:root{color-scheme:light;--canvas:#f3f0ee;--canvas-2:#ebe6e1;--surface:#fcfbfa;--surface-2:#ffffff;--ink:#141413;--ink-soft:#262627;--muted:#696969;--line:#d1cdc7;--line-strong:rgba(20, 20, 19, 0.24);--orange:#cf4500;--orange-soft:#f37338;--blue:#3860be;--green:#2a7a4b;--error:#c0392b;--shadow-soft:0 4px 24px rgba(0, 0, 0, 0.04);--shadow-card:0 24px 48px rgba(0, 0, 0, 0.08);--r-sm:6px;--r-btn:20px;--r-card:40px;--r-pill:999px;--nav-h:68px;--max:780px;--wide:1120px;--ease:cubic-bezier(0.16, 1, 0.3, 1);--m3e-progress-indicator-color:var(--blue);--m3e-progress-indicator-track-color:var(--line);--m3e-loading-indicator-active-indicator-color:var(--ink);--m3e-loading-indicator-contained-active-indicator-color:var(--ink);--m3e-loading-indicator-contained-container-color:var(--canvas-2)}[data-theme=dark]{color-scheme:dark;--canvas:#11100f;--canvas-2:#1a1817;--surface:#211f1d;--surface-2:#2a2725;--ink:#f7f1ec;--ink-soft:#e3d9d1;--muted:#ada29a;--line:#3a3531;--line-strong:rgba(247, 241, 236, 0.22);--orange:#ff8a4c;--orange-soft:#ffad76;--blue:#8faeff;--green:#7ed89d;--error:#ff8b80;--shadow-soft:0 12px 34px rgba(0, 0, 0, 0.28);--shadow-card:0 26px 70px rgba(0, 0, 0, 0.42);--m3e-progress-indicator-color:var(--orange-soft);--m3e-progress-indicator-track-color:var(--line);--m3e-loading-indicator-active-indicator-color:var(--orange-soft);--m3e-loading-indicator-contained-active-indicator-color:var(--orange-soft);--m3e-loading-indicator-contained-container-color:#302822}*,::after,::before{box-sizing:border-box}*{margin:0;padding:0;letter-spacing:0}html{min-width:320px;width:100%;max-width:100%;overflow-x:hidden;scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{min-height:100vh;overflow-x:hidden;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;font-size:16px;font-weight:450;line-height:1.45;color:var(--ink);background:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px),var(--canvas);background-size:72px 72px,72px 72px,auto;background-blend-mode:soft-light}.app-shell,.hero,.seo-support,footer,main{max-width:100vw;overflow-x:hidden}[data-theme=dark] body{background:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px),var(--canvas);background-size:72px 72px,72px 72px,auto}a{color:inherit;text-decoration:none}button,input{font:inherit}button{border:0;background:0 0;color:inherit;cursor:pointer}iframe,img,video{display:block;max-width:100%}:focus-visible{outline:3px solid color-mix(in srgb,var(--blue),transparent 68%);outline-offset:3px}.hidden{display:none!important}.nav-pill{position:fixed;z-index:50;top:20px;left:50%;width:min(980px,calc(100% - 32px));min-height:var(--nav-h);transform:translateX(-50%);display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:18px;padding:10px 14px 10px 22px;border:1px solid color-mix(in srgb,var(--line-strong),transparent 12%);border-radius:var(--r-pill);background:color-mix(in srgb,var(--surface-2),transparent 7%);box-shadow:var(--shadow-soft);backdrop-filter:blur(18px)}.footer-brand,.nav-logo{display:inline-flex;align-items:center;gap:10px}.nav-icon{width:32px;height:32px}.footer-wordmark,.nav-wordmark{font-size:20px;font-weight:700;line-height:1}.nav-links{display:flex;justify-content:center;gap:6px;min-width:0;overflow-x:auto;scrollbar-width:none}.nav-links::-webkit-scrollbar{display:none}.nav-links a{display:inline-flex;align-items:center;min-height:42px;padding:0 16px;border-radius:var(--r-pill);color:var(--ink-soft);font-size:15px;font-weight:500;white-space:nowrap;transition:background 220ms var(--ease),transform 220ms var(--ease)}.nav-links a:hover{background:var(--canvas-2);transform:translateY(-1px)}.nav-actions{display:inline-flex;align-items:center;justify-content:flex-end;gap:8px;min-width:0}.support-link{min-height:42px;display:inline-flex;align-items:center;gap:8px;padding:0 14px 0 10px;border:1px solid color-mix(in srgb,var(--orange),transparent 34%);border-radius:var(--r-pill);background:color-mix(in srgb,var(--orange-soft),transparent 88%);color:var(--ink);font-size:14px;font-weight:800;white-space:nowrap;transition:transform 220ms var(--ease),background 220ms var(--ease),border-color 220ms var(--ease)}.support-link:hover{transform:translateY(-1px);border-color:var(--orange);background:color-mix(in srgb,var(--orange-soft),transparent 