/* ============================================================================
 * Beat Maker
 * Design tokens from main.css. One app-local token: --bm-playhead.
 * ============================================================================ */

:root {
    --bm-playhead: rgba(79, 70, 229, 0.14);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bm-playhead: rgba(129, 140, 248, 0.18);
    }
}

[data-theme="dark"] {
    --bm-playhead: rgba(129, 140, 248, 0.18);
}

/* --------------------------------------------------------------------------
 * Toolbar
 * -------------------------------------------------------------------------- */

.bm-toolbar {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    padding: var(--space-3);
    margin-bottom: var(--space-4);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.bm-toolbar__row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2);
}

.bm-toolbar__group {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.bm-toolbar__label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    font-weight: 600;
}

.bm-select,
.bm-tempo {
    min-height: 44px;
    padding: 0 var(--space-2);
    font-size: var(--font-size-base);
    color: var(--color-text);
    background: var(--color-bg);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-md);
}

.bm-tempo {
    width: 5.5rem;
    text-align: center;
}

.bm-tempo-readout {
    min-width: 3.5rem;
    font-variant-numeric: tabular-nums;
    font-weight: 700;
    color: var(--color-primary-text);
    font-size: var(--font-size-lg);
}

/* Hero Play button */
.bm-play {
    min-height: 44px;
    min-width: 96px;
    padding: 0 var(--space-3);
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-text-inverse);
    background: var(--color-primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.bm-play:hover {
    background: var(--color-primary-dark);
}

.bm-play:focus-visible {
    outline: 3px solid var(--color-primary-text);
    outline-offset: 2px;
}

/* Toggle buttons (loop, mute) */
.bm-toggle {
    min-height: 44px;
    min-width: 44px;
    padding: 0 var(--space-3);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.bm-toggle[aria-pressed="true"] {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-text-inverse);
}

.bm-toggle:focus-visible {
    outline: 3px solid var(--color-primary-text);
    outline-offset: 2px;
}

/* Action buttons */
.bm-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.bm-action {
    min-height: 44px;
    padding: 0 var(--space-3);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.bm-action:hover {
    background: var(--color-bg);
    border-color: var(--color-primary-text);
}

.bm-action--primary {
    background: var(--color-primary-text);
    border-color: var(--color-primary-text);
    color: var(--color-text-inverse);
}

.bm-action--primary:hover {
    background: var(--color-primary-text-hover);
    border-color: var(--color-primary-text-hover);
}

.bm-action:focus-visible,
.bm-help-btn:focus-visible {
    outline: 3px solid var(--color-primary-text);
    outline-offset: 2px;
}

.bm-help-btn {
    min-height: 44px;
    min-width: 44px;
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-primary-text);
    background: transparent;
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-full);
    cursor: pointer;
}

/* Feedback + flash */
.bm-feedback {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.bm-flash {
    min-height: 1.25rem;
    margin-top: var(--space-2);
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--color-success-text);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.bm-flash--show {
    opacity: 1;
}

.bm-audio-note {
    margin-top: var(--space-2);
    font-size: var(--font-size-sm);
    color: var(--color-warning-text);
}

/* --------------------------------------------------------------------------
 * Track cards
 * -------------------------------------------------------------------------- */

.bm-track {
    margin-bottom: var(--space-4);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.bm-track__header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    border-bottom: 1px solid var(--color-border);
}

.bm-track__name {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text);
    margin-right: auto;
}

.bm-track__controls {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.bm-volume {
    width: 9rem;
    accent-color: var(--color-primary);
    min-height: 44px;
}

/* Mute dims the grid body, not the header */
.bm-track--muted .bm-grid,
.bm-track--muted .bm-piano,
.bm-track--muted .bm-chord-grid {
    opacity: 0.4;
    pointer-events: none;
}

/* --------------------------------------------------------------------------
 * Sequencer grids (drums + bass)
 * -------------------------------------------------------------------------- */

.bm-scroll {
    overflow-x: auto;
}

.bm-grid {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: var(--space-2);
    min-width: 620px;
}

.bm-grid__row {
    display: grid;
    grid-template-columns: 6rem repeat(16, minmax(2.25rem, 1fr));
    gap: 2px;
}

.bm-gridcell {
    display: block;
}

/* --------------------------------------------------------------------------
 * CLS reservation — grids/chips are built by JS. Reserve their filled height
 * up-front (rows are fixed-height horizontal strips, so these values are
 * width-independent) so the empty -> filled transition causes no layout shift.
 * -------------------------------------------------------------------------- */
#bm-drum-grid {
    min-height: 218px;
}

#bm-bass-grid {
    min-height: 371px;
}

#bm-piano {
    min-height: 906px;
}

#bm-chord-grid {
    min-height: 66px;
}

#bm-chord-chips {
    min-height: 44px;
}

.bm-grid__label {
    position: sticky;
    left: 0;
    z-index: 2;
    display: flex;
    align-items: center;
    padding: 0 var(--space-2);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
    background: var(--color-bg-card);
}

