/* ═══════════════════════════════════════════════════════
   RESET & VARIABLES
═══════════════════════════════════════════════════════ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --yellow:       #e0e800;
  --yellow-dark:  #c5ce00;
  --yellow-pale:  #f8fac0;
  --slate:        #798e91;
  --slate-dark:   #5c6f72;
  --slate-darker: #3d4f52;
  --slate-pale:   #dce6e7;
  --slate-bg:     #eef2f3;
  --dark:         #1a1a2e;
  --text:         #4a5568;
  --border:       #e5e7eb;
  --white:        #ffffff;
  --font:         'Nunito', sans-serif;
  --script:       'Dancing Script', cursive;
  --nav-h:        72px;
  --max-w:        1140px;
}

html  { scroll-behavior: smooth; }
body  {
  font-family: var(--font);
  background: #fff;
  color: var(--dark);
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }

/* Scrollbar */
::-webkit-scrollbar       { width: 6px; }
::-webkit-scrollbar-track { background: #f1f1f1; }
::-webkit-scrollbar-thumb { background: var(--slate-pale); border-radius: 3px; }

/* Selection */
::selection { background: var(--yellow); color: var(--dark); }


/* ═══════════════════════════════════════════════════════
   NAVIGATION
═══════════════════════════════════════════════════════ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 40px;
  background: rgba(255, 255, 255, 0);
  transition: background 0.3s, box-shadow 0.3s, backdrop-filter 0.3s;
}
.nav.scrolled {
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(0,0,0,0.06), 0 4px 24px rgba(0,0,0,0.04);
}

/* Logo */
.nav-logo {
  display: flex; align-items: center; flex-shrink: 0;
}
.nav-logo img {
  height: 38px; object-fit: contain; display: block;
}
/* Logo par défaut : filtre SVG #logo-no-bg rend les pixels blancs
   transparents directement dans l'image — aucun blend-mode requis */
.nav-logo .logo-default {
  filter: url(#logo-no-bg);
}
/* Logo blanc transparent (pour héros sombres) : caché par défaut */
.nav-logo .logo-white { display: none; }

/* ── Variante hero sombre (formation, démo) ───────────────── */
.nav.nav-dark-hero:not(.scrolled) .logo-default { display: none; }
.nav.nav-dark-hero:not(.scrolled) .logo-white   { display: block; }
.nav.nav-dark-hero:not(.scrolled) .nav-link      { color: rgba(255,255,255,0.82); }
.nav.nav-dark-hero:not(.scrolled) .nav-link:hover {
  color: #fff; background: rgba(255,255,255,0.1);
}
.nav.nav-dark-hero:not(.scrolled) .nav-link.active {
  color: #fff; background: rgba(255,255,255,0.15);
}
.nav.nav-dark-hero:not(.scrolled) .nav-link.coach-ia {
  color: var(--yellow);
  background: rgba(224,232,0,0.15);
  border-color: rgba(224,232,0,0.3);
}
.nav.nav-dark-hero:not(.scrolled) .nav-link.coach-ia:hover {
  background: rgba(224,232,0,0.25); color: var(--yellow);
}
.nav.nav-dark-hero:not(.scrolled) .nav-burger span { background: #fff; }

/* Links */
.nav-links {
  display: flex; align-items: center; gap: 4px;
}
.nav-link {
  font-family: var(--font); font-weight: 700; font-size: 14px;
  color: var(--text); padding: 8px 14px; border-radius: 8px;
  transition: color 0.15s, background 0.15s;
  white-space: nowrap;
}
.nav-link:hover  { color: var(--dark); background: var(--slate-bg); }
.nav-link.active { color: var(--dark); background: var(--yellow-pale); }
.nav-link.coach-ia {
  color: var(--slate-dark); background: var(--yellow-pale);
  border: 1px solid rgba(224,232,0,0.5);
}
.nav-link.coach-ia:hover { background: var(--yellow); color: var(--dark); }

/* CTA button */
.nav-cta {
  background: var(--yellow); color: var(--dark);
  font-family: var(--font); font-weight: 800; font-size: 14px;
  padding: 10px 22px; border-radius: 8px;
  border: none; cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  white-space: nowrap; flex-shrink: 0;
  display: inline-block;
}
.nav-cta:hover { background: var(--yellow-dark); transform: translateY(-1px); }

/* Hamburger */
.nav-burger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 8px;
}
.nav-burger span {
  display: block; width: 22px; height: 2px;
  background: var(--dark); border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

/* Mobile nav */
.nav-mobile {
  display: none;
  position: fixed; top: var(--nav-h); left: 0; right: 0;
  background: #fff; z-index: 999;
  flex-direction: column; padding: 16px 24px 24px;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}
.nav-mobile.open { display: flex; }
.nav-mobile .nav-link {
  width: 100%; text-align: left; padding: 12px 16px;
  border-radius: 8px; font-size: 16px; display: block;
}
.nav-mobile .nav-cta {
  width: 100%; margin-top: 8px; text-align: center;
  padding: 14px; font-size: 16px; border-radius: 8px;
  display: block;
}

/* Burger open state */
.nav-burger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-burger.open span:nth-child(2) { opacity: 0; }
.nav-burger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }


/* ═══════════════════════════════════════════════════════
   RESPONSIVE — NAVIGATION
═══════════════════════════════════════════════════════ */
@media (max-width: 860px) {
  .nav-links        { display: none; }
  .nav-cta.desktop  { display: none; }
  .nav-burger       { display: flex; }
  .nav              { padding: 0 20px; }
}


/* ═══════════════════════════════════════════════════════
   SHARED SECTION UTILITIES
═══════════════════════════════════════════════════════ */
.section       { padding: 100px 40px; }
.section-inner { max-width: var(--max-w); margin: 0 auto; }

.section-overline {
  font-size: 11px; font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--slate); margin-bottom: 12px;
  display: flex; align-items: center; gap: 8px;
}
.section-overline::before { content: '✦'; color: var(--yellow); }

.section-h2 {
  font-size: clamp(28px, 3vw, 40px); font-weight: 900;
  line-height: 1.15; letter-spacing: -0.02em; color: var(--dark);
  margin-bottom: 16px;
}
.section-lead {
  font-size: 17px; line-height: 1.7; color: var(--text);
  max-width: 560px; margin-bottom: 48px;
}

/* Buttons */
.btn-primary {
  background: var(--yellow); color: var(--dark);
  font-family: var(--font); font-weight: 800; font-size: 15px;
  padding: 14px 28px; border-radius: 10px; border: none; cursor: pointer;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
  box-shadow: 0 4px 16px rgba(224,232,0,0.35);
  display: inline-block;
}
.btn-primary:hover {
  background: var(--yellow-dark); transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(224,232,0,0.4);
}
.btn-secondary {
  background: transparent; color: var(--slate-dark);
  font-family: var(--font); font-weight: 700; font-size: 15px;
  padding: 14px 24px; border-radius: 10px;
  border: 2px solid var(--slate-pale); cursor: pointer;
  transition: all 0.15s; display: inline-block;
}
.btn-secondary:hover { border-color: var(--slate); background: var(--slate-bg); }

/* Animations */
.fade-up {
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }

@media (max-width: 768px) {
  .section { padding: 72px 20px; }
}