/* Base Styles */
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f5f7fa;
  color: #222;
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: #0077cc;
}

.container {
  max-width: 1000px;
  margin: auto;
  padding: 2rem;
}

/* Header */
header {
  background-color: #ffffff;
  border-bottom: 1px solid #ddd;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header h1 {
  font-size: 1.5rem;
  color: #333;
}

/* Subject Title */
.subject-title {
  font-size: 2rem;
  margin-top: 1.5rem;
  text-align: center;
  color: #2a2a2a;
}

/* Section */
.section {
  margin-top: 2.5rem;
  background: #ffffff;
  padding: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

.section h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: #444;
}

.section ul {
  list-style: disc;
  padding-left: 1.5rem;
}

.section ul li {
  margin-bottom: 0.5rem;
}

/* Footer */
footer {
  background-color: #1e1e1e;
  color: #ddd;
  text-align: center;
  padding: 1rem;
  margin-top: 3rem;
  font-size: 0.9rem;
}

/* Responsive */
@media screen and (max-width: 600px) {
  .container {
    padding: 1rem;
  }

  header {
    flex-direction: column;
    align-items: flex-start;
  }

  header h1 {
    margin-bottom: 0.5rem;
  }
}