.mobile-menu-btn {
    position: fixed;
    top: var(--space-md);
    left: var(--space-md);
    z-index: 1001;
    background-color: var(--bg-primary);
    border: none;
    display: none;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.mobile-menu-btn svg {
    width: 20px;
    height: 20px;
    color: var(--text-primary);
}

.mobile-menu-btn.hidden {
  display: none !important;
}

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
    display: none;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.sidebar-overlay.visible {
    opacity: 1;
}

@media screen and (max-width: 768px) {

    .mobile-menu-btn {
        display: flex;
    }

    .mobile-menu-btn {
        top: 17px;
        left: 20px;
    }

    body {
        overflow: hidden;
    }

    #sidebar {
        position: fixed;
        top: 0;
        left: -320px;
        width: 280px;
        height: 100vh;
        z-index: 1000;
        transition: left var(--transition-normal);
        box-shadow: var(--shadow-lg);
    }

    #sidebar.mobile-open {
        left: 0;
    }

    
    .main-content {
        width: 100%;
        margin-left: 0;
    }

    
    .top-bar {
        padding: var(--space-sm) var(--space-md);
        padding-left: 70px; 
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 100;
    }

    
    #messagesContainer {
        position: fixed;
        left: 0;
        right: 0;
        top: 40px;
        padding: 0 var(--space-sm);
        z-index: 99;
    }

    
    .message {
        max-width: 95%;
        margin-bottom: var(--space-md);
    }

    .message.user {
        max-width: 90%;
        padding-left: 5%;
    }

    .message.ai {
        width: 95%;
    }

    .message-content {
        padding: var(--space-sm) var(--space-md);
    }

    .message-content p {
        font-size: 16px; 
    }

    .message.user .message-content {
        font-size: 16px;
        padding: var(--space-sm) var(--space-md);
    }

    
    #inputArea {
        position: fixed;
        left: 0;
        right: 0;
        bottom: 0;
        padding: var(--space-sm);
        z-index: 100;
    }

    #inputArea.centered {
        width: 100%;
        margin: 0;
    }

    .input-container {
        width: 100%;
        padding: var(--space-xs);
    }

    #messageInput {
        font-size: var(--font-size-sm);
        padding: var(--space-sm);
    }

    #sendBtn {
        width: 36px;
        height: 36px;
        min-width: 36px;
    }

    #sendBtn svg {
        width: 16px;
        height: 16px;
    }

    
    #welcomeScreen {
        padding: var(--space-lg) var(--space-md);
    }

    .welcome-title {
        font-size: var(--font-size-lg);
        margin-bottom: var(--space-sm);
    }

    .welcome-subtitle {
        font-size: 16px;
        margin-bottom: var(--space-lg);
    }

    
    .message-content ol,
    .message-content ul {
        font-size: 16px;
        padding-left: 1.2em;
    }

    .message-content ol li,
    .message-content ul li {
        font-size: 16px;
        margin-bottom: 0.3em;
    }

    
    .message-content table {
        font-size: 14px;
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }

    .message-content th,
    .message-content td {
        padding: 8px 10px;
        font-size: 14px;
    }

    
    .ai-btns {
        gap: 4px;
        margin-top: 4px;
    }

    .icon-btn {
        font-size: 0.9rem;
        padding: 2px;
    }

    .report-btn {
        font-size: 12px;
        padding: 4px 8px;
    }

    
    .modal-content {
        width: 90%;
        max-width: 350px;
        padding: var(--space-lg);
    }

    .modal-title {
        font-size: var(--font-size-md);
    }

    #reportComment {
        font-size: 16px;
    }

    
    @media screen and (max-width: 480px) {
        .mobile-menu-btn {
            top: 17px;
            left: 20px;
        }

        .top-bar {
            padding-left: 60px;
        }

        #sidebar {
            width: 260px;
            left: -260px;
        }

        .message-content p {
            font-size: 15px;
        }

        .message.user .message-content {
            font-size: 15px;
        }

        .welcome-title {
            font-size: var(--font-size-md);
        }

        .welcome-subtitle {
            font-size: 14px;
        }
    }
}


@media screen and (min-width: 769px) and (max-width: 1024px) {

    
    .mobile-menu-btn {
        display: flex;
    }

    #sidebar {
        position: fixed;
        left: -320px;
        z-index: 1000;
        transition: left var(--transition-normal);
    }

    #sidebar.mobile-open {
        left: 0;
    }

    .main-content {
        width: 100%;
    }

    .top-bar {
        padding-left: 70px;
    }

    .message.user {
        max-width: 75%;
    }

    .message.ai {
        width: 75%;
    }

    #inputArea.centered {
        width: 60%;
    }
}