/* Unlayered to share the legacy arranger's cascade. Geometry stays in one
   canvas; this gutter gives keyboard and assistive-tech users real controls. */
.song-lane-layout { display: contents; }
.song-lane-toolbar, .song-lane-headers, .song-lane-vscroll, .song-track-details { display: none; }
body.zt-song-mode .song-lane-layout { display: flex; flex: 1 1 auto; min-height: 0; overflow: hidden; }
body.zt-song-mode .song-lane-layout .timeline-canvas-wrapper { flex: 1 1 0 !important; min-width: 0; }
/* Preserve the existing instrument edit action until its planned modal moves
   outside the legacy pattern container. It overlays; it reserves no lane space. */
body.zt-song-mode .container > #instrumentPanel.open { display: block !important; }
body.zt-song-mode #timelineTrackHeaders.song-lane-headers {
    display: block !important; position: relative; flex: 0 0 280px;
    padding: 0; margin: 0; border: 0; border-right: 1px solid var(--border-default);
    overflow: hidden; background: var(--surface-300, #18181b);
}
body.zt-song-mode .song-lane-toolbar {
    display: flex; align-items: center; gap: 16px; min-height: 34px; flex: 0 0 auto;
    padding: 5px 12px; border-bottom: 1px solid var(--border-default);
    color: var(--text-secondary); background: var(--surface-300); font-size: 11px;
}
.song-lane-summary { color: var(--text-primary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.song-lane-hint { margin-left: auto; white-space: nowrap; }
.song-lane-add, .song-lane-notes, .song-lane-rewrite { flex: 0 0 auto; border: 1px solid var(--border-default); border-radius: 5px; padding: 4px 8px; background: var(--surface-500); color: var(--text-primary); font: inherit; cursor: pointer; }
.song-lane-add { background: var(--accent-primary); border-color: var(--accent-primary); color: #fff; font-weight: 650; }
.song-lane-add:disabled { opacity: .45; cursor: default; }
.song-lane-rewrite { color: #e9d5ff; border-color: color-mix(in srgb, var(--accent-primary) 55%, transparent); }
.song-lane-caption { height: 34px; padding: 9px 12px; font: 10px ui-monospace, monospace; letter-spacing: 1px; color: var(--text-secondary); background: var(--surface-300); position: relative; z-index: 2; }
.song-lane-handle { position: relative; z-index: 2; background: var(--surface-300); height: 36px; padding: 8px 12px; color: var(--text-secondary); font-size: 11px; border-bottom: 1px solid var(--border-default); }
.song-lane-header { position: absolute; left: 0; right: 0; display: flex; flex-direction: column; justify-content: center; gap: 3px; padding: 5px 10px; border-left: 3px solid transparent; }
.song-lane-header[hidden] { display: none; }
.song-lane-header.is-focused { background: color-mix(in srgb, var(--lane-color) 11%, transparent); border-left-color: var(--lane-color); }
.song-lane-heading { display: flex; align-items: center; gap: 6px; min-width: 0; }
.song-lane-name { display: flex; align-items: center; flex: 1 1 auto; min-width: 0; background: transparent; border: 0; text-align: left; padding: 0; color: var(--text-primary); cursor: pointer; font-family: inherit; }
.song-lane-name strong { font-size: 12px; font-weight: 650; }
.song-lane-name strong::before { content: ''; display: inline-block; width: 6px; height: 6px; margin-right: 7px; border-radius: 2px; background: var(--lane-color); }
.song-lane-menu-button { width: 26px; height: 22px; padding: 0; border: 0; border-radius: 4px; background: transparent; color: var(--text-secondary); cursor: pointer; font-size: 16px; line-height: 1; }
.song-lane-menu-button:hover { background: var(--surface-500); color: var(--text-primary); }
.song-lane-instrument { width: 100%; min-height: 22px; border: 1px solid color-mix(in srgb, var(--border-default) 82%, transparent); border-radius: 5px; background: color-mix(in srgb, var(--surface-500) 72%, transparent); color: var(--text-primary); padding: 2px 7px; text-align: left; font: 10px inherit; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; cursor: pointer; }
.song-lane-instrument:hover { border-color: color-mix(in srgb, var(--lane-color) 55%, var(--border-default)); color: var(--text-primary); }
