/* =================================================================
   ESAMI · Costruzioni Aeronautiche
   Sistema editoriale-tecnico · palette aero
   ================================================================= */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght,SOFT@9..144,300..900,0..100&family=IBM+Plex+Sans:ital,wght@0,300;0,400;0,500;0,600;1,400;1,500&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  /* Palette: parchment + deep aero blue + warm rust */
  --paper: #f7f2e8;
  --paper-2: #efe9dc;        /* card background */
  --paper-3: #e6dfcf;        /* deeper accent surface */
  --ink: #1a1d24;            /* near-black with slight blue tint */
  --ink-2: #3a3f4a;
  --ink-3: #6c7180;
  --rule: #d4ccba;           /* hairline */
  --rule-soft: #e1dac8;
  --aero: #1d3557;           /* bluaero */
  --aero-2: #2c4a70;
  --rust: #a8412c;           /* rossoavv refined */
  --emerald: #2d6a4f;        /* verdeok refined */
  --gold: #a8884a;           /* understated brass */
  --amber: #c89438;
  --shadow-1: 0 1px 0 rgba(26,29,36,0.04), 0 4px 14px -4px rgba(26,29,36,0.08);
  --shadow-2: 0 2px 0 rgba(26,29,36,0.05), 0 12px 32px -8px rgba(26,29,36,0.16);

  /* Tipografia */
  --serif: 'Fraunces', 'EB Garamond', Georgia, serif;
  --sans: 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  --mono: 'IBM Plex Mono', 'JetBrains Mono', Consolas, monospace;

  /* Spacing scale */
  --s-1: 0.25rem;
  --s-2: 0.5rem;
  --s-3: 0.75rem;
  --s-4: 1rem;
  --s-5: 1.5rem;
  --s-6: 2rem;
  --s-7: 3rem;
  --s-8: 4.5rem;
  --s-9: 6rem;

  /* Misure */
  --measure: 68ch;
  --max-w: 1280px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #161a20;
    --paper-2: #1e232b;
    --paper-3: #262c36;
    --ink: #f0eadb;
    --ink-2: #c4bfb0;
    --ink-3: #8a8678;
    --rule: #2a3038;
    --rule-soft: #232830;
    --aero: #6fa0d8;
    --aero-2: #4a82bf;
    --rust: #d6633f;
    --emerald: #6abe92;
    --gold: #d4ad6a;
    --amber: #e8b35a;
    --shadow-1: 0 1px 0 rgba(0,0,0,0.3), 0 4px 14px -4px rgba(0,0,0,0.5);
    --shadow-2: 0 2px 0 rgba(0,0,0,0.4), 0 12px 32px -8px rgba(0,0,0,0.6);
  }
}

* { box-sizing: border-box; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--sans);
  font-feature-settings: 'ss01', 'cv11';
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  background-image:
    radial-gradient(ellipse at top, rgba(168, 136, 74, 0.05), transparent 60%),
    radial-gradient(ellipse at bottom right, rgba(29, 53, 87, 0.04), transparent 60%);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* =====  Header globale  ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  border-bottom: 1px solid var(--rule);
}

.site-header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--s-4) var(--s-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: var(--s-3);
  text-decoration: none;
  color: var(--ink);
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.15rem;
  font-variation-settings: 'opsz' 144;
  letter-spacing: -0.01em;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  color: var(--aero);
}

.brand-mark::before {
  content: '';
  display: inline-block;
  width: 1.6em;
  height: 1.6em;
  background: linear-gradient(135deg, var(--aero), var(--aero-2));
  -webkit-mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M2 16l9-1.5 4.5 5L17 19l-2-7 6-2.5L19 8l-7 2-3.5-6-1.5.5L9 11 2 13z' fill='black'/></svg>") no-repeat center/contain;
          mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M2 16l9-1.5 4.5 5L17 19l-2-7 6-2.5L19 8l-7 2-3.5-6-1.5.5L9 11 2 13z' fill='black'/></svg>") no-repeat center/contain;
}

