/*
 * Estudo — partitura de bateria (classes bateria-*; geometria da notação em bateria.js)
 */
.bateria-layout {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

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

/* --- Hub de estudo --- */
.bateria-study-hub {
    display: flex;
    flex-direction: column;
}

.bateria-study-hub__panel {
    border: var(--line-width) solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-secondary);
    padding: 1rem 1.1rem;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.bateria-study-hub__hint {
    margin: 0;
    font-size: 0.82rem;
    color: var(--text-tertiary);
    line-height: 1.45;
}

.bateria-study-hub__tracks {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.35rem;
    padding: 0.3rem;
    border-radius: 8px;
    background: var(--bg-primary);
    border: var(--line-width) solid var(--border-color);
}

.bateria-study-hub__track {
    font-family: inherit;
    font-size: 0.78rem;
    font-weight: 500;
    padding: 0.55rem 0.5rem;
    border: var(--line-width) solid transparent;
    border-radius: 8px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
    min-height: 4.25rem;
    justify-content: center;
}

.bateria-study-hub__track-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 8px;
    border: var(--line-width) solid var(--border-color);
    background: var(--bg-secondary);
    color: var(--text-tertiary);
    transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}

.bateria-study-hub__track-label {
    line-height: 1.2;
}

.bateria-study-hub__track:hover .bateria-study-hub__track-icon {
    border-color: var(--text-tertiary);
    color: var(--text-secondary);
}

.bateria-study-hub__track:hover {
    color: var(--text-primary);
}

.bateria-study-hub__track.is-active {
    color: var(--text-primary);
    font-weight: 600;
}

.bateria-study-hub__track.is-active .bateria-study-hub__track-icon {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: var(--bg-primary);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.12);
}

[data-theme="dark"] .bateria-study-hub__track.is-active .bateria-study-hub__track-icon {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.bateria-study-hub__items-wrap {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Escada de dificuldade (estilo carreira de Guitar Hero) */
.bateria-study-hub__tier {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.bateria-study-hub__tier + .bateria-study-hub__tier {
    margin-top: 0.4rem;
}

.bateria-study-hub__tier-head {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.bateria-study-hub__tier-title {
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
    white-space: nowrap;
}

.bateria-study-hub__tier-rule {
    flex: 1;
    border-top: var(--line-width) solid var(--border-color);
}

.bateria-study-hub__dots {
    display: inline-flex;
    align-items: center;
    gap: 0.22rem;
    flex-shrink: 0;
}

.bateria-study-hub__dot {
    width: 0.32rem;
    height: 0.32rem;
    border-radius: 50%;
    border: 1px solid var(--text-tertiary);
}

.bateria-study-hub__dot.is-filled {
    background: var(--text-primary);
    border-color: var(--text-primary);
}

.bateria-study-hub__item-meta {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.bateria-study-hub__tier-progress {
    font-size: 0.68rem;
    font-variant-numeric: tabular-nums;
    color: var(--text-tertiary);
    line-height: 1;
}

.bateria-study-hub__tier-progress.is-complete {
    color: var(--text-primary);
    font-weight: 600;
}

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

.bateria-study-hub__item-check {
    display: inline-flex;
    align-items: center;
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.bateria-study-hub__item-check svg {
    display: block;
}

.bateria-study-hub__item:hover .bateria-study-hub__item-check,
.bateria-study-hub__item.is-active .bateria-study-hub__item-check {
    color: var(--text-secondary);
}

.bateria-study-hub__items-label {
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
}

.bateria-study-hub__items {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}

.bateria-study-hub__item {
    display: inline-flex;
    flex-direction: row;
    align-items: center;
    gap: 0.55rem;
    font-family: inherit;
    font-size: 0.85rem;
    padding: 0.5rem 0.75rem;
    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;
    min-width: 5.5rem;
}

.bateria-study-hub__item-body {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.1rem;
}

.bateria-study-hub__item-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--text-secondary);
}

.bateria-study-hub__item-icon svg {
    display: block;
}

.bateria-study-hub__item:hover .bateria-study-hub__item-icon,
.bateria-study-hub__item.is-active .bateria-study-hub__item-icon {
    color: var(--link-color);
}

