:root{--color-primary-500:#3b82f6;--color-primary-600:#2563eb;--color-primary-700:#1d4ed8;--color-neutral-0:#fff;--color-neutral-50:#f8fafc;--color-neutral-100:#f1f5f9;--color-neutral-200:#e2e8f0;--color-neutral-300:#cbd5e1;--color-neutral-400:#94a3b8;--color-neutral-500:#64748b;--color-neutral-600:#475569;--color-neutral-700:#334155;--color-neutral-800:#1e293b;--color-neutral-900:#0f172a;--bg-default:var(--color-neutral-0);--bg-subtle:var(--color-neutral-50);--border-default:var(--color-neutral-200);--text-primary:var(--color-neutral-900);--text-secondary:var(--color-neutral-600);--text-muted:var(--color-neutral-400);--interactive-primary:var(--color-primary-600);--interactive-primary-hover:var(--color-primary-700);--font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;--space-4:16px;--space-6:24px;--space-8:32px;--radius-md:6px;--radius-lg:8px;--shadow-sm:0 1px 3px 0 rgba(0,0,0,.1),0 1px 2px -1px rgba(0,0,0,.1)}*,:after,:before{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-subtle);color:var(--text-primary);line-height:1.5;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.app-shell{min-height:100vh;display:flex;flex-direction:column}.app-header{position:-webkit-sticky;position:sticky;top:0;z-index:200;background:var(--bg-default);border-bottom:1px solid var(--border-default)}.app-nav{max-width:1280px;margin:0 auto;padding:0 var(--space-6);height:56px;gap:var(--space-8)}.app-logo,.app-nav{display:flex;align-items:center}.app-logo{gap:8px;font-weight:600;font-size:.9rem}.logo-mark{color:var(--interactive-primary);font-size:1.2rem}.nav-links{display:flex;gap:var(--space-6)}.nav-links a{font-size:.875rem;color:var(--text-secondary);transition:color .15s}.nav-links a:hover{color:var(--text-primary)}.app-main{flex:1 1;max-width:1280px;margin:0 auto;width:100%;padding:var(--space-8) var(--space-6)}