.letter-page{background:#f5f5f5;width:100%;height:100vh;overflow:hidden}.pdf-viewport{-webkit-overflow-scrolling:touch;touch-action:pan-y;width:100%;height:100%;position:relative;overflow:hidden auto}.pdf-scale{transform-origin:top;will-change:transform;width:100%;transition:transform 50ms ease-out}.pdf-error{color:#ff4d4f;text-align:center;flex-direction:column;justify-content:center;align-items:center;height:100%;padding:0 16px;display:flex}.pdf-error-detail{color:#999;word-break:break-all;margin-top:8px;font-size:12px}.pdf-footer{padding:12px 12px calc(12px + env(safe-area-inset-bottom));background:#f5f5f5}.pdf-download-btn{color:#fff;cursor:pointer;background:#1677ff;border:none;border-radius:4px;width:100%;height:44px;font-size:16px}.pdf-loading-overlay{color:#666;z-index:10;background:#f5f5f5;flex-direction:column;justify-content:center;align-items:center;gap:12px;display:flex;position:absolute;inset:0}.pdf-spinner{border:4px solid #e0e0e0;border-top-color:#1677ff;border-radius:50%;width:36px;height:36px;animation:.9s linear infinite pdf-spin}@keyframes pdf-spin{to{transform:rotate(360deg)}}