*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --vert-fonce: #1a4a4a;
  --vert-moyen: #1d6e5a;
  --vert-clair: #9dc329;
  --teal: #2a8a6e;
  --texte: #1e2e2e;
  --texte-doux: #4a5a5a;
  --fond: #f7f9f7;
  --blanc: #ffffff;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--texte);
  background: var(--blanc);
}

/* NAV */
nav {
  background: var(--vert-fonce);
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 64px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.18);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.nav-logo img {
  height: 44px;
  width: auto;
  filter: brightness(0) invert(1);
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: color 0.2s;
  letter-spacing: 0.02em;
}

.nav-links a:hover { color: var(--vert-clair); }

/* HERO */
#accueil {
  background: var(--blanc);
  color: var(--texte);
  padding: 80px 2rem 72px;
  text-align: center;
  border-bottom: 3px solid var(--vert-clair);
}

.hero-logo {
  width: 200px;
  margin-bottom: 28px;
}

#accueil h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
  color: var(--vert-fonce);
}

.hero-sous-titre {
  font-size: 1.05rem;
  color: var(--texte-doux);
  margin-bottom: 32px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--texte-doux);
  max-width: 620px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

.btn-contact {
  display: inline-block;
  background: var(--vert-clair);
  color: var(--vert-fonce);
  font-weight: 700;
  font-size: 1rem;
  padding: 14px 36px;
  border-radius: 4px;
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: background 0.2s, transform 0.15s;
}

.btn-contact:hover {
  background: #b5d832;
  transform: translateY(-1px);
}

/* SECTIONS */
section {
  padding: 72px 2rem;
}

.container {
  max-width: 820px;
  margin: 0 auto;
}

.section-tag {
  display: inline-block;
  background: var(--vert-clair);
  color: var(--vert-fonce);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 2px;
  margin-bottom: 16px;
}

section h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  color: var(--vert-fonce);
  font-weight: 700;
  margin-bottom: 24px;
  line-height: 1.3;
}

section p {
  color: var(--texte-doux);
  margin-bottom: 16px;
  max-width: 740px;
}

section p:last-child { margin-bottom: 0; }

/* HISTORIQUE */
#historique {
  background: var(--fond);
  border-top: 3px solid var(--vert-clair);
}

/* MISSION */
#mission {
  background: var(--blanc);
}

.mission-liste {
  list-style: none;
  margin-top: 8px;
}

.mission-liste li {
  display: flex;
  gap: 14px;
  margin-bottom: 16px;
  color: var(--texte-doux);
  align-items: flex-start;
}

.mission-liste li::before {
  content: '';
  display: block;
  min-width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--vert-clair);
  margin-top: 7px;
}

/* FOOTER */
footer {
  background: var(--vert-fonce);
  color: rgba(255,255,255,0.7);
  text-align: center;
  padding: 32px 2rem;
  font-size: 14px;
  line-height: 2;
}

footer strong { color: var(--blanc); }
footer a { color: var(--vert-clair); text-decoration: none; }

/* HAMBURGER */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 6px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: rgba(255,255,255,0.85);
  border-radius: 2px;
  transition: all 0.25s;
}

.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* RESPONSIVE */
@media (max-width: 620px) {
  nav { padding: 0 1rem; height: 56px; align-items: center; flex-wrap: wrap; position: relative; }
  .nav-logo img { height: 36px; }
  .hamburger { display: flex; }

  .nav-links {
    display: none;
    flex-direction: column;
    gap: 0;
    position: absolute;
    top: 56px;
    left: 0; right: 0;
    background: var(--vert-fonce);
    border-top: 1px solid rgba(255,255,255,0.12);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  }

  .nav-links.open { display: flex; }
  .nav-links li { border-bottom: 1px solid rgba(255,255,255,0.08); }
  .nav-links a {
    display: block;
    padding: 14px 1.2rem;
    font-size: 15px;
  }

  section { padding: 48px 1.2rem; }
  #accueil { padding: 52px 1.2rem 48px; }
  .hero-logo { width: 120px; margin-bottom: 20px; }

  .btn-contact {
    display: block;
    text-align: center;
    padding: 16px 24px;
  }

  footer { font-size: 13px; line-height: 2.2; padding: 28px 1.2rem; }
}