/* Basic Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Body and layout styles */
body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    display: flex;
}

.container {
    width: 80%;
    margin: 0 auto;
}

header, footer {
    background-color: #333;
    color: white;
    padding: 20px 0;
    text-align: center;
}

footer p {
    margin: 0;
}

/* Sidebar navigation */
.sidebar {
    width: 150px;
    background-color: #2c3e50;
    color: white;
    padding: 20px;
    height: 100vh;
    position: fixed;
}

.sidebar h2 {
    font-size: 1em;
    margin-bottom: 20px;
}

.sidebar ul {
    list-style: none;
}

.sidebar ul li {
    margin: 10px 0;
}

.sidebar ul li a {
    color: white;
    text-decoration: none;
    font-size: 1.1em;
}

.sidebar ul li a.active {
    font-weight: bold;
}

/* Main Content Styles */
.main-content {
    margin-left: 150px;
    width: calc(100% -50px);
}

.section {
    margin: 20px 0;
}

/* exer Styles */
.exer-question {
    margin-bottom: 20px;
}

.exer-dropdown {
    margin-bottom: 20px;
}

.exer-options {
    margin-bottom: 20px;
}

.exer-image {
	width: 350px;
	height: 210px;
}

.submit-btn {
    background-color: #2ecc71;
    color: white;
    padding: 10px 20px;
    border: none;
    cursor: pointer;
    font-size: 1.1em;
}

/* Floating button style */
.floating-btn {
    position: fixed;
    top: 15px;
    left: 150px;
    z-index: 1000;
    background-color: #444;
    color: white;
    border: none;
    border-radius: 50%;
    width: 45px;
    height: 45px;
    font-size: 24px;
    cursor: pointer;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
    transition: all 0.3s ease;
}

/* Move button when sidebar is collapsed */
.sidebar.collapsed ~ .floating-btn {
    left: 10px;
}

/* Sidebar collapsed state */
.sidebar.collapsed {
    width: 0;
    padding: 0;
    overflow: hidden;
    transition: width 0.3s ease, padding 0.3s ease;
}

/* Main content adjustment */
.main-content.expanded {
    margin-left: 0;
    width: 100%;
    transition: all 0.3s ease;
}