/* ─── inegalites.css — Thème : Contraste saisissant, fracture sociale ───────── */
@import url('https://fonts.googleapis.com/css2?family=Unbounded:wght@300;400;600;700;900&family=Literata:ital,opsz,wght@0,7..72,300;0,7..72,400;0,7..72,600;1,7..72,300;1,7..72,400&family=Space+Mono:ital,wght@0,400;0,700;1,400&display=swap');

:root {
  --black:#050505; --near-black:#0c0c0c; --surface:#141414;
  --white:#f8f8f8; --white-2:#f0f0f0; --white-3:#e4e4e4;
  --purple:#7c3aed; --purple-2:#9333ea; --purple-pale:rgba(124,58,237,.1);
  --purple-glow:rgba(124,58,237,.25); --purple-mid:#c4b5fd;
  --gold:#d97706; --gold-pale:rgba(217,119,6,.09);
  --red:#dc2626; --red-pale:rgba(220,38,38,.09);
  --teal:#0d9488; --teal-pale:rgba(13,148,136,.09);
  --border:rgba(124,58,237,.18); --border-hi:rgba(124,58,237,.5);
  --ink-dark:#1a1a1a; --ink-mid:#4a4a4a;
  --font-display:'Unbounded',sans-serif;
  --font-body:'Literata',Georgia,serif;
  --font-mono:'Space Mono',monospace;
  --sidebar-w:270px; --radius:6px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}

body{font-family:var(--font-body);background:var(--white);color:var(--ink-dark);font-size:17px;line-height:1.78;}

.progress-bar{position:fixed;top:0;left:0;height:4px;width:0%;background:linear-gradient(90deg,var(--purple),var(--purple-2),var(--gold));z-index:200;transition:width .08s linear;}

.page-layout{display:flex;min-height:100vh;}

/* Sidebar noire avec accents violet */
.sidebar{width:var(--sidebar-w);flex-shrink:0;background:var(--black);border-right:none;position:sticky;top:0;height:100vh;overflow-y:auto;display:flex;flex-direction:column;scrollbar-width:thin;scrollbar-color:var(--surface) transparent;}
.sidebar-header{padding:28px 22px 22px;border-bottom:1px solid var(--border);position:relative;overflow:hidden;}
.sidebar-header::after{content:'';position:absolute;bottom:0;left:0;right:0;height:1px;background:linear-gradient(90deg,var(--purple),transparent);}
.sidebar-site-link{font-family:var(--font-mono);font-size:.6rem;letter-spacing:.15em;color:rgba(255,255,255,.2);text-decoration:none;display:block;margin-bottom:12px;}
.sidebar-title{font-family:var(--font-display);font-size:1.05rem;font-weight:700;color:var(--white);line-height:1.3;letter-spacing:-.01em;}
.sidebar-title em{color:var(--purple-mid);font-style:normal;}
.toc-nav{padding:12px 0 16px;flex:1;}
.toc-section-label{font-family:var(--font-mono);font-size:.58rem;letter-spacing:.2em;text-transform:uppercase;color:rgba(255,255,255,.2);padding:10px 22px 4px;}
.toc-link{display:block;padding:5px 22px 5px 26px;font-family:var(--font-body);font-size:.84rem;color:rgba(255,255,255,.48);text-decoration:none;border-left:2px solid transparent;transition:all .15s;}
.toc-link:hover,.toc-link.active{color:var(--white);border-left-color:var(--purple);background:var(--purple-pale);}
.toc-link.active{color:var(--purple-mid);}
.sidebar-subject-nav{padding:14px 22px;border-top:1px solid var(--border);}
.sidebar-subject-nav p{font-family:var(--font-mono);font-size:.58rem;letter-spacing:.18em;text-transform:uppercase;color:rgba(255,255,255,.18);margin-bottom:8px;}
.sidebar-subject-nav a{display:block;font-family:var(--font-body);font-size:.82rem;color:rgba(255,255,255,.36);text-decoration:none;padding:3px 0;transition:color .15s;}
.sidebar-subject-nav a:hover{color:var(--purple-mid);}
.sidebar-subject-nav a.current{color:var(--purple-mid);font-weight:600;}

.main{flex:1;min-width:0;padding:0 62px 100px;max-width:840px;}

.page-header{padding:60px 0 40px;margin-bottom:54px;border-bottom:3px solid var(--ink-dark);position:relative;}
.page-header::after{content:'';position:absolute;bottom:-3px;left:0;width:80px;height:3px;background:var(--purple);}
.subject-tag{font-family:var(--font-display);font-size:.58rem;letter-spacing:.2em;text-transform:uppercase;color:var(--purple-2);margin-bottom:14px;font-weight:600;}
h1.page-title{font-family:var(--font-display);font-size:2.8rem;font-weight:900;color:var(--ink-dark);line-height:1.0;letter-spacing:-.03em;}
h1.page-title span{color:var(--purple);}
.page-intro{margin-top:18px;font-size:1rem;color:var(--ink-mid);font-style:italic;max-width:540px;font-family:var(--font-body);}

