/* VitaFlow — site vitrine. Direction éditoriale : papier, encre, un seul accent (pétrole du logo).
   Polices auto-hébergées (OFL), aucune ressource externe. RTL natif via propriétés logiques. */
@font-face{font-family:"Inter";font-style:normal;font-weight:400 700;font-display:swap;
  src:url("fonts/inter-latin.woff2") format("woff2");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Inter";font-style:normal;font-weight:400 700;font-display:swap;
  src:url("fonts/inter-latin-ext.woff2") format("woff2");
  unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Newsreader";font-style:normal;font-weight:300 600;font-display:swap;
  src:url("fonts/newsreader-latin.woff2") format("woff2");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Newsreader";font-style:normal;font-weight:300 600;font-display:swap;
  src:url("fonts/newsreader-latin-ext.woff2") format("woff2");
  unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}

@font-face{font-family:"Amiri";font-style:normal;font-weight:400;font-display:swap;src:url("fonts/amiri-arabic-400-normal.woff2") format("woff2");unicode-range:U+0600-06FF,U+0750-077F,U+0870-088E,U+0890-0891,U+0898-08E1,U+08E3-08FF,U+200C-200E,U+2010-2011,U+204F,U+2E41,U+FB50-FDFF,U+FE70-FE74,U+FE76-FEFC}
@font-face{font-family:"Amiri";font-style:normal;font-weight:700;font-display:swap;src:url("fonts/amiri-arabic-700-normal.woff2") format("woff2");unicode-range:U+0600-06FF,U+0750-077F,U+0870-088E,U+0890-0891,U+0898-08E1,U+08E3-08FF,U+200C-200E,U+2010-2011,U+204F,U+2E41,U+FB50-FDFF,U+FE70-FE74,U+FE76-FEFC}
@font-face{font-family:"IBM Plex Sans Arabic";font-style:normal;font-weight:400;font-display:swap;src:url("fonts/ibm-plex-sans-arabic-arabic-400-normal.woff2") format("woff2");unicode-range:U+0600-06FF,U+0750-077F,U+0870-088E,U+0890-0891,U+0898-08E1,U+08E3-08FF,U+200C-200E,U+2010-2011,U+204F,U+2E41,U+FB50-FDFF,U+FE70-FE74,U+FE76-FEFC}
@font-face{font-family:"IBM Plex Sans Arabic";font-style:normal;font-weight:500 700;font-display:swap;src:url("fonts/ibm-plex-sans-arabic-arabic-500-normal.woff2") format("woff2");unicode-range:U+0600-06FF,U+0750-077F,U+0870-088E,U+0890-0891,U+0898-08E1,U+08E3-08FF,U+200C-200E,U+2010-2011,U+204F,U+2E41,U+FB50-FDFF,U+FE70-FE74,U+FE76-FEFC}

:root{
  --paper:#f5f2ea; --paper-2:#ece7da; --plate:#fbfaf6;
  --ink:#1c1e1d; --ink-2:#4f524c; --ink-3:#7f8177;
  --rule:#d6cfbf; --rule-2:#e4dfd2;
  --accent:#0e5566; --accent-2:#0a4250; --accent-soft:#d9e4e2;
  --on-ink:#f5f2ea;
  --serif:"Newsreader",Georgia,"Times New Roman",serif;
  --sans:"Inter",-apple-system,"Segoe UI",Roboto,system-ui,sans-serif;
  --mono:ui-monospace,"Cascadia Mono",Consolas,monospace;
  --wrap:1240px; --gut:clamp(16px,4vw,40px);
  --ease:cubic-bezier(.2,.7,.2,1);
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root{
  --paper:#131514; --paper-2:#1a1d1b; --plate:#181b19;
  --ink:#ebe7dc; --ink-2:#b5b1a4; --ink-3:#86857b;
  --rule:#34362f; --rule-2:#272a26;
  --accent:#86bcc5; --accent-2:#a9d2d8; --accent-soft:#1d3135;
  --on-ink:#131514; color-scheme:dark;
}}
html[lang="ar"]{
  --serif:"Amiri","Newsreader",Georgia,serif;
  --sans:"IBM Plex Sans Arabic","Inter","Segoe UI",Tahoma,sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:1.0625rem;line-height:1.62;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}
html[lang="ar"] body{font-size:1.125rem;line-height:1.8}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
h1,h2,h3{font-family:var(--serif);font-weight:400;letter-spacing:-.012em;line-height:1.08;margin:0}
html[lang="ar"] h1,html[lang="ar"] h2,html[lang="ar"] h3{letter-spacing:0;line-height:1.35}
p{margin:0}
.wrap{max-width:var(--wrap);margin:0 auto;padding-inline:var(--gut)}
.skip{position:absolute;inset-inline-start:-999px;top:8px;background:var(--ink);color:var(--paper);padding:8px 12px;z-index:50}
.skip:focus{inset-inline-start:8px}

