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

/* Body */
body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
}

/* Navigation (Flexbox #1) */
.menu {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #333;
  color: white;
  padding: 1rem;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1rem;
}

.nav-links a {
  color: white;
  text-decoration: none;
}

/* Layout Container (Flexbox #2) */
.container {
  display: flex;
  gap: 20px;
  padding: 20px;
}

/* Main + Aside sizing */
main {
  flex: 3; /* ~75% */
}

aside {
  flex: 1; /* ~25% */
  background: #f4f4f4;
  padding: 15px;
}

/* Cards (Flexbox #3) */
.card-container {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  margin-top: 10px;
}

.card {
  flex: 1 1 calc(50% - 15px);
  background: #ddd;
  padding: 15px;
  border-radius: 8px;
}

/* Aside image */
aside img {
  width: 100%;
  margin: 10px 0;
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    flex-direction: column;
  }

  main {
    order: 1;
  }

  aside {
    order: 2;
  }

  .card {
    flex: 1 1 100%;
  }

  .menu {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links {
    flex-direction: column;
    width: 100%;
  }
}