* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
    background-color: #f0f2f5;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header Styles */
.top-header {
    background-color: #0084ff;
    color: white;
    padding: 15px 20px;
    display: flex;
    align-items: center;
    gap: 30px;
}

.logo {
    font-size: 24px;
    font-weight: bold;
}

.top-nav a {
    color: white;
    text-decoration: none;
    margin-right: 20px;
    font-size: 14px;
}

/* Main Container */
.main-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar Styles */
.sidebar {
    width: 300px;
    background-color: white;
    border-right: 1px solid #ddd;
    display: flex;
    flex-direction: column;
}

.sidebar-tabs {
    display: flex;
    border-bottom: 1px solid #ddd;
}

.sidebar-tabs button {
    flex: 1;
    padding: 10px;
    border: none;
    background: #f8f9fa;
    cursor: pointer;
}

.sidebar-tabs button.active {
    background: white;
    border-bottom: 2px solid #0084ff;
    font-weight: bold;
    color: #0084ff;
}

.users-list {
    overflow-y: auto;
    flex: 1;
}

.user-item {
    display: flex;
    align-items: center;
    padding: 15px;
    border-bottom: 1px solid #eee;
    cursor: pointer;
}

.user-item:hover {
    background-color: #f0f2f5;
}

.user-item img {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    margin-right: 15px;
}

.user-info h4 {
    font-size: 14px;
    color: #333;
}

.user-info p {
    font-size: 12px;
    color: #777;
}

.badge {
    background-color: red;
    color: white;
    border-radius: 50%;
    padding: 2px 8px;
    font-size: 12px;
    margin-left: auto;
}

/* Chat Area Styles */
.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: white;
}

.welcome-banner {
    background-color: #00c3ff;
    color: white;
    padding: 20px;
    margin: 20px;
    border-radius: 8px;
}

.welcome-banner h2 { margin-bottom: 10px; }
.welcome-banner ul { margin-left: 20px; margin-top: 10px; }

.chat-box {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.message-input-area {
    padding: 15px;
    border-top: 1px solid #ddd;
    display: flex;
    background-color: #f0f2f5;
}

.message-input-area input {
    flex: 1;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 20px;
    outline: none;
}

.message-input-area button {
    background-color: #0084ff;
    color: white;
    border: none;
    padding: 0 20px;
    margin-left: 10px;
    border-radius: 20px;
    cursor: pointer;
}