/* ---------- En-tête ---------- */
.masthead{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--paper) 94%,transparent);
  backdrop-filter:saturate(1.2) blur(6px);border-bottom:1px solid var(--rule)}
.masthead .wrap{display:flex;align-items:center;gap:28px;height:68px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.brand img{width:30px;height:30px}
.brand b{font-family:var(--serif);font-weight:500;font-size:1.42rem;letter-spacing:-.01em;line-height:1}
.brand small{font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);border-inline-start:1px solid var(--rule);padding-inline-start:10px;margin-inline-start:2px}
html[lang="ar"] .brand small{letter-spacing:0;font-size:.8rem}
.nav{display:flex;align-items:center;gap:26px;margin-inline-start:auto}
.nav a{font-size:.84rem;text-decoration:none;color:var(--ink-2);letter-spacing:.02em;padding-block:6px;border-bottom:1px solid transparent}
html[lang="ar"] .nav a{font-size:.98rem}
.nav a:hover{color:var(--ink)}
.nav a[aria-current="page"]{color:var(--ink);border-bottom-color:var(--ink)}
.langs{display:flex;gap:2px;font-size:.78rem;border-inline-start:1px solid var(--rule);padding-inline-start:18px}
.langs a{text-decoration:none;color:var(--ink-3);padding:4px 7px;letter-spacing:.06em}
.langs a[aria-current="true"]{color:var(--ink);box-shadow:inset 0 -1px 0 var(--ink)}
.burger{display:none;margin-inline-start:auto;background:none;border:1px solid var(--rule);color:var(--ink);font:inherit;font-size:.8rem;
  letter-spacing:.1em;text-transform:uppercase;padding:8px 12px;cursor:pointer}

/* ---------- Boutons ---------- */
.btn{display:inline-flex;align-items:center;gap:10px;font-size:.92rem;font-weight:500;text-decoration:none;padding:13px 22px;
  border:1px solid var(--ink);color:var(--ink);background:transparent;transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);cursor:pointer;font-family:var(--sans)}
.btn:hover{background:var(--ink);color:var(--paper)}
.btn.solid{background:var(--ink);color:var(--paper)}
.btn.solid:hover{background:var(--accent);border-color:var(--accent);color:var(--paper)}
.btn .arr{display:inline-block;transition:transform .2s var(--ease)}
.btn:hover .arr{transform:translateX(3px)}
[dir="rtl"] .btn .arr{transform:scaleX(-1)}
[dir="rtl"] .btn:hover .arr{transform:scaleX(-1) translateX(3px)}
.link{font-size:.92rem;color:var(--accent);text-decoration:none;border-bottom:1px solid currentColor;padding-bottom:1px}

/* ---------- Typographie éditoriale ---------- */
.eyebrow{display:flex;align-items:center;gap:14px;font-size:.74rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-2);margin-bottom:28px}
.eyebrow::before{content:"";width:36px;height:1px;background:var(--ink)}
html[lang="ar"] .eyebrow{letter-spacing:0;font-size:.9rem}
.lede{font-size:1.18rem;color:var(--ink-2);max-width:38ch}
html[lang="ar"] .lede{font-size:1.25rem}
em.ac{font-style:italic;color:var(--accent)}
html[lang="ar"] em.ac{font-style:normal}

/* ---------- Héros ---------- */
.hero{padding-block:clamp(40px,6vw,84px) clamp(32px,4vw,52px)}
.hero .grid{display:grid;grid-template-columns:minmax(0,7.4fr) minmax(0,4.6fr);gap:clamp(28px,5vw,72px);align-items:end}
.hero h1{font-size:clamp(2.5rem,5.2vw,4.5rem);font-weight:300}
html[lang="ar"] .hero h1{font-size:clamp(2.2rem,5.2vw,4.3rem);font-weight:400}
.hero .side{display:grid;gap:28px;padding-bottom:10px}
.actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center}

