.controls { 
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    width: 100%;
}

.control-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 6px;
    background: var(--surface-panel);
    padding: 10px 12px;
    border-radius: 0px;
    border-left: 4px solid var(--deg-third);
    border-top: 1px solid var(--line);
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    width: 100%;
    box-shadow: var(--shadow-panel);
}

.control-row.root-row {
    border-left-color: var(--deg-root);
    background: var(--surface-panel-accent);
}

.control-row.feature-row {
    border-left-color: var(--deg-seventh);
    background: var(--surface-panel-feature);
}

.control-row label {
    width: 100%;
    font-family: 'Oswald', sans-serif;
    font-size: 14px;
    color: var(--text-strong);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 600;
    margin-bottom: 2px;
    text-align: left;
}

.root-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; width: 100%; margin-bottom: 6px; }
.root-head label { width: auto; margin-bottom: 0; }
.naming button { padding: 4px 8px; font-size: 9.5px; letter-spacing: 0.5px; }
.root-selector {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 4px;
    width: 100%;
}

.root-selector button {
    padding: 6px 2px;
    font-size: 11px;
    font-weight: 800;
}

.root-selector button.active {
    background: var(--deg-root);
    color: var(--on-deg-root);
    border-color: var(--deg-root);
    box-shadow: 0 0 8px var(--glow-root);
}

.fret-range-selector {
    display: grid;
    grid-template-columns: 1fr repeat(5, 1fr);
    gap: 3px;
    width: 100%;
}

button { 
    background: var(--surface-control); 
    color: var(--control-ink); 
    border: 1px solid var(--control-border); 
    padding: 8px 4px; 
    cursor: pointer; 
    border-radius: 2px; 
    font-family: 'Montserrat', sans-serif;
    font-size: 10px;
    font-weight: 700;
    transition: all 0.15s ease-in-out;
    letter-spacing: 0.5px;
    text-transform: none;
}
button:hover {
    background: var(--surface-control-hover);
    color: var(--text-strong);
}
button:active { 
    transform: translateY(1px);
}
button.active { 
    background: var(--deg-third); 
    color: var(--on-deg-third); 
    border-color: var(--deg-third);
    box-shadow: var(--shadow-active);
}

button.fret-range-btn.active {
    background: var(--deg-seventh);
    color: var(--on-deg-seventh);
    border-color: var(--deg-seventh);
    box-shadow: 0 0 8px var(--glow-seventh);
    font-weight: 800;
}

button.shell-btn {
    width: 100%;
    padding: 10px;
    font-size: 11px;
    background: var(--surface-control-feature);
    border-color: var(--control-border-feature);
    color: var(--feature-ink-shell);
    font-weight: 800;
}
button.shell-btn:hover {
    background: var(--surface-control-feature-hover);
    color: var(--text-strong);
}
button.shell-btn.active {
    background: var(--deg-seventh);
    color: var(--on-deg-seventh);
    border-color: var(--deg-seventh);
    box-shadow: 0 0 10px var(--glow-seventh);
}

button.arpeggio-btn {
    width: 100%;
    padding: 10px;
    font-size: 11px;
    background: var(--surface-control-feature);
    border-color: var(--control-border-feature);
    color: var(--feature-ink-arpeggio);
    font-weight: 800;
}
button.arpeggio-btn:hover {
    background: var(--surface-control-feature-hover);
    color: var(--text-strong);
}
button.arpeggio-btn.playing {
    background: var(--action);
    color: var(--on-action);
    border-color: var(--action);
    box-shadow: 0 0 12px var(--glow-action);
}

button.clear-btn { 
    background: var(--destructive-bg);
    color: var(--destructive); 
    border: 1px solid var(--destructive-border);
    margin-top: 5px;
    padding: 10px 16px;
    width: 100%;
}
button.clear-btn:hover {
    background: var(--destructive);
    color: var(--on-destructive);
}

/* ---- String sets ---- */
.sub-label.first { margin-top: 0; }
.sub-label { width: 100%; text-align: left; font-size: 9.5px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--group-label); font-weight: 700; margin-top: 6px; }
.string-selector { display: flex; gap: 3px; width: 100%; }
.string-selector .string-btn { flex: 1 1 0; padding: 7px 0; font-size: 12px; font-weight: 800; text-transform: none; }
.string-selector .string-btn.active { background: var(--deg-seventh); color: var(--on-deg-seventh); border-color: var(--deg-seventh); box-shadow: none; }
.string-selector .string-move { flex: 0 0 32px; padding: 7px 0; display: inline-flex; align-items: center; justify-content: center; }
.string-selector .string-move:disabled { opacity: 0.35; cursor: default; }

/* Play across zones: Diagonal | One at a time */
.run-mode { display: flex; align-items: center; justify-content: space-between; gap: 8px; width: 100%; margin-top: 6px; }
.run-mode[hidden] { display: none; }
.sub-label.inline { width: auto; margin: 0; }
.run-mode .vb-seg button { padding: 6px 9px; font-size: 10.5px; white-space: nowrap; }
.run-mode .sub-label.inline { white-space: nowrap; }