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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  background-color: #f9f9f9;
  color: #333;
}

/* Container */
.container {
  width: 90%;
  max-width: 1100px;
  margin: 0 auto;
}

/* Navbar */
.navbar {
  background-color: #004080;
  padding: 1rem 0;
  color: #fff;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar .logo {
  font-size: 1.8rem;
  font-weight: bold;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.2rem;
}

.nav-links a {
  color: white;
  text-decoration: none;
  font-weight: 500;
}

.nav-links a:hover {
  text-decoration: underline;
}

/* Hero Section */
.hero {
  background-color: #e6f2ff;
  padding: 4rem 0;
  text-align: center;
}

.hero h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
}

.btn {
  background-color: #004080;
  color: #fff;
  padding: 0.8rem 1.5rem;
  text-decoration: none;
  border-radius: 5px;
  font-weight: bold;
}

.btn:hover {
  background-color: #002e5c;
}

/* Features */
.features {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 4rem 0;
  flex-wrap: wrap;
}

.feature-card {
  background-color: #fff;
  border-radius: 8px;
  padding: 2rem;
  flex: 1;
  box-shadow: 0 0 10px rgba(0,0,0,0.05);
  min-width: 250px;
  text-align: center;
}

.feature-card h3 {
  margin-bottom: 1rem;
  color: #004080;
}

.feature-card p {
  margin-bottom: 1rem;
}

.feature-card a {
  color: #004080;
  font-weight: bold;
  text-decoration: none;
}

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

/* Footer */
.footer {
  background-color: #004080;
  color: white;
  padding: 1rem 0;
  text-align: center;
  font-size: 0.9rem;
}

/* Learning Content Enhancements */
.definition-box {
  background-color: #d6eaff;
  padding: 1rem;
  border-left: 5px solid #007acc;
  margin-bottom: 2rem;
  font-size: 1.1rem;
}

.code-box {
  background-color: #f4f4f4;
  padding: 1rem;
  border-left: 4px solid #004080;
  margin: 1rem 0;
  font-family: monospace;
  overflow-x: auto;
}

.mistakes {
  color: #c0392b;
  padding-left: 1.2rem;
  margin-bottom: 2rem;
}

.next-topic a {
  background-color: #004080;
  color: white;
  padding: 0.5rem 1rem;
  text-decoration: none;
  border-radius: 6px;
  display: inline-block;
}

.next-topic a:hover {
  background-color: #003060;
}