:root{--sidebar-width:280px;--toolbar-height:60px;--primary-color:#2563eb;--primary-hover:#1d4ed8;--border-color:#e5e7eb;--bg-light:#f9fafb;--bg-white:#ffffff;--text-dark:#1f2937;--text-gray:#6b7280;--shadow-sm:0 1px 2px 0 rgba(0,0,0,0.05);--shadow-md:0 4px 6px -1px rgba(0,0,0,0.1)}*{box-sizing:border-box;margin:0;padding:0}body,html{height:100%;overflow:hidden}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;color:var(--text-dark);background-color:var(--bg-light)}.app-container{display:flex;flex-direction:column;height:100vh;width:100vw}.main-content{display:flex;flex:1 1;overflow:hidden}button{font-family:inherit;cursor:pointer;border:none;background:none;padding:0}button:disabled{cursor:not-allowed;opacity:.5}input[type=file]{font-family:inherit}