:root{
  --navy:#16324f;--navy2:#21486f;--amber:#c8892b;--amber-l:#fbf1e2;
  --bg:#f4f5f7;--card:#fff;--ink:#1d2430;--muted:#5b6675;--line:#e1e4ea;
  --ok:#1f7a4d;--ok-l:#e5f4ec;--err:#b3261e;--err-l:#fbe9e7;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,monospace;
}
*{box-sizing:border-box}
body{margin:0;font-family:"IBM Plex Sans",system-ui,-apple-system,Segoe UI,sans-serif;background:var(--bg);color:var(--ink);font-size:15px;line-height:1.55}
a{color:var(--navy2)}
h1,h2,h3{color:var(--navy);line-height:1.25}
h1{font-size:1.7rem;margin:.2rem 0 1rem}
h2{font-size:1.25rem;margin:1.8rem 0 .6rem}
h3{font-size:1.05rem;margin:1.2rem 0 .4rem}
code,pre{font-family:var(--mono);font-size:.88em}
.layout{display:flex;min-height:100vh}
.side{width:250px;background:var(--navy);color:#cfd8e3;padding:18px 14px;flex-shrink:0;position:sticky;top:0;height:100vh;overflow:auto}
.side .brand{color:#fff;font-weight:700;font-size:1.05rem;letter-spacing:.3px;margin-bottom:2px}
.side .brand small{display:block;color:var(--amber);font-weight:500;font-size:.75rem;letter-spacing:1.5px;text-transform:uppercase}
.side h4{color:#8fa3b8;font-size:.7rem;letter-spacing:1.4px;text-transform:uppercase;margin:18px 6px 6px}
.side a{display:flex;align-items:center;gap:8px;color:#dfe6ee;text-decoration:none;padding:6px 8px;border-radius:6px;font-size:.88rem}
.side a:hover,.side a.on{background:rgba(255,255,255,.1);color:#fff}
.side .dot{width:8px;height:8px;border-radius:50%;background:#4c6580;flex-shrink:0}
.side .dot.ok{background:#5cc98c}
.main{flex:1;padding:26px 34px 60px;max-width:1180px;min-width:0}
.top{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;gap:12px;flex-wrap:wrap}
.top .who{color:var(--muted);font-size:.85rem}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:18px 20px;margin-bottom:18px}
.grid{display:grid;gap:14px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}.g3{grid-template-columns:repeat(3,minmax(0,1fr))}.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
.kpi{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px 14px}
.kpi .l{color:var(--muted);font-size:.75rem;text-transform:uppercase;letter-spacing:.8px}
.kpi .v{font-size:1.45rem;font-weight:600;color:var(--navy);font-variant-numeric:tabular-nums}
.kpi .s{font-size:.78rem;color:var(--muted)}
table.tab,table.t{border-collapse:collapse;width:100%;font-size:.88rem;margin:.6rem 0}
.tab th,.tab td,.t th,.t td{border-bottom:1px solid var(--line);padding:6px 8px;text-align:left;vertical-align:top}
.tab th,.t th{background:#eef1f5;color:var(--navy);font-weight:600;font-size:.8rem}
.t td.n,.t th.n{text-align:right;font-variant-numeric:tabular-nums}
.scroll{overflow-x:auto}
.formula{background:var(--amber-l);border-left:4px solid var(--amber);padding:10px 14px;margin:10px 0;font-family:var(--mono);font-size:.92rem;border-radius:4px}
.box{background:#eef4fa;border-left:4px solid var(--navy2);padding:10px 14px;margin:14px 0;border-radius:4px;font-size:.93rem}
pre.code,pre.er{background:#0f2236;color:#e4ecf5;padding:12px 14px;border-radius:8px;overflow:auto;line-height:1.45}
.btn{display:inline-block;background:var(--navy);color:#fff;border:0;border-radius:7px;padding:8px 15px;font-size:.9rem;cursor:pointer;text-decoration:none;font-family:inherit}