[data-theme="light"] .bateria-study-hub__item:hover .bateria-study-hub__item-icon,
[data-theme="light"] .bateria-study-hub__item.is-active .bateria-study-hub__item-icon {
    color: #0080ad;
}

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

.bateria-study-hub__item.is-active {
    border-color: var(--text-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
}

.bateria-study-hub__item-name {
    font-weight: 600;
    line-height: 1.2;
}

.bateria-study-hub__item-bpm {
    font-size: 0.68rem;
    font-variant-numeric: tabular-nums;
    color: var(--text-tertiary);
    line-height: 1;
}

.bateria-study-hub__item.is-active .bateria-study-hub__item-bpm {
    color: var(--text-secondary);
}

.bateria-study-hub__track:focus-visible,
.bateria-study-hub__item:focus-visible {
    outline: 2px solid var(--link-color);
    outline-offset: 2px;
}

@media (max-width: 640px) {
    .bateria-study-hub__tracks {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .bateria-study-hub__item {
        flex: 1 1 calc(50% - 0.45rem);
        min-width: 0;
    }
}

/* --- Meta + toolbar --- */
.bateria-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.bateria-control-deck {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1rem 1.1rem;
    border: var(--line-width) solid var(--border-color);
    border-radius: 10px;
    background: var(--bg-secondary);
}

.bateria-control-deck__info {
    min-width: 0;
}

.bateria-meta__header {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.5rem 0.75rem;
    margin-bottom: 0.4rem;
}

.bateria-meta__track {
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-tertiary);
    padding: 0.15rem 0.45rem;
    border: var(--line-width) solid var(--border-color);
    border-radius: 4px;
}

.bateria-meta__title {
    font-size: 1.15rem;
    font-weight: 600;
    margin: 0;
    color: var(--text-primary);
}

.bateria-meta__desc {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.55;
    margin-bottom: 0.5rem;
}

.bateria-meta__tip {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.45;
    margin-bottom: 0.75rem;
}

.bateria-meta__next {
    margin-bottom: 0.75rem;
}

.bateria-meta__next-btn {
    font-family: inherit;
    font-size: 0.82rem;
    color: var(--text-secondary);
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.bateria-meta__next-btn:hover {
    color: var(--text-primary);
}

/* --- Music flow (seções da música) --- */
.bateria-music-flow {
    --flow-accent: var(--link-color, #00BFFF);
    margin: 0;
    padding-top: 0.75rem;
    border-top: var(--line-width) solid var(--border-color);
}

/* O cyan do accent perde contraste em fundo claro (mesmo motivo do toolbar). */
[data-theme="light"] .bateria-music-flow {
    --flow-accent: #0080ad;
}

.bateria-music-flow__header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 0.4rem;
}

.bateria-music-flow__heading {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
}

.bateria-music-flow__total {
    font-size: 0.72rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    color: var(--text-secondary);
}

.bateria-music-flow__wrap {
    position: relative;
}

.bateria-music-flow__track {
    display: flex;
    gap: 0.35rem;
    min-height: 2.1rem;
}

.bateria-music-flow__segment {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 0;
    overflow: hidden;
    appearance: none;
    -webkit-appearance: none;
    font: inherit;
    text-align: center;
    border-radius: 0;
    border: var(--line-width) solid var(--border-color);
    background: var(--bg-primary);
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease;
}

.bateria-music-flow__segment:hover {
    border-color: color-mix(in srgb, var(--flow-accent) 55%, var(--border-color));
    background: color-mix(in srgb, var(--flow-accent) 6%, var(--bg-primary));
}

.bateria-music-flow__segment:focus-visible {
    outline: 2px solid var(--flow-accent);
    outline-offset: 1px;
}

.bateria-music-flow__segment-body {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.05rem;
    padding: 0.15rem 0.45rem;
    min-width: 0;
    max-width: 100%;
}

.bateria-music-flow__segment.is-done {
    border-color: color-mix(in srgb, var(--flow-accent) 45%, var(--border-color));
    background: color-mix(in srgb, var(--flow-accent) 8%, var(--bg-primary));
}

.bateria-music-flow__segment.is-active,
.bateria-music-flow__segment.is-selected {
    border-color: color-mix(in srgb, var(--flow-accent) 80%, var(--border-color));
    background: color-mix(in srgb, var(--flow-accent) 14%, var(--bg-primary));
}

