/* =========================================================================
   Prep-Stage-Kruger — feuille de style partagée
   Objectif : lisibilité maximale (document d'études), navigation cohérente,
   encadrés reconnaissables, responsive, mode sombre automatique.
   Aucune dépendance externe (fonctionne hors-ligne).
   ========================================================================= */

:root {
  /* Palette — accent vert/sarcelle inspiré du logo Kruger */
  --accent: #00857a;
  --accent-strong: #006a61;
  --accent-soft: #e3f4f2;

  --bg: #f7f8f8;
  --surface: #ffffff;
  --surface-2: #f0f2f2;
  --text: #1c2222;
  --text-soft: #4b5757;
  --border: #dde3e3;

  /* Couleurs des encadrés */
  --dev: #5b6cff;          /* analogie dev */
  --dev-bg: #eef0ff;
  --vocab: #8a5cf6;        /* vocabulaire */
  --vocab-bg: #f3edff;
  --kruger: #00857a;       /* au stage */
  --kruger-bg: #e3f4f2;
  --warn: #d97706;         /* piège */
  --warn-bg: #fdf2e3;
  --link: #0a7d36;         /* pour aller plus loin */
  --link-bg: #e9f7ee;

  --maxw: 78ch;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0, 0, 0, .06), 0 6px 18px rgba(0, 0, 0, .04);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "Cascadia Code", "Fira Code", Consolas, "SF Mono", Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111514;
    --surface: #1a201f;
    --surface-2: #232b2a;
    --text: #e8edec;
    --text-soft: #aab5b3;
    --border: #2e3837;
    --accent: #2bb3a6;
    --accent-strong: #45c7ba;
    --accent-soft: #14302d;

    --dev-bg: #1c2140;
    --vocab-bg: #271c3d;
    --kruger-bg: #0f2f2c;
    --warn-bg: #33260f;
    --link-bg: #0f2a1a;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

/* ------------------------------------------------------------------ Layout */
.layout { display: flex; min-height: 100vh; }

.sidebar {
  width: 290px;
  flex: 0 0 290px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.sidebar .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 20px 14px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--surface);
  z-index: 2;
}
.sidebar .brand .logo {
  width: 34px; height: 34px; border-radius: 8px;
  background: var(--accent); color: #fff;
  display: grid; place-items: center; font-weight: 800; font-size: 18px;
  flex: 0 0 auto;
}
.sidebar .brand .titles { line-height: 1.25; }
.sidebar .brand .titles strong { display: block; font-size: 15px; }
.sidebar .brand .titles span { font-size: 12px; color: var(--text-soft); }

.sidebar nav { padding: 12px 12px 40px; }
.sidebar .nav-group {
  font-size: 11px; text-transform: uppercase; letter-spacing: .07em;
  color: var(--text-soft); font-weight: 700;
  padding: 14px 10px 6px;
}
.sidebar nav a {
  display: flex; align-items: center; gap: 9px;
  padding: 8px 10px; border-radius: 8px;
  color: var(--text-soft); text-decoration: none; font-size: 14.5px;
  line-height: 1.3;
}
.sidebar nav a .num {
  font-variant-numeric: tabular-nums; font-size: 12px;
  color: var(--accent); font-weight: 700; min-width: 18px;
}
.sidebar nav a:hover { background: var(--surface-2); color: var(--text); }
.sidebar nav a.active {
  background: var(--accent-soft); color: var(--accent-strong); font-weight: 600;
}
.sidebar nav a.active .num { color: var(--accent-strong); }

/* ------------------------------------------------------------------ Content */
.content { flex: 1 1 auto; min-width: 0; padding: 0 28px 90px; }
.content-inner { max-width: var(--maxw); margin: 0 auto; }

.topbar {
  display: none;
  align-items: center; gap: 12px;
  position: sticky; top: 0; z-index: 5;
  background: var(--surface); border-bottom: 1px solid var(--border);
  padding: 10px 14px; margin: 0 -28px 0;
}
.topbar button {
  font-size: 22px; line-height: 1; background: none; border: 1px solid var(--border);
  border-radius: 8px; padding: 4px 10px; cursor: pointer; color: var(--text);
}
.topbar strong { font-size: 15px; }

/* En-tête de page */
.page-head {
  padding: 40px 0 8px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 28px;
}
.eyebrow {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--accent-strong);
  background: var(--accent-soft); padding: 4px 10px; border-radius: 999px;
  margin-bottom: 14px;
}
h1 { font-size: 2.1rem; line-height: 1.2; margin: 0 0 10px; letter-spacing: -.01em; }
.lede { font-size: 1.12rem; color: var(--text-soft); margin: 0; }

h2 {
  font-size: 1.5rem; margin: 44px 0 12px; line-height: 1.25;
  padding-top: 8px; letter-spacing: -.01em;
}
h3 { font-size: 1.18rem; margin: 28px 0 8px; }
p { margin: 0 0 16px; }
a { color: var(--accent-strong); text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent); }
ul, ol { margin: 0 0 16px; padding-left: 22px; }
li { margin: 6px 0; }
strong { color: var(--text); }
hr { border: none; border-top: 1px solid var(--border); margin: 36px 0; }

code {
  font-family: var(--mono); font-size: .88em;
  background: var(--surface-2); padding: .12em .4em; border-radius: 5px;
  border: 1px solid var(--border);
}
pre {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 16px; overflow-x: auto;
}
pre code { background: none; border: none; padding: 0; }

