.feed-card{background:#fff;border-radius:8px;overflow:hidden;box-shadow:0 2px 8px #00000014;transition:all .3s ease;cursor:pointer;display:flex;flex-direction:column}.feed-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px #0000001f}.feed-card-cover{width:100%;aspect-ratio:4 / 5;position:relative;overflow:hidden;background:linear-gradient(135deg,#667eea,#764ba2)}.cover-image{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}.feed-card:hover .cover-image{transform:scale(1.05)}.cover-placeholder{width:100%;height:100%;display:flex;align-items:center;justify-content:center;color:#fff9;font-size:14px}.cover-overlay{position:absolute;top:8px;right:8px}.cover-category{padding:4px 8px;background:#00000080;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);border-radius:4px;color:#fff;font-size:12px;font-weight:500}.feed-card-content{padding:12px;display:flex;flex-direction:column;gap:8px;flex:1}.feed-card-title{font-size:14px;font-weight:500;color:#333;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;text-overflow:ellipsis;margin:0}.feed-card-desc{font-size:12px;color:#999;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;text-overflow:ellipsis;margin:0;flex:1}.feed-card-footer{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:8px;border-top:1px solid #f0f0f0}.feed-card-meta{display:flex;align-items:center;gap:8px}.level-badge{padding:2px 8px;border-radius:4px;font-size:11px;font-weight:500;text-transform:uppercase}.level-badge.level-beginner{background:#e6f7e6;color:#10b981}.level-badge.level-intermediate{background:#fff4e6;color:#f59e0b}.level-badge.level-advanced{background:#ffe6e6;color:#ef4444}.pro-badge{font-size:11px;color:#ff2442;font-weight:500;padding:2px 6px;background:#fff5f5;border-radius:4px}@media (max-width: 768px){.feed-card-content{padding:10px}.feed-card-title{font-size:13px}.feed-card-desc{font-size:11px}}.feed-wrapper{width:100%;min-height:100vh;background:#fafafa;display:flex;flex-direction:column}.feed-header{position:sticky;top:0;z-index:1000;background:#fff;border-bottom:1px solid #e8e8e8;box-shadow:0 2px 8px #0000000a}.feed-header-content{max-width:1440px;margin:0 auto;padding:0 24px;height:64px;display:flex;align-items:center;justify-content:space-between;gap:24px}.feed-logo{font-size:20px;font-weight:600;color:#ff2442;white-space:nowrap}.feed-header-search{flex:1;max-width:400px;position:relative;display:flex;align-items:center}.feed-search-input{width:100%;padding:8px 80px 8px 16px;border:1px solid #e8e8e8;border-radius:20px;background:#f7f7f7;font-size:14px;transition:all .2s}.feed-search-input:focus{outline:none;border-color:#ff2442;background:#fff}.search-hint{position:absolute;right:16px;font-size:12px;color:#999;pointer-events:none}.feed-header-actions{display:flex;gap:16px;align-items:center}.header-btn{padding:8px 16px;background:transparent;border:none;color:#333;font-size:14px;cursor:pointer;border-radius:4px;transition:background .2s}.header-btn:hover{background:#f7f7f7}.feed-main{max-width:1440px;margin:0 auto;padding:0 24px;display:flex;gap:24px;width:100%}.feed-sidebar{width:200px;flex-shrink:0;padding-top:24px}.feed-nav{display:flex;flex-direction:column;gap:8px}.nav-item{padding:12px 16px;border-radius:8px;font-size:16px;color:#333;cursor:pointer;transition:background .2s}.nav-item:hover{background:#f7f7f7}.nav-item.active{background:#fff5f5;color:#ff2442;font-weight:500}.feed-content{flex:1;padding-top:24px;padding-bottom:48px;overflow-y:auto;max-height:calc(100vh - 64px)}.feed-categories{display:flex;gap:8px;margin-bottom:24px;padding-bottom:16px;border-bottom:1px solid #e8e8e8;overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none}.feed-categories::-webkit-scrollbar{display:none}.category-tab{padding:8px 20px;border:none;background:transparent;color:#666;font-size:14px;border-radius:20px;cursor:pointer;white-space:nowrap;transition:all .2s}.category-tab:hover{background:#f7f7f7}.category-tab.active{background:#ff2442;color:#fff;font-weight:500}.feed-grid{display:grid;gap:16px;grid-auto-rows:min-content}.feed-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100vh;gap:16px}.feed-loading-more{display:flex;align-items:center;justify-content:center;gap:12px;padding:32px;color:#999;font-size:14px}.feed-end{text-align:center;padding:32px;color:#999;font-size:14px}.feed-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:80px 24px;gap:16px;color:#999}.clear-filter{padding:8px 16px;background:#ff2442;color:#fff;border:none;border-radius:20px;cursor:pointer;font-size:14px;transition:background .2s}.clear-filter:hover{background:#e01e3c}.loading-spinner{width:24px;height:24px;border:3px solid rgba(255,36,66,.1);border-top-color:#ff2442;border-radius:50%;animation:spin .8s linear infinite}@media (max-width: 1024px){.feed-sidebar{display:none}.feed-header-content,.feed-main{padding:0 16px}.feed-header-actions{display:none}}@media (max-width: 768px){.feed-search-input{font-size:16px}.search-hint{display:none}.feed-categories{margin-bottom:16px;padding-bottom:12px}.category-tab{padding:6px 16px;font-size:13px}.feed-grid{gap:12px}}.app{width:100%;min-height:100vh}.app-loading,.app-error{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100vh;gap:1rem}.loading-spinner{width:40px;height:40px;border:4px solid rgba(255,36,66,.1);border-top-color:#ff2442;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.app-error button{padding:.5rem 1rem;background:#007bff;color:#fff;border:none;border-radius:4px;cursor:pointer}.app-error button:hover{background:#0056b3}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:#fafafa;color:#333;margin:0;padding:0}#root{width:100%;min-height:100vh}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}