/* ---------- Signature : la chaîne du lot ---------- */
.chain-band{border-block:1px solid var(--ink);background:var(--paper)}
.chain{position:relative;padding-block:34px 30px}
.chain-head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);margin-bottom:26px}
html[lang="ar"] .chain-head{letter-spacing:0;font-size:.88rem}
html[lang="ar"] .chain-head output{font-family:var(--sans);font-size:.95rem}
.chain-head output{font-family:var(--mono);letter-spacing:.04em;text-transform:none;color:var(--ink-2);min-height:1.2em;text-align:end}
.rail{position:relative}
.chain ol{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(5,1fr);position:relative}
.chain .track{position:absolute;inset-inline:calc(10% - 0px);top:7px;height:1px;background:var(--rule)}
.chain .track i{position:absolute;inset-block:0;inset-inline-start:0;width:calc(var(--p,0)*100%);background:var(--ink);transition:background .4s}
.chain.recall .track i{background:var(--accent)}
.chain .lot{position:absolute;top:1px;inset-inline-start:calc(10% + var(--p,0)*80%);width:13px;height:13px;margin-inline-start:-6.5px;border-radius:50%;
  background:var(--accent);box-shadow:0 0 0 5px color-mix(in srgb,var(--accent) 18%,transparent)}
.chain li{position:relative;padding-top:34px;padding-inline:8px;text-align:center}
.chain li::before{content:"";position:absolute;top:2px;inset-inline-start:calc(50% - 6px);width:11px;height:11px;border-radius:50%;
  border:1px solid var(--ink);background:var(--paper);transition:background .35s var(--ease),border-color .35s}
.chain li.on::before{background:var(--ink)}
.chain.recall li.hit::before{background:var(--accent);border-color:var(--accent)}
.chain li .n{display:block;font-family:var(--serif);font-style:italic;color:var(--ink-3);font-size:.95rem;margin-bottom:4px}
.chain li b{display:block;font-family:var(--serif);font-weight:400;font-size:1.32rem;line-height:1.15;margin-bottom:6px}
.chain li span{display:block;font-size:.82rem;color:var(--ink-2);line-height:1.45;max-width:22ch;margin-inline:auto}
html[lang="ar"] .chain li span{font-size:.95rem}
.chain-foot{margin-top:22px;font-size:.84rem;color:var(--ink-3);display:flex;gap:10px;align-items:center}
.chain-foot::before{content:"";width:18px;height:0;border-top:1px dashed var(--accent)}

/* ---------- Faits ---------- */
.facts{display:grid;grid-template-columns:repeat(4,1fr);border-bottom:1px solid var(--rule)}
.fact{padding:30px 22px 26px;border-inline-start:1px solid var(--rule)}
.fact:first-child{border-inline-start:0;padding-inline-start:0}
.fact b{display:block;font-family:var(--serif);font-weight:300;font-size:clamp(2.4rem,4.4vw,3.4rem);line-height:1;margin-bottom:10px;font-variant-numeric:lining-nums}
.fact span{font-size:.88rem;color:var(--ink-2);display:block;max-width:24ch}
html[lang="ar"] .fact span{font-size:1rem}
.facts-note{font-size:.8rem;color:var(--ink-3);padding-block:14px 0}

/* ---------- Sections numérotées ---------- */
.sec{padding-block:clamp(64px,9vw,120px)}
.sec + .sec{padding-top:0}
.sec-head{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,9fr);gap:clamp(20px,4vw,56px);border-top:1px solid var(--ink);padding-top:22px;margin-bottom:clamp(36px,5vw,64px)}
.sec-num{font-family:var(--serif);font-size:.95rem;color:var(--ink-3);letter-spacing:.02em}
.sec-num b{display:block;font-weight:300;font-size:clamp(2.6rem,4vw,3.4rem);color:var(--ink);line-height:1;margin-bottom:6px}
.sec-head h2{font-size:clamp(2rem,4vw,3.3rem);font-weight:300;max-width:18ch;margin-bottom:18px}
html[lang="ar"] .sec-head h2{font-weight:400}
.sec-head p{color:var(--ink-2);max-width:60ch;font-size:1.08rem}

/* listes réglées */
.ruled{list-style:none;margin:0;padding:0;border-bottom:1px solid var(--rule)}
.ruled li{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,8fr);gap:clamp(16px,3vw,40px);padding-block:20px;border-top:1px solid var(--rule)}
.ruled li b{font-family:var(--serif);font-weight:400;font-size:1.28rem;line-height:1.25}
.ruled li span{color:var(--ink-2)}
.cols{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,9fr);gap:clamp(20px,4vw,56px)}
.cols > aside{font-size:.88rem;color:var(--ink-3)}

/* planches (captures réelles) */
.plate{margin:0}
.plate .frame{border:1px solid var(--rule);background:var(--plate);padding:clamp(8px,1.4vw,16px)}
.plate .frame img{border:1px solid var(--rule-2);width:100%}
.plate figcaption{display:flex;gap:14px;align-items:baseline;font-size:.84rem;color:var(--ink-2);padding-top:12px}
.plate figcaption i{font-family:var(--serif);font-style:italic;color:var(--ink-3);white-space:nowrap}
html[lang="ar"] .plate figcaption i{font-style:normal}
.plate.phone{max-width:300px}
.plate-wide{margin-block:clamp(36px,5vw,64px)}

