/* =========================================================
   ARM BATIMENTS — design tokens
   Palette:
     --charcoal   #171613  (texte principal, header/footer)
     --paper      #EDE9E1  (fond, papier béton)
     --paper-dark #DCD6C9  (fond alterné / bordures)
     --amber      #DE9F2E  (accent CTA, "orange de chantier")
     --blueprint  #2B4257  (bleu plan / liens secondaires)
     --ink-muted  #625F57  (texte secondaire)
   Type:
     Display : "Space Grotesk"  (titres)
     Body    : "IBM Plex Sans"  (texte courant)
     Mono    : "IBM Plex Mono"  (eyebrows, labels, chiffres)
   ========================================================= */

:root{
  --charcoal:#171613;
  --paper:#EDE9E1;
  --paper-dark:#DCD6C9;
  --amber:#DE9F2E;
  --amber-dark:#C0821E;
  --blueprint:#2B4257;
  --ink-muted:#625F57;
  --white:#FBFAF7;

  --font-display:'Space Grotesk', sans-serif;
  --font-body:'IBM Plex Sans', sans-serif;
  --font-mono:'IBM Plex Mono', monospace;

  --container: 1180px;
  --radius: 2px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }

body{
  margin:0;
  font-family:var(--font-body);
  color:var(--charcoal);
  background:var(--paper);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.12;
  margin:0 0 .5em;
  letter-spacing:-0.01em;
}

h2{ font-size:clamp(1.7rem, 3vw, 2.4rem); }
h3{ font-size:1.15rem; }

ul{
  margin:0;
  padding:0;
  list-style:none;
}

p{ margin:0 0 1em; color:var(--charcoal); }

a{ color:inherit; text-decoration:none; }

img,svg{ display:block; max-width:100%; }

.container{
  max-width:var(--container);
  margin:0 auto;
  padding:0 28px;
}

.eyebrow-mono{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--blueprint);
  margin:0 0 .6em;
  display:block;
}

/* ================= buttons ================= */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5em;
  font-family:var(--font-body);
  font-weight:600;
  font-size:.95rem;
  padding:.85em 1.6em;
  border-radius:var(--radius);
  border:1.5px solid transparent;
  cursor:pointer;
  transition:transform .15s ease, background-color .15s ease, border-color .15s ease, color .15s ease;
  white-space:nowrap;
}
.btn:active{ transform:translateY(1px); }

.btn-primary{
  background:var(--amber);
  color:var(--charcoal);
  border-color:var(--amber);
}
.btn-primary:hover{ background:var(--amber-dark); border-color:var(--amber-dark); }

.btn-ghost{
  background:transparent;
  color:var(--charcoal);
  border-color:var(--charcoal);
}
.btn-ghost:hover{ background:var(--charcoal); color:var(--paper); }

.btn-small{ padding:.6em 1.2em; font-size:.85rem; }
.btn-full{ width:100%; }

/* ================= corner ticks ================= */
.corner-tick{
  position:absolute;
  width:22px;
  height:22px;
  pointer-events:none;
  z-index:2;
}
.corner-tick.small{ 
  width:16px; 
  height:16px; 
}

.tick-tl{ top:16px; left:16px; border-top:1.5px solid var(--blueprint); border-left:1.5px solid var(--blueprint); }
.tick-tr{ top:16px; right:16px; border-top:1.5px solid var(--blueprint); border-right:1.5px solid var(--blueprint); }
.tick-bl{ bottom:16px; left:16px; border-bottom:1.5px solid var(--blueprint); border-left:1.5px solid var(--blueprint); }
.tick-br{ bottom:16px; right:16px; border-bottom:1.5px solid var(--blueprint); border-right:1.5px solid var(--blueprint); }

/* ================= HEADER ================= */
.header{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(237,233,225,.92);
  backdrop-filter:blur(6px);
  border-bottom:1px solid var(--paper-dark);
}
.header__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  padding-top:14px;
  padding-bottom:14px;
}

.header__right{ 
  display:flex; 
  align-items:center; 
  gap:18px; 
}

.header__phone{
  font-family:var(--font-mono);
  font-size:.85rem;
  display:none;
}
.header__phone .eyebrow-mono{ 
  display:inline; 
  margin:0; 
}

/* ================= LOGO ================= */
.logo{ 
  display:flex; 
  align-items:center; gap:10px; 
  align-self:flex-start;
}
.logo__inner{ 
  color:var(--amber); 
  width:126px; 
  flex-shrink:0; 
}
.logo__image{ 
  width:100%; 
  height:100%; 
  user-select:none;
  pointer-events:none;
}