78%)}.support-mark{width:24px;height:24px;display:grid;place-items:center;border-radius:50%;background:var(--ink);color:var(--surface);font-size:13px;font-weight:900;line-height:1}.theme-toggle{width:48px;height:48px;display:grid;place-items:center;border:1px solid var(--line-strong);border-radius:50%;background:var(--surface);box-shadow:var(--shadow-soft);transition:transform 220ms var(--ease),background 220ms var(--ease)}.theme-toggle:hover{transform:translateY(-2px) rotate(8deg)}.theme-toggle .moon,[data-theme=dark] .theme-toggle .sun{display:none}[data-theme=dark] .theme-toggle .moon{display:block}.app-shell{min-height:calc(100vh - 160px)}.hero{position:relative;min-height:0;padding:134px 24px clamp(52px,8vh,84px);display:flex;flex-direction:column;align-items:center;isolation:isolate}.hero-watermark{position:absolute;z-index:-1;top:96px;left:50%;transform:translateX(-50%);color:var(--ink);opacity:.04;font-size:clamp(76px, 15vw, 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li::before{content:"";position:absolute;left:0;top:.68em;width:6px;height:6px;border-radius:50%;background:var(--orange)}.seo-faq{margin-top:34px;padding-top:26px;border-top:1px solid var(--line)}.seo-faq-list{margin-top:14px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 28px}.seo-faq details{min-width:0;border-bottom:1px solid var(--line)}.seo-faq summary{min-height:58px;display:flex;align-items:center;justify-content:space-between;gap:18px;color:var(--ink);font-size:15px;font-weight:800;line-height:1.35;cursor:pointer;list-style:none}.seo-faq summary::-webkit-details-marker{display:none}.seo-faq summary::after{content:"+";flex:0 0 auto;width:26px;height:26px;display:grid;place-items:center;border:1px solid var(--line-strong);border-radius:50%;color:var(--ink);font-size:18px;font-weight:500;transition:transform 180ms var(--ease),background 180ms var(--ease)}.seo-faq details[open] summary::after{transform:rotate(45deg);background:var(--ink);color:var(--surface)}.seo-faq details p{margin:-2px 0 18px;color:var(--muted);font-size:15px;line-height:1.6}.related-tools{margin-top:26px;display:flex;flex-wrap:wrap;gap:10px}.related-tools a{min-height:38px;display:inline-flex;align-items:center;padding:0 14px;border:1px solid var(--line-strong);border-radius:var(--r-pill);background:var(--surface);color:var(--ink);font-size:14px;font-weight:700;transition:transform 180ms var(--ease),background 180ms var(--ease)}.related-tools a:hover{transform:translateY(-1px);background:var(--canvas-2)}.url-input-container{position:relative;width:100%;max-width:100%;min-height:68px;display:grid;grid-template-columns:1fr auto;align-items:center;gap:10px;padding:8px 8px 8px 24px;border:1.5px solid color-mix(in srgb,var(--ink),transparent 28%);border-radius:var(--r-pill);background:var(--surface);box-shadow:var(--shadow-card);transition:border-color 220ms var(--ease),box-shadow 220ms var(--ease),transform 220ms var(--ease)}.url-input-container:focus-within{border-color:var(--ink);box-shadow:0 0 0 5px color-mix(in srgb,var(--orange-soft),transparent 82%),var(--shadow-card);transform:translateY(-1px)}.url-input-container.error{border-color:var(--error)}.url-input{width:100%;min-width:0;height:48px;border:0;outline:0;background:0 0;color:var(--ink);font-size:17px;font-weight:500}.url-input::placeholder{color:color-mix(in srgb,var(--muted),transparent 24%)}.download-btn,.retry-btn,.submit-btn,.url-submit-btn{min-height:50px;display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:0 24px;border-radius:var(--r-btn);background:var(--ink);color:var(--canvas);font-size:16px;font-weight:500;transition:transform 180ms var(--ease),opacity 180ms var(--ease),box-shadow 180ms var(--ease)}.download-btn:hover,.retry-btn:hover,.submit-btn:hover,.url-submit-btn:hover{transform:translateY(-2px)}.download-btn:active,.retry-btn:active,.submit-btn:active,.url-submit-btn:active{transform:translateY(0) scale(.98)}.submit-btn:disabled,.url-submit-btn:disabled{cursor:wait;opacity:.65}.url-error{width:fit-content;max-width:min(100%,720px);min-height:0;margin:12px auto 0;padding:8px 12px;border:1px solid transparent;border-radius:var(--r-pill);background:0 0;color:var(--error);font-size:14px;font-weight:700;text-align:center;line-height:1.35}.url-error:empty{display:none}.url-error.is-error{border-color:color-mix(in