.split{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:clamp(28px,5vw,72px);align-items:start}
.split.rev{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.split h3{font-size:clamp(1.6rem,2.6vw,2.1rem);font-weight:300;margin-bottom:16px}
.split p{color:var(--ink-2)}
.split p + p{margin-top:14px}
.split .more{margin-top:22px}
.split + .split{margin-top:clamp(56px,7vw,96px)}

/* chapitres (page Fonctions) */
.chapter{padding-block:clamp(56px,7vw,96px);border-top:1px solid var(--rule)}
.chapter:first-of-type{border-top:0}
.chapter .cols{align-items:start}
.chapter h2{font-size:clamp(1.9rem,3.4vw,2.8rem);font-weight:300;margin-bottom:14px}
.chapter .intro{color:var(--ink-2);font-size:1.08rem;max-width:58ch;margin-bottom:30px}
.chapter .plate{margin-top:36px}
.toc{list-style:none;margin:0;padding:0;position:sticky;top:96px}
.toc li{border-top:1px solid var(--rule)}
.toc a{display:flex;gap:12px;padding:10px 0;text-decoration:none;font-size:.9rem;color:var(--ink-2)}
.toc a i{font-family:var(--serif);color:var(--ink-3);min-width:2ch}
.toc a:hover{color:var(--ink)}

/* encadré limites */
.limits{background:var(--paper-2);border-top:1px solid var(--ink)}
.limits .ruled li{border-top-color:color-mix(in srgb,var(--ink) 18%,transparent)}

/* appel à l'action */
.cta{background:var(--ink);color:var(--paper)}
.cta .wrap{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:clamp(28px,5vw,72px);padding-block:clamp(64px,9vw,112px);align-items:end}
.cta h2{font-size:clamp(2.2rem,4.6vw,3.8rem);font-weight:300;color:var(--paper)}
.cta p{color:color-mix(in srgb,var(--paper) 72%,transparent);margin-bottom:26px}
.cta .btn{border-color:var(--paper);color:var(--paper)}
.cta .btn:hover{background:var(--paper);color:var(--ink)}
.cta .btn.solid{background:var(--paper);color:var(--ink)}
.cta .btn.solid:hover{background:var(--accent-2);border-color:var(--accent-2);color:#fff}
@media (prefers-color-scheme:dark){.cta{background:var(--paper-2);color:var(--ink);border-top:1px solid var(--rule)}
  .cta h2{color:var(--ink)} .cta p{color:var(--ink-2)}
  .cta .btn{border-color:var(--ink);color:var(--ink)} .cta .btn.solid{background:var(--ink);color:var(--paper)}}

/* page intérieure : en-tête */
.page-head{padding-block:clamp(56px,8vw,104px) clamp(36px,5vw,56px);border-bottom:1px solid var(--ink)}
.page-head h1{font-size:clamp(2.5rem,5.6vw,4.6rem);font-weight:300;max-width:16ch;margin-bottom:24px}
html[lang="ar"] .page-head h1{font-weight:400}
.page-head .lede{max-width:56ch}

/* contact */
.form{display:grid;gap:18px}
.form .row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.form label{display:grid;gap:6px;font-size:.8rem;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-2)}
html[lang="ar"] .form label{letter-spacing:0;font-size:.95rem}
.form input,.form select,.form textarea{font:inherit;font-size:1rem;text-transform:none;letter-spacing:0;color:var(--ink);background:transparent;border:0;border-bottom:1px solid var(--ink-3);padding:10px 0;border-radius:0}
.form textarea{min-height:130px;resize:vertical;border:1px solid var(--ink-3);padding:12px}
.form input:focus,.form select:focus,.form textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 1px 0 var(--accent)}
.form .hint{font-size:.82rem;color:var(--ink-3)}
.steps{counter-reset:s;list-style:none;margin:0;padding:0}
.steps li{counter-increment:s;display:grid;grid-template-columns:44px 1fr;gap:12px;padding-block:18px;border-top:1px solid var(--rule)}
.steps li::before{content:counter(s,upper-roman);font-family:var(--serif);font-style:italic;color:var(--ink-3)}
.steps b{font-family:var(--serif);font-weight:400;font-size:1.2rem;display:block;margin-bottom:4px}
.steps span{color:var(--ink-2)}
.direct{border-top:1px solid var(--ink);padding-top:18px;margin-top:36px}
.direct a{font-family:var(--serif);font-size:1.5rem;text-decoration:none;border-bottom:1px solid var(--rule)}