.section{margin-bottom:64px;scroll-margin-top:28px;}
h2.section-title{font-family:var(--font-display);font-size:1.35rem;font-weight:700;color:var(--ink-dark);margin-bottom:22px;padding-bottom:10px;border-bottom:1px solid var(--white-3);display:flex;align-items:center;gap:14px;letter-spacing:-.02em;}
h2.section-title .num{font-family:var(--font-mono);font-size:.72rem;color:var(--white);background:var(--purple);padding:3px 9px;border-radius:var(--radius);font-weight:400;}
h3.sub-title{font-family:var(--font-display);font-size:1rem;font-weight:700;color:var(--purple-2);margin:30px 0 12px;letter-spacing:-.01em;}
p{margin-bottom:.92em;}ul,ol{padding-left:1.4em;margin-bottom:.9em;}li{margin-bottom:.28em;}

.box{padding:17px 21px 15px;margin:20px 0;border-radius:var(--radius);}
.box-label{font-family:var(--font-display);font-size:.6rem;font-weight:700;letter-spacing:.15em;text-transform:uppercase;display:block;margin-bottom:8px;}
.box.def{background:var(--purple-pale);border:1px solid rgba(124,58,237,.3);border-left:5px solid var(--purple);}
.box.def .box-label{color:var(--purple-2);}
.box.theorem{background:var(--gold-pale);border:1px solid rgba(217,119,6,.25);border-left:5px solid var(--gold);}
.box.theorem .box-label{color:var(--gold);}
.box.prop{background:var(--teal-pale);border:1px solid rgba(13,148,136,.2);border-left:5px solid var(--teal);}
.box.prop .box-label{color:var(--teal);}
.box.corollary{background:var(--red-pale);border:1px solid rgba(220,38,38,.2);border-left:5px solid var(--red);}
.box.corollary .box-label{color:var(--red);}
.box.example{background:var(--white-2);border:1px solid var(--white-3);}
.box.example .box-label{color:var(--ink-mid);}
.box.remark{background:var(--white);border:1px dashed var(--white-3);}
.box.remark .box-label{color:rgba(74,74,74,.6);}

.proof-toggle{display:inline-flex;align-items:center;gap:6px;font-family:var(--font-display);font-size:.7rem;font-weight:700;letter-spacing:.05em;color:var(--purple);border:1px solid var(--purple);padding:5px 14px;border-radius:var(--radius);cursor:pointer;background:transparent;margin-top:8px;transition:all .15s;user-select:none;}
.proof-toggle:hover{background:var(--purple);color:var(--white);}
.proof-toggle .arrow{transition:transform .2s;}
.proof-toggle.open .arrow{transform:rotate(90deg);}
.proof-content{max-height:0;overflow:hidden;transition:max-height .3s ease;}
.proof-content.open{max-height:900px;}
.proof-inner{margin-top:12px;padding:14px 18px;background:var(--white-2);border:1px solid var(--white-3);border-radius:var(--radius);color:var(--ink-mid);font-size:.93rem;font-style:italic;}
.qed{float:right;color:var(--purple);font-family:var(--font-mono);font-size:.82rem;}

.formula-block{text-align:center;padding:20px 16px;margin:16px 0;background:var(--near-black);color:var(--white);border:1px solid var(--border);border-radius:var(--radius);overflow-x:auto;box-shadow:0 2px 12px rgba(124,58,237,.08);}

.math-table{width:100%;border-collapse:collapse;margin:16px 0;font-size:.91rem;border-radius:var(--radius);overflow:hidden;border:1px solid var(--white-3);}
.math-table th{background:var(--black);color:var(--white);padding:10px 14px;text-align:left;font-family:var(--font-display);font-size:.72rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;border-bottom:2px solid var(--purple);}
.math-table td{padding:9px 14px;border-bottom:1px solid var(--white-3);vertical-align:top;}
.math-table tr:nth-child(even) td{background:var(--white-2);}
.math-table td:first-child{font-family:var(--font-mono);font-size:.8rem;color:var(--purple-2);}
.math-table .hi{color:var(--red);font-weight:600;}
.math-table .lo{color:var(--teal);font-weight:600;}
code{font-family:var(--font-mono);font-size:.82em;background:var(--purple-pale);color:var(--purple-2);padding:2px 6px;border-radius:3px;border:1px solid rgba(124,58,237,.2);}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:14px 0;}
.two-col .box{margin:0;}

.mobile-header{display:none;position:sticky;top:0;z-index:50;background:var(--black);border-bottom:2px solid var(--purple);padding:12px 18px;align-items:center;justify-content:space-between;}
.mobile-menu-btn{background:none;border:none;color:var(--purple-mid);font-size:1.3rem;cursor:pointer;}
.mobile-title{font-family:var(--font-display);font-size:.9rem;font-weight:700;color:var(--white);letter-spacing:-.02em;}
.mobile-drawer{display:none;position:fixed;inset:0;z-index:100;}
.mobile-drawer.open{display:flex;}
.drawer-overlay{position:absolute;inset:0;background:rgba(0,0,0,.65);}
.drawer-panel{position:relative;z-index:1;width:270px;background:var(--black);height:100%;overflow-y:auto;padding:16px 0;border-right:1px solid var(--border);}
@media(max-width:960px){.sidebar{display:none;}.mobile-header{display:flex;}.main{padding:0 20px 70px;}h1.page-title{font-size:2.1rem;}.two-col{grid-template-columns:1fr;}}