:root{--primary: #0ea5e9;--primary-hover: #0284c7;--primary-light: #38bdf8;--primary-dark: #0369a1;--success: #10b981;--success-hover: #059669;--success-light: #34d399;--danger: #ef4444;--danger-hover: #dc2626;--danger-light: #f87171;--warning: #f59e0b;--warning-hover: #d97706;--warning-light: #fbbf24;--info: #3b82f6;--info-hover: #2563eb;--info-light: #60a5fa;--accent: #06b6d4;--accent-hover: #0891b2;--status-ready: #10b981;--status-processing: #f59e0b;--status-error: #ef4444;--bg-primary: #0f172a;--bg-secondary: #1e293b;--bg-tertiary: #334155;--bg-hover: #475569;--bg-modal: rgba(15, 23, 42, .98);--text-primary: #f8fafc;--text-secondary: #cbd5e1;--text-muted: #94a3b8;--text-on-primary: #ffffff;--border-color: #475569;--border-light: #64748b;--border-hover: #94a3b8;--secondary: #6b7280;--secondary-hover: #4b5563;--cell-valid: rgba(16, 185, 129, .15);--cell-empty: rgba(245, 158, 11, .15);--cell-invalid: rgba(239, 68, 68, .15);--cell-duplicate: rgba(14, 165, 233, .15);--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-normal: .3s cubic-bezier(.4, 0, .2, 1);--shadow-sm: 0 1px 2px 0 rgba(14, 165, 233, .05);--shadow-md: 0 4px 6px -1px rgba(14, 165, 233, .1);--shadow-lg: 0 10px 15px -3px rgba(14, 165, 233, .15);--shadow-xl: 0 20px 40px rgba(14, 165, 233, .1);--gradient-primary: linear-gradient(135deg, var(--primary), var(--accent))}html,body,#root{height:100%}*{margin:0;padding:0;box-sizing:border-box;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica 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0;position:sticky;top:0;z-index:1000;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);box-shadow:var(--shadow-sm)}.header-content{display:flex;justify-content:space-between;align-items:center}.header-logo{display:flex;align-items:center;gap:1rem;text-decoration:none}.header-logo-icon{display:flex;align-items:center;justify-content:center;width:40px;height:40px;background:var(--gradient-primary);border-radius:10px;color:var(--text-on-primary);font-size:1.25rem;flex-shrink:0;box-shadow:var(--shadow-sm)}.header-logo-text h1{font-size:1.5rem;font-weight:700;background:linear-gradient(to right,var(--primary),var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:.25rem;letter-spacing:-.025em}.header-logo-text p{font-size:.875rem;color:var(--text-muted);font-weight:500}.header-hamburger-menu{display:none;flex-direction:column;justify-content:space-between;width:30px;height:21px;background:transparent;border:none;cursor:pointer;padding:0;z-index:1001}.header-hamburger-menu span{width:100%;height:3px;background-color:var(--text-primary);border-radius:2px;transition:all .3s ease}.header-hamburger-menu.active span:nth-child(1){transform:translateY(9px) rotate(45deg)}.header-hamburger-menu.active span:nth-child(2){opacity:0}.header-hamburger-menu.active span:nth-child(3){transform:translateY(-9px) rotate(-45deg)}.header-nav-links{display:flex;gap:2rem;align-items:center}.header-nav-link{color:var(--text-secondary);text-decoration:none;font-weight:500;font-size:.9375rem;transition:var(--transition-fast);position:relative;cursor:pointer;padding:.5rem 0}.header-nav-link:hover{color:var(--text-primary)}.header-nav-link.active{color:var(--primary)}.header-nav-link.active:after{content:"";position:absolute;bottom:0;left:0;width:100%;height:2px;background:var(--gradient-primary);border-radius:1px}.header-download-nav-btn{display:inline-flex;align-items:center;gap:.5rem;padding:.625rem 1.25rem;background:var(--gradient-primary);color:var(--text-on-primary);border:none;border-radius:8px;font-weight:500;font-size:.875rem;cursor:pointer;transition:var(--transition-fast);text-decoration:none;white-space:nowrap;min-height:40px;box-shadow:var(--shadow-sm)}.header-download-nav-btn:hover:not(.disabled){transform:translateY(-1px);box-shadow:var(--shadow-md)}.header-download-nav-btn.disabled{background:var(--secondary);opacity:.5;cursor:not-allowed;transform:none!important;box-shadow:none}.header-mobile-menu-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background-color:#0f172afa;z-index:999;display:none;flex-direction:column;justify-content:center;align-items:center;gap:1.5rem;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.header-mobile-menu-overlay.active{display:flex}.header-mobile-nav-link{color:var(--text-primary);text-decoration:none;font-size:1.5rem;font-weight:600;transition:var(--transition-fast);padding:.75rem 