html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Montserrat', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    margin: 0 100px;
    padding: 20px;
    /* background-color: #222; */
    color: #ddd;
}

h1 {
    font-size: 36px;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #ff9800;
}

h2 {
    font-size: 32px;
    margin-bottom: 15px;
    letter-spacing: 1px;
    color: #03a9f4;

}

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

li {
    margin-bottom: 10px;

}

p {
    margin-top: 0;
    margin-bottom: 30px;
    font-size: 18px;
    line-height: 1.8;

}

input[type="checkbox"] {
    margin-right: 5px;
    cursor: pointer;
    width: 18px;
    height: 18px;
}

.level7-12 {
    font-size: 25px;
}

section {
    margin-bottom: 50px;
}

#scrollToTopBtn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: #45a049;
    color: white;
    border: none;
    border-radius: 5px;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    display: inline-block;
    transition: all 0.5s ease, transform 0.5s ease;
}

#scrollToTopBtn:hover {
    background-color: #03a9f4;
    transform: scale(1.1);
    box-shadow: 0 0 10px 5px #03a9f4
}


a {
    display: inline-block;
    color: #ff9800;
    text-decoration: none;
    transition: all 0.5s ease, transform 0.5s ease;
}

a:hover {
    text-decoration: none;
    box-shadow: 0 0 30px 10px rgba(255, 152, 0, 0.5);
    transform: scale(1.1);
}

#background-video {
    position: fixed;
    right: 0;
    bottom: 0;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    z-index: -1;
    filter: grayscale(70%) brightness(15%);
}

#toc {
    display: inline-block;
    border-style: solid;
    border-width: 1px;
    padding: 15px;
}

#bAct1, #bAct2, #bAct3 {
    margin-top: 50px;
}