/* Layout: colonna singola stretta (mobile-first), una cosa per schermata.
   Nessuna risorsa esterna: font di sistema, così il quiz non dipende da CDN. */
:root {
  --bg: #f3f5f8;
  --card: #ffffff;
  --ink: #14202e;
  --muted: #5b6a7b;
  --line: #d9e0e8;
  --accent: #1f5eff;
  --ok: #0f8a4f;
  --ok-bg: #e3f6ec;
  --bad: #c62f2f;
  --bad-bg: #fbe7e7;
  --c-chatbot: #1f5eff;
  --c-agente: #0f8a4f;
  --c-agentic: #8a3ffc;
  --c-nonso: #7b8794;
  --c-vero: var(--c-chatbot);
  --c-falso: var(--c-agentic);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e141b;
    --card: #17202a;
    --ink: #e8edf3;
    --muted: #9aa8b8;
    --line: #2a3745;
    --accent: #6c93ff;
    --ok: #3ccf86;
    --ok-bg: #12301f;
    --bad: #ff7a7a;
    --bad-bg: #3a1a1a;
    --c-chatbot: #6c93ff;
    --c-agente: #3ccf86;
    --c-agentic: #b48cff;
    --c-nonso: #8fa0b3;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  padding: 16px;
  min-height: 100vh;
}
main { max-width: 640px; margin: 0 auto; display: grid; gap: 16px; }
main.wide { max-width: 980px; }
h1 { font-size: 1.7rem; line-height: 1.2; margin: 0; text-wrap: balance; }
h2 { font-size: 1.15rem; margin: 0; }
p { margin: 0; }
.muted { color: var(--muted); }
.small { font-size: .9rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px; display: grid; gap: 14px; }
.eyebrow { font-size: .8rem; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }

button, select, input, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.btn {
  background: var(--accent); color: #fff; border: 0; border-radius: 10px;
  padding: 14px 18px; font-weight: 600; min-height: 48px;
}
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn.danger { background: var(--bad); }
.btn:disabled { opacity: .5; cursor: default; }

/* --- quiz --- */
.progress { height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; }
.progress > div { height: 100%; background: var(--accent); transition: width .25s; }
.opts { display: grid; gap: 10px; }
.opt {
  display: flex; align-items: center; gap: 12px; text-align: left; width: 100%;
  background: var(--card); border: 2px solid var(--line); border-radius: 12px;
  padding: 14px; min-height: 56px; font-weight: 600;
}
.opt .dot { width: 14px; height: 14px; border-radius: 50%; flex: none; background: var(--c); }
.opt[data-c=chatbot] { --c: var(--c-chatbot); }
.opt[data-c=agente] { --c: var(--c-agente); }
.opt[data-c=agentic] { --c: var(--c-agentic); }
.opt[data-c=nonso] { --c: var(--c-nonso); font-weight: 500; }
.opt[data-c=vero] { --c: var(--c-vero); }
.opt[data-c=falso] { --c: var(--c-falso); }
.opt:not(:disabled):hover { border-color: var(--c); }
.opt:disabled { cursor: default; }
.opt.right { border-color: var(--ok); background: var(--ok-bg); }
.opt.wrong { border-color: var(--bad); background: var(--bad-bg); }
.opt.faded { opacity: .55; }
.feedback { border-radius: 12px; padding: 14px; display: grid; gap: 4px; }
.feedback.ok { background: var(--ok-bg); }
.feedback.ko { background: var(--bad-bg); }
.feedback strong { font-size: 1.05rem; }
.score { font-size: 3rem; font-weight: 800; line-height: 1; font-variant-numeric: tabular-nums; }
.review { display: grid; gap: 10px; }
.review > div { border-left: 4px solid var(--bad); padding-left: 12px; }
.err { color: var(--bad); }

/* --- admin --- */
.tabs { display: flex; gap: 8px; flex-wrap: wrap; }
.tabs button { background: transparent; border: 1px solid var(--line); border-radius: 999px; padding: 8px 16px; }
.tabs .badge { opacity: .75; font-variant-numeric: tabular-nums; }
.tabs button[aria-selected=true] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }
.kpi { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px; }
.kpi b { display: block; font-size: 2.2rem; line-height: 1.1; font-variant-numeric: tabular-nums; }
.stack { display: flex; height: 22px; border-radius: 6px; overflow: hidden; background: var(--line); }
.stack > span { height: 100%; min-width: 0; }
.stack [data-c=chatbot] { background: var(--c-chatbot); }
.stack [data-c=agente] { background: var(--c-agente); }
.stack [data-c=agentic] { background: var(--c-agentic); }
.stack [data-c=nonso] { background: var(--c-nonso); }
.stack [data-c=vero] { background: var(--c-vero); }
.stack [data-c=falso] { background: var(--c-falso); }
.legend { display: flex; gap: 14px; flex-wrap: wrap; font-size: .9rem; }
.legend i { display: inline-block; width: 12px; height: 12px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; }
.qrow { display: grid; gap: 8px; padding: 14px 0; border-top: 1px solid var(--line); }
.qrow:first-child { border-top: 0; }
.qhead { display: flex; gap: 12px; justify-content: space-between; align-items: baseline; }
.qhead .pct { font-weight: 800; font-size: 1.3rem; font-variant-numeric: tabular-nums; white-space: nowrap; }
.pct.low { color: var(--bad); } .pct.mid { color: #b7791f; } .pct.high { color: var(--ok); }
.qhead p { min-width: 0; }
.nums { display: flex; gap: 14px; flex-wrap: wrap; font-size: .85rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.field { display: grid; gap: 6px; }
.field label { font-size: .85rem; color: var(--muted); }
.field textarea, .field select, .field input[type=number], .field input[type=password] {
  background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 10px; width: 100%;
}
.field textarea { min-height: 84px; resize: vertical; }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: end; }
.row > * { min-width: 0; }
.row .field { flex: 1 1 140px; }
.qr-box { text-align: center; }
.qr-box img, .qr-box canvas { max-width: 100%; height: auto; }
@media (prefers-reduced-motion: reduce) { .progress > div { transition: none; } }