.brand-sub {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--ink-3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--s-5);
}

.site-nav a {
  color: var(--ink-2);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.15s;
}

.site-nav a:hover {
  color: var(--aero);
}

@media (max-width: 720px) {
  .site-header-inner { padding: var(--s-3) var(--s-4); }
  .brand-sub { display: none; }
  .site-nav { gap: var(--s-3); }
  .site-nav a { font-size: 0.85rem; }
}

/* =====  Container  ===== */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--s-5);
}

@media (max-width: 720px) {
  .container { padding: 0 var(--s-4); }
}

/* =====  HOMEPAGE: hero  ===== */
.hero {
  padding: var(--s-9) 0 var(--s-7);
  border-bottom: 1px solid var(--rule);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 30%;
  right: -10%;
  width: 50%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(29, 53, 87, 0.08), transparent 65%);
  pointer-events: none;
  z-index: 0;
}

.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--s-5);
  position: relative;
  z-index: 1;
}

.hero-eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--rust);
  margin-bottom: var(--s-5);
  display: flex;
  align-items: center;
  gap: var(--s-3);
}

.hero-eyebrow::before {
  content: '';
  width: 2.5rem;
  height: 1px;
  background: var(--rust);
}

.hero-title {
  font-family: var(--serif);
  font-weight: 350;
  font-size: clamp(2.4rem, 6.5vw, 5.5rem);
  line-height: 0.95;
  letter-spacing: -0.025em;
  color: var(--ink);
  margin: 0 0 var(--s-5);
  font-variation-settings: 'opsz' 144, 'SOFT' 30;
}

.hero-title em {
  font-style: italic;
  color: var(--aero);
  font-variation-settings: 'opsz' 144, 'SOFT' 60;
}

.hero-lede {
  font-family: var(--serif);
  font-size: clamp(1.05rem, 1.7vw, 1.35rem);
  line-height: 1.5;
  font-weight: 350;
  color: var(--ink-2);
  max-width: 60ch;
  margin: 0 0 var(--s-6);
  font-variation-settings: 'opsz' 24;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-6);
  padding-top: var(--s-5);
  border-top: 1px solid var(--rule);
  font-size: 0.85rem;
  color: var(--ink-3);
}

.hero-meta strong {
  color: var(--ink);
  font-family: var(--mono);
  font-weight: 500;
  letter-spacing: -0.02em;
  font-size: 0.95rem;
  display: block;
  margin-bottom: 0.25rem;
}

@media (max-width: 720px) {
  .hero { padding: var(--s-7) 0 var(--s-6); }
  .hero-meta { gap: var(--s-4); }
}


/* =====  HOMEPAGE: premessa didattica  ===== */
.purpose-section {
  padding: var(--s-8) 0 0;
}

.purpose-card {
  max-width: 920px;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-left: 4px solid var(--aero);
  border-radius: 6px;
  padding: var(--s-5) var(--s-6);
  box-shadow: var(--shadow-1);
}

.purpose-card p {
  font-family: var(--serif);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0 0 var(--s-4);
  font-variation-settings: 'opsz' 24;
}

.purpose-card p:last-child { margin-bottom: 0; }

.purpose-card .purpose-signature {
  margin-top: var(--s-5);
  text-align: right;
  font-family: var(--serif);
  color: var(--ink);
}


@media (max-width: 720px) {
  .purpose-card { padding: var(--s-4); }
}

/* =====  HOMEPAGE: indice esami  ===== */
.exams-section {
  padding: var(--s-8) 0;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--s-6);
  flex-wrap: wrap;
  gap: var(--s-3);
}

.section-title {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  margin: 0;
  letter-spacing: -0.01em;
  font-variation-settings: 'opsz' 96;
}

.section-title-sub {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.exams-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--s-4);
}

