:root{--primary-color: #000000;--bg-color: #ffffff;--surface-color: #ffffff;--text-primary: #1a1a1a;--text-secondary: #666666;--border-color: #eaeaea;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .04);--shadow-md: 0 8px 24px rgba(0, 0, 0, .06);--shadow-lg: 0 12px 32px rgba(0, 0, 0, .08);--radius-md: 12px;--radius-lg: 16px;--radius-xl: 20px;--font-family: "Inter", system-ui, -apple-system, sans-serif;--transition: all .3s cubic-bezier(.25, .8, .25, 1)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-family);background-color:var(--bg-color);color:var(--text-primary);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#app{max-width:600px;margin:0 auto;min-height:100vh;position:relative;background:var(--bg-color);box-shadow:0 0 40px #00000008}.app-header{position:sticky;top:0;z-index:100;padding:12px 20px;background:#ffffffd9;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-color)}.header-container{display:flex;justify-content:space-between;align-items:center;max-width:100%}.logo{height:32px;object-fit:contain}.header-actions{display:flex;gap:8px}.header-btn{background:transparent;border:none;color:var(--text-primary);width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:var(--transition)}.header-btn:hover{background:var(--border-color)}.header-btn.hidden{display:none}.header-btn.active{color:#007aff}.video-section{padding:24px 20px 16px}.section-title{font-weight:700;font-size:1.25rem;margin-bottom:16px;display:flex;align-items:center;gap:8px;letter-spacing:-.02em}.section-title:before{content:"";display:block;width:8px;height:8px;border-radius:50%;background-color:#ff3b30;animation:pulse 2s infinite}@keyframes pulse{0%{transform:scale(.95);box-shadow:0 0 #ff3b30b3}70%{transform:scale(1);box-shadow:0 0 0 6px #ff3b3000}to{transform:scale(.95);box-shadow:0 0 #ff3b3000}}.video-container{width:100%;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-md);aspect-ratio:9 / 16;max-width:400px;margin:0 auto;background:var(--border-color);position:relative}.video-container iframe{width:100%;height:100%;border:none;position:absolute;top:0;left:0}.categories-section{padding:12px 20px;position:sticky;top:57px;z-index:99;background:#fffffff2;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-color)}.categories-scroll{display:flex;gap:12px;overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none;padding-bottom:4px}.categories-scroll::-webkit-scrollbar{display:none}.category-btn{padding:8px 16px;border-radius:20px;background:#f5f5f5;border:1px solid transparent;color:var(--text-secondary);font-size:.875rem;font-weight:500;white-space:nowrap;cursor:pointer;transition:var(--transition);font-family:var(--font-family)}.category-btn:hover{background:#eaeaea}.category-btn.active{background:var(--primary-color);color:#fff;box-shadow:0 4px 12px #00000026}.feed-section{padding:16px 20px 40px}.feed-grid{display:flex;flex-direction:column;gap:24px}.article-card{background:var(--surface-color);border-radius:var(--radius-xl);overflow:hidden;box-shadow:var(--shadow-sm);border:1px solid var(--border-color);transition:var(--transition);cursor:pointer;text-decoration:none;color:inherit;display:flex;flex-direction:column}.article-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}.article-image-wrapper{width:100%;aspect-ratio:16 / 9;overflow:hidden;background:var(--border-color);position:relative}.article-img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}.article-card:hover .article-img{transform:scale(1.05)}.article-content{padding:16px 20px 20px;display:flex;flex-direction:column;gap:8px}.article-meta{display:flex;justify-content:space-between;align-items:center;font-size:.75rem;color:var(--text-secondary);font-weight:600;text-transform:uppercase;letter-spacing:.5px}.article-category{color:var(--primary-color)}.article-title{font-size:1.125rem;font-weight:700;color:var(--text-primary);line-height:1.35;display:-webkit-box;-webkit-line-clamp:3;line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;letter-spacing:-.01em}.article-desc{font-size:.875rem;color:var(--text-secondary);display:-webkit-box;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-top:4px}.skeleton{background:linear-gradient(90deg,#f5f5f5 