:root{--sans:"Helvetica Neue","Segoe UI","Roboto",system-ui,-apple-system,Arial,sans-serif}

:root{--paper:#000;--ink:#ececec;--mat:#1a1a1a;--accent:#7cc0bd;--muted:#a0a8a6;color-scheme:dark}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:300 17px/1.6 var(--sans)}
header{display:flex;flex-wrap:wrap;gap:1rem 2rem;align-items:baseline;justify-content:space-between;padding:1.2rem clamp(1rem,4vw,3rem);border-bottom:1px solid color-mix(in srgb,var(--ink) 18%,transparent)}
.brand{font:300 1.4rem var(--sans);color:var(--ink);text-decoration:none}.brand small{display:block;font:300 .8rem var(--sans);color:var(--muted)}
nav{display:flex;flex-wrap:wrap;gap:.3rem 1.1rem}nav a{color:var(--ink);text-decoration:none;padding:.2rem 0;border-bottom:2px solid transparent}
nav a:hover,nav a[aria-current]{border-color:var(--accent)}a:focus-visible,button:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
main{max-width:1400px;margin:0 auto;padding:2.5rem clamp(1rem,4vw,3rem) 4rem}
h1{font:300 clamp(2rem,5vw,3.4rem)/1.1 var(--sans);margin:0 0 .6rem;max-width:20ch}
h2{font:300 1.5rem var(--sans);margin:2.5rem 0 .8rem}.intro,.meta{color:var(--muted);max-width:60ch}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));grid-auto-flow:dense;gap:.5rem}.ph{position:relative;display:block;overflow:hidden;background:var(--mat);aspect-ratio:3/2;color:#fff;text-decoration:none}
.ph img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .4s}.ph:hover img{transform:scale(1.03)}.ph span{position:absolute;left:0;right:0;bottom:0;padding:2rem .9rem .7rem;font-size:.9rem;background:linear-gradient(transparent,rgba(0,0,0,.7));opacity:0;transition:opacity .25s}.ph:hover span,.ph:focus-visible span{opacity:1}.mosaic .ph:nth-child(6n+1){grid-column:span 2;grid-row:span 2;aspect-ratio:auto}@media(max-width:640px){.mosaic .ph:nth-child(6n+1){grid-column:auto;grid-row:auto;aspect-ratio:3/2}.hero .ph{aspect-ratio:16/9}}
.hero .ph{aspect-ratio:21/9;margin:1.5rem 0 0}.hero .ph span{opacity:1;font-size:1.1rem;padding:3rem 1.2rem 1rem}.news{padding-left:1.1rem}.actu{padding:1rem 0;border-top:1px solid color-mix(in srgb,var(--ink) 18%,transparent);max-width:65ch}
.actu h2{margin:.2rem 0}.actu time{color:var(--muted);font-size:.9rem}.membre{margin-top:2.5rem}
footer{padding:2rem clamp(1rem,4vw,3rem);color:var(--muted);font-size:.9rem;border-top:1px solid color-mix(in srgb,var(--ink) 18%,transparent)}
#lb{position:fixed;inset:0;background:rgba(10,12,12,.94);display:none;align-items:center;justify-content:center;flex-direction:column;z-index:9;padding:1rem}
#lb.on{display:flex}#lb img{max-width:96vw;max-height:84vh}#lb p{color:#ddd;margin:.8rem 0 0}
#lb button{position:absolute;background:none;border:0;color:#fff;font-size:2.4rem;cursor:pointer;padding:.6rem 1rem}
#lb .x{top:.5rem;right:.5rem}#lb .p{left:.3rem;top:50%}#lb .n{right:.3rem;top:50%}
.empty{color:var(--muted)}.actu p{margin:.4rem 0}

nav .dd{position:relative}
nav .dd>a::after{content:" ▾";font-size:.7em;line-height:0}
nav .sub{display:none;position:absolute;top:100%;left:-.9rem;min-width:11rem;flex-direction:column;background:var(--paper);border:1px solid color-mix(in srgb,var(--ink) 25%,transparent);padding:.4rem 0;z-index:5}
nav .dd:hover .sub,nav .dd:focus-within .sub{display:flex}
nav .sub a{padding:.4rem 1.1rem;border:0;white-space:nowrap}
nav .sub a:hover,nav .sub a:focus-visible{background:color-mix(in srgb,var(--ink) 14%,transparent)}
.jump a{color:var(--accent)}
section[id]{scroll-margin-top:4.5rem}
@media(max-width:640px){nav .sub{display:none!important}nav .dd>a::after{content:""}}