.bateria-music-flow__label {
    font-size: 0.68rem;
    font-weight: 600;
    color: var(--text-tertiary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
}

.bateria-music-flow__duration {
    font-size: 0.62rem;
    font-weight: 500;
    font-variant-numeric: tabular-nums;
    color: var(--text-tertiary);
    opacity: 0.85;
    white-space: nowrap;
}

.bateria-music-flow__segment.is-active .bateria-music-flow__label,
.bateria-music-flow__segment.is-active .bateria-music-flow__duration,
.bateria-music-flow__segment.is-selected .bateria-music-flow__label,
.bateria-music-flow__segment.is-selected .bateria-music-flow__duration {
    color: var(--text-primary);
}

.bateria-music-flow__fill {
    position: absolute;
    inset: 0 auto 0 0;
    width: 0;
    border-radius: 0;
    background: color-mix(in srgb, var(--flow-accent) 30%, transparent);
    transition: width 0.08s linear;
    pointer-events: none;
}

.bateria-toolbar {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    flex-wrap: wrap;
    padding-top: 0.85rem;
    border-top: var(--line-width) solid var(--border-color);
}

.bateria-icon-btn svg,
.bateria-bpm-card__icon svg,
.bateria-study-hub__track-icon svg {
    display: block;
}

.bateria-icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    border: var(--line-width) solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-primary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.bateria-icon-btn:hover:not(:disabled) {
    border-color: var(--text-tertiary);
    color: var(--text-primary);
}

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

.bateria-icon-btn:disabled {
    opacity: 0.45;
    cursor: wait;
}

.bateria-icon-btn--play {
    width: 3rem;
    height: 3rem;
    border-color: var(--link-color);
    background: var(--link-color);
    color: #06131c;
}

.bateria-icon-btn--play:not(:disabled):hover {
    border-color: var(--link-color-hover);
    background: var(--link-color-hover);
    color: #06131c;
}

.bateria-icon-btn--toggle.is-active,
.bateria-icon-btn--toggle[aria-pressed="true"] {
    border-color: var(--link-color);
    background: color-mix(in srgb, var(--link-color) 14%, var(--bg-primary));
    color: var(--link-color);
}

.bateria-icon-btn--toggle.is-off-tempo {
    border-color: var(--link-color);
    color: var(--link-color);
}

/* Contraste: o accent cyan (#00BFFF) fica fraco sobre fundos claros. No tema claro,
   escurece o accent das states ativas e reforça os ícones apagados (WCAG 1.4.11 >= 3:1). */
[data-theme="light"] .bateria-icon-btn--toggle.is-active,
[data-theme="light"] .bateria-icon-btn--toggle[aria-pressed="true"],
[data-theme="light"] .bateria-icon-btn--toggle.is-off-tempo {
    border-color: #0080ad;
    color: #0080ad;
}

[data-theme="light"] .bateria-bpm-card__icon,
[data-theme="light"] .bateria-study-hub__track-icon {
    color: #808080;
}

.bateria-toolbar__actions {
    display: flex;
    gap: 0.4rem;
    margin-left: auto;
}

.bateria-strudel-download {
    text-decoration: none;
}

.bateria-toolbar__toggles {
    display: flex;
    gap: 0.4rem;
}

.bateria-bpm-card {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    flex: 1;
    min-width: min(100%, 14rem);
    padding: 0.35rem 0.5rem 0.35rem 0.4rem;
    border: var(--line-width) solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-primary);
}

.bateria-bpm-card__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--text-tertiary);
}

.bateria-bpm-card__body {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.bateria-bpm-card__label {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-tertiary);
}

.bateria-bpm-card__row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

/* O triângulo de play tem massa visual à esquerda: leve nudge pra centrar opticamente. */
.bateria-play__icon-play { display: inline-flex; transform: translateX(1px); }
.bateria-play__icon-pause { display: inline-flex; }

/* Trilho fino + bolinha, sem preenchimento proporcional: um slider "de controle"
   (tipo knob) em vez de uma barra de progresso preenchida, que se confundia
   visualmente com a barra de seções da música logo abaixo. */
.bateria-bpm__slider {
    flex: 1;
    min-width: 4rem;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    background: transparent;
}

