.header-top-controls .header-rhythm {
    margin-left: 0;
    justify-content: flex-start;
}

.header-rhythm {
    display: flex;
    align-items: center;
    margin-left: auto;
    justify-content: flex-end;
}

.rhythm-primary-display {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0 6px;
    border-radius: 0;
    background: none;
    color: var(--theme-text);
    font-weight: 600;
    min-height: 0;
    transition: background 0.2s ease;
    white-space: nowrap;
    max-width: 100%;
}

.rhythm-primary-label {
    text-transform: uppercase;
    letter-spacing: 0.6px;
    font-size: 12px;
    color: var(--theme-text);
    transition: color 0.2s ease;
}

.rhythm-primary-sequence {
    font-size: 18px;
    letter-spacing: 1px;
    display: inline-block;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
}

.rhythm-primary-display.has-rhythm {
    background: none;
}

.rhythm-panel {
    display: none;
    flex: 1 1 auto;
    min-height: 0;
    padding: 16px;
    border-radius: 12px;
    border: 1px solid transparent;
    background: var(--rgba-255-255-255-0_85);
    gap: 20px;
}

.lyrics_container.layout-rhythm textarea,
.lyrics_container.layout-rhythm .guide-panel,
.lyrics_container.layout-rhythm .lyrics-output,
.lyrics_container.layout-rhythm .tab-panel {
    display: none;
}

.lyrics_container.layout-rhythm .rhythm-panel {
    display: flex;
    flex-wrap: wrap;
}

.rhythm-saved,
.rhythm-generator {
    flex: 1 1 320px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.rhythm-saved {
    border-right: 1px solid var(--rgba-0-0-0-0_1);
    padding-right: 16px;
}

.rhythm-generator {
    padding-left: 16px;
}

.rhythm-editor {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 12px;
    padding: 12px;
    border-radius: 12px;
    background: var(--rgba-255-255-255-0_9);
}

.rhythm-editor[hidden] {
    display: none;
}

.rhythm-editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.rhythm-editor-header h4 {
    margin: 0;
    font-size: 16px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.rhythm-editor-close {
    background: var(--rgba-0-0-0-0_1);
}

.rhythm-editor-config {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.rhythm-editor-config label {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 13px;
    font-weight: 600;
    color: var(--theme-text);
}

.rhythm-editor-config select {
    padding: 6px 10px;
    border-radius: 6px;
    border: 1px solid var(--rgba-0-0-0-0_2);
    background: var(--rgba-255-255-255-0_9);
}

.rhythm-editor-grid {
    display: grid;
    gap: 8px;
    grid-auto-rows: 48px;
    border: 1px dashed var(--rgba-0-0-0-0_2);
    padding: 10px;
    border-radius: 10px;
    background: var(--rgba-0-0-0-0_04);
}

.rhythm-editor-cell {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background: var(--rgba-255-255-255-0_8);
    font-size: 20px;
    font-weight: 600;
    color: var(--theme-text);
    cursor: pointer;
    border: 2px solid transparent;
    transition: background 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.rhythm-editor-cell:hover {
    background: var(--rgba-255-255-255-1);
    transform: translateY(-1px);
}

.rhythm-editor-cell.is-active {
    border-color: var(--theme-text);
}

.rhythm-editor-cell.is-empty {
    color: var(--rgba-0-0-0-0_25);
}

.rhythm-editor-symbols {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.rhythm-symbol-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    border-radius: 8px;
    border: none;
    background: var(--rgba-0-0-0-0_1);
    font-size: 18px;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease;
}

.rhythm-symbol-btn span {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.rhythm-symbol-btn:hover,
.rhythm-symbol-btn:focus-visible {
    background: var(--rgba-0-0-0-0_2);
    transform: translateY(-1px);
    outline: none;
}

.rhythm-symbol-btn.is-selected {
    background: var(--theme-surface-1);
    color: var(--theme-text);
}

.rhythm-editor-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.rhythm-editor-actions .icon-btn {
    min-width: 110px;
}

.rhythm-legend {
    margin-top: 12px;
    padding: 12px;
    border-radius: 10px;
    background: var(--rgba-0-0-0-0_05);
}

.rhythm-legend h4 {
    margin: 0 0 8px;
    font-size: 16px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--theme-text);
}