.exam-card {
  position: relative;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: var(--s-5);
  text-decoration: none;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  transition: transform 0.2s ease, border-color 0.2s, background 0.2s;
  overflow: hidden;
}

.exam-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--aero);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.exam-card:hover {
  transform: translateY(-2px);
  border-color: var(--aero);
  background: var(--paper);
  box-shadow: var(--shadow-1);
}

.exam-card:hover::before {
  transform: scaleX(1);
}

.exam-card.is-suppl::before { background: var(--gold); }
.exam-card.is-suppl:hover { border-color: var(--gold); }

.exam-card.is-straord::before { background: var(--rust); }
.exam-card.is-straord:hover { border-color: var(--rust); }

.exam-card.is-mim::before { background: var(--emerald); }
.exam-card.is-mim:hover { border-color: var(--emerald); }

.exam-year {
  font-family: var(--serif);
  font-size: 3rem;
  font-weight: 350;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--aero);
  font-variation-settings: 'opsz' 144, 'SOFT' 50;
}

.is-suppl .exam-year { color: var(--gold); }
.is-straord .exam-year { color: var(--rust); }
.is-mim .exam-year { color: var(--emerald); }

.exam-type {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.exam-subtitle {
  font-size: 0.92rem;
  color: var(--ink-2);
  line-height: 1.5;
  margin: 0;
}

.exam-arrow {
  margin-top: auto;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  display: flex;
  align-items: center;
  gap: 0.4em;
  transition: color 0.2s, gap 0.2s;
}

.exam-card:hover .exam-arrow {
  color: var(--aero);
  gap: 0.7em;
}

.exam-arrow::after {
  content: '→';
  font-size: 1rem;
}

/* =====  PAGINA SINGOLA: layout  ===== */
.exam-page {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s-6);
  padding: var(--s-7) 0 var(--s-9);
}

@media (min-width: 980px) {
  .exam-page {
    grid-template-columns: minmax(0, 1fr) 18rem;
    gap: var(--s-7);
  }
}

.exam-header {
  border-bottom: 1px solid var(--rule);
  padding-bottom: var(--s-6);
  margin-bottom: var(--s-6);
}

.exam-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  text-decoration: none;
  margin-bottom: var(--s-5);
  transition: color 0.15s;
}

.exam-back:hover { color: var(--aero); }

.exam-back::before {
  content: '←';
  font-size: 1rem;
}

.exam-eyebrow {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--rust);
  margin-bottom: var(--s-3);
}

.exam-eyebrow span { color: var(--ink-3); }
.exam-eyebrow .dot { color: var(--rule); }

.exam-title {
  font-family: var(--serif);
  font-weight: 350;
  font-size: clamp(2rem, 4.5vw, 3.5rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin: 0 0 var(--s-3);
  font-variation-settings: 'opsz' 144, 'SOFT' 30;
}

.exam-deck {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--ink-2);
  line-height: 1.5;
  font-weight: 350;
  font-variation-settings: 'opsz' 24, 'SOFT' 60;
  margin: 0;
}

/* =====  Sidebar TOC  ===== */
.exam-aside {
  position: relative;
}

@media (min-width: 980px) {
  .exam-aside-inner {
    position: sticky;
    top: 5rem;
    padding-left: var(--s-5);
    border-left: 1px solid var(--rule);
  }
}

.toc-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: var(--s-3);
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.88rem;
}

.toc-list a {
  color: var(--ink-2);
  text-decoration: none;
  display: block;
  padding: 0.3em 0;
  border-bottom: 1px dotted transparent;
  transition: color 0.15s, border-color 0.15s;
  line-height: 1.4;
}

.toc-list a:hover {
  color: var(--aero);
  border-bottom-color: var(--aero);
}

.toc-list a.active {
  color: var(--aero);
  font-weight: 500;
}

.toc-num {
  font-family: var(--mono);
  font-size: 0.78em;
  color: var(--ink-3);
  margin-right: 0.5em;
}