.bateria-bpm__slider::-webkit-slider-runnable-track {
    height: 3px;
    border-radius: 999px;
    background: var(--border-color);
}

.bateria-bpm__slider::-moz-range-track {
    height: 3px;
    border-radius: 999px;
    background: var(--border-color);
}

.bateria-bpm__slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 13px;
    height: 13px;
    margin-top: -5px;
    border-radius: 50%;
    background: var(--link-color);
    border: 2px solid var(--bg-primary);
    box-shadow: 0 0 0 1px var(--link-color);
}

.bateria-bpm__slider::-moz-range-thumb {
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--link-color);
    border: 2px solid var(--bg-primary);
    box-shadow: 0 0 0 1px var(--link-color);
}

.bateria-bpm__slider:focus-visible {
    outline: 2px solid var(--link-color);
    outline-offset: 3px;
}

.bateria-bpm__value {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
    min-width: 2rem;
    text-align: right;
}

.bateria-bpm__value::after {
    content: " bpm";
    font-size: 0.65rem;
    font-weight: 500;
    color: var(--text-tertiary);
}

.bateria-bpm__reset {
    align-self: center;
}

/* --- Studio Canvas --- */
.bateria-studio {
    position: relative;
    width: 100%;
    min-height: min(96vh, 1200px);
    border-radius: 8px;
    overflow: hidden;
    border: var(--line-width) solid var(--border-color);
    background: var(--bg-secondary);
}

.bateria-studio.is-sheet-focus {
    min-height: min(72vh, 780px);
    aspect-ratio: 5 / 3;
    max-height: min(90vh, 940px);
}

/* Tela cheia: o palco ocupa a tela toda (nativo :fullscreen ou fallback CSS). */
.bateria-studio:fullscreen,
.bateria-studio.is-fullscreen {
    width: 100vw;
    height: 100vh;
    min-height: 100vh;
    max-height: none;
    aspect-ratio: auto;
    border: none;
    border-radius: 0;
    z-index: 80;
}

.bateria-studio.is-fullscreen {
    position: fixed;
    inset: 0;
}

/* Botão de sair dentro do palco: o botão da toolbar fica coberto pelo overlay
   em tela cheia, e touch (iOS, que cai no fallback CSS) não tem tecla ESC.
   Só aparece em tela cheia; some no modo normal. */
.bateria-studio__exit-fullscreen {
    display: none;
    position: absolute;
    top: 1rem;
    right: 1rem;
    z-index: 90;
}

.bateria-studio:fullscreen .bateria-studio__exit-fullscreen,
.bateria-studio.is-fullscreen .bateria-studio__exit-fullscreen {
    display: inline-flex;
}

/* Barra inferior em tela cheia: hub + transporte ficam dentro do elemento
   fullscreen (fora dele o browser esconde tudo). */
.bateria-studio__dock {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 85;
    flex-direction: column;
    gap: 0.55rem;
    padding: 0.55rem 0.85rem max(0.65rem, env(safe-area-inset-bottom, 0px));
    max-height: min(46vh, 420px);
    overflow-y: auto;
    overscroll-behavior: contain;
    pointer-events: auto;
    background: linear-gradient(
        180deg,
        transparent 0%,
        color-mix(in srgb, var(--bg-primary) 72%, transparent) 18%,
        color-mix(in srgb, var(--bg-primary) 94%, transparent) 100%
    );
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    border-top: var(--line-width) solid color-mix(in srgb, var(--border-color) 70%, transparent);
}

.bateria-studio:fullscreen .bateria-studio__dock:not([hidden]),
.bateria-studio.is-fullscreen .bateria-studio__dock:not([hidden]) {
    display: flex;
}

.bateria-studio__dock .bateria-study-hub__panel {
    padding: 0.65rem 0.75rem;
    gap: 0.55rem;
}

.bateria-studio__dock .bateria-control-deck {
    padding: 0.65rem 0.75rem;
    gap: 0.65rem;
    border: none;
    background: color-mix(in srgb, var(--bg-secondary) 88%, transparent);
}

.bateria-studio__dock .bateria-control-deck__info {
    display: none;
}

.bateria-studio__dock .bateria-music-flow {
    padding-top: 0.55rem;
}

.bateria-studio__dock .bateria-toolbar__toggles #bateria-fullscreen {
    display: none;
}