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2rem;border:none;border-radius:10px;font-weight:500;font-size:1rem;cursor:pointer;transition:var(--transition-fast);text-decoration:none;min-height:48px}.hero-cta-btn.primary{background:var(--gradient-primary);color:var(--text-on-primary);box-shadow:var(--shadow-md)}.hero-cta-btn.primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.hero-cta-btn.secondary{background-color:transparent;color:var(--primary);border:2px solid var(--primary)}.hero-cta-btn.secondary:hover{background-color:#0ea5e91a;transform:translateY(-2px);box-shadow:var(--shadow-sm)}@media(max-width:1024px){.hero-title{font-size:3rem}}@media(max-width:768px){.hero-title{font-size:2.5rem}.hero-description{font-size:1.125rem}.hero-cta{flex-direction:column;align-items:center}}@media(max-width:480px){.hero-title{font-size:2rem}}.features{background-color:var(--bg-secondary)}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.5rem}.feature-card{background-color:var(--bg-primary);padding:1.5rem;border-radius:12px;border:1px solid var(--border-color);transition:var(--transition-normal);position:relative;overflow:hidden;box-shadow:var(--shadow-sm)}.feature-card:hover{transform:translateY(-.5rem);border-color:var(--primary);box-shadow:var(--shadow-lg)}.feature-card:before{content:"";position:absolute;top:0;left:0;width:100%;height:.25rem;background:var(--gradient-primary);transform:scaleX(0);transition:transform var(--transition-normal)}.feature-card:hover:before{transform:scaleX(1)}.feature-icon{font-size:2.5rem;margin-bottom:1.5rem;background:var(--gradient-primary);-webkit-background-clip:text;background-clip:text;color:transparent}.feature-title{font-size:1.5rem;margin-bottom:1rem;font-weight:600;color:var(--text-primary)}.feature-description{color:var(--text-secondary);margin-bottom:1.5rem;font-size:1rem;line-height:1.6}.feature-tags{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1rem}.feature-tag{background-color:#0ea5e926;color:var(--primary);padding:.375rem .75rem;border-radius:1rem;font-size:.75rem;font-weight:500;border:1px solid rgba(14,165,233,.3)}@media(max-width:480px){.features-grid{grid-template-columns:1fr}}.gallery{padding:5rem 0;background:var(--bg-secondary)}.gallery .container{max-width:1200px;margin:0 auto;padding:0 1.5rem}.gallery-intro{color:var(--text-secondary);font-size:1.125rem;text-align:center;max-width:800px;margin:0 auto 3rem;line-height:1.6}.gallery-carousel-container{position:relative;width:100%;height:500px;overflow:hidden;border-radius:16px;background:var(--bg-primary);box-shadow:var(--shadow-lg);margin-bottom:2rem}.gallery-carousel-track{display:flex;transition:transform .5s ease-in-out;height:100%}.gallery-carousel-slide{flex:0 0 100%;height:100%;cursor:pointer;padding:2rem;box-sizing:border-box}.gallery-carousel-image{display:flex;flex-direction:column;height:100%;background:var(--bg-tertiary);border-radius:12px;overflow:hidden;transition:transform .3s ease}.gallery-carousel-image:hover{transform:translateY(-4px)}.gallery-image-container{flex:1;position:relative;overflow:hidden;background:var(--bg-primary);border-radius:12px 12px 0 0}.gallery-image{width:100%;height:100%;object-fit:contain;object-position:center;transition:opacity .3s ease;opacity:0}.gallery-image.loaded{opacity:1}.gallery-image-loading{position:absolute;top:0;left:0;width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:var(--bg-primary)}.gallery-image-loading i{font-size:2rem;color:var(--primary)}.gallery-image-title{padding:1.25rem;background:var(--bg-primary);border-top:1px solid var(--border-color);font-size:1.25rem;font-weight:600;color:var(--text-primary);text-align:center}.gallery-carousel-btn{position:absolute;top:50%;transform:translateY(-50%);width:50px;height:50px;background:var(--bg-primary);border:2px