/* ===== Reset & Tokens ===== */
* { box-sizing: border-box; margin: 0; padding: 0; }
:root{
  --bg:#0f172a; --panel:#111827; --text:#e5e7eb; --text-strong:#fff;
  --border:#1f2937; --accent:#60a5fa; --muted:#9ca3af; --radius:.6rem;
  --ring: 0 0 0 3px rgba(96,165,250,.25);
}

/* ===== Base ===== */
body{
  font-family: system-ui,-apple-system,"Segoe UI",Roboto,Arial;
  line-height:1.5; background:var(--bg); color:var(--text);
}
.container{ width:min(92vw,70rem); margin:0 auto; padding:1rem; }
.section{ padding:1.5rem 0; border-top:1px solid var(--border); }
.section h2{ color:var(--text-strong); margin-bottom:.6rem; }
.section h3{ margin-top:1rem; color:var(--text-strong); font-size:1.1rem; }

/* ===== Header ===== */
.header{ background:var(--panel); border-bottom:1px solid var(--border); position:sticky; top:0; z-index:10; }
.header-row{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:.75rem; }
.brand{ display:flex; align-items:center; gap:.5rem; font-weight:700; color:var(--text-strong); text-decoration:none; }
.brand-logo{ width:38px; height:38px; border-radius:50%; }

/* ===== Navigazione ===== */
.nav{ display:flex; gap:.5rem; flex-wrap:wrap; }
.nav a{
  text-decoration:none; color:var(--text);
  padding:.4rem .7rem; border:1px solid var(--border);
  border-radius:var(--radius); background:var(--panel);
  transition:border-color .2s ease, color .2s ease;
}
.nav a:hover{ border-color:var(--accent); color:var(--accent); }
.nav a[aria-current="page"]{ border-color:var(--accent); color:var(--accent); }
.nav a:focus-visible{ outline:none; box-shadow:var(--ring); border-color:var(--accent); }

/* ===== Hero ===== */
.hero{ text-align:center; padding-block:2rem; border-bottom:1px solid var(--border); }
.hero-logo{ width:120px; height:120px; border-radius:50%; margin-inline:auto; box-shadow:0 2px 10px rgba(0,0,0,.4); }
.hero h1{ color:var(--text-strong); margin-top:.8rem; }
.subtitle{ color:var(--muted); margin:.3rem 0 1rem; }
.btn{
  display:inline-block; background:var(--accent); color:#000; text-decoration:none;
  padding:.55rem 1rem; border-radius:var(--radius); font-weight:600;
  border:1px solid var(--border);
  transition:border-color .2s ease, box-shadow .2s ease, transform .02s ease;
  line-height:1;
}
.btn:hover{ border-color:var(--accent); box-shadow:0 0 0 2px rgba(96,165,250,.15); }
.btn:focus-visible{ outline:none; box-shadow:var(--ring); border-color:var(--accent); }
.btn:active{ transform: translateY(1px); }

/* ===== Section collapsible ===== */
.section-details { display:block; }
.section-summary{
  cursor:pointer; list-style:none;
  display:flex; align-items:center;
  user-select:none;
}
.section-summary::-webkit-details-marker{ display:none; }
.section-summary h2{ margin-bottom:0; flex:1; transition:color .2s ease; }
.section-summary::after{
  content:"▸"; font-size:1.3rem; margin-left:.5rem;
  color:var(--muted); transition:transform .15s ease, color .2s ease;
}
.section-summary:hover h2,
.section-summary:hover::after{ color:var(--accent); }
.section-details[open] > .section-summary::after{ transform:rotate(90deg); }
.section-details[open] > .section-summary h2{ margin-bottom:.6rem; }