@media (max-width: 979px) {
  .exam-aside-inner {
    background: var(--paper-2);
    border: 1px solid var(--rule);
    padding: var(--s-4);
    border-radius: 4px;
  }
  .toc-list { font-size: 0.92rem; }
}

/* =====  Article: tipografia di lettura  ===== */
.exam-article {
  max-width: var(--measure);
  font-size: 1.02rem;
  line-height: 1.7;
}

.exam-article > p {
  margin: 0 0 1.1em;
  hyphens: auto;
  -webkit-hyphens: auto;
  text-align: justify;
  text-justify: inter-word;
}

.exam-article p:first-of-type::first-letter {
  /* drop cap on first paragraph after header */
}

.exam-article h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.4rem, 2.4vw, 1.8rem);
  letter-spacing: -0.015em;
  margin: 2.2em 0 0.6em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--rule);
  font-variation-settings: 'opsz' 96, 'SOFT' 30;
  scroll-margin-top: 5rem;
}

.exam-article h2::before {
  content: '§';
  color: var(--aero);
  font-style: italic;
  margin-right: 0.4em;
  font-weight: 350;
}

.exam-article h3 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.2rem;
  margin: 1.8em 0 0.5em;
  letter-spacing: -0.005em;
  font-variation-settings: 'opsz' 36;
  color: var(--aero);
  scroll-margin-top: 5rem;
}

.exam-article h4 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 1.5em 0 0.4em;
  color: var(--ink-2);
}

.exam-article .para-head {
  margin: 1.2em 0 0.3em;
}

.exam-article strong {
  font-weight: 600;
  color: var(--ink);
}

.exam-article em {
  font-style: italic;
}

.exam-article a {
  color: var(--aero);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.exam-article ul,
.exam-article ol {
  padding-left: 1.4em;
  margin: 0 0 1.1em;
}

.exam-article ul li,
.exam-article ol li {
  margin-bottom: 0.4em;
}

.exam-article ul {
  list-style: none;
  padding-left: 0;
}

.exam-article ul li {
  position: relative;
  padding-left: 1.4em;
}

.exam-article ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.8em;
  width: 0.6em;
  height: 1px;
  background: var(--aero);
}

.exam-article ol {
  list-style: none;
  counter-reset: item;
  padding-left: 0;
}

.exam-article ol > li {
  counter-increment: item;
  position: relative;
  padding-left: 2.2em;
}

.exam-article ol > li::before {
  content: counter(item);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.85em;
  color: var(--aero);
  background: var(--paper-2);
  width: 1.6em;
  height: 1.6em;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--rule);
  margin-top: 0.15em;
}

.exam-article dl {
  margin: 0 0 1.1em;
}

.exam-article dt {
  font-weight: 600;
  color: var(--aero);
  font-family: var(--sans);
  margin-top: 0.7em;
}

.exam-article dd {
  margin-left: 0;
  margin-bottom: 0.5em;
  padding-left: 1em;
  border-left: 2px solid var(--rule-soft);
}

.exam-article code {
  font-family: var(--mono);
  font-size: 0.92em;
  background: var(--paper-3);
  padding: 0.08em 0.35em;
  border-radius: 2px;
}

.exam-article u { text-decoration: none; border-bottom: 1px solid currentColor; }
.exam-article .sc { font-variant: small-caps; letter-spacing: 0.05em; }
.exam-article .sf { font-family: var(--sans); }
.exam-article .ref { color: var(--ink-3); font-family: var(--mono); font-size: 0.9em; }

/* =====  Quesito: il blocco distintivo  ===== */
.quesito {
  margin: var(--s-6) 0 var(--s-5);
  padding: var(--s-4) var(--s-5);
  background: linear-gradient(135deg, var(--paper-2) 0%, var(--paper-2) 60%, var(--paper-3) 100%);
  border-left: 4px solid var(--aero);
  border-radius: 0 4px 4px 0;
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  position: relative;
  overflow: hidden;
}

