body, html {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
}

.chat-list {
    padding: 10px;
    background-color: #fff;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.chat-item {
    display: flex;
    align-items: center;
    padding: 15px;
    background-color: #e9e9e9;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    cursor: pointer;
}

.chat-info {
    flex: 1;
}

.username {
    margin: 0;
    font-size: 16px;
    font-weight: bold;
}

.last-message {
    margin: 0;
    font-size: 14px;
    color: #555;
}

@media (max-width: 600px) {
    .chat-list {
        padding: 5px;
    }

    .chat-item {
        flex-direction: column;
        padding: 10px;
    }

    .chat-info {
        text-align: center;
    }

    .username, .last-message {
        text-align: center;
    }
}

@media (min-width: 600px) {
    .chat-list {
        padding: 15px;
    }

    .chat-item {
        flex-direction: row;
        padding: 15px;
    }

    .chat-info {
        text-align: left;
    }

    .username, .last-message {
        text-align: left;
    }
}

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

.chat-box {
    width: 80%;
    max-width: 600px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    overflow: hidden;
    z-index: 1001; /* Ensures the chat box overlaps the overlay */
}

.chat-header {
    background-color: #e9e9e9;
    padding: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-messages {
    padding: 15px;
    height: 400px;
    overflow-y: auto;
    background-color: #f9f9f9;
}

.chat-input {
    padding: 15px;
    display: flex;
    align-items: center;
}

.chat-input input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-right: 10px;
}

.chat-input button {
    padding: 10px 15px;
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

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