.beats-panel {
    position: relative;
}

/* Transport row */

.controls {
    display: flex;
    align-items: center;
    gap: 1.4rem;
    flex-wrap: wrap;
    margin: 1rem 0 1.5rem;
}

.transport-stack {
    position: relative;
    width: 10rem;
    height: 3.6rem;
    flex: 0 0 auto;
}

.transport-stack .transport-button {
    position: absolute;
    inset: 0;
}

.transport-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    min-width: 10rem;
    height: 3.6rem;
    padding: 0 1.5rem;
    border: 1px solid #666;
    border-radius: 12px;
    background: #2b2928;
    color: #fff;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .15s ease, visibility .15s ease, background .15s ease;
}

.transport-button.active-button {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.transport-button.active-button:hover {
    background: #383533;
}

.transport-svg {
    width: 24px;
    height: 24px;
    flex: 0 0 24px;
    fill: currentColor;
    display: block;
}

#play-button,
#stop-button {
    color: #fff;
}

#play-button .transport-svg {
    color: #b8f0c0;
}

#stop-button .transport-svg {
    color: #f0b8b8;
}

/* Toolbar controls */

.beats-icon {
    width: 22px;
    height: 22px;
    flex: 0 0 22px;
    color: currentColor;
    display: inline-block;
}

.icon-control {
    color: #d7dce5;
}

.bpm-control,
.timing-control,
.lead-in-option,
.repeat-option {
    display: inline-flex;
    align-items: center;
    gap: .45rem;
    white-space: nowrap;
}

#bpm-input {
    width: 3.8rem;
}

.timing-control select {
    font: inherit;
    background: #252525;
    color: #fff;
    border: 1px solid #555;
    border-radius: 8px;
    padding: .45rem .6rem;
}

.timing-control .beats-icon {
    width: 28px;
    height: 28px;
}

.icon-only-option {
    color: #d7dce5;
    cursor: pointer;
}

.repeat-option .beats-icon {
    width: 22px;
    height: 22px;
}

.lead-in-option {
    color: #d7dce5;
    cursor: pointer;
}

.lead-in-option span {
    font-size: .95rem;
}


/* Shared buttons */

.page-button,
.small-action-button,
.structure-name-button,
.structure-delete-button,
.structure-item-button,
.structure-add-button,
.structure-add-select select {
    border: 1px solid #555;
    border-radius: 8px;
    background: #252525;
    color: #fff;
    padding: 0.45rem 0.75rem;
    cursor: pointer;
}

.page-button:hover,
.small-action-button:hover,
.structure-name-button:hover,
.structure-delete-button:hover,
.structure-item-button:hover,
.structure-add-button:hover,
.structure-add-select select:hover {
    background: #333;
}

.page-button.active,
.structure-name-button.active {
    background: #ddd;
    color: #111;
    border-color: #fff;
    box-shadow:
        inset 0 0 10px rgba(120,170,255,0.35),
        0 0 8px rgba(120,170,255,0.3);
}

.page-button.playing-pattern,
.structure-item-button.playing-structure,
.structure-name-button.playing-structure {
    border-color: rgba(255,255,255,0.95);
    box-shadow:
        inset 0 0 12px rgba(120,170,255,0.55),
        0 0 12px rgba(120,170,255,0.5);
}

/* Bar controls */

.page-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 0 0 1.25rem;
    flex-wrap: wrap;
}

.page-label {
    color: #aaa;
    font-size: 0.95rem;
}

.page-buttons {
    display: flex;
    gap: 0.45rem;
    flex-wrap: wrap;
}

/* Sequencer */

.sequencer {
    overflow-x: auto;
}

.seq-grid {
    display: grid;
    gap: 6px;
    align-items: center;
}

.seq-label,
.seq-step-header {
    color: #aaa;
    font-size: 0.85rem;
}

.seq-label {
    text-align: right;
    padding-right: 0.5rem;
}

.seq-step {
    --instrument-color: #d7dce5;
    width: 42px;
    height: 42px;
    border: 1px solid #555;
    border-radius: 9px;
    background: linear-gradient(145deg, #2f2f2f, #1f1f1f);
    box-shadow:
        inset 1px 1px 1px rgba(255,255,255,0.08),
        inset -2px -2px 3px rgba(0,0,0,0.45),
        0 2px 3px rgba(0,0,0,0.35);
    cursor: pointer;
}

.seq-step:hover {
    background: linear-gradient(145deg, #373737, #242424);
}

.seq-step.active {
    background:
        radial-gradient(circle at 35% 30%, rgba(255,255,255,0.45), transparent 38%),
        linear-gradient(145deg, color-mix(in srgb, var(--instrument-color) 42%, #2f2f2f), #1f1f1f);
    border-color: color-mix(in srgb, var(--instrument-color) 65%, #ffffff);
    box-shadow:
        inset 0 0 14px color-mix(in srgb, var(--instrument-color) 45%, transparent),
        inset 1px 1px 1px rgba(255,255,255,0.35),
        inset -2px -2px 3px rgba(0,0,0,0.35),
        0 0 8px color-mix(in srgb, var(--instrument-color) 35%, transparent);
}