/* ================= NAV ================= */
.nav__list{ 
  display:flex; 
  gap:28px; 
}
.nav__link{
  font-size:.92rem;
  font-weight:500;
  position:relative;
  padding-bottom:2px;
}
.nav__link::after{
  content:'';
  position:absolute; left:0; bottom:-2px;
  width:0; height:1.5px; background:var(--amber);
  transition:width .2s ease;
}
.nav__link:hover::after{
  width:100%; 
}

.nav__toggle{
  display:none;
  flex-direction:column;
  justify-content:center;
  gap:5px;
  width:32px; height:32px;
  background:none; 
  border:none; 
  cursor:pointer;
  padding:0;
}
.nav__toggle span{
  display:block; height:2px; width:100%;
  background:var(--charcoal);
  transition:transform .2s ease, opacity .2s ease;
}

/* ================= BLUEPRINT ================= */

.blueprint{
  position:absolute; 
  inset:0;
  background-image:
    linear-gradient(var(--paper-dark) 1px, transparent 1px),
    linear-gradient(90deg, var(--paper-dark) 1px, transparent 1px);
  background-size:44px 44px;
  opacity:.5;
  mask-image:radial-gradient(ellipse at 60% 20%, black 10%, transparent 70%);
}

/* ================= HERO ================= */
.hero{
  position:relative;
  overflow:hidden;
  padding:72px 0 96px;
  border-bottom:1px solid var(--paper-dark);
}

.hero__inner{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:1.1fr .9fr;
  gap:48px;
  align-items:center;
}

.hero__label{ 
  margin-bottom: 1em; 
}
.hero__title{ 
  font-size:clamp(2.3rem, 5vw, 3.6rem); 
}
.hero__title--accent{ 
  color:var(--amber); 
}
.hero__subtitle{
  max-width:46ch;
  color:var(--ink-muted);
  font-size:1.05rem;
}
.hero__buttons{ 
  display:flex; 
  gap:14px; 
  flex-wrap:wrap; 
  margin:1.6em 0 2.2em; 
}

.hero__stats{
  display:flex;
  gap:40px;
  margin:0;
  padding-top:1.6em;
  border-top:1px solid var(--paper-dark);
}
.hero__stat dt{ 
  margin-bottom:.3em; 
}
.hero__stat dd{ 
  margin:0; 
  font-weight:600; 
  font-family:var(--font-display); 
}

.hero__photo{
  position:relative;
  aspect-ratio: 6 / 5;
  overflow:hidden;
  background:var(--paper-dark);
  border:1px solid var(--paper-dark);
}
.hero__img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
  filter:grayscale(12%) contrast(1.04) saturate(1.05);
  transition:filter .3s ease, transform .4s ease;
}
.hero__photo:hover .hero__img{
  filter:grayscale(0%) contrast(1.04) saturate(1.1);
  transform:scale(1.02);
}
.hero__photo::before{
  content:'';
  position:absolute;
  inset:auto 0 0 0;
  height:40%;
  background:linear-gradient(to top, rgba(23,22,19,.55), transparent);
  pointer-events:none;
}
.hero__photo::after{
  content:'';
  position:absolute;
  top:0; left:0; right:0;
  height:3px;
  background:var(--amber);
}
.hero__caption{
  position:absolute;
  left:16px; bottom:14px;
  margin:0;
  color:var(--paper);
  z-index:1;
}


/* ================= SECTIONS ================= */
.section{ 
  padding:88px 0; 
}
.section__alt{ 
  background:var(--white); 
  border-top:1px solid var(--paper-dark); 
  border-bottom:1px solid var(--paper-dark); 
}

.section__head{ 
  max-width:640px; 
  margin:0 auto 52px; 
  text-align:left; 
}
.section__head h2{ 
  margin:0; 
}

/* ================= SERVICES ================= */
.service{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:1px;
  background:var(--paper-dark);
  border:1px solid var(--paper-dark);
}
.service__card{
  background:var(--paper);
  padding:34px 30px;
  transition:background-color .2s ease;
}
.service__card:hover{ 
  background:var(--white); 
}
.service__icon{ 
  width:38px; 
  height:38px; 
  color:var(--blueprint); 
  margin-bottom:18px; 
}
.service__card h3{ 
  margin-bottom:.5em; 
}
.service__card p{ 
  color:var(--ink-muted); 
  font-size:.94rem; 
  margin:0; 
}

