.chat-overlay {
    display: none; /* Initially hidden */
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5); /* Semi-transparent background */
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.chat-app {
    display: flex;
    flex-direction: row;
    width: 90%; /* Adjust width for responsiveness */
    max-width: 800px;
    border-radius: 5px;
    overflow: hidden;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    background-color: #fff;
    max-height: 60vh; /* Prevent the chat box from being too large */
}

.user-list {
    width: 30%;
    min-width: 180px; /* Prevent the sidebar from being too small */
    background-color: #f8f9fa;
    border-right: 1px solid #ddd;
    padding: 10px;
    box-sizing: border-box;
    overflow-y: auto; /* Allow scrolling in the user list if necessary */
}

.user {
    display: flex;
    align-items: center;
    padding: 10px;
    cursor: pointer;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.user img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-right: 10px;
}

.user:hover {
    background-color: #e9ecef;
}

.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: #fff;
    overflow: hidden; /* Prevent overflow */
}

.chat-header {
    background-color: #007bff;
    color: white;
    padding: 10px;
    text-align: center;
    font-size: 18px;
    position: relative;
}

.close-button {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: #dc3545;
    color: white;
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    font-size: 16px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
}

.close-button:hover {
    background-color: #c82333;
}

.messages {
    flex: 1;
    padding: 10px;
    overflow-y: auto;
    max-height: 400px; /* Limit the height of messages */
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.message-box {
    max-width: 80%;
    padding: 10px;
    border-radius: 8px;
    margin: 5px 0;
    line-height: 1.5;
    display: block;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.message-left {
    background-color: #f8f9fa;
    align-self: flex-start;
}

.message-right {
    background-color: #d1e7ff;
    align-self: flex-end;
}

.input-container {
    display: flex;
    padding: 10px;
    border-top: 1px solid #ddd;
    box-sizing: border-box;
}

.input-container input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
}

.input-container button {
    padding: 10px 15px;
    margin-left: 10px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}

.input-container button:hover {
    background-color: #0056b3;
}

.chat-button {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 50%;
    padding: 20px; /* Larger padding for circle shape */
    cursor: pointer;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    font-size: 20px;
    width: 60px;
    height: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
}

#countUnreadMessages {
    position: absolute;
    top: -3px;
    right: -3px;
    background-color: red;
    color: white;
    border-radius: 50%;
    height: 25px;
    width: 25px;
    font-size: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2px;
    box-sizing: border-box;
}

.chat-button:hover {
    background-color: #0056b3;
}

@media (max-width: 600px) {
    .chat-app {
        flex-direction: column;
        width: 100%;
        height: 90%;
        max-height: 100%;
        overflow-y: auto; /* Allow scrolling when necessary */
    }

    .user-list {
        max-height: 40%;
        width: 100%;
        border-right: none;
        border-bottom: 1px solid #ddd;
    }

    .chat-button {
        width: 50px;
        height: 50px;
        font-size: 12px;
        padding: 5px;
    }

    .input-container input {
        font-size: 14px;
    }

    .input-container button {
        font-size: 14px;
        padding: 8px 12px;
    }
}