srgb,var(--error),transparent 62%);background:color-mix(in srgb,var(--error),transparent 92%)}.url-error.is-warning{border-color:color-mix(in srgb,var(--orange),transparent 58%);background:color-mix(in srgb,var(--orange-soft),transparent 90%);color:color-mix(in srgb,var(--orange),var(--ink) 25%)}.audio-player-wrap,.error-banner,.metadata-card,.preview-panel,.progress-section,.result-card,.result-preview-wrap{width:100%;border:1px solid color-mix(in srgb,var(--line-strong),transparent 26%);border-radius:var(--r-card);background:color-mix(in srgb,var(--surface),transparent 2%);box-shadow:var(--shadow-card)}.metadata-card{margin-top:10px;padding:20px;animation:panelIn 360ms var(--ease);contain:layout paint}@keyframes panelIn{from{opacity:0;transform:translateY(18px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}.metadata-loading{display:flex;align-items:center;gap:16px;min-height:96px;color:var(--muted)}.metadata-loading strong,.progress-topline strong{display:block;color:var(--ink);font-size:17px;font-weight:700}.metadata-loading span,.progress-topline span{display:block;margin-top:2px;color:var(--muted);font-size:14px}.metadata-content{display:grid;grid-template-columns:212px 1fr;gap:20px;align-items:center}.metadata-thumb-wrap{width:100%;aspect-ratio:16/9;overflow:hidden;border-radius:24px;background:var(--canvas-2)}.metadata-thumb{width:100%;height:100%;object-fit:cover}.metadata-info{min-width:0;display:flex;flex-direction:column;gap:8px}.metadata-platform{display:inline-flex;align-items:center;gap:8px;color:var(--muted);font-size:12px;font-weight:700;text-transform:uppercase}.metadata-title{color:var(--ink);font-size:clamp(20px, 4vw, 26px);font-weight:500;line-height:1.18;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.metadata-duration{color:var(--muted);font-size:14px;font-variant-numeric:tabular-nums}.preview-play-btn{align-self:flex-start;min-height:40px;display:inline-flex;align-items:center;gap:8px;padding:0 16px;border:1px solid var(--line-strong);border-radius:var(--r-pill);background:var(--surface-2);color:var(--ink);font-size:14px;font-weight:700;transition:transform 180ms var(--ease),background 180ms var(--ease)}.preview-play-btn:hover{transform:translateY(-1px);background:var(--canvas-2)}.preview-panel{margin-top:14px;overflow:hidden;contain:layout paint}.preview-panel iframe{width:100%;aspect-ratio:16/9;border:0;background:#000}.preview-panel-close{width:100%;min-height:48px;display:flex;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:1px solid var(--line);color:var(--muted);font-size:14px;font-weight:700}.preview-message{display:grid;place-items:center;min-height:180px;padding:24px;color:var(--muted);text-align:center}.preview-message a{color:var(--blue);font-weight:700;text-decoration:underline;text-underline-offset:3px}.operation-section{width:100%;margin-top:20px;display:flex;flex-direction:column;align-items:center;gap:18px;animation:panelIn 360ms var(--ease)}.operation-selector{width:100%;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}.op-pill{min-height:56px;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:0 14px;border:1.5px solid var(--line-strong);border-radius:var(--r-pill);background:color-mix(in srgb,var(--surface),transparent 14%);color:var(--ink);font-size:15px;font-weight:700;transition:transform 180ms var(--ease),background 180ms var(--ease),color 180ms var(--ease),border-color 180ms var(--ease)}.op-pill:hover{transform:translateY(-2px);background:var(--surface)}.op-pill.selected{border-color:var(--ink);background:var(--ink);color:var(--canvas)}.chip-section{width:100%;display:grid;gap:10px;justify-items:center}.chip-label{color:var(--muted);font-size:12px;font-weight:700;text-transform:uppercase}.chip-group{width:100%;display:flex;flex-wrap:wrap;justify-content:center;gap:8px}.chip{min-height:42px;display:inline-flex;align-items:center;justify-content:center;padding:0 16px;border:1px solid var(--line-strong);border-radius:var(--r-pill);background:var(--surface);color:var(--ink);font-size:14px;font-weight:700;transition:transform 180ms var(--ease),background 180ms var(--ease),color 180ms