:root{--primary: #FF0000;--primary-hover: #E10000;--primary-light: #FFECEC;--primary-glow: rgba(255, 0, 0, .15);--bg-app: #F9F9FB;--bg-card: #FFFFFF;--bg-input: #F8F8FA;--bg-input-focus: #FFFFFF;--text-main: #0F0F0F;--text-body: #212121;--text-muted: #606060;--text-light: #909090;--border-color: #EFEFEF;--border-hover: #D5D5D5;--success: #10B981;--success-light: #ECFDF5;--success-border: #A7F3D0;--error: #EF4444;--error-light: #FEF2F2;--error-border: #FCA5A5;--font-family-title: "Outfit", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-family-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--radius-lg: 16px;--radius-md: 12px;--radius-sm: 8px;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .04);--shadow-md: 0 10px 30px rgba(0, 0, 0, .06);--shadow-lg: 0 20px 45px rgba(0, 0, 0, .09);--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-normal: .3s cubic-bezier(.4, 0, .2, 1);--transition-slow: .5s cubic-bezier(.4, 0, .2, 1)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}body{font-family:var(--font-family-body);font-size:15px;line-height:1.6;color:var(--text-body);background-color:var(--bg-app);display:flex;justify-content:center;align-items:center;min-height:100vh;padding:40px 20px}.app-container{width:100%;max-width:680px;display:flex;flex-direction:column;gap:24px}.app-header{text-align:center;margin-bottom:8px}.logo-wrapper{display:inline-flex;align-items:center;gap:10px;margin-bottom:16px}.logo-icon{width:38px;height:38px;stroke:var(--primary);stroke-width:2.2;transition:transform var(--transition-normal)}.logo-wrapper:hover .logo-icon{transform:rotate(-15deg) scale(1.1)}.logo-text{font-family:var(--font-family-title);font-size:26px;font-weight:800;color:var(--text-main);letter-spacing:-.5px}.logo-text span{color:var(--primary)}.app-header h1{font-family:var(--font-family-title);font-size:32px;font-weight:700;color:var(--text-main);margin-bottom:8px;letter-spacing:-.5px}.subtitle{font-size:15px;color:var(--text-muted);max-width:480px;margin:0 auto}.card{background-color:var(--bg-card);border-radius:var(--radius-lg);border:1px solid var(--border-color);box-shadow:var(--shadow-md);padding:30px;transition:box-shadow var(--transition-normal),transform var(--transition-normal);position:relative;overflow:hidden}.card:hover{box-shadow:var(--shadow-lg)}.card-divider{border:none;border-top:1px solid var(--border-color);margin:24px 0}.btn{font-family:var(--font-family-title);font-size:15px;font-weight:600;padding:14px 24px;border-radius:var(--radius-md);border:none;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:8px;transition:background-color var(--transition-fast),transform var(--transition-fast),box-shadow var(--transition-fast);outline:none}.btn-primary{background-color:var(--primary);color:#fff}.btn-primary:hover{background-color:var(--primary-hover);box-shadow:0 4px 15px var(--primary-glow);transform:translateY(-1px)}.btn-primary:active{transform:translateY(0)}.btn-secondary{background-color:var(--bg-app);color:var(--text-body);border:1px solid var(--border-color)}.btn-secondary:hover{background-color:#f1f1f3;border-color:var(--border-hover)}.btn-large{padding:16px 32px;font-size:17px}.btn-block{display:flex;width:100%}.btn-icon{width:18px;height:18px;stroke-width:2.5;transition:transform var(--transition-fast)}.btn-primary:hover .btn-icon{transform:translate(3px)}.btn-icon-left{width:20px;height:20px;stroke-width:2.2}.input-card{padding:24px}.input-group{display:flex;gap:12px;align-items:center}.input-wrapper{position:relative;flex-grow:1;display:flex;align-items:center}.input-icon{position:absolute;left:16px;width:20px;height:20px;color:var(--text-light);pointer-events:none;transition:color var(--transition-fast)}#youtube-url{width:100%;padding:16px 44px 16px 48px;font-family:var(--font-family-body);font-size:15px;color:var(--text-main);background-color:var(--bg-input);border:1.5px solid transparent;border-radius:var(--radius-md);outline:none;transition:background-color var(--transition-fast),border-color var(--transition-fast),box-shadow var(--transition-fast)}#youtube-url:focus{background-color:var(--bg-input-focus);border-color:var(--primary);box-shadow:0 0 0 4px var(--primary-glow)}#youtube-url:focus~.input-icon{color:var(--primary)}.clear-btn{position:absolute;right:14px;background:none;border:none;color:var(--text-light);cursor:pointer;padding:4px;border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity var(--transition-fast),background-color var(--transition-fast)}.clear-btn:hover{background-color:#0000000d;color:var(--text-main)}.clear-btn