:root{--ink:#081a31;--white:#fff;--paper:#f3f6fa;--lime:#5aa7ff;--violet:#215fc7;--action:#1677ff;--line:#d8e0ea;--muted:#5f6875}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:'DM Sans',sans-serif}
a{color:inherit}
@keyframes soft-rise{from{opacity:0;transform:translateY(34px)}to{opacity:1;transform:translateY(0)}}
@keyframes orbit-breathe{0%,100%{transform:scale(1);opacity:.55}50%{transform:scale(1.04);opacity:1}}
@keyframes axis-scan{0%{opacity:.2;transform:scaleX(.25)}50%{opacity:.9;transform:scaleX(1)}100%{opacity:.2;transform:scaleX(.25)}}
@keyframes axis-scan-y{0%{opacity:.2;transform:scaleY(.25)}50%{opacity:.9;transform:scaleY(1)}100%{opacity:.2;transform:scaleY(.25)}}
@keyframes node-pulse{0%,100%{box-shadow:0 0 0 0 rgba(90,167,255,.05)}50%{box-shadow:0 0 0 16px rgba(90,167,255,.1)}}
@keyframes vision-scan{0%,20%,100%{transform:translateX(-3px)}48%,68%{transform:translateX(3px)}}
@keyframes lens-breathe{0%,100%{opacity:.72}50%{opacity:1}}
@keyframes node-signal{0%,100%{opacity:.35}50%{opacity:1}}
@keyframes hero-image-drift{0%,100%{transform:scale(1.035) translate3d(0,0,0)}50%{transform:scale(1.085) translate3d(-1.2%,0,0)}}
@keyframes hero-sheen{0%,30%{background-position:140% 0,0 0}70%,100%{background-position:-70% 0,0 0}}
@keyframes signal-line{0%,100%{transform:scaleX(.18);opacity:.28}50%{transform:scaleX(1);opacity:.9}}
.reveal{opacity:0;transform:translateY(34px);transition:opacity .75s cubic-bezier(.2,.7,.2,1),transform .75s cubic-bezier(.2,.7,.2,1)}
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.signature{display:flex;align-items:center;gap:9px;min-width:210px;height:58px;padding:3px 0;background:transparent;color:#fff;text-decoration:none;font-family:'Space Grotesk'}
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.eye-shell{stroke:var(--lime);stroke-width:3}
.eye-lens{stroke:var(--violet);stroke-width:3;animation:lens-breathe 4.8s ease-in-out infinite}
.eye-iris{fill:var(--violet)}
.eye-glint{fill:#fff;transform-origin:center;animation:vision-scan 4.8s ease-in-out infinite}
.tech-line{fill:none;stroke:var(--violet);stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.tech-node{fill:var(--lime);animation:node-signal 2.4s ease-in-out infinite}.tech-node.node-b{animation-delay:1.2s}
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.wordmark b{font-size:18px;letter-spacing:-.06em}
.wordmark strong{color:var(--lime);font-size:9px;letter-spacing:.22em;margin-top:6px}
.working-name{font:600 13px 'Space Grotesk';text-transform:uppercase;letter-spacing:.05em}
.working-name small{display:block;color:var(--muted);font:500 10px 'DM Sans';margin-top:3px}
nav{display:flex;justify-content:center;gap:24px}
nav a,.top-cta{text-decoration:none;font-size:13px;font-weight:600}
nav a{position:relative;padding:10px 0}
nav a:after{content:"";position:absolute;left:0;right:0;bottom:3px;height:2px;background:var(--action);transform:scaleX(0);transform-origin:left;transition:transform .28s ease}
nav a:hover:after,nav a:focus-visible:after{transform:scaleX(1)}
.top-cta{padding:12px 18px;border:1px solid var(--action);background:var(--action);color:#fff;box-shadow:0 8px 22px rgba(22,119,255,.24);transition:transform .25s ease,box-shadow .25s ease,background .25s ease}
.top-cta:hover,.top-cta:focus-visible{background:#0b67e8;transform:translateY(-2px);box-shadow:0 12px 28px rgba(22,119,255,.34)}
.top-cta span{display:inline-block;transition:transform .25s ease}.top-cta:hover span{transform:translate(3px,-3px)}
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.opening{min-height:calc(100vh - 82px);display:grid;grid-template-columns:1.45fr .55fr;grid-template-rows:1fr auto;background-color:var(--white);background-image:linear-gradient(rgba(49,87,213,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(49,87,213,.045) 1px,transparent 1px);background-size:64px 64px}
