:root{--font-primary: "Inter", -apple-system, "Segoe UI", sans-serif;--space-xs: 4px;--space-sm: 8px;--space-md: 12px;--space-lg: 20px;--space-xl: 32px;--space-2xl: 48px;--sidebar-width: 260px;--topbar-height: 72px;--card-radius: 12px;--btn-radius: 8px;--shadow-card: 0px 4px 12px rgba(0, 0, 0, .3);--shadow-hover: 0px 6px 18px rgba(0, 0, 0, .45);--shadow-focus: 0 0 0 2px rgba(255, 204, 51, .45)}:root,:root[data-theme=light]{--color-bg: #f4f4f4;--color-surface: #ffffff;--color-surface-alt: #fafafa;--color-border: #e0e0e0;--color-primary: #c20f38;--color-secondary: #ffc800;--color-text: #101010;--color-text-muted: #5c5c5c;--color-text-tertiary: #8a8a8a;--color-badge: #ffc800;color-scheme:light}:root[data-theme=dark]{--color-bg: #0f0f0f;--color-surface: #111111;--color-surface-alt: #161616;--color-border: #242424;--color-primary: #c20f38;--color-secondary: #ffc800;--color-text: #ffffff;--color-text-muted: #b3b3b3;--color-text-tertiary: #7a7a7a;--color-badge: #ffc800;color-scheme:dark}*,*:before,*:after{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--color-bg);color:var(--color-text);font-family:var(--font-primary);line-height:1.5}a{color:inherit;text-decoration:none}button{font-family:inherit}.app-shell{display:flex;min-height:calc(100vh - var(--topbar-height));background:var(--color-bg)}.sidebar{width:var(--sidebar-width);background:var(--color-surface);border-right:1px solid var(--color-border);padding:var(--space-xl) var(--space-lg);display:flex;flex-direction:column;gap:var(--space-xl);position:sticky;top:var(--topbar-height);height:calc(100vh - var(--topbar-height))}.brand{display:flex;align-items:center;gap:var(--space-sm);font-weight:700;font-size:18px;color:var(--color-primary);letter-spacing:.4px}.nav-group-label{font-size:12px;text-transform:uppercase;color:var(--color-text-tertiary);margin:var(--space-sm) 0 var(--space-xs);letter-spacing:.6px}.sidebar 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