.quesito::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 8em;
  height: 8em;
  background: radial-gradient(circle at top right, rgba(29,53,87,0.06), transparent 70%);
  pointer-events: none;
}

.quesito-num {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--aero);
  font-weight: 500;
}

.quesito-text {
  font-family: var(--serif);
  font-size: 1.15rem;
  line-height: 1.4;
  font-style: italic;
  color: var(--ink);
  font-weight: 350;
  font-variation-settings: 'opsz' 36, 'SOFT' 50;
}

/* =====  Callout boxes  ===== */
.callout {
  margin: var(--s-5) 0;
  padding: var(--s-4) var(--s-5);
  border-left: 3px solid var(--aero);
  background: color-mix(in srgb, var(--paper-2) 70%, transparent);
  border-radius: 0 4px 4px 0;
  position: relative;
}

.callout-label {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--aero);
  font-weight: 500;
  margin-bottom: var(--s-3);
  padding: 0.15em 0.6em;
  background: color-mix(in srgb, var(--aero) 12%, transparent);
  border-radius: 2px;
}

.callout-body > *:last-child { margin-bottom: 0; }
.callout-body > *:first-child { margin-top: 0; }

.box-teoria { border-left-color: var(--aero); }
.box-teoria .callout-label { color: var(--aero); background: color-mix(in srgb, var(--aero) 12%, transparent); }

.box-ipotesi { border-left-color: var(--gold); }
.box-ipotesi .callout-label { color: var(--gold); background: color-mix(in srgb, var(--gold) 14%, transparent); }

.box-risultati { border-left-color: var(--emerald); background: color-mix(in srgb, var(--emerald) 5%, var(--paper-2)); }
.box-risultati .callout-label { color: var(--emerald); background: color-mix(in srgb, var(--emerald) 14%, transparent); }

.box-avviso { border-left-color: var(--rust); background: color-mix(in srgb, var(--rust) 4%, var(--paper-2)); }
.box-avviso .callout-label { color: var(--rust); background: color-mix(in srgb, var(--rust) 12%, transparent); }
.box-avviso .callout-label::before { content: '⚠ '; }

.box-esempio { border-left-color: var(--amber); }
.box-esempio .callout-label { color: var(--amber); background: color-mix(in srgb, var(--amber) 14%, transparent); }

.box-fase { border-left-color: var(--ink-3); }
.box-fase .callout-label { color: var(--ink-2); background: color-mix(in srgb, var(--ink-3) 12%, transparent); }

/* =====  Figure & tabelle  ===== */
.block-figure,
.figure-placeholder {
  margin: var(--s-5) 0;
  padding: var(--s-5);
  background: var(--paper-2);
  border: 1px dashed var(--rule);
  border-radius: 4px;
  text-align: center;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 0.85rem;
}

.block-figure figcaption {
  margin-top: var(--s-3);
  font-size: 0.85rem;
  color: var(--ink-3);
  font-style: italic;
  font-family: var(--serif);
  font-weight: 350;
}

.table-wrap {
  margin: var(--s-5) 0;
  overflow-x: auto;
  border: 1px solid var(--rule);
  border-radius: 4px;
}

.table-wrap table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.92rem;
  font-family: var(--sans);
}

.table-wrap td {
  padding: 0.55em 0.9em;
  border-bottom: 1px solid var(--rule-soft);
  vertical-align: top;
}

.table-wrap tr:first-child td {
  font-weight: 600;
  color: var(--aero);
  background: color-mix(in srgb, var(--aero) 6%, var(--paper-2));
  border-bottom: 1px solid var(--rule);
}

.table-wrap tr:last-child td {
  border-bottom: none;
}

.table-wrap figcaption {
  padding: var(--s-3);
  font-size: 0.85rem;
  color: var(--ink-3);
  font-style: italic;
  font-family: var(--serif);
  border-top: 1px solid var(--rule-soft);
  background: var(--paper-2);
}

