:root{--bg: #0b0f13;--panel: #131a20;--line: #232c34;--card: #182029;--fg: #e8eef2;--muted: #8b98a5;--accent: #3fc1c9;--danger: #e0655f;color-scheme:dark}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:var(--bg);color:var(--fg);font:15px/1.4 Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif}#app{display:flex;flex-direction:column;min-height:100vh}.bar{display:flex;align-items:center;gap:14px;padding:12px 18px;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(8px);flex-wrap:wrap}.bar .back{color:var(--muted);text-decoration:none;font-weight:600;white-space:nowrap}.bar .back:hover{color:var(--accent)}.bar .song b{font-weight:700}.bar .spacer{flex:1}.muted{color:var(--muted)}.ctl{background:var(--card);color:var(--fg);border:1px solid var(--line);border-radius:8px;padding:7px 9px;font:inherit}.chk{display:inline-flex;align-items:center;gap:6px;color:var(--muted);font-size:13.5px;white-space:nowrap}.btn{background:var(--card);color:var(--fg);border:1px solid var(--line);border-radius:9px;padding:8px 13px;font:600 14px inherit;cursor:pointer}.btn:hover{border-color:var(--accent)}.btn.primary{background:var(--accent);color:#04252a;border-color:var(--accent)}.actions{display:inline-flex;align-items:center;gap:10px}.cols{display:grid;gap:16px;padding:16px;align-items:start;flex:1;grid-template-columns:300px 300px 1fr;grid-template-areas:"sections order preview"}.panel-sections{grid-area:sections}.panel-order{grid-area:order}.panel-slides{grid-area:preview}.panel{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px;min-width:0}.panel.grow{min-height:60vh}.panel h2{margin:0 0 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1000px){.cols{grid-template-columns:1fr 1fr;grid-template-areas:"sections order" "preview preview"}.bar{gap:10px}}@media (max-width: 700px){.bar{gap:8px 10px;padding:10px 12px;position:sticky;background:var(--bg);backdrop-filter:none}.bar .song{font-size:14px;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.bar .spacer{display:none}.ctl{padding:8px;font-size:13px}.tabs{display:flex;gap:6px;position:sticky;top:0;z-index:6;padding:8px 12px;background:var(--bg);border-bottom:1px solid var(--line)}.tab{flex:1;background:var(--card);color:var(--muted);border:1px solid var(--line);border-radius:9px;padding:9px 0;font:600 13px inherit;cursor:pointer}.tab.on{background:var(--accent);color:#04252a;border-color:var(--accent)}.cols{display:block;padding:12px 12px 84px}.cols .panel{display:none}.cols.m-sections .panel-sections,.cols.m-order .panel-order,.cols.m-slides .panel-slides{display:block}.panel.grow{min-height:auto}.slides{grid-template-columns:1fr}.actions{position:fixed;left:0;right:0;bottom:0;z-index:20;display:flex;gap:10px;padding:10px 12px calc(10px + env(safe-area-inset-bottom));background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(8px);border-top:1px solid var(--line)}.actions .btn{flex:1;padding:12px 8px}.actions .act-present{display:none}}