/* Layout : héros photo plein cadre avec titre sur dégradé marine, bandeau de chiffres flottant, sections aérées alternant clair et marine, galerie en mosaïque */
:root {
  --navy: #0D2742;      /* « BEI » du logo */
  --navy-2: #133556;
  --blue: #1E78DC;      /* vague du logo */
  --sky: #5BB0F6;
  --steel: #5F6D79;     /* gris de l'arc */
  --bg: #F5F8FB;
  --surface: #FFFFFF;
  --ink: #0F1E2C;
  --muted: #586776;
  --line: #DCE4EC;
  --tint: #E8F1FB;
  --on-dark: #FFFFFF;
  --on-dark-muted: #B4C6D8;
  --plan-bg: #F2F7FD;
  --plan-line: #1E78DC;
  --plan-soft: #9DBFE6;
  --f-display: "Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --f-body: "Figtree", "Segoe UI", system-ui, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
  --radius: 18px;
  --shadow: 0 1px 2px rgba(13,39,66,.06), 0 12px 32px -12px rgba(13,39,66,.18);
  --gutter: clamp(16px, 5vw, 64px);
  --maxw: 1240px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0A1724; --surface: #10233A; --ink: #E8F0F8; --muted: #9DB0C3; --line: #1F3550; --tint: #132C47;
    --blue: #4A9BF0; --plan-bg: #0E2236; --plan-line: #6DB6F7; --plan-soft: #33597F;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 12px 32px -12px rgba(0,0,0,.6); color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0A1724; --surface: #10233A; --ink: #E8F0F8; --muted: #9DB0C3; --line: #1F3550; --tint: #132C47;
  --blue: #4A9BF0; --plan-bg: #0E2236; --plan-line: #6DB6F7; --plan-soft: #33597F;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 12px 32px -12px rgba(0,0,0,.6); color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 1.0625rem/1.65 var(--f-body); -webkit-font-smoothing: antialiased; }
img, svg { max-width: 100%; display: block; }
a { color: inherit; }
:focus-visible { outline: 3px solid var(--sky); outline-offset: 3px; border-radius: 6px; }
h1, h2, h3 { font-family: var(--f-display); margin: 0; text-wrap: balance; letter-spacing: -.02em; }
h1 { font-size: clamp(2.6rem, 6.4vw, 5.2rem); line-height: .98; font-weight: 750; }
h2 { font-size: clamp(2rem, 4vw, 3.1rem); line-height: 1.04; font-weight: 720; }
h3 { font-size: 1.3rem; line-height: 1.2; font-weight: 680; }
p { margin: 0; }
.wrap { max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
.eyebrow { display: inline-flex; align-items: center; gap: .6rem; font: 500 .78rem/1 var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--blue); }
.eyebrow::before { content: ""; width: 28px; height: 2px; background: currentColor; border-radius: 2px; }
.btn { display: inline-flex; align-items: center; gap: .55rem; padding: .95rem 1.5rem; border-radius: 999px; font: 600 1rem/1 var(--f-body); text-decoration: none; border: 1.5px solid transparent; cursor: pointer; transition: transform .25s ease, background-color .25s ease, box-shadow .25s ease; }
.btn svg { width: 18px; height: 18px; transition: transform .25s ease; }
.btn:hover svg { transform: translateX(3px); }
.btn-primary { background: var(--blue); color: #FFFFFF; box-shadow: 0 10px 24px -10px rgba(30,120,220,.8); }
.btn-primary:hover { transform: translateY(-2px); }
.btn-ghost { color: var(--on-dark); border-color: rgba(255,255,255,.45); background: rgba(255,255,255,.06); backdrop-filter: blur(6px); }
.btn-ghost:hover { background: rgba(255,255,255,.16); }

/* En-tête */
.top { position: fixed; inset: 0 0 auto 0; z-index: 50; padding-top: env(safe-area-inset-top, 0px); transition: background-color .3s ease, box-shadow .3s ease; }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-block: .9rem; }
.top.scrolled { background: color-mix(in srgb, var(--surface) 88%, transparent); backdrop-filter: blur(14px); box-shadow: 0 1px 0 var(--line); }
.brand { display: block; background: #FFFFFF; border-radius: 12px; padding: 5px 9px; box-shadow: 0 6px 18px -8px rgba(13,39,66,.45); }
.brand img { height: 46px; width: auto; }
.nav { display: flex; align-items: center; gap: .3rem; }
.nav a { text-decoration: none; font-weight: 600; font-size: .98rem; padding: .55rem .9rem; border-radius: 999px; color: var(--on-dark); transition: background-color .2s ease; }
.nav a:hover { background: rgba(255,255,255,.14); }
.top.scrolled .nav a { color: var(--ink); }
.top.scrolled .nav a:hover { background: var(--tint); }
.nav a.nav-cta, .top.scrolled .nav a.nav-cta { background: var(--blue); color: #FFFFFF; }

