.sinus-demo-wrap {
    max-width: 760px;
    margin: 1.5em auto;
}

.sinus-demo-canvas {
    display: block;
    width: 100%;
    max-width: 760px;
    border: 1px solid #777;
    border-radius: 6px;
    background: #f7f7f7;
}

.sinus-demo-controls {
    margin-top: 12px;
    padding: 14px 16px;
    border: 1px solid #777;
    border-radius: 6px;
    background: #e9e9e9;
}

.sinus-demo-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
}

.sinus-demo-label {
    color: #222;
    font-size: 0.95em;
    font-weight: bold;
}

.sinus-demo-input {
    box-sizing: border-box;
    display: block;
    width: 100%;
    margin-top: 5px;
    padding: 7px 8px;
    border: 1px solid #888;
    border-radius: 4px;
    color: #222;
    background: #fff;
    font: inherit;
}

.sinus-demo-message {
    min-height: 1.2em;
    margin-top: 10px;
    color: #555;
    font-size: 0.9em;
}

@media (max-width: 520px) {
    .sinus-demo-grid {
        grid-template-columns: 1fr;
    }
}