:root {
  --noir: #0B0B0B;
  --anthracite: #1C1C1C;
  --or: #C0A060;
  --beige: #E0D0B0;
  --pierre: #9A9389;
  --serif: 'Playfair Display', Georgia, serif;
  --sans: 'Outfit', 'Helvetica Neue', Arial, sans-serif;
  --marge: clamp(24px, 8.33vw, 120px);
  --photo: grayscale(.92) sepia(.12) contrast(1.08) brightness(.92);
  --ease: cubic-bezier(.22, .61, .36, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { background: var(--noir); color: var(--beige); font-family: var(--sans); font-weight: 300; -webkit-font-smoothing: antialiased; }
img { display: block; width: 100%; height: 100%; object-fit: cover; filter: var(--photo); }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul, ol { list-style: none; }
figure { overflow: hidden; background: var(--anthracite); }

h1, h2, h3 { font-family: var(--serif); font-weight: 400; color: var(--beige); }
h2 { font-size: clamp(38px, 4.45vw, 64px); line-height: 1.1; max-width: 15ch; }
.label { font-size: 12px; letter-spacing: 3px; color: var(--or); font-weight: 400; margin-bottom: 20px; }
.intro { font-size: clamp(16px, 1.25vw, 18px); line-height: 1.65; opacity: .85; max-width: 640px; }
.section { padding: clamp(88px, 11vw, 160px) var(--marge); }
.entete { margin-bottom: clamp(48px, 5vw, 72px); }

/* Apparitions */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 1.1s var(--ease), transform 1.1s var(--ease); }
.reveal.visible { opacity: 1; transform: none; }
figure.reveal img { transform: scale(1.06); transition: transform 1.6s var(--ease); }
figure.reveal.visible img { transform: scale(1); }

/* Navigation */
.nav { position: fixed; inset: 0 0 auto 0; z-index: 50; display: flex; align-items: center; gap: 40px; padding: 28px var(--marge); transition: background .5s, padding .5s; }
.nav.solide { background: rgba(11, 11, 11, .92); backdrop-filter: blur(8px); padding-top: 18px; padding-bottom: 18px; border-bottom: 1px solid rgba(192, 160, 96, .2); }
.logo { font-weight: 500; font-size: 14px; letter-spacing: 5px; color: var(--beige); margin-right: auto; }
.menu { display: flex; gap: 40px; }
.menu a, .nav-cta { font-size: 13px; letter-spacing: 1px; color: rgba(224, 208, 176, .85); text-shadow: 0 1px 12px rgba(11, 11, 11, .9); transition: color .3s; }
.menu a:hover { color: var(--beige); }
.nav-cta { color: var(--or); border: 1px solid var(--or); padding: 12px 22px; transition: background .3s, color .3s; }
.nav-cta:hover { background: var(--or); color: var(--noir); }
.burger { display: none; width: 32px; height: 20px; flex-direction: column; justify-content: center; align-items: flex-end; gap: 6px; }
.burger span { display: block; height: 1px; background: var(--or); transition: transform .4s var(--ease), width .4s; }
.burger span:first-child { width: 32px; }
.burger span:last-child { width: 20px; }

