body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    background: #f0f4f7;
}

.header {
    background-color: #343a40;
    color: white;
    text-align: center;
    padding: 50px 0;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.header h1 {
    font-weight: 700;
    font-size: 36px;
}

.header p {
    font-size: 18px;
    font-weight: 400;
    color: #ccc;
}

.navbar {
    margin-bottom: 20px;
}

#nav {
    margin-top: 20px;
    padding-top: 10px;
}

#content {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 20px;
}

.project-button {
    display: inline-flex;
    padding: 15px 30px;
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    background-color: #007bff;
    border-radius: 30px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    text-align: center;
    margin: 5px 0;
    width: auto;
    max-width: 200px;
    border: none;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.project-button:hover {
    background-color: #0056b3;
    transform: scale(1.1);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.project-button:focus {
    outline: none;
}

iframe {
    width: 100%;
    max-width: 1000px;
    height: 700px;
    border: none;
    margin: 0 auto;
    border-radius: 10px;
}

.list-group-item {
    font-size: 16px;
    font-weight: 500;
    color: #495057;
    border: 1px solid #ddd;
    border-radius: 8px;
    margin-bottom: 10px;
    transition: background-color 0.3s ease;
}

.list-group-item:hover {
    background-color: #007bff;
    color: #fff;
}

.sticky-top {
    position: -webkit-sticky;
    position: sticky;
    top: 20px;
    z-index: 10;
}