html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  background: url('fond.png') no-repeat center center;
  background-size: cover;


header {
  position: relative;
  background: url('fond.png') no-repeat center center/cover;
  color: white;
  text-align: center;
  padding: 4em 0;
}

header .overlay {
  background: rgba(0, 0, 0, 0.6);
  padding: 2em;
}

.logo {
  max-width: 200px;
  margin-bottom: 1em;
}

h2 {
  color: #1e88e5;
  margin-bottom: 1em;
}

.container {
  max-width: 960px;
  margin: auto;
  padding: 2em;
}

.grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1em;
}

.card {
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  padding: 1.5em;
  flex: 1 1 calc(50% - 1em);
}

.btn {
  display: inline-block;
  margin-top: 1em;
  padding: 0.75em 1.5em;
  background-color: #1e88e5;
  color: white;
  text-decoration: none;
  border-radius: 4px;
}

footer {
  background: url('fond.png') no-repeat center center;
  background-size: cover;
  text-align: center;
  padding: 1em 0;
  margin-top: 2em;
}

@media (max-width: 768px) {
  .grid {
    flex-direction: column;
  }
}