.opening-copy{padding:80px 4vw 60px;border-right:1px solid var(--line)}
.opening-copy{position:relative;overflow:hidden}
.opening-copy:before{content:"";position:absolute;inset:0;background:url('assets/hero-architecture.png') center center/cover no-repeat;pointer-events:none;animation:hero-image-drift 18s ease-in-out infinite;transform-origin:center}
.opening-copy:after{content:"";position:absolute;inset:0;background-image:linear-gradient(108deg,transparent 37%,rgba(90,167,255,.12) 49%,transparent 61%),linear-gradient(90deg,rgba(255,255,255,.98) 0%,rgba(255,255,255,.94) 36%,rgba(255,255,255,.58) 62%,rgba(255,255,255,.08) 100%);background-size:220% 100%,100% 100%;background-repeat:no-repeat;pointer-events:none;animation:hero-sheen 11s ease-in-out infinite}
.opening-copy>*{position:relative;z-index:1;animation:soft-rise .8s both}.opening-copy h1{animation-delay:.12s}.opening-note{animation:soft-rise .8s .22s both}
.kicker,.work header>span,.engagement-title>span,.duo-intro>span,.contact>span{font-size:12px;font-weight:700;letter-spacing:.13em;color:var(--violet)}
h1,h2,h3{font-family:'Space Grotesk',sans-serif}
h1{font-size:clamp(58px,7.2vw,108px);line-height:.91;letter-spacing:-.065em;margin:55px 0 0;font-weight:600}
h1 em{font-style:normal;color:var(--violet)}
.opening-note{align-self:end;padding:60px 3.2vw}
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.expert-strip div:after{content:"";position:absolute;left:3vw;right:3vw;bottom:0;height:2px;background:linear-gradient(90deg,transparent,var(--action),transparent);transform-origin:left;animation:signal-line 5.5s ease-in-out infinite}
.expert-strip div:nth-child(2):after{animation-delay:1.1s}.expert-strip div:nth-child(3):after{animation-delay:2.2s}
.expert-strip div:last-child{border:0}
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.expert-strip span{font-size:12px;line-height:1.4;text-transform:uppercase;letter-spacing:.06em;color:#c6c8cc}
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.side-title>span{font:700 13px 'Space Grotesk'}
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.case-no{font:600 54px 'Space Grotesk';color:#555962}
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.case-copy p{color:#b7bac0;line-height:1.65;max-width:680px}
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.engagement-title>span{color:var(--lime)}
.engagement-title h2{font-size:clamp(48px,5.5vw,78px);line-height:.97;letter-spacing:-.06em;margin:45px 0}
.engagement-title em{font-style:normal;color:var(--lime)}
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.paths article{padding:65px 3vw;border-right:1px solid var(--line)}
.paths article:last-child{border:0}
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.path-head span{font:600 38px 'Space Grotesk';color:var(--violet)}
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.paths p{line-height:1.7;color:var(--muted)}
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.paths li:before{content:'→';color:var(--violet);margin-right:10px}
.paths strong{font-size:14px;line-height:1.5}
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.approach-map:before,.approach-map:after{content:'';position:absolute;border:1px solid #30415b;border-radius:50%;inset:14% 9%}
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.axis-horizontal{height:1px;left:7%;right:7%;top:50%;animation:axis-scan 5s ease-in-out infinite}
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.map-center small{font-size:10px;letter-spacing:.12em}.map-center strong{font:600 66px/1 'Space Grotesk';color:var(--lime);margin:7px 0}.map-center span{font-size:13px;line-height:1.35}