.bateria-stage {
    position: absolute;
    inset: 0;
    aspect-ratio: unset;
    min-height: 100%;
    border: none;
    border-radius: 0;
    overflow: hidden;
    background: transparent;
}

.bateria-studio__scrim {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    background: linear-gradient(
        180deg,
        color-mix(in srgb, var(--bg-primary) 75%, transparent) 0%,
        color-mix(in srgb, var(--bg-primary) 35%, transparent) 30%,
        transparent 58%
    );
}

.bateria-notation-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 2;
    max-height: 24%;
    padding: 0 0.75rem 0.5rem;
    pointer-events: none;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    border: none;
    border-radius: 0;
    /* A partitura precisa de superfície própria: sobre o kit 3D as linhas finas
       da pauta somem. Fundo translúcido + blur mantém a leitura sem esconder o kit. */
    background: color-mix(in srgb, var(--bg-primary) 68%, transparent);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}

.bateria-notation-overlay.is-resizing,
.bateria-notation-overlay.is-dragging {
    user-select: none;
}

/* Barra da partitura: título + ação de destacar. Interativa (o overlay em si é
   pointer-events:none pra deixar girar o kit 3D por baixo). */
.bateria-notation-panel__bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    flex: 0 0 auto;
    height: 1.9rem;
    pointer-events: auto;
}

.bateria-notation-panel__title {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
}

.bateria-icon-btn--ghost {
    width: 1.7rem;
    height: 1.7rem;
    border-color: transparent;
    background: transparent;
    color: var(--text-tertiary);
}

.bateria-icon-btn--ghost:hover:not(:disabled) {
    border-color: var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
}

.bateria-notation-render {
    flex: 1 1 auto;
    min-height: 0;
    overflow: hidden;
}

.bateria-notation-overlay.has-custom-size .bateria-notation-render {
    min-height: var(--notation-max-h, 112px);
    overflow: hidden;
}

/* Alça de redimensionamento (borda inferior). */
.bateria-notation-panel__resize {
    flex: 0 0 auto;
    height: 0.55rem;
    margin: 0.15rem -0.75rem -0.5rem;
    cursor: ns-resize;
    pointer-events: auto;
    touch-action: none;
    display: flex;
    align-items: center;
    justify-content: center;
}

.bateria-notation-panel__resize::after {
    content: "";
    width: 2.25rem;
    height: 3px;
    border-radius: 3px;
    background: color-mix(in srgb, var(--text-tertiary) 55%, transparent);
    transition: background 0.15s ease;
}

.bateria-notation-panel__resize:hover::after {
    background: var(--link-color);
}

/* Modo destacado: painel flutuante fixo, fora do overflow do palco. */
.bateria-notation-overlay.is-detached {
    position: fixed;
    right: auto;
    z-index: 60;
    max-height: none;
    padding: 0.35rem 0.75rem 0.5rem;
    border: var(--line-width) solid var(--border-color);
    border-radius: 10px;
    background: color-mix(in srgb, var(--bg-primary) 94%, transparent);
    box-shadow: 0 10px 30px color-mix(in srgb, var(--text-primary) 22%, transparent);
}

.bateria-notation-overlay.is-detached .bateria-notation-panel__bar {
    cursor: grab;
}

.bateria-notation-overlay.is-detached.is-dragging .bateria-notation-panel__bar {
    cursor: grabbing;
}

.bateria-notation-overlay.is-detached .bateria-notation-panel__resize {
    cursor: nwse-resize;
    justify-content: flex-end;
    padding-right: 0.15rem;
}

.bateria-notation-overlay.is-detached .bateria-notation-panel__resize::after {
    width: 0.7rem;
    height: 0.7rem;
    border-radius: 0;
    background: transparent;
    border-right: 2px solid color-mix(in srgb, var(--text-tertiary) 60%, transparent);
    border-bottom: 2px solid color-mix(in srgb, var(--text-tertiary) 60%, transparent);
}

.bateria-notation-overlay.is-detached .bateria-notation-panel__resize:hover::after {
    border-color: var(--link-color);
    background: transparent;
}

