:root{--bg-primary: #0a0a0f;--bg-secondary: #12121a;--bg-panel: rgba(18, 18, 26, .95);--text-primary: #e8e8f0;--text-secondary: #a0a0c0;--accent-cyan: #00d4ff;--accent-purple: #a855f7;--accent-pink: #ec4899;--accent-gold: #f59e0b;--accent-green: #10b981;--glow-cyan: rgba(0, 212, 255, .4);--glow-purple: rgba(168, 85, 247, .4);--radius: 12px;--radius-sm: 8px;--transition: .3s cubic-bezier(.4, 0, .2, 1)}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html,body{width:100%;height:100%;overflow:hidden;font-family:Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg-primary);color:var(--text-primary)}.hidden{display:none!important}.app{width:100%;height:100%;position:relative}.top-nav{position:fixed;top:0;left:0;right:0;height:64px;display:flex;align-items:center;justify-content:space-between;padding:0 24px;background:#0a0a0fd9;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,.06);z-index:1000}.nav-left{display:flex;align-items:center;gap:32px}.nav-logo{display:flex;align-items:center;text-decoration:none}.logo-text{font-size:1.4rem;font-weight:800;letter-spacing:-.02em}.nav-tabs{display:flex;gap:4px;background:#ffffff08;padding:4px;border-radius:12px;border:1px solid rgba(255,255,255,.06)}.nav-tab{display:flex;align-items:center;gap:8px;padding:8px 16px;font-size:.9rem;font-weight:500;color:var(--text-secondary);background:transparent;border:none;border-radius:8px;cursor:pointer;transition:var(--transition)}.nav-tab:hover{color:var(--text-primary);background:#ffffff0d}.nav-tab.active{color:var(--accent-cyan);background:#00d4ff1a;box-shadow:0 2px 8px #00d4ff26}.tab-icon{font-size:1rem}.nav-right{display:flex;align-items:center;gap:16px}.language-switcher{position:relative}.language-btn{display:flex;align-items:center;gap:6px;padding:6px 12px;font-size:.85rem;color:var(--text-secondary);background:#ffffff0d;border:1px solid rgba(255,255,255,.1);border-radius:var(--radius-sm);cursor:pointer;transition:var(--transition)}.language-btn:hover{color:var(--accent-cyan);background:#00d4ff1a;border-color:var(--accent-cyan)}.language-btn svg{width:18px;height:18px}.current-lang{font-weight:500}.language-dropdown{position:absolute;top:calc(100% + 8px);right:0;min-width:120px;padding:8px;background:var(--bg-panel);border:1px solid rgba(255,255,255,.1);border-radius:var(--radius-sm);box-shadow:0 8px 24px #0006;z-index:1001;animation:fadeIn .2s ease}.lang-option{display:flex;align-items:center;gap:10px;width:100%;padding:10px 12px;font-size:.9rem;color:var(--text-secondary);background:transparent;border:none;border-radius:6px;cursor:pointer;transition:var(--transition);text-align:left}.lang-option:hover{color:var(--text-primary);background:#ffffff14}.lang-option.active{color:var(--accent-cyan);background:#00d4ff1a}.lang-flag{font-size:1.1rem}.lang-name{font-weight:500}.intro-screen{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:flex-start;justify-content:center;background:radial-gradient(ellipse at center,#1a1a2e,#0a0a0f 70%);z-index:100;overflow-y:auto;padding-top:64px}.explore-screen{position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(ellipse at center top,#1a1a2e,#0a0a0f 70%);z-index:100;overflow-y:auto;padding-top:64px}.explore-content{max-width:1200px;width:100%;margin:0 auto;padding:40px 40px 60px;animation:fadeInUp .6s ease}.explore-header{text-align:center;margin-bottom:40px}.explore-title{font-size:2rem;font-weight:700;margin-bottom:12px;background:linear-gradient(135deg,var(--accent-cyan),var(--accent-purple));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.explore-subtitle{font-size:1rem;color:var(--text-secondary)}.intro-content{text-align:center;max-width:1200px;width:100%;padding:40px;margin:60px auto auto;animation:fadeInUp .8s ease}@keyframes fadeInUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.intro-title{font-size:clamp(2.5rem,6vw,4rem);font-weight:800;margin-bottom:16px;letter-spacing:-.02em}.gradient-text{background:linear-gradient(135deg,var(--accent-cyan),var(--accent-purple),var(--accent-pink));background-size:200% 200%;-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:gradient-shift 4s ease infinite}@keyframes gradient-shift{0%,to{background-position:0% 50%}50%{background-position:100% 50%}}.intro-subtitle{color:var(--text-secondary);font-size:1.1rem;margin-bottom:40px}.input-group{display:flex;gap:12px;margin-bottom:24px}#topic-input{flex:1;padding:16px 24px;font-size:1.05rem;border:1px solid rgba(255,255,255,.1);border-radius:var(--radius);background:#ffffff0d;color:var(--text-primary);outline:none;transition:var(--transition)}#topic-input:focus{border-color:var(--accent-cyan);box-shadow:0 0 20px var(--glow-cyan)}#topic-input::placeholder{color:#a0a0c080}.btn-primary{display:flex;align-items:center;gap:8px;padding:16px 32px;font-size:1.05rem;font-weight:700;color:#fff;background:linear-gradient(135deg,var(--accent-cyan),var(--accent-purple));border:none;border-radius:var(--radius);cursor:pointer;transition:var(--transition);white-space:nowrap}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px var(--glow-purple)}.btn-primary:active{transform:translateY(0)}.btn-icon{font-size:1rem}.preset-topics-container{margin-bottom:24px}.preset-toggle-btn{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;font-size:.9rem;border:1px solid rgba(255,255,255,.15);border-radius:20px;background:#ffffff08;color:var(--text-secondary);cursor:pointer;transition:var(--transition);margin-bottom:16px}.preset-toggle-btn:hover{border-color:var(--accent-cyan);color:var(--accent-cyan);background:#00d4ff14}.preset-toggle-btn .toggle-icon{display:inline-block;transition:transform .3s ease;font-size:.75rem}.preset-toggle-btn.expanded .toggle-icon{transform:rotate(90deg)}.preset-topics-wrapper{overflow:hidden;transition:max-height .3s ease,opacity .3s ease,margin-top .3s ease;max-height:0;opacity:0;margin-top:0}.preset-topics-wrapper.expanded{max-height:1000px;opacity:1;margin-top:0}.preset-topics{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:24px}.preset-label{color:var(--text-secondary);font-size:.9rem;align-self:center}.preset-btn{padding:10px 20px;font-size:.9rem;border:1px solid rgba(255,255,255,.1);border-radius:20px;background:#ffffff08;color:var(--text-secondary);cursor:pointer;transition:var(--transition)}.preset-btn:hover{border-color:var(--accent-cyan);color:var(--accent-cyan);background:#00d4ff14}.api-config{margin-top:16px}.btn-text{padding:8px 16px;font-size:.85rem;border:none;background:transparent;color:var(--text-secondary);cursor:pointer;transition:var(--transition)}.btn-text:hover{color:var(--accent-gold)}.api-panel{margin-top:12px;animation:fadeIn .3s ease}.api-panel input{width:100%;max-width:360px;padding:12px 16px;font-size:.9rem;border:1px solid rgba(255,255,255,.1);border-radius:var(--radius-sm);background:#ffffff0d;color:var(--text-primary);outline:none}.api-panel input:focus{border-color:var(--accent-gold)}.api-panel small{display:block;margin-top:8px;color:var(--text-secondary);font-size:.8rem}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.player-top-bar{position:fixed;top:0;left:0;right:0;height:48px;display:flex;align-items:center;justify-content:space-between;padding:0 16px;background:#0a0a0fd9;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,.06);z-index:2100}.player-back-btn{display:flex;align-items:center;gap:6px;padding:6px 12px;font-size:.9rem;color:var(--text-secondary);background:#ffffff0d;border:1px solid