:root{--background: #121212;--surface: #1E1E1E;--primary: #BB86FC;--primary-variant: #3700B3;--secondary: #03DAC6;--on-background: #FFFFFF;--on-surface: #FFFFFF;--on-primary: #000000;--on-secondary: #000000;--error: #CF6679;--border-color: #2c2c2c;--shadow-color: rgba(0, 0, 0, .2);--hover-color: rgba(255, 255, 255, .08)}*{margin:0;padding:0;box-sizing:border-box}html,body{height:100%;overflow:hidden}body{font-family:Inter,sans-serif;background-color:var(--background);color:var(--on-background);line-height:1.6}.app-header{display:flex;justify-content:space-between;align-items:center;padding:1rem 2rem;background-color:var(--surface);border-bottom:1px solid var(--border-color);position:sticky;top:0;z-index:100}.app-header 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.subtitle-text{font-size:1.3rem}.subtitle-overlay.large .subtitle-text.translated-subtitle{font-size:1.2rem}.subtitle-overlay.medium .subtitle-text{font-size:1.1rem}.subtitle-overlay.medium .subtitle-text.translated-subtitle{font-size:1rem}.subtitle-overlay.small .subtitle-text{font-size:.9rem}.subtitle-overlay.small .subtitle-text.translated-subtitle{font-size:.8rem}.subtitle-overlay .subtitle-text.merged-subtitle{max-width:95%;gap:.1rem}.subtitle-overlay .subtitle-text.merged-subtitle .original-line{font-size:1rem;line-height:1.2}.subtitle-overlay .subtitle-text.merged-subtitle .translated-line{font-size:.9rem;line-height:1.1}.subtitle-overlay.large .subtitle-text.merged-subtitle .original-line{font-size:1.2rem}.subtitle-overlay.large .subtitle-text.merged-subtitle .translated-line,.subtitle-overlay.medium .subtitle-text.merged-subtitle .original-line{font-size:1rem}.subtitle-overlay.medium .subtitle-text.merged-subtitle .translated-line{font-size:.9rem}.subtitle-overlay.small 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ease;width:40px;height:40px;display:flex;align-items:center;justify-content:center}.sidebar-toggle:hover{background:var(--primary-dark, #2c5aa0);transform:scale(1.05)}.sidebar-toggle.collapsed{background:var(--secondary-color, #718096)}.mobile-layout{grid-template-columns:1fr!important;grid-template-rows:auto auto!important}.tablet-layout{grid-template-columns:2fr 1fr!important}.tablet-layout.sidebar-collapsed{grid-template-columns:1fr!important}.desktop-layout{grid-template-columns:2fr 1fr!important}.mobile-landscape-horizontal{grid-template-columns:2fr 1fr!important;grid-template-rows:1fr!important}.mobile-landscape-horizontal .video-content{grid-column:1 / 2!important;grid-row:1!important}.mobile-landscape-horizontal .sidebar-content{grid-column:2 / 3!important;grid-row:1!important;max-height:100vh!important}@media (min-width: 768px) and (max-width: 1023px){.tablet-only{display:block!important}.tablet-layout .sidebar-content{transition:all .3s ease}.tablet-layout.sidebar-collapsed .sidebar-content{display:none}.tablet-layout.sidebar-collapsed .video-content{grid-column:1 / -1!important}}@media (max-width: 767px),(min-width: 1024px){.tablet-only{display:none!important}}@media (max-width: 768px){.app-header{padding:1rem;flex-direction:column;gap:1rem;align-items:stretch;overflow:visible;position:relative}.app-header h1{font-size:1.25rem;text-align:center}.header-controls{justify-content:center;gap:.75rem;position:relative;z-index:100}.language-selector{position:relative}.custom-dropdown{min-width:140px}.dropdown-button{font-size:.85rem;padding:.4rem .8rem}.app-main,.video-controls{padding:1rem}.controls-row{flex-wrap:nowrap;gap:1rem}.left-controls{flex-grow:1;justify-content:flex-start}.right-controls{flex-shrink:0;justify-content:flex-end}.subtitle-controls{flex-direction:column;padding:1rem}.language-selectors{flex-direction:column;width:100%;gap:.5rem;margin-top:1rem}.language-select{width:100%}.status-bar{flex-direction:column;gap:.5rem;text-align:center}.subtitle-text{font-size:1.2rem!important}.subtitle-text.translated-subtitle{font-size:1.1rem!important}}@media (max-width: 576px){.app-header h1{font-size:1.2rem}.header-controls{gap:.5rem;position:relative;z-index:100}.custom-dropdown{min-width:120px}.dropdown-button{font-size:.8rem;padding:.35rem .7rem}.icon-button{padding:.4rem}.icon-button img{width:20px;height:20px}.control-button span{display:none}.control-button{padding:.5rem}.volume-control{width:80px}.subtitle-text{font-size:1rem!important}.subtitle-text.translated-subtitle{font-size:.9rem!important}}.homepage{min-height:100vh;background:linear-gradient(135deg,#1a1a1a,#2d2d2d);color:#fff}.logo-link{text-decoration:none;color:inherit;transition:opacity .2s ease}.logo-link:hover{opacity:.8}.logo-link h1{margin:0;font-size:inherit;font-weight:inherit}.homepage-container{max-width:1200px;margin:0 auto;padding:0 20px}.homepage-header{text-align:center;padding:80px 0 60px}.homepage-title{font-size:3.5rem;font-weight:700;margin:0 0 20px;background:linear-gradient(45deg,#4f46e5,#06b6d4);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.homepage-subtitle{font-size:1.25rem;color:#a1a1aa;max-width:600px;margin:0 auto;line-height:1.6}.homepage-main{padding-bottom:80px}.url-input-section{max-width:800px;margin:0 auto 80px}.youtube-form{margin-bottom:40px}.input-group{margin-bottom:20px}.input-label{display:block;font-size:1.1rem;font-weight:500;margin-bottom:12px;color:#e4e4e7}.input-wrapper{display:flex;gap:12px;align-items:stretch}.url-input{flex:1;padding:16px 20px;font-size:1rem;border:2px solid #3f3f46;border-radius:12px;background:#27272a;color:#fff;transition:all .2s ease}.url-input:focus{outline:none;border-color:#4f46e5;box-shadow:0 0 0 3px #4f46e51a}.url-input::placeholder{color:#71717a}.submit-button{display:flex;align-items:center;gap:8px;padding:16px 24px;background:linear-gradient(45deg,#4f46e5,#06b6d4);color:#fff;border:none;border-radius:12px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s ease;white-space:nowrap}.submit-button:hover{transform:translateY(-2px);box-shadow:0 8px 25px #4f46e54d}.submit-button:active{transform:translateY(0)}.button-icon{width:18px;height:18px}.example-links{text-align:center}.example-title{font-size:1rem;color:#a1a1aa;margin:0 0 16px}.example-list{display:flex;flex-direction:column;gap:8px;max-width:400px;margin:0 auto}.example-link{padding:12px 16px;background:#3f3f46;color:#e4e4e7;border:none;border-radius:8px;font-size:.9rem;cursor:pointer;transition:all .2s ease;text-align:left}.example-link:hover{background:#52525b;color:#fff}.features-section{max-width:1000px;margin:0 auto}.features-title{font-size:2.5rem;font-weight:600;text-align:center;margin:0 0 50px;color:#fff}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:30px}.feature-card{padding:30px 24px;background:#ffffff0d;border:1px solid rgba(255,255,255,.1);border-radius:16px;text-align:center;transition:all .3s ease}.feature-card:hover{transform:translateY(-4px);background:#ffffff14;border-color:#4f46e54d}.feature-icon{font-size:3rem;margin-bottom:20px;display:block}.feature-title{font-size:1.25rem;font-weight:600;margin:0 0 12px;color:#fff}.feature-description{font-size:.95rem;color:#a1a1aa;line-height:1.6;margin:0}.error-message{display:none;padding:12px 16px;margin-top:12px;background:#dc2626;color:#fff;border-radius:8px;font-size:.9rem}@media (max-width: 768px){.homepage-title{font-size:2.5rem}.homepage-subtitle{font-size:1.1rem}.input-wrapper{flex-direction:column}.submit-button{justify-content:center}.features-title{font-size:2rem}.features-grid{grid-template-columns:1fr;gap:20px}.homepage-header{padding:60px 0 40px}}@media (max-width: 480px){.homepage-container{padding:0 16px}.homepage-title{font-size:2rem}.url-input,.submit-button{padding:14px 16px}}