/* ============================================================
   RFO TELECOM — Design System
   Dark / technical. Black + signal-yellow + steel grey.
   Angular "cut-corner" motif drawn from the logo geometry.
   ============================================================ */

:root{
  /* Core palette (sampled from logo) */
  --bg:        #191817;   /* charbon « gris-noir » (carte RFO) */
  --bg-2:      #201f1d;   /* raised surface */
  --bg-3:      #262523;   /* card */
  --bg-line:   #333230;
  --ink:       #f4f6f7;   /* primary text */
  --ink-dim:   #aab1b6;   /* secondary text */
  --ink-mute:  #6c757c;   /* tertiary */
  --yellow:    #de9a0d;   /* couleur principale dorée */
  --yellow-2:  #e5b042;   /* teinte plus claire */
  --yellow-ink:#111307;   /* texte lisible sur la couleur principale */
  --yellow-rgb:222,154,13;/* couleur principale en r,g,b pour les rgba() */
  --steel:     #9aa3a9;   /* logo grey */
  --steel-2:   #5d666c;
  --line:      rgba(255,255,255,.08);
  --line-2:    rgba(255,255,255,.14);
  --net-rgb:   154,163,169;/* couleur du canvas « réseau fibre » (r,g,b) — surchargée en thème clair */

  /* Type */
  --f-display: "Saira", system-ui, sans-serif;
  --f-body:    "IBM Plex Sans", system-ui, sans-serif;
  --f-mono:    "IBM Plex Mono", ui-monospace, monospace;

  /* Geometry */
  --notch: 14px;             /* corner cut size */
  --maxw: 1240px;
  --gut: clamp(20px, 5vw, 56px);
  --radius: 4px;

  --ease: cubic-bezier(.22,.61,.36,1);
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--f-body);
  font-size:17px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
::selection{ background:var(--yellow); color:var(--yellow-ink); }

img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
button{ font-family:inherit; }

/* ---------- Layout ---------- */
.wrap{ width:min(100% - 2*var(--gut), var(--maxw)); margin-inline:auto; }
section{ padding:clamp(64px, 9vw, 128px) 0; position:relative; }
.section-sm{ padding:clamp(44px,6vw,80px) 0; }

/* ---------- Type scale ---------- */
.eyebrow{
  font-family:var(--f-mono);
  font-size:12px; letter-spacing:.28em; text-transform:uppercase;
  color:var(--yellow);
  display:inline-flex; align-items:center; gap:10px;
  font-weight:500;
}
.eyebrow::before{
  content:""; width:26px; height:1px; background:var(--yellow);
  display:inline-block;
}
.eyebrow.center::after{
  content:""; width:26px; height:1px; background:var(--yellow); display:inline-block;
}
h1,h2,h3,h4{ font-family:var(--f-display); font-weight:700; line-height:1.02; margin:0; letter-spacing:-.01em; }
h1{ font-size:clamp(40px, 6.4vw, 86px); font-weight:800; letter-spacing:-.025em; }
h2{ font-size:clamp(30px, 4.2vw, 56px); letter-spacing:-.02em; }
h3{ font-size:clamp(20px, 2vw, 27px); font-weight:650; letter-spacing:-.01em; }
h4{ font-size:18px; font-weight:600; }
p{ margin:0; }
.lead{ font-size:clamp(18px,1.7vw,21px); color:var(--ink-dim); line-height:1.7; }
.muted{ color:var(--ink-dim); }
strong{ font-weight:650; color:var(--ink); }

.display-xl{ font-family:var(--f-display); font-weight:800; line-height:.92; letter-spacing:-.03em; }

/* monospace technical label */
.mono{ font-family:var(--f-mono); font-size:13px; letter-spacing:.04em; color:var(--ink-dim); }

/* ---------- Buttons ---------- */
.btn{
  --c:var(--yellow);
  display:inline-flex; align-items:center; gap:10px;
  font-family:var(--f-mono); font-size:13.5px; font-weight:600;
  letter-spacing:.06em; text-transform:uppercase;
  padding:15px 24px; cursor:pointer; border:1px solid transparent;
  background:var(--yellow); color:var(--yellow-ink);
  clip-path:polygon(0 0, 100% 0, 100% calc(100% - var(--notch)), calc(100% - var(--notch)) 100%, 0 100%);
  transition:transform .25s var(--ease), background .25s var(--ease), color .2s;
  position:relative; white-space:nowrap;
}
.btn:hover{ transform:translateY(-2px); background:var(--yellow-2); }
.btn .arr{ transition:transform .25s var(--ease); }
.btn:hover .arr{ transform:translateX(4px); }
.btn.ghost{
  background:transparent; color:var(--ink); border:1px solid var(--line-2);
}
.btn.ghost:hover{ background:rgba(255,255,255,.04); border-color:var(--yellow); color:var(--yellow); }
.btn.sm{ padding:11px 18px; font-size:12px; }
.btn.block{ width:100%; justify-content:center; }

