:root{color-scheme:light dark;--bg: #fbfbfa;--panel: #ffffff;--border: #e3e1dd;--text: #1f1d1a;--muted: #6b665e;--accent: #2f6f4f;--accent-soft: #e8f1eb;--warn: #8a5a20;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif}@media(prefers-color-scheme:dark){:root{--bg: #171614;--panel: #201e1c;--border: #35322e;--text: #efece7;--muted: #a09a90;--accent: #7fc0a0;--accent-soft: #23302a;--warn: #d9a45f}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-size:14px;line-height:1.5}header.app{display:flex;align-items:baseline;gap:16px;flex-wrap:wrap;padding:14px 20px;border-bottom:1px solid var(--border);background:var(--panel);position:sticky;top:0;z-index:10}header.app h1{font-size:16px;margin:0;font-weight:650}header.app .sub{color:var(--muted);font-size:12px}header.app .spacer{flex:1}main{padding:20px;display:grid;gap:20px;max-width:1500px}section.panel{background:var(--panel);border:1px solid 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var(--accent);border-radius:1px;z-index:4}.rh.tl{top:-4px;left:-4px;cursor:nwse-resize}.rh.tr{top:-4px;right:-4px;cursor:nesw-resize}.rh.bl{bottom:-4px;left:-4px;cursor:nesw-resize}.rh.br{bottom:-4px;right:-4px;cursor:nwse-resize}.draw-preview{position:absolute;border:2px dashed var(--accent);background:#4a9eff14;pointer-events:none;z-index:10}.layout-sidebar{border:1px solid var(--border);border-radius:8px;background:var(--panel);display:flex;flex-direction:column;overflow:hidden;max-height:720px}.layout-sidebar-header{padding:8px 10px;border-bottom:1px solid var(--border);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}.layout-element-list{flex:1;overflow-y:auto}.layout-elem-item{padding:5px 8px;border-bottom:1px solid var(--border);cursor:pointer;display:flex;align-items:center;gap:6px;font-size:12px}.layout-elem-item:hover{background:var(--accent-soft)}.layout-elem-item.selected{background:var(--accent-soft);outline:1px solid 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