:root{--primary:#fb7299;--secondary:#00a1d6;--success:#52c41a;--warning:#faad14;--error:#ff4d4f;--light:#f8f9fa;--dark:#212529;--gray:#6c757d;--bili-gradient:linear-gradient(135deg, #fb7299 0%, #00a1d6 100%);--card-shadow:0 8px 32px #0000001a;--hover-shadow:0 12px 40px #00000026}*{box-sizing:border-box;margin:0;padding:0}body{color:#212529;-webkit-overflow-scrolling:touch;background:#f5f5f7;justify-content:center;align-items:center;min-height:100vh;padding:20px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;display:flex}.floating-controls{z-index:200;align-items:center;gap:12px;display:flex;position:fixed;top:20px;right:20px}.floating-controls .theme-switcher{width:50px;height:50px;position:relative;top:auto;right:auto}*{will-change:auto}html{scroll-behavior:smooth;overflow-x:hidden}.btn-primary,.btn-outline,.theme-switcher,.help-button,.history-button{backface-visibility:hidden;transform:translateZ(0)}.main-container{will-change:auto;text-align:center;background:#fff;border:1px solid #fb72991a;border-radius:24px;width:100%;max-width:600px;padding:40px;position:relative;overflow:hidden;box-shadow:0 4px 24px #0000000f}.main-container:before{content:"";background:var(--bili-gradient);height:4px;position:absolute;top:0;left:0;right:0;transform:translateZ(0)}.app-header{justify-content:space-between;align-items:center;margin-bottom:30px;display:flex}.header-actions{align-items:center;gap:12px;margin-left:auto;display:inline-flex}.logo-container{align-items:center;gap:12px;display:flex}.app-icon{color:var(--primary);font-size:28px;animation:2s ease-in-out infinite 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#00a1d626}.aggregate-options textarea.input-error{border-color:var(--error);box-shadow:0 0 0 3px #ff4d4f33}.aggregate-hint{color:var(--gray);margin-top:8px;font-size:13px;line-height:1.6}.aggregate-toggle{cursor:pointer;-webkit-user-select:none;user-select:none;align-items:center;gap:8px;display:inline-flex}.aggregate-toggle input{display:none}.aggregate-toggle-slider{background:#00a1d64d;border-radius:999px;width:40px;height:22px;transition:background .2s;position:relative}.aggregate-toggle-slider:after{content:"";background:#fff;border-radius:50%;width:18px;height:18px;transition:transform .2s;position:absolute;top:2px;left:2px;box-shadow:0 2px 6px #0003}.aggregate-toggle input:checked+.aggregate-toggle-slider{background:var(--secondary)}.aggregate-toggle input:checked+.aggregate-toggle-slider:after{transform:translate(18px)}.aggregate-toggle-text{color:var(--gray);font-size:13px}.aggregate-options.active .aggregate-toggle-text{color:var(--secondary)}.aggregate-feedback{color:var(--gray);margin-top:6px;font-size:13px;line-height:1.4}.aggregate-feedback.success{color:var(--success)}.aggregate-feedback.error{color:var(--error)}.aggregate-feedback.muted{color:var(--gray);font-style:italic}.input-group:before{content:"🔍";color:#ccc;z-index:1;font-size:16px;position:absolute;top:12px;left:20px}.input-group:after{content:"🎬";color:#00a1d64d;font-size:18px;position:absolute;top:100%;right:30px;transform:translateY(-50%)}@media (width<=768px){.input-group:before,.input-group:after{display:none}}.form-control{max-width:420px;transition:border-color .2s;color:#333!important;box-sizing:border-box!important;background:#fff!important;border:1px solid #ddd!important;border-radius:8px!important;flex-grow:1!important;width:100%!important;min-width:180px!important;padding:.8rem 2.4rem!important;font-size:1rem!important;display:block!important}@media (width<=768px){.form-control{padding:.8rem!important}}.form-control:focus{background:#fff!important;border-color:#00a1d6!important;outline:none!important}.btn-primary{flex-shrink:0;justify-content:center;align-items:center;gap:8px;min-width:140px;transition:background-color .2s;color:#fff!important;cursor:pointer!important;background-color:#00a1d6!important;border:none!important;border-radius:999px!important;justify-content:center!important;align-items:center!important;padding:1rem 2rem!important;font-size:1.08rem!important;display:inline-flex!important}.btn-primary:hover{color:#fff!important;background-color:#00b5e5!important;text-decoration:none!important}.btn-primary:disabled{opacity:.6;cursor:not-allowed;box-shadow:none!important;transform:none!important}.btn-outline{background:var(--bili-gradient);color:#fff;cursor:pointer;white-space:nowrap;border:none;justify-content:center;align-items:center;gap:8px;min-width:140px;margin-left:10px;padding:1rem 2rem;font-size:1.08rem;font-weight:500;transition:all .3s;display:inline-flex;box-shadow:0 4px 15px #fb72994d;border-radius:999px!important}.btn-outline:hover{color:#fff;background:linear-gradient(135deg,#fa5385 0%,#0bb6eb 100%);box-shadow:0 6px 18px #fb729966}.btn-outline:active{opacity:.9}.input-section .input-group{flex-wrap:wrap;justify-content:center;gap:10px;display:flex}.input-section{position:relative}.input-section:before{content:"📅";opacity:.5;font-size:20px;position:absolute;bottom:10px;left:20px}.input-section:after{content:"✨";opacity:.5;font-size:20px;position:absolute;bottom:10px;right:20px}@media (width<=768px){.input-section:before,.input-section:after{display:none}}.input-section .btn-primary,.input-section .btn-outline{flex:none}@media (width<=768px){.input-section .input-group{flex-direction:column}.input-section .btn-primary,.input-section .btn-outline{width:100%;margin-left:0!important}}.help-text{color:var(--gray);text-align:center;background:#fb729914;border:1.5px solid #fb7299;border-radius:16px;max-width:420px;margin:28px auto 0;padding:18px 28px;font-size:15px;position:relative;box-shadow:0 2px 12px #fb729914}.help-text:before{content:"ℹ️";background:#fff;border:1px solid #fb729933;border-radius:50%;padding:2px 8px;font-size:14px;position:absolute;top:-10px;left:20px}@media (width<=480px){.help-text:before{padding:1px 5px;font-size:12px;top:-8px;left:10px}}.help-text strong{color:var(--primary)}.spinner{border:3px solid #fb729933;border-top-color:var(--primary);vertical-align:middle;border-radius:50%;width:20px;height:20px;margin-right:12px;animation:1s ease-in-out infinite spin;display:inline-block}.result-box{text-align:center;background:linear-gradient(135deg,#52c41a1a,#52c41a0d);border:1px solid #52c41a4d;border-radius:16px;max-width:520px;margin:48px auto 0;padding:24px;animation:.5s slideIn;display:block;box-shadow:0 4px 20px #52c41a1a}.result-box h3{color:var(--success);align-items:center;gap:8px;margin-top:0;margin-bottom:16px;font-size:20px;font-weight:600;display:flex}.result-box p{color:var(--dark);margin:12px 0;line-height:1.6}.subscribe-url{color:var(--dark);word-break:break-all;background:#fffc;border:1px solid #fb729933;border-radius:8px;margin:12px 0;padding:12px 16px;font-family:Courier New,monospace;font-size:14px}.btn-group{flex-wrap:wrap;gap:12px;margin-top:16px;display:flex}.btn{cursor:pointer;border:none;border-radius:8px;justify-content:center;align-items:center;gap:6px;min-width:120px;padding:12px 20px;font-size:14px;font-weight:500;text-decoration:none;transition:all .3s;display:flex}.btn-success{background:linear-gradient(135deg, var(--success), #73d13d);color:#fff;box-shadow:0 4px 12px #52c41a4d}.btn-success:hover{color:#fff;text-decoration:none;transform:translateY(-1px);box-shadow:0 6px 16px #52c41a66}.btn-outline-primary{color:var(--primary);border:2px solid var(--primary);background:0 0}.btn-outline-primary:hover{background:var(--primary);color:#fff;text-decoration:none;transform:translateY(-1px)}.subscribe-wizard .wizard-steps{color:inherit;margin:.5rem 0 .75rem 1.25rem;padding:0;line-height:1.6}.subscribe-wizard .wizard-note{opacity:.85;margin:0 0 1rem;font-size:.9rem}.instructions{border-left:4px solid var(--secondary);text-align:left;background:linear-gradient(135deg,#00a1d61a,#00a1d60d);border-radius:0 8px 8px 0;margin-top:20px;padding:20px}.instructions h4{color:var(--secondary);align-items:center;gap:8px;margin-bottom:12px;font-size:16px;font-weight:600;display:flex}.instructions ul{margin:0;padding-left:20px}.instructions li{color:var(--dark);margin-bottom:8px;line-height:1.5}.info-section{text-align:left;background:#fff;border:1px solid #fb729933;border-radius:16px;margin-top:30px;padding:24px;box-shadow:0 2px 12px #0000000a}.info-section h3{color:var(--primary);align-items:center;gap:8px;margin-bottom:16px;font-size:18px;font-weight:600;display:flex}.info-section ul{margin-bottom:16px;padding:0;list-style:none}.info-section li{color:var(--dark);padding:8px 0 8px 24px;line-height:1.5;position:relative}.info-section li:before{content:"✓";color:var(--primary);font-size:16px;font-weight:700;position:absolute;left:0}.privacy-warning{border-left:4px solid var(--error);color:var(--error);text-align:center;background:linear-gradient(135deg,#ff4d4f1a,#ff4d4f0d);border-radius:0 8px 8px 0;margin-top:16px;padding:16px;font-size:14px;font-weight:600;box-shadow:0 2px 8px #ff4d4f1a}.faq-list details{border-bottom:1px solid #0000000f;padding:12px 0}.faq-list details:last-child{border-bottom:none}.faq-list summary{cursor:pointer;color:var(--dark);-webkit-user-select:none;user-select:none;align-items:center;gap:8px;padding:8px 0;font-weight:600;list-style:none;display:flex}.faq-list summary:before{content:"▸";color:var(--primary);font-size:14px;transition:transform .2s}.faq-list details[open] summary:before{transform:rotate(90deg)}.faq-list summary::-webkit-details-marker{display:none}.faq-list details p{color:#666;margin:0;padding:8px 0 0 20px;font-size:14px;line-height:1.6}.github-btn{color:#fff;cursor:pointer;z-index:10;background:#24292e;border:1px solid #ffffff2e;border-radius:999px;justify-content:center;align-items:center;gap:8px;padding:10px 18px;font-size:16px;text-decoration:none;transition:all .3s;display:inline-flex;box-shadow:0 4px 12px #00000014}.github-btn:hover{color:#fff;background:#111;text-decoration:none;transform:translateY(-1px);box-shadow:0 6px 16px #0000001f}.language-btn{background:var(--bili-gradient);color:#fff;cursor:pointer;border:none;border-radius:999px;justify-content:center;align-items:center;gap:8px;min-width:120px;padding:10px 18px;font-size:16px;font-weight:600;transition:all .3s;display:inline-flex;box-shadow:0 4px 12px #00a1d640}.language-btn:hover{background:linear-gradient(135deg,#0092c2,#49c2ff);transform:translateY(-1px);box-shadow:0 6px 16px #00a1d659}@media (width<=768px){.app-header{flex-direction:column;align-items:flex-start;gap:16px}.header-actions{justify-content:flex-start;gap:10px;width:100%}.github-btn{padding:8px 14px;font-size:14px}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes slideIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translate(0,0)}}@media (prefers-reduced-motion:reduce){*{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}@media (width<=768px){body{padding:10px}.main-container{margin:10px;padding:30px 20px}.app-title{font-size:20px}.page-title h1{font-size:26px}.input-group{flex-direction:column;gap:8px}.btn-group{flex-direction:column}.btn{width:100%}.form-control{flex:none;max-width:none;min-height:50px;font-size:16px;box-sizing:border-box!important;width:100%!important;padding:.8rem!important;display:block!important}.input-section{padding:20px}.btn-primary{min-height:50px;padding:.8rem 1.5rem!important;font-size:1rem!important}}@media (width<=480px){.main-container{padding:20px 15px}.app-header{flex-direction:column;gap:15px}.page-title h1{font-size:22px}.form-control{flex:none;max-width:none;min-height:48px;font-size:16px;width:100%!important;padding:.8rem!important;display:block!important}.input-section{padding:15px}.btn-primary{min-height:48px;padding:.8rem 1.5rem!important;font-size:1rem!important}}@media (width<=360px){body{padding:5px}.main-container{margin:5px;padding:15px 10px}.form-control{flex:none;max-width:none;min-height:44px;font-size:16px;width:100%!important;padding:.8rem!important;display:block!important}.btn-primary{min-height:44px;padding:.8rem 1.5rem!important;font-size:1rem!important}.page-title h1{font-size:20px}.input-section{padding:10px}.page-title p{font-size:14px}}.toast-notification{color:#fff;opacity:0;z-index:1000;background:#000c;border-radius:50px;align-items:center;padding:15px 25px;font-size:16px;transition:opacity .3s;display:flex;position:fixed;bottom:30px;left:50%;transform:translate(-50%);box-shadow:0 5px 15px #0000004d}.toast-notification.show{opacity:1}.toast-content{align-items:center;gap:8px;display:flex}.toast-content i{color:var(--success);font-size:18px}@media (width>=769px){.form-control{color:var(--dark);background:#ffffffe6;border:2px solid #fb729933;border-radius:12px;flex-grow:1;width:100%;min-width:180px;padding:16px 20px;font-size:16px;transition:all .3s;display:block;box-shadow:0 2px 8px #0000000d}.form-control:focus{border-color:var(--primary);background:#fff;outline:none;box-shadow:0 0 0 4px #fb72991a}.btn-primary{background:var(--bili-gradient);color:#fff;cursor:pointer;border:none;border-radius:12px;justify-content:center;align-items:center;gap:8px;min-width:140px;padding:16px 24px;font-size:16px;font-weight:600;transition:all .3s;display:flex;box-shadow:0 4px 15px #fb72994d}.btn-primary:hover{color:#fff;background:linear-gradient(135deg,#fb7299 0%,#00a1d6 100%)}}@media (width<=768px){.form-control{width:100%!important;min-width:0!important;box-shadow:none!important;background:#fff!important;border:1px solid #ddd!important;border-radius:8px!important;padding:.8rem!important;font-size:16px!important}.btn-primary{min-width:0!important;box-shadow:none!important;background:var(--bili-gradient)!important;border-radius:999px!important;padding:.8rem 1.5rem!important;font-size:1rem!important}.btn-outline{min-width:0!important;box-shadow:none!important;border-radius:999px!important;padding:.8rem 1.5rem!important;font-size:1rem!important}}.app-footer{color:var(--gray);text-align:center;border-top:1px solid #0000000f;margin-top:28px;padding-top:16px;font-size:12px}[data-theme=dark]{--primary:#f69;--secondary:#00d4ff;--success:#67c23a;--warning:#e6a23c;--error:#f56c6c;--light:#1a1a1a;--dark:#f0f0f0;--gray:#9e9e9e;--bili-gradient:linear-gradient(135deg, #f69c 