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saturate(180%);--footer-bg:#f8fafc;--panel-bg:var(--bg-surface);--container-bg:var(--bg-surface);--container-shadow:var(--panel-shadow);--card-bg:#ffffff;--playlist-bg:transparent;--item-hover:#f1f5f9;--item-active:#eff6ff;--thumb-bg:#e2e8f0;--thumb-icon:#94a3b8;--video-bg:#000;--upload-bg:rgba(255,255,255,0.95);--tooltip-bg:rgba(15,23,42,0.9);--btn-disabled-bg:#e2e8f0;--btn-disabled-color:#94a3b8;--delete-bg-default:rgba(0,0,0,0.05);--delete-icon-color:#64748b;--delete-icon-hover-color:#ef4444;--delete-bg-hover:#fef2f2;--shortcut-bg:#f1f5f9;--tips-bg:#f1f5f9;--support-bg:#f8fafc;--drag-overlay:rgba(59,130,246,0.1);--fullscreen-btn:rgba(0,0,0,0.2);--fullscreen-btn-hover:rgba(0,0,0,0.4)}#playlist-container{flex:1 1;overflow-y:auto;min-height:0}.dark-theme{--bg-main:#0b1120;--bg-surface:#151e32;--bg-glass:rgba(11,17,32,0.85);--primary-color:#06b6d4;--primary-hover:#22d3ee;--accent-color:#3b82f6;--accent-hover:#60a5fa;--text-color:#e2e8f0;--text-strong:#f8fafc;--text-secondary:#94a3b8;--text-light:#64748b;--text-muted:#475569;--panel-shadow:0 10px 30px -10px rgba(0,0,0,0.8),inset 0 1px 0 rgba(255,255,255,0.05);--floating-shadow:0 25px 50px -12px rgba(0,0,0,1),0 0 0 1px rgba(255,255,255,0.02);--glass-shadow:0 4px 30px rgba(0,0,0,0.5),0 0 15px rgba(6,182,212,0.03);--border-color:rgba(255,255,255,0.03);--border-light:transparent;--border-highlight:rgba(6,182,212,0.3);--btn-bg:rgba(255,255,255,0.03);--btn-hover:rgba(6,182,212,0.15);--btn-shadow:0 4px 6px rgba(0,0,0,0.3);--btn-hover-shadow:0 0 15px rgba(6,182,212,0.3);--input-bg:rgba(0,0,0,0.2);--slider-bg:#334155;--header-bg:rgba(11,17,32,0.7);--header-backdrop:blur(20px) saturate(150%);--footer-bg:#0b1120;--panel-bg:var(--bg-surface);--container-bg:var(--bg-surface);--container-shadow:var(--panel-shadow);--card-bg:#151e32;--playlist-bg:rgba(0,0,0,0.2);--item-hover:rgba(255,255,255,0.05);--item-active:rgba(6,182,212,0.1);--thumb-bg:#0f172a;--thumb-icon:#64748b;--video-bg:#000;--upload-bg:rgba(11,17,32,0.95);--tooltip-bg:#1e293b;--delete-bg-default:rgba(255,255,255,0.05);--delete-icon-color:#94a3b8;--delete-icon-hover-color:#f87171;--delete-bg-hover:rgba(255,255,255,0.1);--shortcut-bg:rgba(255,255,255,0.05);--tips-bg:#151e32;--support-bg:rgba(0,0,0,0.2);--btn-disabled-bg:#1e293b;--btn-disabled-color:#475569;--drag-overlay:rgba(6,182,212,0.2);--fullscreen-btn:rgba(255,255,255,0.1);--fullscreen-btn-hover:rgba(255,255,255,0.2);--btn-gradient:linear-gradient(135deg,#06b6d4,#3b82f6)}@media (max-width:1200px){.player-body{flex-direction:column;gap:20px;height:auto;max-height:none;overflow:visible;flex-wrap:nowrap}.main-content{flex:none;width:100%;height:auto}.video-container{max-height:none;min-height:380px;height:auto}}@media (max-width:768px){.progress-container{flex-direction:column;align-items:flex-start}.upload-text{font-size:1.4rem}.empty-state-guide{padding:15px;gap:20px}.guide-title{font-size:1.5rem}.guide-subtitle{font-size:1rem}.guide-steps,.guide-support,.guide-tips{padding:16px}.steps-title,.tips-title{font-size:1.2rem}.support-title{font-size:1.1rem}.step-description,.support-description,.tip-item{font-size:.9rem}.primary-btn{padding:12px 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.playlist-header h2,[dir=rtl] .playlist-header i,[dir=rtl] .playlist-header span,[dir=rtl] .playlist-item,[dir=rtl] .playlist-section{text-align:right}[dir=rtl] .item-thumb{margin-left:12px;margin-right:0}[dir=rtl] .delete-btn{right:auto;left:8px}[dir=rtl] .empty-playlist{text-align:right;align-items:flex-end}[dir=rtl] .player-footer{text-align:right}[dir=rtl] .shortcuts{flex-direction:row-reverse}[dir=ltr] .player-footer{text-align:center}[dir=ltr] .shortcuts{flex-direction:row;justify-content:center}[dir=rtl] .ctrl-btn .tooltip{left:auto;right:50%;transform:translateX(50%)}@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}.optimized-image{transition:opacity .3s ease-in-out}.optimized-image.loading{opacity:.7}.optimized-image.loaded{opacity:1}.optimized-image-error{display:flex;align-items:center;justify-content:center;background-color:#f0f0f0;color:#666;font-size:12px;border:1px solid #ddd;border-radius:4px}.dark-theme .optimized-image-error{background-color:#2a2a2a;color:#999;border-color:#444}.preloading{animation:pulse 1.5s ease-in-out infinite}@keyframes pulse{0%{opacity:.6}50%{opacity:1}to{opacity:.6}}@media (prefers-reduced-motion:reduce){.optimized-image,.preloading{animation:none;transition:none}}@media (max-width:480px){.container{margin:0;border-radius:0}.player-body{padding:12px;gap:12px}.video-container{min-height:250px!important;border-radius:8px}.upload-text{font-size:1.2rem}.upload-hint{font-size:1rem}.btn{padding:14px 