.song-lane-controls { display: flex; align-items: center; flex-direction: row; gap: 4px; }
.song-lane-control-row { display: flex; align-items: center; gap: 7px; }
.song-lane-control-group { display: flex; align-items: center; gap: 2px; min-width: 0; }
.song-lane-control-group + .song-lane-control-group { padding-left: 7px; border-left: 1px solid color-mix(in srgb, var(--border-default) 75%, transparent); }
.song-lane-controls button { min-width: 42px; min-height: 22px; padding: 1px 7px; border: 1px solid var(--border-default); border-radius: 5px; background: var(--surface-400); color: var(--text-secondary); cursor: pointer; font: 10px inherit; }
.song-lane-level { min-width: 0; margin-left: 3px; flex: 1 1 auto; display: grid; grid-template-columns: auto minmax(34px, 1fr) 31px; align-items: center; gap: 4px; color: var(--text-secondary); font-size: 9px; }
.song-lane-level input { width: 100%; min-width: 34px; height: 16px; accent-color: var(--lane-color); }
.song-lane-level output { color: var(--text-primary); font: 9px ui-monospace, monospace; text-align: right; }
.song-lane-actions { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 4px; }
.song-lane-actions button { min-width: 0; min-height: 23px; padding: 2px 5px; border: 1px solid var(--border-default); border-radius: 5px; background: var(--surface-400); color: var(--text-primary); cursor: pointer; font: 10px inherit; }
.song-lane-actions .song-lane-action--ai { border-color: color-mix(in srgb, var(--accent-primary) 50%, var(--border-default)); color: color-mix(in srgb, var(--accent-primary) 70%, white); }
.song-lane-controls button:disabled { cursor: default; opacity: .28; }
.song-lane-controls button.is-at-limit { opacity: .6; border-color: color-mix(in srgb, var(--accent-warning, #f59e0b) 65%, var(--border-default)); }
.song-lane-controls button.is-at-limit::after { content: ''; width: 3px; height: 3px; margin-left: 2px; display: inline-block; border-radius: 50%; background: var(--accent-warning, #f59e0b); vertical-align: middle; }
.song-lane-pitch-state { display: inline-flex; align-items: center; justify-content: center; min-width: 37px; height: 22px; padding: 0 4px; border-radius: 4px; background: color-mix(in srgb, var(--surface-500) 72%, transparent); color: var(--text-primary); font: 9px/1 ui-monospace, monospace; white-space: nowrap; }
.song-lane-note-range { min-width: 55px; color: color-mix(in srgb, var(--lane-color) 70%, white); }
.song-lane-controls button:not(:disabled):hover, .song-lane-actions button:hover, .song-lane-add:hover, .song-lane-notes:hover, .song-lane-rewrite:hover { border-color: var(--lane-color, var(--accent-primary)); color: var(--text-primary); }
.song-lane-controls button[aria-pressed="true"] { background: var(--accent-primary); border-color: var(--accent-primary); color: #fff; }
.song-lane-controls button[aria-pressed="mixed"] { border-color: var(--accent-warning); color: var(--accent-warning); }
.song-lane-layout button:focus-visible, .song-lane-notes:focus-visible { outline: 2px solid var(--accent-primary); outline-offset: 2px; }
body.zt-song-mode .song-lane-vscroll { display: block; position: absolute; right: 0; bottom: 10px; width: 10px; overflow-y: scroll; overflow-x: hidden; scrollbar-width: thin; z-index: 3; }
body.zt-song-mode .song-lane-vscroll[hidden] { display: none; }
.song-lane-vscroll > div { width: 1px; }
body.zt-song-mode .song-track-details:not([hidden]) { display: block; flex: 0 0 auto; border-top: 1px solid color-mix(in srgb, var(--accent-primary) 45%, var(--border-default)); background: linear-gradient(180deg, color-mix(in srgb, var(--surface-300) 94%, var(--accent-primary)), var(--surface-300)); box-shadow: 0 -8px 26px #00000024; }
.song-track-details > header { min-height: 42px; display: flex; align-items: center; gap: 18px; padding: 5px 12px; border-bottom: 1px solid var(--border-default); }
.song-track-details-identity { display: flex; flex-direction: column; min-width: 150px; }
.song-track-details-identity strong { font-size: 12px; color: var(--text-primary); }
.song-track-details-identity span { font-size: 10px; color: var(--text-secondary); white-space: nowrap; }
