/* ==========================================================================
   Scienze — stile delle lezioni di biologia e chimica
   Pensato per lo studio a parole: definizioni, termini, confronti,
   processi a tappe, esempi dalla natura e domande da interrogazione.
   Tutto vive dentro <div class="sci">; il colore d'accento è var(--c).
   ========================================================================== */

.sci { --sc-soft: color-mix(in srgb, var(--c) 12%, transparent); --sc-line: color-mix(in srgb, var(--c) 55%, transparent); }

/* --- intestazione --- */
.sci .lesson-hero .lead { margin-bottom: 0; }
.sc-tags { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 18px 0 0; }
.sc-tags li {
  font-size: 13px; line-height: 1; padding: 7px 11px; border-radius: 999px;
  background: var(--sc-soft); color: var(--ink); font-weight: 550;
}
.sc-tags li::before { content: "#"; color: var(--c); margin-right: 2px; font-weight: 700; }

/* --- indice del capitolo (paragrafi numerati) --- */
.sc-index { counter-reset: sci; list-style: none; padding: 0; margin: 22px 0 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 6px 18px; }
.sc-index li { counter-increment: sci; font-size: 14.5px; }
.sc-index a { color: var(--ink-2); text-decoration: none; display: flex; gap: 8px; padding: 4px 0; }
.sc-index a::before { content: counter(sci, decimal-leading-zero); color: var(--c); font-weight: 700; font-variant-numeric: tabular-nums; }
.sc-index a:hover { color: var(--ink); }

/* --- paragrafo numerato --- */
.sci .block > h2 .sc-n {
  display: inline-block; font-size: 0.55em; vertical-align: 0.38em; margin-right: 10px;
  color: var(--c); font-weight: 700; letter-spacing: 0.04em; font-variant-numeric: tabular-nums;
}

/* --- termine scientifico nel testo --- */
.term { font-weight: 650; color: var(--ink); }
.sci-word { font-style: italic; }            /* nomi latini: Homo sapiens */
.sc-etym { font-size: 13.5px; color: var(--ink-3); font-style: italic; }

/* --- definizione --- */
.sc-def { margin: 22px 0; padding: 2px 0 2px 16px; border-left: 3px solid var(--c); }
.sc-def-term { display: flex; align-items: baseline; flex-wrap: wrap; gap: 4px 10px; font-family: var(--font-display); font-size: 18px; font-weight: 650; color: var(--ink); margin-bottom: 4px; }
.sc-def-term::before { content: "Definizione"; font-family: var(--font); font-size: 11px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--c); }
.sc-def p { margin: 0; }
.sc-def p + p { margin-top: 6px; }

/* --- glossario: termine → significato --- */
.sc-gloss { margin: 20px 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 10px; }
.sc-gloss > div { border: 1px solid var(--stroke); border-radius: var(--r); padding: 12px 14px; }
.sc-gloss dt { font-weight: 650; color: var(--ink); font-size: 15px; margin-bottom: 3px; }
.sc-gloss dt::before { content: ""; display: inline-block; width: 7px; height: 7px; border-radius: 2px; background: var(--c); margin-right: 8px; vertical-align: 1px; }
.sc-gloss dd { margin: 0; font-size: 14.5px; color: var(--ink-2); }

/* --- da ricordare --- */
.sc-key { margin: 24px 0; padding: 16px 20px; border-radius: var(--r); background: var(--sc-soft); }
.sc-key-title { display: block; font-size: 12px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink); margin-bottom: 8px; }
.sc-key-title::before { content: "★ "; color: var(--c); }
.sc-key ul, .sc-key ol { margin: 0; padding-left: 20px; }
.sc-key li { margin: 4px 0; font-size: 15.5px; }
.sc-key p { margin: 0 0 6px; }

