.trace-hero,
.trace-pattern-card,
.trace-controls,
.trace-options-card,
.trace-readout,
.trace-chart-wrap {
    border: 1px solid rgba(74, 222, 128, 0.18);
    border-radius: 16px;
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.02)),
        rgba(0, 0, 0, 0.26);
}

.trace-hero {
    margin: 8px 0 12px;
    padding: 12px 16px;
}

.trace-hero h2 {
    margin: 0 0 4px;
    color: #bae6fd;
    font-size: 1.35rem;
}

.trace-hero p {
    margin: 0;
    color: rgba(255, 255, 255, 0.66);
    font-size: 0.95rem;
}

.trace-pattern-card {
    margin-bottom: 10px;
    padding: 12px;
}

.trace-pattern-card label {
    display: block;
    margin-bottom: 8px;
    color: rgba(255, 255, 255, 0.68);
    font-size: 0.68rem;
    font-weight: 900;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

/* Sizing only; the look comes from the shared .text-input */
#patternInput {
    width: 100%;
    box-sizing: border-box;
    font-family: 'SF Mono', 'Consolas', 'Monaco', monospace;
    font-size: 1.05rem;
}

.trace-pattern-help {
    margin-top: 7px;
    color: rgba(255, 255, 255, 0.52);
    font-size: 0.82rem;
}

.trace-play-toggle {
    width: fit-content;
    margin-top: 10px;
}

/* Primary controls (Start/Reset, key, scale type) dock onto the top of
   the chart: no gap, joined borders, one visual unit with the display. */
.trace-controls {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin: 0;
    padding: 10px;
    border-bottom: none;
    border-radius: 16px 16px 0 0;
}

.trace-controls-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.trace-scale-row .vf-btn {
    flex: 1 1 auto;
}

.trace-range-row {
    padding-top: 2px;
}

.trace-range-help {
    flex: 1 1 220px;
    color: rgba(255, 255, 255, 0.55);
    font-size: 0.78rem;
    line-height: 1.25;
}

.trace-chart-wrap {
    overflow: hidden;
    margin-bottom: 0;
    padding: 0;
    border-radius: 0;
    background: rgba(0, 0, 0, 0.48);
}

#traceCanvas {
    display: block;
    width: 100%;
    height: 430px;
}

/* Live readout docks onto the bottom of the chart. */
.trace-readout {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 14px;
    margin-bottom: 10px;
    padding: 8px 10px;
    border-top: none;
    border-radius: 0 0 16px 16px;
    color: rgba(255, 255, 255, 0.72);
    font-family: 'SF Mono', 'Consolas', 'Monaco', monospace;
}

#pitchReadout {
    color: #e0f2fe;
    font-weight: 900;
}

/* Secondary options (guide interval/sound, window toggles) live below. */
.trace-options-card {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin: 0 0 14px;
    padding: 8px 10px;
}

@media (max-width: 700px) {
    .trace-controls-row .play-button,
    .trace-controls-row .secondary-btn {
        flex: 1 1 auto;
    }

    #traceCanvas {
        height: 360px;
    }
}