/* bailweb976 — design system autonome (pas de framework), mobile-first, léger */

:root {
  --bg: #f6f7fb;
  --fg: #101728;
  --brand: #1d4ed8;
  --brand-dark: #17399e;
  --brand-light: #e8edfc;
  --accent: #e07a1c;
  --accent-dark: #b85e0f;
  --card: #ffffff;
  --border: #dfe3ee;
  --muted: #5b6478;
  --ok: #17803d;
  --warn: #b8860b;
  --radius: 0.9rem;
  --maxw: 1120px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0f18;
    --fg: #eef1fa;
    --brand: #6f93ff;
    --brand-dark: #4c6fe0;
    --brand-light: #16203f;
    --accent: #f0964a;
    --accent-dark: #d97b2c;
    --card: #131826;
    --border: #262c40;
    --muted: #a3aac2;
    --ok: #4ade80;
    --warn: #facc15;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.55;
  font-size: 17px;
}

img, svg { max-width: 100%; height: auto; }

a { color: var(--brand); }
a:hover { color: var(--brand-dark); }

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.1rem;
}

/* ---------- header / nav ---------- */
header.site {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
header.site .bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.7rem 0;
}
.brand-logo {
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--fg);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.brand-logo .dot { color: var(--accent); }

nav.main { display: none; gap: 1.1rem; align-items: center; }
nav.main a {
  color: var(--fg);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
}
nav.main a.active, nav.main a:hover { color: var(--brand); }

#navToggle {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 0.6rem;
  min-width: 44px;
  min-height: 44px;
  font-size: 1.2rem;
}
#mobileNav {
  display: none;
  flex-direction: column;
  gap: 0.1rem;
  padding: 0.5rem 0 1rem;
  border-top: 1px solid var(--border);
}
#mobileNav.open { display: flex; }
#mobileNav a {
  padding: 0.7rem 0.2rem;
  text-decoration: none;
  color: var(--fg);
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  min-height: 44px;
  display: flex;
  align-items: center;
}

@media (min-width: 860px) {
  nav.main { display: flex; }
  #navToggle { display: none; }
  #mobileNav { display: none !important; }
}

/* ---------- hero / sections ---------- */
main { display: block; }
section { padding: 2.6rem 0; }
section.tight { padding: 1.6rem 0; }

.hero {
  background: linear-gradient(160deg, var(--brand-light), var(--bg) 70%);
  padding: 2.6rem 0 3rem;
}
.eyebrow {
  display: inline-block;
  background: var(--brand-light);
  color: var(--brand-dark);
  font-weight: 700;
  font-size: 0.82rem;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  margin-bottom: 0.9rem;
}
h1 { font-size: 2rem; line-height: 1.18; margin: 0 0 0.9rem; letter-spacing: -0.01em; }
h2 { font-size: 1.5rem; margin: 0 0 0.8rem; letter-spacing: -0.01em; }
h3 { font-size: 1.15rem; margin: 1.3rem 0 0.5rem; }
p.lead { font-size: 1.08rem; color: var(--muted); margin: 0 0 1.3rem; }

@media (min-width: 700px) {
  h1 { font-size: 2.6rem; }
  h2 { font-size: 1.9rem; }
  body { font-size: 18px; }
}

.cta-row { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 1.2rem; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 46px;
  padding: 0.7rem 1.2rem;
  border-radius: 0.7rem;
  font-weight: 700;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  font-size: 0.98rem;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); color: #fff; }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-dark); color: #fff; }
.btn-ghost { background: transparent; border-color: var(--border); color: var(--fg); }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }

/* ---------- cards / grid ---------- */
.grid { display: grid; gap: 1rem; grid-template-columns: 1fr; }
@media (min-width: 640px) { .grid.cols-2 { grid-template-columns: 1fr 1fr; } }
@media (min-width: 860px) { .grid.cols-3 { grid-template-columns: repeat(3, 1fr); } .grid.cols-4 { grid-template-columns: repeat(4, 1fr); } }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}
.card h3 { margin-top: 0; }
.card .num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 2.1rem; height: 2.1rem; border-radius: 50%;
  background: var(--brand-light); color: var(--brand-dark);
  font-weight: 800; margin-bottom: 0.6rem;
}

.badge {
  display: inline-block;
  font-size: 0.76rem;
  font-weight: 700;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: var(--brand-light);
  color: var(--brand-dark);
}
.badge.accent { background: #fbe6d2; color: var(--accent-dark); }

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; min-width: 560px; }
th, td { text-align: left; padding: 0.6rem 0.8rem; border-bottom: 1px solid var(--border); font-size: 0.94rem; }
thead th { background: var(--brand-light); color: var(--brand-dark); position: sticky; top: 0; }
tr:last-child td { border-bottom: none; }

/* ---------- Feynman module blocks ---------- */
.feynman-block {
  border: 1px solid var(--border);
  border-left: 4px solid var(--brand);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  margin: 1rem 0;
  background: var(--card);
}
.feynman-block.analogie { border-left-color: var(--accent); }
.feynman-block.erreur { border-left-color: #d64545; }
.feynman-block.action { border-left-color: var(--ok); }
.feynman-block h4 {
  margin: 0 0 0.5rem;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

details.correction {
  border: 1px dashed var(--border);
  border-radius: 0.6rem;
  padding: 0.7rem 0.9rem;
  margin: 0.7rem 0;
  background: var(--brand-light);
}
details.correction summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--brand-dark);
  min-height: 30px;
}

