radius); padding: clamp(10px, 2vw, 22px); cursor: zoom-in; }
.figure img { width: 100%; height: auto; margin: 0 auto; }
.figure figcaption { font-size: 14px; color: var(--gris); margin-top: 10px; }
.figure.narrow img { max-height: 560px; width: auto; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.pair .figure a { padding: 10px; }
.pair img { max-height: 520px; width: auto; max-width: 100%; }

/* Comparatif (transition énergétique) */
.duo { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(20px, 3vw, 36px); }
.duo h3 { font-size: 20px; margin-bottom: 14px; }
@media (max-width: 860px) { .duo { grid-template-columns: 1fr; } }

/* Bénéfices numérotés */
.benefits { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 2px; background: var(--filet); border: 2px solid var(--filet); border-radius: var(--radius); overflow: hidden; counter-reset: b; }
.benefits li { background: #fff; padding: 28px 30px 30px 84px; position: relative; counter-increment: b; }
.benefits li::before { content: counter(b, decimal-leading-zero); position: absolute; left: 28px; top: 26px; font-size: 22px; font-weight: 800; color: var(--emeraude-fonce); }
.benefits strong { display: block; font-size: 19px; line-height: 1.3; margin-bottom: 8px; }
.benefits p { margin: 0; color: var(--gris); font-size: 16.5px; }
@media (max-width: 760px) { .benefits { grid-template-columns: 1fr; } .benefits li { padding: 24px 22px 26px 70px; } .benefits li::before { left: 22px; top: 23px; } }

/* Services écosystémiques */
.eco { background: var(--brume); }
.eco-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: clamp(36px, 6vw, 88px); align-items: center; }
.eco-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.eco-list li { display: grid; grid-template-columns: 48px 1fr; gap: 16px; align-items: center; padding: 16px 0; border-bottom: 1px solid var(--filet); }
.eco-list li:first-child { border-top: 1px solid var(--filet); }
.eco-list .ic { width: 48px; height: 48px; border-radius: 50%; background: #fff; display: grid; place-items: center; color: var(--emeraude-fonce); }
.eco-list .ic svg { width: 22px; height: 22px; }
.eco-list strong { display: block; font-size: 18px; line-height: 1.3; }
.eco-list span span { color: var(--gris); font-size: 15.5px; }
@media (max-width: 860px) { .eco-grid { grid-template-columns: 1fr; } }

/* Brevet et licence (fond émeraude foncé) */
.patent-facts { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.patent-facts li { padding: 18px 0; border-top: 1px solid rgba(255,255,255,.28); }
.patent-facts li:last-child { border-bottom: 1px solid rgba(255,255,255,.28); }
.patent-facts small { display: block; font-size: 12.5px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; color: rgba(255,255,255,.8); margin-bottom: 4px; }
.patent-facts b { font-size: 18px; }
.territories { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; padding: 0; list-style: none; }
.territories li { background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.3); padding: 5px 12px; border-radius: 999px; font-weight: 700; font-size: 14px; }
.biothermal p { color: rgba(255,255,255,.92); }

/* Galerie de réalisations */
.gallery { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.gallery figure { margin: 0; }
.gallery a { display: block; border-radius: var(--radius); overflow: hidden; cursor: zoom-in; }
.gallery img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; transition: transform .4s ease; }
.gallery a:hover img { transform: scale(1.03); }
.gallery figcaption { font-size: 14px; color: var(--gris); margin-top: 8px; line-height: 1.4; }
.gallery .wide { grid-column: span 2; }
.gallery .wide img { aspect-ratio: 16 / 9.1; }
@media (max-width: 860px) { .gallery { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .gallery .wide { grid-column: span 2; } }