svg{width:16px;height:16px}.clear-btn.visible{opacity:1;pointer-events:auto}.error-card{border-color:var(--error-border);background-color:var(--error-light);padding:20px;display:flex;align-items:center;justify-content:space-between;gap:16px}.error-content{display:flex;align-items:flex-start;gap:14px}.error-icon-wrapper{background-color:var(--error);color:#fff;padding:8px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;box-shadow:0 3px 10px #ef444433}.error-icon{width:20px;height:20px;stroke:currentColor}.error-text h3{font-family:var(--font-family-title);font-size:16px;font-weight:600;color:#991b1b;margin-bottom:2px}.error-text p{font-size:14px;color:#b91c1c}.error-close-btn{background:none;border:none;color:#b91c1c;cursor:pointer;align-self:flex-start;padding:4px;border-radius:50%;display:flex;transition:background-color var(--transition-fast)}.error-close-btn:hover{background-color:#ef44441a}.error-close-btn svg{width:18px;height:18px}.loading-card{padding:30px;display:flex;flex-direction:column;gap:24px}.loading-status{display:flex;align-items:center;gap:14px}.spinner{width:24px;height:24px;border:3px solid rgba(255,0,0,.1);border-top:3px solid var(--primary);border-radius:50%;animation:spin .8s linear infinite;flex-shrink:0}.loading-text{font-family:var(--font-family-title);font-size:16px;font-weight:600;color:var(--text-main)}.skeleton-layout{display:flex;gap:20px}.skeleton-thumbnail{width:180px;height:110px;border-radius:var(--radius-md);background-color:#efefef;flex-shrink:0}.skeleton-info{flex-grow:1;display:flex;flex-direction:column;gap:12px;justify-content:center}.skeleton-line{height:14px;background-color:#efefef;border-radius:4px}.skeleton-title{width:85%;height:18px}.skeleton-channel{width:45%;height:14px;margin-bottom:4px}.skeleton-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.skeleton-grid .skeleton-line{width:90%;height:12px}.skeleton-pulse{background:linear-gradient(90deg,#ecebeb 25%,#f4f3f3,#ecebeb 75%);background-size:200% 100%;animation:loading-pulse 1.5s infinite}.video-details-layout{display:flex;gap:24px}.thumbnail-wrapper{position:relative;width:200px;height:120px;border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-sm);background-color:#000;flex-shrink:0}.video-thumbnail{width:100%;height:100%;object-fit:cover;opacity:0;transition:opacity var(--transition-normal)}.video-thumbnail.loaded{opacity:1}.video-duration{position:absolute;bottom:8px;right:8px;background-color:#0f0f0fd9;color:#fff;font-size:11px;font-weight:600;padding:2px 6px;border-radius:4px}.metadata-content{flex-grow:1;display:flex;flex-direction:column;justify-content:space-between}.video-title{font-family:var(--font-family-title);font-size:18px;font-weight:700;line-height:1.4;color:var(--text-main);margin-bottom:4px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.video-channel-name{font-size:14px;font-weight:500;color:var(--text-muted);margin-bottom:12px}.metadata-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.meta-item{display:flex;flex-direction:column}.meta-label{font-size:11px;text-transform:uppercase;letter-spacing:.5px;color:var(--text-light);margin-bottom:2px}.meta-value{font-size:13px;font-weight:600;color:var(--text-body)}.quality-selection-section h3{font-family:var(--font-family-title);font-size:16px;font-weight:700;color:var(--text-main);margin-bottom:16px}.quality-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.format-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.format-selection-section h3{font-family:var(--font-family-title);font-size:16px;font-weight:700;color:var(--text-main);margin-bottom:16px}.quality-card input[type=radio]{position:absolute;opacity:0;width:0;height:0}.quality-card{border:1.5px solid var(--border-color);border-radius:var(--radius-md);padding:16px 14px;cursor:pointer;display:flex;flex-direction:column;position:relative;transition:border-color var(--transition-fast),background-color var(--transition-fast),transform var(--transition-fast),box-shadow var(--transition-fast);background-color:var(--bg-card)}.quality-card:hover{border-color:var(--border-hover);transform:translateY(-2px);box-shadow:var(--shadow-sm)}.quality-card-content{display:flex;flex-direction:column;gap:4px}.bitrate{font-family:var(--font-family-title);font-size:18px;font-weight:700;color:var(--text-main)}.quality-label{font-size:12px;color:var(--text-muted)}.quality-size-est{font-size:11px;font-weight:500;color:var(--text-light);margin-top:2px}.selection-indicator{position:absolute;top:12px;right:12px;width:18px;height:18px;border-radius:50%;border:2px