*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;min-height:100vh;
  background:var(--ink-0);color:var(--text);
  font-family:var(--font-sans);font-size:var(--fs-body);line-height:1.6;
  font-feature-settings:'ss01','cv11';
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
html[dir="rtl"] body{line-height:1.8}
h1,h2,h3,h4{margin:0;font-weight:600;line-height:1.02;letter-spacing:var(--track-tight);text-wrap:balance}
h1{font-size:var(--fs-hero);font-weight:640}
h2{font-size:var(--fs-h2)}
h3{font-size:var(--fs-h3);letter-spacing:-.02em;line-height:1.15}
p{margin:0;text-wrap:pretty}
a{color:inherit;text-decoration:none}
img,svg,video,canvas{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
::selection{background:rgba(192,132,252,.35);color:#fff}
:focus-visible{outline:2px solid #C084FC;outline-offset:3px;border-radius:6px}

.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.section{position:relative;padding-block:var(--section)}
.lead{font-size:var(--fs-lead);color:var(--muted);max-width:56ch;line-height:1.55}
.muted{color:var(--muted)}
.eyebrow{
  display:inline-flex;align-items:center;gap:.7em;
  font-family:var(--font-mono);font-size:var(--fs-eyebrow);font-weight:500;
  letter-spacing:var(--track-eyebrow);text-transform:uppercase;color:var(--muted);
}
.eyebrow::before{content:"";width:28px;height:1px;background:var(--iris)}
html[dir="rtl"] .eyebrow{letter-spacing:0}

.grad-text{
  font-family:var(--font-serif);font-style:italic;font-weight:400;letter-spacing:-.01em;
  background:var(--iris);-webkit-background-clip:text;background-clip:text;color:transparent;
  padding-inline-end:.06em;
}
html[dir="rtl"] .grad-text{font-family:var(--font-sans);font-style:normal;font-weight:700}
/* l'arabe porte des signes au-dessus et au-dessous des lettres : un interligne serré les rogne,
   surtout sur le texte en dégradé (background-clip:text s'arrête à la boîte de la ligne) */
html[dir="rtl"] h1,html[dir="rtl"] h2,html[dir="rtl"] h3{line-height:1.35;letter-spacing:0}
html[dir="rtl"] .grad-text{padding-block:.14em}

.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

.grain{
  position:fixed;inset:0;z-index:1;pointer-events:none;opacity:.035;
  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='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.aurora{
  position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden;
  background:radial-gradient(120% 80% at 50% 120%,rgba(255,255,255,.035),transparent 60%);
}
/* les halos glissent avec l'avancement de la page (--sy) : transform seulement, aucune repeinte */
.aurora::before,.aurora::after{content:"";position:absolute;width:120vw;height:100vh;border-radius:50%;will-change:transform}
.aurora::before{
  left:-40vw;top:-40vh;background:radial-gradient(closest-side,rgba(168,85,247,.16),transparent);
  transform:translate3d(calc(var(--sy,0) * 36vw),calc(var(--sy,0) * 40vh),0);
}
.aurora::after{
  left:25vw;top:20vh;width:100vw;height:90vh;background:radial-gradient(closest-side,rgba(236,72,153,.11),transparent);
  transform:translate3d(calc(var(--sy,0) * -30vw),calc(var(--sy,0) * -30vh),0);
}
.vignette{position:fixed;inset:0;z-index:1;pointer-events:none;background:radial-gradient(130% 100% at 50% 40%,transparent 55%,rgba(0,0,0,.55))}
main,header,footer{position:relative;z-index:2}

.chapter{
  display:flex;align-items:baseline;gap:14px;margin-bottom:28px;
  font-family:var(--font-mono);font-size:var(--fs-eyebrow);letter-spacing:var(--track-eyebrow);color:var(--dim);text-transform:uppercase;
}
.chapter b{font-weight:500;color:var(--text)}
.chapter::after{content:"";flex:1;height:1px;background:var(--line);transform:translateY(-3px)}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}