/* Actualités : affiches, flyers et photos tels quels */
.news { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(20px, 3vw, 32px); }
.news-item { display: flex; flex-direction: column; border: 1px solid var(--filet); border-radius: var(--radius); overflow: hidden; background: #fff; }
.news-item > a { display: block; background: var(--brume); cursor: zoom-in; }
.news-item img { width: 100%; aspect-ratio: 4 / 3.4; object-fit: contain; padding: 14px; }
.news-item img.cover { object-fit: cover; padding: 0; }
.news-body { padding: 20px 22px 24px; }
.news-date { font-size: 13px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: var(--emeraude-fonce); margin-bottom: 8px; }
.news-body h3 { font-size: 19px; margin-bottom: 8px; }
.news-body p { margin: 0; color: var(--gris); font-size: 16px; }
@media (max-width: 960px) { .news { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .news { grid-template-columns: 1fr; } }

/* Lien vers Impact Biosystem */
.ib-link { display: grid; grid-template-columns: 64px 1fr; gap: 20px; align-items: center; margin-top: 36px; padding: 22px 24px; border-radius: var(--radius); background: var(--brume); text-decoration: none; color: var(--noir); }
.ib-link img { width: 64px; height: 64px; }
.ib-link small { display: block; font-size: 13px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: var(--emeraude-fonce); }
.ib-link b { font-size: 18px; }
.ib-link:hover { background: var(--filet); color: var(--noir); }

/* Visionneuse d'images (agrandissement des schémas, affiches et photos) */
.viewer { border: 0; padding: 0; background: transparent; max-width: 96vw; max-height: 94vh; }
.viewer::backdrop { background: rgba(20,24,23,.88); }
.viewer img { max-width: 96vw; max-height: 86vh; width: auto; height: auto; background: #fff; border-radius: 4px; margin: 0 auto; }
.viewer p { color: #fff; text-align: center; font-size: 15px; margin: 10px 0 0; }
.viewer button { position: fixed; top: 14px; right: 14px; width: 48px; height: 48px; border-radius: 50%; border: 0; background: #fff; color: var(--noir); font-size: 26px; line-height: 1; cursor: pointer; }
@media (max-width: 480px) {
  .header-inner { gap: 8px; }
  .brand-bt { gap: 9px; }
  .lang-btn { padding: 0 10px; gap: 5px; }
  .nav-toggle { width: 44px; padding: 10px; }
}
#licence h2 { font-size: clamp(30px, 3.4vw, 44px); }


/* ==========================================================================
   Identité BioThermal HP (bleu) | ImpactGreening (vert)
   ========================================================================== */
.brand-logos { display: flex; align-items: center; gap: 14px; flex: none; text-decoration: none; }
.brand-logos img { height: 30px; width: auto; }
.brand-logos .sep { width: 1px; height: 30px; background: var(--noir); }
.brand-logos .ig { display: inline-flex; }
@media (max-width: 1180px) { .brand-logos img { height: 26px; } .brand-logos .sep { height: 26px; } .nav-links { gap: 20px; } }
@media (max-width: 680px) { .brand-logos .sep, .brand-logos .ig { display: none; } }
@media (max-width: 380px) { .brand-logos img { height: 22px; } }

/* Titre principal dessiné comme le logo : BIO léger, THERMAL HP gras, capitales */
.hero h1.logo-title { display: flex; align-items: center; gap: .32em; white-space: nowrap; font-size: clamp(30px, 4.8vw, 64px); text-transform: uppercase; letter-spacing: 0; line-height: 1; margin-bottom: 24px; }
.logo-title img { width: 1.05em; height: 1.05em; flex: none; }
.logo-title .w-light { font-weight: 300; }
.logo-title .w-bold { font-weight: 800; }
.hero .tagline { font-size: clamp(21px, 2.1vw, 27px); font-weight: 700; line-height: 1.3; color: var(--emeraude-fonce); margin: 0 0 22px; text-wrap: balance; }
.hero .badge { display: inline-block; background: var(--emeraude-fonce); color: #fff; font-size: 13px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; padding: 5px 10px; margin-bottom: 22px; }
@media (max-width: 860px) { .hero h1.logo-title { font-size: clamp(28px, 8.4vw, 56px); } }