/* ------------------------------------------------------------------ Callouts */
.callout {
  border: 1px solid var(--border);
  border-left: 4px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin: 20px 0;
  box-shadow: var(--shadow);
}
.callout .c-title {
  font-weight: 700; font-size: .82rem; text-transform: uppercase;
  letter-spacing: .05em; display: flex; align-items: center; gap: 8px;
  margin-bottom: 6px;
}
.callout p:last-child, .callout ul:last-child, .callout ol:last-child { margin-bottom: 0; }
.callout .c-title .ico { font-size: 1.05rem; }

.callout.dev    { border-left-color: var(--dev);    background: var(--dev-bg); }
.callout.dev .c-title    { color: var(--dev); }
.callout.vocab  { border-left-color: var(--vocab);  background: var(--vocab-bg); }
.callout.vocab .c-title  { color: var(--vocab); }
.callout.kruger { border-left-color: var(--kruger); background: var(--kruger-bg); }
.callout.kruger .c-title { color: var(--accent-strong); }
.callout.warn   { border-left-color: var(--warn);   background: var(--warn-bg); }
.callout.warn .c-title   { color: var(--warn); }
.callout.more   { border-left-color: var(--link);   background: var(--link-bg); }
.callout.more .c-title   { color: var(--link); }

/* ------------------------------------------------------------------ Tables */
.table-wrap { overflow-x: auto; margin: 20px 0; border-radius: var(--radius); }
table {
  width: 100%; border-collapse: collapse; font-size: 15px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden;
}
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { background: var(--surface-2); font-size: 13px; text-transform: uppercase; letter-spacing: .03em; color: var(--text-soft); }
tr:last-child td { border-bottom: none; }
td code { white-space: nowrap; }

/* ------------------------------------------------------------------ Cards & misc */
.card-grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); margin: 22px 0; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; box-shadow: var(--shadow); text-decoration: none; color: inherit; display: block;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); transition: .15s; }
.card .k { font-size: 12px; font-weight: 700; color: var(--accent-strong); text-transform: uppercase; letter-spacing: .05em; }
.card h3 { margin: 6px 0 6px; font-size: 1.05rem; }
.card p { font-size: 14px; color: var(--text-soft); margin: 0; }

.tag {
  display: inline-block; font-size: 12px; font-weight: 600;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 999px; padding: 2px 10px; margin: 0 4px 4px 0; color: var(--text-soft);
}

.tldr {
  background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-radius: var(--radius); padding: 16px 20px; margin: 0 0 28px;
}
.tldr .c-title { font-weight: 800; color: var(--accent-strong); margin-bottom: 6px; }

/* Schéma "grande image" */
.flow { display: flex; flex-wrap: wrap; align-items: stretch; gap: 10px; margin: 24px 0; }
.flow .node {
  flex: 1 1 150px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 12px 14px; box-shadow: var(--shadow);
}
.flow .node .lvl { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; color: var(--text-soft); }
.flow .node.ot  { border-top: 3px solid #d97706; }
.flow .node.it  { border-top: 3px solid var(--accent); }
.flow .node.dec { border-top: 3px solid var(--vocab); }
.flow .arrow { align-self: center; color: var(--text-soft); font-size: 22px; }

.footnav {
  display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap;
  margin-top: 50px; padding-top: 22px; border-top: 1px solid var(--border);
}
.footnav a {
  text-decoration: none; padding: 12px 16px; border: 1px solid var(--border);
  border-radius: var(--radius); background: var(--surface); flex: 1 1 220px; min-width: 0;
}
.footnav a:hover { border-color: var(--accent); }
.footnav .dir { font-size: 12px; color: var(--text-soft); }
.footnav .ttl { font-weight: 600; }
.footnav .next { text-align: right; }

.checklist { list-style: none; padding-left: 0; }
.checklist li { display: flex; gap: 10px; align-items: flex-start; padding: 6px 0; }
.checklist li::before { content: "☐"; color: var(--accent); font-size: 1.1rem; line-height: 1.5; }

.backdrop { display: none; }

/* ------------------------------------------------------------------ Responsive */
@media (max-width: 880px) {
  .sidebar {
    position: fixed; left: 0; top: 0; z-index: 50;
    transform: translateX(-100%); transition: transform .2s ease;
    box-shadow: var(--shadow);
  }
  body.nav-open .sidebar { transform: translateX(0); }
  body.nav-open .backdrop {
    display: block; position: fixed; inset: 0; background: rgba(0,0,0,.4); z-index: 40;
  }
  .topbar { display: flex; }
  .content { padding: 0 18px 70px; }
  .page-head { padding-top: 24px; }
  h1 { font-size: 1.7rem; }
}

@media print {
  .sidebar, .topbar, .footnav { display: none; }
  .content { padding: 0; }
  .callout, .card { box-shadow: none; }
}