.btn:hover{background:var(--navy2)}
.btn.amber{background:var(--amber)}.btn.ghost{background:transparent;color:var(--navy);border:1px solid var(--line)}
.btn.sm{padding:4px 10px;font-size:.8rem}
.btn.red{background:var(--err)}
input,select,textarea{font-family:inherit;font-size:.92rem;padding:7px 9px;border:1px solid #c9ced8;border-radius:6px;background:#fff;color:var(--ink)}
textarea{width:100%;font-family:var(--mono);min-height:150px}
label{font-size:.85rem;color:var(--muted);display:block;margin-bottom:3px}
.field{margin-bottom:12px}
.flash{padding:10px 14px;border-radius:8px;margin-bottom:14px;font-size:.92rem}
.flash.ok{background:var(--ok-l);color:var(--ok);border:1px solid #b9e0c9}
.flash.err{background:var(--err-l);color:var(--err);border:1px solid #f1c3be}
.tabs{display:flex;gap:4px;border-bottom:2px solid var(--line);margin-bottom:18px;flex-wrap:wrap}
.tabs a{padding:8px 16px;text-decoration:none;color:var(--muted);border-bottom:3px solid transparent;margin-bottom:-2px;font-weight:500}
.tabs a.on{color:var(--navy);border-color:var(--amber)}
.badge{display:inline-block;font-size:.72rem;padding:2px 8px;border-radius:20px;background:#eef1f5;color:var(--muted);font-weight:600}
.badge.ok{background:var(--ok-l);color:var(--ok)}.badge.err{background:var(--err-l);color:var(--err)}.badge.am{background:var(--amber-l);color:#8a5a12}
.lesson{max-width:820px}
.lesson p,.lesson li{font-size:1rem}
.q{border:1px solid var(--line);border-radius:8px;padding:12px 14px;margin-bottom:12px;background:#fff}
.q .opt{display:flex;gap:8px;align-items:flex-start;color:var(--ink);font-size:.95rem;margin:5px 0;cursor:pointer}
.q.okq{border-color:#9bd3b3}.q.koq{border-color:#efb1aa}
.muted{color:var(--muted)}.small{font-size:.83rem}
.row{display:flex;gap:10px;align-items:flex-end;flex-wrap:wrap}
.bar{height:8px;background:#e6e9ee;border-radius:5px;overflow:hidden}
.bar span{display:block;height:100%;background:var(--amber)}
.warn{color:var(--err);font-weight:600}
.hero{background:linear-gradient(135deg,var(--navy),#0d2033);color:#fff;padding:60px 24px}
.hero h1{color:#fff;font-size:2.3rem;max-width:800px}
.hero p{color:#cfd8e3;max-width:720px;font-size:1.1rem}
.wrap{max-width:1080px;margin:0 auto}
.hash{font-family:var(--mono);font-size:.74rem;word-break:break-all;color:var(--muted)}
@media (max-width:860px){
  .layout{flex-direction:column}.side{width:100%;height:auto;position:static}
  .main{padding:18px 16px 50px}.g2,.g3,.g4{grid-template-columns:1fr 1fr}
}
@media (max-width:520px){.g2,.g3,.g4{grid-template-columns:1fr}.hero h1{font-size:1.7rem}}
@media print{.side,.top,.btn{display:none}}

/* menu laterale richiudibile su telefono, tabelle scorrevoli dentro le schede */
.sidemenu>summary{display:none;list-style:none;cursor:pointer;color:#fff;font-weight:600;padding:8px 6px;border:1px solid rgba(255,255,255,.25);border-radius:6px;margin-top:10px}
.sidemenu>summary::-webkit-details-marker{display:none}
.card,.lesson{overflow-x:auto}
pre{max-width:100%;overflow:auto}
@media (max-width:860px){.sidemenu>summary{display:block}.side{padding:12px 14px}}
.ripasso{border:1px solid #d9e2ec;border-radius:6px;padding:8px 12px;margin:8px 0;background:#fff}
.ripasso summary{cursor:pointer;font-weight:600}
.ripasso p{margin:8px 0 2px}