/* ---------- Cut-corner surfaces ---------- */
.panel{
  background:var(--bg-3);
  border:1px solid var(--line);
  position:relative;
  clip-path:polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}
.cut-tr{ clip-path:polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%); }
.cut-bl{ clip-path:polygon(0 0, 100% 0, 100% 100%, 20px 100%, 0 calc(100% - 20px)); }

/* corner tick decoration */
.tick{ position:absolute; width:9px; height:9px; border:1.5px solid var(--yellow); }
.tick.tl{ top:10px; left:10px; border-right:0; border-bottom:0; }
.tick.br{ bottom:10px; right:10px; border-left:0; border-top:0; }

/* ---------- Pills / tags ---------- */
.pill{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--f-mono); font-size:11.5px; letter-spacing:.14em; text-transform:uppercase;
  color:var(--ink-dim); padding:7px 13px;
  border:1px solid var(--line-2); border-radius:100px;
}
.pill .dot{ width:6px; height:6px; border-radius:50%; background:var(--yellow); box-shadow:0 0 0 3px rgba(var(--yellow-rgb),.18); }
.tag{
  display:inline-block; font-family:var(--f-mono); font-size:11px; letter-spacing:.14em;
  text-transform:uppercase; color:var(--yellow); padding:5px 10px;
  border:1px solid rgba(var(--yellow-rgb),.34); background:rgba(var(--yellow-rgb),.06);
}

/* ---------- Header ---------- */
.topbar{
  border-bottom:1px solid var(--line);
  background:#131211;
  font-family:var(--f-mono); font-size:11.5px; letter-spacing:.1em; text-transform:uppercase;
  color:var(--ink-mute);
}
.topbar .wrap{ display:flex; justify-content:space-between; gap:18px; padding:9px 0; align-items:center; }
.topbar .ti{ display:flex; gap:22px; flex-wrap:wrap; align-items:center; }
.topbar .ti span, .topbar .ti a{ display:inline-flex; align-items:center; gap:7px; color:inherit; transition:color .2s; }
.topbar .ti a:hover{ color:var(--yellow); }
.topbar .ti svg{ flex:none; }
.topbar .ti .hl{ color:var(--yellow); }

header.site{
  position:sticky; top:0; z-index:80;
  background:rgba(19,18,17,.82); backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
/* let the injected header participate in body flow so sticky works through full scroll */
#site-header{ display:contents; }
header.site .wrap{ display:flex; align-items:center; justify-content:space-between; gap:24px; height:74px; }
.brand{ display:flex; align-items:center; gap:13px; }
.brand > span{ display:flex; flex-direction:column; justify-content:center; }
.brand .logo{ width:42px; height:42px; flex:none; }
.brand .bt{ font-family:var(--f-display); font-weight:800; font-size:20px; letter-spacing:.02em; line-height:1; }
.brand .bt span{ color:var(--yellow); }
.brand .bs{ font-family:var(--f-mono); font-size:10px; letter-spacing:.24em; text-transform:uppercase; color:var(--ink-mute); margin-top:3px; }

nav.menu{ display:flex; gap:4px; align-items:center; }
nav.menu a{
  font-family:var(--f-mono); font-size:13px; letter-spacing:.04em; text-transform:uppercase;
  color:var(--ink-dim); padding:10px 14px; position:relative; transition:color .2s;
}
nav.menu a:hover{ color:var(--ink); }
nav.menu a.active{ color:var(--yellow); }
nav.menu a.active::after{
  content:""; position:absolute; left:14px; right:14px; bottom:4px; height:2px; background:var(--yellow);
}
.nav-right{ display:flex; align-items:center; gap:14px; }

.lang{ display:flex; border:1px solid var(--line-2); font-family:var(--f-mono); font-size:11.5px; }
.lang button{
  background:transparent; border:0; color:var(--ink-mute); padding:7px 10px; cursor:pointer;
  letter-spacing:.08em; transition:.2s;
}
.lang button.on{ background:var(--yellow); color:var(--yellow-ink); font-weight:600; }

.burger{ display:none; background:transparent; border:1px solid var(--line-2); color:var(--ink); width:42px; height:42px; cursor:pointer; }
.burger svg{ margin:auto; }