solid var(--border-color);border-radius:50%;color:var(--text-primary);font-size:1.25rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .3s ease;z-index:10}.gallery-carousel-btn:hover{background:var(--primary);color:var(--text-on-primary);border-color:var(--primary);box-shadow:var(--shadow-md)}.gallery-carousel-btn.prev{left:1.5rem}.gallery-carousel-btn.next{right:1.5rem}.gallery-carousel-indicators{display:flex;justify-content:center;gap:.75rem;margin-top:2rem}.gallery-indicator{width:12px;height:12px;border-radius:50%;background:var(--border-color);cursor:pointer;transition:all .3s 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i{color:var(--primary);font-size:1.25rem}.gallery-preview-close{background:transparent;border:none;color:var(--text-muted);font-size:1.5rem;cursor:pointer;width:40px;height:40px;display:flex;align-items:center;justify-content:center;border-radius:50%;transition:all .3s ease}.gallery-preview-close:hover{background:var(--bg-hover);color:var(--text-primary)}.gallery-preview-body{flex:1;position:relative;overflow:hidden;padding:2rem}.gallery-preview-navigation{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:10}.gallery-preview-nav-btn{position:absolute;top:50%;transform:translateY(-50%);width:50px;height:50px;background:var(--bg-primary);border:2px solid var(--border-color);border-radius:50%;color:var(--text-primary);font-size:1.25rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .3s 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1rem}.gallery-carousel-container{height:400px}.gallery-carousel-slide{padding:1rem}.gallery-image-title{padding:1rem;font-size:1.125rem}.gallery-carousel-btn{width:40px;height:40px;font-size:1rem}.gallery-carousel-btn.prev{left:.75rem}.gallery-carousel-btn.next{right:.75rem}.gallery-preview-container{margin:1rem;max-height:80vh}.gallery-preview-header{padding:1rem}.gallery-preview-title{font-size:1.25rem}.gallery-preview-body{padding:1rem}.gallery-preview-nav-btn{width:40px;height:40px;font-size:1rem}.gallery-preview-description{padding:1rem;font-size:.9375rem}}@media(max-width:480px){.gallery-carousel-container{height:350px}.gallery-image-title{font-size:1rem;padding:.75rem}.gallery-preview-nav-btn.prev{left:.5rem}.gallery-preview-nav-btn.next{right:.5rem}}.duplicate-section{background-color:var(--bg-secondary)}.duplicate-container{display:grid;grid-template-columns:1fr 1fr;gap:2.5rem;align-items:center}.duplicate-subtitle{font-size:1.5rem;margin-bottom:1rem;font-weight:700;color:var(--text-primary)}.duplicate-description{color:var(--text-secondary);margin-bottom:2rem;font-size:1.125rem}.duplicate-features-list{list-style:none;padding:0}.duplicate-feature-item{margin-bottom:1.5rem;padding-left:2.5rem;position:relative;color:var(--text-secondary)}.duplicate-feature-item i{color:var(--accent);position:absolute;left:0;top:.25rem;font-size:1.25rem}.duplicate-feature-item strong{color:var(--text-primary)}.duplicate-visual{background-color:var(--bg-primary);border-radius:12px;padding:1.5rem;border:1px solid var(--border-color);box-shadow:var(--shadow-md)}.duplicate-visual-title{font-size:1.5rem;margin-bottom:2rem;color:var(--accent);display:flex;align-items:center;gap:.75rem}.duplicate-controls{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-top:2rem}.duplicate-control-item{background-color:var(--bg-tertiary);padding:1rem 1.25rem;border-radius:8px;display:flex;align-items:center;gap:.75rem;transition:var(--transition-fast);border:1px solid var(--border-color)}.duplicate-control-item:hover{background-color:var(--bg-hover);border-color:var(--primary);transform:translateY(-2px);box-shadow:var(--shadow-sm)}.duplicate-control-item i{color:var(--accent);font-size:1.25rem}@media(max-width:1024px){.duplicate-container{grid-template-columns:1fr;gap:3rem}}@media(max-width:768px){.duplicate-controls{grid-template-columns:1fr}.duplicate-subtitle{font-size:1.75rem}}.videos-section{padding:5rem 0;background:var(--bg-primary)}.videos-section .container{max-width:1200px;margin:0 auto;padding:0 