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

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

/* Header */
header {
  background: #01203f;
  color: #fff;
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header h1 {
  font-size: 24px;
}

header ul {
  display: flex;
  list-style: none;
  gap: 20px;
}

header li {
  cursor: pointer;
  transition: color 0.3s;
}

header li:hover {
  color: #ffcc00;
}

/* Main Grid Layout */
main {
  display: grid;
  grid-template-columns: 1fr 3fr 1fr; 
  gap: 10px;
  padding: 10px;
  min-height: 50vh;
}

.left {
  background: lightcoral;
  padding: 20px;
  border-radius: 8px;
}
.left ul{
    padding-left: 20px;
}

.middle {
  background: lightgreen;
  padding: 20px;
  border-radius: 8px;
}

.right {
  display: grid;
  grid-template-rows: 1fr 1fr; 
  gap: 10px;
}

.sidebar {
  background: lightblue;
  padding: 20px;
  border-radius: 8px;
}

.advertise {
  background: gold;
  padding: 20px;
  border-radius: 8px;
}

/* Footer */
footer {
  background: #01203f;
  color: white;
  text-align: center;
  padding: 15px;
  margin-top: 20px;
}

/* Responsive for Mobile */
@media (max-width: 768px) {
  main {
    grid-template-columns: 1fr; 
  }

  .right {
    grid-template-rows: auto; 
  }

  header {
    flex-direction: column;
    gap: 10px;
  }

  header ul {
    flex-direction: column;
    gap: 10px;
  }
}