.bateria-notation__viewport {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
    display: flex;
    align-items: center;
    /* Bordas suaves: o que já passou some à esquerda e o que vem surge (fade) à
       direita, em vez de cortar seco. Entrada bem maior que a saída pra não
       "comer" a clave no início. */
    --notation-fade-out: 14px;
    --notation-fade-in: 56px;
    -webkit-mask-image: linear-gradient(
        90deg,
        transparent 0,
        #000 var(--notation-fade-out),
        #000 calc(100% - var(--notation-fade-in)),
        transparent 100%
    );
    mask-image: linear-gradient(
        90deg,
        transparent 0,
        #000 var(--notation-fade-out),
        #000 calc(100% - var(--notation-fade-in)),
        transparent 100%
    );
}

/* Pauta deslizando: saída à esquerda bem mais larga pro que já tocou
   esvanecer, em vez do corte curto de repouso (que preserva a clave). */
.bateria-notation__viewport.is-scrolled {
    --notation-fade-out: 48px;
}

.bateria-notation__track {
    will-change: transform;
    flex: 0 0 auto;
}

.bateria-notation-overlay .bateria-notation__track svg,
.bateria-notation-overlay svg {
    display: block;
    width: auto;
    height: auto;
    min-width: 0;
    max-height: var(--notation-max-h, 110px);
}

.bateria-notation-overlay.has-custom-size .bateria-notation__track svg,
.bateria-notation-overlay.has-custom-size svg {
    max-height: var(--notation-max-h, 150px);
}

.bateria-notation__playhead {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 35%;
    width: 2px;
    margin-left: -1px;
    border-radius: 1px;
    background: var(--link-color);
    opacity: 0;
    pointer-events: none;
    z-index: 1;
    box-shadow: 0 0 4px color-mix(in srgb, var(--link-color) 40%, transparent);
    transition: opacity 0.15s ease;
}

.bateria-notation__playhead.is-active {
    opacity: 0.9;
}

.bateria-studio.is-sheet-focus .bateria-rhythm-highway {
    display: none;
}

.bateria-studio.is-sheet-focus .bateria-studio__scrim {
    background: linear-gradient(
        180deg,
        color-mix(in srgb, var(--bg-primary) 55%, transparent) 0%,
        color-mix(in srgb, var(--bg-primary) 20%, transparent) 38%,
        transparent 62%
    );
}

.bateria-studio.is-sheet-focus .bateria-notation-overlay {
    max-height: 48%;
    padding: 0.85rem 1.1rem 0.65rem;
    /* Modo partitura (padrão): faixa quase opaca com fio inferior, como uma
       estante de partitura sobre o kit. Máxima legibilidade da notação. */
    background: color-mix(in srgb, var(--bg-primary) 92%, transparent);
    border-bottom: var(--line-width) solid var(--border-color);
}

.bateria-studio.is-sheet-focus .bateria-notation-overlay .bateria-notation__track svg,
.bateria-studio.is-sheet-focus .bateria-notation-overlay svg {
    max-height: var(--notation-max-h, min(240px, 42vh));
}

.bateria-studio.is-sheet-focus .bateria-notation-overlay.has-custom-size .bateria-notation__track svg,
.bateria-studio.is-sheet-focus .bateria-notation-overlay.has-custom-size svg {
    max-height: var(--notation-max-h, 230px);
}

.bateria-rhythm-highway {
    position: absolute;
    inset: 0;
    z-index: 3;
    pointer-events: none;
}

.bateria-lane-labels {
    position: absolute;
    top: 22%;
    left: 0;
    right: 0;
    z-index: 2;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    text-align: center;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
    opacity: 0.85;
}

.bateria-lanes {
    position: absolute;
    inset: 0;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
}

.bateria-lane-labels[data-lane-count="4"],
.bateria-lanes[data-lane-count="4"] {
    grid-template-columns: repeat(4, 1fr);
}

.bateria-lane-labels[data-lane-count="5"],
.bateria-lanes[data-lane-count="5"] {
    grid-template-columns: repeat(5, 1fr);
}

.bateria-lane-labels[data-lane-count="6"],
.bateria-lanes[data-lane-count="6"] {
    grid-template-columns: repeat(6, 1fr);
}