solid var(--border-color);display:flex;align-items:center;justify-content:center;transition:border-color var(--transition-fast),background-color var(--transition-fast)}.selection-indicator:after{content:"";width:8px;height:8px;border-radius:50%;background-color:#fff;opacity:0;transform:scale(.5);transition:opacity var(--transition-fast),transform var(--transition-fast)}.quality-card input[type=radio]:checked~.quality-card-content .bitrate{color:var(--primary)}.quality-card input[type=radio]:checked~.quality-card-content .quality-size-est{color:var(--primary-hover)}.quality-card input[type=radio]:checked+.quality-card-content+.selection-indicator,.quality-card input[type=radio]:checked~.selection-indicator{border-color:var(--primary);background-color:var(--primary)}.quality-card input[type=radio]:checked~.selection-indicator:after{opacity:1;transform:scale(1)}.quality-card:has(input[type=radio]:checked){border-color:var(--primary);background-color:var(--primary-light)}.action-btn-wrapper{margin-top:24px}.download-bar{display:flex;gap:10px;align-items:stretch;margin-top:8px;position:relative}.btn-download{flex:1 1 auto;min-width:0;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 18px;font-size:15px;font-weight:700;border-radius:var(--radius-md)}.btn-download .btn-icon-left{width:18px;height:18px}.format-dropdown{position:relative;flex:0 0 148px;min-width:132px}.format-dropdown-toggle{width:100%;height:100%;display:flex;align-items:center;justify-content:space-between;gap:8px;padding:10px 12px;background:var(--bg-input);border:1.5px solid var(--border-color);border-radius:var(--radius-md);cursor:pointer;color:var(--text-main);transition:border-color var(--transition-fast),background-color var(--transition-fast)}.format-dropdown-toggle:hover,.format-dropdown.open .format-dropdown-toggle{border-color:var(--primary);background:var(--bg-card)}.format-dropdown-value{display:flex;flex-direction:column;align-items:flex-start;gap:1px;min-width:0;text-align:left}.fd-format{font-family:var(--font-family-title);font-size:14px;font-weight:700;color:var(--primary);line-height:1.2}.fd-meta{font-size:11px;font-weight:500;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:90px}.fd-size{font-size:11px;font-weight:600;color:var(--text-main);white-space:nowrap}.fd-chevron{width:16px;height:16px;flex-shrink:0;color:var(--text-muted);transition:transform var(--transition-fast)}.format-dropdown.open .fd-chevron{transform:rotate(180deg)}.format-dropdown-menu{position:absolute;right:0;bottom:calc(100% + 8px);width:min(300px,calc(100vw - 48px));max-height:min(320px,50vh);overflow-y:auto;background:var(--bg-card);border:1.5px solid var(--primary);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);z-index:40;padding:6px 0}.format-dropdown-group{padding:4px 0}.format-dropdown-group+.format-dropdown-group{border-top:1px solid var(--border-color);margin-top:2px;padding-top:6px}.format-dropdown-group-label{font-family:var(--font-family-title);font-size:10px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--text-light);padding:4px 14px 6px}.format-dropdown-option{width:100%;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:9px 14px;border:none;background:transparent;cursor:pointer;color:var(--text-body);font-family:inherit;text-align:left;transition:background-color var(--transition-fast)}.format-dropdown-option:hover,.format-dropdown-option.active{background:var(--primary-light)}.format-dropdown-option .opt-left{display:inline-flex;align-items:center;gap:8px;min-width:0}.format-dropdown-option .opt-format{font-family:var(--font-family-title);font-size:13px;font-weight:700;color:var(--primary)}.format-dropdown-option .opt-right{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:600;color:var(--text-muted);white-space:nowrap}.format-dropdown-option .opt-size{font-weight:500;color:var(--text-light);font-size:11px}.format-dropdown-option .mute-icon{width:14px;height:14px;color:#ef4444;flex-shrink:0}@media (max-width: 520px){.download-bar{flex-direction:column}.format-dropdown{flex:1 1 auto;width:100%;min-width:0}.format-dropdown-menu{left:0;right:0;width:100%;bottom:calc(100% + 8px)}.fd-meta{max-width:none}}.progress-card 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h2{font-family:var(--font-family-title);font-size:24px;font-weight:700;color:var(--text-main);margin-bottom:8px}.success-description{font-size:14px;color:var(--text-muted);margin-bottom:24px}.success-file-summary{background-color:var(--success-light);border:1px