.song-track-details-tabs { display: flex; align-self: stretch; gap: 3px; }
.song-track-details-tabs button { border: 0; border-bottom: 2px solid transparent; background: transparent; padding: 0 12px; color: var(--text-secondary); font: 11px inherit; cursor: pointer; }
.song-track-details-tabs button[aria-selected="true"] { border-bottom-color: var(--accent-primary); color: var(--text-primary); background: color-mix(in srgb, var(--accent-primary) 8%, transparent); }
.song-track-details-close { margin-left: auto; border: 0; background: transparent; color: var(--text-secondary); font-size: 20px; cursor: pointer; }
.song-track-details-body { min-height: 62px; display: flex; align-items: center; gap: 8px; padding: 9px 12px; overflow-x: auto; }
.song-track-details-body label { display: flex; align-items: center; gap: 8px; color: var(--text-secondary); font-size: 10px; }
.song-track-details-body .song-track-scope { align-self: stretch; padding-right: 10px; margin-right: 2px; border-right: 1px solid var(--border-default); }
.song-track-scope > span { color: var(--text-muted, var(--text-secondary)); font-size: 9px; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; white-space: nowrap; }
.song-track-details-body .song-track-scope select { min-width: 178px; }
.song-track-details-body .song-track-scope .song-track-target-browse { min-width:max-content; }
.song-track-target-status { max-width:250px; margin:0; color:var(--text-secondary); font-size:10px; line-height:1.35; }
.song-track-target-status[data-type="error"] { color:var(--accent-danger, #ef4444); }
.song-track-harmony-context { display: inline-flex; align-items: center; min-height: 30px; padding: 4px 9px; border: 1px solid color-mix(in srgb, var(--accent-primary) 26%, var(--border-default)); border-radius: 5px; background: color-mix(in srgb, var(--accent-primary) 7%, var(--surface-500)); color: var(--text-secondary); font-size: 10px; white-space: nowrap; }
.song-track-details-body select { min-width: 190px; }
.song-track-details-body select, .song-track-details-body button { min-height: 30px; border: 1px solid var(--border-default); border-radius: 5px; background: var(--surface-500); color: var(--text-primary); padding: 4px 9px; font: 11px inherit; }
.song-track-details-body button { cursor: pointer; }
.song-track-details-body button.is-primary { background: var(--accent-primary); border-color: var(--accent-primary); color: #fff; }
.song-track-details-body input[type="range"] { width: 180px; accent-color: var(--accent-primary); }
.song-track-details-body output, .song-track-pitch-summary { min-width: 72px; color: var(--text-primary); font: 10px ui-monospace, monospace; }
.song-track-writing-range { display:flex; align-items:center; gap:5px; min-height:30px; padding:3px 5px 3px 9px; border:1px solid var(--border-default); border-radius:5px; background:var(--surface-500); color:var(--text-secondary); font-size:10px; white-space:nowrap; }
.song-track-writing-range input { width:38px; min-height:24px; box-sizing:border-box; padding:2px 4px; color:var(--text-primary); background:var(--surface-400); border:1px solid var(--border-default); border-radius:4px; }
.song-track-writing-range button { min-height:24px; }
.song-track-ai-summary { max-width: 330px; color: var(--text-secondary); font-size: 11px; line-height: 1.35; }
.song-track-ai-cost { margin-left: auto; color: var(--text-muted, #71717a); font-size: 10px; white-space: nowrap; }
.song-track-menu { position: fixed; z-index: 10020; min-width: 168px; display: flex; flex-direction: column; padding: 5px; border: 1px solid var(--border-default); border-radius: 7px; box-shadow: 0 12px 32px #0009; background: var(--surface-400); }
.song-track-menu button { min-height: 30px; border: 0; border-radius: 4px; background: transparent; color: var(--text-primary); text-align: left; padding: 5px 9px; font: 11px inherit; cursor: pointer; }
.song-track-menu button:hover { background: var(--surface-600); }
.song-track-menu button:disabled { opacity: .35; cursor: default; }
.song-track-menu button.is-danger { color: var(--accent-danger, #fb7185); border-top: 1px solid var(--border-default); margin-top: 4px; }
