/* ==========================================================================
   AZ ARCHITECTURE ET URBANISME — Design System
   Palette : blanc cassé / beige / gris architectural / anthracite / noir / or
   Typo    : Fraunces (display serif) + Inter (texte)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,300;0,9..144,400;0,9..144,500;0,9..144,600;1,9..144,400&family=Inter:wght@300;400;500;600&display=swap');

:root{
  --blanc-casse:#F6F2EA;
  --beige:#E7DEC9;
  --beige-soft:#EFE8D8;
  --gris:#8F897C;
  --gris-clair:#B9B3A5;
  --anthracite:#2B2823;
  --noir:#15130F;
  --or:#A9803F;
  --or-clair:#C7A164;
  --blanc:#FFFFFF;

  --font-serif:'Fraunces', serif;
  --font-sans:'Inter', sans-serif;

  --max-w:1320px;
  --gutter:clamp(20px, 5vw, 72px);
  --section-pad:clamp(64px, 10vw, 140px);

  --ease:cubic-bezier(.16,.8,.24,1);
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *{ animation-duration:.001ms !important; transition-duration:.001ms !important; }
}

body{
  margin:0;
  font-family:var(--font-sans);
  color:var(--anthracite);
  background:var(--blanc-casse);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ margin:0; padding:0; list-style:none; }
button{ font-family:inherit; cursor:pointer; }
input,textarea,select{ font-family:inherit; font-size:1rem; }

h1,h2,h3,h4{
  font-family:var(--font-serif);
  font-weight:500;
  line-height:1.08;
  margin:0;
  letter-spacing:-.01em;
  color:var(--noir);
}
h1{ font-size:clamp(2.6rem, 5.4vw, 4.8rem); font-weight:400; }
h2{ font-size:clamp(2rem, 3.6vw, 3.1rem); }
h3{ font-size:clamp(1.35rem, 2vw, 1.75rem); }
h4{ font-size:1.05rem; }

p{ margin:0; }

.container{
  max-width:var(--max-w);
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
}

.section{ padding:var(--section-pad) 0; }
.section--tight{ padding:clamp(40px,6vw,80px) 0; }
.section--line-top{ border-top:1px solid rgba(43,40,35,.12); }
.section--dark{ background:var(--anthracite); color:var(--beige-soft); }
.section--dark h1,.section--dark h2,.section--dark h3{ color:var(--blanc-casse); }
.section--beige{ background:var(--beige-soft); }

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.6em;
  font-family:var(--font-sans);
  font-size:.72rem;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--or);
  font-weight:600;
  margin-bottom:1.1em;
}
.eyebrow::before{
  content:'';
  width:22px; height:1px;
  background:var(--or);
  display:inline-block;
}

.lede{
  font-size:clamp(1.05rem,1.4vw,1.25rem);
  color:var(--gris);
  max-width:46ch;
  line-height:1.65;
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:.6em;
  padding:.95em 1.9em;
  font-size:.92rem;
  font-weight:500;
  letter-spacing:.02em;
  border:1px solid var(--noir);
  background:var(--noir);
  color:var(--blanc-casse);
  transition:background .3s var(--ease), color .3s var(--ease), border-color .3s var(--ease);
  white-space:nowrap;
}
.btn:hover{ background:var(--or); border-color:var(--or); color:var(--noir); }
.btn--outline{ background:transparent; color:var(--noir); border-color:var(--anthracite); }
.btn--outline:hover{ background:var(--noir); color:var(--blanc-casse); border-color:var(--noir); }
.btn--on-dark{ border-color:var(--beige-soft); color:var(--beige-soft); background:transparent; }
.btn--on-dark:hover{ background:var(--or); border-color:var(--or); color:var(--noir); }
.btn--small{ padding:.7em 1.4em; font-size:.82rem; }

/* ---------- Header / Nav ---------- */
.site-header{
  position:sticky; top:0; z-index:200;
  background:rgba(246,242,234,.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid rgba(43,40,35,.1);
}
.site-header .container{
  display:flex; align-items:center; justify-content:space-between;
  height:84px;
}
.brand{ display:flex; align-items:center; gap:.7em; }
.brand img{ height:38px; width:auto; mix-blend-mode:multiply; }
.brand-name{ font-family:var(--font-serif); font-size:1.05rem; letter-spacing:.04em; }
.brand-name b{ font-weight:600; color:var(--or); }

.main-nav ul{ display:flex; gap:clamp(16px,2.2vw,34px); }
.main-nav a{
  font-size:.83rem; letter-spacing:.06em; text-transform:uppercase;
  font-weight:500; color:var(--anthracite);
  position:relative; padding:6px 0;
}
.main-nav a::after{
  content:''; position:absolute; left:0; right:100%; bottom:0; height:1px;
  background:var(--or); transition:right .3s var(--ease);
}
.main-nav a:hover::after, .main-nav a.active::after{ right:0; }
.main-nav a.active{ color:var(--or); }