/* pied de page */
.foot{border-top:1px solid var(--ink);padding-block:44px 36px;font-size:.86rem;color:var(--ink-2)}
.foot .grid{display:grid;grid-template-columns:minmax(0,5fr) repeat(2,minmax(0,2.4fr));gap:32px}
.foot h4{font-family:var(--sans);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);font-weight:500;margin:0 0 12px}
html[lang="ar"] .foot h4{letter-spacing:0;font-size:.85rem}
.foot ul{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.foot a{text-decoration:none}
.foot .legal{margin-top:36px;padding-top:16px;border-top:1px solid var(--rule);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;color:var(--ink-3);font-size:.8rem}

/* révélation discrète au défilement */
.rv{opacity:0;transform:translateY(14px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.rv.in{opacity:1;transform:none}
.no-js .rv{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.rv{opacity:1;transform:none;transition:none}.chain .track i,.chain li::before{transition:none}}

/* ---------- Adaptatif ---------- */
@media (max-width:1000px){
  .nav{display:none;position:absolute;top:68px;inset-inline:0;flex-direction:column;align-items:stretch;gap:0;background:var(--paper);border-bottom:1px solid var(--ink);padding:8px var(--gut) 18px}
  .nav.open{display:flex}
  .nav a{padding-block:14px;border-bottom:1px solid var(--rule);font-size:1rem}
  .langs{border:0;padding:14px 0 0}
  .burger{display:block}
  .hero .grid,.cta .wrap,.split,.split.rev,.sec-head,.cols,.foot .grid{grid-template-columns:1fr}
  .toc{display:none}
  .facts{grid-template-columns:1fr 1fr}
  .fact:nth-child(3){border-inline-start:0;padding-inline-start:0}
  .fact:nth-child(n+3){border-top:1px solid var(--rule)}
  .split.rev > :first-child{order:2}
}
@media (max-width:720px){
  .chain ol{grid-template-columns:1fr;gap:0}
  .chain .track{inset-inline:auto;inset-inline-start:5px;top:8px;bottom:8px;width:1px;height:auto}
  .chain .track i{width:1px;height:calc(var(--p,0)*100%)}
  .chain .lot{inset-inline-start:-1px;margin-inline-start:0;top:calc(4px + var(--p,0)*(100% - 26px))}
  .chain li{text-align:start;padding:0 0 22px 34px;padding-inline:34px 0}
  .chain li::before{top:4px;inset-inline-start:0}
  .chain li span{margin-inline:0;max-width:none}
  .chain-head{flex-direction:column;gap:6px}
  .chain-head output{text-align:start}
  .ruled li{grid-template-columns:1fr;gap:6px}
  .form .row{grid-template-columns:1fr}
  .brand small{display:none}
}
@media (max-width:420px){.facts{grid-template-columns:1fr}.fact{border-inline-start:0!important;padding-inline-start:0!important;border-top:1px solid var(--rule)}.fact:first-child{border-top:0}}
@media print{.masthead,.cta,.chain-band{display:none}.rv{opacity:1;transform:none}}
.form-col h3,.split > .rv > h3{margin-bottom:18px}
@media (max-width:1000px){.nav .langs a{border-bottom:0;padding:4px 10px 4px 0}}

/* =====================  v2 : signature et récit  ===================== */
:root{--ease-out:cubic-bezier(.16,1,.3,1)}
/* grain de papier */
body::after{content:"";position:fixed;inset:0;pointer-events:none;z-index:60;opacity:.07;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .55 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}
@media (prefers-color-scheme:dark){body::after{mix-blend-mode:screen;opacity:.05}}

/* titre cinétique */
.kin .w{display:inline-block;overflow:hidden;vertical-align:bottom;padding-bottom:.08em;margin-bottom:-.08em}
.kin .w>span{display:inline-block;transform:translateY(108%);animation:rise 1.1s var(--ease-out) forwards;animation-delay:calc(var(--i) * 55ms + 120ms)}
html[lang="ar"] .kin .w{padding-block:.12em;margin-block:-.12em}
@keyframes rise{to{transform:none}}
@media (prefers-reduced-motion:reduce){.kin .w>span{animation:none;transform:none}}
.hero .side{animation:fadeup 1.1s var(--ease-out) .55s both}
@keyframes fadeup{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){.hero .side{animation:none}}