/* Héros */
.hero { position: relative; isolation: isolate; color: var(--on-dark); background: var(--navy); overflow: hidden; }
.hero-slides { position: absolute; inset: 0; z-index: -2; }
.hero-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 70% 40%; opacity: 0; transform: scale(1.08); transition: opacity 1.4s ease, transform 7.5s ease-out; }
.hero-img.on { opacity: 1; transform: scale(1); }
.hero-ctrl { position: absolute; right: var(--gutter); bottom: 6.2rem; display: flex; align-items: center; gap: 1rem; z-index: 1; }
.hero-cap { font: 500 .78rem/1.2 var(--f-mono); letter-spacing: .04em; color: var(--on-dark); background: rgba(13,39,66,.55); backdrop-filter: blur(6px); padding: .5rem .8rem; border-radius: 999px; }
.hero-dots { display: flex; gap: .45rem; }
.hero-dot { width: 10px; height: 10px; padding: 0; border-radius: 999px; border: 0; background: rgba(255,255,255,.45); cursor: pointer; transition: width .35s ease, background-color .35s ease; }
.hero-dot.on { width: 28px; background: var(--sky); }
.hero::before { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(100deg, rgba(13,39,66,.96) 0%, rgba(13,39,66,.86) 38%, rgba(13,39,66,.35) 72%, rgba(13,39,66,.15) 100%); }
.hero .wrap { padding-block: clamp(8.5rem, 16vw, 11rem) clamp(7rem, 12vw, 9rem); display: grid; gap: 1.6rem; }
.hero .eyebrow { color: var(--sky); }
.hero h1 { max-width: 14ch; }
.h1-kicker { display: block; font: 600 clamp(1rem, 1.8vw, 1.3rem)/1.3 var(--f-body); letter-spacing: 0; color: var(--on-dark); margin-bottom: .6rem; }
.hero h1 em { font-style: normal; color: var(--sky); }
.hero .lead { max-width: 52ch; font-size: clamp(1.05rem, 1.6vw, 1.25rem); color: var(--on-dark-muted); }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; padding-top: .4rem; }
.rise { animation: rise .9s cubic-bezier(.2,.7,.2,1) both; }
.rise.d1 { animation-delay: .08s; } .rise.d2 { animation-delay: .16s; } .rise.d3 { animation-delay: .24s; }
@keyframes rise { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }
@keyframes zoom { from { transform: scale(1.08); } to { transform: scale(1); } }

/* Chiffres */
.stats { position: relative; z-index: 2; margin-top: -4.5rem; }
.stats-card { display: grid; grid-template-columns: repeat(4, 1fr); background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow); border: 1px solid var(--line); }
.stat { padding: 1.6rem 1.6rem; display: grid; gap: .25rem; }
.stat b .count { font: inherit; color: inherit; font-variant-numeric: tabular-nums; }
.stat + .stat { border-left: 1px solid var(--line); }
.stat b { font: 720 clamp(1.4rem, 2.4vw, 1.9rem)/1.1 var(--f-display); letter-spacing: -.02em; }
.stat span { color: var(--muted); font-size: .95rem; }

/* Sections */
section.sec { padding-block: clamp(4.5rem, 10vw, 8rem); }
.sec-head { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem 4rem; align-items: end; margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.sec-head > div { display: grid; gap: 1rem; min-width: 0; }
.sec-head p { color: var(--muted); max-width: 54ch; }

/* Services */
.services { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.svc { position: relative; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.9rem 1.7rem; display: grid; gap: .8rem; align-content: start; transition: transform .35s ease, box-shadow .35s ease, border-color .35s ease; overflow: hidden; }
.svc::after { content: ""; position: absolute; inset: auto 0 0 0; height: 3px; background: linear-gradient(90deg, var(--blue), var(--sky)); transform: scaleX(0); transform-origin: left; transition: transform .45s ease; }
.svc:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: transparent; }
.svc:hover::after { transform: scaleX(1); }
.svc-top { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.svc-ico { width: 52px; height: 52px; border-radius: 14px; background: var(--tint); color: var(--blue); display: grid; place-items: center; }
.svc-ico svg { width: 28px; height: 28px; }
.norm { font: 500 .74rem/1 var(--f-mono); color: var(--muted); letter-spacing: .06em; border: 1px solid var(--line); border-radius: 999px; padding: .45rem .7rem; }
.svc p { color: var(--muted); font-size: 1rem; }
.svc ul { list-style: none; margin: .2rem 0 0; padding: 0; display: grid; gap: .35rem; font-size: .95rem; }
.svc li { display: flex; gap: .55rem; align-items: baseline; }
.svc li::before { content: ""; flex: none; width: 6px; height: 6px; border-radius: 50%; background: var(--blue); transform: translateY(-2px); }

/* Méthode (bloc marine) */
.dark { background: var(--navy); color: var(--on-dark); position: relative; overflow: hidden; }
.dark::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(91,176,246,.07) 1px, transparent 1px), linear-gradient(90deg, rgba(91,176,246,.07) 1px, transparent 1px); background-size: 48px 48px; mask-image: radial-gradient(ellipse at 80% 20%, #000 0%, transparent 70%); -webkit-mask-image: radial-gradient(ellipse at 80% 20%, #000 0%, transparent 70%); pointer-events: none; }
.dark .wrap { position: relative; }
.dark .eyebrow { color: var(--sky); }
.dark .sec-head p { color: var(--on-dark-muted); }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; counter-reset: step; }
.step { position: relative; padding: 1.8rem 1.5rem; border-radius: var(--radius); background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.1); display: grid; gap: .7rem; align-content: start; }
.step::before { counter-increment: step; content: "0" counter(step); font: 700 2.6rem/1 var(--f-display); color: transparent; -webkit-text-stroke: 1.2px var(--sky); letter-spacing: -.02em; }
.step p { color: var(--on-dark-muted); font-size: .98rem; }

