*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,system-ui,-apple-system,BlinkMacSystemFont,sans-serif;background:#f8f9fa;line-height:1.6;color:#333}#app{min-height:100vh}.loading-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#f8f9fa;display:flex;justify-content:center;align-items:center;z-index:9999}.loading-content{text-align:center}.spinner{width:40px;height:40px;border:4px solid #e3e3e3;border-top:4px solid #007bff;border-radius:50%;animation:spin 1s linear infinite;margin:0 auto 20px}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.loading-content p{color:#666;font-size:16px;margin:0}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:#f1f1f1}::-webkit-scrollbar-thumb{background:linear-gradient(135deg,#3498db,#2980b9);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:linear-gradient(135deg,#2980b9,#3498db)}::selection{background:#3498db;color:#fff}*:focus{outline:2px solid #3498db;outline-offset:2px}button:focus,input:focus,textarea:focus{outline:none}