:root {
      --ink: #1B1D26;
      --pcb: #1E2130;
      --pcb-dark: #16181F;
      --copper: #D8284F;
      --copper-dark: #B91F41;
      --paper: #F5F6F8;
      --line: #DADDE4;
      --mute: #565B6B;
      --bs-body-font-family: "Source Sans 3", system-ui, sans-serif;
      --bs-body-color: var(--ink);
}
    
body { background: var(--paper); font-size: 1.08rem; line-height: 1.6; }
    
h1, h2, h3, .brand { font-family: "Bricolage Grotesque", "Source Sans 3", sans-serif; letter-spacing: -0.01em; }
    
a:focus-visible, button:focus-visible { outline: 3px solid var(--copper); outline-offset: 3px; }

/* Navigation */
.site-nav { background: var(--pcb-dark); border-bottom: 3px solid var(--copper); }
.brand { display: inline-flex; align-items: center; }
.brand img { height: 42px; width: auto; display: block; }
.site-nav .nav-link { color: #fff; font-weight: 600; }
.site-nav .nav-link:hover { color: #FF8FA8; }

/* Boutons */
.btn-copper { background: var(--copper); border-color: var(--copper); color: #fff; font-weight: 600; }
.btn-copper:hover, .btn-copper:focus { background: var(--copper-dark); border-color: var(--copper-dark); color: #fff; }
.btn-line { border: 2px solid var(--pcb); color: var(--pcb); font-weight: 600; background: transparent; }
.btn-line:hover { background: var(--pcb); color: #fff; }

/* Hero : grille de trous façon plaque d’essai */
.hero {
  background-color: var(--paper);
  background-image: radial-gradient(circle, #C6CAD4 1.4px, transparent 1.6px);
  background-size: 22px 22px;
  padding: 4.5rem 0 5rem;
  border-bottom: 1px solid var(--line);
}

.hero h1 { font-weight: 800; font-size: clamp(2.2rem, 5vw, 3.5rem); line-height: 1.08; color: var(--pcb-dark); max-width: 14ch; }
.hero .lead { max-width: 52ch; color: var(--mute); font-size: 1.2rem; }

/* Maquette de la séance (illustration) */
.session { background: #fff; border: 2px solid var(--pcb); border-radius: 14px; box-shadow: 8px 8px 0 var(--copper); overflow: hidden; }
.session-head { background: var(--pcb); color: #fff; padding: .75rem 1.1rem; font-weight: 600; display: flex; justify-content: space-between; align-items: center; }
.session-row { display: flex; align-items: center; gap: .9rem; padding: .95rem 1.1rem; border-top: 1px solid var(--line); }
.session-row:first-of-type { border-top: 0; }
.session-row .title { flex: 1; font-weight: 600; }
.session-row .meta { display: block; font-weight: 400; font-size: .9rem; color: var(--mute); }
.state { font-size: .85rem; font-weight: 600; padding: .2rem .6rem; border-radius: 999px; white-space: nowrap; }
.state-open { background: #DDF1E6; color: #11603B; }
.state-locked { background: #ECEFED; color: #4A5551; }
.row-locked { background: #F7F9F8; }
.row-locked .title { color: #6A7772; }
.ico { width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center; font-size: 1.15rem; background: #FBE6EB; color: var(--copper); flex: none; }
.row-locked .ico { background: #ECEFED; color: #78847F; }
.code-hint { font-family: "JetBrains Mono", monospace; font-size: .85rem; background: #F1F2F5; padding: .75rem 1.1rem; border-top: 1px solid var(--line); color: var(--pcb-dark); }

/* Sections */
.section { padding: 4.5rem 0; }
.section h2 { font-weight: 800; font-size: clamp(1.7rem, 3.5vw, 2.3rem); color: var(--pcb-dark); }
.section .intro { max-width: 60ch; color: var(--mute); }

.point { display: flex; gap: 1rem; padding: 1.25rem 0; border-top: 1px solid var(--line); }
.point:first-child { border-top: 0; padding-top: 0; }
.point .ico { width: 46px; height: 46px; font-size: 1.3rem; }
.point h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: .25rem; }
.point p { margin: 0; color: var(--mute); }

/* Niveaux */
.levels { background: var(--pcb-dark); color: #fff; }
.levels h2 { color: #fff; }

.level {
  border: 1px solid rgba(255,255,255,.28);
  border-radius: 14px;
  padding: 1.75rem;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.level .tag { display: inline-flex; align-items: center; gap: .5rem; background: var(--copper); color: #fff; font-weight: 600; font-size: .95rem; padding: .25rem .75rem; border-radius: 999px; }
.level h3 { font-size: 1.5rem; font-weight: 700; margin: 1rem 0 .4rem; }
.level p { color: #C9CDD9; }
.level ul { list-style: none; padding: 0; margin: 1.2rem 0 1.5rem; }
.level li { padding: .55rem 0; border-top: 1px solid rgba(255,255,255,.18); display: flex; gap: .7rem; align-items: center; }
.level li i { color: var(--copper); }
.level-action { margin-top: auto; }

.btn-level {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  width: 100%;
  padding: .75rem 1.25rem;
  border-radius: .5rem;
  border: 2px solid var(--copper);
  background: var(--copper);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  transition: background-color .15s, color .15s, border-color .15s;
}
.btn-level:hover { background: #fff; border-color: #fff; color: var(--pcb-dark); }
.btn-level:focus-visible { outline: 3px solid #fff; outline-offset: 3px; }

/* Fonctionnement */
.steps { list-style: none; padding: 0; margin: 0; counter-reset: step; }
.steps li { counter-increment: step; display: flex; gap: 1.1rem; padding: 1.1rem 0; border-top: 1px solid var(--line); }
.steps li:first-child { border-top: 0; }
.steps li::before { content: counter(step); flex: none; width: 38px; height: 38px; border-radius: 50%; background: var(--copper); color: #fff; font-family: "Bricolage Grotesque", sans-serif; font-weight: 700; display: grid; place-items: center; }
.steps strong { display: block; font-size: 1.1rem; }
.steps span { color: var(--mute); }

/* Appel final */
.cta { background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 3.5rem 0; }

footer { background: var(--pcb-dark); padding: 2rem 0; color: #AEB3C2; font-size: .95rem; }
footer a { color: #fff; font-weight: 600; }
footer img { height: 34px; width: auto; }