/* Références */
.gallery { display: grid; grid-template-columns: repeat(12, 1fr); gap: 1.25rem; }
.ref { grid-column: span 4; position: relative; border-radius: var(--radius); overflow: hidden; background: var(--surface); border: 1px solid var(--line); display: grid; grid-template-rows: auto 1fr; transition: transform .35s ease, box-shadow .35s ease; }
.ref:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.ref.wide { grid-column: span 8; }
.ref.half { grid-column: span 6; }
.ref-media { position: relative; display: block; width: 100%; padding: 0; border: 0; cursor: zoom-in; aspect-ratio: 4 / 3; max-width: 100%; background: var(--plan-bg); overflow: hidden; }
.ref.wide .ref-media { aspect-ratio: 16 / 9; }
.ref.half .ref-media { aspect-ratio: 16 / 9; }
.ref-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .7s ease; }
.ref.is-plan .ref-media { background: #FFFFFF; }
.ref-media img[src*="pavee-rendu"] { background: #000000; }
.ref.is-plan .ref-media img { object-fit: contain; padding: 1rem; }
.ref:hover .ref-media img { transform: scale(1.04); }
.tag { position: absolute; left: 1rem; top: 1rem; font: 500 .72rem/1 var(--f-mono); letter-spacing: .06em; text-transform: uppercase; background: var(--surface); color: var(--ink); padding: .5rem .7rem; border-radius: 999px; box-shadow: 0 4px 14px -6px rgba(13,39,66,.4); }
.kind { position: absolute; right: 1rem; bottom: 1rem; font: 500 .7rem/1 var(--f-mono); letter-spacing: .06em; text-transform: uppercase; background: var(--navy); color: #FFFFFF; padding: .45rem .65rem; border-radius: 999px; }
.ref-body { padding: 1.4rem 1.5rem 1.6rem; display: grid; gap: .5rem; align-content: start; }
.ref-meta { display: flex; flex-wrap: wrap; gap: .4rem .9rem; font: 500 .8rem/1.3 var(--f-mono); color: var(--muted); }
.ref-body p { color: var(--muted); font-size: .98rem; }
.ref-loc { display: flex; gap: .45rem; align-items: flex-start; margin-top: .6rem; font: 500 .85rem/1.45 var(--f-mono); color: var(--ink); }
.ref-loc svg { flex: none; margin-top: .15rem; color: var(--blue, #1E78DC); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.thumbs { display: flex; flex-wrap: wrap; gap: .5rem; padding-top: .4rem; }
.gallery > .ref { min-width: 0; }
.thumb { width: 64px; height: 48px; padding: 0; border: 1.5px solid var(--line); border-radius: 8px; overflow: hidden; cursor: zoom-in; background: var(--plan-bg); transition: border-color .2s ease, transform .2s ease; }
.thumb:hover { border-color: var(--blue); transform: translateY(-2px); }
.thumb img { width: 100%; height: 100%; object-fit: cover; }
.lightbox { border: 0; padding: 0; background: transparent; max-width: min(1200px, 94vw); max-height: 92vh; }
.lightbox::backdrop { background: rgba(6,18,31,.88); backdrop-filter: blur(4px); }
.lightbox figure { margin: 0; display: grid; gap: .8rem; }
.lightbox img { max-width: 100%; max-height: 80vh; width: auto; margin-inline: auto; border-radius: 12px; background: #FFFFFF; }
.lightbox figcaption { color: #FFFFFF; text-align: center; font-size: .95rem; }
.lb-close { position: fixed; top: calc(env(safe-area-inset-top, 0px) + 16px); right: 16px; width: 44px; height: 44px; border-radius: 50%; border: 0; background: #FFFFFF; color: var(--navy); font: 600 1.4rem/1 var(--f-body); cursor: pointer; }

/* Clients */
.clients-head { display: flex; justify-content: center; margin-bottom: 1.6rem; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.marquee { overflow: hidden; -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.client-row { list-style: none; margin: 0; padding: .4rem 0; display: flex; gap: 1rem; width: max-content; animation: slide 40s linear infinite; }
.marquee:hover .client-row { animation-play-state: paused; }
.client-row .client { flex: 0 0 190px; max-width: none; }
@keyframes slide { to { transform: translateX(calc(-50% - .5rem)); } }