.nav-toggle{
  display:none; flex-direction:column; gap:5px; background:none; border:0; padding:8px;
}
.nav-toggle span{ width:24px; height:1px; background:var(--noir); display:block; }

@media (max-width: 880px){
  .main-nav{
    position:fixed; inset:84px 0 0 0; background:var(--blanc-casse);
    transform:translateY(-8px); opacity:0; pointer-events:none;
    transition:opacity .25s var(--ease), transform .25s var(--ease);
    overflow-y:auto;
  }
  .main-nav.is-open{ opacity:1; pointer-events:auto; transform:translateY(0); }
  .main-nav ul{ flex-direction:column; padding:40px var(--gutter); gap:26px; }
  .main-nav a{ font-size:1.1rem; }
  .nav-toggle{ display:flex; }
}

/* ---------- Hero ---------- */
.hero{
  display:grid; grid-template-columns:1.1fr 1fr; align-items:stretch;
  min-height:min(86vh, 780px);
}
.hero-copy{
  display:flex; flex-direction:column; justify-content:center;
  padding:clamp(40px,6vw,90px) var(--gutter);
  gap:1.6rem;
}
.hero-copy h1{ max-width:12ch; }
.hero-actions{ display:flex; gap:14px; flex-wrap:wrap; margin-top:.6rem; }
.hero-media{ position:relative; overflow:hidden; background:var(--anthracite); }
.hero-media img{ width:100%; height:100%; object-fit:cover; opacity:0; animation:fadeIn 1.1s var(--ease) .15s forwards; }
@keyframes fadeIn{ to{ opacity:1; } }
.hero-media::after{
  content:''; position:absolute; inset:0;
  background:linear-gradient(180deg, rgba(21,19,15,0) 55%, rgba(21,19,15,.35));
}
@media (max-width: 880px){
  .hero{ grid-template-columns:1fr; min-height:auto; }
  .hero-media{ height:56vw; order:-1; }
}

/* ---------- Grid utilities ---------- */
.grid-2{ display:grid; grid-template-columns:1fr 1fr; gap:clamp(28px,4vw,64px); }
.grid-3{ display:grid; grid-template-columns:repeat(3,1fr); gap:clamp(24px,3vw,40px); }
.grid-4{ display:grid; grid-template-columns:repeat(4,1fr); gap:clamp(20px,2.4vw,32px); }
@media (max-width:960px){ .grid-3{ grid-template-columns:1fr 1fr; } .grid-4{ grid-template-columns:1fr 1fr; } }
@media (max-width:640px){ .grid-2,.grid-3,.grid-4{ grid-template-columns:1fr; } }

.section-head{
  display:flex; justify-content:space-between; align-items:flex-end; gap:40px;
  margin-bottom:clamp(32px,5vw,64px);
}
.section-head .lede{ margin:0; }
@media (max-width:720px){ .section-head{ flex-direction:column; align-items:flex-start; gap:16px; } }

/* ---------- Project cards ---------- */
.project-card{
  display:block; position:relative; overflow:hidden; background:var(--anthracite);
}
.project-card .thumb{ aspect-ratio:4/3; overflow:hidden; }
.project-card img{
  width:100%; height:100%; object-fit:cover;
  transition:transform .7s var(--ease);
}
.project-card:hover img{ transform:scale(1.06); }
.project-card .info{
  padding:22px 4px 4px;
}
.project-card .info .cat{
  font-size:.72rem; letter-spacing:.14em; text-transform:uppercase; color:var(--or); font-weight:600;
}
.project-card .info h3{ margin-top:.35em; }
.project-card .info .loc{ color:var(--gris); font-size:.9rem; margin-top:.3em; display:block; }
.project-card .view{
  margin-top:1em; font-size:.82rem; letter-spacing:.05em; color:var(--anthracite);
  display:inline-flex; align-items:center; gap:.5em; border-bottom:1px solid var(--anthracite);
  padding-bottom:2px;
}

.projects-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:clamp(28px,3vw,48px); }
@media (max-width:960px){ .projects-grid{ grid-template-columns:1fr 1fr; } }
@media (max-width:640px){ .projects-grid{ grid-template-columns:1fr; } }

.filters{ display:flex; flex-wrap:wrap; gap:10px; margin-bottom:44px; }
.filters button{
  border:1px solid rgba(43,40,35,.25); background:transparent; color:var(--anthracite);
  padding:.5em 1.1em; font-size:.82rem; letter-spacing:.03em;
  transition:all .25s var(--ease);
}
.filters button.active, .filters button:hover{ background:var(--noir); border-color:var(--noir); color:var(--blanc-casse); }

