/* =========================================================================
   SD COUVERTURE — Design System
   Thèse : la ligne de toit. Dominante ardoise/zinc, accent tuile.
   ========================================================================= */

/* ---------- Tokens ---------- */
:root {
  /* Couleur — dérivée des matériaux du métier */
  --slate-900:#16212B;
  --slate-800:#1E2D3A;
  --slate-700:#2C4150;
  --zinc-600:#4A5C69;
  --zinc-500:#5E7180;
  --zinc-400:#7E8E99;
  --zinc-300:#9FB0BC;
  --zinc-200:#C4CED4;
  --zinc-100:#E3E8EB;
  --paper:#EFF1F2;
  --paper-2:#E7EBED;
  --ink:#14202A;
  --tuile:#B0481F;
  --tuile-700:#974019;
  --tuile-300:#D86B3E;
  --white:#FFFFFF;

  /* Typo */
  --font-display:"Bricolage Grotesque", system-ui, sans-serif;
  --font-body:"Hanken Grotesk", system-ui, sans-serif;
  --font-mono:"Spline Sans Mono", ui-monospace, monospace;

  /* Échelle d'espace */
  --s1:.25rem; --s2:.5rem; --s3:.75rem; --s4:1rem; --s5:1.5rem;
  --s6:2rem; --s7:3rem; --s8:4rem; --s9:6rem; --s10:8rem;
  --section-y:clamp(3.5rem, 8vw, 7rem);

  /* Rayons */
  --r-sm:6px; --r-md:12px; --r-lg:20px; --r-pill:999px;

  /* Ombres */
  --shadow-1:0 1px 2px rgba(20,32,42,.06), 0 4px 16px rgba(20,32,42,.05);
  --shadow-2:0 12px 40px rgba(20,32,42,.14);
  --shadow-dark:0 18px 50px rgba(0,0,0,.35);

  /* Motion + signature */
  --ease:cubic-bezier(.2,.7,.2,1);
  --t-fast:180ms; --t-mid:360ms; --t-slow:700ms;
  --pitch:17deg;

  --maxw:1240px;
  --gutter:clamp(1.25rem, 4vw, 3rem);
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
*{margin:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  font-family:var(--font-body);
  font-size:1.0625rem;
  line-height:1.7;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
ul[role="list"]{list-style:none;padding:0}
:focus-visible{outline:3px solid var(--tuile-300);outline-offset:3px;border-radius:3px}
.ico{width:1.4em;height:1.4em;flex:none;vertical-align:middle}

/* ---------- Typo ---------- */
h1,h2,h3,h4{font-family:var(--font-display);font-weight:600;line-height:1.06;letter-spacing:-.02em;color:var(--slate-900)}
h1{font-size:clamp(2.6rem,6.5vw,5.4rem);font-weight:700;letter-spacing:-.035em}
h2{font-size:clamp(2rem,4vw,3.3rem)}
h3{font-size:clamp(1.25rem,2.2vw,1.7rem)}
h4{font-size:1.15rem}
p{max-width:64ch}
strong{font-weight:700}

.eyebrow{
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--tuile);
  font-weight:500;
  display:inline-flex;align-items:center;gap:.6rem;
}
.eyebrow::before{
  content:"";width:1.6rem;height:2px;background:var(--tuile);
  transform:skewY(calc(-1 * var(--pitch)));transform-origin:left;
}
.eyebrow--light{color:var(--tuile-300)}
.eyebrow--light::before{background:var(--tuile-300)}

.lead{font-size:clamp(1.1rem,1.6vw,1.3rem);line-height:1.6;color:var(--zinc-600)}
.mono{font-family:var(--font-mono);letter-spacing:.02em}