/* Bande défilante de projets */
.film { overflow: hidden; padding-block: 3rem 0; -webkit-mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent); mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent); }
.film-track { display: flex; gap: 1rem; width: max-content; animation: slide 70s linear infinite; }
.film:hover .film-track { animation-play-state: paused; }
.film-item { position: relative; flex: none; width: 300px; aspect-ratio: 4 / 3; max-width: 70vw; padding: 0; border: 1px solid var(--line); border-radius: 16px; overflow: hidden; background: #FFFFFF; cursor: zoom-in; }
.film-item img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s ease; }
.film-item:hover img { transform: scale(1.06); }
.film-item span { position: absolute; left: .6rem; right: .6rem; bottom: .6rem; font: 500 .72rem/1.3 var(--f-mono); color: #FFFFFF; background: rgba(13,39,66,.78); padding: .4rem .6rem; border-radius: 8px; text-align: left; opacity: 0; transform: translateY(6px); transition: opacity .3s ease, transform .3s ease; }
.film-item:hover span, .film-item:focus-visible span { opacity: 1; transform: none; }
.client { display: grid; place-items: center; text-align: center; gap: .35rem; flex: 1 1 140px; max-width: 260px; min-height: 96px; padding: 1.1rem; border-radius: var(--radius); background: #FFFFFF; border: 1px solid var(--line); transition: border-color .25s ease, transform .25s ease; min-width: 0; }
.client:hover { border-color: var(--blue); transform: translateY(-3px); }
.client-name { font: 700 1.05rem/1.15 var(--f-display); letter-spacing: -.01em; color: #5F6D79; }
.client img { max-height: 44px; max-width: 100%; width: auto; height: auto; mix-blend-mode: multiply; filter: grayscale(1); opacity: .8; transition: filter .25s ease, opacity .25s ease; }
.client:hover img { filter: none; opacity: 1; }
.client img.faint { filter: grayscale(1) brightness(.55); }
.client:hover img.faint { filter: none; }
.logo-pair { display: flex; align-items: center; justify-content: center; gap: .7rem; min-width: 0; }
.logo-pair img { max-height: 30px; min-width: 0; }
.client small { color: var(--muted); font-size: .8rem; line-height: 1.3; }

.partner { margin-top: 1.5rem; display: grid; grid-template-columns: 1fr; gap: 1.5rem 3rem; align-items: center; padding: clamp(1.4rem, 3vw, 2.2rem); border-radius: var(--radius); background: var(--tint); }
.partner p { color: var(--muted); margin-top: .7rem; }
.partner-list { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: .6rem; }
.partner-list li { background: var(--surface); border: 1px solid var(--line); border-radius: 999px; padding: .55rem .95rem; font-size: .93rem; }
.partner-list span { color: var(--muted); margin-left: .35rem; }

/* Appel à l'action */
.cta-band { background: linear-gradient(120deg, var(--blue), #0F5DB5 60%, var(--navy)); color: #FFFFFF; border-radius: calc(var(--radius) + 6px); padding: clamp(2rem, 5vw, 3.5rem); display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1.5rem 2rem; position: relative; overflow: hidden; }
.cta-band::after { content: ""; position: absolute; right: -60px; bottom: -120px; width: 360px; height: 360px; border-radius: 50%; border: 1.5px solid rgba(255,255,255,.18); box-shadow: 0 0 0 40px rgba(255,255,255,.04), 0 0 0 80px rgba(255,255,255,.03); pointer-events: none; }
.cta-band h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); max-width: 22ch; }
.cta-band p { color: #D6E7FA; margin-top: .5rem; }
.btn-light { background: #FFFFFF; color: var(--navy); position: relative; z-index: 1; }
.btn-light:hover { transform: translateY(-2px); }

/* Contact */
.contact-grid { display: grid; grid-template-columns: .9fr 1.3fr; gap: clamp(2rem, 5vw, 4.5rem); align-items: start; }
.coords { display: grid; gap: 1rem; }
.coord { display: flex; gap: 1rem; align-items: center; padding: 1rem 1.1rem; border-radius: 14px; background: var(--surface); border: 1px solid var(--line); min-width: 0; }
.coord .svc-ico { width: 44px; height: 44px; border-radius: 12px; flex: none; }
.coord .svc-ico svg { width: 22px; height: 22px; }
.coord small { display: block; color: var(--muted); font-size: .85rem; }
.coord strong, .coord a { font-weight: 600; text-decoration: none; overflow-wrap: anywhere; }
.coord a:hover { color: var(--blue); }
form { display: grid; grid-template-columns: 1fr 1fr; gap: 1.1rem; background: var(--surface); border-radius: calc(var(--radius) + 4px); padding: clamp(1.4rem, 3.5vw, 2.4rem); box-shadow: var(--shadow); border: 1px solid var(--line); }
.field { display: grid; gap: .4rem; min-width: 0; }
.full { grid-column: 1 / -1; }
label { font-weight: 600; font-size: .92rem; }
input, select, textarea { font: inherit; font-size: 1rem; color: var(--ink); background: var(--bg); border: 1.5px solid var(--line); border-radius: 12px; padding: .8rem .95rem; width: 100%; transition: border-color .2s ease, box-shadow .2s ease; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 4px color-mix(in srgb, var(--blue) 18%, transparent); }
textarea { min-height: 150px; resize: vertical; }
.consent { display: flex; gap: .7rem; align-items: start; font-weight: 400; color: var(--muted); font-size: .9rem; }
.consent input { width: 18px; height: 18px; margin-top: .2rem; flex: none; accent-color: var(--blue); }
.form-status { color: #C0392B; font-size: .95rem; }
.form-status:empty { display: none; }