/* ================= REALISATIONS ================= */

/* ---------- galerie réalisations ---------- */
.realisations__grid{
  display:grid;
  grid-template-columns:repeat(4, 1fr);
  gap:1px;
  background:var(--paper-dark);
  border:1px solid var(--paper-dark);
}
.realisations__item{
  position:relative;
  aspect-ratio:1 / 1;
  overflow:hidden;
  border:none;
  padding:0;
  margin:0;
  cursor:pointer;
  background:var(--paper-dark);
}
.realisations__item img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
  filter:grayscale(10%) contrast(1.03);
  transition:transform .4s ease, filter .3s ease;
}
.realisations__overlay{
  position:absolute;
  inset:0;
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--paper);
  background:rgba(23,22,19,0);
  opacity:0;
  transition:opacity .25s ease, background-color .25s ease;
  letter-spacing:.18em;
}
.realisations__item:hover img,
.realisations__item:focus-visible img{
  transform:scale(1.06);
  filter:grayscale(0%) contrast(1.03);
}
.realisations__item:hover .realisations__overlay,
.realisations__item:focus-visible .realisations__overlay{
  opacity:1;
  background:rgba(23,22,19,.45);
}
.realisations__item:focus-visible{ outline:2px solid var(--amber); outline-offset:-2px; }

/* ================= LIGHTBOX ================= */
.lightbox{
  position:fixed;
  inset:0;
  z-index:200;
  background:rgba(23,22,19,.94);
  display:flex;
  align-items:center;
  justify-content:center;
  opacity:0;
  visibility:hidden;
  transition:opacity .25s ease;
}
.lightbox.open{ opacity:1; visibility:visible; }

.lightbox__figure{
  margin:0;
  max-width:88vw;
  max-height:86vh;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:14px;
}
.lightbox__figure img{
  max-width:88vw;
  max-height:78vh;
  width:auto;
  height:auto;
  object-fit:contain;
  border:1px solid rgba(237,233,225,.15);
}
.lightbox__figure figcaption{
  color:var(--paper);
  opacity:.75;
}

.lightbox__close{
  position:absolute;
  top:22px; right:26px;
  background:none;
  border:1.5px solid rgba(237,233,225,.4);
  color:var(--paper);
  width:40px; height:40px;
  font-size:1.1rem;
  cursor:pointer;
  transition:border-color .15s ease, color .15s ease;
}
.lightbox__close:hover{ border-color:var(--amber); color:var(--amber); }

.lightbox__nav{
  position:absolute;
  top:50%;
  transform:translateY(-50%);
  background:none;
  border:1.5px solid rgba(237,233,225,.4);
  color:var(--paper);
  width:44px; height:44px;
  font-size:1.2rem;
  cursor:pointer;
  transition:border-color .15s ease, color .15s ease;
}
.lightbox__nav:hover{ border-color:var(--amber); color:var(--amber); }
.lightbox__prev{ left:22px; }
.lightbox__next{ right:22px; }

/* ================= PROCESS ================= */
.process{
  display:flex;
  align-items:flex-start;
  gap:0;
}
.process__step{ 
  flex:1; 
}
.process__num{
  font-size:1.6rem;
  color:var(--amber);
  margin-bottom:.3em;
}
.process__step p{ 
  color:var(--ink-muted); 
  font-size:.94rem; 
}
.process__connector{
  width:60px;
  height:1px;
  background:var(--paper-dark);
  margin-top:34px;
  position:relative;
  flex-shrink:0;
}
.process__connector::before,.process__connector::after{
  content:'';
  position:absolute;
  top:-4px;
  width:1px; height:9px;
  background:var(--paper-dark);
}
.process__connector::before{ 
  left:0; 
}
.process__connector::after{
  right:0; 
}

/* ================= CONTACT / FORM ================= */
.contact__wrap{
  display:grid;
  grid-template-columns:.9fr 1.1fr;
  gap:56px;
  align-items:start;
}
.contact__lead{ 
  color:var(--ink-muted); 
  max-width:44ch; 
}

.contact__list{
  list-style:none;
  margin:2em 0 0;
  padding:1.6em 0 0;
  border-top:1px solid var(--paper-dark);
  display:flex;
  flex-direction:column;
  gap:1.1em;
}
.contact__list li{ 
  display:flex; 
  flex-direction:column; 
  gap:.2em; 
}
.contact__list a{ 
  font-weight:500; 
}
.contact__list a:hover{ 
  color:var(--blueprint); 
}

.form{
  position:relative;
  background:var(--white);
  border:1px solid var(--paper-dark);
  padding:38px;
}

