.lab {
    max-width: 820px;
    margin: 0 auto 16px;
    padding: 12px;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

h2 {
    text-align: center;
    font-weight: 600;
    letter-spacing: 0.02em;
}

canvas {
    background: #ffffff;
    border: 1px solid #bbb;
    border-radius: 8px;
    display: block;
    margin: 0 auto;
}

.panel {
    max-width: 520px;
    margin: 10px auto 0;
    padding: 16px 18px;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
}

/* grid voor bediening */
.controls-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.controls-left,
.controls-right {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* analyseblok visueel onderscheiden */
.analysis {
    margin-top: 6px;
    padding-top: 6px;
    border-top: 1px solid #ddd;
}

.analysis label {
    display: block;
    font-weight: normal;
    margin-top: 6px;
}


.legend {
    margin-top: 8px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 0.85rem;
    max-width: 420px;
}

.legend-row {
    display: grid;
    grid-template-columns: 20px 1fr 80px;
    align-items: center;
    gap: 8px;
}

.legend input[type="range"] {
    height: 4px;
}

/* standaard worden de basis en toegevoegde kromme niet getoond */
/* Dat wordt getoggled met de "toon componenten"-knop  */
.legend-component {
    display: none;
}

.slider {
    appearance: none;
    height: 4px;
    border-radius: 2px;
    background: #ddd;
    outline: none;
}

.slider::-webkit-slider-thumb {
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

.slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
}

/* Samengestelde golf */
.slider.sum {
    background: linear-gradient(to right, #222 0%, #ddd 0%);
}

.slider.sum::-webkit-slider-thumb {
    background: #222;
}

.slider.sum::-moz-range-thumb {
    background: #222;
}

/* Grondtoon */
.slider.base::-webkit-slider-thumb {
    background: #ec1111;
}

.slider.base::-moz-range-thumb {
    background: #ec1111;
}

/* Toegevoegde golf */
.slider.overtone::-webkit-slider-thumb {
    background: #2a6fdb;
}

.slider.overtone::-moz-range-thumb {
    background: #2a6fdb;
}