/* Pied de page et mentions */
footer { background: var(--navy); color: var(--on-dark-muted); }
footer .wrap { padding-block: 3rem 2rem; display: grid; gap: 2rem; }
.foot-top { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1.5rem; align-items: center; }
.foot-top .brand { box-shadow: none; }
.foot-links { display: flex; flex-wrap: wrap; gap: .4rem 1.4rem; }
.foot-links a { color: var(--on-dark); text-decoration: none; font-weight: 500; }
.foot-links a:hover { color: var(--sky); }
details.legal { border-top: 1px solid rgba(255,255,255,.12); padding-top: 1.5rem; }
details.legal summary { cursor: pointer; color: var(--on-dark); font-weight: 600; list-style: none; display: flex; align-items: center; gap: .5rem; }
details.legal summary::-webkit-details-marker { display: none; }
details.legal summary::after { content: "+"; font: 500 1.2rem/1 var(--f-mono); color: var(--sky); }
details.legal[open] summary::after { content: "−"; }
.legal-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; padding-top: 1.5rem; font-size: .93rem; }
.legal-grid h3 { font-size: 1rem; color: var(--on-dark); margin-bottom: .5rem; letter-spacing: 0; }
.legal-grid > div { min-width: 0; display: grid; gap: .3rem; align-content: start; }
.copy { font-size: .88rem; }

/* Apparition au défilement : le contenu reste visible sans script */
.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity .8s ease, transform .8s cubic-bezier(.2,.7,.2,1); }
.js .reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
  .hero-img { transition: none; }
  .client-row { flex-wrap: wrap; justify-content: center; width: auto; }
  .client-row [aria-hidden="true"], .film-track [aria-hidden="true"] { display: none; }
  .film { overflow-x: auto; }
}

@media (max-width: 1000px) {
  .services { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .ref, .ref.wide, .ref.half { grid-column: span 6; }
  .ref.wide .ref-media, .ref.half .ref-media { aspect-ratio: 4 / 3; }
  .sec-head, .contact-grid { grid-template-columns: 1fr; }
  .stats-card { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(3) { border-left: 0; }
  .stat:nth-child(n+3) { border-top: 1px solid var(--line); }
  .legal-grid { grid-template-columns: 1fr; }
  .partner { grid-template-columns: 1fr; }
}
@media (max-width: 680px) {
  .hero::before { background: linear-gradient(180deg, rgba(13,39,66,.82) 0%, rgba(13,39,66,.9) 60%, rgba(13,39,66,.75) 100%); }
  .brand img { height: 38px; }
  .services, .steps, form { grid-template-columns: 1fr; }
  .ref, .ref.wide, .ref.half { grid-column: 1 / -1; }
  .stat { padding: 1.2rem; }
  .hero-ctrl { bottom: 5.6rem; }
  .hero-cap { display: none; }
  .film-item { width: 220px; }
  .client { flex-basis: 140px; }
}

/* ===== Multi-pages : transitions, menu, en-têtes de page ===== */
@view-transition { navigation: auto; }
::view-transition-old(root) { animation: vt-out .32s ease both; }
::view-transition-new(root) { animation: vt-in .55s cubic-bezier(.2,.7,.2,1) both; }
::view-transition-group(entete) { animation-duration: 0s; }
.top { view-transition-name: entete; }
@keyframes vt-out { to { opacity: 0; transform: translateY(-14px); } }
@keyframes vt-in { from { opacity: 0; transform: translateY(22px); } }

.nav a[aria-current="page"] { background: rgba(255,255,255,.16); box-shadow: inset 0 -2px 0 var(--sky); }
.top.scrolled .nav a[aria-current="page"] { background: var(--tint); box-shadow: inset 0 -2px 0 var(--blue); }
.nav a.nav-cta[aria-current="page"] { box-shadow: none; }
.menu-btn { display: none; }

/* En-tête des pages intérieures */
.page-hero { position: relative; isolation: isolate; overflow: hidden; background: var(--navy); color: var(--on-dark); }
.page-hero::before { content: ""; position: absolute; inset: 0; z-index: -1; background-image: linear-gradient(rgba(91,176,246,.09) 1px, transparent 1px), linear-gradient(90deg, rgba(91,176,246,.09) 1px, transparent 1px); background-size: 40px 40px; background-position: 0 calc(var(--p, 0) * 120px); mask-image: radial-gradient(ellipse at 75% 40%, #000 0%, transparent 75%); -webkit-mask-image: radial-gradient(ellipse at 75% 40%, #000 0%, transparent 75%); }
.page-hero .wrap { padding-block: clamp(7.5rem, 13vw, 9.5rem) clamp(3rem, 6vw, 4.5rem); display: grid; grid-template-columns: 1.1fr .9fr; gap: 2rem 3rem; align-items: center; }
.page-hero .wrap > div { display: grid; gap: 1.1rem; min-width: 0; }
.page-hero h1 { font-size: clamp(2.3rem, 5.2vw, 4.2rem); line-height: 1; }
.page-hero h1 em { font-style: normal; color: var(--sky); }
.page-hero .lead { color: var(--on-dark-muted); max-width: 52ch; font-size: clamp(1.02rem, 1.5vw, 1.18rem); }
.page-hero .eyebrow { color: var(--sky); }
.crumbs { font: 500 .78rem/1 var(--f-mono); letter-spacing: .06em; color: var(--on-dark-muted); display: flex; gap: .5rem; flex-wrap: wrap; }
.crumbs a { color: var(--on-dark); text-decoration: none; }
.crumbs a:hover { color: var(--sky); }
.art { width: 100%; max-width: 520px; justify-self: end; color: var(--sky); overflow: visible; }
.art .m { stroke: currentColor; stroke-width: 7; stroke-linecap: round; fill: none; }
.art .m.thin { stroke-width: 3.5; opacity: .75; }
.art .node { fill: var(--navy); stroke: #FFFFFF; stroke-width: 2.5; }
.art .ground { stroke: rgba(255,255,255,.35); stroke-width: 2; stroke-dasharray: 6 8; }
.art .hatch { stroke: rgba(255,255,255,.25); stroke-width: 1.5; }
.art .lbl { font: 500 11px/1 var(--f-mono); fill: var(--on-dark-muted); letter-spacing: .08em; }