.form__row{ 
  margin-bottom:20px; 
}
.form__row-split{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:18px;
}
label{
  display:block;
  font-size:.85rem;
  font-weight:600;
  margin-bottom:.5em;
}
.req{ 
  color:var(--amber-dark); 
}

input[type="text"], input[type="email"], input[type="tel"], select, textarea{
  width:100%;
  font-family:var(--font-body);
  font-size:.95rem;
  padding:.75em .85em;
  border:1.5px solid var(--paper-dark);
  border-radius:var(--radius);
  background:var(--paper);
  color:var(--charcoal);
  transition:border-color .15s ease, background-color .15s ease;
}
textarea{ 
  resize:vertical; 
  min-height:110px; 
  max-height:300px;
}
input:focus, select:focus, textarea:focus{
  outline:none;
  border-color:var(--blueprint);
  background:var(--white);
}
input:invalid:not(:placeholder-shown){ 
  border-color:#B4462F; 
}

.form__honeypot{ 
  position:absolute; 
  left:-9999px; 
  top:-9999px; 
}

.form__note{
  font-size:.78rem;
  color:var(--ink-muted);
  margin:14px 0 0;
}
.form__feedback{
  margin-top:16px;
  font-size:.9rem;
  font-weight:500;
  min-height:1.4em;
}
.form__feedback.success{ 
  color:#2E6B3E; 
}
.form__feedback.error{ 
  color:#B4462F; 
}

/* ================= FOOTER ================= */
.footer{
  background:var(--charcoal);
  color:var(--paper);
  padding-top:64px;
}
.footer__inner{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr;
  gap:40px;
  padding-bottom:48px;
  border-bottom:1px solid rgba(237,233,225,.15);
}

.footer__tagline{ 
  color:rgba(237,233,225,.65); 
  font-size:.92rem; 
  margin-top:14px; 
}

.footer__col{ 
  display:flex; 
  flex-direction:column; 
  gap:10px; 
}
.footer__heading{ 
  color:var(--amber); 
  margin-bottom:.4em; 
}
.footer__col a, .footer__col span{ 
  color:rgba(237,233,225,.8); 
  font-size:.92rem; 
}
.footer__col a:hover{ 
  color:var(--amber); 
}

.footer__bottom{
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:10px;
  padding:22px;
  font-size:.78rem;
  font-family:var(--font-mono);
  color:rgba(237,233,225,.5);
}

/* ================= RESPONSIVE ================= */
@media (min-width:781px){
  .header__phone{ 
    display:inline-flex; 
    align-items:center; 
    gap:.4em; 
  }
}

@media (max-width:980px){
  .hero__inner{ grid-template-columns:1fr; }
  .hero__photo{ 
    order:-1; 
    max-width:420px; 
    margin:0 auto; 
  }
  .contact__wrap{ 
    grid-template-columns:1fr; 
  }
  .service{ 
    grid-template-columns:repeat(2,1fr); 
  }
  .realisations__grid{ 
    grid-template-columns:repeat(3, 1fr); 
  }
  .header__devis{ 
    display:none; 
  }
  .logo__inner{ 
    width:100px; 
  }
}

@media (max-width:780px){
  .nav{
    position:absolute;
    top:100%; left:0; right:0;
    background:var(--paper);
    border-bottom:1px solid var(--paper-dark);
    flex-direction:column;
    padding:16px 28px 24px;
    gap:16px;
    display:none;
  }
  .nav__list{ 
    flex-direction:column; gap:16px; 
  }
  .nav.open{ 
    display:flex; 
  }
  .nav__toggle{ 
    display:flex; 
  }
  .btn-small{ 
    display:none; 
  }

  .process{ 
    flex-direction:column; 
    gap:28px; 
  }
  .process__connector{
    display:none; 
    }
  .service{ 
    grid-template-columns:1fr; 
  }
  .form__row-split{ 
    grid-template-columns:1fr; 
    gap:0; 
  }
  .footer__inner{ 
    grid-template-columns:1fr; 
    gap:32px; 
  }
  .section{ 
    padding:64px 0; 
  }
  .realisations__grid{ 
    grid-template-columns:repeat(2, 1fr); 
  }
  .lightbox__nav{ 
    width:38px; height:38px; font-size:1rem; 
  }
  .lightbox__close{ 
    top:14px; right:14px; 
  }
}

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  .draw-line{ animation:none; stroke-dashoffset:0; }
  .main-nav a::after{ transition:none; }
}