0%, #00d4ffcc 100%);--card-shadow:0 8px 32px #0006;--hover-shadow:0 12px 40px #0009;--bg-primary:#0a0a0a;--bg-secondary:#1a1a1a;--bg-card:#1e1e1ef2;--bg-input:#282828e6;--bg-hover:#3c3c3c4d;--text-primary:#f0f0f0;--text-secondary:#b0b0b0;--text-muted:gray;--border-primary:#ff66994d;--border-secondary:#00d4ff4d;--border-default:#ffffff1a}[data-theme=dark] body{color:var(--text-primary);background:linear-gradient(135deg,#0a0a0a 0%,#1a1a1a 100%)}[data-theme=dark] .main-container{background:var(--bg-card);border-color:var(--border-primary)}[data-theme=dark] .main-container:before{opacity:.8}[data-theme=dark] .page-title h1{color:var(--text-primary)}[data-theme=dark] .page-title p{color:var(--text-secondary)}[data-theme=dark] .input-section{background:var(--bg-secondary);border-color:var(--border-primary)}[data-theme=dark] .form-control{background:var(--bg-input)!important;color:var(--text-primary)!important;border-color:var(--border-default)!important}[data-theme=dark] .form-control:focus{border-color:var(--primary)!important;background:#3c3c3ce6!important;box-shadow:0 0 0 4px #f693!important}[data-theme=dark] .help-text{border-color:var(--primary);color:var(--text-secondary);background:#ff669926}[data-theme=dark] .aggregate-options{background:#00d4ff14;border-color:#00d4ff80}[data-theme=dark] .aggregate-options textarea{background:var(--bg-input);color:var(--text-primary);border-color:var(--border-default)}[data-theme=dark] .beta-badge{color:var(--secondary);background:#00d4ff26;border-color:#00d4ff80}[data-theme=dark] .aggregate-hint,[data-theme=dark] .aggregate-toggle-text{color:var(--text-secondary)}[data-theme=dark] .aggregate-options.active .aggregate-toggle-text{color:var(--secondary)}[data-theme=dark] .aggregate-toggle-slider{background:#fff3}[data-theme=dark] .help-text strong{color:var(--primary)}[data-theme=dark] .loading{background:var(--bg-secondary);border-color:var(--border-primary);color:var(--text-primary)}[data-theme=dark] .result-box{background:linear-gradient(135deg,#67c23a26,#67c23a14);border-color:#67c23a66}[data-theme=dark] .result-box h3{color:var(--success)}[data-theme=dark] .result-box p{color:var(--text-primary)}[data-theme=dark] .subscribe-url{background:var(--bg-input);border-color:var(--border-primary);color:var(--text-primary)}[data-theme=dark] .instructions{border-color:var(--secondary);background:linear-gradient(135deg,#00d4ff26,#00d4ff14)}[data-theme=dark] .instructions h4{color:var(--secondary)}[data-theme=dark] .instructions li{color:var(--text-primary)}[data-theme=dark] .info-section{background:var(--bg-secondary);border-color:var(--border-primary)}[data-theme=dark] .info-section h3{color:var(--primary)}[data-theme=dark] .info-section li{color:var(--text-primary)}[data-theme=dark] .privacy-warning{border-color:var(--error);color:var(--error);background:linear-gradient(135deg,#f56c6c26,#f56c6c14)}[data-theme=dark] .faq-list details{border-bottom-color:#ffffff0f}[data-theme=dark] .faq-list summary{color:var(--text-primary)}[data-theme=dark] .faq-list details p{color:var(--text-secondary)}[data-theme=dark] .project-info{border-color:var(--secondary);background:linear-gradient(135deg,#00d4ff26,#00d4ff14)}[data-theme=dark] .project-info h3{color:var(--secondary)}[data-theme=dark] .project-info p{color:var(--text-primary)}[data-theme=dark] .project-link{color:var(--secondary)}[data-theme=dark] .project-link:hover{color:var(--primary)}[data-theme=dark] 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