* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  scroll-behavior: smooth;
}

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  --scroll: 0;
  background: linear-gradient(to bottom, #477dd1 0%, #000 calc(var(--scroll) * 80%));
  background-attachment: fixed;
  transition: background 0.2s ease-out;
}

/* Navbar effet liquid glass */
.navbar {
  position: fixed;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 15px;
  padding: 10px 20px;
  border-radius: 30px;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
}

/* Boutons arrondis */
.nav-btn {
  padding: 8px 14px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.3);
  text-decoration: none;
  color: #fff;
  font-weight: bold;
  transition: background 0.3s ease, color 0.3s ease;
}

.nav-btn:hover {
  background: rgba(255, 255, 255, 0.5);
  color: #000;
}

.section {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 40px;
  color: white;
}

.content h1, .content h2 {
  margin-bottom: 20px;
  font-size: 2.5rem;
}

.content p, .content a {
  font-size: 1.2rem;
}