:root{color-scheme:light;--bg:#f6f5f1;--panel:#fff;--ink:#1c1917;--muted:#57534e;--line:#d6d3d1;--accent:#1d4ed8;--danger:#b91c1c;--error-bg:#fef2f2;--error-line:#fecaca;--preview-dot:#57534e38}:root[data-theme=dark]{color-scheme:dark;--bg:#1c1917;--panel:#292524;--ink:#fafaf9;--muted:#a8a29e;--line:#44403c;--accent:#93c5fd;--danger:#fca5a5;--error-bg:#450a0a;--error-line:#7f1d1d;--preview-dot:#a8a29e2e}*{box-sizing:border-box}html,body{height:100%}body{background:var(--bg);color:var(--ink);margin:0;font-family:Segoe UI,system-ui,sans-serif}.shell{flex-direction:column;min-height:100%;display:flex}.header,.footer{background:var(--panel);border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:1rem;padding:.75rem 1rem;display:flex}.footer{border-bottom:0;border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}.header 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