/* ═══════════════════════════════════════════════════════════════════
   nigeria.css — Thème : Lagos néon, wax Ankara, Afrobeats
   Vert drapeau vibrant, magenta, cyan, jaune Naija sur fond crème chaud
   ═══════════════════════════════════════════════════════════════════ */
@import url('https://fonts.googleapis.com/css2?family=Bricolage+Grotesque:wght@400;500;600;700;800&family=Playfair+Display:ital,wght@0,700;0,800;1,600&family=JetBrains+Mono:wght@400;600&display=swap');

:root{
  --ink:#0d1014;
  --paper:#fbf7ef;
  --paper-2:#f0ebde;
  --ng-green:#008751;            /* vert drapeau Nigeria */
  --ng-green-d:#005c37;
  --ng-green-l:#00b870;
  --magenta:#d81e7a;
  --magenta-d:#a81458;
  --cyan:#00bcd4;
  --yellow:#ffc233;
  --orange:#ff6b35;
  --line:rgba(13,16,20,.12);
  --muted:#55606b;
  --fd:'Playfair Display',Georgia,serif;
  --fb:'Bricolage Grotesque',system-ui,sans-serif;
  --fm:'JetBrains Mono',monospace;
  --sw:290px;--r:14px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--fb);background:var(--paper);color:var(--ink);font-size:16px;line-height:1.7;
  background-image:
    radial-gradient(ellipse 700px 300px at 100% -50px,rgba(216,30,122,.08) 0,transparent 60%),
    radial-gradient(ellipse 500px 300px at -100px 600px,rgba(0,135,81,.07) 0,transparent 60%),
    radial-gradient(ellipse 400px 300px at 50% 110%,rgba(255,194,51,.08) 0,transparent 60%)}

/* bandeau wax Ankara coloré */
body::before{
  content:'';position:fixed;top:0;left:0;right:0;height:10px;z-index:10;
  background:linear-gradient(90deg,var(--ng-green) 0 33.3%,#fff 33.3% 66.6%,var(--ng-green) 66.6%)}
body::after{
  content:'';position:fixed;top:10px;left:0;right:0;height:8px;z-index:10;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 60 8'><g><rect width='60' height='8' fill='%23ffc233'/><circle cx='8' cy='4' r='2.5' fill='%23d81e7a'/><circle cx='24' cy='4' r='2.5' fill='%2300bcd4'/><circle cx='40' cy='4' r='2.5' fill='%23008751'/><circle cx='56' cy='4' r='2.5' fill='%23ff6b35'/></g></svg>");
  background-size:60px 8px;background-repeat:repeat-x}

.progress-bar{position:fixed;top:18px;left:0;height:3px;width:0;z-index:200;
  background:linear-gradient(90deg,var(--magenta),var(--cyan))}

.page-layout{display:flex;min-height:100vh;padding-top:18px}
.sidebar{width:var(--sw);flex-shrink:0;background:var(--paper);border-right:1px solid var(--line);
  position:sticky;top:18px;height:calc(100vh - 18px);overflow-y:auto;display:flex;flex-direction:column}
.sidebar-header{padding:34px 24px 28px;position:relative;
  background:linear-gradient(135deg,var(--ink) 0%,#1d242d 100%);color:#fff;
  border-bottom:5px solid var(--ng-green)}
.sidebar-header::before{content:'';position:absolute;top:0;right:0;width:60px;height:60px;
  background:radial-gradient(circle at center,var(--magenta) 0,transparent 70%);opacity:.7}
.sidebar-back{display:block;font-family:var(--fm);font-size:.64rem;letter-spacing:.2em;
  text-decoration:none;color:var(--yellow);margin-bottom:14px;text-transform:uppercase;position:relative;z-index:1}
.sidebar-back:hover{color:var(--cyan)}
.sidebar-title{font-family:var(--fd);font-size:2.4rem;line-height:1;color:#fff;font-weight:800;
  letter-spacing:-.02em;position:relative;z-index:1;font-style:italic}
.sidebar-naija{display:inline-block;background:var(--ng-green);color:#fff;padding:3px 10px;
  border-radius:20px;font-family:var(--fm);font-size:.58rem;letter-spacing:.2em;
  margin-top:10px;font-weight:600;position:relative;z-index:1}
.toc-nav{padding:16px 0;flex:1}
.toc-section-label{font-family:var(--fm);font-size:.62rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--muted);padding:14px 24px 8px;font-weight:600}
.toc-link{display:block;padding:7px 24px;color:var(--ink);text-decoration:none;
  font-size:.9rem;border-left:3px solid transparent;transition:all .18s}
.toc-link:hover,.toc-link.active{background:rgba(0,135,81,.08);border-left-color:var(--ng-green);
  color:var(--ng-green-d);font-weight:600}
.sidebar-nav{padding:18px 24px 24px;border-top:1px solid var(--line);background:var(--paper-2)}
.sidebar-nav p{font-family:var(--fm);font-size:.62rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--muted);margin:10px 0 8px;font-weight:700}
.sidebar-nav a{display:block;text-decoration:none;color:var(--ink);padding:3px 0;font-size:.88rem}
.sidebar-nav a:hover{color:var(--magenta)}
.sidebar-nav a.current{color:var(--ng-green-d);font-weight:800}

