/* ==========================================================================
   Logica › Problemi (js/logica/problemi.js): giochi matematici e gara a tempo.
   ========================================================================== */
.pb-wrap { max-width: 760px; }
.pb-catdesc { font-size: 13.5px; color: var(--ink-3); }

/* progresso e numeri dei problemi */
.pb-prog { display: flex; align-items: center; gap: 12px; margin: 2px 0 10px; }
.pb-progbar { flex: 1; height: 8px; border-radius: 99px; background: var(--fill-2); overflow: hidden; }
.pb-progbar i { display: block; height: 100%; width: 0; border-radius: inherit; background: var(--ok); transition: width 0.4s; }
.pb-progtx { font-size: 13.5px; color: var(--ink-2); white-space: nowrap; }
.pb-chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 14px; }
.pb-chip {
  min-width: 34px; height: 34px; padding: 0 6px; border-radius: 10px; border: 1px solid var(--stroke);
  background: var(--fill); color: var(--ink-2); font: inherit; font-size: 14px; font-weight: 600; cursor: pointer;
}
.pb-chip:hover { background: var(--fill-2); }
.pb-chip.ok { background: var(--ok-fill); color: var(--ok); border-color: transparent; }
.pb-chip.cur { box-shadow: 0 0 0 2px #5e9cff; border-color: transparent; }

/* scheda del problema */
.pb-card, .pb-item {
  padding: 18px 20px; border-radius: 18px;
  background: var(--glass-2, var(--fill)); box-shadow: inset 0 0 0 0.5px var(--glass-edge, var(--stroke));
}
.pb-head { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 10px; margin-bottom: 8px; }
.pb-head h2 { margin: 0; font-size: 18px; line-height: 1.3; color: var(--ink); }
.pb-tag {
  padding: 3px 9px; border-radius: 99px; font-size: 12.5px; font-weight: 700; letter-spacing: 0.02em;
  background: color-mix(in srgb, #5e9cff 16%, transparent); color: #5e9cff; white-space: nowrap;
}
.pb-done { margin-left: auto; font-size: 13px; font-weight: 600; color: var(--ok); }
.pb-text { color: var(--ink); font-size: 16px; line-height: 1.6; }
.pb-text p { margin: 0 0 8px; }
.pb-figwrap { display: flex; justify-content: center; margin: 6px 0 12px; }
.pb-ans { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 10px; }
.pb-ans .lg-input { width: 150px; max-width: 100%; text-align: center; font-variant-numeric: tabular-nums; }
.pb-tries { font-size: 13px; color: var(--ink-3); }
.pb-tries:empty { display: none; }
.pb-m { display: none; }
.pb-tools { margin: 10px 0 0; }
.pb-box {
  margin-top: 12px; padding: 12px 14px; border-radius: 14px; background: var(--fill-2);
  color: var(--ink-2); font-size: 15px; line-height: 1.55;
}
.pb-box b { color: var(--ink); }
.pb-box p { margin: 6px 0 0; }
.pb-hint p:first-child { margin-top: 0; }

/* figure: colori dal tema */
.pb-fig { max-width: 100%; height: auto; overflow: visible; }
.pb-fig .pb-fl { fill: var(--fill-2); stroke: var(--ink-2); stroke-width: 1.5; }
.pb-fig .pb-ln { fill: none; stroke: var(--ink-3); stroke-width: 2; stroke-linecap: round; }
.pb-fig .pb-ac { fill: color-mix(in srgb, #5e9cff 30%, transparent); stroke: #5e9cff; stroke-width: 2; stroke-linejoin: round; }
.pb-fig .pb-dot { fill: var(--ink); }
.pb-fig .pb-bg { fill: var(--ko-fill); stroke: none; }
.pb-fig .pb-ko { fill: none; stroke: var(--ko); stroke-width: 2.6; stroke-linecap: round; }
.pb-fig .pb-tx { fill: var(--ink-2); font-size: 14px; font-weight: 600; font-family: inherit; }

/* gara: impostazioni */
.pb-intro { color: var(--ink-2); font-size: 15px; line-height: 1.55; margin-bottom: 14px; }
.pb-intro p { margin: 0; }
.pb-row { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; margin: 0 0 12px; }
.pb-lab { min-width: 84px; font-size: 14px; font-weight: 600; color: var(--ink-2); }
.pb-best { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 6px; }
.pb-best .pb-lab { padding: 0; background: none; color: var(--ink-2); font-size: 14px; }
.pb-best span { padding: 6px 10px; border-radius: 10px; background: var(--fill); font-size: 13.5px; color: var(--ink-3); }
.pb-best b { color: var(--ink); margin-right: 4px; }

/* gara in corso */
.pb-clock {
  position: sticky; top: 8px; z-index: 5; display: flex; align-items: center; gap: 12px;
  padding: 10px 12px 10px 16px; margin-bottom: 14px; border-radius: 16px;
  background: var(--glass-1, var(--fill-3)); box-shadow: inset 0 0 0 0.5px var(--glass-edge, var(--stroke)), 0 6px 18px rgba(0, 0, 0, 0.12);
  -webkit-backdrop-filter: blur(18px); backdrop-filter: blur(18px);
}
.pb-clock .spacer { flex: 1; }
.pb-time { font-size: 22px; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--ink); }
.pb-time.low { color: var(--ko); }
.pb-filled { font-size: 13.5px; color: var(--ink-3); }
.pb-list { list-style: none; margin: 0 0 14px; padding: 0; display: flex; flex-direction: column; gap: 12px; }

/* risultato */
.pb-score { display: flex; align-items: center; gap: 18px; margin-bottom: 14px; color: var(--ink-2); font-size: 15px; line-height: 1.5; }
.pb-score b { color: var(--ink); }
.pb-big { font-size: 48px; font-weight: 800; line-height: 1; color: var(--ink); font-variant-numeric: tabular-nums; }
.pb-big small { font-size: 20px; font-weight: 600; color: var(--ink-3); }
.pb-score .pb-rec { color: var(--ok); }
.pb-rev { border-left: 4px solid transparent; }
.pb-rev.ok { border-left-color: var(--ok); }
.pb-rev.ko { border-left-color: var(--ko); }
.pb-mark { margin-left: auto; font-size: 18px; font-weight: 700; }
.pb-rev.ok .pb-mark { color: var(--ok); }
.pb-rev.ko .pb-mark { color: var(--ko); }
.pb-your { margin: 0 0 6px; font-size: 15px; color: var(--ink-2); }
.pb-your b { color: var(--ink); }
.pb-rev details summary { cursor: pointer; font-size: 14px; font-weight: 600; color: #5e9cff; padding: 4px 0; }
.pb-rev details[open] summary { margin-bottom: 8px; }

@media (max-width: 640px) {
  .pb-card, .pb-item { padding: 14px; border-radius: 16px; }
  .pb-text { font-size: 15.5px; }
  .pb-catdesc { display: none; }
  .pb-cats { width: 100%; display: flex; }
  .pb-cats button { flex: 1; padding-left: 0; padding-right: 0; }
  .pb-chip { min-width: 30px; height: 30px; font-size: 13px; }
  .pb-ans .lg-input { flex: 1; width: auto; min-width: 0; }
  .pb-tries { width: 100%; }
  .pb-tools { display: grid; grid-template-columns: 1fr 1fr; }
  .pb-tools .spacer { display: none; }
  .pb-m { display: inline; }
  .pb-lab { min-width: 0; width: 100%; }
  .pb-big { font-size: 40px; }
}