:root {
  --ink: #1d2733;
  --mut: #5f6b7a;
  --bg: #fff;
  --soft: #f3f5f8;
  --line: #dde2e8;
  --accent: #2f5fb3;
  --ok: #0f7a5f;
  --mid: #b45309;
  --bad: #b91c1c;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e8edf3;
    --mut: #9aa6b4;
    --bg: #1b222b;
    --soft: #242d38;
    --line: #323c48;
    --accent: #7aa2e8;
    --ok: #34d399;
    --mid: #fbbf24;
    --bad: #f87171;
  }
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 system-ui, "Segoe UI", sans-serif;
  -webkit-text-size-adjust: 100%;
}
header,
main,
footer {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 16px;
}
header {
  padding-top: 24px;
}
h1 {
  font-size: 28px;
  line-height: 1.2;
  margin: 12px 0 6px;
}
h2 {
  font-size: 21px;
  margin: 40px 0 10px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}
h3 {
  font-size: 16.5px;
  margin: 22px 0 6px;
}
.sub {
  color: var(--mut);
  margin: 0 0 14px;
}
nav {
  font-size: 14px;
  line-height: 1.9;
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--soft);
}
a {
  color: var(--accent);
}
.back {
  font-weight: 600;
  text-decoration: none;
}
footer {
  padding: 32px 16px 40px;
}
ul,
ol {
  padding-left: 22px;
}
li + li {
  margin-top: 6px;
}
ul.key li {
  margin-top: 8px;
}
.mut,
small {
  color: var(--mut);
}
.mut {
  font-size: 14px;
}
code {
  font-size: 14px;
  background: var(--soft);
  padding: 1px 5px;
  border-radius: 4px;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin: 8px 0;
  font-variant-numeric: tabular-nums;
}
th,
td {
  text-align: left;
  vertical-align: top;
  padding: 6px 8px 6px 0;
  border-bottom: 1px solid var(--line);
}
th {
  font-weight: 600;
  color: var(--mut);
}
.ok {
  color: var(--ok);
  font-weight: 600;
}
.mid {
  color: var(--mid);
  font-weight: 600;
}
.bad {
  color: var(--bad);
  font-weight: 600;
}
/* schéma des étapes du modèle */
ol.flow {
  list-style: none;
  counter-reset: step;
  display: flex;
  gap: 8px;
  padding: 0;
  margin: 14px 0 6px;
}
ol.flow li {
  counter-increment: step;
  position: relative;
  flex: 1;
  margin: 0;
  padding: 10px 10px 10px;
  border-radius: 10px;
  background: var(--soft);
  border-top: 4px solid var(--accent);
  font-size: 14px;
  line-height: 1.35;
}
ol.flow li b::before {
  content: counter(step) ". ";
}
ol.flow li span {
  display: block;
  margin-top: 4px;
  color: var(--mut);
  font-size: 13px;
}
ol.flow li + li::before {
  content: "→";
  position: absolute;
  left: -9px;
  top: 50%;
  transform: translate(-50%, -50%);
  color: var(--mut);
  font-weight: 700;
}
.kpis {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin: 12px 0;
}
.kpis div {
  padding: 10px;
  border-radius: 10px;
  background: var(--soft);
  font-size: 13px;
  line-height: 1.35;
  color: var(--mut);
}
.kpis b {
  display: block;
  font-size: 22px;
  color: var(--ink);
  margin-bottom: 4px;
}
details {
  margin: 8px 0;
  padding: 8px 12px;
  border-radius: 10px;
  background: var(--soft);
}
summary {
  cursor: pointer;
  font-weight: 600;
}
details p {
  margin: 8px 0 2px;
}
@media (max-width: 640px) {
  body {
    font-size: 15.5px;
  }
  h1 {
    font-size: 24px;
  }
  ol.flow {
    flex-direction: column;
  }
  ol.flow li + li::before {
    content: "↓";
    left: 50%;
    top: -9px;
  }
  .kpis {
    grid-template-columns: repeat(2, 1fr);
  }
  table {
    font-size: 13px;
  }
}
@media print {
  nav,
  .back {
    display: none;
  }
  details {
    background: none;
  }
}