/* =====  Math (KaTeX)  ===== */
.exam-article .katex { font-size: 1.05em; }
.exam-article .katex-display {
  margin: 1.2em 0;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.5em 0;
}

/* =====  Footer  ===== */
.site-footer {
  border-top: 1px solid var(--rule);
  margin-top: var(--s-8);
  padding: var(--s-6) 0 var(--s-5);
  font-size: 0.85rem;
  color: var(--ink-3);
}

.site-footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--s-5);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--s-3);
}

.site-footer p { margin: 0; }
.site-footer .credit {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
}

/* =====  Pagination tra esami  ===== */
.exam-pagination {
  margin: var(--s-8) 0 0;
  padding-top: var(--s-6);
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-4);
}

.exam-pagination a {
  display: flex;
  flex-direction: column;
  gap: 0.2em;
  padding: var(--s-4);
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 4px;
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.2s, transform 0.2s;
}

.exam-pagination a:hover {
  border-color: var(--aero);
  transform: translateY(-1px);
}

.exam-pagination .label {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.exam-pagination .next { text-align: right; align-items: flex-end; }

.exam-pagination .title {
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 400;
  font-variation-settings: 'opsz' 36;
}

.exam-pagination .placeholder {
  background: transparent;
  border: 1px dashed var(--rule);
  pointer-events: none;
  opacity: 0.4;
}

@media (max-width: 540px) {
  .exam-pagination { grid-template-columns: 1fr; }
}

/* =====  Tipografia di stampa  ===== */
@media print {
  .site-header, .site-footer, .exam-pagination, .exam-aside, .exam-back { display: none; }
  body { background: white; color: black; }
  .exam-article { max-width: 100%; }
  .quesito { break-inside: avoid; }
  .callout { break-inside: avoid; border-left-width: 2px; }
}

/* =====  Selection  ===== */
::selection {
  background: var(--aero);
  color: var(--paper);
}


/* ===== Figure tecniche importate dal sorgente TikZ ===== */
.block-figure {
  margin: var(--s-6) auto;
  padding: var(--s-4);
  max-width: min(100%, 980px);
  background: color-mix(in srgb, var(--paper-2) 88%, white 12%);
  border: 1px solid var(--rule-soft);
  border-radius: 18px;
  box-shadow: var(--shadow-1);
  overflow-x: auto;
  text-align: center;
}
.technical-figure {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
  background: #fff;
  border-radius: 12px;
}
.block-figure figcaption {
  max-width: 82ch;
  margin: var(--s-3) auto 0;
  font-size: 0.9rem;
  line-height: 1.45;
  color: var(--ink-3);
  text-align: left;
}
.katex { font-size: 1.02em; }


/* Colori tecnici richiamati nelle didascalie */
.color-word.blue { color: var(--aero); font-weight: 600; }
.color-word.red { color: var(--rust); font-weight: 600; }
.color-word.green { color: var(--emerald); font-weight: 600; }
.color-word.yellow { color: var(--amber); font-weight: 600; }


/* Indice generale degli argomenti */
.topics-section {
  margin-top: var(--s-7);
}

.topics-intro-card {
  background: linear-gradient(135deg, rgba(29, 53, 87, 0.07), rgba(69, 123, 157, 0.08));
  border: 1px solid rgba(29, 53, 87, 0.12);
  border-radius: 6px;
  padding: clamp(1.2rem, 3vw, 2rem);
  box-shadow: var(--shadow-1);
  margin-bottom: var(--s-5);
}

.topics-intro-card p {
  max-width: 78ch;
  margin-top: 0;
}

.topic-search-label {
  display: block;
  font-weight: 700;
  color: var(--aero);
  margin: 1rem 0 0.35rem;
}