/* quiz: fieldset accessibile con l'aspetto delle schede domanda */
fieldset.q{margin:0 0 12px;min-width:0}
fieldset.q legend{padding:0;float:left;width:100%;margin-bottom:4px}
fieldset.q legend+*{clear:left}
.foot{margin-top:40px;padding:16px 0;border-top:1px solid var(--line);font-size:.8rem;color:var(--muted)}
.foot a{color:var(--muted);margin-right:12px}
.side .foot{border-color:rgba(255,255,255,.15);color:#8fa3b8;margin-top:20px}
.side .foot a{display:inline;padding:0;color:#8fa3b8}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--amber);outline-offset:2px}

/* fase 5: accessibilità */
.sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.salta{position:absolute;left:-9999px;top:8px;background:var(--amber);color:#fff;padding:8px 14px;border-radius:6px;z-index:10}
.salta:focus{left:8px}
textarea:focus-visible{outline:3px solid var(--amber);outline-offset:2px}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
/* contrasto WCAG AA: testo bianco sul pulsante ambra e ambra sul blu del menu */
.btn.amber{background:#9c6514}.btn.amber:hover{background:#87570f}
.side .brand small{color:#e0a54a}
@media (max-width:520px){.mob2{grid-template-columns:1fr 1fr}.mob2 .kpi .v{font-size:1.2rem}.mob2 .kpi .l{font-size:.68rem;letter-spacing:.4px}}

/* esercitazione guidata: finestrella a destra */
.guida{position:fixed;top:12px;right:12px;bottom:12px;width:340px;background:#fff;border:1px solid var(--line);border-top:5px solid var(--amber);
  border-radius:10px;box-shadow:0 8px 28px rgba(22,50,79,.18);padding:12px 14px;overflow:auto;z-index:20;font-size:.9rem}
.guida.ridotta{top:auto;bottom:16px;width:auto;padding:0;border:0;box-shadow:none;background:transparent;overflow:visible}
.guida .linguetta{background:var(--navy);color:#fff;border:0;border-radius:20px;padding:10px 16px;font:inherit;font-weight:600;cursor:pointer;box-shadow:0 6px 18px rgba(22,50,79,.3)}
.guida-testa{display:flex;justify-content:space-between;align-items:flex-start;gap:8px;color:var(--navy)}
.guida-testa .small{color:var(--muted);letter-spacing:.6px}
.guida .x{background:transparent;border:1px solid var(--line);border-radius:6px;width:30px;height:30px;font-size:1.1rem;cursor:pointer;color:var(--navy)}
.guida h2{font-size:1.08rem;margin:.7rem 0 .4rem}
.guida .bar{margin-top:8px}
.guida-fare{padding-left:20px;margin:.4rem 0}.guida-fare li{margin-bottom:6px}
.guida code.sql{display:block;background:#0f2236;color:#e4ecf5;padding:8px;border-radius:6px;white-space:pre-wrap;word-break:break-word;font-size:.74rem;user-select:all}
.guida .annota{background:var(--amber-l);border-radius:6px;padding:8px 10px;margin:8px 0;font-size:.85rem}.guida .annota ul{margin:.3rem 0 0;padding-left:18px}
.guida details{margin:6px 0}.guida summary{cursor:pointer;color:var(--navy2);font-weight:600;font-size:.85rem}
.guida .qui{color:var(--ok);font-weight:600}
.guida-bottoni{justify-content:space-between;margin:8px 0}
.guida-piede{margin:6px 0 8px;color:var(--muted)}
@media (min-width:1101px){body.con-guida .main{padding-right:380px}}
@media (max-width:1100px){
  .guida:not(.ridotta){top:auto;left:8px;right:8px;width:auto;max-height:62vh;bottom:8px}
  body.con-guida .main{padding-bottom:64vh}
  body.con-guida-ridotta .main{padding-bottom:80px}
}
@media print{.guida{display:none}}