1.5rem}.section-title{font-size:2.5rem;font-weight:700;color:var(--text-primary);margin-bottom:1.5rem;text-align:center}.videos-intro{color:var(--text-secondary);font-size:1.125rem;text-align:center;max-width:800px;margin:0 auto 3rem;line-height:1.6}.videos-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(350px,1fr));gap:2rem;margin-bottom:3rem}.video-card{background:var(--bg-secondary);border-radius:12px;overflow:hidden;border:1px solid var(--border-color);transition:transform .3s ease,box-shadow .3s ease;height:100%;display:flex;flex-direction:column}.video-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}.video-thumbnail{position:relative;height:200px;cursor:pointer;overflow:hidden;background:linear-gradient(135deg,var(--bg-tertiary),var(--bg-primary))}.video-thumbnail-youtube{width:100%;height:100%;background:var(--bg-tertiary);display:flex;align-items:center;justify-content:center;position:relative}.video-thumbnail-youtube:before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,#0ea5e91a,#0ea5e933)}.video-thumbnail-youtube i{font-size:3rem;color:var(--primary);z-index:1;transition:transform .3s ease}.video-thumbnail:hover .video-thumbnail-youtube i{transform:scale(1.2)}.video-thumbnail.no-video{background:linear-gradient(135deg,var(--bg-tertiary),var(--bg-secondary));border-bottom:1px solid var(--border-color)}.video-thumbnail-placeholder{width:100%;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--text-muted);padding:1rem;text-align:center}.video-thumbnail-placeholder i{font-size:2.5rem;margin-bottom:.75rem;color:var(--text-muted)}.video-thumbnail-placeholder span{font-size:.95rem;font-weight:500;color:var(--text-secondary)}.video-duration{position:absolute;bottom:.75rem;right:.75rem;background:#0f172ae6;color:#fff;padding:.25rem .5rem;border-radius:4px;font-size:.875rem;font-weight:500;z-index:2}.video-info{padding:1.5rem;flex:1;display:flex;flex-direction:column}.video-header{margin-bottom:.75rem}.video-title{font-size:1.25rem;font-weight:600;color:var(--text-primary);display:flex;align-items:center;justify-content:space-between;gap:.75rem;margin:0}.video-badge-coming-soon{background:linear-gradient(135deg,#f59e0b,#d97706);color:#fff;font-size:.75rem;padding:.25rem .75rem;border-radius:12px;font-weight:600;white-space:nowrap}.video-description{color:var(--text-secondary);font-size:.95rem;line-height:1.5;margin:0 0 1rem;flex:1}.video-meta{display:flex;gap:1rem;font-size:.875rem;color:var(--text-muted);margin-top:auto}.video-meta span{display:flex;align-items:center;gap:.375rem}.video-level{background:#0ea5e91a;color:var(--primary);padding:.25rem .75rem;border-radius:12px;font-weight:500}.video-time,.video-date{padding:.25rem 0}.video-setup-info{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:12px;padding:2rem;margin-top:3rem;text-align:center}.setup-info-content{max-width:600px;margin:0 auto}.setup-info-title{font-size:1.25rem;font-weight:600;color:var(--text-primary);margin-bottom:1rem;display:flex;align-items:center;justify-content:center;gap:.75rem}.setup-info-title i{color:var(--primary)}.setup-info-description{color:var(--text-secondary);margin-bottom:1.5rem;font-size:1rem;line-height:1.5}.setup-info-steps{display:flex;justify-content:center;gap:1rem}.setup-step{display:flex;align-items:flex-start;gap:1rem;max-width:400px}.step-number{background:var(--primary);color:#fff;width:2rem;height:2rem;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:600;flex-shrink:0}.step-text{flex:1;color:var(--text-secondary);font-size:.95rem;line-height:1.5;text-align:left}.step-text small{color:var(--text-muted);font-size:.875rem;opacity:.8}.video-modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#0f172af2;z-index:2000;display:flex;justify-content:center;align-items:center;padding:2rem;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.video-modal-content{background:var(--bg-secondary);border-radius:16px;max-width:800px;width:100%;max-height:90vh;overflow-y:auto;border:1px solid var(--border-color);box-shadow:var(--shadow-xl);display:flex;flex-direction:column}.video-modal-header{padding:1.5rem 