/* Overall page */
body {
    background-color: #0b0b0b;
    color: #ffffff;
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    line-height: 1.6;
}

/* Header */
header {
    background-color: #171717;
    color: white;
    text-align: center;
    padding: 25px;
    border-bottom: 3px solid #ff2020;
    border-radius: 10px;
}

/* Navigation links */
nav {
    margin-top: 20px;
}

nav a {
    color: #ff4040;
    text-decoration: none;
    margin: 0 8px;
    font-weight: bold;
}

nav a:hover {
    color: white;
}

/* Content sections */
section {
    background-color: #151515;
    margin: 20px 0;
    padding: 20px;
    border-left: 4px solid #e50914;
    border-radius: 8px;
}

/* Headings */
h1, h2, h3, h4 {
    color: #ff3030;
}

/* Course and material cards */
article {
    background-color: #202020;
    padding: 15px;
    margin: 15px 0;
    border: 1px solid #383838;
    border-radius: 8px;
}

/* Forms and input fields */
input, textarea, select {
    background-color: #252525;
    color: white;
    border: 1px solid #555555;
    padding: 9px;
    border-radius: 5px;
    margin: 5px;
}

input:focus, textarea:focus, select:focus {
    outline: 2px solid #ff3030;
}

/* Buttons */
button {
    background-color: #d90000;
    color: white;
    border: none;
    padding: 10px 16px;
    margin: 5px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
}

button:hover {
    background-color: #ff3030;
}

/* Horizontal separators */
hr {
    border: none;
    border-top: 1px solid #444444;
    margin: 25px 0;
}

/* Footer */
footer {
    background-color: #171717;
    color: #cccccc;
    text-align: center;
    padding: 20px;
    border-top: 3px solid #ff2020;
    border-radius: 8px;
}

/* Checkbox spacing */
input[type="checkbox"] {
    accent-color: #ff2020;
}