/* Accueil */
.hero { position: relative; height: 100vh; min-height: 640px; overflow: hidden; }
.hero-img { position: absolute; inset: 0; background: url('images/escalier-lumiere.jpg') center / cover no-repeat; filter: var(--photo); transform: scale(1.08); animation: respiration 2.4s var(--ease) forwards; }
@keyframes respiration { to { transform: scale(1); } }
.hero-voile { position: absolute; inset: 0; background: linear-gradient(180deg, rgba(11,11,11,.85) 0%, rgba(11,11,11,.35) 22%, rgba(11,11,11,.4) 50%, rgba(11,11,11,.95) 100%); }
.plan { position: absolute; inset: 0; width: 100%; height: 100%; }
.trait { stroke: var(--or); stroke-opacity: .35; stroke-width: 1; vector-effect: non-scaling-stroke; stroke-dasharray: 1600; stroke-dashoffset: 1600; animation: tracer 2.2s var(--ease) forwards; }
.trait:nth-child(2) { animation-delay: .2s; } .trait:nth-child(3) { animation-delay: .4s; } .trait:nth-child(4) { animation-delay: .6s; }
@keyframes tracer { to { stroke-dashoffset: 0; } }
.cote { position: absolute; font-size: 10px; letter-spacing: 2px; color: var(--or); opacity: 0; animation: apparaitre 1s 1.6s forwards; }
.cote-top { top: calc(13.3% + 8px); left: 50%; }
@keyframes apparaitre { to { opacity: .7; } }
.hero-contenu { position: absolute; left: var(--marge); right: var(--marge); bottom: clamp(110px, 14vh, 150px); }
.hero h1 { font-size: clamp(56px, 7.8vw, 112px); line-height: 1; margin-bottom: 28px; }
.hero-sous { font-size: clamp(16px, 1.4vw, 20px); line-height: 1.5; max-width: 560px; opacity: .85; margin-bottom: 40px; }
.hero .reveal { transition-delay: .9s; }
.hero h1.reveal { transition-delay: 1.05s; } .hero-sous.reveal { transition-delay: 1.2s; } .hero .lien-souligne.reveal { transition-delay: 1.35s; }
.lien-souligne { display: inline-block; font-weight: 500; font-size: 14px; letter-spacing: 2px; padding-bottom: 10px; background: linear-gradient(var(--or), var(--or)) left bottom / 60px 1px no-repeat; transition: background-size .5s var(--ease); }
.lien-souligne:hover { background-size: 100% 1px; }
.defiler { position: absolute; right: var(--marge); bottom: 40px; font-size: 11px; letter-spacing: 3px; color: var(--pierre); }

/* Manifeste */
.manifeste { display: grid; grid-template-columns: minmax(0, 520px) minmax(0, 640px); gap: clamp(48px, 8vw, 120px); align-items: center; }
.manifeste-img { aspect-ratio: 520 / 680; }
.manifeste h2 { margin-bottom: 32px; }
.principes { margin-top: 40px; }
.principes li { border-top: 1px solid rgba(192, 160, 96, .5); padding: 20px 0 24px; }
.principes h3, .etapes h3 { font-size: 24px; margin-bottom: 8px; }
.principes p, .etapes p, .expertise p, .projet p:not(.meta):not(.lieu) { color: var(--pierre); font-size: 16px; line-height: 1.6; }

/* Réalisations */
.grille-projets { display: grid; grid-template-columns: 1fr 1fr; column-gap: 40px; row-gap: 96px; }
.projet.decale { margin-top: 160px; margin-bottom: -160px; }
.projet figure { aspect-ratio: 580 / 420; margin-bottom: 18px; }
.projet img { transition: transform 1.2s var(--ease), filter .8s; }
.projet:hover img { transform: scale(1.04); filter: grayscale(.4) sepia(.12) contrast(1.08) brightness(.95); }
.meta { font-size: 12px; letter-spacing: 1px; color: var(--pierre); margin-bottom: 14px; }
.meta span { color: var(--or); margin-right: 16px; letter-spacing: 2px; }
.projet h3 { font-size: 36px; margin-bottom: 8px; }
.lieu { font-size: 12px; letter-spacing: 3px; color: var(--or); margin-bottom: 14px; }
.lien-projet { margin-top: 16px; font-weight: 500; font-size: 13px; letter-spacing: 2px; color: var(--beige); transition: color .3s, letter-spacing .4s; }
.lien-projet:hover { color: var(--or); letter-spacing: 3px; }
.realisations { padding-bottom: calc(clamp(88px, 11vw, 160px) + 160px); }

