/*
 * Estudo — partitura de bateria (classes bateria-*; geometria da notação em bateria.js)
 */
.bateria-layout {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 1.5rem;
    align-items: start;
}

.bateria-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.bateria-list__btn {
    width: 100%;
    text-align: left;
    font-family: inherit;
    font-size: 0.9rem;
    padding: 0.75rem 0.9rem;
    border: var(--line-width) solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
}

.bateria-list__btn:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

.bateria-list__btn.is-active {
    border-color: var(--text-primary);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-weight: 600;
}

.bateria-list__btn:focus-visible {
    outline: 2px solid var(--link-color);
    outline-offset: 2px;
}

.bateria-list__heading {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-tertiary);
    margin: 0.5rem 0 -0.15rem;
}

.bateria-list__heading:first-child {
    margin-top: 0;
}

.bateria-practice {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    min-width: 0;
}

.bateria-meta {
    padding-bottom: 1rem;
    border-bottom: var(--line-width) solid var(--border-color);
}

.bateria-meta__title {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: var(--text-primary);
}

.bateria-meta__desc {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.55;
    margin-bottom: 1rem;
}

.bateria-transport {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.bateria-play {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: inherit;
    font-size: 0.85rem;
    letter-spacing: 0.02em;
    padding: 0.55rem 1.1rem;
    border: var(--line-width) solid var(--text-primary);
    border-radius: 6px;
    background: var(--text-primary);
    color: var(--bg-primary);
    cursor: pointer;
    transition: opacity 0.15s ease;
}

.bateria-play:disabled {
    opacity: 0.5;
    cursor: wait;
}

.bateria-play:not(:disabled):hover {
    opacity: 0.85;
}

.bateria-play.is-playing .bateria-play__icon-play { display: none; }
.bateria-play:not(.is-playing) .bateria-play__icon-pause { display: none; }

.bateria-bpm {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    flex: 1;
    min-width: 0;
}

.bateria-bpm__label {
    font-size: 0.78rem;
    color: var(--text-tertiary);
    white-space: nowrap;
}

.bateria-bpm__slider {
    flex: 1;
    min-width: 5rem;
    max-width: 14rem;
    accent-color: var(--link-color);
    cursor: pointer;
}

.bateria-bpm__value {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
    min-width: 4.5rem;
    text-align: right;
}

.bateria-shortcuts {
    margin-top: 0.65rem;
    text-align: center;
    font-size: 0.78rem;
    color: var(--text-tertiary);
}

.bateria-shortcuts__groups {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem 1.25rem;
    justify-content: center;
}

.bateria-shortcuts__group {
    display: inline-flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.35rem 0.55rem;
}

.bateria-shortcuts__label {
    font-weight: 600;
    color: var(--text-secondary);
}

.bateria-shortcuts__item {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.bateria-shortcuts kbd {
    display: inline-block;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.7rem;
    line-height: 1.2;
    padding: 0.12rem 0.38rem;
    border: var(--line-width) solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-primary);
    color: var(--text-primary);
}

.bateria-notation {
    border: var(--line-width) solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-secondary);
    padding: 0.75rem;
    overflow-x: auto;
}

.bateria-notation svg {
    display: block;
    width: 100%;
    height: auto;
    min-width: 420px;
}

.bateria-notation svg path,
.bateria-notation svg text {
    transition: fill 0.08s linear, stroke 0.08s linear;
}

.bateria-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.25rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.bateria-legend__item {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.bateria-legend__swatch {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}

.bateria-legend__swatch--outline {
    background: var(--bg-primary);
    border: 1.5px solid var(--text-primary);
}

.bateria-stage {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    border: var(--line-width) solid var(--border-color);
    border-radius: 6px;
    overflow: hidden;
    background: var(--bg-secondary);
}

.bateria-stage canvas {
    display: block;
    width: 100%;
    height: 100%;
    cursor: grab;
    touch-action: none;
}

.bateria-stage canvas:active {
    cursor: grabbing;
}

.bateria-stage__tooltip {
    position: absolute;
    z-index: 2;
    pointer-events: none;
    transform: translate(12px, -28px);
    padding: 0.35rem 0.55rem;
    border-radius: 4px;
    font-size: 0.78rem;
    line-height: 1.2;
    white-space: nowrap;
    color: var(--bg-primary);
    background: var(--text-primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.bateria-stage__tooltip[hidden] {
    display: none;
}

.bateria-stage__debug {
    position: absolute;
    z-index: 2;
    left: 8px;
    bottom: 8px;
    pointer-events: none;
    padding: 0.3rem 0.5rem;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.7rem;
    line-height: 1.2;
    white-space: nowrap;
    color: var(--bg-primary);
    background: var(--text-primary);
    opacity: 0.85;
}

.bateria-stage__fallback {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    font-size: 0.85rem;
    color: var(--text-tertiary);
    text-align: center;
    padding: 1rem;
}

.bateria-code {
    font-size: 0.85rem;
}

.bateria-code summary {
    cursor: pointer;
    color: var(--text-secondary);
}

.bateria-code pre {
    margin-top: 0.75rem;
    padding: 0.9rem 1rem;
    border: var(--line-width) solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-secondary);
    overflow-x: auto;
}

.bateria-code code {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.82rem;
    color: var(--text-primary);
    white-space: pre;
}

@media (max-width: 860px) {
    .bateria-layout {
        grid-template-columns: 1fr;
    }

    .bateria-list {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .bateria-list__btn {
        width: auto;
        flex: 1 1 auto;
    }

    .bateria-list__heading {
        flex-basis: 100%;
    }
}

@media (prefers-reduced-motion: reduce) {
    .bateria-notation svg path,
    .bateria-notation svg text {
        transition: none;
    }
}