/* Poteaux et poutres qui volent puis s'assemblent */
.fly { transform-box: fill-box; transform-origin: center; animation: fly 1.1s cubic-bezier(.18,.85,.25,1.15) both; animation-delay: calc(var(--i, 0) * 110ms + .25s); }
@keyframes fly { from { opacity: 0; transform: translate(var(--dx, 0), var(--dy, -220px)) rotate(var(--r, 0deg)); } 60% { opacity: 1; } to { opacity: 1; transform: none; } }
.art .float { animation: float 6s ease-in-out 2.4s infinite; transform-box: fill-box; transform-origin: center; }
@keyframes float { 50% { transform: translateY(-6px); } }

/* Ferraillage qui se dessine */
.draw { stroke-dasharray: var(--len, 600); stroke-dashoffset: var(--len, 600); animation: draw 1.4s cubic-bezier(.4,.1,.2,1) forwards; animation-delay: calc(var(--i, 0) * 120ms + .3s); }
@keyframes draw { to { stroke-dashoffset: 0; } }
.pop { transform-box: fill-box; transform-origin: center; animation: pop .45s cubic-bezier(.2,.9,.3,1.4) both; animation-delay: calc(var(--i, 0) * 70ms + 1.4s); }
@keyframes pop { from { opacity: 0; transform: scale(0); } }

/* Planchers qui tombent et s'empilent */
.drop { transform-box: fill-box; animation: drop .8s cubic-bezier(.3,1.4,.4,1) both; animation-delay: calc(var(--i, 0) * 180ms + .3s); }
@keyframes drop { from { opacity: 0; transform: translateY(-260px); } 40% { opacity: 1; } }

/* ===== Poutre interactive ===== */
.beam-sec { background: var(--navy); color: var(--on-dark); position: relative; overflow: hidden; }
.beam-sec::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(91,176,246,.07) 1px, transparent 1px), linear-gradient(90deg, rgba(91,176,246,.07) 1px, transparent 1px); background-size: 48px 48px; pointer-events: none; }
.beam-sec .wrap { position: relative; display: grid; grid-template-columns: .8fr 1.2fr; gap: 2rem 3.5rem; align-items: center; }
.beam-sec .eyebrow { color: var(--sky); }
.beam-sec p { color: var(--on-dark-muted); }
.beam-copy { display: grid; gap: 1rem; min-width: 0; }
.beam-box { position: relative; border-radius: var(--radius); background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.12); padding: clamp(.8rem, 2vw, 1.4rem); min-width: 0; }
#beam { width: 100%; height: auto; touch-action: pan-y; cursor: ew-resize; user-select: none; -webkit-user-select: none; }
#beam .axis { stroke: rgba(255,255,255,.22); stroke-width: 1.5; stroke-dasharray: 4 6; }
#beam .bm { fill: none; stroke: #FFFFFF; stroke-width: 10; stroke-linecap: round; stroke-linejoin: round; }
#beam .bm-in { fill: none; stroke: var(--navy); stroke-width: 3; stroke-linecap: round; }
#beam .sup { fill: var(--sky); }
#beam .gnd { stroke: rgba(255,255,255,.4); stroke-width: 2; }
#beam .load { color: var(--sky); }
#beam .load path, #beam .load line { stroke: currentColor; stroke-width: 3.5; fill: none; stroke-linecap: round; stroke-linejoin: round; }
#beam .load circle { fill: currentColor; }
#beam .mom { fill: rgba(91,176,246,.18); stroke: var(--sky); stroke-width: 2; }
#beam .t { font: 500 13px/1 var(--f-mono); fill: var(--on-dark-muted); }
#beam .t.hi { fill: #FFFFFF; font-weight: 600; }
.beam-read { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: .9rem; }
.beam-read span { font: 500 .82rem/1 var(--f-mono); padding: .55rem .8rem; border-radius: 999px; background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.14); color: var(--on-dark); }
.beam-read b { color: var(--sky); font-weight: 600; }
.hint { font: 500 .78rem/1.3 var(--f-mono); color: var(--on-dark-muted); letter-spacing: .04em; }

