:root{--primary-blue:#007aff;--success-green:#34c759;--danger-red:#ff3b30;--warning-orange:#ff9500;--gray-light:#f5f7fa;--gray-border:#e5e5ea;--shadow-sm:0 2px 8px #0000000f;--shadow-lg:0 8px 24px #00000014;--radius:12px;--radius-lg:16px;--transition:.3s ease}*{box-sizing:border-box;margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.loading{height:100vh;color:var(--primary-blue);justify-content:center;align-items:center;font-size:18px;display:flex}.progressBar{background:var(--gray-border);border-radius:3px;height:6px;margin:16px 0 8px;overflow:hidden}.progressFill{background:var(--primary-blue);height:100%;transition:width .3s}.tip{color:#888;text-align:center;background:#fff;border-radius:8px;margin-top:8px;padding:8px;font-size:13px}