/* ---------- Timeline ---------- */
.timeline{ position:relative; margin-top:20px; }
.timeline::before{
  content:''; position:absolute; left:0; top:6px; bottom:6px; width:1px;
  background:rgba(43,40,35,.2);
}
.timeline-item{
  position:relative; padding:0 0 44px 34px;
}
.timeline-item::before{
  content:''; position:absolute; left:-4px; top:6px; width:9px; height:9px;
  background:var(--or); border-radius:50%;
}
.timeline-item .period{ font-size:.8rem; letter-spacing:.06em; text-transform:uppercase; color:var(--or); font-weight:600; }
.timeline-item h4{ margin-top:.4em; }
.timeline-item .org{ color:var(--gris); font-size:.92rem; margin-top:.15em; }
.timeline-item .desc{ margin-top:.6em; color:var(--anthracite); max-width:60ch; }

/* ---------- Expertise ---------- */
.expertise-item{
  border-top:1px solid rgba(43,40,35,.15);
  padding:34px 0;
  display:grid; grid-template-columns:80px 1fr; gap:24px;
}
.expertise-item:last-child{ border-bottom:1px solid rgba(43,40,35,.15); }
.expertise-item .num{ font-family:var(--font-serif); font-size:1.6rem; color:var(--or); }
.expertise-item p{ color:var(--gris); margin-top:.5em; max-width:62ch; }
@media (max-width:600px){ .expertise-item{ grid-template-columns:1fr; gap:8px; } }

/* ---------- Methodology steps ---------- */
.steps{ display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:rgba(43,40,35,.15); border:1px solid rgba(43,40,35,.15); margin-top:20px;}
.step{ background:var(--blanc-casse); padding:32px 26px; }
.step .num{ font-family:var(--font-serif); color:var(--or); font-size:1.4rem; }
.step h4{ margin-top:.6em; }
.step p{ margin-top:.5em; color:var(--gris); font-size:.92rem; }
@media (max-width:900px){ .steps{ grid-template-columns:1fr 1fr; } }
@media (max-width:560px){ .steps{ grid-template-columns:1fr; } }

/* ---------- About split ---------- */
.about-split{ display:grid; grid-template-columns:.9fr 1.1fr; gap:clamp(32px,5vw,80px); align-items:start; }
@media (max-width:880px){ .about-split{ grid-template-columns:1fr; } }
.chip-list{ display:flex; flex-wrap:wrap; gap:10px; margin-top:24px; }
.chip{ border:1px solid rgba(43,40,35,.25); padding:.5em 1em; font-size:.82rem; color:var(--anthracite); }

/* ---------- Contact ---------- */
.contact-grid{ display:grid; grid-template-columns:1fr 1fr; gap:clamp(32px,5vw,72px); }
@media (max-width:880px){ .contact-grid{ grid-template-columns:1fr; } }
.field{ margin-bottom:20px; }
.field label{ display:block; font-size:.82rem; letter-spacing:.03em; color:var(--gris); margin-bottom:.5em; }
.field input, .field select, .field textarea{
  width:100%; border:0; border-bottom:1px solid rgba(43,40,35,.3);
  background:transparent; padding:.7em 0; color:var(--noir);
  transition:border-color .25s var(--ease);
}
.field input:focus, .field select:focus, .field textarea:focus{
  outline:none; border-color:var(--or);
}
.contact-info-item{ padding:20px 0; border-top:1px solid rgba(43,40,35,.15); }
.contact-info-item:last-child{ border-bottom:1px solid rgba(43,40,35,.15); }
.contact-info-item .label{ font-size:.75rem; letter-spacing:.1em; text-transform:uppercase; color:var(--or); font-weight:600; }
.contact-info-item .value{ margin-top:.3em; font-family:var(--font-serif); font-size:1.15rem; }

/* ---------- Footer ---------- */
.site-footer{ background:var(--noir); color:var(--gris-clair); padding:clamp(50px,7vw,90px) 0 30px; }
.footer-top{ display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:40px; padding-bottom:50px; border-bottom:1px solid rgba(255,255,255,.1); }
.footer-top h4{ color:var(--blanc-casse); font-size:.8rem; letter-spacing:.1em; text-transform:uppercase; margin-bottom:1.2em; font-family:var(--font-sans); font-weight:600; }
.footer-top a, .footer-top p{ display:block; color:var(--gris-clair); font-size:.92rem; margin-bottom:.7em; }
.footer-top a:hover{ color:var(--or-clair); }
.footer-brand p{ color:var(--gris-clair); max-width:32ch; margin-top:1em; }
.footer-bottom{ display:flex; justify-content:space-between; padding-top:26px; font-size:.8rem; color:var(--gris); flex-wrap:wrap; gap:10px; }
@media (max-width:820px){ .footer-top{ grid-template-columns:1fr 1fr; } }
@media (max-width:520px){ .footer-top{ grid-template-columns:1fr; } }