/* ----- le flux ----- */
.flow{border-block:1px solid var(--ink);position:relative}
.flow-head{display:flex;justify-content:space-between;align-items:center;gap:16px;padding-block:18px 0;font-size:.74rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-3)}
html[lang="ar"] .flow-head{letter-spacing:0;font-size:.9rem}
.flow-follow{font:inherit;font-size:.8rem;letter-spacing:.06em;text-transform:none;color:var(--ink);background:transparent;border:1px solid var(--ink);padding:8px 14px;cursor:pointer;display:inline-flex;align-items:center;gap:10px}
.flow-follow::before{content:"";width:9px;height:9px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 20%,transparent)}
.flow-follow[aria-pressed="true"]{background:var(--ink);color:var(--paper)}
.flow-stage{position:relative;height:clamp(300px,44vh,470px);margin-top:0}
.flow-stage canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.flow-labels{position:absolute;inset:auto 0 -2px 0;height:0}
.flow-label{position:absolute;bottom:0;transform:translate(-50%,100%);white-space:nowrap;font-family:var(--serif);font-size:1.08rem;color:var(--ink);padding-top:10px;display:flex;flex-direction:column;align-items:center;gap:2px}
.flow-label i{font-size:.8rem;color:var(--ink-3)}
.flow-label.edge-s{transform:translate(-14%,100%)} .flow-label.edge-e{transform:translate(-86%,100%)}
[dir="rtl"] .flow-label.edge-s{transform:translate(-86%,100%)} [dir="rtl"] .flow-label.edge-e{transform:translate(-14%,100%)}
.flow-cap{padding-top:78px;padding-bottom:22px;font-size:.84rem;color:var(--ink-3);display:flex;gap:10px;align-items:baseline}
.flow-cap::before{content:"";flex:none;width:8px;height:8px;border-radius:50%;background:var(--accent);transform:translateY(-1px)}
.flow:not(.live) .flow-follow{display:none}
@media (max-width:720px){.flow-stage{height:300px}.flow-label{font-size:.84rem}.flow-label:nth-child(2),.flow-label:nth-child(4){display:none}.flow-cap{padding-top:64px}}

/* ----- domaines + aperçu ----- */
.domains b a{text-decoration:none;display:inline-flex;gap:14px;align-items:baseline;transition:color .25s}
.domains b a i{font-size:.85rem;color:var(--ink-3);font-style:italic;min-width:2ch}
.domains li{position:relative;transition:padding .35s var(--ease-out)}
.domains li::after{content:"";position:absolute;inset-inline-start:0;bottom:-1px;height:1px;width:0;background:var(--ink);transition:width .5s var(--ease-out)}
.domains li:hover::after{width:100%}
.domains li:hover b a{color:var(--accent)}
@media (hover:hover){.domains li:hover{padding-inline-start:14px}}
.peek{position:fixed;left:0;top:0;width:340px;z-index:40;pointer-events:none;opacity:0;transition:opacity .25s;border:1px solid var(--rule);background:var(--plate);padding:8px;box-shadow:0 30px 60px -30px rgba(0,0,0,.35)}
.peek.on{opacity:1}
.peek img{width:100%;border:1px solid var(--rule-2)}

/* ----- récit au défilement ----- */
.story-grid{display:grid;grid-template-columns:minmax(0,4.2fr) minmax(0,7.8fr);gap:clamp(28px,5vw,72px)}
.story-steps{list-style:none;margin:0;padding:0}
.step{min-height:68vh;display:flex;flex-direction:column;justify-content:center;border-top:1px solid var(--rule);padding-block:40px;opacity:.32;transition:opacity .5s var(--ease-out)}
.step.on{opacity:1}
.step-n{font-family:var(--serif);font-style:italic;color:var(--accent);font-size:1rem;margin-bottom:8px}
.step h3{font-size:clamp(2rem,3.4vw,2.9rem);font-weight:300;margin-bottom:16px}
.step p{color:var(--ink-2);max-width:40ch}
.step-plate{display:none}
.story-stage{position:sticky;top:calc(50vh - 260px);align-self:start;height:max-content;margin-top:20vh}
.story-stage .frame{position:relative;aspect-ratio:16/10;border:1px solid var(--rule);background:var(--plate);padding:clamp(8px,1.2vw,14px)}
.story-stage img{position:absolute;inset:clamp(8px,1.2vw,14px);width:calc(100% - 2*clamp(8px,1.2vw,14px));height:calc(100% - 2*clamp(8px,1.2vw,14px));object-fit:cover;object-position:top left;border:1px solid var(--rule-2);
  opacity:0;transform:scale(1.015);transition:opacity .6s var(--ease-out),transform .9s var(--ease-out)}
[dir="rtl"] .story-stage img{object-position:top right}
.story-stage img.on{opacity:1;transform:none}
.story-meta{display:flex;gap:16px;align-items:baseline;padding-top:12px;font-size:.84rem;color:var(--ink-2)}
.story-n{font-family:var(--serif);font-style:italic;color:var(--ink-3);white-space:nowrap}
.story-bar{height:1px;background:var(--rule);margin-top:12px;overflow:hidden}
.story-bar i{display:block;height:1px;background:var(--ink);transform-origin:left;transform:scaleX(.2);transition:transform .6s var(--ease-out)}
[dir="rtl"] .story-bar i{transform-origin:right}
@media (prefers-reduced-motion:reduce){.story-stage img,.step,.story-bar i{transition:none}}
@media (max-width:1000px){.story-grid{grid-template-columns:1fr}.story-stage{display:none}.step{min-height:0;opacity:1}.step-plate{display:block;margin-top:24px}}