rgba(255,255,255,.1);border-radius:var(--radius-sm);cursor:pointer;transition:var(--transition)}.player-back-btn:hover{color:var(--accent-cyan);background:#00d4ff1a;border-color:var(--accent-cyan)}.player-title{font-size:1rem;font-weight:600;color:var(--text-primary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:50%}.player-top-right{width:80px}.app.is-playing .player-screen{padding-top:48px}.player-screen{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;background:var(--bg-primary);z-index:2000}.app.is-playing .top-nav{display:none}.render-container{flex:1;position:relative;overflow:hidden;background:#000}#canvas-2d,#three-container{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%}#three-container canvas{display:block}.storyboard-title{position:absolute;top:8%;left:50%;transform:translate(-50%);font-size:2.5rem;font-weight:700;color:#00d4ffe6;text-shadow:0 0 30px rgba(0,212,255,.5),0 2px 8px rgba(0,0,0,.6);z-index:20;pointer-events:none;text-align:center;max-width:80%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;transition:opacity .3s ease;opacity:1}.storyboard-title.hidden{opacity:0}.center-play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:80px;height:80px;cursor:pointer;z-index:20;transition:all .3s ease;opacity:1}.center-play-btn:hover{transform:translate(-50%,-50%) scale(1.1);opacity:.9}.center-play-btn.hidden{opacity:0;pointer-events:none}.center-play-btn svg{width:100%;height:100%;filter:drop-shadow(0 0 20px rgba(0,212,255,.5))}.overlay-layer{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:10}.formula-overlay{position:absolute;padding:20px 30px;background:#0009;border-radius:var(--radius);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);opacity:0;transition:opacity .5s ease,transform .5s ease}.formula-overlay.visible{opacity:1}.formula-overlay .katex{font-size:1.8rem;color:var(--accent-cyan)}.formula-overlay.top-left{top:40px;left:40px}.formula-overlay.top-right{top:40px;right:40px}.formula-overlay.bottom-left{bottom:100px;left:40px}.formula-overlay.bottom-right{bottom:100px;right:40px}.formula-overlay.center{top:50%;left:50%;transform:translate(-50%,-50%)}.text-overlay{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:flex-start;justify-content:flex-start;flex-direction:column;padding:40px;pointer-events:none}.text-overlay-item{padding:20px 40px;font-size:clamp(2rem,5vw,3.5rem);font-weight:800;text-align:left;opacity:0;transition:opacity .6s ease,transform .6s ease}.text-overlay-item.visible{opacity:1}.text-overlay-item.fade-in-scale{animation:fadeInScale .8s ease forwards}.text-overlay-item.fade-in-up{animation:fadeInUp .8s ease forwards}.text-overlay-item.glow-pulse{animation:glowPulse 2s ease-in-out infinite}@keyframes fadeInScale{0%{opacity:0;transform:scale(.8)}to{opacity:1;transform:scale(1)}}@keyframes glowPulse{0%,to{text-shadow:0 0 20px var(--glow-cyan),0 0 40px var(--glow-purple);transform:scale(1)}50%{text-shadow:0 0 40px var(--glow-cyan),0 0 80px var(--glow-purple);transform:scale(1.05)}}.subtitle-bar{position:absolute;bottom:100px;left:50%;transform:translate(-50%);max-width:70%;padding:16px 32px;font-size:1.2rem;line-height:1.6;text-align:center;color:#fff;background:#000000b3;border-radius:var(--radius);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);opacity:0;transition:opacity .4s ease;z-index:20}.subtitle-bar.visible{opacity:1}.transition-layer{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:30;background:transparent}.transition-layer.fade-in{animation:transitionFadeIn .6s ease forwards}.transition-layer.fade-out{animation:transitionFadeOut .6s ease forwards}@keyframes transitionFadeIn{0%{background:#000}to{background:transparent}}@keyframes transitionFadeOut{0%{background:transparent}to{background:#000}}.control-bar{display:flex;flex-direction:column;gap:8px;padding:10px 