/* ===== Accordion ===== */
.accordion{
  margin:.6rem 0 1rem;
  border:1px solid var(--border);
  border-radius:var(--radius);
  background:var(--panel);
  overflow:hidden;
}
.accordion > summary{
  cursor:pointer; list-style:none; padding:.65rem .8rem; color:var(--text-strong);
  user-select:none; display:flex; align-items:center; gap:.5rem;
}
.accordion > summary::-webkit-details-marker{ display:none; }
.accordion > summary::after{
  content:"▸"; margin-left:auto; font-size:1.3rem; transition: transform .15s ease;
}
.accordion[open] > summary::after{ transform: rotate(90deg); }
.accordion[open]{ border-color:var(--accent); }

.accordion .nested{
  margin:.5rem; border:1px solid var(--border); border-radius:var(--radius); background:transparent;
}
.accordion .nested > summary{
  padding:.55rem .7rem; color:var(--text); font-weight:600;
}
.accordion .nested[open]{ border-color:var(--accent); }

/* ===== Liste file ===== */
.file-list{ list-style:none; margin:.4rem; padding:.2rem; }
.file-list li + li{ margin-top:.35rem; }

.file-list a{
  display:flex; align-items:center; gap:.5rem;
  color:var(--text-strong);
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius);
  text-decoration:none;
  padding:.55rem .8rem;
  font-weight:500;
  transition:all .2s ease;
}
.file-list a::before{ content:"📄"; opacity:.8; }
.file-list a[href$=".pdf"]::before{ content:"📕"; }
.file-list a[href$=".zip"]::before{ content:"📦"; }
.file-list a:hover,
.file-list a:focus-visible{
  border-color:var(--accent);
  color:var(--accent);
  box-shadow:0 0 0 2px rgba(96,165,250,.2);
}

/* ===== Team ===== */
.centered{text-align:center;}
.team{
  list-style:none; margin:1.2rem auto 0; padding:0; max-width:60rem;
  display:grid; gap:1rem; grid-template-columns:repeat(auto-fit, minmax(16rem,1fr));
}
.card{
  background:var(--panel); border:1px solid var(--border); border-radius:var(--radius);
  padding:1rem; text-align:center; box-shadow:0 2px 4px rgba(0,0,0,.25);
  transition:border-color .2s ease, box-shadow .2s ease;
}
.card:hover{ border-color:var(--accent); }
.card strong{ color:var(--text-strong); display:block; margin-bottom:.25rem; }
.muted{ color:var(--muted); }

.pill{
  display:inline-block; padding:.45rem .7rem; border:1px solid var(--border);
  border-radius:1rem; background:var(--panel); color:var(--text);
  text-decoration:none; transition:border-color .2s ease, color .2s ease, box-shadow .2s ease;
}
.pill:hover{ border-color:var(--accent); color:var(--accent); }
.pill:focus-visible{ outline:none; box-shadow:var(--ring); border-color:var(--accent); }

/* ===== Footer ===== */
.footer{
  background:var(--panel); border-top:1px solid var(--border);
  text-align:center; color:var(--muted); padding:.6rem 0;
}

/* ===== Accessibilità & Utility ===== */
a:focus-visible { outline:none; box-shadow:var(--ring); border-color:var(--accent); }
section[id]{ scroll-margin-top:80px; } /* evita overlap con header sticky */
html{ scroll-behavior:smooth; }

@media (prefers-reduced-motion: reduce){
  *{ transition:none !important; scroll-behavior:auto !important; }
}

/* ===== Skip link / visually hidden ===== */
.skip-link{
  position:absolute; left:-9999px; top:auto; width:1px; height:1px; overflow:hidden;
}
.skip-link:focus{
  left:1rem; top:1rem; width:auto; height:auto; z-index:1000;
  background:var(--accent); color:#000; padding:.5rem .75rem;
  border-radius:.4rem; box-shadow:var(--ring);
}
.visually-hidden{
  position:absolute !important; clip:rect(1px, 1px, 1px, 1px);
  padding:0 !important; border:0 !important; height:1px !important; width:1px !important;
  overflow:hidden; white-space:nowrap;
}