/* =========================================================
   ARTICLE (contenuto)
   ========================================================= */

.article-area {
  padding: 2rem;
  /* Gestisce lo scroll dell'articolo separatamente */
  overflow-y: auto;
  height: 100%;
}

/* wrapper principale dell’articolo */
.article {
  max-width: 900px;
  margin: 0 auto;
  padding: 0;
  color: #1a1a1a;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
  font-size: 1rem;
}

/* titolo principale (di solito il primo <h1> dell’html) */
.article h1,
.article__title {
  font-size: clamp(1.9rem, 1.3rem + 0.8vw, 2.3rem);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 0.5rem;
  color: #1a1a1a;
}

/* meta info (autore, data, categoria) */
.article__meta {
  color: #666;
  font-size: 0.85rem;
  margin-bottom: 1.8rem;
}

/* sottotitoli */
.article h2,
.article__subtitle {
  font-size: 1.4rem;
  font-weight: 600;
  margin-top: 2.2rem;
  margin-bottom: 0.75rem;
  border-left: 4px solid #0a1535;
  padding-left: 0.6rem;
  line-height: 1.3;
}

.article h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 1.7rem;
  margin-bottom: 0.5rem;
  border-left: 3px solid #aaa;
  padding-left: 0.5rem;
  line-height: 1.3;
}

.article h4 {
  font-size: 1rem;
  font-weight: 500;
  margin-top: 1.3rem;
  margin-bottom: 0.4rem;
}

/* paragrafi normali */
.article p {
  margin: 0.9rem 0;
  text-align: justify;
}

/* paragrafo introduttivo */
.article__lead,
.article p.lead {
  font-size: 1.05rem;
  color: #333;
}

/* liste */
.article ul,
.article ol {
  margin: 1rem 0 1rem 1.6rem;
}
.article li {
  margin: 0.35rem 0;
}

/* citazioni */
.article blockquote,
.article__quote {
  background: #fff;
  border-left: 4px solid #999;
  margin: 1.5rem 0;
  padding: 0.75rem 1rem 0.75rem 1.25rem;
  border-radius: 6px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.025);
  color: #333;
  font-style: italic;
}

/* figure */
.article figure {
  background: #ffffff;
  border: 1px solid #ddd;
  border-radius: 8px;
  box-shadow: 0 16px 40px rgba(0,0,0,0.04);
  padding: 1rem;
  margin: 2rem auto;
  text-align: center;
  max-width: 480px;
}
.article figcaption {
  font-size: 0.85rem;
  color: #555;
  margin-top: 0.75rem;
  line-height: 1.4;
}

/* linee orizzontali */
.article hr {
  border: 0;
  border-top: 1px solid #ddd;
  margin: 2.5rem 0;
}

/* =========================================================
   BOX MATEMATICI / STRUTTURATI
   ========================================================= */

/* base per un box */
.article__box {
  background: #ffffff;
  border-radius: 8px;
  padding: 1rem 1.1rem 1rem 1.3rem;
  margin: 1.6rem 0;
  box-shadow: 0 8px 30px rgba(0,0,0,0.02);
  border-left: 4px solid transparent;
}

/* titolo interno del box */
.article__box-title {
  font-weight: 600;
  margin-bottom: 0.5rem;
}

/* tipi */
.article__box--theorem {
  border-left-color: #2e6fdd;
}
.article__box--definition {
  border-left-color: #b66afc;
}
.article__box--proof {
  border-left-color: #0a0;
}
.article__box--note {
  border-left-color: #999;
  background-image: repeating-linear-gradient(
    -45deg,
    rgba(0,0,0,0.02) 0px,
    rgba(0,0,0,0.02) 6px,
    rgba(0,0,0,0) 6px,
    rgba(0,0,0,0) 12px
  );
}

/* QED */
.article__qed {
  text-align: right;
  font-weight: 500;
  font-size: 0.85rem;
  margin-top: 0.8rem;
}

/* =========================================================
   CODICE / PRE
   ========================================================= */
.article code {
  background: #eef;
  border-radius: 4px;
  padding: 2px 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.9rem;
}

.article pre {
  background: #eee;
  border-radius: 6px;
  padding: 1rem;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.4;
  border: 1px solid #ddd;
  margin: 1.8rem 0;
}
.article pre code {
  background: transparent;
  padding: 0;
}


/* =========================================================
   MATHJAX / FORMULE
   ========================================================= */


/* Formule display: $$ ... $$ */
.article mjx-container[display="true"] {
  display: block !important;
  text-align: center;
  margin: 1.5rem 0;
}

/* Formule inline: $ ... $ */
.article mjx-container:not([display="true"]) {
  display: inline-block !important;
  margin: 0 !important;
  padding: 0 !important;
  vertical-align: middle;
}

/* =========================================================
   UTILITY
   ========================================================= */
.article .center {
  text-align: center;
}
.article .small {
  font-size: 0.8rem;
  color: #777;
}