.bm-cell {
    min-height: 44px;
    padding: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg-alt);
    color: transparent;
    cursor: pointer;
    position: relative;
    font-size: var(--font-size-xs);
    font-weight: 700;
    transition: transform var(--transition-fast), background-color var(--transition-fast);
}

.bm-cell:active {
    transform: scale(0.98);
}

.bm-cell:focus-visible {
    outline: 3px solid var(--color-primary-text);
    outline-offset: -3px;
    z-index: 1;
}

/* Beat grouping: stronger border + beat-1 accent every 4 steps */
.bm-cell--beat4 {
    border-left-width: 3px;
    border-left-color: var(--color-border-dark);
}

.bm-cell--beat1 {
    border-left-color: var(--color-primary-text);
}

.bm-cell--on {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

.bm-cell--on::after {
    content: "";
    position: absolute;
    inset: 0;
    margin: auto;
    width: 8px;
    height: 8px;
    border-radius: var(--radius-full);
    background: var(--color-text-inverse);
}

.bm-cell--playhead {
    background: var(--bm-playhead);
}

.bm-cell--on.bm-cell--playhead {
    background: var(--color-primary-dark);
}

/* --------------------------------------------------------------------------
 * Piano roll
 * -------------------------------------------------------------------------- */

.bm-piano {
    display: flex;
    flex-direction: column;
    gap: 1px;
    padding: var(--space-2);
    min-width: 520px;
}

.bm-piano__row,
.bm-piano__headrow {
    display: grid;
    grid-template-columns: 5rem repeat(16, minmax(1.9rem, 1fr));
    gap: 1px;
}

.bm-piano__corner {
    position: sticky;
    left: 0;
    z-index: 3;
    background: var(--color-bg-card);
}

.bm-piano__step {
    text-align: center;
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    padding: 4px 0;
}

.bm-piano__rowlabel {
    position: sticky;
    left: 0;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 0 var(--space-2);
    font-size: var(--font-size-xs);
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--color-text);
    background: var(--color-bg-card);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}

.bm-piano__rowlabel--black {
    background: var(--color-bg-alt);
    color: var(--color-text-muted);
}

.bm-piano__cell {
    min-height: 30px;
    padding: 0;
    border: 1px solid var(--color-border);
    border-radius: 2px;
    background: var(--color-bg);
    cursor: pointer;
    position: relative;
}

.bm-piano__cell:focus-visible {
    outline: 2px solid var(--color-primary-text);
    outline-offset: -2px;
    z-index: 1;
}

.bm-piano__cell--beat4 {
    border-left-width: 2px;
    border-left-color: var(--color-border-dark);
}

.bm-piano__cell--on {
    background: var(--color-primary);
}

.bm-piano__cell--on.bm-piano__cell--playhead {
    background: var(--color-primary-dark);
}

/* Off-scale rows are faded and non-interactive when snap is on */
.bm-piano--snap .bm-piano__cell--offscale {
    opacity: 0.28;
    cursor: not-allowed;
}

.bm-piano__cell--playhead {
    box-shadow: inset 0 0 0 2px var(--bm-playhead);
}

/* --------------------------------------------------------------------------
 * Chords
 * -------------------------------------------------------------------------- */

.bm-chord-panel {
    margin-bottom: var(--space-4);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: var(--space-3);
}

.bm-chord-panel__title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--space-2);
}

.bm-chord-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
}

.bm-chord-chip {
    min-height: 44px;
    min-width: 3.5rem;
    padding: 0 var(--space-3);
    font-size: var(--font-size-base);
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--color-text);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.bm-chord-chip:hover {
    background: var(--color-bg);
    border-color: var(--color-primary-text);
}

.bm-chord-chip:focus-visible {
    outline: 3px solid var(--color-primary-text);
    outline-offset: 2px;
}

.bm-chord-chip--selected {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-text-inverse);
}

.bm-chord-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(7rem, 1fr));
    gap: var(--space-2);
}

.bm-chord-slot {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.bm-chord-slot__label {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    font-weight: 600;
}

.bm-chord-slot__btn {
    min-height: 44px;
    padding: 0 var(--space-2);
    font-size: var(--font-size-base);
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--color-text-muted);
    background: var(--color-bg-alt);
    border: 1px dashed var(--color-border-dark);
    border-radius: var(--radius-md);
    cursor: pointer;
}

.bm-chord-slot__btn--assigned {
    color: var(--color-text);
    background: var(--color-bg);
    border-style: solid;
    border-color: var(--color-primary-text);
}

.bm-chord-slot__btn--playhead {
    box-shadow: inset 0 0 0 3px var(--bm-playhead);
}

.bm-chord-slot__btn:focus-visible {
    outline: 3px solid var(--color-primary-text);
    outline-offset: 2px;
}

/* --------------------------------------------------------------------------
 * Reduced motion
 * -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
    .bm-cell,
    .bm-piano__cell,
    .bm-chord-chip,
    .bm-action,
    .bm-toggle {
        transition: none;
    }

    .bm-cell--on,
    .bm-cell:active {
        transform: none;
    }
}