/* mobile drawer */
.drawer{
  position:fixed; inset:0; z-index:90; background:rgba(19,18,17,.97); backdrop-filter:blur(8px);
  display:none; flex-direction:column; padding:24px var(--gut);
}
.drawer.open{ display:flex; overflow-y:auto; }
.drawer .dhead{ display:flex; justify-content:space-between; align-items:center; height:50px; }
.drawer nav{ display:flex; flex-direction:column; gap:4px; margin-top:30px; }
.drawer nav a{ font-family:var(--f-display); font-weight:600; font-size:30px; padding:12px 0; border-bottom:1px solid var(--line); color:var(--ink); }
.drawer nav a.active{ color:var(--yellow); }
.drawer-cta{ margin-top:auto; margin-bottom:14px; font-size:14px; padding:17px 24px; }
.x-close{ background:transparent;border:1px solid var(--line-2); color:var(--ink); width:42px;height:42px; cursor:pointer; }

/* ---------- Grid background / decorative ---------- */
.gridlines{
  position:absolute; inset:0; z-index:0; pointer-events:none;
  background-image:linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:64px 64px;
  -webkit-mask-image:radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 75%);
          mask-image:radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 75%);
  opacity:.5;
}
.glow{
  position:absolute; width:620px; height:620px; border-radius:50%; z-index:0; pointer-events:none;
  background:radial-gradient(circle, rgba(var(--yellow-rgb),.16), transparent 65%);
  filter:blur(8px);
}

/* fiber network canvas */
.fibercanvas{ position:absolute; inset:0; z-index:0; width:100%; height:100%; pointer-events:none; }

/* ---------- Cards ---------- */
.card{
  background:var(--bg-3); border:1px solid var(--line); padding:30px;
  position:relative; transition:border-color .3s var(--ease), transform .3s var(--ease), background .3s;
  clip-path:polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}
.card:hover{ border-color:var(--line-2); transform:translateY(-4px); background:#2b2a27; }
.card .ic{
  width:48px; height:48px; display:grid; place-items:center; margin-bottom:20px;
  border:1px solid rgba(var(--yellow-rgb),.3); color:var(--yellow);
}
.card h3{ margin-bottom:10px; }
.card p{ color:var(--ink-dim); font-size:15.5px; }

/* number stat */
.stat .n{ font-family:var(--f-display); font-weight:800; font-size:clamp(44px,6vw,72px); line-height:1; color:var(--yellow); letter-spacing:-.03em; }
.stat .l{ font-family:var(--f-mono); font-size:12.5px; letter-spacing:.08em; text-transform:uppercase; color:var(--ink-dim); margin-top:10px; }

/* list */
ul.checks{ list-style:none; padding:0; margin:0; display:grid; gap:14px; }
ul.checks li{ display:flex; gap:13px; align-items:flex-start; color:var(--ink-dim); }
ul.checks li::before{
  content:""; width:18px; height:18px; flex:none; margin-top:3px;
  background:var(--yellow);
  clip-path:polygon(0 0, 100% 0, 100% 100%);
}

/* diagonal accent strip */
.stripe{
  height:6px; background:repeating-linear-gradient(135deg, var(--yellow) 0 16px, transparent 16px 32px);
  opacity:.9;
}

/* ---------- Footer ---------- */
footer.site{ border-top:1px solid var(--line); background:#131211; position:relative; overflow:hidden; }
.foot-main{ display:grid; grid-template-columns:1.5fr 1fr 1fr 1.2fr; gap:40px; padding:72px 0 48px; }
.foot-col h5{ font-family:var(--f-mono); font-size:12px; letter-spacing:.16em; text-transform:uppercase; color:var(--ink-mute); margin:0 0 18px; }
.foot-col a{ display:block; color:var(--ink-dim); font-size:15px; padding:5px 0; transition:color .2s, padding-left .2s; }
.foot-col a:hover{ color:var(--yellow); padding-left:6px; }
.foot-contact div{ color:var(--ink-dim); font-size:14.5px; display:flex; gap:10px; align-items:flex-start; margin-bottom:12px; }
.foot-contact .k{ color:var(--yellow); font-family:var(--f-mono); font-size:11px; letter-spacing:.1em; text-transform:uppercase; min-width:64px; }
.foot-bottom{ border-top:1px solid var(--line); padding:22px 0 36px; display:flex; justify-content:space-between; gap:18px; flex-wrap:wrap; color:var(--ink-mute); font-family:var(--f-mono); font-size:12px; letter-spacing:.05em; }

/* ---------- Reveal animation ---------- */
[data-rise]{ opacity:0; transform:translateY(36px); filter:blur(7px); transition:opacity .85s var(--ease), transform .85s var(--ease), filter .85s var(--ease); will-change:opacity,transform,filter; }
[data-rise].in{ opacity:1; transform:none; filter:none; }
[data-rise="left"]{ transform:translateX(-46px); }
[data-rise="right"]{ transform:translateX(46px); }
[data-rise="zoom"]{ transform:scale(.9); }
[data-rise="clip"]{ opacity:1; filter:none; transform:none; clip-path:inset(0 100% 0 0); transition:clip-path .9s var(--ease); }
[data-rise="clip"].in{ clip-path:inset(0 0 0 0); }
@media(prefers-reduced-motion: reduce){
  [data-rise]{ opacity:1 !important; transform:none !important; filter:none !important; clip-path:none !important; }
}