.bateria-lane-labels[data-lane-count="7"],
.bateria-lanes[data-lane-count="7"] {
    grid-template-columns: repeat(7, 1fr);
}

/* Com cada tom em raia própria as colunas estreitam: rótulo menor. */
.bateria-lane-labels[data-lane-count="6"],
.bateria-lane-labels[data-lane-count="7"] {
    font-size: 0.58rem;
}

.bateria-lane {
    position: relative;
}

/* Divisória sutil: some sobre o kit (topo) e reaparece de leve perto da linha de batida */
.bateria-lane::after {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    width: 1px;
    background: linear-gradient(
        180deg,
        transparent 0%,
        transparent 45%,
        color-mix(in srgb, var(--border-color) 30%, transparent) 62%,
        transparent 100%
    );
}

.bateria-lane:last-child::after {
    display: none;
}

.bateria-lane.is-hidden {
    opacity: 0.2;
}

.bateria-lane.is-flash {
    background: color-mix(in srgb, var(--link-color) 12%, transparent);
}

.bateria-hit-line {
    position: absolute;
    left: 0;
    right: 0;
    top: 62%;
    height: 2px;
    background: var(--link-color);
    box-shadow: 0 0 4px color-mix(in srgb, var(--link-color) 50%, transparent);
    z-index: 4;
    pointer-events: none;
}

/* Teclas-alvo: mostram exatamente qual tecla apertar quando a gem cruza a linha. */
.bateria-hit-keys {
    position: absolute;
    left: 0;
    right: 0;
    top: 62%;
    transform: translateY(-50%);
    z-index: 6;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    justify-items: center;
    pointer-events: none;
}

.bateria-hit-keys[data-lane-count="4"] {
    grid-template-columns: repeat(4, 1fr);
}

.bateria-hit-keys[data-lane-count="5"] {
    grid-template-columns: repeat(5, 1fr);
}

.bateria-hit-keys[data-lane-count="6"] {
    grid-template-columns: repeat(6, 1fr);
}

.bateria-hit-keys[data-lane-count="7"] {
    grid-template-columns: repeat(7, 1fr);
}

.bateria-hit-key {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.72rem;
    line-height: 1.2;
    padding: 0.16rem 0.45rem;
    border: var(--line-width) solid var(--border-color);
    border-radius: 5px;
    background: color-mix(in srgb, var(--bg-primary) 88%, transparent);
    color: var(--text-secondary);
    box-shadow: 0 1px 3px color-mix(in srgb, var(--text-primary) 12%, transparent);
    transition: color 0.08s ease, border-color 0.08s ease, box-shadow 0.08s ease, transform 0.08s ease;
}

.bateria-hit-key.is-active {
    color: var(--link-color);
    border-color: var(--link-color);
    background: color-mix(in srgb, var(--link-color) 14%, var(--bg-primary));
    box-shadow: 0 0 10px color-mix(in srgb, var(--link-color) 45%, transparent);
    transform: scale(1.14);
}

.bateria-gem {
    position: absolute;
    width: 28px;
    height: 28px;
    border-radius: 4px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
}

.bateria-gem.is-hit {
    box-shadow: 0 0 16px currentColor;
    transform: translateX(-50%) scale(1.15);
}

/* Peças distinguidas pela raia (posição), não pela cor: gems monocromáticos. */
.bateria-lane--kick .bateria-gem { background: var(--text-primary); }
.bateria-lane--snare .bateria-gem {
    background: var(--bg-primary);
    border: 2px solid var(--text-primary);
}
.bateria-lane--hihat .bateria-gem { background: var(--text-tertiary); }
.bateria-lane--crash .bateria-gem {
    background: var(--bg-primary);
    border: 2px dashed var(--text-tertiary);
}
/* Os três toms compartilham a cor: a raia (e a tecla G/H/J) é o que os separa. */
.bateria-lane--ht .bateria-gem,
.bateria-lane--mt .bateria-gem,
.bateria-lane--lt .bateria-gem { background: #ff9f43; }

.bateria-legend {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.65rem 1.1rem;
    margin: 0;
    padding: 0;
    list-style: none;
    font-size: 0.78rem;
    color: var(--text-secondary);
}

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

.bateria-legend__swatch {
    width: 0.85rem;
    height: 0.85rem;
    border-radius: 3px;
    flex-shrink: 0;
}

