/* ═══════════════════════════════════════════════════════════════
   READING NAV — barra flottante "indice" + torna in cima.
   Foglio di stile autonomo: non dipende dalle variabili di style.css,
   cosi' funziona identico anche sulle pagine con palette propria
   (lombardia.html, aforismi-poesie.html, cybersecurity.html, onto.html).
   ═══════════════════════════════════════════════════════════════ */

@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

.rn-controls{
  position:fixed;right:1.1rem;bottom:1.1rem;z-index:400;
  display:flex;flex-direction:column;align-items:flex-end;gap:.6rem;
  font-family:'Space Grotesk',system-ui,sans-serif;
}

.rn-btn{
  display:flex;align-items:center;justify-content:center;
  width:46px;height:46px;border-radius:50%;
  background:rgba(18,18,26,.88);backdrop-filter:blur(10px);
  border:1px solid rgba(255,255,255,.12);color:#e7e7f0;
  cursor:pointer;font-size:18px;line-height:1;
  box-shadow:0 6px 20px rgba(0,0,0,.35);
  opacity:0;transform:translateY(8px);pointer-events:none;
  transition:opacity .25s,transform .25s,border-color .2s,background .2s;
}
.rn-btn.rn-visible{opacity:1;transform:translateY(0);pointer-events:auto}
.rn-btn:hover{border-color:rgba(0,240,255,.4);background:rgba(24,24,34,.92)}
.rn-btn:focus-visible{outline:2px solid rgba(0,240,255,.6);outline-offset:2px}
.rn-btn-toc{font-size:15px;letter-spacing:.5px}

.rn-panel{
  position:fixed;top:0;right:0;bottom:0;width:min(340px,86vw);z-index:401;
  background:rgba(10,10,15,.97);backdrop-filter:blur(14px);
  border-left:1px solid rgba(255,255,255,.08);
  transform:translateX(100%);transition:transform .32s cubic-bezier(.19,1,.22,1);
  display:flex;flex-direction:column;
}
.rn-panel.rn-open{transform:translateX(0)}
.rn-panel-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:1.1rem 1.2rem;border-bottom:1px solid rgba(255,255,255,.08);flex-shrink:0;
}
.rn-panel-title{
  font-family:'JetBrains Mono',monospace;font-size:10.5px;letter-spacing:2px;text-transform:uppercase;
  color:#8f8fa8;
}
.rn-panel-close{
  background:none;border:none;color:#b5b5c8;font-size:20px;cursor:pointer;
  width:32px;height:32px;border-radius:6px;display:flex;align-items:center;justify-content:center;
  transition:background .2s,color .2s;
}
.rn-panel-close:hover{background:rgba(255,255,255,.06);color:#fff}
.rn-panel-body{overflow-y:auto;padding:.6rem 0 1.5rem;scrollbar-width:thin;scrollbar-color:rgba(255,255,255,.18) transparent}
.rn-panel-body::-webkit-scrollbar{width:6px}
.rn-panel-body::-webkit-scrollbar-thumb{background:rgba(255,255,255,.16);border-radius:3px}

.rn-list{list-style:none;margin:0;padding:0}
.rn-list a{
  display:block;padding:.55rem 1.2rem;color:#c4c4d6;text-decoration:none;font-size:13px;line-height:1.5;
  border-left:2px solid transparent;transition:color .15s,border-color .15s,background .15s;
}
.rn-list a:hover{color:#fff;background:rgba(255,255,255,.03)}
.rn-list a.rn-active{color:#00f0ff;border-left-color:#00f0ff;background:rgba(0,240,255,.05)}
.rn-list li.rn-lvl2 a{padding-left:1.2rem;font-weight:600}
.rn-list li.rn-lvl3 a{padding-left:2.1rem;font-size:12.5px;opacity:.92}
.rn-list li.rn-lvl4 a{padding-left:3rem;font-size:12px;opacity:.75}

.rn-overlay{
  position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:399;
  opacity:0;pointer-events:none;transition:opacity .3s;
}
.rn-overlay.rn-open{opacity:1;pointer-events:auto}

@media(max-width:600px){
  .rn-controls{right:.8rem;bottom:.8rem}
  .rn-btn{width:42px;height:42px}
  .rn-panel{width:100%}
}

@media(prefers-reduced-motion:reduce){
  .rn-panel,.rn-btn,.rn-overlay{transition:none}
}