2rem;background:var(--bg-primary);border-bottom:1px solid var(--border-color);display:flex;justify-content:space-between;align-items:center}.video-modal-title{display:flex;align-items:center;gap:.75rem;font-size:1.5rem;font-weight:600;color:var(--text-primary);flex:1}.video-modal-title i{color:var(--primary);font-size:1.25rem}.modal-badge-coming-soon{background:linear-gradient(135deg,#f59e0b,#d97706);color:#fff;font-size:.875rem;padding:.25rem .75rem;border-radius:12px;font-weight:600;margin-left:.75rem}.video-modal-close{background:transparent;border:none;color:var(--text-muted);font-size:1.5rem;cursor:pointer;width:40px;height:40px;display:flex;align-items:center;justify-content:center;border-radius:50%;transition:all .3s ease}.video-modal-close:hover{background:var(--bg-hover);color:var(--text-primary)}.video-modal-preview{position:relative;background:var(--bg-tertiary);min-height:300px;display:flex;align-items:center;justify-content:center}.video-modal-youtube{position:relative;width:100%;height:400px;background:#000}.video-modal-youtube 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var(--primary);color:var(--text-primary);padding:1.5rem;border-radius:12px;font-size:1.125rem;display:flex;align-items:center;gap:1.5rem;cursor:pointer;transition:var(--transition-fast);text-align:left;border:2px solid var(--border-color);justify-content:flex-start}.download-os-btn:hover:not(:disabled){background:#0ea5e940}.download-os-btn.selected{background:#0ea5e940;border:2px solid var(--primary)}.download-os-btn:disabled{opacity:.5;cursor:not-allowed}.download-os-btn i{font-size:2rem}.download-os-title{font-weight:700;font-size:1.25rem}.download-os-subtitle{font-size:.9375rem;color:var(--text-muted)}.download-progress-container{padding:0;margin:1.5rem 0}.download-warning{background:linear-gradient(135deg,#ffc1071a,#ffc1070d);color:var(--text-primary);padding:1rem 1.25rem;border-radius:10px;margin-bottom:1.5rem;display:flex;align-items:center;gap:.75rem;font-weight:500;font-size:.95rem;border:1px solid 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h4{font-size:1.5rem;color:var(--text-primary);margin-bottom:.5rem;font-weight:700}.download-complete p{color:var(--text-muted);font-size:.95rem}.download-cancel-btn{width:100%;padding:1rem;background:linear-gradient(135deg,#64748b,#475569);color:#fff;border:none;border-radius:10px;font-size:1rem;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:.5rem;transition:all .3s cubic-bezier(.4,0,.2,1);position:relative;overflow:hidden}.download-cancel-btn:hover{background:linear-gradient(135deg,#475569,#374151);transform:translateY(-2px);box-shadow:0 10px 25px #64748b4d}.download-cancel-btn:active{transform:translateY(0)}.download-cancel-btn:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);transition:left 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i{font-size:2rem;background:var(--gradient-primary);-webkit-background-clip:text;background-clip:text;color:transparent}.footer-logo h3{font-size:1.5rem;font-weight:700;background:linear-gradient(to right,var(--primary),var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent}.footer-description{text-align:center;color:var(--text-secondary);max-width:600px;margin-bottom:1rem;font-size:1rem}.footer-copyright{margin-top:1.5rem;font-size:.875rem;color:var(--text-muted);text-align:center;width:100%;padding-top:1rem;border-top:1px solid var(--border-color)}.footer-copyright small{opacity:.7;margin-top:.5rem;display:block}.App{min-height:100vh;display:flex;flex-direction:column}.App main{flex:1}section{padding:2rem 0;scroll-margin-top:2rem}.section-title{text-align:center;font-size:2rem;font-weight:700;margin-bottom:1.5rem;position:relative;color:var(--text-primary);letter-spacing:-.025em}.section-title:after{content:"";position:absolute;bottom:-1rem;left:50%;transform:translate(-50%);width:4rem;height:.25rem;background:var(--gradient-primary);border-radius:.125rem}@media(max-width:768px){.section-title{font-size:1.5rem}section{padding:1.5rem 0}}@media(max-width:480px){.section-title{font-size:1.25rem}section{padding:1rem 0}}