:root {
    --primary-color: #2c3e50;
    --text-color: #333;
    --background-color: #fff;
    --accent-color: #3498db;
    --max-width: 800px;
    --spacing: 1rem;
    --green-accent: #27ae60;
    --secondary-color: #8e44ad; /* Secondary color */
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: all 0.3s ease; /* Add transition to all elements */
}

body {
    font-family: system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--background-color);
}

header {
    background: var(--primary-color);
    color: white;
    padding: var(--spacing);
    margin-bottom: 2rem;
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav ul {
    list-style: none;
    display: flex;
    gap: var(--spacing);
}

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

nav a:hover {
    color: var(--accent-color); /* Add hover effect */
}

main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing);
}

section {
    margin-bottom: 3rem;
}

h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.cursus-details ul {
    list-style: none;
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 5px;
    margin-bottom: 1.5rem;
}

.cursus-details li {
    margin-bottom: 0.5rem;
}

.lessen-grid {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.les {
    background: linear-gradient(135deg, #f8f9fa, #e0e0e0); /* Add gradient */
    padding: 1.5rem;
    border-radius: 5px;
    border-left: 4px solid var(--accent-color);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1); /* Add box shadow */
}

.les h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

#contact {
    background: linear-gradient(135deg, #f8f9fa, #e0e0e0); /* Add gradient */
    padding: 2rem;
    border-radius: 5px;
    text-align: center;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1); /* Add box shadow */
}

#contact a {
    color: var(--accent-color);
    text-decoration: none;
}

#contact a:hover {
    text-decoration: underline;
}

footer {
    text-align: center;
    padding: var(--spacing);
    background: var(--primary-color);
    color: white;
    margin-top: 3rem;
}

#back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--accent-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    cursor: pointer;
    display: none;
}

#back-to-top:hover {
    background: var(--secondary-color); /* Add hover effect */
}

[aria-hidden="true"] {
    display: none;
}