:root{
  --night:#050b14; --deep:#0b2d4a; --moss:#2f4a4f;
  --mint:#a8f0dc; --aqua:#8ee3f0; --sky:#5fb4e6; --ink:#e6f1f5; --mute:#8fa8b3;
  color-scheme: dark;
  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px);
  padding-bottom:env(safe-area-inset-bottom,0px);
}
*,*::before,*::after{box-sizing:inherit}
html{scroll-padding-top:env(safe-area-inset-top,0px)}
body{
  margin:0; min-height:100vh; color:var(--ink);
  font-family:"Sora",system-ui,-apple-system,"Segoe UI",sans-serif;
  background:
    radial-gradient(ellipse 50% 45% at 25% 30%, rgba(47,74,79,.75), transparent 70%),
    radial-gradient(ellipse 60% 40% at 50% 100%, rgba(11,45,74,.9), transparent 70%),
    var(--night);
  overflow-x:hidden;
}

/* Stelle */
.stars{position:fixed;inset:0;pointer-events:none;opacity:.55;
  background-image:
    radial-gradient(1px 1px at 20px 30px,#cfe8ee,transparent),
    radial-gradient(1px 1px at 110px 90px,#8ee3f0,transparent),
    radial-gradient(1px 1px at 60px 150px,#fff,transparent);
  background-size:170px 190px}

main{position:relative;max-width:1180px;margin:0 auto;padding:4vh 20px 0}

/* Scena con orbite */
.stage{position:relative;width:100%;aspect-ratio:1100/640;margin-top:2vh}
.rings{position:absolute;inset:0;width:100%;height:100%}

/* Centro */
.core{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);text-align:center;width:min(480px,44%)}
.tile{width:84px;height:84px;margin:0 auto 22px;border-radius:26px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--mint),var(--sky));
  box-shadow:0 0 0 14px rgba(142,227,240,.06),0 0 0 15px rgba(142,227,240,.22),0 10px 50px rgba(142,227,240,.35)}
.tile svg{width:38px;height:38px}
h1{margin:0;font-family:"Montserrat","Sora",system-ui,sans-serif;font-weight:800;text-rendering:geometricPrecision;font-synthesis:none;font-size:clamp(44px,7.4vw,92px);letter-spacing:.22em;margin-right:-.22em;line-height:1;
  color:#fff;text-shadow:0 0 34px rgba(142,227,240,.45)}
.tag{margin:22px auto 0;font-size:clamp(15px,1.6vw,20px);font-weight:600;color:var(--ink);line-height:1.4}
.sub{margin:10px auto 0;font-size:14px;color:var(--mute);max-width:36ch;line-height:1.6}

/* Link sulle orbite */
.node{position:absolute;transform:translate(-50%,-50%);width:236px;display:block;text-decoration:none;color:inherit;
  padding:16px 18px;border-radius:20px;
  background:linear-gradient(160deg,rgba(15,52,80,.72),rgba(8,24,40,.72));
  border:1px solid rgba(142,227,240,.22);backdrop-filter:blur(8px);
  transition:border-color .2s,box-shadow .2s,transform .2s}
.node:hover,.node:focus-visible{border-color:var(--aqua);box-shadow:0 0 36px rgba(142,227,240,.28);transform:translate(-50%,-52%);outline:none}
.node:focus-visible{outline:2px solid var(--mint);outline-offset:3px}
.node b{display:flex;align-items:center;justify-content:space-between;font-size:17px;font-weight:600;color:#fff}
.node span{display:block;margin-top:6px;font-size:13px;line-height:1.5;color:var(--mute)}
.node i{width:9px;height:9px;border-radius:50%;background:var(--mint);box-shadow:0 0 12px var(--mint);flex:none}
.n1{left:14%;top:27%}.n2{left:86%;top:27%}.n3{left:14%;top:73%}.n4{left:86%;top:73%}
.n2 i{background:var(--aqua)}
.n3 i{background:var(--sky);box-shadow:0 0 12px var(--sky)}
.n4 i{background:#fff;box-shadow:0 0 12px #fff}

footer{text-align:center;padding:28px 0 36px;font-size:13px;color:var(--mute)}
footer a{color:var(--aqua);text-decoration:none}

/* Mobile */
@media (max-width:860px){
  .stage{aspect-ratio:auto;display:flex;flex-direction:column;gap:12px;margin-top:4vh}
  .rings{display:none}
  .core{position:static;transform:none;width:100%;margin-bottom:22px}
  .node{position:static;transform:none;width:100%}
  .node:hover,.node:focus-visible{transform:none}
  h1{font-size:clamp(40px,14vw,64px)}
}

/* Accessibilità: niente movimento se richiesto */
@media (prefers-reduced-motion:reduce){
  .node{transition:none}
  #sat{display:none}
}