/* Nút chat */
#chat-icon {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: #0073e6;
    color: white;
    padding: 15px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 24px;
    text-align: center;
}

/* Cửa sổ chat */
#chat-modal {
    display: none;
    position: fixed;
    bottom: 80px;
    right: 20px;
    width: 300px;
    background: white;
    border: 1px solid #ccc;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.2);
}

/* Header */
#chat-header {
    background: #0073e6;
    color: white;
    padding: 10px;
    text-align: center;
    font-weight: bold;
    position: relative;
}

#close-chat {
    position: absolute;
    right: 10px;
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 16px;
}

/* Body */
#chat-body {
    height: 300px;
    overflow-y: auto;
    padding: 10px;
    background: #f9f9f9;
}

/* Footer */
#chat-footer {
    display: flex;
    padding: 10px;
    border-top: 1px solid #ddd;
}

#user-input {
    flex: 1;
    padding: 5px;
    border: 1px solid #ddd;
    border-radius: 5px;
}

#send-btn {
    background: #0073e6;
    color: white;
    border: none;
    padding: 5px 10px;
    cursor: pointer;
}