.main{flex:1;min-width:0;max-width:920px;padding:0 60px 100px}
.page-header{padding:60px 0 44px;margin-bottom:40px;position:relative}
.page-header::after{content:'';position:absolute;bottom:0;left:0;width:240px;height:6px;
  background:linear-gradient(90deg,var(--magenta) 0 33%,var(--cyan) 33% 66%,var(--yellow) 66%);
  border-radius:3px}
.subject-tag{font-family:var(--fm);font-size:.66rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--magenta);margin-bottom:14px;font-weight:700}
.page-title{font-family:var(--fd);font-size:5rem;line-height:1;color:var(--ink);font-weight:800;
  letter-spacing:-.03em;font-style:italic}
.page-title .sub{display:block;font-size:1rem;font-family:var(--fb);letter-spacing:.04em;
  color:var(--ng-green-d);margin-top:14px;font-weight:500;font-style:normal;text-transform:uppercase}
.page-intro{margin-top:22px;max-width:680px;color:var(--muted);font-size:1.06rem;line-height:1.72}

.section{margin-bottom:64px;scroll-margin-top:32px}
.section-title{display:flex;align-items:baseline;gap:16px;font-family:var(--fd);font-size:2.5rem;
  padding-bottom:12px;margin-bottom:26px;color:var(--ink);
  border-bottom:3px solid var(--ink);font-style:italic;font-weight:800}
.section-title .num{font-family:var(--fm);font-size:.68rem;color:#fff;font-weight:700;
  background:var(--magenta);padding:6px 13px;letter-spacing:.14em;border-radius:20px;font-style:normal}

.box{margin:16px 0;padding:22px 24px 20px;background:#fff;border:1px solid var(--line);border-radius:var(--r);
  box-shadow:0 3px 14px rgba(13,16,20,.05)}
.box-label{display:block;font-family:var(--fm);font-size:.62rem;letter-spacing:.18em;
  text-transform:uppercase;margin-bottom:10px;font-weight:700}
.box.def{background:#fff;border-left:5px solid var(--ng-green)}
.box.def .box-label{color:var(--ng-green-d)}
.box.histoire{background:#fff4e4;border-left:5px solid var(--yellow);border-radius:var(--r)}
.box.histoire .box-label{color:#a86b05}
.box.technique{background:#e0f6fa;border-left:5px solid var(--cyan);border-radius:var(--r)}
.box.technique .box-label{color:#00707a}
.box.attention{background:#fde4ef;border-left:5px solid var(--magenta);border-radius:var(--r)}
.box.attention .box-label{color:var(--magenta-d)}
.box.remark{background:transparent;border:none;border-left:3px solid var(--orange);padding-left:22px;border-radius:0}
.box.remark .box-label{color:var(--orange)}
.box.chiffres{background:linear-gradient(135deg,var(--ink) 0%,#1d242d 100%);color:#fff;
  border:none;border-top:5px solid var(--ng-green);box-shadow:0 10px 30px rgba(13,16,20,.25)}
.box.chiffres .box-label{color:var(--yellow)}
.box.chiffres p,.box.chiffres li{color:rgba(255,255,255,.92)}
.box p:last-child,.box ul:last-child{margin-bottom:0}
p{margin-bottom:.95em}ul{padding-left:1.4em;margin-bottom:.95em}li{margin-bottom:.3em}
strong{color:var(--magenta-d);font-weight:700}

.data-table{width:100%;border-collapse:collapse;margin:14px 0;font-size:.88rem;background:#fff;
  border-radius:10px;overflow:hidden}
.data-table th{background:var(--ink);color:var(--yellow);padding:12px 14px;text-align:left;
  font-family:var(--fm);font-size:.66rem;letter-spacing:.12em;text-transform:uppercase;font-weight:700}
.data-table td{padding:11px 14px;border-bottom:1px solid var(--line);vertical-align:top}
.data-table tr:last-child td{border-bottom:none}
.data-table tr:nth-child(even) td{background:rgba(216,30,122,.03)}
.data-table td:first-child{font-weight:700;color:var(--ng-green-d)}
.box.chiffres .data-table{background:rgba(255,255,255,.05);border-radius:6px}
.box.chiffres .data-table th{background:rgba(255,194,51,.15);color:var(--yellow)}
.box.chiffres .data-table td{border-color:rgba(255,255,255,.12);color:rgba(255,255,255,.94)}
.box.chiffres .data-table td:first-child{color:var(--ng-green-l)}
.box.chiffres .data-table tr:nth-child(even) td{background:rgba(255,255,255,.04)}

.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:18px;z-index:50;background:var(--ink);color:#fff;
  padding:12px 18px;align-items:center;justify-content:space-between;border-bottom:4px solid var(--ng-green)}
.mobile-menu-btn{background:none;border:none;color:var(--yellow);font-size:1.3rem;cursor:pointer}
.mobile-title{font-family:var(--fd);font-size:1.2rem;color:#fff;font-style:italic;font-weight:800}
.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:280px;background:var(--paper);height:100%;
  overflow-y:auto;padding:14px 0;border-right:4px solid var(--magenta)}
@media(max-width:960px){
  .sidebar{display:none}.mobile-header{display:flex}.main{padding:0 20px 72px}
  .page-title{font-size:2.8rem}.two-col{grid-template-columns:1fr}
}