@media screen and (max-width: 768px) {
    .top-bar {
        flex-direction: column;
        gap: 8px;
        padding: 10px 15px;
    }

    #user,
    #key {
        width: 100%;
        font-size: 16px;
        height: 40px;
        box-sizing: border-box;
    }

    #chat p {
        max-width: 85%;
    }

    #msg {
        font-size: 16px;
        height: 40px;
        box-sizing: border-box;
    }

    .bottom-bar {
        padding: 10px 15px;
        gap: 8px;
    }

    #sendBtn {
        padding: 8px 16px;
        min-width: 80px;
        height: 40px;
    }

    #clearKeyBtn,
    #loadBtn {
        padding: 8px 0;
        width: 100%;
        height: 40px;
        font-size: 16px;
    }

    h2 {
        font-size: 1.5em;
        padding: 10px 0;
    }

    h3 {
        font-size: 1em;
        padding: 8px 0;
    }

    #clearKeyBtn:hover,
    #loadBtn:hover,
    #sendBtn:hover,
    ::-webkit-scrollbar-thumb:hover {
        animation: none;
    }

    #clearKeyBtn:active {
        background-color: #d32f2f;
    }

    #loadBtn:active,
    #sendBtn:active {
        background-color: #357ABD;
    }
}