:root{
  --ink:#0E2F4A;      /* bleu nuit, réseau */
  --ink-2:#1B4466;
  --vis:#F2C200;      /* jaune haute visibilité */
  --red:#D7261E;      /* rouge AMB */
  --red-2:#B81C15;
  --paper:#FFFFFF;
  --mist:#EEF2F5;
  --steel:#55636E;
  --line:#D3DBE1;
  /* couleurs de fibres, utilisées comme repères de service */
  --f1:#E2231A; --f2:#1F6FC5; --f3:#2E9D47; --f4:#F2C200; --f5:#7A3E9D; --f6:#B9C3CA;
  --f7:#F07D1A; --f8:#8C969D; --f9:#7A4A2A; --f10:#1D1D1B; --f11:#1BB3B0; --f12:#E77FB0;
  --display:"Barlow Condensed", "Arial Narrow", sans-serif;
  --body:"Barlow", system-ui, sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;font-family:var(--body);font-size:1.0625rem;line-height:1.6;color:var(--ink);background:var(--paper)}
img,svg{display:block;max-width:100%}
a{color:var(--ink-2)}
:focus-visible{outline:3px solid var(--vis);outline-offset:3px}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}
h1,h2,h3{font-family:var(--display);line-height:1.05;margin:0;letter-spacing:.005em}
h2{font-size:clamp(2.1rem,4.2vw,3.1rem);font-weight:800}
h3{font-size:1.55rem;font-weight:700}
p{margin:0 0 1em;max-width:68ch}

/* boutons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5em;font-family:var(--display);font-weight:700;font-size:1.2rem;letter-spacing:.02em;padding:.7em 1.3em;border-radius:6px;border:2px solid transparent;text-decoration:none;cursor:pointer;transition:background .15s,color .15s}
.btn-devis{background:var(--red);color:#fff}
.btn-devis:hover{background:var(--red-2)}
.btn-ghost{border-color:currentColor;color:inherit;background:transparent}
.btn-ghost:hover{background:rgba(255,255,255,.08)}
.btn-sm{font-size:1.05rem;padding:.5em 1em}

/* en-tête */
header.top{position:sticky;top:0;z-index:20;background:var(--ink);color:#fff;border-bottom:4px solid var(--red)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:20px;height:72px}
.logo{display:flex;align-items:center;gap:12px;color:#fff;text-decoration:none}
.logo b{font-family:var(--display);font-weight:800;font-size:2rem;letter-spacing:.06em;line-height:1}
.logo small{display:block;font-size:.78rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:#F2C200;line-height:1.3;border-top:2px solid #F2C200;padding-top:2px;margin-top:3px}
nav.main{display:flex;gap:26px;align-items:center}
nav.main a{color:#fff;text-decoration:none;font-weight:500}
nav.main a:hover{color:var(--vis)}
@media (max-width:900px){nav.main a:not(.btn){display:none}}
@media (max-width:760px){nav.main{display:none}.logo b{font-size:1.45rem;white-space:nowrap}.top .wrap{height:64px}}

/* hero */
.hero{background:var(--ink);color:#fff;position:relative;overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;padding-top:72px;padding-bottom:0;align-items:end}
.hero h1{font-size:clamp(2.7rem,6.4vw,5.2rem);font-weight:800}
.hero p.lead{font-size:1.25rem;color:#D5E0E8;margin:24px 0 32px;max-width:52ch}
.hero .ctas{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:64px}
.hero .facts{display:flex;flex-wrap:wrap;gap:10px 28px;margin:0 0 56px;padding:0;list-style:none;color:#B9C8D4;font-size:.98rem}
.hero .facts li::before{content:"";display:inline-block;width:10px;height:10px;border-radius:50%;background:var(--vis);margin-right:8px;vertical-align:1px}
.mast{align-self:stretch;display:flex;align-items:flex-end}
.strands{width:100%;height:120px;margin-top:-10px}
.strands path{fill:none;stroke-width:5;stroke-linecap:round}
@media (prefers-reduced-motion:no-preference){
  .strands path{stroke-dasharray:1400;stroke-dashoffset:1400;animation:draw 1.6s cubic-bezier(.3,.6,.2,1) forwards}
  .strands path:nth-child(n){animation-delay:calc(var(--i) * 70ms)}
}
@keyframes draw{to{stroke-dashoffset:0}}
@media (max-width:860px){.hero .wrap{grid-template-columns:1fr}.mast{display:none}}

/* sections */
section{padding:88px 0}
.intro{display:grid;grid-template-columns:1fr 1.4fr;gap:48px;align-items:start;margin-bottom:48px}
.intro p{color:var(--steel);font-size:1.15rem}
@media (max-width:860px){.intro{grid-template-columns:1fr;gap:16px}}