.seq-step.active:hover {
    background:
        radial-gradient(circle at 35% 30%, rgba(255,255,255,0.55), transparent 38%),
        linear-gradient(145deg, color-mix(in srgb, var(--instrument-color) 55%, #333), #222);
}

.seq-step.playing {
    outline: 2px solid rgba(255,255,255,0.85);
    outline-offset: 2px;
}

.seq-step.active.playing {
    background:
        radial-gradient(circle at 35% 30%, rgba(255,255,255,0.95), transparent 45%),
        linear-gradient(145deg, #ffffff, #dcdcdc);
    box-shadow:
        inset 0 0 14px rgba(255,255,255,0.85),
        0 0 14px rgba(255,255,255,0.75);
}

.seq-step.beat {
    border-color: #777;
}

/* Structure accordion */

.builder-accordion {
    margin-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.12);
}

.builder-section {
    border-bottom: 1px solid rgba(255,255,255,0.10);
}

.builder-toggle {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: .8rem 0;
    border: 0;
    background: transparent;
    color: #d7dce5;
    font: inherit;
    font-weight: 700;
    cursor: pointer;
}

.builder-toggle:hover,
.builder-section.open .builder-toggle {
    color: #fff;
}

.builder-panel {
    padding: 0 0 1rem;
}

.builder-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    justify-content: space-between;
    margin-bottom: .75rem;
}

.builder-hint {
    margin: 0;
    color: #aaa;
    font-size: .92rem;
}

.builder-actions {
    display: flex;
    justify-content: flex-start;
    margin: 0 0 .85rem;
}

.structure-list {
    display: grid;
    gap: .6rem;
}

.structure-row {
    display: grid;
    grid-template-columns: minmax(210px, auto) 1fr;
    gap: .75rem;
    align-items: center;
}

.structure-tools {
    display: flex;
    align-items: center;
    gap: .35rem;
}

.structure-name-button {
    min-width: 8rem;
    text-align: left;
}

.structure-delete-button {
    width: 2.4rem;
    padding-left: 0;
    padding-right: 0;
    text-align: center;
}

.structure-items {
    display: flex;
    align-items: center;
    gap: .45rem;
    flex-wrap: wrap;
}

.structure-items.vertical {
    display: grid;
    grid-template-columns: 1fr;
    justify-items: start;
    align-items: start;
}

.structure-token {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
}

.structure-items.vertical .structure-token {
    display: flex;
    width: min(22rem, 100%);
}

.structure-items.vertical .structure-item-button {
    width: 100%;
    text-align: left;
}

.structure-token.dragging {
    opacity: .45;
}

.structure-item-button.selected {
    border-color: #fff;
    box-shadow:
        inset 0 0 10px rgba(120,170,255,0.45),
        0 0 10px rgba(120,170,255,0.4);
}

.structure-add-select {
    display: inline-flex;
    align-items: center;
}

.structure-add-select select {
    font: inherit;
    min-width: 7rem;
}

.structure-name-editor {
    min-width: 8rem;
    max-width: 12rem;
    height: 2.45rem;
    border: 1px solid #8aa9ff;
    border-radius: 8px;
    background: #f1f3f8;
    color: #111;
    padding: 0 .75rem;
    font: inherit;
    box-shadow:
        inset 0 0 10px rgba(120,170,255,0.25),
        0 0 8px rgba(120,170,255,0.3);
}

/* Statistics */

.beats-stats-panel {
    margin-top: 1.25rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255,255,255,0.10);
}

.beats-stats {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: .65rem 1rem;
    color: #cfd6e3;
    font-size: .92rem;
}

.beats-stats span {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
}

.beats-stats strong {
    color: #aaa;
    font-weight: 600;
}

/* Help */

.beats-help-button {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    width: 2rem;
    height: 2rem;
    border: 1px solid #666;
    border-radius: 50%;
    background: #2b2928;
    color: #fff;
    font-weight: 700;
    cursor: pointer;
}

.beats-help-button:hover {
    background: #383533;
}

.beats-modal[hidden] {
    display: none;
}

.beats-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
}

.beats-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.65);
}

.beats-modal-panel {
    position: relative;
    z-index: 1001;
    width: min(90vw, 420px);
    margin: 10vh auto;
    padding: 1.5rem;
    background: #172231;
    border: 1px solid #46566c;
    border-radius: 16px;
    color: #fff;
}

.beats-modal-close {
    position: absolute;
    top: 0.8rem;
    right: 0.8rem;
    border: 0;
    background: transparent;
    color: #fff;
    font-size: 1.6rem;
    cursor: pointer;
}

.shortcut-list {
    display: grid;
    grid-template-columns: max-content 1fr;
    gap: 0.65rem 1rem;
}

