:root{--color-bg:#f0f2f5;--color-surface:#fff;--color-text:#1e293b;--color-text-muted:#64748b;--color-text-subtle:#94a3b8;--color-border:#e2e8f0;--color-primary:#2563eb;--color-primary-hover:#1d4ed8;--color-primary-soft:#eff6ff;--color-nav:#0f172a;--color-nav-text:#cbd5e1;--color-nav-muted:#94a3b8;--color-error:#b91c1c;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--shadow-sm:0 1px 3px #0f172a0f;--shadow-md:0 4px 16px #0f172a14;--shadow-lg:0 8px 32px #0f172a1a;--font:Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;color:var(--color-text);background:var(--color-bg);font-family:var(--font);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-weight:400;line-height:1.5}*{box-sizing:border-box}body{min-height:100vh;margin:0}a{color:var(--color-primary);text-decoration:none}a:hover{text-decoration:underline}button{border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);color:inherit;cursor:pointer;font:inherit;padding:.4rem .75rem}button:hover{background:#f8fafc}.app-loading{color:var(--color-text-muted);margin:2rem}.app-loading--error,.page-status--error{color:var(--color-error)}.page-status{color:var(--color-text-muted)}.app-shell{flex-direction:column;min-height:100vh;display:flex}.app-shell__header{background:var(--color-nav);color:var(--color-nav-text);box-shadow:var(--shadow-sm);z-index:100;position:sticky;top:0}.app-shell__main{flex:1;padding:2rem 2.5rem;overflow-y:auto}.app-shell__main--home{padding:0}.menu-shell{align-items:center;gap:2rem;max-width:100%;min-height:3.25rem;padding:0 1.5rem;display:flex}.menu-shell__brand{letter-spacing:.04em;color:#fff;text-transform:uppercase;flex-shrink:0;font-size:1rem;font-weight:700;text-decoration:none}.menu-shell__brand:hover{color:#fff;opacity:.85;text-decoration:none}.menu-shell__items{align-items:center;min-width:0;display:flex}.menu-branch{align-items:center;gap:.25rem;margin:0;padding:0;list-style:none;display:flex}.menu-branch__item{position:relative}.menu-branch__item:hover>.menu-dropdown{display:block}.menu-link,.menu-folder{border-radius:var(--radius-sm);white-space:nowrap;padding:.5rem .75rem;display:block}.menu-link{color:var(--color-nav-text)}.menu-link:hover{background:#94a3b826;text-decoration:none}.menu-link--active{background:var(--color-primary);color:#fff}.menu-folder{color:var(--color-nav-muted);cursor:default;font-size:.85rem;font-weight:600}.menu-dropdown{background:var(--color-nav);border-radius:var(--radius-md);min-width:160px;box-shadow:var(--shadow-md);border:1px solid #94a3b833;margin:0;padding:.35rem;list-style:none;display:none;position:absolute;top:100%;left:0}.menu-dropdown .menu-branch{flex-direction:column;align-items:stretch;gap:0}.menu-dropdown .menu-branch__item+.menu-branch__item{margin-top:.15rem}.menu-dropdown .menu-dropdown{top:0;left:100%}.home-page{flex-direction:column;justify-content:center;align-items:center;min-height:calc(100vh - 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