/* Figures pleine largeur et lisibles */
.figure-wide { max-width: 1100px; margin: 0 auto; }
.figure-wide h3 { font-size: 22px; margin-bottom: 14px; }
.stack { display: grid; gap: clamp(40px, 6vw, 72px); }
.stack .figure-mid { max-width: 860px; }

/* Pied de page */
.footer-grid img.footer-logo { width: 240px; max-width: 100%; }

/* Contact : deux publics */
.contact-list small em { font-style: normal; text-transform: none; letter-spacing: 0; font-weight: 600; }

/* Boutons email (adresses masquées, message pré-rempli selon le public) */
.mail-buttons { display: grid; gap: 12px; margin-bottom: 2px; }
.mail-btn { display: grid; grid-template-columns: 48px 1fr auto; gap: 16px; align-items: center; padding: 20px 24px; border-radius: var(--radius); text-decoration: none; color: #fff; background: var(--emeraude-fonce); border: 2px solid var(--emeraude-fonce); cursor: pointer; font: inherit; text-align: left; width: 100%; }
.mail-btn:hover { background: var(--emeraude-nuit); border-color: var(--emeraude-nuit); color: #fff; }
.mail-btn.ig { background: var(--vert-fonce); border-color: var(--vert-fonce); }
.mail-btn.ig:hover { background: #00594A; border-color: #00594A; }
.mail-btn .ic { width: 48px; height: 48px; border-radius: 50%; background: rgba(255,255,255,.16); display: grid; place-items: center; }
.mail-btn .ic svg, .mail-btn .go { width: 22px; height: 22px; }
.mail-btn small { display: block; font-size: 13px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; opacity: .9; }
.mail-btn b { font-size: 19px; font-weight: 700; }
.contact-list .ic.ig-ic { color: var(--vert-fonce); }
.contact-list .mail-btn small { color: rgba(255,255,255,.92); }
.contact-list .mail-btn .ic { background: rgba(255,255,255,.18); color: #fff; }
.contact-list .mail-btn b { color: #fff; }
.contact-list li > .mail-btn { border-radius: 0; }
@media (max-width: 420px) { .mail-btn { grid-template-columns: 40px 1fr auto; gap: 12px; padding: 18px 16px; } .mail-btn .ic { width: 40px; height: 40px; } }

/* Carrousel de l’accueil (5 photos de toitures) */
.carousel { position: relative; border-radius: var(--radius); overflow: hidden; background: var(--brume); }
.carousel .slides { position: relative; aspect-ratio: 1 / 1; max-width: 100%; }
.carousel .slide { position: absolute; inset: 0; opacity: 0; visibility: hidden; transition: opacity .8s ease, visibility 0s linear .8s; }
.carousel .slide.is-active { opacity: 1; visibility: visible; transition: opacity .8s ease; }
.carousel .slide img { width: 100%; height: 100%; object-fit: cover; border-radius: 0; aspect-ratio: auto; }
.car-btn { position: absolute; top: 50%; transform: translateY(-50%); width: 44px; height: 44px; border-radius: 50%; border: 0; background: rgba(255,255,255,.88); color: var(--noir); display: grid; place-items: center; cursor: pointer; box-shadow: 0 4px 14px rgba(0,0,0,.18); }
.car-btn:hover { background: #fff; color: var(--emeraude-fonce); }
.car-btn svg { width: 20px; height: 20px; }
.car-prev { left: 12px; } .car-prev svg { transform: rotate(180deg); }
.car-next { right: 12px; }
.car-dots { position: absolute; left: 0; right: 0; bottom: 12px; display: flex; justify-content: center; gap: 8px; }
.car-dots button { width: 11px; height: 11px; border-radius: 50%; border: 2px solid #fff; background: rgba(255,255,255,.35); padding: 0; cursor: pointer; box-shadow: 0 1px 4px rgba(0,0,0,.3); }
.car-dots button[aria-current="true"] { background: #fff; }
@media (max-width: 860px) { .carousel .slides { aspect-ratio: 16 / 11; } }
@media (prefers-reduced-motion: reduce) { .carousel .slide, .carousel .slide.is-active { transition: none; } }