solid var(--success-border);border-radius:var(--radius-md);padding:16px;margin-bottom:28px;text-align:left}.summary-title{font-family:var(--font-family-title);font-size:15px;font-weight:600;color:#065f46;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-bottom:4px}.summary-details{font-size:13px;color:#047857;display:flex;align-items:center;gap:8px}.bullet{color:#34d399}.success-buttons{display:flex;flex-direction:column;gap:12px}.app-footer{text-align:center;margin-top:12px;display:flex;flex-direction:column;gap:8px}.footer-links{display:flex;justify-content:center;align-items:center;gap:12px}.footer-links a{color:var(--text-muted);text-decoration:none;font-size:13px;font-weight:500;transition:color var(--transition-fast)}.footer-links a:hover{color:var(--primary);text-decoration:underline}.footer-divider{color:var(--text-light);font-size:10px}.copyright{font-size:12px;color:var(--text-light)}.modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background-color:#0f0f0f73;backdrop-filter:blur(4px);display:flex;justify-content:center;align-items:center;z-index:1000;opacity:0;pointer-events:none;transition:opacity var(--transition-normal)}.modal-overlay:not(.hidden){opacity:1;pointer-events:auto}.modal-card{background-color:var(--bg-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);width:90%;max-width:500px;padding:32px;position:relative;transform:translateY(20px) scale(.95);transition:transform var(--transition-normal)}.modal-overlay:not(.hidden) .modal-card{transform:translateY(0) scale(1)}.modal-close{position:absolute;top:20px;right:20px;background:none;border:none;font-size:26px;line-height:1;color:var(--text-light);cursor:pointer;transition:color var(--transition-fast)}.modal-close:hover{color:var(--text-main)}.modal-card h2{font-family:var(--font-family-title);font-size:22px;font-weight:700;color:var(--text-main);margin-bottom:16px}.modal-body-content{max-height:350px;overflow-y:auto;font-size:14px;color:var(--text-body);line-height:1.5}.modal-body-content h4{font-family:var(--font-family-title);font-size:15px;font-weight:600;margin:16px 0 6px;color:var(--text-main)}.hidden{display:none!important}.animate-fade-in{animation:fadeIn .4s ease-out forwards}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes loading-pulse{0%{background-position:200% 0}to{background-position:-200% 0}}@keyframes stroke-circle{to{stroke-dashoffset:0}}@keyframes stroke-check{to{stroke-dashoffset:0}}@media (max-width: 768px){body{padding:24px 16px}.app-container{gap:20px}.app-header h1{font-size:28px}.card{padding:24px}.video-details-layout{gap:20px}.thumbnail-wrapper{width:160px;height:96px}}@media (max-width: 576px){.input-group{flex-direction:column;width:100%;align-items:stretch}#get-video-btn{width:100%}.video-details-layout{flex-direction:column;align-items:center;text-align:center;gap:16px}.thumbnail-wrapper{width:100%;max-width:280px;height:160px}.metadata-content{width:100%}.video-title{font-size:16px}.metadata-grid{gap:8px;margin-top:12px}.quality-grid{grid-template-columns:1fr;gap:10px}.format-grid{grid-template-columns:repeat(2,1fr);gap:10px}.quality-card{flex-direction:row;align-items:center;justify-content:space-between;padding:14px 16px}.quality-card-content{flex-direction:row;align-items:baseline;gap:8px}.quality-size-est{margin-top:0}.selection-indicator{position:static}.skeleton-layout{flex-direction:column;gap:16px}.skeleton-thumbnail{width:100%;height:140px}.progress-stats-grid{grid-template-columns:1fr;gap:8px}}body{transition:background-color .3s ease,color .3s ease,border-color .3s ease}.card{transition:background-color .3s ease,border-color .3s ease,box-shadow .3s ease,transform .3s ease}html.dark-theme{color-scheme:dark;background-color:#0f0f0f;--bg-app: #0F0F0F;--bg-card: #1F1F1F;--bg-input: #121212;--bg-input-focus: #1A1A1A;--text-main: #F1F1F1;--text-body: #AAAAAA;--text-muted: #888888;--text-light: #5F5F5F;--border-color: #2D2D2D;--border-hover: #3F3F3F;--primary-light: #2A0E0E;--success-light: #0D2A1C;--success-border: #134E35;--error-light: #2D1010;--error-border: #4A1515}.header-top-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;width:100%}.mode-nav{display:inline-flex;align-items:center;gap:4px;padding:4px;margin:0 auto 18px;background:var(--bg-input);border:1px solid var(--border-color);border-radius:999px}.mode-nav-link{font-family:var(--font-family-title);font-size:13px;font-weight:600;color:var(--text-muted);text-decoration:none;padding:8px 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