.song-track-add-dialog { width: min(440px, calc(100vw - 32px)); padding: 0; border: 1px solid var(--border-default); border-radius: 10px; box-shadow: 0 24px 70px #000c; background: var(--surface-300); color: var(--text-primary); }
.song-track-add-dialog::backdrop { background: #050507b8; backdrop-filter: blur(2px); }
.song-track-add-dialog form { display: flex; flex-direction: column; gap: 14px; padding: 18px; }
.song-track-add-dialog header, .song-track-add-dialog footer { display: flex; align-items: center; gap: 10px; }
.song-track-add-dialog header div { display: flex; flex-direction: column; }
.song-track-add-dialog header strong { font-size: 16px; }
.song-track-add-dialog header span { color: var(--text-secondary); font-size: 11px; }
.song-track-add-dialog header > button { margin-left: auto; border: 0; background: transparent; color: var(--text-secondary); font-size: 20px; }
.song-track-add-dialog label { display: grid; gap: 6px; color: var(--text-secondary); font-size: 11px; }
.song-track-add-dialog input, .song-track-add-dialog select { width: 100%; min-height: 36px; border: 1px solid var(--border-default); border-radius: 6px; padding: 6px 9px; background: var(--surface-500); color: var(--text-primary); }
.song-track-add-dialog footer { justify-content: flex-end; margin-top: 4px; }
.song-track-add-dialog footer button { min-height: 34px; border: 1px solid var(--border-default); border-radius: 6px; padding: 5px 13px; background: var(--surface-500); color: var(--text-primary); cursor: pointer; }
.song-track-add-dialog footer button.is-primary { background: var(--accent-primary); border-color: var(--accent-primary); color: #fff; }
@media (max-width: 1100px) { .song-lane-hint { display: none; } .song-lane-notes { margin-left: auto; } }
@media (min-width: 701px) and (max-width: 1400px) {
    .song-track-details-body { flex-wrap: wrap; align-items: center; overflow-x: hidden; }
    .song-track-details-body .song-track-scope { flex: 1 1 100%; align-self: auto; padding: 0 0 8px; margin: 0; border-right: 0; border-bottom: 1px solid var(--border-default); }
    .song-track-details-body .song-track-scope select { flex: 1 1 300px; min-width: 0; }
    .song-track-target-status { flex: 1 1 100%; max-width: none; margin: -1px 0 1px; }
}
@media (max-width: 900px) {
    body.zt-song-mode #timelineTrackHeaders.song-lane-headers { flex-basis: 230px; }
    .song-lane-level span { display: none; }
    .song-track-ai-cost { display: none; }
}
@media (max-width: 700px) {
    body.zt-song-mode #timelineTrackHeaders.song-lane-headers { flex-basis: 200px; }
    .song-lane-header { padding-left: 7px; padding-right: 7px; }
    .song-lane-name strong { font-size: 11px; }
    .song-lane-controls button { min-width: 36px; padding-inline: 4px; }
    .song-lane-level output { display: none; }
    .song-lane-level { grid-template-columns: minmax(32px, 1fr); }
    .song-lane-actions button { min-height: 30px; font-size: 9px; }
    .song-track-details > header { flex-wrap: wrap; gap: 0 8px; padding: 5px 8px 0; }
    .song-track-details-identity { flex: 1 1 auto; min-width: 0; }
    .song-track-details-identity span { overflow: hidden; text-overflow: ellipsis; }
    .song-track-details-tabs { order: 3; width: 100%; height: 34px; }
    .song-track-details-tabs button { flex: 1 1 0; min-width: 0; padding-inline: 3px; }
    .song-track-details-close { flex: 0 0 28px; }
    .song-track-details-body { min-height: 84px; flex-wrap: wrap; align-items: stretch; overflow-x: hidden; padding: 8px; }
    .song-track-details-body label { flex: 1 1 100%; min-width: 0; }
    .song-track-details-body .song-track-scope { padding: 0 0 8px; margin: 0; border-right: 0; border-bottom: 1px solid var(--border-default); }
    .song-track-harmony-context { flex: 1 1 100%; white-space: normal; }
    .song-track-details-body select { flex: 1 1 auto; width: 100%; min-width: 0; }
    .song-track-details-body button { flex: 1 1 calc(50% - 4px); white-space: normal; }
    .song-track-details-body input[type="range"] { flex: 1 1 auto; width: auto; min-width: 80px; }
    .song-track-ai-summary { flex: 1 1 100%; max-width: none; }
}