/* ---------- Layout ---------- */
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:var(--section-y)}
.section--slate{background:var(--slate-900);color:var(--zinc-100)}
.section--slate h2,.section--slate h3{color:var(--white)}
.section--paper2{background:var(--paper-2)}
.stack>*+*{margin-top:var(--s4)}
.grid{display:grid;gap:clamp(1.25rem,2.5vw,2rem)}
.skip-link{position:absolute;left:.75rem;top:-3rem;background:var(--slate-900);color:#fff;padding:.6rem 1rem;border-radius:var(--r-sm);z-index:200;transition:top var(--t-fast)}
.skip-link:focus{top:.75rem}
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- Boutons ---------- */
.btn{
  --bg:var(--tuile);--fg:#fff;
  display:inline-flex;align-items:center;gap:.6rem;
  background:var(--bg);color:var(--fg);
  font-family:var(--font-body);font-weight:600;font-size:1rem;
  padding:.95rem 1.6rem;border:0;border-radius:var(--r-sm);
  cursor:pointer;transition:transform var(--t-fast) var(--ease),background var(--t-fast),box-shadow var(--t-fast);
  box-shadow:var(--shadow-1);
}
.btn:hover{background:var(--tuile-700);transform:translateY(-2px);box-shadow:var(--shadow-2)}
.btn:active{transform:translateY(0)}
.btn .arrow{transition:transform var(--t-fast) var(--ease)}
.btn:hover .arrow{transform:translateX(4px)}
.btn--ghost{--bg:transparent;--fg:var(--slate-900);box-shadow:inset 0 0 0 1.5px var(--zinc-300)}
.btn--ghost:hover{--bg:var(--slate-900);--fg:#fff;box-shadow:inset 0 0 0 1.5px var(--slate-900)}
.btn--ghost-light{--bg:transparent;--fg:#fff;box-shadow:inset 0 0 0 1.5px rgba(255,255,255,.4)}
.btn--ghost-light:hover{--bg:#fff;--fg:var(--slate-900);box-shadow:inset 0 0 0 1.5px #fff}
.btn--light{--bg:#fff;--fg:var(--slate-900)}
.btn--light:hover{--bg:var(--zinc-100);background:var(--zinc-100)}
.btn--lg{padding:1.1rem 2rem;font-size:1.05rem}

.linkarrow{display:inline-flex;align-items:center;gap:.45rem;font-weight:600;color:var(--tuile);font-family:var(--font-body)}
.linkarrow .arrow{transition:transform var(--t-fast) var(--ease)}
.linkarrow:hover .arrow{transform:translateX(4px)}

/* ---------- Header ---------- */
.topbar{background:var(--slate-900);color:var(--zinc-200);font-size:.85rem}
.topbar .wrap{display:flex;gap:1.5rem;align-items:center;justify-content:space-between;padding-block:.5rem;flex-wrap:wrap}
.topbar a{display:inline-flex;align-items:center;gap:.45rem;color:#fff;font-family:var(--font-mono);letter-spacing:.02em}
.topbar a:hover{color:var(--tuile-300)}
.topbar .urgence{color:var(--tuile-300);font-weight:500}

.site-header{position:sticky;top:0;z-index:100;background:rgba(239,241,242,.86);backdrop-filter:blur(10px);border-bottom:1px solid var(--zinc-100);transition:box-shadow var(--t-fast)}
.site-header.scrolled{box-shadow:var(--shadow-1)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding-block:.85rem}
.brand{display:inline-flex;align-items:center;gap:.7rem;font-family:var(--font-display);font-weight:700;font-size:1.25rem;color:var(--slate-900);letter-spacing:-.02em}
.brand .mark{width:34px;height:34px;flex:none}
.brand small{display:block;font-family:var(--font-mono);font-weight:400;font-size:.62rem;letter-spacing:.18em;color:var(--zinc-600);text-transform:uppercase;margin-top:1px}

.nav{display:flex;align-items:center;gap:.25rem}
.nav a{padding:.5rem .8rem;border-radius:var(--r-sm);font-weight:500;font-size:.97rem;color:var(--slate-800);transition:background var(--t-fast),color var(--t-fast)}
.nav a:hover{background:var(--zinc-100)}
.nav a[aria-current="page"]{color:var(--tuile)}
.header-cta{display:flex;align-items:center;gap:.75rem}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:.5rem}
.nav-toggle svg{width:26px;height:26px}
/* L'aside mobile et le voile sont masqués hors mobile */
.site-nav{display:none}
.nav-backdrop{display:none}