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.approach-map:before{animation:orbit-breathe 8s ease-in-out infinite}.approach-map:after{animation:orbit-breathe 8s 1.5s ease-in-out infinite}
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.case:hover{transform:translateX(8px);border-top-color:var(--action)}
.preview-card small{font-size:10px;letter-spacing:.13em;font-weight:700}.preview-card h3{font-size:clamp(27px,3vw,40px);line-height:1.06;margin:45px 0 20px;letter-spacing:-.035em}.preview-card p{font-size:15px;line-height:1.65;margin:0;max-width:360px}.preview-card>span{margin-top:auto;font-size:11px;letter-spacing:.12em;font-weight:700}
.preview-dark{background:var(--ink);color:#fff}.preview-dark small,.preview-dark>span{color:var(--lime)}.preview-dark p{color:#b7bac0}
.preview-lime{background:#eaf2ff}.preview-lime small,.preview-lime>span{color:var(--violet)}
.certifications{padding:110px 4vw;background:var(--ink);color:#fff}
.certifications header{display:grid;grid-template-columns:.55fr 1.15fr .7fr;gap:45px;align-items:end;margin-bottom:70px}
.certifications header>span{font-size:12px;font-weight:700;letter-spacing:.13em;color:var(--lime)}
.certifications header h2{font-size:clamp(44px,5.5vw,76px);line-height:.95;letter-spacing:-.06em;margin:0}
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.cert-grid{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid #42454c;border-left:1px solid #42454c}
.cert-grid article{min-height:260px;padding:32px;border-right:1px solid #42454c;border-bottom:1px solid #42454c;position:relative;transition:background .3s ease,transform .3s ease}
.cert-grid article:hover{background:#14223a;transform:translateY(-4px)}
.cert-grid article>span{position:absolute;right:24px;top:22px;font:600 34px 'Space Grotesk';color:#394354}
.cert-grid small{color:var(--lime);font-size:11px;font-weight:700;letter-spacing:.13em}
.cert-grid h3{font-size:25px;line-height:1.15;margin:56px 0 18px;max-width:310px}
.cert-grid p{color:#aeb4bf;line-height:1.6;font-size:14px}
.duo{display:grid;grid-template-columns:1fr 1fr 1fr;background:#fff}
.duo-intro,.duo article{padding:90px 3.5vw;border-right:1px solid var(--line)}
.duo article:last-child{border:0}
.duo-intro h2{font-size:clamp(40px,4vw,58px);line-height:1;letter-spacing:-.05em;margin:40px 0}
.duo-intro p,.duo article p{line-height:1.7;color:var(--muted)}
.portrait{height:220px;display:grid;place-items:center;background:var(--ink);color:var(--lime);font:600 54px 'Space Grotesk';margin-bottom:35px}
.portrait.alt{background:var(--violet);color:#fff}
.duo article>span{font-size:10px;letter-spacing:.1em;color:var(--violet)}
.duo article h3{font-size:27px}
.duo article a{font-weight:700;text-decoration:none;border-bottom:2px solid var(--lime);padding-bottom:6px}
.contact{padding:120px 10vw;background:var(--violet);color:#fff}
.contact>span{color:var(--lime)}
.contact h2{font-size:clamp(55px,7vw,96px);line-height:.92;letter-spacing:-.065em;margin:45px 0;max-width:900px}
.contact p{font-size:18px;line-height:1.7;max-width:650px;color:#e2dffb}
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.contact>a:hover,.contact>a:focus-visible{transform:translateY(-4px);box-shadow:0 20px 42px rgba(8,26,49,.3)}
.contact>a span{display:inline-block;color:var(--action);transition:transform .25s ease}.contact>a:hover span{transform:translate(4px,-4px)}
.contact small{display:block;margin-top:15px;color:#d4d0f3}
footer{height:100px;padding:0 32px;display:flex;align-items:center;justify-content:space-between;background:var(--ink);color:#fff}
.footer-signature{display:flex;align-items:center;width:210px;height:54px;padding:7px 10px;background:#fff;border-radius:3px;text-decoration:none}
