/* Police élégante */
body {
  font-family: 'Poppins', sans-serif;
  margin: 0;
  background-color: #1c1f26;
  color: #f1f1f1;
  line-height: 1.6;
}

header {
  background-color: #11141a;
  padding: 1.5em 0;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0,0,0,0.4);
}

header h1 {
  margin: 0;
  font-size: 2rem;
}

.nav-tabs {
  list-style: none;
  display: flex;
  justify-content: center;
  padding: 0;
  margin: 1em 0 0 0;
  background-color: #1e222a;
}

.nav-tabs li {
  margin: 0;
}

.nav-tabs a {
  display: block;
  padding: 1em 1.5em;
  color: #f1f1f1;
  text-decoration: none;
  transition: background-color 0.3s, color 0.3s;
}

.nav-tabs a:hover {
  background-color: #00b894;
  color: #fff;
}

main {
  padding: 2em;
  max-width: 900px;
  margin: 0 auto;
}

.page {
  display: none;
  animation: fadeIn 0.5s ease-in;
}

.page.active {
  display: block;
}

.card {
  background-color: #2a2f3a;
  padding: 2em;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}

.card h2 {
  color: #00cec9;
  margin-top: 0;
}

.card a {
  color: #74b9ff;
  text-decoration: none;
}

.card a:hover {
  text-decoration: underline;
}

footer {
  background-color: #11141a;
  color: #aaa;
  text-align: center;
  padding: 1em;
  margin-top: 2em;
  font-size: 0.9em;
}

/* Animation */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 600px) {
  .nav-tabs {
    flex-direction: column;
  }

  .nav-tabs a {
    text-align: center;
  }
}