/* ==========================================================================
   Storia — mappe concettuali e catene di cause ed effetti
   Si usano dentro <div class="sci st"> (vedi scienze.css); il colore è var(--c).

   Mappa: un concetto centrale e alcuni rami, ognuno una colonna di riquadri
   collegati da frecce. --cols indica quanti rami ci sono.
     <figure class="st-map" style="--cols:3">
       <figcaption class="st-map-title">Titolo</figcaption>
       <div class="st-map-root">Concetto</div>
       <div class="st-map-cols">
         <div class="st-map-col"><div>ramo</div><div>conseguenza</div></div>
       </div>
     </figure>

   Catena: <ol class="st-chain"><li><b>Causa</b>testo</li><li>…</li></ol>
   ========================================================================== */

.st-map { --cols: 3; --gap: 12px; margin: 26px 0; padding: 18px 16px 18px; border: 1px solid var(--stroke); border-radius: var(--r); background: var(--tray); }
.st-map-title {
  display: block; text-align: center; margin: 0 0 14px;
  font-size: 12px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3);
}
.st-map-root {
  position: relative; display: table; margin: 0 auto; padding: 8px 18px; max-width: 90%;
  border: 1.5px solid var(--c); border-radius: 999px; background: var(--sc-soft);
  color: var(--ink); font-weight: 650; font-size: 15px; text-align: center; line-height: 1.3;
}
.st-map-root::after { content: ""; position: absolute; left: 50%; top: 100%; height: 12px; border-left: 1.5px solid var(--sc-line); }
.st-map-cols { position: relative; display: grid; grid-template-columns: repeat(var(--cols), minmax(0, 1fr)); gap: var(--gap); margin-top: 24px; }
/* linea orizzontale fra il centro della prima e dell'ultima colonna */
.st-map-cols::before {
  content: ""; position: absolute; top: -12px;
  left: calc((100% - (var(--cols) - 1) * var(--gap)) / var(--cols) / 2);
  right: calc((100% - (var(--cols) - 1) * var(--gap)) / var(--cols) / 2);
  border-top: 1.5px solid var(--sc-line);
}
.st-map-col { position: relative; display: flex; flex-direction: column; }
.st-map-col::before { content: ""; position: absolute; left: 50%; top: -12px; height: 12px; border-left: 1.5px solid var(--sc-line); }
.st-map-col > div {
  position: relative; padding: 8px 10px; border: 1px solid var(--stroke-2); border-radius: 10px;
  background: var(--raised); color: var(--ink-2); font-size: 13.5px; line-height: 1.38; text-align: center;
}
.st-map-col > div:first-child { border-color: var(--c); color: var(--ink); font-weight: 600; }
.st-map-col > div b { color: var(--ink); }
.st-map-col > div + div { margin-top: 22px; }
.st-map-col > div + div::before { content: ""; position: absolute; left: 50%; top: -22px; height: 15px; border-left: 1.5px solid var(--sc-line); }
.st-map-col > div + div::after {
  content: ""; position: absolute; left: calc(50% - 4px); top: -8px; width: 0; height: 0;
  border-left: 4.5px solid transparent; border-right: 4.5px solid transparent; border-top: 6px solid var(--sc-line);
}
.st-map > p.st-map-note { margin: 14px 0 0; font-size: 13.5px; color: var(--ink-3); text-align: center; }

/* --- catena di cause ed effetti --- */
.st-chain { list-style: none; display: flex; gap: 30px; padding: 0; margin: 22px 0; align-items: stretch; }
.st-chain > li {
  position: relative; flex: 1 1 0; min-width: 0; padding: 10px 12px;
  border: 1px solid var(--stroke-2); border-radius: 10px; background: var(--raised);
  font-size: 14px; line-height: 1.4; color: var(--ink-2);
}
.st-chain > li > b:first-child { display: block; margin-bottom: 3px; font-size: 11px; font-weight: 700; letter-spacing: 0.07em; text-transform: uppercase; color: var(--c); }
.st-chain > li + li::before { content: "→"; position: absolute; left: -23px; top: 50%; transform: translateY(-50%); color: var(--c); font-weight: 700; font-size: 16px; }

/* tabelle: sul telefono anche le intestazioni vanno a capo */
.st .sc-table { width: 100%; }

@media (max-width: 640px) {
  .st .sc-table th, .st .sc-table td { padding: 9px 8px; font-size: 14px; }
  .st .sc-table tbody th { white-space: normal; }
  .st-map { padding: 16px 12px; }
  .st-map-cols { grid-template-columns: 1fr; gap: 14px; margin-top: 14px; }
  .st-map-cols::before, .st-map-col::before, .st-map-root::after { display: none; }
  .st-map-col { padding-left: 12px; border-left: 2px solid var(--sc-line); }
  .st-map-col > div { text-align: left; }
  .st-map-col > div + div { margin-top: 18px; }
  .st-map-col > div + div::before { left: 18px; top: -18px; height: 12px; }
  .st-map-col > div + div::after { left: 14px; top: -7px; }
  .st-chain { flex-direction: column; gap: 22px; }
  .st-chain > li + li::before { content: "↓"; left: 50%; top: -20px; transform: translateX(-50%); }
}