.recap-q { display: flex; gap: 0.6rem; align-items: flex-start; padding: 0.5rem 0; border-bottom: 1px solid var(--border); }
.recap-q:last-child { border-bottom: none; }
.recap-q input[type="checkbox"] { min-width: 22px; min-height: 22px; margin-top: 0.15rem; }

.revise-tag {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-size: 0.85rem; font-weight: 700; color: var(--warn);
  background: rgba(184,134,11,0.12);
  padding: 0.35rem 0.7rem; border-radius: 0.6rem;
}

/* ---------- module nav / progress ---------- */
.module-progress {
  display: flex; align-items: center; gap: 0.6rem;
  font-size: 0.85rem; color: var(--muted); margin-bottom: 1rem;
}
.progress-bar { flex: 1; height: 8px; background: var(--border); border-radius: 999px; overflow: hidden; }
.progress-bar > span { display: block; height: 100%; background: var(--brand); border-radius: 999px; transition: width 0.3s; }

.module-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.6rem; }
.module-list a {
  display: flex; align-items: center; gap: 0.8rem;
  padding: 0.9rem 1rem; border: 1px solid var(--border); border-radius: var(--radius);
  text-decoration: none; color: var(--fg); background: var(--card);
}
.module-list a:hover { border-color: var(--brand); }
.module-list .mchk {
  min-width: 26px; height: 26px; border-radius: 50%;
  border: 2px solid var(--border); display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem; font-weight: 800; color: var(--muted); flex-shrink: 0;
}
.module-list a[data-done="true"] .mchk { background: var(--ok); border-color: var(--ok); color: #fff; }
.module-list .mtitle { flex: 1; }
.module-list .mtitle small { display: block; color: var(--muted); font-weight: 400; }

.pager { display: flex; justify-content: space-between; gap: 0.8rem; margin: 2rem 0 0; flex-wrap: wrap; }

/* ---------- checklist (plan / planning) ---------- */
.checklist { list-style: none; margin: 0; padding: 0; }
.checklist li {
  display: flex; gap: 0.7rem; align-items: flex-start;
  padding: 0.6rem 0.2rem; border-bottom: 1px solid var(--border);
}
.checklist li:last-child { border-bottom: none; }
.checklist input[type="checkbox"] { min-width: 22px; min-height: 22px; margin-top: 0.1rem; }
.checklist label.done { text-decoration: line-through; color: var(--muted); }

/* ---------- calculators ---------- */
.calc-field { margin-bottom: 0.9rem; }
.calc-field label { display: block; font-weight: 700; font-size: 0.9rem; margin-bottom: 0.3rem; }
.calc-field input {
  width: 100%; padding: 0.6rem 0.7rem; border: 1px solid var(--border); border-radius: 0.6rem;
  font-size: 1rem; background: var(--card); color: var(--fg); min-height: 44px;
}
.calc-result {
  background: var(--brand-light); border-radius: var(--radius); padding: 1rem;
  font-size: 1.05rem; margin-top: 1rem;
}
.calc-result .big { font-size: 1.7rem; font-weight: 800; color: var(--brand-dark); }

/* ---------- footer ---------- */
footer.site { border-top: 1px solid var(--border); padding: 2.4rem 0; margin-top: 2rem; color: var(--muted); font-size: 0.9rem; }
footer.site a { color: var(--muted); }
footer.site .cols { display: grid; gap: 1.4rem; grid-template-columns: 1fr; margin-bottom: 1.4rem; }
@media (min-width: 700px) { footer.site .cols { grid-template-columns: 2fr 1fr 1fr; } }
footer.site h4 { color: var(--fg); font-size: 0.95rem; margin: 0 0 0.6rem; }
footer.site ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.4rem; }

/* ---------- utility ---------- */
.muted { color: var(--muted); }
.center { text-align: center; }
.mt-0 { margin-top: 0; }
.small { font-size: 0.87rem; }
.disclaimer {
  background: var(--brand-light); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 0.9rem 1.1rem; font-size: 0.88rem; color: var(--muted);
  margin: 1.2rem 0;
}
.toc { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.2rem; }
.toc a { text-decoration: none; }

/* ---------- contenu markdown converti (prose) ---------- */
.prose { max-width: 78ch; }
.prose ul, .prose ol { padding-left: 1.3rem; margin: 0.7rem 0; }
.prose li { margin: 0.3rem 0; }
.prose hr { border: none; border-top: 1px solid var(--border); margin: 2rem 0; }
.prose blockquote {
  border-left: 4px solid var(--accent);
  margin: 1rem 0; padding: 0.6rem 1rem;
  background: var(--brand-light); border-radius: 0 0.6rem 0.6rem 0;
  color: var(--muted);
}
.prose table { min-width: 640px; }
.prose h2 { margin-top: 2.2rem; padding-top: 0.6rem; border-top: 1px solid var(--border); }
.prose h2:first-child { border-top: none; margin-top: 0; padding-top: 0; }
.prose h3 { margin-top: 1.4rem; }
.prose strong { color: var(--fg); }
.prose code {
  background: var(--brand-light); color: var(--brand-dark);
  padding: 0.1rem 0.35rem; border-radius: 0.35rem; font-size: 0.9em;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}