/* ----- rappel (bande sombre) ----- */
.trace{background:#141716;color:#ece8de;padding-block:clamp(72px,10vw,128px);--tr-rule:#3a3e3a;--tr-dim:#a19f95;--tr-acc:#7fc0c9}
.trace .eyebrow{color:var(--tr-dim)} .trace .eyebrow::before{background:#ece8de}
.trace-head{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:clamp(24px,5vw,72px);align-items:end;margin-bottom:clamp(36px,5vw,64px)}
.trace-head .eyebrow{grid-column:1/-1;margin-bottom:0}
.trace-head h2{font-size:clamp(2.2rem,4.6vw,3.9rem);font-weight:300;color:#f3efe5}
.trace-head p{color:var(--tr-dim)}
.trace-graph{width:100%;height:auto;display:block;border-block:1px solid var(--tr-rule);padding-block:18px;overflow:visible}
.trace-graph .tl{fill:none;stroke:var(--tr-acc);stroke-width:1.4;stroke-dasharray:1;stroke-dashoffset:1;transition:stroke-dashoffset 1.1s var(--ease-out);transition-delay:calc(var(--d) * 260ms)}
.trace-graph .tl.ink{stroke:#ece8de;stroke-width:1}
.trace-graph .tn{fill:#141716;stroke:var(--tr-acc);stroke-width:1.4;opacity:0;transition:opacity .5s;transition-delay:calc(var(--d) * 260ms + 200ms)}
.trace-graph .tn.ink{stroke:#ece8de}
.trace-graph .tn.big{fill:var(--tr-acc)}
.trace-graph text{fill:#ece8de;font-family:var(--sans);font-size:15px;opacity:0;transition:opacity .6s;transition-delay:calc(var(--d) * 260ms + 300ms)}
.trace-graph .tt{font-family:var(--serif);font-size:19px}
.trace-graph .tt.big{font-size:23px;fill:var(--tr-acc)}
.trace-graph .ts{fill:var(--tr-dim);font-size:13.5px}
.trace-graph .ts.pend{font-style:italic}
.trace-graph .tn-l{fill:var(--tr-acc);font-size:13px;letter-spacing:.06em}
.trace-graph .mono{font-family:var(--mono);font-size:15px}
.trace-graph.drawn .tl{stroke-dashoffset:0}
.trace-graph.drawn .tn,.trace-graph.drawn text{opacity:1}
@media (prefers-reduced-motion:reduce){.trace-graph .tl{stroke-dashoffset:0;transition:none}.trace-graph .tn,.trace-graph text{opacity:1;transition:none}}
.no-js .trace-graph .tl{stroke-dashoffset:0}.no-js .trace-graph .tn,.no-js .trace-graph text{opacity:1}
.trace-list{display:none;list-style:none;margin:0;padding:0;border-top:1px solid var(--tr-rule)}
.trace-list li{display:grid;gap:2px;padding-block:12px;padding-inline:22px 0;border-bottom:1px solid var(--tr-rule);position:relative}
.trace-list li::before{content:"";position:absolute;inset-inline-start:2px;top:19px;width:7px;height:7px;border-radius:50%;border:1px solid var(--tr-acc)}
.trace-list b{font-family:var(--serif);font-weight:400;font-size:1.1rem}
.trace-list span{color:var(--tr-dim);font-size:.9rem}
.trace-stats{display:grid;grid-template-columns:repeat(3,1fr);margin-top:clamp(32px,4vw,48px)}
.trace-stats div{padding:6px 22px;border-inline-start:1px solid var(--tr-rule)}
.trace-stats div:first-child{border:0;padding-inline-start:0}
.trace-stats b{display:block;font-family:var(--serif);font-weight:300;font-size:clamp(2.8rem,5vw,4.2rem);line-height:1;color:var(--tr-acc)}
.trace-stats span{color:var(--tr-dim);font-size:.9rem}
.trace-note{margin-top:28px;font-size:.8rem;color:var(--tr-dim)}
@media (max-width:820px){.trace-head{grid-template-columns:1fr}.trace-graph{display:none}.trace-list{display:block}.trace-stats{grid-template-columns:1fr}.trace-stats div{border:0;padding:14px 0;border-top:1px solid var(--tr-rule)}}
.flow.mini{border-top:0}
.flow.mini .flow-stage{height:clamp(150px,22vh,220px)}
@media (max-width:720px){.flow.mini .flow-stage{height:140px}}