.footer-signature img{display:block;width:100%;height:auto}
footer p,footer>span{font-size:11px;color:#a8abb1;text-transform:uppercase;letter-spacing:.08em}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.opening-copy>*,.opening-copy:before,.opening-copy:after,.opening-note,.expert-strip div:after,.approach-map:before,.approach-map:after,.eye-lens,.eye-glint,.tech-node{animation:none}.reveal{opacity:1;transform:none;transition:none}.preview-card,.paths article,.duo article,.case,.note{transition:none}}
@media(max-width:900px){
.topbar{grid-template-columns:auto 1fr auto;padding:0 16px}.working-name{display:none}nav,.top-cta{display:none}.menu{display:block}
.signature{min-width:170px}.brand-logo-3d{width:170px}
.opening-copy:before{background-position:64% center}.opening-copy:after{background-image:linear-gradient(108deg,transparent 35%,rgba(90,167,255,.1) 49%,transparent 63%),linear-gradient(90deg,rgba(255,255,255,.97) 0%,rgba(255,255,255,.9) 58%,rgba(255,255,255,.3) 100%)}
.opening{grid-template-columns:1fr}.opening-copy{padding:60px 20px;border-right:0}.opening-note{padding:40px 20px}.expert-strip{grid-template-columns:1fr}.expert-strip div{border-right:0;border-bottom:1px solid #383b41}
.situations,.engagement{grid-template-columns:1fr}.side-title{padding:70px 20px}.side-title h2{position:static}
.situation-list article{grid-template-columns:38px 1fr;padding:32px 20px;min-height:auto}.situation-list p{grid-column:2}
.work{padding:80px 20px}.work header{grid-template-columns:1fr;gap:25px}.case{grid-template-columns:55px 1fr}.case-output{grid-column:2;border-left:0;padding:20px 0 0;border-top:1px solid #42454c}
.paths{grid-template-columns:1fr}.paths article{padding:50px 20px;border-right:0;border-bottom:1px solid var(--line)}
.principle,.contact{padding:80px 20px}
.approach-proof{grid-template-columns:1fr}.proof-copy{padding:70px 20px}.proof-pillars{grid-template-columns:1fr}.approach-map{min-height:520px;border-left:0}.map-label{left:20px}.map-center{width:190px;height:190px}.map-center strong{font-size:56px}.approach-map:before{inset:12% -12%}.approach-map:after{inset:25% 10%}.orbit-a{left:6%}.orbit-b{right:5%}.orbit-c{left:5%}.orbit-d{right:3%}
.field-notes{padding:80px 20px}.field-notes header{grid-template-columns:1fr;gap:24px}.notes-grid{grid-template-columns:1fr}.note{min-height:auto;padding:38px 22px;border-right:0;border-bottom:1px solid var(--line)}.note:last-child{border-bottom:0}.note h3{margin-top:40px}.note blockquote{margin-top:44px}
.studies{padding:80px 20px}.studies header{grid-template-columns:1fr;gap:24px}.study-feature{padding:35px 22px}.study-flow{grid-template-columns:1fr}.mandate-row{grid-template-columns:1fr;gap:8px}.mandate-row p{text-align:left}.study-preview{grid-template-columns:1fr}.preview-heading{min-height:220px}.preview-card{min-height:330px}
.certifications{padding:80px 20px}.certifications header{grid-template-columns:1fr;gap:24px}.cert-grid{grid-template-columns:1fr}.cert-grid article{min-height:220px;padding:28px}
.duo{grid-template-columns:1fr}.duo-intro,.duo article{padding:65px 20px;border-right:0;border-bottom:1px solid var(--line)}
footer{height:auto;padding:30px 16px;gap:20px;flex-wrap:wrap}
}

/* Liens et bouton de contact */
.principle-cta{display:inline-flex;align-items:center;gap:32px;margin-top:32px;padding:17px 24px;background:var(--violet);color:#fff;text-decoration:none;font-size:16px;font-weight:700;transition:background .25s ease,transform .25s ease}
.principle-cta:hover,.principle-cta:focus-visible{background:#174a9f;transform:translateY(-2px)}

.opening-note>a.principle-cta{gap:32px;margin-top:32px;padding:17px 24px;border:0;color:#fff}

/* Formulaire de contact */
