styles.css

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    width: 80%;
    margin: auto;
    overflow: hidden;
    padding: 20px;
    background: white;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s ease, color 0.3s ease;
}

h1 {
    border-bottom: 2px solid #3498db;
    font-size: 2.5em;
    margin-bottom: 20px;
    text-align: center;
    background: linear-gradient(to right, #3498db, #2980b9);
    color: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

h1:hover {
    background: linear-gradient(to right, #2980b9, #3498db);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

h2, h3, h4 {
    color: #333;
    transition: color 0.3s ease;
}

p {
    color: #555;
    line-height: 1.8;
    transition: color 0.3s ease;
}

a {
    color: #3498db;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

pre {
    background: #f4f4f4;
    padding: 10px;
    border: 1px solid #ddd;
    overflow-x: auto;
    margin-bottom: 20px;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 20px auto;
}

.center {
    text-align: center;
}

ul {
    margin: 20px 0;
    padding: 0;
    list-style: none;
}

ul li {
    background: #f4f4f4;
    margin-bottom: 5px;
    padding: 10px;
    border-left: 3px solid #3498db;
}

ol {
    margin: 20px 0;
    padding: 0 0 0 20px;
}

ol li {
    margin-bottom: 10px;
}

code {
    background: #f4f4f4;
    padding: 2px 4px;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.section {
    margin-bottom: 40px;
}

.highlight {
    background: #eaf5ff;
    padding: 10px;
    border-left: 4px solid #3498db;
    margin: 20px 0;
}

#table-of-contents ul {
    margin: 20px 0;
    padding: 0;
    list-style: none;
}

#table-of-contents ul li {
    background: #f9f9f9;
    margin-bottom: 5px;
    padding: 10px;
    border-left: 3px solid #3498db;
    transition: background 0.3s ease, border-left-color 0.3s ease, box-shadow 0.3s ease;
}

#table-of-contents ul li a {
    display: block;
    color: #3498db;
    text-decoration: none;
    transition: color 0.3s ease;
}

#table-of-contents ul li:hover {
    background: #e0f7ff;
    border-left-color: #2980b9;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

#table-of-contents ul li:hover a {
    color: #2980b9;
}

body.dark-mode {
    background-color: #121212;
    color: #e0e0e0;
}

body.dark-mode .container {
    background-color: #1e1e1e;
    color: #e0e0e0;
}

body.dark-mode h1 {
    background: linear-gradient(to right, #4a4a4a, #2e2e2e);
    color: white;
}

body.dark-mode h2,
body.dark-mode h3,
body.dark-mode h4 {
    color: #e0e0e0;
}

body.dark-mode p {
    color: #b0b0b0;
}

body.dark-mode a {
    color: #82b1ff;
}

body.dark-mode a:hover {
    color: #3399ff;
}

body.dark-mode pre {
    background-color: #2e2e2e;
    border-color: #555;
}

body.dark-mode li {
    background: #2e2e2e;
    border-left-color: #82b1ff;
}

body.dark-mode code {
    background-color: #2e2e2e;
}

body.dark-mode .highlight {
    background-color: #333;
    border-left-color: #82b1ff;
}

.toggle-container {
    position: fixed;
    top: 50%;
    left: 10px;
    transform: translateY(-50%);
}

.toggle-button {
    background: #3498db;
    border: none;
    cursor: pointer;
    outline: none;
    padding: 10px;
    border-radius: 50%;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.toggle-button i {
    font-size: 24px;
    color: white;
    transition: transform 0.3s ease;
}

.toggle-button:hover {
    background: #2980b9;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
}

.toggle-button:hover i {
    transform: rotate(45deg);
}

body.dark-mode .toggle-button {
    background: #82b1ff;
}

body.dark-mode .toggle-button:hover {
    background: #3399ff;
}

#scroll-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 16px;
    padding: 10px 15px;
    cursor: pointer;
    display: none;
    font-size: 20px;
}

#scroll-to-top:hover {
    background-color: #2980b9;
}