:root{--bg: #F4F5F7;--bg-card: rgba(255,255,255,.72);--bg-card-solid: #fff;--border-card: rgba(255,255,255,.55);--border-subtle: rgba(0,0,0,.06);--accent: #5872E5;--accent-light: #EEF1FC;--accent-dark: #4058C9;--accent-gradient: linear-gradient(135deg, #5872E5, #7B8FF2);--accent-rgb: 88, 114, 229;--accent-highlight: #7B8FF2;--free: #2EAE7B;--free-light: #EAFAF3;--free-gradient: linear-gradient(135deg, #2EAE7B, #45C896);--mp3-accent: #5872E5;--mp3-accent-light: #EEF1FC;--mp3-gradient: linear-gradient(135deg, #5872E5, #7B8FF2);--mp3-accent-rgb: 88, 114, 229;--mp4-accent: #0EA5E9;--mp4-accent-light: #E0F2FE;--mp4-gradient: linear-gradient(135deg, #0EA5E9, #38BDF8);--mp4-accent-rgb: 14, 165, 233;--text-primary: #1E293B;--text-secondary: #64748B;--text-tertiary: #94A3B8;--text-muted: #B0BEC5;--danger: #E5534B;--danger-light: #FEF1F0;--shadow-sm: 0 1px 3px rgba(0,0,0,.04);--shadow: 0 2px 8px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);--shadow-md: 0 4px 16px rgba(0,0,0,.08);--shadow-lg: 0 8px 32px rgba(0,0,0,.1);--radius: 16px;--radius-sm: 10px;--glass-blur: blur(24px)}.theme-mp4{--accent: #0EA5E9;--accent-light: #E0F2FE;--accent-dark: #0284C7;--accent-gradient: linear-gradient(135deg, #0EA5E9, #38BDF8);--accent-rgb: 14, 165, 233;--accent-highlight: #38BDF8}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:-apple-system,BlinkMacSystemFont,SF Pro Display,Hiragino Kaku Gothic ProN,Noto Sans JP,sans-serif;background:var(--bg);color:var(--text-primary);line-height:1.65;padding-bottom:100px;-webkit-font-smoothing:antialiased}.header{position:sticky;top:0;z-index:100;background:#f4f5f7c7;-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);border-bottom:1px solid var(--border-subtle);padding:0 16px}.header-inner{max-width:840px;margin:0 auto;display:flex;flex-direction:column;gap:4px;padding:6px 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rgba(var(--accent-rgb),.2);box-shadow:var(--shadow-sm)}.btn-buy:hover{background:var(--accent-light);border-color:rgba(var(--accent-rgb),.35)}.btn-primary{background:var(--accent-gradient);color:#fff;padding:12px 28px;font-size:15px;font-weight:700;border-radius:var(--radius-sm);box-shadow:0 2px 8px rgba(var(--accent-rgb),.25)}.btn-primary:hover{box-shadow:0 4px 16px rgba(var(--accent-rgb),.35);transform:translateY(-1px)}.btn-primary:active{transform:translateY(0) scale(.98)}.btn-primary:disabled{background:var(--text-muted);box-shadow:none;cursor:not-allowed;transform:none}.main{max-width:840px;margin:0 auto;padding:28px 16px}.hero-text{text-align:center;margin-bottom:32px;color:var(--text-secondary);font-size:14px;line-height:1.75}.hero-text strong{color:var(--text-primary);font-weight:700}.card{background:var(--bg-card);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);border-radius:var(--radius);border:1px solid var(--border-card);box-shadow:var(--shadow);padding:24px;margin-bottom:16px;transition:opacity .4s ease,filter .4s ease,transform .4s ease,border-color .3s ease}.card.disabled{opacity:.35;pointer-events:none;filter:grayscale(.2);transform:scale(.995)}.card-title{font-size:14px;font-weight:700;color:var(--text-primary);margin-bottom:16px;display:flex;align-items:center;gap:8px;letter-spacing:-.2px}.card-subtitle{font-size:12px;font-weight:500;color:var(--text-tertiary);margin-left:4px}.step-num{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;border-radius:7px;background:var(--accent-gradient);color:#fff;font-size:11px;font-weight:800;flex-shrink:0}.card.format-mp3{border-color:rgba(var(--mp3-accent-rgb),.18)}.card.format-mp4{border-color:rgba(var(--mp4-accent-rgb),.18)}.card.format-mp3 .step-num{background:var(--mp3-gradient)}.card.format-mp4 .step-num{background:var(--mp4-gradient)}.url-row{display:flex;gap:8px;margin-bottom:16px}.url-input{flex:1;padding:11px 