20px;background:var(--bg-panel);border-top:1px solid rgba(255,255,255,.05);z-index:50}.control-row-first{width:100%}.control-row-second{display:flex;align-items:center;justify-content:space-between;gap:12px}.control-left,.control-right{display:flex;align-items:center;gap:12px}.feedback-btn-group{display:flex;align-items:center;gap:8px;padding:0 8px;border-left:1px solid rgba(255,255,255,.1);border-right:1px solid rgba(255,255,255,.1)}.feedback-btn{position:relative;transition:all .3s ease}.feedback-btn:hover{transform:scale(1.1)}.feedback-btn.active-like{color:#ff4757;background:#ff475726}.feedback-btn.active-like:hover{background:#ff475740}.feedback-btn.active-dislike{color:#747d8c;background:#747d8c26}.feedback-btn.active-dislike:hover{background:#747d8c40}.feedback-btn.active-favorite{color:#ffa502;background:#ffa50226}.feedback-btn.active-favorite:hover{background:#ffa50240}.control-btn{width:40px;height:40px;display:flex;align-items:center;justify-content:center;border:none;border-radius:50%;background:#ffffff0d;color:var(--text-primary);cursor:pointer;transition:var(--transition)}.control-btn:hover{background:#ffffff1a;color:var(--accent-cyan)}.control-back-btn{background:#00d4ff26;border:1px solid rgba(0,212,255,.3)}.control-back-btn:hover{background:#00d4ff40;box-shadow:0 0 12px var(--glow-cyan)}.time-display{font-size:.9rem;color:var(--text-secondary);font-variant-numeric:tabular-nums;min-width:100px}.progress-bar{position:relative;height:6px;background:#ffffff1a;border-radius:3px;cursor:pointer;transition:height .2s ease}.progress-bar:hover{height:8px}.progress-fill{position:absolute;left:0;top:0;height:100%;background:linear-gradient(90deg,var(--accent-cyan),var(--accent-purple));border-radius:3px;transition:width .1s linear}.progress-thumb{position:absolute;top:50%;width:14px;height:14px;background:var(--accent-cyan);border-radius:50%;transform:translate(-50%,-50%) scale(0);transition:transform .2s ease;box-shadow:0 0 10px var(--glow-cyan)}.progress-bar:hover .progress-thumb{transform:translate(-50%,-50%) scale(1)}.scene-markers{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none}.scene-marker{position:absolute;top:50%;width:3px;height:12px;background:#ffffff4d;border-radius:2px;transform:translate(-50%,-50%)}.speed-select{padding:8px 12px;font-size:.85rem;border:1px solid rgba(255,255,255,.1);border-radius:var(--radius-sm);background:#ffffff0d;color:var(--text-primary);cursor:pointer;outline:none}.speed-select:hover{border-color:var(--accent-cyan)}.scene-sidebar{position:absolute;top:0;right:0;width:320px;height:100%;background:var(--bg-panel);border-left:1px solid rgba(255,255,255,.05);z-index:60;display:flex;flex-direction:column;animation:slideInRight .3s ease}@keyframes slideInRight{0%{transform:translate(100%)}to{transform:translate(0)}}.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid rgba(255,255,255,.05)}.sidebar-header h3{font-size:1.1rem;font-weight:600}.close-btn{width:32px;height:32px;display:flex;align-items:center;justify-content:center;border:none;border-radius:50%;background:#ffffff0d;color:var(--text-primary);font-size:1.5rem;cursor:pointer;transition:var(--transition)}.close-btn:hover{background:#ffffff1a}.scene-list{flex:1;overflow-y:auto;padding:12px}.scene-item{padding:14px 16px;margin-bottom:8px;border-radius:var(--radius-sm);background:#ffffff08;border:1px solid rgba(255,255,255,.05);cursor:pointer;transition:var(--transition)}.scene-item:hover{background:#ffffff0f;border-color:var(--accent-cyan)}.scene-item.active{background:#00d4ff1a;border-color:var(--accent-cyan)}.scene-item-title{font-size:.95rem;font-weight:600;margin-bottom:4px}.scene-item-time{font-size:.8rem;color:var(--text-secondary)}.loading-overlay{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;background:#0a0a0feb;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:2100;transition:opacity .5s ease}.loading-content{text-align:center;display:flex;flex-direction:column;align-items:center;gap:24px}.loading-rings{position:relative;width:80px;height:80px;display:flex;align-items:center;justify-content:center}.loading-ring{position:absolute;border-radius:50%;border:2px solid transparent;opacity:0}.loading-ring.ring-1{width:100%;height:100%;border-top-color:var(--accent-cyan);border-right-color:#00d4ff4d;animation:ringRotate 1.8s ease-in-out infinite,ringPulse 1.8s ease-in-out infinite}.loading-ring.ring-2{width:75%;height:75%;border-top-color:var(--accent-purple);border-left-color:#a855f74d;animation:ringRotate 2.2s linear infinite reverse,ringPulse 2.2s ease-in-out .3s infinite}.loading-ring.ring-3{width:50%;height:50%;border-bottom-color:var(--accent-cyan);border-left-color:#00d4ff40;animation:ringRotate 1.5s linear infinite,ringPulse 1.5s ease-in-out .6s infinite}.loading-ring.ring-4{width:25%;height:25%;border-top-color:var(--accent-purple);border-right-color:#a855f766;animation:ringRotate .9s linear infinite reverse,ringPulse .9s ease-in-out .2s infinite}@keyframes ringRotate{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes ringPulse{0%,to{opacity:.3}50%{opacity:1}}.loading-waveform{display:flex;align-items:flex-end;justify-content:center;gap:6px;height:40px}.loading-bar{width:5px;border-radius:3px;background:linear-gradient(to top,var(--accent-cyan),var(--accent-purple));animation:waveDance 1.2s ease-in-out infinite}.loading-bar.bar-1{animation-delay:0s;height:16px}.loading-bar.bar-2{animation-delay:.1s;height:24px}.loading-bar.bar-3{animation-delay:.2s;height:32px}.loading-bar.bar-4{animation-delay:.3s;height:40px}.loading-bar.bar-5{animation-delay:.4s;height:32px}.loading-bar.bar-6{animation-delay:.5s;height:24px}.loading-bar.bar-7{animation-delay:.6s;height:16px}@keyframes waveDance{0%,to{transform:scaleY(.4);opacity:.5}50%{transform:scaleY(1);opacity:1}}.loading-text{color:var(--text-secondary);font-size:1rem;transition:color .5s ease;letter-spacing:.05em}.loading-text.stage-loading{color:var(--accent-cyan)}.loading-text.stage-caching{color:var(--accent-purple)}.loading-text.stage-ready{color:var(--accent-green)}.gen-progress-container{margin-top:24px;width:320px;max-width:80vw}.gen-progress-bar{position:relative;height:8px;background:#ffffff1a;border-radius:4px;overflow:hidden}.gen-progress-fill{height:100%;width:0%;background:linear-gradient(90deg,var(--accent-cyan),var(--accent-purple));border-radius:4px;transition:width .5s ease}.gen-progress-info{display:flex;justify-content:space-between;align-items:center;margin-top:10px}#gen-progress-percent{font-size:1.1rem;font-weight:700;color:var(--accent-cyan);font-variant-numeric:tabular-nums}#gen-progress-message{font-size:.85rem;color:var(--text-secondary)}.error-toast{position:absolute;bottom:100px;left:50%;transform:translate(-50%);padding:14px 28px;background:#ef4444e6;color:#fff;border-radius:var(--radius);font-weight:600;z-index:300;animation:toastIn .4s ease,toastOut .4s ease 3.5s forwards}@keyframes toastIn{0%{opacity:0;transform:translate(-50%) translateY(20px)}to{opacity:1;transform:translate(-50%) translateY(0)}}@keyframes toastOut{0%{opacity:1}to{opacity:0}}.login-prompt-modal{position:fixed;top:0;right:0;bottom:0;left:0;z-index:5000;display:flex;align-items:center;justify-content:center;background:#0009;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);animation:fadeIn .2s ease}.login-prompt-content{background:var(--bg-panel, #1e1e2e);border:1px solid rgba(255,255,255,.1);border-radius:var(--radius, 12px);padding:32px;min-width:360px;max-width:90vw;box-shadow:0 