.topic-search {
  width: 100%;
  max-width: 720px;
  border: 1px solid rgba(29, 53, 87, 0.22);
  border-radius: 999px;
  padding: 0.85rem 1.1rem;
  font: inherit;
  background: #fff;
  color: var(--ink);
  box-shadow: 0 8px 22px rgba(29, 53, 87, 0.08);
}

.topic-search:focus {
  outline: 3px solid rgba(69, 123, 157, 0.18);
  border-color: var(--aero-2);
}

.topic-search-hint {
  color: var(--ink-3);
  font-size: 0.95rem;
  margin: 0.65rem 0 0;
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: var(--s-4);
}

.topic-card {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 1.2rem;
  box-shadow: var(--shadow-1);
}

.topic-card h3 {
  margin: 0 0 0.9rem;
  font-size: 1.05rem;
  color: var(--aero);
}

.topic-links {
  display: grid;
  gap: 0.55rem;
}

.topic-link {
  display: grid;
  gap: 0.15rem;
  text-decoration: none;
  padding: 0.7rem 0.8rem;
  border-radius: calc(6px - 2px);
  border: 1px solid rgba(29, 53, 87, 0.08);
  background: rgba(248, 250, 252, 0.78);
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.topic-link:hover {
  transform: translateY(-1px);
  border-color: rgba(29, 53, 87, 0.22);
  background: #fff;
}

.topic-name {
  color: var(--ink);
  font-weight: 650;
  line-height: 1.35;
}

.topic-source {
  color: var(--ink-3);
  font-size: 0.84rem;
}

.topic-card.is-empty,
.topic-link.is-hidden {
  display: none;
}

/* Variante collassabile dell'indice generale degli argomenti */
.topics-accordion {
  border: 1px solid rgba(29, 53, 87, 0.13);
  border-radius: 6px;
  background: linear-gradient(135deg, rgba(29, 53, 87, 0.06), rgba(69, 123, 157, 0.08));
  box-shadow: var(--shadow-1);
  overflow: hidden;
}

.topics-summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
  padding: clamp(1.25rem, 3vw, 2rem);
}

.topics-summary::-webkit-details-marker {
  display: none;
}

.topics-summary:focus-visible {
  outline: 3px solid rgba(69, 123, 157, 0.28);
  outline-offset: -3px;
}

.topics-summary-text {
  max-width: 78ch;
}

.topics-summary-kicker {
  display: inline-block;
  margin-bottom: 0.35rem;
  color: var(--aero-2);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.topics-summary .section-title {
  margin-bottom: 0.35rem;
}

.topics-summary p {
  margin: 0;
  color: var(--ink-3);
}

.topics-summary-action {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid rgba(29, 53, 87, 0.18);
  background: rgba(255, 255, 255, 0.78);
  border-radius: 999px;
  padding: 0.65rem 1rem;
  color: var(--aero);
  font-weight: 800;
  box-shadow: 0 8px 20px rgba(29, 53, 87, 0.08);
}

.topics-summary-action::after {
  content: '+';
  display: inline-grid;
  place-items: center;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 999px;
  background: rgba(29, 53, 87, 0.09);
  font-size: 1.05rem;
  line-height: 1;
}

.topics-accordion[open] .topics-summary-action::after {
  content: '−';
}

.summary-close-label,
.topics-accordion[open] .summary-open-label {
  display: none;
}

.topics-accordion[open] .summary-close-label {
  display: inline;
}

.topics-panel {
  padding: 0 clamp(1.25rem, 3vw, 2rem) clamp(1.25rem, 3vw, 2rem);
}

.topics-panel .topics-intro-card {
  background: rgba(255, 255, 255, 0.76);
  margin-bottom: var(--s-4);
}

@media (max-width: 720px) {
  .topics-summary {
    align-items: flex-start;
    flex-direction: column;
  }

  .topics-summary-action {
    width: 100%;
    justify-content: space-between;
  }
}