:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #526178;
  --line: #d8e1ed;
  --blue: #2674ea;
  --blue-dark: #174fbd;
  --paper: #fff;
  --soft: #f4f7fb;
  --radius: 1.25rem;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); }
a { color: inherit; }
.shell { width: min(1180px, calc(100% - 2rem)); margin-inline: auto; }
.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 1rem; top: 1rem; z-index: 20; padding: .8rem 1rem; background: #fff; border-radius: .6rem; }

.academy-header { position: sticky; top: 0; z-index: 10; border-bottom: 1px solid var(--line); background: rgba(255,255,255,.96); backdrop-filter: blur(10px); }
.header-inner { min-height: 5.1rem; display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; }
.brand { display: inline-flex; align-items: center; gap: .75rem; text-decoration: none; }
.brand-mark { width: 2.7rem; height: 2.7rem; display: grid; place-items: center; border-radius: .8rem; color: #fff; background: var(--blue); font-size: 1.6rem; font-weight: 900; }
.brand strong, .brand small { display: block; }
.brand strong { font-size: 1.1rem; }
.brand small { color: var(--muted); font-size: .78rem; letter-spacing: .06em; text-transform: uppercase; }
.academy-header nav { display: flex; align-items: center; gap: 1rem; }
.academy-header nav > a:not(.button) { color: var(--muted); font-weight: 700; text-decoration: none; }

.button { min-height: 2.9rem; display: inline-flex; align-items: center; justify-content: center; gap: .35rem; padding: .75rem 1.05rem; border: 1px solid var(--blue); border-radius: .8rem; color: #fff; background: var(--blue); font-weight: 850; text-decoration: none; }
.button:hover, .button:focus-visible { background: var(--blue-dark); }
.button-secondary { color: var(--blue-dark); background: #fff; }
.button-light { color: var(--blue-dark); background: #fff; border-color: #fff; }
.button-ghost { color: #fff; background: transparent; border-color: rgba(255,255,255,.65); }

.academy-hero { padding: clamp(4.5rem, 9vw, 8rem) 0; background: radial-gradient(circle at 85% 20%, #dff0ff 0, transparent 34%), linear-gradient(135deg, #f7faff, #edf5ff); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(17rem, .6fr); align-items: center; gap: clamp(2rem, 7vw, 6rem); }
.eyebrow, .section-kicker { margin: 0 0 1rem; color: var(--blue-dark); font-weight: 900; font-size: .78rem; letter-spacing: .12em; text-transform: uppercase; }
h1 { max-width: 16ch; margin: 0; font-size: clamp(2.5rem, 6vw, 5.3rem); line-height: .98; letter-spacing: -.045em; }
.lead { max-width: 65ch; margin: 1.5rem 0 0; color: var(--muted); font-size: clamp(1.05rem, 1.7vw, 1.28rem); line-height: 1.6; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; margin-top: 1.8rem; }
.text-link { color: var(--blue-dark); font-weight: 800; text-underline-offset: .25rem; }
.hero-summary { display: grid; padding: 1.5rem; border: 1px solid rgba(38,116,234,.2); border-radius: var(--radius); background: rgba(255,255,255,.88); box-shadow: 0 24px 55px rgba(28,65,110,.13); }
.hero-summary span { margin-bottom: 1.5rem; color: var(--blue-dark); font-size: .8rem; font-weight: 900; text-transform: uppercase; letter-spacing: .08em; }
.hero-summary strong { padding-top: 1rem; border-top: 1px solid var(--line); font-size: 1.2rem; }
.hero-summary small { margin: .25rem 0 1rem; color: var(--muted); }

.academy-content, .academy-rules { padding: clamp(4rem, 8vw, 7rem) 0; }
.section-heading { display: grid; grid-template-columns: 1fr minmax(17rem, .7fr); gap: 2rem; align-items: end; margin-bottom: 2rem; }
h2 { margin: 0; font-size: clamp(2rem, 4vw, 3.5rem); line-height: 1.05; letter-spacing: -.035em; }
.section-heading > p { margin: 0; color: var(--muted); line-height: 1.6; }
.lab-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.25rem; }
.lab-card { padding: clamp(1.5rem, 4vw, 2.4rem); border: 1px solid var(--line); border-top: 5px solid var(--blue); border-radius: var(--radius); background: #fff; box-shadow: 0 16px 45px rgba(28,65,110,.08); }
.lab-card.leakage { border-top-color: #d64274; }
.lab-meta { display: flex; align-items: center; gap: .6rem; color: var(--muted); font-size: .82rem; }
.lab-meta span { width: 2.1rem; height: 2.1rem; display: grid; place-items: center; border-radius: 999px; color: #fff; background: var(--blue); font-weight: 900; }
.lab-card.leakage .lab-meta span { background: #d64274; }
.lab-meta small { margin-left: auto; }
.lab-card h3 { margin: 1.5rem 0 .8rem; font-size: clamp(1.5rem, 3vw, 2.1rem); }
.lab-card p, .lab-card li { color: var(--muted); line-height: 1.55; }
.lab-card ul { display: grid; gap: .45rem; padding-left: 1.25rem; margin: 1.25rem 0 1.7rem; }

.academy-rules { background: var(--soft); }
.rules-grid { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: clamp(2rem, 7vw, 6rem); }
.rule-list { display: grid; gap: .75rem; }
.rule-list p { margin: 0; padding: 1.1rem 1.2rem; border-left: 4px solid var(--blue); border-radius: .8rem; color: var(--muted); background: #fff; line-height: 1.55; }
.rule-list strong { color: var(--ink); }

.academy-cta { padding: clamp(4rem, 8vw, 7rem) 0; color: #fff; background: #173b75; }
.academy-cta h2 { max-width: 24ch; }
.academy-cta .section-kicker { color: #b9dcff; }
footer { padding: 1.5rem 0; color: var(--muted); border-top: 1px solid var(--line); font-size: .9rem; }
footer .shell { display: flex; flex-wrap: wrap; gap: 1rem 1.5rem; }
footer span { margin-right: auto; }

@media (max-width: 850px) {
  .academy-header nav > a:not(.button), .academy-header .button-secondary { display: none; }
  .hero-grid, .section-heading, .rules-grid { grid-template-columns: 1fr; }
  .hero-summary { max-width: 30rem; }
}

@media (max-width: 640px) {
  .shell { width: min(100% - 1.25rem, 1180px); }
  .header-inner { min-height: 4.4rem; }
  .brand small { display: none; }
  .academy-header .button { min-height: 44px; padding: .65rem .8rem; font-size: .84rem; }
  .academy-hero { padding-top: 3.5rem; }
  .lab-grid { grid-template-columns: 1fr; }
  .lab-card .button { width: 100%; text-align: center; }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .hero-actions .button, .hero-actions .text-link { width: 100%; text-align: center; }
}
/* CB-CHG-20260918-164 : liens du pied de page en cibles tactiles de 44 px. */
@media (max-width: 760px) { footer a { display: inline-flex; align-items: center; min-height: 44px; } }