:root {
  --primary: #1e3a8a; /* Navy Blue */
  --secondary: #F4C430; /* Emerald Green */
  --text: #1f2937; /* Gray-800 */
  --bg: #f9fafb; /* Gray-50 */
  --light-bg: #ffffff;
  --gray-bg: #f3f4f6;
}

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

body {
  font-family: 'Segoe UI', sans-serif;
  line-height: 1.7;
  color: var(--text);
  background-color: var(--bg);
}

section {
  padding: 3rem 1rem;
}

h1, h2 {
  margin-bottom: 1rem;
  font-weight: 700;
  color: var(--primary);
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.5rem;
  text-align: center;
}

p, li {
  font-size: 1.125rem;
  margin-bottom: 1rem;
}

a.button {
  display: inline-block;
  background: var(--secondary);
  color: #1E3A8A;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  text-decoration: none;
  font-weight: 600;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  transition: background 0.3s, transform 0.2s;
}

a.button:hover {
  background: #059669;
  transform: translateY(-2px);
}

.subnote {
  font-size: 0.9rem;
  margin-top: 0.5rem;
  color: #6b7280;
}

.text-center {
  text-align: center;
}

.max-w {
  max-width: 720px;
  margin: 0 auto;
}

.hero {
  background: #e0f2fe;
}

.light-bg {
  background: var(--light-bg);
}

.gray-bg {
  background: var(--gray-bg);
}

.course-grid, .feature-grid {
  display: grid;
  gap: 1rem;
}

.course-grid {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.feature-grid {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

ul {
  list-style: none;
  padding-left: 0;
}

ul li::before {
  content: '✅ ';
  color: var(--secondary);
}

footer {
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.875rem;
  color: #6b7280;
}

@media (min-width: 768px) {
  h1 {
    font-size: 2.5rem;
  }
  h2 {
    font-size: 2rem;
  }
}