/* Reset de base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Corps */
body {
  margin: 0;
  font-family: 'Poppins', 'Arial', sans-serif;
  background-color: #ffffff;
  color: #333;
}

/* Header */
header {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 15px 30px;
  background: #006475;
  backdrop-filter: blur(0.25px);
  position: fixed;
  width: 100%;
  top: 0;
  left: 0;
  z-index: 1000;
}

/* Navigation */
.nav-center {
  list-style: none;
  display: flex;
  gap: 40px;
  padding: 0;
  margin: 0 auto;
}

.nav-center li {
  display: inline;
}

.nav-center li a {
  text-decoration: none;
  color: #ffffff;
  font-size: 18px;
  font-weight: bold;
  text-transform: uppercase;
  transition: 0.3s;
  position: relative;
}

/* Animation sous le lien */
.nav-center li a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 100%;
  height: 2px;
  background-color: #00d9ff;
  transform: scaleX(0);
  transition: transform 0.3s ease-in-out;
}

.nav-center li a:hover::after {
  transform: scaleX(1);
}

.nav-center li a:hover {
  color: #00d9ff;
  transform: scale(1.1);
}

.nav-center li a.active {
  color: #00d9ff;
}

/* Section principale */
main {
  flex: 1;
  padding-top: 120px; /* Pour ne pas cacher le contenu sous le header */
  min-height: calc(100vh - 120px - 60px); /* Hauteur visible moins header/footer */
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
}

.intro-section h1 {
  font-size: 2.5rem;
  color: #006475;
  margin-bottom: 1rem;
}

.intro-section p {
  font-size: 1.2rem;
  margin-bottom: 1.5rem;
}

/* Bouton principal */
.btn-primary {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background: #00d9ff;
  color: #ffffff;
  border-radius: 30px;
  text-decoration: none;
  font-weight: 600;
  transition: background 0.3s, transform 0.3s;
}

.btn-primary:hover {
  background: #006475;
  transform: translateY(-3px);
}

/* Footer */
footer {
  text-align: center;
  padding: 1rem 0;
  background: #f0f0f0;
  font-size: 0.9rem;
  margin-top: auto;
}

.intro-section {
  max-width: 800px;
  margin: 0 auto;
  animation: fadeIn 1.5s ease-out;
}

.intro-section h1 {
  font-size: 3rem;
  color: #006475;
  margin-bottom: 1rem;
  font-weight: 700;
}

.intro-section p {
  font-size: 1.25rem;
  color: #555555;
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

/* Animation d'apparition */
@keyframes fadeIn {
  from {
      opacity: 0;
      transform: translateY(20px);
  }
  to {
      opacity: 1;
      transform: translateY(0);
  }
}