.bateria-legend__swatch--kick { background: var(--text-primary); }
.bateria-legend__swatch--snare {
    background: var(--bg-primary);
    border: 2px solid var(--text-primary);
}
.bateria-legend__swatch--hihat { background: var(--text-tertiary); }
.bateria-legend__swatch--crash {
    background: var(--bg-primary);
    border: 2px dashed var(--text-tertiary);
}
.bateria-legend__swatch--tom { background: #ff9f43; }

.bateria-beat-markers {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(62% - 1.6rem);
    z-index: 5;
    display: flex;
    justify-content: space-around;
    padding: 0 12%;
    pointer-events: none;
}

.bateria-beat-marker {
    font-size: 0.85rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--text-tertiary);
    opacity: 0.5;
    transition: opacity 0.1s ease, color 0.1s ease, transform 0.1s ease;
}

.bateria-beat-marker.is-active {
    opacity: 1;
    color: var(--link-color);
    transform: scale(1.2);
}

.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: 6;
    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__fallback {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    font-size: 0.85rem;
    color: var(--text-tertiary);
    text-align: center;
    padding: 1rem;
}

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

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

.bateria-code__hint {
    margin: 0.75rem 0 0.5rem;
    color: var(--text-secondary);
    font-size: 0.82rem;
}

.bateria-code__file {
    display: inline-block;
    margin-bottom: 0.75rem;
    font-size: 0.82rem;
}

.bateria-code__heading {
    margin: 0.75rem 0 0.35rem;
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-tertiary);
}

.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: 640px) {
    .bateria-studio {
        min-height: 66vh;
    }

    .bateria-studio.is-sheet-focus {
        min-height: 66vh;
        aspect-ratio: 4 / 3;
        max-height: min(82vh, 760px);
    }

    .bateria-notation-overlay {
        max-height: 28%;
    }

    .bateria-toolbar {
        gap: 0.55rem;
    }

    .bateria-bpm-card {
        flex-basis: 100%;
        order: 2;
    }

    .bateria-toolbar__toggles {
        margin-left: 0;
        order: 1;
    }

    .bateria-studio.is-sheet-focus .bateria-notation-overlay {
        max-height: 52%;
    }
}

@media (prefers-reduced-motion: reduce) {
    .bateria-notation svg path,
    .bateria-notation svg text,
    .bateria-notation-overlay svg path,
    .bateria-notation-overlay svg text,
    .bateria-beat-marker,
    .bateria-gem,
    .bateria-notation__playhead,
    .bateria-music-flow__segment,
    .bateria-music-flow__fill {
        transition: none;
        animation: none;
    }
}

/* --------------------------------------------------------------------------
 * Percepção de carregamento: barra de progresso no topo + fade-in do app.
 * A barra só aparece com JS (.js vem do <head>); sem JS o app fica visível
 * direto. O controlador vive num script inline em bateria.html e é finalizado
 * pelo evento `bateria:ready` disparado por bateria.js quando a UI termina.
 * -------------------------------------------------------------------------- */
.bateria-loader {
    display: none;
}

.js .bateria-loader {
    display: block;
    position: fixed;
    inset: 0 0 auto 0;
    height: 2px;
    z-index: 1100;
    pointer-events: none;
    opacity: 1;
    transition: opacity 0.4s ease 0.15s;
}

.bateria-loader__bar {
    display: block;
    height: 100%;
    width: 0;
    background: var(--text-primary);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.45), 0 0 4px rgba(255, 255, 255, 0.3);
    transition: width 0.25s ease;
}

[data-theme="light"] .bateria-loader__bar {
    box-shadow: 0 0 8px rgba(0, 0, 0, 0.22);
}

.bateria-loader.is-done {
    opacity: 0;
}

/* App interativo entra suave quando a UI acaba de montar. Sem JS o seletor .js
 * não casa e o app fica no opacity padrão (1). */
.js .bateria-practice {
    opacity: 0;
    transition: opacity 0.55s ease;
}

.js .bateria-practice.is-ready {
    opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
    .js .bateria-loader {
        display: none;
    }
    .js .bateria-practice,
    .js .bateria-practice.is-ready {
        opacity: 1;
        transition: none;
    }
}