/* Profilé HEB qui traverse l'écran au défilement */
.girder { overflow: hidden; padding-block: clamp(1.5rem, 4vw, 3rem); pointer-events: none; }
.girder svg { width: 180vw; max-width: none; height: auto; color: var(--steel); transform: translateX(calc(10vw - var(--p, .5) * 90vw)); will-change: transform; }
.girder .gl { stroke: currentColor; stroke-width: 2; fill: none; }
.girder .gf { fill: currentColor; opacity: .14; }
.girder .bolt { fill: var(--blue); }

/* Aperçus (accueil) */
.teasers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.teaser { position: relative; display: grid; grid-template-rows: auto 1fr; border-radius: var(--radius); overflow: hidden; background: var(--surface); border: 1px solid var(--line); text-decoration: none; transition: transform .35s ease, box-shadow .35s ease; min-width: 0; }
.teaser:hover { transform: translateY(-6px) rotate(-.4deg); box-shadow: var(--shadow); }
.teaser .ref-media { cursor: pointer; }
.teaser .ref-media img { transition: transform .8s ease; }
.teaser:hover .ref-media img { transform: scale(1.06); }
.teaser .ref-body { gap: .45rem; }
.more { display: inline-flex; align-items: center; gap: .45rem; font-weight: 600; color: var(--blue); margin-top: .3rem; }
.more svg { width: 16px; height: 16px; transition: transform .25s ease; }
.teaser:hover .more svg, a.more:hover svg { transform: translateX(4px); }
a.more { text-decoration: none; }
.sec-foot { display: flex; justify-content: center; margin-top: 2.2rem; }
.btn-outline { color: var(--ink); border-color: var(--line); background: var(--surface); }
.btn-outline:hover { border-color: var(--blue); color: var(--blue); transform: translateY(-2px); }
.mini-svc { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.mini-svc a { display: flex; gap: 1rem; align-items: center; padding: 1.1rem 1.2rem; border-radius: 16px; background: var(--surface); border: 1px solid var(--line); text-decoration: none; transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease; min-width: 0; }
.mini-svc a:hover { transform: translateY(-4px); border-color: var(--blue); box-shadow: var(--shadow); }
.mini-svc a:hover .svc-ico { transform: rotate(-8deg) scale(1.08); }
.mini-svc .svc-ico { flex: none; transition: transform .35s cubic-bezier(.2,.9,.3,1.4); }
.mini-svc strong { display: block; font: 680 1.08rem/1.2 var(--f-display); }
.mini-svc small { color: var(--muted); font-size: .88rem; }

/* Méthode : ligne de temps qui se remplit au défilement */
.timeline { position: relative; display: grid; gap: 1.25rem; padding-left: 3.2rem; counter-reset: step; }
.timeline::before, .timeline::after { content: ""; position: absolute; left: 1.1rem; top: .4rem; bottom: .4rem; width: 3px; border-radius: 3px; background: rgba(255,255,255,.12); }
.timeline::after { background: linear-gradient(var(--sky), var(--blue)); transform-origin: top; transform: scaleY(var(--p, 1)); }
.timeline .step { grid-template-columns: auto 1fr; column-gap: 1.4rem; align-items: start; }
.timeline .step::before { grid-row: span 2; }
.timeline .step h3, .timeline .step p { grid-column: 2; }
.deliv { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.deliv li { list-style: none; display: flex; gap: .9rem; align-items: flex-start; padding: 1.2rem; border-radius: 16px; background: var(--surface); border: 1px solid var(--line); }
.deliv ul { margin: 0; padding: 0; display: contents; }
.deliv strong { display: block; }
.deliv small { color: var(--muted); }

/* Mentions légales */
.legal-page { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.legal-page > div { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.6rem; display: grid; gap: .5rem; align-content: start; min-width: 0; }
.legal-page h2 { font-size: 1.15rem; letter-spacing: 0; }
.legal-page h3 { font-size: 1.15rem; letter-spacing: 0; color: var(--ink); }
.legal-page p { color: var(--muted); }

footer .foot-links a[aria-current="page"] { color: var(--sky); }

@media (prefers-reduced-motion: reduce) {
  @view-transition { navigation: none; }
  .fly, .drop, .pop { opacity: 1 !important; transform: none !important; }
  .draw { stroke-dashoffset: 0 !important; }
  .girder svg { transform: translateX(-30vw); }
  .timeline::after { transform: none; }
}

