.header{

    display:flex;

    justify-content:space-between;

    align-items:center;

    padding:20px 30px;

    background:var(--bg-panel);

    border-bottom:1px solid var(--border);

    box-shadow:var(--shadow);
}

.logo{

    font-size:1.8rem;

    font-weight:700;

    color:var(--primary);

    letter-spacing:2px;
}

.global-controls{

    display:flex;

    align-items:center;

    gap:15px;
}

.global-controls button{

    width:45px;

    height:45px;

    border:none;

    border-radius:50%;

    cursor:pointer;

    color:white;

    background:var(--secondary);

    font-size:1.2rem;
}

#octaveDisplay{

    min-width:80px;

    text-align:center;

    font-weight:bold;
}

main{

    padding:20px;

    display:flex;

    flex-direction:column;

    gap:20px;
}

.oscillator-grid{

    display:grid;

    grid-template-columns:
        repeat(
            auto-fit,
            minmax(350px,1fr)
        );

    gap:20px;
}

.master-panel{

    background:var(--bg-panel);

    border-radius:var(--radius);

    padding:20px;

    box-shadow:var(--shadow);
}

.master-grid{

    display:grid;

    grid-template-columns:
        repeat(
            auto-fit,
            minmax(250px,1fr)
        );

    gap:20px;

    margin-bottom:20px;
}