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

body {
  background: #f4f6f9;
}

/* Navbar */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #007bff;
  padding: 10px 20px;
  color: white;
}

.logo {
  font-size: 20px;
  font-weight: bold;
}

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

.nav-links li {
  margin: 0 10px;
}

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

.menu-toggle {
  display: none;
  font-size: 24px;
  cursor: pointer;
}

/* Sections */
.container {
  padding: 20px;
}

.section {
  margin: 40px 0;
}

h1, h2 {
  text-align: center;
  margin-bottom: 20px;
}

/* Grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 15px;
}

.card {
  background: white;
  padding: 15px;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  transition: 0.3s;
}

.card:hover {
  transform: translateY(-5px);
}

.card span {
  display: block;
  margin-top: 10px;
  color: #555;
}

/* Mobile */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    flex-direction: column;
    background: #007bff;
    position: absolute;
    top: 50px;
    right: 0;
    width: 200px;
  }

  .nav-links.show {
    display: flex;
  }

  .menu-toggle {
    display: block;
  }
}


.literature-basics {
  padding: 30px 15px;
  text-align: center;
  background: #f5f7fb;
}

.literature-basics h1 {
  font-size: 2rem;
}

.intro {
  margin: 10px 0 20px;
  color: #555;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 15px;
}

.card {
  background: white;
  padding: 15px;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  text-align: left;
  transition: 0.3s;
}

.card:hover {
  transform: translateY(-5px);
}

.card h2 {
  color: #333;
  margin-bottom: 8px;
}

.card p {
  font-size: 14px;
  color: #555;
}

button {
  margin-top: 20px;
  padding: 10px 20px;
  border: none;
  background: #007bff;
  color: white;
  border-radius: 6px;
  cursor: pointer;
}

.tips {
  display: none;
  margin-top: 15px;
  background: white;
  padding: 10px;
  border-radius: 8px;
}

/* Mobile */
@media (max-width: 600px) {
  .literature-basics h1 {
    font-size: 1.5rem;
  }
}