body {
    font-family: 'Roboto', sans-serif;
    background-color: #f8f9fa;
    color: #333;
    transition: background-color 0.3s, color 0.3s;
}
.hero {
    text-align: center;
    padding: 60px 20px;
    background: linear-gradient(120deg, #84fab0 0%, #8fd3f4 100%);
    color: white;
}
.card {
    transition: transform 0.3s, box-shadow 0.3s;
    margin: 15px;
    border: none;
    border-radius: 15px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}
.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}
.footer {
    background-color: #343a40;
    color: white;
    padding: 20px;
}
.footer a {
    color: #fff;
    margin-right: 15px;
}
.accordion-button:not(.collapsed) {
    background-color: #007bff;
    color: white;
}
.dark-theme {
    background-color: #212529;
    color: #e9ecef; /* Lighter color for text */
}
.dark-theme .footer {
    background-color: #343a40;
}
.dark-theme .card {
    background-color: #343a40; /* Card background in dark theme */
    color: #e9ecef; /* Card text color in dark theme */
}
.dark-theme .card:hover {
    background-color: #495057; /* Card hover background in dark theme */
}
.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: none;
}