25%,#e8e8e8,#f5f5f5 75%);background-size:200% 100%;animation:skeleton-loading 1.5s infinite}@keyframes skeleton-loading{0%{background-position:200% 0}to{background-position:-200% 0}}.skeleton-video{width:100%;height:100%}.skeleton-card{padding:0;border:1px solid var(--border-color)}.skeleton-img{width:100%;aspect-ratio:16 / 9;background:#f5f5f5}.skeleton-text{height:12px;margin:16px 20px 0;background:#f5f5f5;border-radius:4px;width:80%}.skeleton-text.title{height:20px;width:90%;margin-bottom:8px}.toast-container{position:fixed;bottom:24px;left:50%;transform:translate(-50%);display:flex;flex-direction:column;gap:8px;z-index:1000;pointer-events:none;width:max-content;max-width:90vw}.toast{background:#1a1a1af2;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);color:var(--bg-color);padding:12px 20px;border-radius:var(--radius-md);font-size:.875rem;font-weight:500;box-shadow:0 4px 12px #00000026;animation:slideUp .3s cubic-bezier(.175,.885,.32,1.275) forwards;pointer-events:auto}@keyframes slideUp{0%{opacity:0;transform:translateY(20px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}.install-promo{position:fixed;bottom:0;left:0;right:0;background:#fff;padding:16px;box-shadow:0 -4px 24px #00000014;display:flex;align-items:center;justify-content:space-between;gap:16px;z-index:100;transform:translateY(100%);transition:transform .4s cubic-bezier(.175,.885,.32,1.275);border-top-left-radius:var(--radius-xl);border-top-right-radius:var(--radius-xl)}.install-promo.show{transform:translateY(0)}.promo-content{display:flex;align-items:center;gap:12px;flex:1}.promo-logo{width:48px;height:48px;border-radius:12px;box-shadow:var(--shadow-sm);background:#fff;padding:4px;object-fit:contain}.promo-text h3{font-size:.9375rem;margin:0 0 2px;font-weight:600}.promo-text p{font-size:.75rem;color:var(--text-secondary);margin:0}.promo-actions{display:flex;gap:8px;align-items:center}.promo-close{background:transparent;border:none;color:var(--text-secondary);padding:8px;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center}.promo-install-btn{background:var(--primary-color);color:#fff;border:none;padding:8px 16px;border-radius:20px;font-size:.875rem;font-weight:600;cursor:pointer;transition:transform .2s}.promo-install-btn:active{transform:scale(.95)}@media(min-width:601px){.install-promo{bottom:24px;left:50%;transform:translate(-50%) translateY(150%);width:420px;border-radius:var(--radius-lg)}.install-promo.show{transform:translate(-50%) translateY(0)}}.app-footer{text-align:center;padding:24px 20px 80px;font-size:.8125rem;color:var(--text-secondary);border-top:1px solid var(--border-color);background:var(--bg-color)}.app-footer p{margin:0}.app-footer a{color:var(--primary-color);font-weight:600;text-decoration:none;transition:opacity .2s}.app-footer a:hover{opacity:.8;text-decoration:underline}.sidebar-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000;opacity:0;pointer-events:none;transition:var(--transition)}.sidebar-overlay.active{opacity:1;pointer-events:auto}.sidebar{position:fixed;top:0;bottom:0;left:0;width:280px;background:var(--surface-color);z-index:1001;transform:translate(-100%);transition:transform .3s cubic-bezier(.175,.885,.32,1);box-shadow:var(--shadow-xl);display:flex;flex-direction:column}.sidebar.active{transform:translate(0)}.sidebar-header{padding:16px 20px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border-color)}.sidebar-logo{height:28px;object-fit:contain}.sidebar-nav{display:flex;flex-direction:column;padding:16px 0;overflow-y:auto}.sidebar-nav a{padding:14px 24px;color:var(--text-primary);text-decoration:none;font-weight:600;font-size:.9375rem;display:flex;align-items:center;gap:12px;transition:background .2s}.sidebar-nav a:hover,.sidebar-nav a:active{background:#f5f5f5;color:var(--primary-color)}