:root {
        --signal-blue-dark: #2c6bed;
        --signal-footer-bg: #333333;
        --signal-text-dark: #333;
    }

    .navbar-brand { font-weight: 700; color: var(--signal-text-dark) !important; }
    .navbar-brand img { height: 43px; width: auto; }
    .navbar-toggler {
        border: none !important;
        box-shadow: none !important; 
    }

    .download-container { padding: 0px 0; }
    .download-box {
        border-radius: 12px;
        padding: 40px 20px;
        min-height: 550px; 
        text-align: center;
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .download-box h2 { font-size: 2rem; font-weight: 700; }

    .download-img-placeholder {
        max-height: 300px; 
        width: 100%;
        margin-bottom: 20px;
        border-radius: 8px;
        display: flex;
        justify-content: center;
        align-items: center;
        overflow: hidden; 
        padding: 20px 0; 
    }
    .download-img-placeholder img {
        max-width: 100%;
        height: auto;
    }

    .btn-group-os .btn, 
    .btn-signal-download {
        border-radius: .3rem !important; 
        /* font-weight: bold; */
        background-color: var(--signal-blue-dark) !important;
        border-color: var(--signal-blue-dark) !important;
        padding: 10px 30px !important; 
    }

    .btn-group-os .btn {
        margin: 0 5px;
    }

    .btn-signal-download {
        margin-bottom: 30px; 
    }

    .desktop-note {
        background-color: #f0f0f0 !important; 
        padding: 15px !important;
        border-radius: .3rem !important;
        text-align: center;
        margin-top: -20px !important; 
        font-size: 0.9rem !important;
        max-width: none !important;
        width: 100% !important; 
    }
    .desktop-note small {
        color: var(--signal-text-dark) !important; 
        font-weight: 400 !important;
    }

    .link-install-note {
        pointer-events: auto !important; 
        cursor: pointer !important;
        color: #2942ff !important; 
        text-decoration: none; 
        display: inline;
    }

    .link-install-note:hover,
    .link-install-note:active {
        color: #2942ff !important;
        text-decoration: underline;
    }

    .footer-section {
        background-color: var(--signal-footer-bg);
        color: #ccc;
        padding: 40px 0;
        font-size: 0.85rem;
        text-align: center;
    }
    .footer-section a { color: #fff; }

    @media (max-width: 768px) {
        .btn-group-os {
            display: flex;
            flex-direction: column; 
            align-items: center; 
            width: 100%; 
        }

        .btn-group-os .btn {
            margin: 0 0 10px 0 !important; 
            width: 80%; 
            max-width: 250px; 
        }
    }