@media (max-width:1024px){
  .nav,.header-cta .btn{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{position:fixed;inset:0 0 0 auto;width:min(86vw,360px);background:var(--slate-900);transform:translateX(100%);transition:transform var(--t-mid) var(--ease);z-index:120;padding:5rem 1.5rem 2rem;display:flex;flex-direction:column;gap:.25rem}
  .site-nav{display:flex}
  .nav-backdrop{display:block}
  .site-nav.open{transform:translateX(0)}
  .site-nav .nav{flex-direction:column;align-items:stretch;gap:.2rem}
  .site-nav .nav a{color:#fff;font-size:1.15rem;padding:.85rem 1rem}
  .site-nav .nav a:hover{background:var(--slate-700)}
  .site-nav .btn{display:inline-flex;margin-top:1rem;justify-content:center}
  .nav-close{position:absolute;top:1.25rem;right:1.25rem;background:none;border:0;color:#fff;cursor:pointer}
  .nav-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.45);opacity:0;visibility:hidden;transition:opacity var(--t-mid);z-index:110}
  .nav-backdrop.open{opacity:1;visibility:visible}
}

/* ---------- Hero ---------- */
.hero{position:relative;background:var(--slate-900);color:#fff;overflow:hidden;isolation:isolate}
.hero__media{position:absolute;inset:0;z-index:-2}
.hero__media img{width:100%;height:100%;object-fit:cover;opacity:.42}
.hero__media::after{content:"";position:absolute;inset:0;background:linear-gradient(110deg,var(--slate-900) 18%,rgba(22,33,43,.72) 55%,rgba(22,33,43,.45))}
.hero__ridge{position:absolute;inset:0;z-index:-1;width:100%;height:100%;pointer-events:none}
.hero__ridge path{fill:none;stroke:var(--tuile-300);stroke-width:1.4;opacity:.6;stroke-dasharray:1600;stroke-dashoffset:1600;animation:draw 2.4s var(--ease) .3s forwards}
.hero .wrap{position:relative;padding-block:clamp(4.5rem,12vw,9rem) clamp(4rem,9vw,7rem);min-height:min(86vh,760px);display:flex;flex-direction:column;justify-content:center}
.hero h1{color:#fff;max-width:16ch}
.hero h1 .accent{color:var(--tuile-300)}
.hero__lead{margin-top:1.5rem;max-width:52ch;color:var(--zinc-200);font-size:clamp(1.1rem,1.6vw,1.33rem)}
.hero__cta{margin-top:2.25rem;display:flex;gap:1rem;flex-wrap:wrap}
.hero__meta{margin-top:2.75rem;display:flex;gap:2rem;flex-wrap:wrap;font-family:var(--font-mono);font-size:.82rem;color:var(--zinc-300);letter-spacing:.04em}
.hero__meta b{display:block;font-family:var(--font-display);font-size:1.9rem;color:#fff;font-weight:700;letter-spacing:-.02em;line-height:1}
.hero__meta span{display:inline-block;border-left:2px solid var(--tuile);padding-left:1rem}
/* bord bas en pente — la signature */
.hero::before{content:"";position:absolute;left:0;right:0;bottom:-1px;height:7vw;max-height:90px;background:var(--paper);clip-path:polygon(0 100%,100% 0,100% 100%);z-index:1}

@keyframes draw{to{stroke-dashoffset:0}}

/* ---------- Cartes service ---------- */
.svc-grid{grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr))}
.svc-card{position:relative;background:#fff;border:1px solid var(--zinc-100);border-radius:var(--r-md);padding:2rem 1.75rem;overflow:hidden;transition:transform var(--t-mid) var(--ease),box-shadow var(--t-mid),border-color var(--t-mid);display:flex;flex-direction:column}
.svc-card::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:var(--tuile);transform:scaleX(0);transform-origin:left;transition:transform var(--t-mid) var(--ease)}
.svc-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-2);border-color:transparent}
.svc-card:hover::before{transform:scaleX(1)}
.svc-card .ico{width:46px;height:46px;color:var(--tuile);margin-bottom:1.1rem}
.svc-card h3{margin-bottom:.6rem}
.svc-card p{color:var(--zinc-600);font-size:.98rem;flex:1}
.svc-card .linkarrow{margin-top:1.25rem}
.svc-card .num{position:absolute;top:1.5rem;right:1.5rem;font-family:var(--font-mono);font-size:.8rem;color:var(--zinc-300)}