.shortcut-list dt {
    font-weight: 700;
    color: #fff;
}

.shortcut-list dd {
    margin: 0;
    color: #d7dce5;
}

/* Status */

.status {
    margin-top: 1.5rem;
    color: #aaa;
}

/* Transport diagnostics */
.beats-stats-summary,
.beats-transport-debug {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: .65rem 1rem;
}

.beats-transport-debug {
    margin-top: .65rem;
    padding-top: .65rem;
    border-top: 1px solid rgba(255,255,255,0.08);
    color: #cfd6e3;
}

.beats-queue-inspector {
    margin-top: .8rem;
    color: #cfd6e3;
}

.beats-queue-inspector summary {
    cursor: pointer;
    color: #aaa;
    font-weight: 600;
}

.beats-queue-list {
    display: grid;
    gap: .25rem;
    margin-top: .55rem;
    max-height: 18rem;
    overflow: auto;
    padding-right: .25rem;
}

.beats-queue-row {
    display: grid;
    grid-template-columns: 1.5rem 1fr;
    gap: .35rem;
    align-items: center;
    padding: .25rem .45rem;
    border-radius: 7px;
    background: rgba(255,255,255,0.035);
    font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
    font-size: .86rem;
}

.beats-queue-row.current {
    color: #fff;
    background: rgba(120,170,255,0.18);
    box-shadow:
        inset 0 0 10px rgba(120,170,255,0.25),
        0 0 8px rgba(120,170,255,0.18);
}

.beats-queue-marker {
    color: #b8f0c0;
    text-align: center;
}

.beats-queue-empty {
    color: #aaa;
    font-style: italic;
}

/* Insert controls */
.structure-items > .structure-add-select:first-child {
    margin-right: .15rem;
}

.structure-items.vertical > .structure-add-select:first-child {
    margin-bottom: .2rem;
}

.structure-items.vertical .structure-add-select select {
    width: min(22rem, 100%);
    text-align: left;
}

/* Project persistence */
.project-controls {
    display: flex;
    align-items: center;
    gap: .65rem;
    flex-wrap: wrap;
    margin: .75rem 0 1rem;
}

.project-name-control {
    display: inline-flex;
    align-items: center;
    gap: .55rem;
    color: #cfd6e3;
}

.project-name-control span {
    color: #aaa;
    font-size: .95rem;
}

#project-name-input {
    width: min(26rem, 58vw);
    border: 1px solid #555;
    border-radius: 8px;
    background: #252525;
    color: #fff;
    padding: .45rem .75rem;
    font: inherit;
}

#project-name-input:focus {
    outline: 2px solid rgba(120,170,255,0.55);
    outline-offset: 2px;
}


/* Dirty state */
.small-action-button:disabled,
.small-action-button.is-disabled {
    opacity: .42;
    cursor: default;
    filter: grayscale(.45);
}

.small-action-button:disabled:hover,
.small-action-button.is-disabled:hover {
    background: #252525;
}

.project-name-control.dirty span::after {
    content: ' *';
    color: #ffd27a;
    font-weight: 700;
}

.project-name-control.dirty #project-name-input {
    border-color: rgba(255,210,122,0.7);
    box-shadow: 0 0 8px rgba(255,210,122,0.18);
}


/* Dialogs */

body.beats-dialog-open {
    overflow: hidden;
}

.beats-dialog-overlay {
    position: fixed;
    inset: 0;
    z-index: 1200;
    display: grid;
    place-items: center;
    padding: 1.5rem;
    background: rgba(0,0,0,0.66);
}

.beats-dialog {
    width: min(92vw, 440px);
    border: 1px solid rgba(180,195,220,0.35);
    border-radius: 16px;
    background: #172231;
    color: #fff;
    box-shadow:
        0 24px 70px rgba(0,0,0,0.55),
        inset 0 1px 0 rgba(255,255,255,0.08);
}

.beats-dialog-title {
    margin: 0;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid rgba(255,255,255,0.10);
    font-size: 1.1rem;
}

.beats-dialog-message {
    padding: 1.2rem 1.25rem;
    color: #d7dce5;
}

.beats-dialog-message p {
    margin: 0;
}

.beats-dialog-message p + p {
    margin-top: .75rem;
}

.beats-dialog-actions {
    display: flex;
    justify-content: flex-end;
    gap: .75rem;
    padding: 0 1.25rem 1.2rem;
}

.beats-dialog-button {
    border: 1px solid #555;
    border-radius: 8px;
    background: #252525;
    color: #fff;
    padding: .55rem .95rem;
    cursor: pointer;
}

.beats-dialog-button:hover,
.beats-dialog-button:focus {
    background: #333;
}

.beats-dialog-button.primary {
    border-color: rgba(184,240,192,0.7);
    box-shadow: 0 0 10px rgba(184,240,192,0.15);
}

.beats-dialog-button.danger {
    border-color: rgba(240,184,184,0.75);
    color: #ffd0d0;
    box-shadow: 0 0 10px rgba(240,184,184,0.15);
}