/* ---------- Lightbox ---------- */
.lightbox{
  position:fixed; inset:0; background:rgba(21,19,15,.94); z-index:500;
  display:none; align-items:center; justify-content:center; padding:5vw;
}
.lightbox.is-open{ display:flex; }
.lightbox img{ max-width:100%; max-height:88vh; margin:0 auto; }
.lightbox-close{
  position:absolute; top:24px; right:28px; background:none; border:0; color:var(--blanc-casse);
  font-size:1.8rem; line-height:1;
}

/* ---------- Detail page ---------- */
.detail-hero{ position:relative; height:64vh; min-height:420px; overflow:hidden; }
.detail-hero img{ width:100%; height:100%; object-fit:cover; }
.detail-hero-overlay{
  position:absolute; inset:0; background:linear-gradient(0deg, rgba(21,19,15,.75) 5%, rgba(21,19,15,0) 55%);
  display:flex; align-items:flex-end;
}
.detail-hero-copy{ padding:clamp(24px,5vw,60px); color:var(--blanc-casse); }
.detail-hero-copy .cat{ font-size:.78rem; letter-spacing:.16em; text-transform:uppercase; color:var(--or-clair); font-weight:600; }
.detail-hero-copy h1{ color:var(--blanc-casse); margin-top:.3em; max-width:16ch; }
.detail-hero-copy .loc{ margin-top:.5em; color:var(--gris-clair); font-size:1rem; }

.detail-meta{ display:grid; grid-template-columns:repeat(4,1fr); gap:24px; padding:36px 0; border-bottom:1px solid rgba(43,40,35,.15); }
.detail-meta .m-label{ font-size:.72rem; letter-spacing:.1em; text-transform:uppercase; color:var(--or); font-weight:600; }
.detail-meta .m-value{ margin-top:.4em; font-family:var(--font-serif); font-size:1.1rem; }
@media (max-width:760px){ .detail-meta{ grid-template-columns:1fr 1fr; } }

.gallery{ display:grid; grid-template-columns:repeat(2,1fr); gap:18px; margin-top:20px; }
.gallery figure{ margin:0; cursor:zoom-in; overflow:hidden; }
.gallery img{ width:100%; height:100%; object-fit:cover; transition:transform .6s var(--ease); }
.gallery figure:hover img{ transform:scale(1.04); }
.gallery figcaption{ font-size:.82rem; color:var(--gris); margin-top:.6em; }
@media (max-width:700px){ .gallery{ grid-template-columns:1fr; } }

.project-nav{ display:flex; justify-content:space-between; padding:44px 0; border-top:1px solid rgba(43,40,35,.15); }
.project-nav a{ font-size:.82rem; letter-spacing:.05em; text-transform:uppercase; display:flex; flex-direction:column; gap:6px; }
.project-nav .dir{ color:var(--or); font-weight:600; }
.project-nav .title{ font-family:var(--font-serif); font-size:1.2rem; text-transform:none; letter-spacing:0; color:var(--noir); }
.project-nav .next{ text-align:right; align-items:flex-end; }

/* ---------- Pack / ressources ---------- */
.pack-card{ border:1px solid rgba(43,40,35,.18); padding:clamp(30px,4vw,56px); display:grid; grid-template-columns:1fr auto; gap:40px; align-items:center; }
.pack-price{ font-family:var(--font-serif); font-size:2.2rem; white-space:nowrap; }
.pack-price span{ font-size:.9rem; color:var(--gris); font-family:var(--font-sans); display:block; margin-top:.2em; }
@media (max-width:700px){ .pack-card{ grid-template-columns:1fr; text-align:left; } }
.folder-list{ margin-top:32px; display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.folder-list li{ border-left:2px solid var(--or); padding:10px 0 10px 16px; font-size:.92rem; color:var(--anthracite); }
@media (max-width:640px){ .folder-list{ grid-template-columns:1fr; } }

/* ---------- misc ---------- */
.mt-lg{ margin-top:clamp(40px,6vw,80px); }
.text-center{ text-align:center; margin-left:auto; margin-right:auto; }
.divider{ height:1px; background:rgba(43,40,35,.15); border:0; margin:0; }
.tag-strip{ display:flex; gap:10px; flex-wrap:wrap; margin-top:1.4em; }
.tag-strip span{ font-size:.78rem; letter-spacing:.05em; text-transform:uppercase; color:var(--gris); border:1px solid rgba(43,40,35,.2); padding:.4em .9em; }