body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

.container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    background-color: #2c2c2c;
    color: #fff;
    width: 200px;
    padding: 20px;
}

.logo {
    font-size: 24px;
    margin-bottom: 30px;
}

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

.sidebar nav ul li {
    margin-bottom: 20px;
}

.sidebar nav ul li a {
    color: #fff;
    text-decoration: none;
    font-size: 18px;
}

.sidebar nav ul li a:hover {
    color: #03a9f4;
}

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

.top-nav {
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.top-nav ul {
    list-style-type: none;
    display: flex;
    gap: 15px;
}

.top-nav ul li {
    display: inline;
}

.top-nav ul li input[type="search"] {
    padding: 7px;
    font-size: 16px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.top-nav ul li a img {
    width: 20px;
    height: 20px;
}

.discussion-topics {
    margin-top: 20px;
}

.discussion-topics h1 {
    font-size: 28px;
    margin-bottom: 20px;
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.topic-card {
    background-color: #fff;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.topic-card img {
    width: 100%;
    height: auto;
    border-radius: 8px;
}

.topic-card h3 {
    margin: 15px 0;
    font-size: 22px;
}

.topic-card p {
    font-size: 16px;
    color: #777;
}

.online-users {
    background-color: #fff;
    width: 150px;
    padding: 20px;
}

.online-users h3 {
    font-size: 20px;
    margin-bottom: 20px;
}

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

.online-users ul li {
    margin-bottom: 15px;
}

.online-users ul li a {
    text-decoration: none;
    color: #333;
}

.online-users ul li a:hover {
    color: #03a9f4;
}

footer {
    text-align: center;
    padding: 15px;
    background-color: #f4f4f4;
    color: #777;
}

footer span {
    color: #e74c3c;
}

footer a {
    text-decoration: none;
    color: #03a9f4;
}

/* Sidebar collapse */
.sidebar.collapsed {
    width: 60px;
    transition: width 0.3s;
}

.sidebar.collapsed .logo h2 {
    display: none;
}

.sidebar.collapsed nav ul li a {
    font-size: 14px;
}

/* Dropdown styling */
.dropdown-content {
    display: none;
    position: absolute;
    background-color: #fff;
    box-shadow: 0px 8px 16px rgba(0, 0, 0, 0.2);
    padding: 10px;
    z-index: 1;
    right: 0;
}

.dropdown-content p {
    margin: 0;
    padding: 8px 10px;
    cursor: pointer;
}

.dropdown-content p:hover {
    background-color: #f1f1f1;
}

.dropdown-content.show {
    display: block;
}