/* Page Expositions : choix de la vue */
.vues{position:sticky;top:0;z-index:4;display:flex;flex-wrap:wrap;align-items:center;gap:.4rem;padding:.7rem 0;background:var(--paper)}
.vues span{color:var(--muted);margin-right:.3rem;font-size:.9rem}
.vues button{font:inherit;font-size:.9rem;color:var(--ink);background:none;border:1px solid color-mix(in srgb,var(--ink) 30%,transparent);padding:.3rem .8rem;cursor:pointer}
.vues button:hover{border-color:var(--ink)}
.vues button[aria-pressed=true]{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.gal{gap:4px;margin-top:.8rem}.gal .ph span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
/* Rivière (par défaut) : rangées de même hauteur, proportions d'origine, remplissage complet gauche-droite */
.v-riviere .gal{display:flex;flex-wrap:wrap;--h:150px}
.v-riviere .gal .ph{flex:var(--r) 1 calc(var(--r) * var(--h));min-width:0;aspect-ratio:var(--r)}
.v-riviere .gal::after{content:"";flex:1000000 1 0}
/* Petite / moyenne / grande / carré : grille régulière */
.v-petite .gal,.v-moyenne .gal,.v-grande .gal,.v-carre .gal{display:grid;grid-template-columns:repeat(auto-fill,minmax(var(--s),1fr))}
.v-petite .gal{--s:120px}.v-moyenne .gal{--s:200px}.v-grande .gal{--s:320px}.v-carre .gal{--s:170px}
.v-petite .gal .ph,.v-moyenne .gal .ph,.v-grande .gal .ph{aspect-ratio:3/2}.v-carre .gal .ph{aspect-ratio:1}
@media(max-width:640px){.v-riviere .gal{--h:100px}.v-petite .gal{--s:90px}.v-moyenne .gal{--s:140px}}

/* Logo, qui sommes-nous, contact */
header{align-items:center}.brand img{display:block;height:76px;width:auto}
h1{max-width:30ch}
.about{max-width:70ch}.about-ph{margin:0 0 1.5rem}.about-ph img{display:block;width:100%;height:auto}
.liens{color:var(--muted)}.liens a{color:var(--accent)}
.coord{display:grid;grid-template-columns:max-content 1fr;gap:.5rem 1.5rem;margin:1.5rem 0}.coord dt{color:var(--muted)}.coord dd{margin:0}.coord a{color:var(--accent)}
.cf{display:grid;gap:1rem;max-width:36rem}.cf label{display:grid;gap:.3rem;font-size:.9rem;color:var(--muted)}
.cf input,.cf textarea{font:inherit;color:var(--ink);background:var(--mat);border:1px solid color-mix(in srgb,var(--ink) 30%,transparent);padding:.6rem .7rem}
.cf input:focus-visible,.cf textarea:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.cf button{justify-self:start;font:inherit;color:var(--paper);background:var(--ink);border:0;padding:.6rem 1.6rem;cursor:pointer}

main h3{font:300 1.2rem var(--sans);margin:1.8rem 0 .4rem}main p a,.actu a,.about a{color:var(--accent)}

main ul,main ol{max-width:65ch;padding-left:1.3rem}blockquote{margin:1rem 0;padding-left:1rem;border-left:3px solid var(--accent);color:var(--muted);max-width:60ch}blockquote p{margin:.3rem 0}

/* Galerie thématique */
.themes{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,165px),1fr));gap:1rem;margin-top:1.5rem}
.theme{display:block;color:var(--ink);text-decoration:none}
.theme img{display:block;width:100%;aspect-ratio:3/2;object-fit:cover;background:var(--mat)}
.theme span{display:block;padding:.4rem 0;font-size:.95rem;line-height:1.3}.theme small{display:block;color:var(--muted);font-size:.85rem}
.theme:hover span,.theme:focus-visible span{text-decoration:underline}
main p.meta a{color:var(--accent)}