/* --- in verifica / dagli appunti del professore --- */
.sc-prof { margin: 24px 0; padding: 14px 18px; border: 1px dashed var(--hint); border-radius: var(--r); }
.sc-prof-title { display: block; font-size: 12px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--hint); margin-bottom: 6px; }
.sc-prof p { margin: 0 0 6px; font-size: 15px; }
.sc-prof > div > :last-child, .sc-prof > :last-child { margin-bottom: 0; }
.sc-prof ul { margin: 0; padding-left: 20px; font-size: 15px; }

/* --- esempio dalla natura --- */
.sc-ex { margin: 20px 0; padding: 12px 16px; border-radius: var(--r); border: 1px solid var(--stroke); font-size: 15px; }
.sc-ex::before { content: "Esempio"; display: block; font-size: 11px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 4px; }
.sc-ex > :last-child { margin-bottom: 0; }

/* --- citazione da una fonte (storia, filosofia) --- */
.sci blockquote { margin: 20px 0; padding: 4px 0 4px 18px; border-left: 3px solid var(--sc-line); }
.sci blockquote p { margin: 0 0 4px; font-style: italic; color: var(--ink); }
.sci blockquote cite { display: block; font-size: 13.5px; font-style: normal; color: var(--ink-3); }

/* --- processo a tappe --- */
.sc-steps { counter-reset: st; list-style: none; padding: 0; margin: 22px 0; }
.sc-steps > li { counter-increment: st; position: relative; padding: 0 0 18px 46px; }
.sc-steps > li::before {
  content: counter(st); position: absolute; left: 0; top: -2px; width: 30px; height: 30px; border-radius: 50%;
  display: grid; place-items: center; font-size: 14px; font-weight: 700; color: var(--c); background: var(--sc-soft);
}
.sc-steps > li:not(:last-child)::after { content: ""; position: absolute; left: 14.5px; top: 32px; bottom: 2px; width: 1px; background: var(--stroke-2); }
.sc-steps > li > b:first-child { display: block; color: var(--ink); margin-bottom: 2px; }
.sc-steps > li > p { margin: 0; font-size: 15.5px; }

/* --- tabelle di confronto --- */
.sc-table th, .sc-table td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--stroke); font-size: 14.5px; }
.sc-table thead th { font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-3); font-weight: 700; }
.sc-table tbody th { color: var(--ink); font-weight: 650; white-space: nowrap; }
.sc-table td { color: var(--ink-2); }

/* --- schema a albero / classificazione --- */
.sc-tree, .sc-tree ul { list-style: none; margin: 0; padding: 0; }
.sc-tree { margin: 22px 0; font-size: 15px; }
.sc-tree ul { padding-left: 22px; border-left: 1px solid var(--stroke-2); margin-left: 6px; }
.sc-tree li { position: relative; padding: 4px 0 4px 14px; }
.sc-tree ul > li::before { content: ""; position: absolute; left: -22px; top: 15px; width: 30px; height: 1px; background: var(--stroke-2); }
.sc-tree li > b { color: var(--ink); }
.sc-tree li > span { color: var(--ink-3); font-size: 14px; }

/* --- colonne a confronto --- */
.sc-vs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 22px 0; }
.sc-vs > div { border: 1px solid var(--stroke); border-radius: var(--r); padding: 14px 16px; }
.sc-vs h4 { font-size: 16px; margin: 0 0 6px; color: var(--ink); }
.sc-vs ul { margin: 0; padding-left: 18px; font-size: 14.5px; }
.sc-vs p { font-size: 14.5px; margin: 0 0 6px; }
@media (max-width: 640px) { .sc-vs, .sc-gloss { grid-template-columns: 1fr; } }

/* --- figure SVG: colori che seguono il tema --- */
.sci .figure svg { max-height: 560px; max-width: 520px; display: block; }
@media (max-width: 640px) {
  .sci .figure { padding: 14px 8px; }
  .sci .figure figcaption { padding: 0 6px; }
}
/* disegno accanto a una tappa (fasi della mitosi e della meiosi) */
.sc-steps .sc-pic { display: block; width: 100%; max-width: 340px; height: auto; margin: 10px 0 8px; }
.sc-steps .sc-pic text { font-family: var(--font); font-size: 13px; }