14px;border:1.5px solid rgba(0,0,0,.08);border-radius:var(--radius-sm);font-size:14px;outline:none;background:#fff9;transition:all .2s ease}.url-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(var(--accent-rgb),.12);background:#fff}.url-input::placeholder{color:var(--text-muted)}.url-input:disabled{opacity:.6}.inspect-result{display:none;padding:16px;background:#ffffff80;border-radius:var(--radius-sm);border:1px solid var(--border-subtle);flex-direction:column;gap:10px}.inspect-result.show{display:flex;animation:fadeSlideUp .4s ease}.inspect-top-row{display:flex;align-items:center;gap:14px}.inspect-meta-col{display:flex;flex-direction:column;gap:4px;flex-shrink:0}.meta-item{font-size:12px;color:var(--text-secondary)}.thumbnail-wrap{width:140px;flex-shrink:0;height:auto;aspect-ratio:16/9;border-radius:8px;overflow:hidden;background:var(--bg)}.thumbnail-wrap img{width:100%;height:100%;object-fit:cover}.status-chip{display:inline-flex;align-items:center;gap:3px;padding:2px 8px;border-radius:999px;font-size:11px;font-weight:700;width:fit-content}.status-ok{background:var(--free-light);color:var(--free)}.video-title{font-size:13px;font-weight:600;color:var(--text-primary);overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}.loading-spinner{display:none;align-items:center;gap:8px;padding:14px 0;color:var(--text-secondary);font-size:13px}.loading-spinner.show{display:flex}.spinner{width:16px;height:16px;border:2px solid rgba(0,0,0,.08);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}.segment-control{display:inline-flex;background:#0000000a;border-radius:var(--radius-sm);padding:3px;margin-bottom:12px;width:100%;position:relative}.segment-btn{flex:1;padding:10px 16px;border:none;background:transparent;border-radius:8px;font-size:13px;font-weight:600;color:var(--text-tertiary);cursor:pointer;transition:all .25s ease;text-align:center;line-height:1.3}.segment-mp3.active{background:var(--bg-card-solid);color:var(--mp3-accent);box-shadow:var(--shadow-sm);border-bottom:2px solid var(--mp3-accent)}.segment-mp4.active{background:var(--bg-card-solid);color:var(--mp4-accent);box-shadow:var(--shadow-sm);border-bottom:2px solid var(--mp4-accent)}.segment-price-hint{display:block;font-size:11px;font-weight:500;margin-top:2px}.segment-mp3.active .segment-price-hint,.segment-mp4.active .segment-price-hint{color:var(--text-secondary)}.hint-free{color:var(--free)}.hint-paid{color:var(--text-muted)}.sub-step-label{display:flex;align-items:center;gap:6px;font-size:12px;font-weight:600;color:var(--text-secondary);margin-bottom:10px;padding-left:2px}.sub-step-num{display:inline-flex;align-items:center;justify-content:center;font-size:13px;font-weight:800;min-width:18px}.format-mp3 .sub-step-num{color:var(--mp3-accent)}.format-mp4 .sub-step-num{color:var(--mp4-accent)}.card:not(.disabled) .segment-btn:not(.active){animation:subtlePulse 2.5s ease-in-out .5s 2}@keyframes subtlePulse{0%,to{box-shadow:none}50%{box-shadow:0 0 0 2px rgba(var(--accent-rgb),.15)}}.range-group{display:flex;flex-direction:column;gap:0;margin-bottom:18px}.range-option{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;cursor:pointer;transition:all .2s ease;border:1px solid rgba(0,0,0,.06);margin-top:-1px}.range-option:first-child{border-radius:var(--radius-sm) var(--radius-sm) 0 0}.range-option:last-child{border-radius:0 0 var(--radius-sm) var(--radius-sm)}.range-option:hover{background:rgba(var(--accent-rgb),.03)}.format-mp3 .range-option.selected{background:var(--mp3-accent-light);border-color:rgba(var(--mp3-accent-rgb),.25);z-index:1;position:relative}.format-mp4 .range-option.selected{background:var(--mp4-accent-light);border-color:rgba(var(--mp4-accent-rgb),.25);z-index:1;position:relative}.range-option.over-limit{background:var(--danger-light)!important;border-color:#e5534b40!important}.range-left{display:flex;align-items:center;gap:10px}.radio-dot{width:18px;height:18px;border:2px solid var(--text-muted);border-radius:50%;position:relative;flex-shrink:0;transition:all .2s}.format-mp3 .range-option.selected .radio-dot{border-color:var(--mp3-accent)}.format-mp4 .range-option.selected .radio-dot{border-color:var(--mp4-accent)}.format-mp3 .range-option.selected .radio-dot:after{content:"";position:absolute;top:3px;left:3px;width:8px;height:8px;border-radius:50%;background:var(--mp3-gradient)}.format-mp4 .range-option.selected .radio-dot:after{content:"";position:absolute;top:3px;left:3px;width:8px;height:8px;border-radius:50%;background:var(--mp4-gradient)}.range-label{font-size:13px;font-weight:600;color:var(--text-primary)}.range-format-suffix{font-size:11px;font-weight:500;color:var(--text-tertiary);margin-left:1px}.range-label-wrap{display:flex;flex-direction:column;gap:4px;min-width:0}.range-label-row{display:flex;align-items:center;gap:6px}.range-recommend-badge{font-size:9px;font-weight:700;color:#fff;padding:1px 6px;border-radius:4px;background:var(--free-gradient);letter-spacing:.3px;flex-shrink:0}.range-duration-bar-wrap{display:flex;align-items:center;gap:6px;height:8px}.range-duration-bar{height:6px;border-radius:3px;background:#0000000f;transition:all .3s ease;min-width:16px}.format-mp3 .range-duration-bar.active{background:var(--mp3-gradient)}.format-mp4 .range-duration-bar.active{background:var(--mp4-gradient)}.range-duration-bar.bar-over{background:linear-gradient(90deg,var(--danger),#F87171)!important}.range-duration-limit{font-size:10px;font-weight:600;color:var(--text-muted);white-space:nowrap}.range-over-note{font-size:10px;color:var(--danger);font-weight:600;margin-top:-2px}.range-price{font-size:12px;font-weight:700;padding:3px 10px;border-radius:999px}.price-free{background:var(--free-light);color:var(--free)}.format-mp3 .price-paid{background:var(--mp3-accent-light);color:var(--mp3-accent)}.format-mp4 .price-paid{background:var(--mp4-accent-light);color:var(--mp4-accent)}.price-summary{background:linear-gradient(135deg,rgba(var(--accent-rgb),.06),rgba(var(--accent-rgb),.02));border:1px solid rgba(var(--accent-rgb),.1);border-radius:var(--radius-sm);padding:14px 16px;display:flex;flex-direction:column;gap:10px}.format-mp3 .price-summary{background:linear-gradient(135deg,rgba(var(--mp3-accent-rgb),.06),rgba(var(--mp3-accent-rgb),.02));border-color:rgba(var(--mp3-accent-rgb),.1)}.format-mp4 .price-summary{background:linear-gradient(135deg,rgba(var(--mp4-accent-rgb),.06),rgba(var(--mp4-accent-rgb),.02));border-color:rgba(var(--mp4-accent-rgb),.1)}.price-summary-row{display:flex;text-align:center;gap:4px}.price-summary-col{flex:1}.price-label{font-size:10px;color:var(--text-tertiary);margin-bottom:2px;white-space:nowrap}.price-value{font-size:26px;font-weight:800;color:var(--accent);letter-spacing:-1px}.price-value.is-free{color:var(--free)}.format-mp3 .price-value:not(.is-free){color:var(--mp3-accent)}.format-mp4 .price-value:not(.is-free){color:var(--mp4-accent)}.price-yen{font-size:11px;color:var(--text-secondary);font-weight:500;display:block}.price-col-value{font-weight:700;font-size:16px;color:var(--text-primary)}.format-mp3 .price-col-value{color:var(--mp3-accent)}.format-mp4 .price-col-value{color:var(--mp4-accent)}.truncation-viz{display:flex;flex-direction:column;gap:0}.truncation-label-top{display:flex;justify-content:flex-end;margin-bottom:3px}.truncation-label-limit{font-size:10px;font-weight:700;color:var(--accent);white-space:nowrap}.format-mp3 .truncation-label-limit{color:var(--mp3-accent)}.format-mp4 .truncation-label-limit{color:var(--mp4-accent)}.truncation-bar{display:flex;height:10px;border-radius:5px;overflow:hidden;background:#0000000a}.truncation-bar-output{background:var(--accent-gradient);border-radius:5px 0 0 5px;transition:width .4s ease}.format-mp3 .truncation-bar-output{background:var(--mp3-gradient)}.format-mp4 .truncation-bar-output{background:var(--mp4-gradient)}.truncation-bar-over{background:repeating-linear-gradient(-45deg,#e5534b2e,#e5534b2e 3px,#e5534b59 3px 6px);border-left:2px solid var(--danger);border-radius:0 5px 5px 0;transition:width .4s ease}.truncation-bar-video{background:var(--accent-gradient);border-radius:5px 0 0 5px;transition:width .4s ease}.format-mp3 .truncation-bar-video{background:var(--mp3-gradient)}.format-mp4 .truncation-bar-video{background:var(--mp4-gradient)}.truncation-bar-remaining{background:rgba(var(--accent-rgb),.12);border-left:1px dashed rgba(var(--accent-rgb),.25)}.format-mp3 .truncation-bar-remaining{background:rgba(var(--mp3-accent-rgb),.12);border-left-color:rgba(var(--mp3-accent-rgb),.25)}.format-mp4 .truncation-bar-remaining{background:rgba(var(--mp4-accent-rgb),.12);border-left-color:rgba(var(--mp4-accent-rgb),.25)}.truncation-label-bottom{display:flex;justify-content:space-between;align-items:center;margin-top:3px;min-height:16px}.truncation-label-duration{font-size:10px;font-weight:600;color:var(--accent)}.format-mp3 .truncation-label-duration{color:var(--mp3-accent)}.format-mp4 .truncation-label-duration{color:var(--mp4-accent)}.truncation-label-cut{font-size:10px;font-weight:700;color:var(--danger)}.truncation-label-ok{font-size:10px;font-weight:700;color:var(--free)}.truncation-note{font-size:11px;color:var(--text-muted);margin-top:6px}.truncation-note.truncation-note-over{color:var(--danger);font-weight:600}.generate-section{text-align:center}.generate-btn-wrap{margin-bottom:20px}.generate-note{font-size:11px;color:var(--text-muted);margin-top:10px}.progress-section{display:none;margin-bottom:20px}.progress-section.show{display:block;animation:fadeSlideUp .4s ease}.progress-bar-wrap{background:#0000000f;border-radius:999px;height:10px;overflow:hidden;margin-bottom:12px;transition:box-shadow .6s ease}.progress-bar-fill{height:100%;border-radius:999px;transition:width .15s linear,background .8s ease;position:relative}.progress-bar-fill:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent,rgba(255,255,255,.4),transparent);animation:shimmer 1.8s ease infinite}.progress-bar-fill.progress-phase-preparing{background:linear-gradient(90deg,#cbd5e1,#94a3b8,#cbd5e1);background-size:200% 100%;animation:preparePulse 1.5s ease-in-out infinite;opacity:.6}.progress-bar-wrap.progress-phase-preparing{box-shadow:none}@keyframes preparePulse{0%,to{opacity:.4;background-position:0% 50%}50%{opacity:.8;background-position:100% 50%}}.progress-bar-fill.progress-phase-downloading{background:linear-gradient(90deg,var(--accent),var(--accent-highlight),var(--accent));background-size:200% 100%;animation:gradientFlow 2s ease infinite}.progress-bar-wrap.progress-phase-downloading{box-shadow:0 0 12px rgba(var(--accent-rgb),.3)}.progress-bar-fill.progress-phase-converting{background:linear-gradient(90deg,#8b5cf6,#a855f7,#8b5cf6);background-size:200% 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8px}.btn-download{display:inline-flex;align-items:center;gap:10px;background:var(--free-gradient);color:#fff;padding:18px 56px;font-size:18px;font-weight:800;border:none;border-radius:14px;cursor:pointer;transition:all .2s ease;box-shadow:0 4px 16px #2eae7b4d;letter-spacing:-.3px;text-decoration:none}.btn-download:hover{box-shadow:0 6px 24px #2eae7b66;transform:translateY(-2px)}.btn-download:active{transform:translateY(0) scale(.98)}.btn-download-icon{font-size:20px}.reset-wrap{margin-top:16px}.btn-reset{display:inline-flex;align-items:center;gap:4px;background:transparent;color:var(--text-tertiary);padding:8px 