:root{--bg-main:#f4f4f5;--bg-surface:#fff;--bg-hover:#f3f4f6;--text-main:#18181b;--text-muted:#71717a;--border-color:#e4e4e7;--accent:#2563eb;--accent-hover:#1d4ed8;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -2px #0000001a}@media (prefers-color-scheme:dark){:root{--bg-main:#09090b;--bg-surface:#18181b;--bg-hover:#27272a;--text-main:#f4f4f5;--text-muted:#a1a1aa;--border-color:#27272a;--accent:#3b82f6;--accent-hover:#60a5fa}}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-main);color:var(--text-main);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5}button{cursor:pointer;color:inherit;background:0 0;border:none;font-family:inherit}input,textarea{color:inherit;font-family:inherit}.app-container{max-width:1200px;min-height:100vh;margin:0 auto;display:flex}.sidebar{border-right:1px solid var(--border-color);flex-direction:column;gap:8px;width:240px;height:100vh;padding:24px;display:flex;position:sticky;top:0}.main-content{flex:1;max-width:768px;padding:32px 48px}.nav-item{border-radius:var(--radius-sm);color:var(--text-muted);align-items:center;gap:12px;padding:10px 16px;font-weight:500;transition:all .2s;display:flex}.nav-item:hover,.nav-item.active{background-color:var(--bg-hover);color:var(--text-main)}.card{background-color:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);margin-bottom:16px;padding:16px}