@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes slideOut{to{opacity:0;transform:translateX(100%)}}@keyframes bounce{0%,to{transform:scale(1)}50%{transform:scale(1.2)}}@keyframes shake{0%,to{transform:translateX(0)}10%,30%,50%,70%,90%{transform:translateX(-5px)}20%,40%,60%,80%{transform:translateX(5px)}}@keyframes pulse{0%,to{transform:scale(1);opacity:1}50%{transform:scale(1.05);opacity:.8}}@keyframes ripple{0%{transform:scale(0);opacity:.5}to{transform:scale(4);opacity:0}}@keyframes slideUpMobile{0%{transform:translateY(100%);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes scaleIn{0%{transform:scale(.95);opacity:0}to{transform:scale(1);opacity:1}}@keyframes checkmark{0%{transform:scale(0);opacity:0}50%{transform:scale(1.2)}to{transform:scale(1);opacity:1}}@keyframes badgeChange{0%,to{transform:scale(1)}50%{transform:scale(1.3)}}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(360deg)}}@keyframes slideDown{0%{transform:translateX(-50%) translateY(-100%);opacity:0}to{transform:translateX(-50%) translateY(0);opacity:1}}:root{--font-reading:Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Source Sans Pro', system-ui, sans-serif;--font-ui:-apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;--font-mono:'Monaco', 'Menlo', 'Ubuntu Mono', monospace}*{padding:0;box-sizing:border-box}body{font-family:var(--font-ui);background-color:#f5f5f5;color:#333;height:100vh}body.app-body{overflow:hidden}#app-loading-screen{position:fixed;top:0;left:0;width:100%;height:100%;background-color:#fff;display:flex;align-items:center;justify-content:center;z-index:9999;transition:opacity .3s ease-out}#app-loading-screen.fade-out{opacity:0;pointer-events:none}.loading-content{display:flex;flex-direction:column;align-items:center;gap:20px}.loading-spinner{width:50px;height:50px;border:4px solid #f3f3f3;border-top:4px solid #1a73e8;border-radius:50%;animation:spin 1s linear infinite}.loading-text{font-size:16px;color:#5f6368;font-family:var(--font-ui)}.header{background-color:#fff;border-bottom:1px solid #e1e5e9;padding:0 20px;height:60px;z-index:1000;position:relative;transition:box-shadow .3s ease}.header.scrolled{box-shadow:0 2px 8px rgba(0,0,0,.1)}.header-content{display:flex;justify-content:space-between;align-items:center;height:100%}.logo{font-size:24px;font-weight:700;color:#1a73e8}.header-actions{display:flex;gap:10px}.article-filter label,.btn{font-size:14px;cursor:pointer}.btn{padding:8px 16px;border:0;border-radius:4px;font-weight:500;transition:background-color .2s ease,transform .1s ease,box-shadow .2s ease}.btn:active{transform:scale(.95)}.btn-primary{background-color:#1a73e8;color:#fff}.btn-primary:hover{background-color:#1765cc}.btn-secondary{background-color:#f8f9fa;color:#3c4043;border:1px solid #dadce0}.btn-secondary:hover{background-color:#f1f3f4}.main-container{display:flex;height:calc(100vh - 60px);overflow:hidden}.sidebar-wrapper{display:contents}.feed-pane{width:300px;border-right:1px solid #e1e5e9}.article-pane,.content-pane,.feed-pane{background-color:#fff;overflow-y:auto}.article-pane{width:400px;border-right:1px solid #e1e5e9}.content-pane{flex:1}.pull-to-refresh-indicator{position:absolute;top:0;left:0;right:0;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:16px;background:linear-gradient(to bottom,rgba(26,115,232,.05),transparent);transform:translateY(-100px);opacity:0;transition:opacity .2s ease;pointer-events:none;z-index:1000}.pull-to-refresh-spinner{width:24px;height:24px;border:3px solid #e1e5e9;border-top-color:#1a73e8;border-radius:50%;margin-bottom:8px;opacity:0;transition:opacity .2s ease}.pull-to-refresh-indicator.ready .pull-to-refresh-spinner{opacity:1}.pull-to-refresh-indicator.refreshing 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infinite;margin-right:10px}.article-item{will-change:transform}.feed-item{will-change:background-color}.article-content img{loading:lazy}.button-spinner-overlay{position:absolute!important;top:0!important;left:0!important;right:0!important;bottom:0!important;width:100%!important;height:100%!important;display:flex!important;align-items:center!important;justify-content:center!important;background-color:rgba(255,0,0,.8)!important;pointer-events:none!important;border-radius:4px!important;z-index:999!important}.button-spinner-overlay .spinner{width:20px!important;height:20px!important;border:3px solid #ccc!important;border-top:3px solid #fff!important;border-radius:50%!important;animation:spin 1s linear infinite!important;display:block!important}.form-group input:disabled{background-color:#f5f5f5;color:#999;cursor:not-allowed}.btn:disabled:not(.loading){background-color:#f5f5f5;color:#999;cursor:not-allowed;border:1px solid #ddd}#connection-indicator.offline,.error{background-color:#fce8e6;color:#d93025}.error,.success{padding:20px;border-radius:4px;margin:20px;font-size:14px}.success{background-color:#e6f4ea;color:#137333}.error-message{position:fixed;top:20px;left:50%;transform:translateX(-50%);max-width:500px;background:#fff;border-radius:8px;box-shadow:0 4px 12px rgba(0,0,0,.15);padding:16px 20px;z-index:10000;animation:slideDown .3s ease-out}.error-content{display:flex;align-items:flex-start;gap:12px;margin-bottom:12px}.error-icon{font-size:24px;flex-shrink:0}.error-text{flex:1;font-size:14px;line-height:1.5;color:#333}.error-buttons{display:flex;gap:8px;justify-content:flex-end}.error-dismiss-btn,.error-retry-btn{padding:8px 16px;border-radius:4px;border:0;font-size:13px;font-weight:500;cursor:pointer;transition:all 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ease-out;pointer-events:auto}.toast.show{opacity:1;transform:translateX(0)}.toast-icon{font-size:20px;flex-shrink:0}.toast-message{flex:1;font-size:14px;line-height:1.4;color:#333}.toast-success{border-left:4px solid #137333}.toast-success .toast-icon{color:#137333}.toast-error{border-left:4px solid #d93025}.toast-error .toast-icon{color:#d93025}.toast-warning{border-left:4px solid #f9ab00}.toast-warning .toast-icon{color:#f9ab00}.toast-info{border-left:4px solid #1a73e8}.toast-info .toast-icon{color:#1a73e8}#connection-indicator{position:fixed;top:10px;right:10px;padding:6px 12px;border-radius:4px;font-size:12px;font-weight:500;z-index:9998;transition:all .3s;display:none}#connection-indicator.offline{display:block;border:1px solid #d93025}#connection-indicator.online{display:none}#connection-indicator.online.show-briefly{display:block;background-color:#e6f4ea;color:#137333;border:1px solid #137333}@media (max-width:768px){.error-message{max-width:calc(100vw - 40px);top:10px}#toast-container{bottom:10px;right:10px;left:10px}.toast{min-width:auto;max-width:100%}#connection-indicator{top:5px;right:5px}}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:#f1f1f1}::-webkit-scrollbar-thumb{background:#c1c1c1;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#a1a1a1}#login-screen{position:fixed;top:0;left:0;width:100%;height:100%;background-color:#f5f5f5;display:flex;align-items:center;justify-content:center;z-index:3000}.login-container{background-color:#fff;padding:60px 40px;border-radius:8px;box-shadow:0 2px 10px rgba(0,0,0,.1);text-align:center;max-width:400px;width:90%}.login-container h1,.privacy-container h1{color:#1a73e8;margin-bottom:20px;font-size:32px;font-weight:300}.login-container p,.privacy-container p{color:#5f6368;margin-bottom:30px;font-size:16px;line-height:1.5}#google-login-btn,#logout-btn{background-color:#1a73e8;color:#fff;border:0;padding:12px 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.status-badge{background-color:#fbbc04;color:#202124}.subscription-status.expired .status-badge{background-color:#ea4335;color:#fff}.status-text,.subscription-status.loading{color:#5f6368;font-size:11px}.login-footer{margin-top:30px;padding-top:20px;border-top:1px solid #e1e5e9}.privacy-link{color:#1a73e8;text-decoration:none;font-size:14px;transition:color .2s}.privacy-link:hover{color:#1557b0;text-decoration:underline}.privacy-container{max-width:800px;margin:0 auto;padding:40px 20px;background-color:#fff;min-height:100vh}.privacy-content{margin-bottom:40px}.privacy-container h1{margin-bottom:30px;text-align:center}.privacy-container h2{margin:30px 0 15px;font-size:20px}.privacy-container p{margin-bottom:15px;line-height:1.6}.privacy-container ul{color:#5f6368;margin:15px 0 15px 30px;line-height:1.6}.privacy-container li{margin-bottom:8px}.privacy-actions{text-align:center;padding-top:20px;border-top:1px solid #e1e5e9}.help-content{margin-top:20px}.shortcut-section{margin-bottom:30px}.shortcut-section h3{color:#3c4043;font-size:16px;font-weight:600;margin-bottom:15px;border-bottom:1px solid #e1e5e9;padding-bottom:8px}.shortcut-item{display:flex;align-items:center;justify-content:space-between;padding:8px 0;border-bottom:1px solid #f1f3f4}.shortcut-item:last-child{border-bottom:none}.shortcut-item kbd{background-color:#f8f9fa;border:1px solid #dadce0;border-radius:4px;padding:4px 8px;font-family:var(--font-mono);font-size:12px;color:#3c4043;font-weight:600;min-width:30px;text-align:center}.shortcut-item span{color:#5f6368;font-size:14px;flex:1;margin-left:15px}.help-item{margin:12px 0;line-height:1.5;font-size:14px;color:#5f6368}.help-item strong{color:#1a73e8;font-weight:600}@media screen and (max-width:1023px){#app,body{height:-webkit-fill-available}#app{padding-top:env(safe-area-inset-top);padding-top:constant(safe-area-inset-top);height:100vh;display:flex;flex-direction:column}.header{padding-left:max(20px,env(safe-area-inset-left));padding-right:max(20px,env(safe-area-inset-right));flex-shrink:0}.main-container{flex:1;min-height:0}.tablet-help-message{display:none}}@media screen and (max-width:1023px) and (min-width:768px){.tablet-help-message{display:block!important}.header{padding:0 15px;padding-left:max(15px,env(safe-area-inset-left));padding-right:max(15px,env(safe-area-inset-right));height:56px}.logo{font-size:22px}.mobile-menu-btn{display:block;background:0 0;border:0;font-size:28px;cursor:pointer;padding:8px;color:#5f6368;min-width:44px;min-height:44px}.header-actions{display:none;position:absolute;top:56px;left:0;right:0;background:#fff;border-bottom:1px solid #e1e5e9;padding:12px 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