/* liste de services : un brin de fibre coloré par service */
.svc{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.svc li{display:grid;grid-template-columns:8px 1.1fr 1.6fr auto;gap:24px;align-items:center;padding:26px 0;border-bottom:1px solid var(--line)}
.svc .strand{align-self:stretch;border-radius:4px;background:var(--c)}
.svc h3{margin-bottom:6px}
.svc .who{font-size:.95rem;color:var(--steel);margin:0}
.svc .what{margin:0;color:#2A3F51}
@media (max-width:860px){
  .svc li{grid-template-columns:8px 1fr;gap:10px 18px}
  .svc .what,.svc .act{grid-column:2}
}
.band{background:var(--mist)}

/* encadré particuliers */
.callout{display:grid;grid-template-columns:auto 1fr auto;gap:28px;align-items:center;background:var(--ink);color:#fff;border-radius:10px;padding:32px 36px;margin-top:48px}
.callout h3{font-size:1.9rem}
.callout p{margin:6px 0 0;color:#D5E0E8}
.callout .tag{width:64px;height:64px;border-radius:14px;background:var(--red);display:grid;place-items:center}
@media (max-width:760px){.callout{grid-template-columns:1fr}.callout .tag{display:none}}

/* étapes */
.steps{counter-reset:s;display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin:0;padding:0;list-style:none;border-top:4px solid var(--ink)}
.steps li{counter-increment:s;padding:24px 22px 8px 0}
.steps li::before{content:counter(s);display:block;font-family:var(--display);font-weight:800;font-size:3rem;line-height:1;color:var(--red);-webkit-text-stroke:0;margin-bottom:10px}
.steps p{color:var(--steel);font-size:1rem}
@media (max-width:860px){.steps{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.steps{grid-template-columns:1fr}}

/* zone */
.zone{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.towns{columns:2;gap:24px;padding:0;margin:20px 0 0;list-style:none}
.towns li{padding:6px 0;border-bottom:1px dashed var(--line)}
@media (max-width:860px){.zone{grid-template-columns:1fr}}

/* FAQ */
.faq details{border-bottom:1px solid var(--line);padding:18px 0}
.faq summary{cursor:pointer;font-family:var(--display);font-weight:700;font-size:1.4rem;list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.8rem;line-height:1;color:var(--ink-2)}
.faq details[open] summary::after{content:"–"}
.faq details p{margin:12px 0 0;color:#2A3F51}

/* devis */
#devis{background:var(--ink);color:#fff}
#devis .grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:56px}
#devis p{color:#D5E0E8}
form{background:#fff;color:var(--ink);border-radius:10px;padding:32px;display:grid;grid-template-columns:1fr 1fr;gap:18px}
form .full{grid-column:1/-1}
label{display:block;font-weight:600;font-size:.95rem;margin-bottom:6px}
input,select,textarea{width:100%;font:inherit;font-size:1rem;padding:.7em .8em;border:1.5px solid #AEBBC5;border-radius:6px;background:#fff;color:var(--ink)}
input:focus,select:focus,textarea:focus{border-color:var(--ink-2);outline:2px solid var(--vis);outline-offset:0}
textarea{min-height:130px;resize:vertical}
.check{display:flex;gap:10px;align-items:flex-start;font-weight:400;font-size:.92rem;color:var(--steel)}
.check input{width:auto;margin-top:4px}
.hp{position:absolute;left:-9999px}
.msg{grid-column:1/-1;padding:14px 16px;border-radius:6px;display:none}
.msg.ok{display:block;background:#E3F4E8;color:#1D5B2E}
.msg.err{display:block;background:#FCE8E6;color:#8A1F17}
@media (max-width:860px){#devis .grid{grid-template-columns:1fr}form{grid-template-columns:1fr;padding:22px}}

footer{background:#0A2236;color:#B9C8D4;padding:48px 0 96px;font-size:.95rem}
footer .wrap{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:32px}
footer a{color:#fff}
footer h4{font-family:var(--display);font-size:1.3rem;color:#fff;margin:0 0 10px}
@media (max-width:760px){footer .wrap{grid-template-columns:1fr}}

/* barre devis mobile */
.mobile-cta{display:none}
@media (max-width:760px){
  .mobile-cta{display:block;position:fixed;left:0;right:0;bottom:0;z-index:30;padding:10px 14px calc(10px + env(safe-area-inset-bottom));background:var(--ink);border-top:3px solid var(--red)}
  .mobile-cta{display:flex;gap:10px}
  .mobile-cta .btn{flex:2;white-space:nowrap;font-size:1.1rem;padding:.65em .8em}
  .mobile-cta .call{flex:1;color:#fff}
}