20px!important;font-size:16px!important;min-height:48px!important}.btn-small{padding:12px 16px!important;font-size:14px!important;min-height:44px!important}}@media (orientation:landscape) and (max-height:500px){.player-header{padding:8px 20px!important}.player-footer{padding:8px 25px!important}.video-container{min-height:200px!important}.player-body{padding:12px 20px}}@media (orientation:portrait) and (max-width:768px){.video-container{min-height:380px!important;max-height:none!important;height:auto!important}.playlist-container{max-height:35vh!important}}@media (-webkit-min-device-pixel-ratio:2),(min-resolution:192dpi){.logo,.optimized-image{image-rendering:-webkit-optimize-contrast;image-rendering:crisp-edges}.upload-icon{font-size:4rem}.fullscreen-icon{font-size:1.2rem}}@media (max-width:768px){:root{--vh:1vh}.container{min-height:calc(var(--vh, 1vh) * 100)}.player-body{min-height:calc(var(--vh, 1vh) * 100 - 150px)}}@media (prefers-color-scheme:dark) and (max-width:768px){.btn,.btn-small{-webkit-tap-highlight-color:rgba(255,255,255,.1)}}@media (prefers-color-scheme:light) and (max-width:768px){.btn,.btn-small{-webkit-tap-highlight-color:rgba(0,0,0,.1)}}@media (prefers-contrast:high){.btn,.btn-small,.video-container{border:2px solid!important}.playlist-item{border:1px solid!important}}@media (max-width:768px){.btn,.btn-small,.playlist-item,.video-container{will-change:transform;transform:translateZ(0)}.playlist-container{overflow-anchor:none}.optimized-image,.playlist-container{contain:layout style paint}.btn-small:disabled,.btn:disabled,button:disabled{opacity:.6;cursor:not-allowed;transform:none!important}[role=link]:focus,a:focus{text-decoration:underline;background-color:rgba(52,152,219,.1)}}.video-container{position:relative;background:black;border-radius:16px;overflow:hidden;flex:1 1;cursor:pointer;min-height:320px;height:100%;box-sizing:border-box;display:flex;align-items:center;box-shadow:0 0 0 1px var(--border-light),var(--panel-shadow);transition:box-shadow .3s ease}.video-container:hover{box-shadow:0 0 0 1px var(--border-highlight),0 0 20px rgba(6,182,212,.15)}#video-player{width:100%;height:100%;display:block;object-fit:contain}.upload-area{position:absolute;top:0;left:0;width:100%;height:100%;display:flex;flex-direction:column;justify-content:center;align-items:center;background:var(--upload-bg);z-index:10;gap:10px}.upload-area.hidden{display:none}.upload-icon{font-size:5rem;color:var(--accent-color)}.upload-text{font-size:1.8rem;text-align:center;max-width:80%;color:var(--text-strong);margin:0}.upload-hint{font-size:1.1rem;color:var(--text-light);text-align:center}.empty-state-guide{width:100%;max-width:800px;padding:20px;display:flex;flex-direction:column;gap:24px;text-align:left;overflow-y:auto;max-height:100%}.guide-header{text-align:center;margin-bottom:10px}.guide-title{font-size:1.8rem;color:var(--text-strong);margin:10px 0 5px;font-weight:600}.guide-subtitle{font-size:1.1rem;color:var(--text-light);margin:0}.guide-steps{background:var(--card-bg);border-radius:12px;padding:20px;border:1px solid var(--border-color)}.steps-title{font-size:1.4rem;color:var(--text-strong);margin:0 0 16px;font-weight:600}.step-item{margin-bottom:16px}.step-item:last-child{margin-bottom:0}.step-title{font-size:1.1rem;color:var(--accent-color);margin:0 0 6px;font-weight:600}.step-description{font-size:.95rem;color:var(--text-normal);line-height:1.5;margin:0}.file-selection{text-align:center;padding:20px}.primary-btn{background:var(--btn-gradient);color:white;border:none;padding:14px 40px;border-radius:30px;font-size:1.1rem;font-weight:600;cursor:pointer;transition:transform .2s,box-shadow .2s;box-shadow:var(--btn-shadow);margin-bottom:10px}.primary-btn:hover{transform:translateY(-2px);box-shadow:var(--btn-shadow-hover)}.guide-tips{background:var(--tips-bg);border-radius:12px;padding:20px;border:1px solid var(--border-color)}.tips-title{font-size:1.4rem;color:var(--text-strong);margin:0 0 16px;font-weight:600}.tips-list{list-style:none;padding:0;margin:0}.tip-item{font-size:.95rem;color:var(--text-normal);line-height:1.5;margin-bottom:10px;padding-left:0}.tip-item:last-child{margin-bottom:0}.guide-support{background:var(--support-bg);border-radius:12px;padding:20px;border:1px solid var(--border-color);text-align:center}.support-title{font-size:1.3rem;color:var(--text-strong);margin:0 0 12px;font-weight:600}.support-description{font-size:.95rem;color:var(--text-normal);line-height:1.5;margin:0}.file-input{display:none}.fullscreen-icon{position:absolute;top:15px;right:15px;background:var(--fullscreen-btn);border-radius:50%;width:40px;height:40px;display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:20;opacity:0;transition:opacity .3s}.video-container:hover 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