16px;font-size:12px;font-weight:600;border:1px solid rgba(0,0,0,.06);border-radius:8px;cursor:pointer;transition:all .15s}.btn-reset:hover{background:#00000008;color:var(--text-secondary)}.ttl-note{font-size:11px;color:var(--text-muted);margin-top:12px}.fail-section{display:none;text-align:center}.fail-section.show{display:block;animation:fadeSlideUp .4s ease}.fail-icon{font-size:44px;margin-bottom:8px}.fail-msg{font-size:14px;color:var(--danger);font-weight:700;margin-bottom:12px}.fail-note{font-size:12px;color:var(--text-secondary);background:var(--danger-light);padding:10px 16px;border-radius:8px;display:inline-block}.message-area{position:fixed;bottom:0;left:0;right:0;background:#1e293beb;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);color:#fff;padding:7px 16px;font-size:12px;display:flex;align-items:center;gap:8px;z-index:99}.msg-dot{width:5px;height:5px;border-radius:50%;flex-shrink:0}.msg-dot.info{background:var(--accent)}.msg-dot.ok{background:var(--free)}.msg-dot.err{background:var(--danger)}@keyframes fadeSlideUp{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes shimmer{0%{transform:translate(-100%)}to{transform:translate(200%)}}@media(max-width:768px){.main{padding:20px 12px}.card{padding:20px}.btn-download{padding:16px 44px;font-size:16px}.progress-pct{font-size:24px}}@media(max-width:640px){body{padding-bottom:120px}.header{padding:0 12px}.header-inner{gap:2px;padding:6px 0}.header-top-row{gap:6px}.logo{font-size:13px}.credit-pill{font-size:11px;padding:3px 10px;flex-shrink:0}.header-buy-row{gap:4px;justify-content:center}.btn-sm{padding:4px 8px;font-size:11px;flex-shrink:0}.btn-buy{font-size:11px;padding:4px 8px;flex-shrink:0}.main{padding:16px 10px}.hero-text{font-size:13px;margin-bottom:20px}.card{padding:16px;margin-bottom:10px;border-radius:14px}.card-title{font-size:13px;margin-bottom:12px;flex-wrap:wrap}.card-subtitle{display:block;width:100%;margin-left:0;margin-top:2px;font-size:11px}.step-num{width:20px;height:20px;font-size:10px;border-radius:6px}.url-row{flex-direction:column}.url-input{font-size:16px;padding:12px;border-radius:10px}.url-row .btn{padding:12px 20px;font-size:14px;border-radius:10px}.inspect-result{padding:12px}.inspect-top-row{gap:10px;align-items:center}.thumbnail-wrap{width:100px;flex-shrink:0;border-radius:8px}.inspect-meta-col{gap:3px}.meta-item{font-size:11px}.video-title{font-size:13px}.segment-control{border-radius:10px}.segment-btn{padding:10px 8px;font-size:12px}.segment-price-hint{font-size:10px}.range-option{padding:12px 14px}.range-label{font-size:12px}.range-price{font-size:11px}.range-format-suffix{font-size:10px}.price-summary{padding:12px 14px}.price-value{font-size:22px}.price-col-value{font-size:14px}.progress-bar-wrap{height:8px;margin-bottom:10px}.progress-pct{font-size:22px}.progress-phase{font-size:12px}.progress-eta{font-size:11px}.generate-section .btn-primary{width:100%;padding:16px 20px!important;font-size:15px!important;border-radius:12px!important}.generate-note{font-size:10px}.btn-download{width:100%;padding:16px 24px;font-size:16px;border-radius:12px;justify-content:center}.complete-icon{font-size:44px}.complete-msg{font-size:15px;margin-bottom:16px}.ttl-note{font-size:10px}.btn-reset{font-size:11px}.fail-icon{font-size:36px}.fail-msg{font-size:13px}.fail-note{font-size:11px;padding:8px 12px}.message-area{padding:6px 12px;font-size:11px}}@media(max-width:375px){.header-inner{gap:2px}.logo{font-size:12px}.credit-pill{font-size:10px;padding:3px 8px}.header-buy-row{gap:3px}.btn-buy{font-size:10px;padding:3px 6px}.card{padding:14px}.progress-pct,.price-value{font-size:20px}.price-col-value{font-size:13px}.btn-download{font-size:15px;padding:14px 20px}}