/* ---- ajouts : pages services, villes, formulaire ---- */
.skip{position:absolute;left:-9999px;top:0;background:#fff;color:var(--ink);padding:10px 14px;z-index:50}
.skip:focus{left:10px;top:10px}
.logo svg{flex:none;border-radius:9px}
.logo b{font-family:var(--display);font-weight:800;font-size:2rem;letter-spacing:.06em;line-height:1}
.logo small{display:block;font-size:.74rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:#fff;opacity:.92;line-height:1.3;border-top:2px solid var(--red);padding-top:3px;margin-top:4px}
nav.main a.tel{font-weight:600;color:var(--vis)}
.mt{margin-top:16px}
a.hl{color:var(--vis)}
a.more{font-weight:600;color:var(--ink-2)}
a.more::after{content:" →"}
.hero{border-bottom:0}
.hero .facts li::before{background:var(--red)}
.svc h3 a{color:inherit;text-decoration:none}
.svc h3 a:hover{text-decoration:underline;text-decoration-color:var(--red);text-underline-offset:4px}

/* en-tête des pages internes */
.phero{background:var(--ink);color:#fff;padding:40px 0 64px;position:relative;overflow:hidden}
.phero::after{content:"";position:absolute;left:0;right:0;bottom:0;height:8px;background:linear-gradient(90deg,var(--red) 0 34%,var(--vis) 34% 52%,#1F6FC5 52% 70%,#2E9D47 70% 86%,#F07D1A 86%)}
.phero h1{font-size:clamp(2.3rem,5.4vw,4rem);font-weight:800;max-width:22ch;margin-top:18px}
.phero .lead{font-size:1.15rem;color:#D5E0E8;margin:20px 0 14px;max-width:62ch}
.phero .who{color:#B9C8D4;font-size:.98rem}
.phero .who b{color:#fff}
.phero .ctas{display:flex;flex-wrap:wrap;gap:14px;margin-top:26px}
.crumbs ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px;font-size:.9rem;color:#B9C8D4}
.crumbs li+li::before{content:"›";margin-right:6px;color:var(--red)}
.crumbs a{color:#fff;text-decoration:none}
.crumbs a:hover{text-decoration:underline}

/* contenu rédactionnel */
.prose-sec{padding:64px 0}
.two{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:56px;align-items:start}
@media (max-width:900px){.two{grid-template-columns:1fr;gap:32px}}
.prose h1{font-size:clamp(2.2rem,4.5vw,3rem);margin-bottom:20px}
.prose h2{font-size:1.9rem;margin:34px 0 12px}
.prose h2:first-child{margin-top:0}
.prose p{color:#2A3F51}
.cta-line{margin:28px 0 8px}
.side{position:sticky;top:96px;display:grid;gap:18px}
.card{border:1px solid var(--line);border-top:4px solid var(--red);border-radius:8px;padding:20px;background:#fff}
.card h3{font-size:1.35rem;margin-bottom:8px}
.card p{font-size:.98rem;color:var(--steel)}
.card .small{margin:12px 0 0;font-weight:600}
.links{list-style:none;margin:0;padding:0}
.links li{padding:7px 0;border-bottom:1px dashed var(--line)}
.links li span{color:var(--steel);font-size:.88rem}
.links a{text-decoration:none;font-weight:500}
.links a:hover{text-decoration:underline}
.faq details:first-child{border-top:1px solid var(--line)}

/* listes de villes */
.cities{list-style:none;padding:0;margin:22px 0;display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:8px 20px}
.cities li{padding:8px 0;border-bottom:1px solid var(--line)}
.cities a{text-decoration:none;font-weight:500}
.cities a:hover{text-decoration:underline}
.cities span{display:block;font-size:.85rem;color:var(--steel)}
.zones h2{font-size:2rem;margin-top:40px}
.zones h2:first-child{margin-top:0}

/* cartes de services (pages villes) */
.cards{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:18px}
.cards li{background:#fff;border:1px solid var(--line);border-left:6px solid var(--c);border-radius:8px;padding:20px 20px 22px;display:flex;flex-direction:column}
.cards h3{font-size:1.4rem;margin-bottom:8px}
.cards h3 a{color:inherit;text-decoration:none}
.cards h3 a:hover{text-decoration:underline}
.cards p{font-size:.98rem;color:#2A3F51;flex:1}
.cards .btn{align-self:flex-start}

/* formulaire */
input[type=file]{padding:.55em;background:var(--mist)}
.captcha{min-height:0}
.captcha:not(:empty){min-height:66px}
.check a{color:var(--ink-2)}
form button[disabled]{opacity:.7;cursor:wait}

/* pied de page */
footer ul{list-style:none;margin:0;padding:0}
footer li{padding:3px 0}
footer a{text-decoration:none}
footer a:hover{text-decoration:underline}
footer .legal{font-size:.85rem;color:#8EA3B4}
.flogo{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.flogo b{font-family:var(--display);font-weight:800;font-size:1.9rem;color:#fff;letter-spacing:.06em}