/* ---------- "Pourquoi" ---------- */
.why-grid{grid-template-columns:repeat(auto-fit,minmax(min(100%,220px),1fr))}
.why{padding:1.75rem 0;border-top:2px solid var(--slate-700)}
.section--slate .why h3{color:#fff;font-size:1.3rem;margin-bottom:.4rem}
.why .ico{width:38px;height:38px;color:var(--tuile-300);margin-bottom:1rem}
.why p{color:var(--zinc-300);font-size:.96rem}

/* ---------- Bande service alternée ---------- */
.feature{display:grid;grid-template-columns:1.05fr 1fr;gap:clamp(2rem,5vw,4.5rem);align-items:center}
.feature--rev .feature__media{order:-1}
.feature__media{position:relative}
.feature__media img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--r-md);box-shadow:var(--shadow-2);clip-path:polygon(0 0,100% 0,100% 100%,0 calc(100% - 5vw))}
.feature ul[role="list"]{display:grid;gap:.7rem;margin-top:1.5rem}
.feature ul[role="list"] li{position:relative;padding-left:1.9rem;color:var(--zinc-600)}
.feature ul[role="list"] li::before{content:"";position:absolute;left:0;top:.55em;width:.85rem;height:.85rem;background:var(--tuile);transform:skewY(calc(-1*var(--pitch)));border-radius:1px}
@media (max-width:760px){.feature{grid-template-columns:1fr}.feature--rev .feature__media{order:0}.feature__media img{clip-path:none}}

/* ---------- Bloc stats / preuve ---------- */
.proof{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:1.5rem;text-align:center}
.proof .n{font-family:var(--font-display);font-weight:700;font-size:clamp(2.4rem,5vw,3.6rem);color:var(--tuile);line-height:1;letter-spacing:-.03em}
.proof .l{font-family:var(--font-mono);font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;color:var(--zinc-500);margin-top:.5rem}

/* ---------- Zone d'intervention ---------- */
.cities{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:1.5rem}
.city{font-family:var(--font-mono);font-size:.85rem;padding:.45rem .85rem;background:#fff;border:1px solid var(--zinc-200);border-radius:var(--r-pill);color:var(--slate-800)}
.city b{color:var(--tuile);font-weight:500}
.section--slate .city{background:var(--slate-800);border-color:var(--slate-700);color:var(--zinc-200)}

/* ---------- Réalisations ---------- */
.gallery{grid-template-columns:repeat(auto-fill,minmax(min(100%,280px),1fr));gap:1rem}
.shot{position:relative;border-radius:var(--r-md);overflow:hidden;background:var(--slate-800);aspect-ratio:4/3}
.shot img{width:100%;height:100%;object-fit:cover;transition:transform var(--t-slow) var(--ease)}
.shot:hover img{transform:scale(1.06)}
.shot figcaption{position:absolute;left:0;right:0;bottom:0;padding:1.5rem 1rem .9rem;background:linear-gradient(transparent,rgba(22,33,43,.85));color:#fff;font-family:var(--font-mono);font-size:.8rem;letter-spacing:.04em}

/* ---------- Formulaire ---------- */
.form-card{background:#fff;border-radius:var(--r-lg);padding:clamp(1.5rem,4vw,2.5rem);box-shadow:var(--shadow-2);border:1px solid var(--zinc-100)}
.field{display:flex;flex-direction:column;gap:.4rem;margin-bottom:1.1rem}
.field label{font-weight:600;font-size:.92rem;color:var(--slate-800)}
.field label .req{color:var(--tuile)}
.field input,.field select,.field textarea{
  background:var(--paper);border:1.5px solid var(--zinc-200);border-radius:var(--r-sm);
  padding:.8rem .9rem;transition:border-color var(--t-fast),box-shadow var(--t-fast);width:100%;
}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--tuile);box-shadow:0 0 0 3px rgba(176,72,31,.15)}
.field textarea{min-height:120px;resize:vertical}
.field--row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
@media (max-width:560px){.field--row{grid-template-columns:1fr}}
.field .err{color:var(--tuile-700);font-size:.82rem;display:none}
.field.invalid input,.field.invalid select,.field.invalid textarea{border-color:var(--tuile-700)}
.field.invalid .err{display:block}
.form-note{font-size:.82rem;color:var(--zinc-500);margin-top:.5rem}
.form-success{display:none;padding:1rem 1.1rem;background:#e8f3ec;border:1px solid #b6d8c2;border-radius:var(--r-sm);color:#1f5135;margin-bottom:1rem}
.form-success.show{display:block}