/* --- per saperne di più: approfondimento del libro --- */
.sc-more { margin: 26px 0; padding: 16px 18px; border-radius: var(--r); background: var(--fill); }
.sc-more-title { display: block; font-size: 12px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--c); margin-bottom: 4px; }
.sc-more h4 { margin: 0 0 8px; font-size: 17px; color: var(--ink); }
.sc-more p { font-size: 15.5px; }
.sc-more > :last-child { margin-bottom: 0; }
:is(.figure, .sc-pic) .s-ink { fill: var(--ink); }
:is(.figure, .sc-pic) .s-mut { fill: var(--ink-3); }
:is(.figure, .sc-pic) .s-fill { fill: var(--fill-2); }
:is(.figure, .sc-pic) .s-bg { fill: var(--tray); }
:is(.figure, .sc-pic) .s-line { stroke: var(--ink-3); fill: none; }
:is(.figure, .sc-pic) .s-strong { stroke: var(--ink-2); fill: none; }
:is(.figure, .sc-pic) .s-acc { fill: var(--c); }
:is(.figure, .sc-pic) .s-acc-l { stroke: var(--c); fill: none; }
:is(.figure, .sc-pic) .s-acc-s { fill: color-mix(in srgb, var(--c) 22%, transparent); stroke: var(--c); }
:is(.figure, .sc-pic) .s-blue { fill: #2997ff; }   :is(.figure, .sc-pic) .s-blue-s { fill: rgba(41, 151, 255, .18); stroke: #2997ff; }
:is(.figure, .sc-pic) .s-red { fill: #ff453a; }    :is(.figure, .sc-pic) .s-red-s { fill: rgba(255, 69, 58, .16); stroke: #ff453a; }
:is(.figure, .sc-pic) .s-orange { fill: #ff9f0a; } :is(.figure, .sc-pic) .s-orange-s { fill: rgba(255, 159, 10, .18); stroke: #ff9f0a; }
:is(.figure, .sc-pic) .s-purple { fill: #bf5af2; } :is(.figure, .sc-pic) .s-purple-s { fill: rgba(191, 90, 242, .18); stroke: #bf5af2; }
:is(.figure, .sc-pic) .s-yellow { fill: #e6b84a; } :is(.figure, .sc-pic) .s-yellow-s { fill: rgba(230, 184, 74, .2); stroke: #c9a227; }
:is(.figure, .sc-pic) .s-green { fill: #30d158; } :is(.figure, .sc-pic) .s-green-s { fill: rgba(48, 209, 88, .16); stroke: #30d158; }
/* solo contorno colorato: fibre del fuso, cromatidi disegnati come tratti */
:is(.figure, .sc-pic) .s-blue-l { stroke: #2997ff; fill: none; } :is(.figure, .sc-pic) .s-red-l { stroke: #ff453a; fill: none; }
:is(.figure, .sc-pic) .s-green-l { stroke: #30d158; fill: none; } :is(.figure, .sc-pic) .s-orange-l { stroke: #ff9f0a; fill: none; }
:is(.figure, .sc-pic) .s-purple-l { stroke: #bf5af2; fill: none; }
:is(.figure svg, svg.sc-pic) text { font-size: 13px; }
:is(.figure svg, svg.sc-pic) text.s-sm { font-size: 11.5px; }
:is(.figure svg, svg.sc-pic) text.s-lg { font-size: 15px; font-weight: 650; }

/* --- domande da interrogazione --- */
.sci .faq summary { font-weight: 550; }
.sc-oral-note { font-size: 14px; color: var(--ink-3); margin: 0 0 8px; }

/* --- equazione chimica in evidenza --- */
.sc-eq {
  margin: 20px 0; padding: 14px 16px; text-align: center; overflow-x: auto;
  border-top: 1px solid var(--stroke); border-bottom: 1px solid var(--stroke);
  font-size: 16px; color: var(--ink);
}
.sc-eq .katex { font-size: 1.15em; }