.theme .noimg{aspect-ratio:3/2;background:var(--mat);display:grid;place-items:center;font:300 3rem var(--sans);color:var(--muted)}

/* Accueil : diaporama en fond */
.slider{position:fixed;inset:0;z-index:-1;background:#000}
.slider div{position:absolute;inset:0;background-size:cover;background-position:center;opacity:0;transition:opacity 1.6s ease}
.slider div.on{opacity:1}
.slider::after{content:"";position:absolute;inset:0;background:linear-gradient(rgba(0,0,0,.6),rgba(0,0,0,.3) 35%,rgba(0,0,0,.3) 60%,rgba(0,0,0,.7))}
.home header{border-bottom-color:rgba(255,255,255,.15)}
.home main{min-height:calc(100vh - 190px)}
.home h1{text-shadow:0 2px 14px rgba(0,0,0,.7);font-size:clamp(2.2rem,6vw,4.2rem);margin-top:2rem}
.home .enter a{display:inline-block;margin-top:1rem;padding:.6rem 1.4rem;border:1px solid var(--ink);color:var(--ink);text-decoration:none}
.home .enter a:hover,.home .enter a:focus-visible{background:var(--ink);color:#000}
.panel{max-width:70ch;margin-top:3rem;padding:1rem 1.5rem 1.2rem;background:rgba(0,0,0,.62)}
.panel h2{margin-top:.5rem}
.home footer{background:rgba(0,0,0,.5);border-top-color:rgba(255,255,255,.15)}
@media(prefers-reduced-motion:reduce){.slider div{transition:none}}

/* Police fine, sans empattement */
strong,b{font-weight:600}
.brand{display:flex;align-items:center;gap:1rem;text-decoration:none;color:var(--ink)}
.brand-t{font:300 1.5rem/1.1 var(--sans);letter-spacing:.03em;white-space:nowrap}
.brand-t small{display:block;margin-top:.2rem;font:300 .8rem var(--sans);letter-spacing:.04em;color:var(--muted)}
.home .brand-t small{color:#cfd5d3}
@media(max-width:640px){.brand img{height:56px}.brand-t{font-size:1.2rem}.brand-t small{display:none}}

/* Menu burger (écrans étroits ; sans JavaScript, le menu reste visible) */
.burger{display:none;margin-left:auto;width:44px;height:44px;padding:11px 9px;background:none;border:1px solid color-mix(in srgb,var(--ink) 35%,transparent);cursor:pointer;flex-direction:column;justify-content:space-between}
.burger span{display:block;height:2px;background:var(--ink);transition:transform .2s,opacity .2s}
.burger[aria-expanded=true] span:nth-child(1){transform:translateY(8px) rotate(45deg)}
.burger[aria-expanded=true] span:nth-child(2){opacity:0}
.burger[aria-expanded=true] span:nth-child(3){transform:translateY(-8px) rotate(-45deg)}
@media(max-width:1240px){
 .js .burger{display:flex}
 .js nav{display:none;flex-basis:100%;flex-direction:column;gap:0;background:var(--paper);border-top:1px solid color-mix(in srgb,var(--ink) 18%,transparent)}
 .js nav.open{display:flex}
 .js nav a{padding:.85rem .2rem;border-bottom:1px solid color-mix(in srgb,var(--ink) 12%,transparent)}
 .js nav a[aria-current]{border-bottom-color:color-mix(in srgb,var(--ink) 12%,transparent);color:var(--accent)}
 .home.js nav,.js .home nav{background:rgba(0,0,0,.88)}
}
@media(prefers-reduced-motion:reduce){.burger span{transition:none}}

.js .brand{min-width:0}
@media(max-width:640px){.js .brand{flex:1 1 0}.brand-t{white-space:normal;font-size:1.1rem}.brand{gap:.7rem}.brand img{height:50px}header{gap:.6rem 1rem}}