/* ---------- FAQ ---------- */
.faq{border-top:1px solid var(--zinc-200)}
.faq details{border-bottom:1px solid var(--zinc-200)}
.faq summary{cursor:pointer;list-style:none;padding:1.25rem 0;font-family:var(--font-display);font-weight:600;font-size:1.12rem;color:var(--slate-900);display:flex;justify-content:space-between;gap:1rem;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--font-mono);font-size:1.5rem;color:var(--tuile);transition:transform var(--t-fast)}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{padding-bottom:1.25rem;color:var(--zinc-600)}

/* ---------- Breadcrumb ---------- */
.crumb{font-family:var(--font-mono);font-size:.8rem;color:var(--zinc-600);padding-top:1.5rem;display:flex;gap:.5rem;flex-wrap:wrap}
.crumb a:hover{color:var(--tuile)}
.crumb [aria-current]{color:var(--slate-800)}

/* ---------- Page header (intérieures) ---------- */
.page-hero{background:var(--slate-900);color:#fff;position:relative;overflow:hidden}
.page-hero .wrap{padding-block:clamp(3rem,7vw,5rem) clamp(3.5rem,8vw,5.5rem)}
.page-hero h1{color:#fff;max-width:18ch;margin-top:1rem}
.page-hero .lead{color:var(--zinc-200);margin-top:1.25rem;max-width:58ch}
.page-hero::before{content:"";position:absolute;left:0;right:0;bottom:-1px;height:5vw;max-height:64px;background:var(--paper);clip-path:polygon(0 100%,100% 0,100% 100%)}
.page-hero--paper{background:var(--paper)}
.page-hero--paper h1,.page-hero--paper .lead{color:var(--ink)}
.page-hero--paper .lead{color:var(--zinc-600)}
.page-hero--paper::before{display:none}

/* ---------- CTA bande finale ---------- */
.cta-band{background:var(--tuile);color:#fff;border-radius:var(--r-lg);padding:clamp(2rem,5vw,3.5rem);display:flex;align-items:center;justify-content:space-between;gap:2rem;flex-wrap:wrap;position:relative;overflow:hidden}
.cta-band h2{color:#fff;max-width:18ch}
.cta-band p{color:rgba(255,255,255,.9);margin-top:.5rem}
.cta-band .btn--light{flex:none}

/* ---------- Footer ---------- */
.site-footer{background:var(--slate-900);color:var(--zinc-300);padding-block:var(--s9) var(--s6)}
.site-footer .cols{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.3fr;gap:2.5rem}
.site-footer .fh{color:#fff;font-family:var(--font-mono);font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;font-weight:500;margin-bottom:1.1rem}
.site-footer a:hover{color:var(--tuile-300)}
.site-footer ul[role="list"]{display:grid;gap:.6rem;font-size:.95rem}
.site-footer .brand{color:#fff;margin-bottom:1rem}
.site-footer .desc{font-size:.92rem;color:var(--zinc-300);max-width:34ch}
.site-footer .contact-line{display:flex;align-items:center;gap:.6rem;font-family:var(--font-mono);font-size:.9rem;color:#fff}
.footer-bottom{margin-top:var(--s7);padding-top:var(--s5);border-top:1px solid var(--slate-700);display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;font-size:.82rem;color:var(--zinc-300)}
@media (max-width:860px){.site-footer .cols{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.site-footer .cols{grid-template-columns:1fr}}

/* ---------- Reveal au scroll ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity var(--t-slow) var(--ease),transform var(--t-slow) var(--ease)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  .hero__ridge path{animation:none;stroke-dashoffset:0}
  *{scroll-behavior:auto!important}
}

/* ---------- Utilitaires ---------- */
.text-center{text-align:center}
.mt-0{margin-top:0}
.section-head{max-width:60ch;margin-bottom:clamp(2rem,4vw,3rem)}
.section-head.center{margin-inline:auto;text-align:center}
.section-head h2{margin-top:.75rem}
.section-head p{margin-top:1rem;color:var(--zinc-600)}
.section--slate .section-head p{color:var(--zinc-300)}