20px 60px #00000080;text-align:center}.login-prompt-title{font-size:20px;font-weight:700;color:#fff;margin-bottom:12px}.login-prompt-message{font-size:15px;color:#ffffffb3;margin-bottom:28px;line-height:1.5}.login-prompt-actions{display:flex;justify-content:center;gap:16px}.login-prompt-btn{padding:10px 24px;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;border:none;transition:background .2s,transform .1s}.login-prompt-btn:active{transform:scale(.97)}.login-prompt-btn-cancel{background:#ffffff1a;color:#ffffffb3}.login-prompt-btn-cancel:hover{background:#ffffff26;color:#fff}.login-prompt-btn-confirm{background:var(--accent, #6366f1);color:#fff}.login-prompt-btn-confirm:hover{background:var(--accent-hover, #4f46e5)}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#ffffff1a;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#fff3}.user-logged-out .btn-login{padding:10px 20px;font-size:.9rem;color:var(--accent-cyan);border:1px solid var(--accent-cyan);border-radius:var(--radius-sm);text-decoration:none;transition:var(--transition)}.user-logged-out .btn-login:hover{background:#00d4ff1a;box-shadow:0 0 12px var(--glow-cyan)}.user-logged-in,.avatar-wrapper{position:relative}.avatar-btn{width:40px;height:40px;border-radius:50%;border:2px solid var(--accent-cyan);background:linear-gradient(135deg,var(--accent-cyan),var(--accent-purple));cursor:pointer;overflow:hidden;display:flex;align-items:center;justify-content:center;transition:var(--transition);padding:0}.avatar-btn:hover{transform:scale(1.05);box-shadow:0 0 16px var(--glow-cyan)}.avatar-text{font-size:1rem;font-weight:700;color:#fff;-webkit-user-select:none;user-select:none}.avatar-dropdown{position:absolute;top:50px;right:0;width:180px;background:var(--bg-panel);border:1px solid rgba(255,255,255,.08);border-radius:var(--radius);box-shadow:0 8px 32px #00000080;overflow:hidden;animation:dropdownFadeIn .2s ease;z-index:20}@keyframes dropdownFadeIn{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.dropdown-user-info{padding:12px 16px;border-bottom:1px solid rgba(255,255,255,.05)}.dropdown-username{font-size:.95rem;font-weight:600;color:var(--text-primary)}.dropdown-divider{height:1px;background:#ffffff14;margin:4px 0}.dropdown-item{display:block;padding:10px 16px;font-size:.9rem;color:var(--text-primary);text-decoration:none;background:transparent;border:none;width:100%;text-align:left;cursor:pointer;transition:var(--transition)}.dropdown-item:hover{background:#ffffff0d;color:var(--accent-cyan)}.dropdown-item-btn{font-family:inherit}.dropdown-item-btn:hover{background:#ef444426;color:var(--accent-pink)}.btn-text-small{padding:6px 12px;font-size:.85rem;border:1px solid rgba(255,255,255,.1);border-radius:var(--radius-sm);background:transparent;color:var(--text-secondary);cursor:pointer;transition:var(--transition)}.btn-text-small:hover{border-color:var(--accent-pink);color:var(--accent-pink)}.knowledge-section{margin-top:40px;width:100%;max-width:800px;animation:fadeInUp .6s ease}.knowledge-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;padding-bottom:12px;border-bottom:1px solid rgba(255,255,255,.08)}.knowledge-title{font-size:1.3rem;font-weight:700;color:var(--text-primary)}.knowledge-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;margin-bottom:20px}.knowledge-card{padding:20px;background:#ffffff08;border:1px solid rgba(255,255,255,.08);border-radius:var(--radius);cursor:pointer;transition:var(--transition);position:relative}.knowledge-card:hover{background:#ffffff0f;border-color:var(--accent-cyan);transform:translateY(-2px);box-shadow:0 8px 24px #0000004d}.knowledge-card-title{font-size:1.05rem;font-weight:600;color:var(--text-primary);margin-bottom:8px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.knowledge-card-info{display:flex;align-items:center;gap:12px;font-size:.85rem;color:var(--text-secondary)}.knowledge-card-duration{display:flex;align-items:center;gap:4px}.knowledge-card-likes{display:flex;align-items:center;gap:4px;color:var(--accent-pink, #f472b6)}.knowledge-card-plays{display:flex;align-items:center;gap:4px;color:var(--text-secondary)}.knowledge-card-date{font-size:.8rem;color:#a0a0c099}.knowledge-card-header{display:flex;align-items:flex-start;justify-content:space-between;gap:8px;margin-bottom:8px}.knowledge-card-category{flex-shrink:0;padding:2px 10px;background:#22d3ee1f;border:1px solid rgba(34,211,238,.25);border-radius:12px;font-size:.75rem;color:var(--accent-cyan);white-space:nowrap}.knowledge-card-stat{display:flex;align-items:center;gap:4px}.knowledge-card-footer{display:flex;align-items:center;justify-content:space-between;margin-top:10px}.knowledge-card-actions{position:absolute;top:12px;right:12px;display:flex;gap:8px;opacity:0;transition:var(--transition)}.knowledge-card:hover .knowledge-card-actions{opacity:1}.btn-card-action{width:28px;height:28px;display:flex;align-items:center;justify-content:center;border:none;border-radius:50%;background:#ffffff1a;color:var(--text-secondary);cursor:pointer;font-size:.9rem;transition:var(--transition)}.btn-card-action:hover{background:#ef4444cc;color:#fff}.popular-knowledge-container{margin-top:48px;padding:32px;background:#ffffff05;border:1px solid rgba(255,255,255,.06);border-radius:var(--radius);animation:fadeInUp .8s ease}.popular-knowledge-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.popular-knowledge-title{display:flex;align-items:center;gap:12px;font-size:1.5rem;font-weight:700;color:var(--text-primary);margin:0}.popular-knowledge-title .title-icon{font-size:1.8rem}.popular-knowledge-title .title-text{background:linear-gradient(135deg,var(--accent-cyan),var(--accent-purple));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.popular-knowledge-more{font-size:.9rem;color:var(--accent-cyan);text-decoration:none;transition:var(--transition)}.popular-knowledge-more:hover{color:var(--accent-purple);transform:translate(4px)}.popular-knowledge-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}.knowledge-empty{text-align:center;padding:40px 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ease,padding .3s ease}.scroll-loading.visible{opacity:1;max-height:80px;padding:24px 0}.scroll-loading-spinner{width:24px;height:24px;border:2px solid rgba(255,255,255,.1);border-top-color:var(--accent-cyan);border-radius:50%;animation:spin .8s linear infinite}.scroll-no-more{display:flex;align-items:center;justify-content:center;padding:0;color:#a0a0c080;font-size:.85rem;opacity:0;max-height:0;overflow:hidden;transition:opacity .3s ease,max-height .3s ease,padding .3s ease}.scroll-no-more.visible{opacity:1;max-height:60px;padding:20px 0}.scroll-error{display:flex;align-items:center;justify-content:center;gap:8px;padding:0;color:#f87171;font-size:.9rem;cursor:pointer;opacity:0;max-height:0;overflow:hidden;transition:opacity .3s ease,max-height .3s ease,padding .3s ease}.scroll-error.visible{opacity:1;max-height:60px;padding:20px 0}.scroll-error:hover{color:#ef4444}@media (max-width: 768px){.search-overlay{padding-top:60px}.search-container{width:95%;max-height:calc(100vh - 80px)}.search-options{flex-direction:column;align-items:flex-start}.search-filters{width:100%}.search-filter-select{flex:1}.search-pagination{flex-wrap:wrap}.search-page-jump{margin-left:0;margin-top:8px}}@media (max-width: 480px){.search-container{width:98%}.search-input-wrapper{padding:12px 16px}.global-search-input{font-size:1rem}.search-results{padding:12px 16px}.search-result-card{padding:12px}}