body{margin:0;background:#f5f7fa;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,PingFang SC,Microsoft YaHei,sans-serif}#app{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:16px}#app,.card{box-sizing:border-box}.card{width:100%;max-width:520px}.center{text-align:center}.center h2{font-size:24px;margin:0 0 20px 0}.mt{margin-top:16px}.loading-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;background:#f5f7fa}.loading-spinner{width:48px;height:48px;border:4px solid #e4e7ed;border-top-color:#409eff;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.loading-text{margin-top:20px;color:#606266;font-size:16px}.button-container{width:100%;display:flex;flex-direction:column;gap:12px}.download-btn{width:100%!important;margin:0!important;display:block}.platform-info{color:#909399;font-size:14px;margin-top:8px}@media (max-width:768px){.card{max-width:100%}}@media (max-width:480px){.card h2{font-size:20px}.download-btn{font-size:14px}.platform-info{font-size:12px}}