/* ---------- Title hover: fibre light pulse ---------- */
.section-head h2, .phero h1{ display:block; width:fit-content; max-width:100%; }
.section-head.center h2{ margin-inline:auto; }
.section-head h2, .phero h1, .heroC h1{
  position:relative; isolation:isolate;
  transition:text-shadow .4s var(--ease), filter .4s var(--ease);
}
/* travelling light pulse */
.section-head h2::after, .phero h1::after, .heroC h1::after{
  content:""; position:absolute; inset:-4px -10px; z-index:3; pointer-events:none;
  background:linear-gradient(100deg,
     transparent 40%,
     rgba(255,255,255,.5) 46%,
     rgba(255,255,160,.9) 49%,
     #fff 50%,
     rgba(var(--yellow-rgb),.95) 51%,
     rgba(255,255,160,.6) 54%,
     transparent 60%);
  background-size:280% 100%; background-position:135% 0;
  mix-blend-mode:screen; filter:blur(2.5px);
  opacity:0;
}
.section-head h2:hover::after, .phero h1:hover::after, .heroC h1:hover::after{
  opacity:1; animation:fibrePulse .9s cubic-bezier(.4,.05,.25,1);
}
.section-head h2:hover, .phero h1:hover, .heroC h1:hover{
  text-shadow:0 0 38px rgba(var(--yellow-rgb),.45), 0 0 14px rgba(255,255,255,.25);
}
@keyframes fibrePulse{
  0%{ background-position:135% 0; opacity:0; }
  12%{ opacity:1; }
  88%{ opacity:1; }
  100%{ background-position:-55% 0; opacity:0; }
}
@media(prefers-reduced-motion: reduce){
  .section-head h2::after, .phero h1::after, .heroC h1::after{ display:none; }
}

/* card / item titles shift to signal-yellow on hover */
.card h3, .res h3, .val h3, .need h3, .srow h3, .cert h3, .vcard h3{ transition:color .3s var(--ease), transform .3s var(--ease); }
.card:hover h3, .res:hover h3, .val:hover h3, .need:hover h3, .srow:hover h3, .cert:hover h3, .vcard:hover h3{ color:var(--yellow); }

/* ---------- Generic grids ---------- */
.g2{ display:grid; grid-template-columns:repeat(2,1fr); gap:24px; }
.g3{ display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
.g4{ display:grid; grid-template-columns:repeat(4,1fr); gap:24px; }
.split{ display:grid; grid-template-columns:1.05fr .95fr; gap:clamp(36px,5vw,80px); align-items:center; }

.section-head{ max-width:760px; margin-bottom:54px; }
.section-head h2{ margin-top:18px; }
.section-head p{ margin-top:18px; color:var(--ink-dim); font-size:18px; }
.section-head.center{ margin-inline:auto; text-align:center; }

/* page hero (interior) */
.phero{ padding:clamp(56px,8vw,110px) 0 clamp(40px,5vw,70px); position:relative; overflow:hidden; border-bottom:1px solid var(--line); }
.phero h1{ max-width:14ch; }
.phero p{ max-width:62ch; margin-top:22px; }
.crumb{ font-family:var(--f-mono); font-size:12px; letter-spacing:.1em; text-transform:uppercase; color:var(--ink-mute); margin-bottom:22px; text-align:right; }
.crumb b{ color:var(--yellow); font-weight:500; }

/* ---------- Responsive ---------- */
@media(max-width:1080px){
  .topbar .ti.tr{ display:none; }
  nav.menu{ display:none; }
  .cta-quote{ display:none; }
  .burger{ display:grid; place-items:center; }
  .g4{ grid-template-columns:repeat(2,1fr); }
  .foot-main{ grid-template-columns:1fr 1fr; gap:32px; }
}
@media(max-width:760px){
  body{ font-size:16px; }
  header.site .brand .bs{ display:none; }
  .split{ grid-template-columns:1fr; }
  .g2,.g3,.g4{ grid-template-columns:1fr; }
  .foot-main{ grid-template-columns:1fr; }
  .topbar .ti.tl span:not(.chip){ display:none; }
  .nav-right .lang{ order:-1; }
}

/* utility */
.center{ text-align:center; }
.mt-s{ margin-top:14px; } .mt{ margin-top:26px; } .mt-l{ margin-top:44px; }
.yellow{ color:var(--yellow); }
.hide{ display:none !important; }