:root {
  --primary: #1b3a5c;
  --accent: #c97b2e;
  --bg-light: #f6f4ef;
  --border: #ddd6c7;
  --text: #2b2b2b;
}
* { box-sizing: border-box; }
body {
  font-family: "Georgia", "Times New Roman", serif;
  color: var(--text);
  line-height: 1.65;
  margin: 0;
  background: #fff;
}
.wrapper { display: flex; max-width: 1200px; margin: 0 auto; }
nav.toc {
  width: 280px;
  flex-shrink: 0;
  background: var(--bg-light);
  padding: 28px 20px;
  position: sticky;
  top: 0;
  align-self: flex-start;
  height: 100vh;
  overflow-y: auto;
  border-right: 1px solid var(--border);
  font-family: Arial, Helvetica, sans-serif;
}
nav.toc h2 {
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
  margin-top: 0;
}
nav.toc ol {
  padding-left: 18px;
  font-size: 13.5px;
  margin: 0;
}
nav.toc li { margin-bottom: 9px; }
nav.toc a { color: var(--text); text-decoration: none; }
nav.toc a:hover { color: var(--accent); text-decoration: underline; }
nav.toc a.active { color: var(--accent); font-weight: bold; text-decoration: underline; }
main { flex: 1; padding: 40px 56px 80px; min-width: 0; }
.cover {
  border-bottom: 3px solid var(--primary);
  padding-bottom: 28px;
  margin-bottom: 40px;
}
.cover .tag {
  font-family: Arial, sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  font-size: 13px;
  font-weight: bold;
}
.cover h1 { font-size: 34px; color: var(--primary); margin: 10px 0 6px; }
.cover p.sub { font-family: Arial, sans-serif; color: #555; font-size: 14.5px; margin: 0; }
section { margin-bottom: 48px; }
section h2 {
  color: var(--primary);
  font-size: 23px;
  border-left: 5px solid var(--accent);
  padding-left: 14px;
  margin-top: 0;
}
section h3 { color: var(--primary); font-size: 17.5px; margin-top: 28px; }
section h4 { font-size: 15px; margin-bottom: 6px; }
p { margin: 10px 0; }
table { width: 100%; border-collapse: collapse; margin: 16px 0; font-family: Arial, sans-serif; font-size: 13.5px; }
th, td { border: 1px solid var(--border); padding: 9px 11px; text-align: left; vertical-align: top; }
th { background: var(--bg-light); color: var(--primary); font-weight: bold; }
tr:nth-child(even) td { background: #fbfaf7; }
.callout {
  background: var(--bg-light);
  border-left: 4px solid var(--primary);
  padding: 14px 18px;
  margin: 18px 0;
  font-family: Arial, sans-serif;
  font-size: 14px;
}
.callout.warn { border-left-color: var(--accent); }
.callout strong { color: var(--primary); }
.split { display: flex; gap: 20px; flex-wrap: wrap; margin: 18px 0; }
.split .box {
  flex: 1;
  min-width: 220px;
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px 18px;
  font-family: Arial, sans-serif;
  font-size: 13.5px;
}
.split .box h4 { color: var(--primary); margin-top: 0; }
ul, ol.std { padding-left: 22px; }
li { margin-bottom: 6px; }
.badge {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  font-family: Arial, sans-serif;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
  margin-left: 6px;
  vertical-align: middle;
}
footer {
  font-family: Arial, sans-serif;
  font-size: 12px;
  color: #888;
  border-top: 1px solid var(--border);
  padding-top: 16px;
  margin-top: 60px;
}
.glossary dt { font-weight: bold; color: var(--primary); margin-top: 10px; }
.glossary dd { margin: 2px 0 0 0; }
.exo {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px 20px;
  margin: 16px 0;
  background: #fff;
}
.exo .q-num {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  font-family: Arial, sans-serif;
  font-size: 12px;
  font-weight: bold;
  padding: 2px 9px;
  border-radius: 4px;
  margin-right: 8px;
}
.exo .q-type {
  font-family: Arial, sans-serif;
  font-size: 11px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.exo p.question { font-weight: bold; margin: 8px 0 6px; }
.exo ul.choices { list-style: none; padding-left: 4px; }
.exo ul.choices li { margin-bottom: 4px; font-family: Arial, sans-serif; font-size: 14px; }
details.corrige {
  margin-top: 10px;
  font-family: Arial, sans-serif;
  font-size: 13.5px;
}
details.corrige summary {
  cursor: pointer;
  color: var(--primary);
  font-weight: bold;
  list-style: none;
}
details.corrige summary::before { content: "▸ "; }
details.corrige[open] summary::before { content: "▾ "; }
details.corrige .reponse {
  background: var(--bg-light);
  border-left: 4px solid var(--accent);
  padding: 10px 14px;
  margin-top: 8px;
}
.exo-section-title {
  font-family: Arial, sans-serif;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #888;
  margin: 30px 0 4px;
}
.page-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 44px;
  font-family: Arial, sans-serif;
  font-size: 13.5px;
}
.page-nav a {
  color: var(--primary);
  text-decoration: none;
  border: 1px solid var(--border);
  padding: 9px 16px;
  border-radius: 5px;
}
.page-nav a:hover { background: var(--bg-light); }
.page-nav .spacer { flex: 1; }
@media (max-width: 900px) {
  .wrapper { flex-direction: column; }
  nav.toc { width: 100%; height: auto; position: relative; }
  main { padding: 28px 22px 60px; }
}
@media print {
  nav.toc { display: none; }
  .wrapper { display: block; }
}