@media (max-width: 1000px) {
  .page-hero .wrap, .beam-sec .wrap { grid-template-columns: 1fr; }
  .art { justify-self: center; max-width: 440px; }
  .teasers, .mini-svc, .deliv, .legal-page { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  .jsm .menu-btn { display: inline-grid; place-items: center; width: 46px; height: 46px; padding: 0; border-radius: 999px; border: 1.5px solid rgba(255,255,255,.45); background: rgba(255,255,255,.08); color: var(--on-dark); cursor: pointer; }
  .jsm .menu-btn svg { width: 22px; height: 22px; }
  .jsm .menu-btn .x { display: none; }
  .jsm .top.open .menu-btn .x { display: block; }
  .jsm .top.open .menu-btn .bars { display: none; }
  .jsm .top.scrolled .menu-btn, .jsm .top.open .menu-btn { color: var(--ink); border-color: var(--line); background: var(--surface); }
  .jsm .top.open { background: color-mix(in srgb, var(--surface) 94%, transparent); backdrop-filter: blur(14px); }
  .jsm .top.open .brand { box-shadow: none; }
  .jsm .nav { position: absolute; top: 100%; left: var(--gutter); right: var(--gutter); flex-direction: column; align-items: stretch; gap: .2rem; background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: .6rem; box-shadow: var(--shadow); opacity: 0; visibility: hidden; transform: translateY(-10px); transition: opacity .25s ease, transform .25s ease, visibility 0s .25s; }
  .jsm .top.open .nav { opacity: 1; visibility: visible; transform: none; transition: opacity .25s ease, transform .25s ease; }
  .jsm .nav a, .jsm .top.scrolled .nav a { color: var(--ink); padding: .95rem 1rem; font-size: 1.08rem; border-radius: 12px; }
  .jsm .nav a[aria-current="page"] { background: var(--tint); box-shadow: inset 3px 0 0 var(--blue); }
  .jsm .nav a.nav-cta { color: #FFFFFF; text-align: center; margin-top: .3rem; }
  .nav { flex-wrap: wrap; justify-content: flex-end; }
}
@media (max-width: 680px) {
  .teasers, .mini-svc, .deliv, .legal-page { grid-template-columns: 1fr; }
  .timeline { padding-left: 2.4rem; }
  .timeline::before, .timeline::after { left: .7rem; }
  .timeline .step { grid-template-columns: 1fr; }
  .timeline .step::before { grid-row: auto; }
  .timeline .step h3, .timeline .step p { grid-column: 1; }
  .girder svg { width: 320vw; transform: translateX(calc(10vw - var(--p, .5) * 200vw)); }
}

/* Filtres des références */
.filters { display: none; flex-wrap: wrap; gap: .5rem; align-items: center; margin-bottom: 1.6rem; }
.jsm .filters { display: flex; }
.filter { font: 600 .95rem/1 var(--f-body); padding: .7rem 1.1rem; border-radius: 999px; border: 1.5px solid var(--line); background: var(--surface); color: var(--ink); cursor: pointer; transition: background-color .2s ease, border-color .2s ease, color .2s ease, transform .2s ease; }
.filter:hover { border-color: var(--blue); transform: translateY(-2px); }
.filter[aria-pressed="true"] { background: var(--navy); border-color: var(--navy); color: #FFFFFF; }
#filter-count { margin-left: auto; font: 500 .82rem/1 var(--f-mono); color: var(--muted); }
.gallery > .ref[hidden] { display: none; }
.pop-in { animation: popin .5s cubic-bezier(.2,.8,.3,1.2) both; }
@keyframes popin { from { opacity: 0; transform: translateY(18px) scale(.97); } }
.steps.timeline { grid-template-columns: 1fr; max-width: 820px; }

/* Accueil : poteaux qui volent et poutre qui glisse, assemblés au défilement */
.assemble { overflow: hidden; padding-block: clamp(1rem, 3vw, 2rem); pointer-events: none; --q1: clamp(0, calc(var(--p, 1) * 3.2 - .15), 1); --q2: clamp(0, calc(var(--p, 1) * 3.2 - .3), 1); --q3: clamp(0, calc(var(--p, 1) * 3.2 - .45), 1); --qb: clamp(0, calc(var(--p, 1) * 3.2 - .6), 1); }
.assemble svg { width: min(1200px, 100%); margin-inline: auto; height: auto; overflow: visible; }
.as-fill { fill: var(--navy); }
.as-line { stroke: var(--sky); stroke-width: 2; fill: none; }
.as-plate { fill: var(--steel); }
.as-bolt { fill: var(--sky); }
.as-gnd { stroke: var(--line); stroke-width: 2; stroke-dasharray: 8 10; }
.as-lbl { font: 600 13px/1 var(--f-mono); fill: var(--muted); letter-spacing: .08em; }
.as-col, .as-beam { transform-box: fill-box; transform-origin: center; will-change: transform; }
.as-c1 { transform: translate(calc((1 - var(--q1)) * 1100px), calc((1 - var(--q1)) * -520px)) rotate(calc((1 - var(--q1)) * -300deg)); opacity: calc(.2 + var(--q1)); }
.as-c2 { transform: translate(calc((1 - var(--q2)) * -1000px), calc((1 - var(--q2)) * -420px)) rotate(calc((1 - var(--q2)) * 280deg)); opacity: calc(.2 + var(--q2)); }
.as-c3 { transform: translate(calc((1 - var(--q3)) * 700px), calc((1 - var(--q3)) * -640px)) rotate(calc((1 - var(--q3)) * 400deg)); opacity: calc(.2 + var(--q3)); }
.as-beam { transform: translateX(calc((1 - var(--qb)) * -1400px)); opacity: calc(.2 + var(--qb)); }
@media (prefers-reduced-motion: reduce) { .as-col, .as-beam { transform: none !important; opacity: 1 !important; } }
@media (max-width: 680px) { .assemble svg { width: 130%; max-width: none; margin-left: -15%; } }