.rhythm-legend ul {
    margin: 0;
    padding-left: 16px;
    display: grid;
    gap: 6px;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.rhythm-legend li {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--theme-text);
}

.rhythm-panel h3 {
    margin: 0;
    font-size: 20px;
    color: var(--theme-text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.rhythm-saved-header,
.rhythm-generator-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

.rhythm-controls {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.rhythm-controls input {
    width: 72px;
    padding: 6px 8px;
    border-radius: 6px;
    border: 1px solid var(--rgba-0-0-0-0_2);
    background: var(--rgba-255-255-255-0_9);
    font-size: 14px;
}

.rhythm-list {
    list-style: none;
    margin: 0;
    padding: 0;
    border-radius: 10px;
    background: var(--rgba-0-0-0-0_05);
    flex: 1 1 auto;
    overflow-y: auto;
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.rhythm-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 12px;
    border-radius: 10px;
    background: var(--rgba-255-255-255-0_9);
    position: relative;
}

.rhythm-card::before {
    content: "";
    position: absolute;
    top: 8px;
    left: 10px;
    font-size: 16px;
    opacity: 0.75;
}

.rhythm-card[data-rhythm-source="manual"]::before {
    content: "★";
    color: var(--theme-text);
}

.rhythm-card[data-rhythm-source="generated"]::before {
    content: "⚙";
    color: var(--theme-text);
}

.rhythm-sequence {
    font-size: 18px;
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    color: var(--theme-text);
    margin-left: 20px;
}

.rhythm-actions {
    display: inline-flex;
    gap: 6px;
    align-items: center;
}

.rhythm-actions button {
    border: none;
    background: var(--rgba-0-0-0-0_08);
    padding: 6px;
    border-radius: 50%;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease;
    font-size: 16px;
    line-height: 1;
}

.rhythm-actions button:hover {
    background: var(--rgba-0-0-0-0_2);
    transform: translateY(-1px);
}

.rhythm-actions button.is-playing {
    background: var(--rgba-255-112-67-0_25);
    color: var(--theme-text);
}

.rhythm-actions button:disabled {
    opacity: 0.45;
    cursor: default;
    transform: none;
}

.rhythm-actions button:focus-visible {
    outline: none;
}

.rhythm-primary-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    letter-spacing: 0.4px;
    text-transform: uppercase;
    font-weight: 600;
    color: var(--rgba-0-0-0-0_6);
    cursor: pointer;
    user-select: none;
}

.rhythm-primary-toggle input[type="checkbox"] {
    accent-color: var(--theme-text);
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.rhythm-primary-toggle span {
    display: inline-block;
}

.rhythm-empty {
    margin: 0;
    padding: 16px;
    border-radius: 10px;
    background: var(--rgba-0-0-0-0_05);
    color: var(--rgba-0-0-0-0_6);
    font-style: italic;
}

.rhythm-random-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 12px;
    flex: 1 1 auto;
    overflow-y: auto;
}

.rhythm-generator-card {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 12px;
    border-radius: 12px;
    background: var(--rgba-255-255-255-0_92);
}

.rhythm-generator-card .rhythm-sequence {
    justify-content: center;
}

.rhythm-generator-card .rhythm-actions {
    justify-content: center;
}

.rhythm-generator-card .rhythm-actions button {
    border-radius: 8px;
    padding: 6px 10px;
    background: var(--rgba-0-0-0-0_08);
}

@media (max-width: 520px) {
    body {
        background: var(--theme-gradient);
    }

    .app-brand {
        padding: 6px 12px;
        flex-direction: column;
        align-items: center;
        gap: 2px;
    }

    .app-brand-name {
        font-size: 26px;
    }

    .app-brand-version {
        font-size: 16px;
    }

    .header {
        padding: 12px 16px;
    }

    .song-close-btn {
        font-size: 16px;
    }

    .song-list {
        max-height: 260px;
    }

    .topbar .icon-btn,
    .export-btn {
        font-size: 16px;
    }

    .toggle-sidebar-text {
        display: none;
    }

    .rhythm-legend ul {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .header-right-blocks {
        gap: 12px;
    }

    .instrument-toggle {
        flex-direction: column;
    }

    .instrument-btn {
        width: 100%;
    }
}