* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', sans-serif;
}

body {
  background: linear-gradient(135deg, #6a11cb, #2575fc);
  color: #fff;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  overflow-x: hidden;
}

/* === HEADER === */
header {
  width: 100%;
  padding: 2rem;
  background: rgba(0, 0, 0, 0.2);
  border-bottom-left-radius: 50% 10%;
  border-bottom-right-radius: 50% 10%;
  margin-bottom: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header h1 {
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

/* === NAV === */
nav {
  margin-top: 1rem;
}

nav a {
  color: #fff;
  text-decoration: none;
  margin: 0 1rem;
  padding: 0.5rem 1rem;
  border-radius: 25px;
  background: rgba(255, 255, 255, 0.2);
  transition: background 0.3s;
}

nav a:hover {
  background: rgba(255, 255, 255, 0.4);
}

/* === CONTENT === */
section {
  width: 90%;
  max-width: 1200px;
  margin-bottom: 3rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
}

.card {
  background: rgba(255, 255, 255, 0.1);
  padding: 2rem;
  border-radius: 25px;
  flex: 1 1 250px;
  backdrop-filter: blur(10px);
  transition: transform 0.3s;
  text-align: center;
}

.card:hover {
  transform: translateY(-10px);
}

.card h2 {
  margin-bottom: 1rem;
  font-size: 1.5rem;
}

.card p {
  font-size: 1rem;
  line-height: 1.5;
}

/* === FOOTER === */
footer {
  width: 100%;
  padding: 2rem;
  text-align: center;
  background: rgba(0, 0, 0, 0.2);
  border-top-left-radius: 50% 10%;
  border-top-right-radius: 50% 10%;
  margin-top: auto;
}

/* === BOUTONS === */
.btnlink {
  background: linear-gradient(135deg, #6a11cb, #2575fc);
  color: #fff;
  padding: 12px 20px;
  border-radius: 12px;
  font-weight: 600;
  text-decoration: none;
  width: 90%;
  max-width: 350px;
  text-align: center;
  transition: all 0.2s ease;
  border: none;
  cursor: pointer;
}
.btnlink:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 15px rgba(37, 117, 252, 0.4);
}

/* === RESPONSIVE === */
@media (max-width: 535px) {
  header {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
    padding: 1.5rem;
  }

  header h1 {
    font-size: 2rem;
  }

  nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
  }

  nav a {
    display: block;
    width: 80%;
    text-align: center;
    margin: 0.3rem 0;
    font-size: 0.95rem;
  }

  section {
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
  }

  .card {
    width: 90%;
    padding: 1.5rem;
  }

  footer {
    padding: 1.5rem;
    font-size: 0.9rem;
  }
}