:root {
    --bg: #f3f5ff;
    --card: #f6edf3;
    --text: #4b64f1;
    --muted: #b9bfdc;
    --stroke: rgba(255, 255, 255, .18);
    --stroke2: rgba(255, 255, 255, .35);
    --accent: #8bd3ff;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: radial-gradient(1200px 600px at 50% 0%, #929fec 0%, var(--bg) 55%);
    color: var(--text);
    font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    height: 100vh;
}

.app {
    max-width: 980px;
    margin: 0 auto;
    padding: 24px 16px 48px;
}

.title {
    margin: 0 0 6px;
    font-size: 32px;
    letter-spacing: .2px;
}

.subtitle {
    margin: 0 0 18px;
    color: var(--text);
}

.stringCard {
    position: relative;
    background: linear-gradient(180deg, rgba(255, 255, 255, .05), rgba(255, 255, 255, .03));
    border: 1px solid var(--stroke);
    border-radius: 18px;
    padding: 16px;
    box-shadow: 0 18px 50px rgba(0, 0, 0, .35);
}

/* Canvas tekenen we de snaar in */
.stringCanvas {
    width: 100%;
    height: 220px;
    display: block;
    border-radius: 14px;
    /* background: linear-gradient(180deg, rgba(255, 255, 255, .04), rgba(255, 255, 255, .02)); */
    border: 1px solid var(--stroke);
    background: linear-gradient(rgba(197, 188, 247, .4), rgba(255, 255, 255, .2));
}

/*
  Slider “als snaar”:
  - we maken hem onzichtbaar (appearance: none; opacity: 0)
  - leggen hem exact over de snaar heen met absolute positioning
  - hij vangt wel de input (draggen over de snaar)
*/
.stringSlider {
    position: absolute;
    left: 16px;
    right: 16px;

    /* Op het canvas ligt de snaar ongeveer in het midden */
    top: 16px;
    height: 220px;

    margin: 0;
    opacity: 0;
    cursor: grab;
    -webkit-appearance: none;
    appearance: none;
}

.stringSlider:active {
    cursor: grabbing;
}

/* Readout */
.readout {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 12px;
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid var(--stroke);
    background: rgba(0, 0, 0, .15);
}

.label {
    color: var(--muted);
    margin-right: 8px;
}

.value {
    font-weight: 700;
    color: var(--accent);
}

.hint {
    color: var(--text);
    font-size: 14px;
}

.actions {
    display: flex;
    gap: 10px;
    margin-top: 12px;
}

.btn {
    border: 1px solid var(--stroke2);
    background: rgba(255, 255, 255, .06);
    color: var(--text);
    padding: 10px 12px;
    border-radius: 12px;
    cursor: pointer;
}

.btn:hover {
    background: rgba(255, 255, 255, .10);
}

.btn.secondary {
    opacity: .9;
}