/* =====================  v3 : page Fonctions en récit  ===================== */
.ch-nav{position:sticky;top:68px;z-index:15;background:color-mix(in srgb,var(--paper) 94%,transparent);backdrop-filter:blur(6px);border-bottom:1px solid var(--rule)}
.ch-nav ol{list-style:none;margin:0;padding:0;display:flex;gap:4px;overflow-x:auto;scrollbar-width:none}
.ch-nav ol::-webkit-scrollbar{display:none}
.ch-nav a{display:flex;gap:8px;align-items:baseline;white-space:nowrap;padding:14px 12px 13px;text-decoration:none;font-size:.86rem;color:var(--ink-3);border-bottom:1px solid transparent;transition:color .25s,border-color .25s}
html[lang="ar"] .ch-nav a{font-size:.98rem}
.ch-nav a i{font-family:var(--serif);font-style:italic;font-size:.82rem}
.ch-nav a:hover{color:var(--ink)}
.ch-nav a.on{color:var(--ink);border-bottom-color:var(--accent)}
.ch-nav a.on i{color:var(--accent)}
.ch-progress{height:2px;background:transparent;position:absolute;inset-inline:0;bottom:-1px}
.ch-progress i{display:block;height:2px;background:var(--accent);transform-origin:left;transform:scaleX(0)}
[dir="rtl"] .ch-progress i{transform-origin:right}

.chapters .chapter{padding-block:clamp(64px,8vw,112px) clamp(24px,3vw,40px);border-top:1px solid var(--rule);scroll-margin-top:120px}
.chapters .chapter:first-child{border-top:0}
.ch-head{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,9fr);gap:clamp(20px,4vw,56px);margin-bottom:clamp(20px,3vw,36px)}
.ch-head h2{font-size:clamp(2.2rem,4.4vw,3.6rem);font-weight:300;margin-bottom:14px}
.ch-head .intro{color:var(--ink-2);font-size:1.1rem;max-width:56ch;margin:0}
.ch-grid{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:clamp(28px,5vw,72px)}
.feats{list-style:none;margin:0;padding:0}
.feat{min-height:44vh;display:flex;flex-direction:column;justify-content:center;gap:10px;border-top:1px solid var(--rule);padding-block:32px;opacity:.3;transition:opacity .5s var(--ease-out)}
.feat:last-child{border-bottom:1px solid var(--rule)}
.feat.on{opacity:1}
.feat b{font-family:var(--serif);font-weight:400;font-size:clamp(1.5rem,2.4vw,2rem);line-height:1.15}
.feat > span{color:var(--ink-2);max-width:44ch}
.ch-stage{position:sticky;top:calc(50vh - 190px);align-self:start;margin-top:18vh}
.ch-stage .frame{position:relative;aspect-ratio:16/10;border:1px solid var(--rule);background:var(--plate)}
.ch-stage img{position:absolute;inset:clamp(8px,1.2vw,14px);width:calc(100% - 2*clamp(8px,1.2vw,14px));height:calc(100% - 2*clamp(8px,1.2vw,14px));object-fit:cover;object-position:top left;border:1px solid var(--rule-2);
  opacity:0;transform:translateY(10px);transition:opacity .55s var(--ease-out),transform .8s var(--ease-out)}
[dir="rtl"] .ch-stage img{object-position:top right}
.ch-stage img[data-fit="contain"]{object-fit:contain;object-position:center;border:0;background:transparent}
.ch-stage img.on{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.feat,.ch-stage img{transition:none}}
@media (max-width:1000px){
  .ch-nav{top:68px}
  .ch-head{grid-template-columns:1fr}
  .ch-grid{grid-template-columns:1fr}
  .ch-stage{display:none}
  .feat{min-height:0;opacity:1}
  .step-plate{display:block;margin-top:14px}
  .feat .step-plate img[src*="terrain_"]{max-width:260px}
}

/* accès à l'application */
.nav a.login{border:1px solid var(--ink);padding:7px 14px;color:var(--ink);letter-spacing:.03em;transition:background .25s,color .25s}
.nav a.login:hover{background:var(--ink);color:var(--paper)}
@media (max-width:1000px){.nav a.login{margin-top:14px;text-align:center;border-bottom:1px solid var(--ink)}}
.nav a{white-space:nowrap}
@media (min-width:1001px) and (max-width:1240px){.masthead .brand small{display:none}.nav{gap:18px}}