/* Expertises */
.expertises { background: var(--anthracite); }
.grille-expertises { display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px; }
.expertise { border-top: 1px solid rgba(192, 160, 96, .6); padding-top: 18px; }
.expertise .num { font-family: var(--serif); color: var(--or); font-size: 20px; display: block; margin-bottom: 18px; }
.expertise h3 { font-size: 26px; line-height: 1.2; margin-bottom: 18px; }
.expertise p { font-size: 15px; }

/* Méthode */
.methode { display: grid; grid-template-columns: minmax(0, 640px) minmax(0, 520px); gap: clamp(48px, 8vw, 120px); align-items: center; }
.methode h2 { margin-bottom: 56px; }
.etapes { border-left: 1px solid rgba(192, 160, 96, .6); padding-left: 28px; display: grid; gap: 36px; }
.methode-img { aspect-ratio: 520 / 760; }

/* Chiffres */
.chiffres { display: flex; justify-content: space-between; gap: 32px; padding: 96px var(--marge); border-top: 1px solid rgba(192,160,96,.35); border-bottom: 1px solid rgba(192,160,96,.35); }
.chiffre strong { display: block; font-family: var(--serif); font-weight: 400; font-size: clamp(60px, 6.1vw, 88px); line-height: 1; color: var(--or); }
.chiffre span { font-size: 13px; letter-spacing: 2px; color: var(--pierre); }

/* Contact */
.contact { display: grid; grid-template-columns: minmax(0, 520px) minmax(0, 560px); gap: clamp(48px, 8vw, 120px); padding-bottom: 120px; }
.contact h2 { margin-bottom: 32px; }
.contact-img { aspect-ratio: 520 / 300; margin: 40px 0; }
address { font-style: normal; font-size: 14px; letter-spacing: 1px; line-height: 1.9; color: var(--pierre); }
address a { color: var(--beige); border-bottom: 1px solid rgba(192,160,96,.6); }
.formulaire { padding-top: 120px; display: grid; gap: 36px; align-content: start; }
.formulaire label, .formulaire legend { display: grid; gap: 14px; font-size: 11px; letter-spacing: 3px; color: var(--pierre); text-transform: uppercase; }
.formulaire input[type=text], .formulaire input[type=email], .formulaire textarea { background: none; border: 0; border-bottom: 1px solid rgba(192,160,96,.5); color: var(--beige); font: 300 16px var(--sans); letter-spacing: 0; padding: 4px 0 12px; outline: none; resize: none; transition: border-color .3s; }
.formulaire input:focus, .formulaire textarea:focus { border-color: var(--or); }
.formulaire input.erreur { border-color: #b4574b; }
fieldset { border: 0; }
.choix { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 14px; }
.choix label { display: block; letter-spacing: 0; text-transform: none; }
.choix input { position: absolute; opacity: 0; }
.choix span { display: block; border: 1px solid rgba(192,160,96,.4); padding: 8px 16px; font-size: 13px; color: var(--pierre); cursor: pointer; transition: all .3s; }
.choix input:checked + span { border-color: var(--or); color: var(--or); }
.choix input:focus-visible + span { outline: 1px solid var(--beige); outline-offset: 3px; }
.bouton-or { justify-self: start; background: var(--or); color: var(--noir); font-weight: 500; font-size: 14px; letter-spacing: 2px; padding: 18px 32px; transition: background .3s; }
.bouton-or:hover { background: var(--beige); }
.merci { font-family: var(--serif); font-size: 22px; color: var(--or); }

/* Pied de page */
.pied { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 40px var(--marge); border-top: 1px solid rgba(192,160,96,.35); font-size: 12px; letter-spacing: 1px; color: var(--pierre); }
.pied .logo { margin: 0; font-size: 13px; }
.lien-mentions { font-size: 12px; letter-spacing: 1px; color: var(--pierre); border-bottom: 1px solid rgba(192,160,96,.4); }

