/* Define CSS Variables */
:root {
    --font-family: 'Fira Code', monospace;
    --background-color: #2b2b2b;
    --text-color: #d0d0d0;
    --header-background-color: #333;
    --header-border-color: #4caf50;
    --link-color: #4caf50;
    --link-hover-color: #45a049;
    --sidebar-background-color: #3a3a3a;
    --button-background-color: #4caf50;
    --button-hover-background-color: #45a049;
    --error-color: red;
    --nav-background-color: #333;
    --nav-hover-background-color: #111;
}

/* Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

a {
    color: var(--link-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Header */
header {
    background-color: var(--header-background-color);
    padding: 20px;
    text-align: center;
    border-bottom: 2px solid var(--header-border-color);
}

header h1 {
    color: #f1f1f1;
    font-size: 2em;
}

nav a {
    color: #f1f1f1;
    margin-left: 20px;
}

nav a:hover {
    color: var(--link-color);
}

/* Main Layout */
.container {
    display: flex;
    flex-direction: row;
    min-height: 100vh;
}

main {
    flex: 1;
    padding: 20px;
}

/* Sidebar */
/* Sidebar */
.sidebar {
    width: 250px;
    background-color: var(--sidebar-background-color);
    padding: 20px;
    height: 100%;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.sidebar h2 {
    color: #f1f1f1;
    margin-bottom: 20px;
}

.sidebar ul {
    list-style: none;
    padding: 0;
    flex-grow: 1; /* This makes the ul take up the remaining space */
}

.sidebar ul li {
    margin-bottom: 10px;
}

.sidebar ul li a {
    color: #fff;
    font-weight: bold;
}

.sidebar ul li a:hover {
    text-decoration: underline;
}


/* Assignment Content */
.content h2 {
    color: #f1f1f1;
    margin-bottom: 10px;
}

.content h3 {
    color: var(--link-color);
    margin-bottom: 5px;
}

.content p {
    margin-bottom: 20px;
    color: var(--text-color);
}

/* Forms */
form {
    background-color: var(--sidebar-background-color);
    padding: 20px;
    border-radius: 5px;
    margin-bottom: 20px;
}

form label {
    display: block;
    color: #f1f1f1;
    margin-bottom: 10px;
}

form input[type="text"],
form input[type="password"],
form textarea {
    width: 100%;
    padding: 10px;
    margin-bottom: 20px;
    background-color: var(--background-color);
    color: #f1f1f1;
    border: 1px solid var(--link-color);
    border-radius: 5px;
}

form button {
    width: 100%;
    padding: 10px;
    background-color: var(--button-background-color);
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

form button:hover {
    background-color: var(--button-hover-background-color);
}

/* Error message */
p.error {
    color: var(--error-color);
    margin-top: 10px;
}

/* Navigation */
nav {
    background-color: var(--nav-background-color);
    overflow: hidden;
}

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

nav ul li {
    float: left;
}

nav ul li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

nav ul li a:hover {
    background-color: var(--nav-hover-background-color);
}