.contact-form{max-width:900px;margin-top:42px;scroll-margin-top:110px;background:#fff;color:var(--ink);padding:36px}
.contact-fields{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-bottom:24px}
.contact-fields>div{min-width:0}
.contact-form label{display:block;font-size:16px;font-weight:700;margin-bottom:9px}
.contact-form label span{font-size:14px;font-weight:400;color:var(--muted)}
.contact-form input,.contact-form textarea{width:100%;box-sizing:border-box;min-width:0;padding:13px 14px;border:1px solid #9baac0;background:#f8faff;color:var(--ink);font:inherit;font-size:16px;border-radius:0}
.contact-form textarea{resize:vertical;min-height:150px}
.contact-form input:focus,.contact-form textarea:focus{outline:3px solid #5aa7ff;outline-offset:2px}
.contact .form-note,.contact .form-status{font-size:14px;line-height:1.6;color:var(--muted);margin:18px 0}
.contact .form-status:empty{display:none}
.contact-submit{display:inline-flex;align-items:center;justify-content:center;gap:24px;max-width:100%;padding:17px 24px;border:0;background:var(--violet);color:#fff;font:inherit;font-size:16px;font-weight:700;cursor:pointer}
.contact-submit:hover{background:#174a9f}
.contact-submit:focus-visible{outline:3px solid var(--ink);outline-offset:4px}
@media(max-width:600px){.contact-form{padding:24px 18px}.contact-fields{grid-template-columns:1fr;gap:20px}.contact-submit{width:100%}}

/* Ancrages dégagés sous le menu permanent */
main>section[id]{scroll-margin-top:100px}
.contact-form .form-note a{text-decoration:underline;overflow-wrap:anywhere}

/* Retour en haut */
.back-to-top{position:fixed;right:24px;bottom:calc(24px + env(safe-area-inset-bottom,0px));z-index:90;display:grid;place-items:center;width:48px;height:48px;padding:0;border:1px solid rgba(255,255,255,.55);border-radius:50%;background:var(--violet);color:#fff;box-shadow:0 6px 20px rgba(8,26,49,.24);font:600 28px 'DM Sans',sans-serif;cursor:pointer;transition:background .2s ease,transform .2s ease}
.back-to-top[hidden]{display:none}
.back-to-top:hover{background:#174a9f;transform:translateY(-3px)}
.back-to-top:focus-visible{outline:3px solid var(--lime);outline-offset:4px}
@media(max-width:600px){.back-to-top{right:16px;bottom:calc(16px + env(safe-area-inset-bottom,0px))}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.back-to-top{transition:none}}

/* Pied de page */
.site-footer{display:block;height:auto;padding:44px 4vw 32px;background:var(--ink);color:#fff}
.footer-main{display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap;padding-bottom:30px}
.site-footer .footer-main p{font-size:14px;line-height:1.6;letter-spacing:.02em;text-transform:none;color:#c4ccd8}
.footer-contact{font-size:16px;font-weight:600;text-underline-offset:5px}
.footer-bottom{border-top:1px solid #344258;padding-top:24px;display:grid;grid-template-columns:1fr 1fr;gap:28px;padding-right:64px}
.footer-bottom>small{font-size:14px;color:#c4ccd8;line-height:1.7}
.footer-notices{display:flex;flex-direction:column;gap:16px;min-width:0}
.footer-notices summary{cursor:pointer;font-size:14px;font-weight:600;width:fit-content}
.footer-notices summary:focus-visible,.site-footer a:focus-visible{outline:2px solid var(--lime);outline-offset:5px}
.notice-content{padding:8px 0 8px 16px;border-left:2px solid #41638e;margin-top:16px}
.notice-content h3{font-size:17px;line-height:1.4;margin:8px 0}
.site-footer .notice-content p{font-size:14px;line-height:1.7;color:#c4ccd8;text-transform:none;letter-spacing:0}
.notice-content a{text-underline-offset:3px}
@media(max-width:700px){.site-footer{padding:36px 20px 80px}.footer-main{align-items:flex-start;flex-direction:column;gap:16px}.footer-bottom{grid-template-columns:1fr;padding-right:0}.footer-main p{margin:0}}