/* Fenêtres */
.fenetre { margin: auto; width: min(1000px, 92vw); max-height: 90vh; background: var(--anthracite); color: var(--beige); border: 1px solid rgba(192,160,96,.4); display: none; grid-template-columns: 1fr 1fr; padding: 0; }
.fenetre[open] { display: grid; animation: ouvrir .5s var(--ease); }
.fenetre::backdrop { background: rgba(11,11,11,.85); backdrop-filter: blur(4px); }
@keyframes ouvrir { from { opacity: 0; transform: translateY(16px); } }
.fenetre img { height: 100%; min-height: 360px; }
.fenetre-texte { padding: 48px; display: grid; gap: 18px; align-content: center; }
.fenetre h3 { font-size: 40px; }
.fenetre p { color: var(--pierre); line-height: 1.6; }
.fenetre dl { display: grid; grid-template-columns: auto 1fr; gap: 8px 24px; font-size: 13px; border-top: 1px solid rgba(192,160,96,.5); padding-top: 18px; }
.fenetre dt { color: var(--or); letter-spacing: 2px; font-size: 11px; }
.fenetre-texte-seul { grid-template-columns: 1fr; width: min(640px, 92vw); }
.fermer { position: absolute; top: 14px; right: 14px; width: 40px; height: 40px; display: grid; place-items: center; font-size: 26px; line-height: 1; color: var(--or); background: rgba(11, 11, 11, .75); border: 1px solid rgba(192, 160, 96, .4); border-radius: 50%; z-index: 2; }

/* Tablette et mobile */
@media (max-width: 1024px) {
  .grille-expertises { grid-template-columns: 1fr 1fr; }
  .menu { gap: 24px; }
}
@media (max-width: 820px) {
  .menu { position: fixed; inset: 0; background: var(--noir); flex-direction: column; justify-content: center; align-items: center; gap: 32px; opacity: 0; pointer-events: none; transition: opacity .5s var(--ease); }
  .menu a { font-family: var(--serif); font-size: 32px; color: var(--beige); }
  .menu.ouvert { opacity: 1; pointer-events: auto; }
  /* Le flou crée un nouveau repère : le menu plein écran resterait coincé dans la barre */
  .nav.solide { backdrop-filter: none; background: rgba(11, 11, 11, .97); }
  .nav-cta { display: none; }
  .burger { display: flex; z-index: 60; }
  .burger.ouvert span:first-child { transform: translateY(3.5px) rotate(45deg); width: 26px; }
  .burger.ouvert span:last-child { transform: translateY(-3.5px) rotate(-45deg); width: 26px; }
  .logo { z-index: 60; font-size: 12px; letter-spacing: 4px; }
  .label { font-size: 11px; letter-spacing: 2.5px; }
  .manifeste, .methode, .contact { grid-template-columns: 1fr; }
  .manifeste-img { order: 2; aspect-ratio: 342 / 420; }
  .methode-img { order: -1; aspect-ratio: 342 / 300; }
  .grille-projets { grid-template-columns: 1fr; row-gap: 56px; }
  .projet.decale { margin: 0; }
  .realisations { padding-bottom: 88px; }
  .projet figure { aspect-ratio: 342 / 250; }
  .projet h3 { font-size: 28px; }
  .grille-expertises { grid-template-columns: 1fr; gap: 36px; }
  .chiffres { display: grid; grid-template-columns: 1fr 1fr; gap: 36px 16px; padding: 72px var(--marge); }
  .formulaire { padding-top: 0; }
  .contact-img { order: 5; }
  .bouton-or { justify-self: stretch; }
  .pied { flex-direction: column; align-items: flex-start; gap: 10px; }
  .fenetre[open] { grid-template-columns: 1fr; overflow-y: auto; }
  .fenetre img { min-height: 220px; max-height: 260px; }
  .fenetre-texte { padding: 28px; }
  .fenetre h3 { font-size: 30px; }
  .defiler { display: none; }
  .hero-contenu { bottom: 80px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
  .trait { stroke-dashoffset: 0; }
  .cote { opacity: .7; }
}