var(--ease)}.chip:hover{transform:translateY(-1px)}.chip.selected{border-color:var(--blue);background:var(--blue);color:#fff}[data-theme=dark] .chip.selected{color:#11100f}.chip.unavailable,.chip:disabled{opacity:.42;cursor:not-allowed;text-decoration:line-through}.submit-btn{width:100%;border-radius:var(--r-pill)}.progress-section{margin-top:16px;padding:22px;display:grid;gap:16px;animation:panelIn 360ms var(--ease);contain:layout paint}.progress-topline{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:14px;align-items:center}.progress-topline m3e-loading-indicator{inline-size:42px;block-size:42px}.progress-meter{--progress-value:0%;position:relative;width:100%;height:12px;overflow:hidden;border:1px solid color-mix(in srgb,var(--line-strong),transparent 22%);border-radius:var(--r-pill);background:color-mix(in srgb,var(--line),transparent 46%);box-shadow:inset 0 1px 2px rgba(0,0,0,.08)}.progress-meter-fill{position:absolute;inset:1px;width:calc(100% - 2px);border-radius:inherit;background:linear-gradient(90deg,var(--blue),color-mix(in srgb,var(--green),var(--blue) 28%));transform:scaleX(0);transform-origin:left center;transition:transform 760ms var(--ease);will-change:transform}[data-theme=dark] .progress-meter{background:color-mix(in srgb,var(--surface-2),transparent 18%);box-shadow:inset 0 1px 2px rgba(0,0,0,.32)}[data-theme=dark] .progress-meter-fill{background:linear-gradient(90deg,var(--orange-soft),color-mix(in srgb,var(--green),var(--orange-soft) 18%))}.progress-percent{min-width:48px;justify-self:end;margin-top:0;padding:7px 10px;border:1px solid var(--line-strong);border-radius:var(--r-pill);background:var(--canvas-2);color:var(--blue);font-size:13px;font-weight:700;font-variant-numeric:tabular-nums;text-align:center}.progress-stages{display:grid;grid-template-columns:auto 1fr auto 1fr auto;align-items:center;gap:8px}.stage{min-height:30px;display:inline-flex;align-items:center;justify-content:center;padding:0 12px;border-radius:var(--r-pill);background:var(--canvas-2);color:var(--muted);font-size:13px;font-weight:700}.stage.active{background:color-mix(in srgb,var(--blue),transparent 84%);color:var(--blue)}.stage.done{background:color-mix(in srgb,var(--green),transparent 84%);color:var(--green)}.stage-divider{height:1px;background:var(--line)}.result-section{width:100%;margin-top:16px;display:grid;gap:14px}.result-card{padding:24px;display:grid;gap:18px;animation:panelIn 360ms var(--ease);contain:layout paint}.result-badge{display:flex;align-items:center;justify-content:space-between;gap:12px}.badge-ready{min-height:30px;display:inline-flex;align-items:center;padding:0 12px;border-radius:var(--r-pill);background:color-mix(in srgb,var(--green),transparent 84%);color:var(--green);font-size:13px;font-weight:700}.result-size{color:var(--muted);font-size:13px;font-weight:700}.download-btn{width:100%;min-height:58px;border-radius:var(--r-pill)}.timer-section{display:grid;gap:4px;justify-items:center;padding:6px 0 2px}.timer-label{color:var(--muted);font-size:13px;font-weight:700}.timer-display{color:var(--ink);font-size:clamp(38px, 8vw, 54px);font-weight:500;line-height:1;font-variant-numeric:tabular-nums}.timer-display.critical,.timer-display.warning{color:var(--orange)}.timer-display.critical{animation:timerPulse 1s ease-in-out infinite}@keyframes timerPulse{0%,100%{opacity:1}50%{opacity:.55}}.result-actions{display:flex;justify-content:center;gap:18px}.result-actions button{min-height:38px;color:var(--ink);font-size:14px;font-weight:700;text-decoration:underline;text-underline-offset:4px}.audio-player-wrap,.result-preview-wrap{overflow:hidden;contain:layout paint}.result-preview-player{width:100%;max-height:420px;background:#000}.eq-header{padding:20px 20px 0;background:var(--ink)}.eq-title-row{display:flex;align-items:flex-end;justify-content:space-between;gap:16px}.eq-file-label{padding-bottom:7px;color:color-mix(in srgb,var(--canvas),transparent 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18px;background:var(--surface)}.eq-pp-btn{flex-shrink:0;width:42px;height:42px;display:grid;place-items:center;border-radius:50%;background:var(--ink);color:var(--canvas)}.eq-seek-wrap{flex:1;display:grid;gap:7px}.eq-seek-rail{position:relative;height:6px;border-radius:var(--r-pill);background:var(--line);cursor:pointer}.eq-seek-fill{position:absolute;inset:0 auto 0 0;width:0%;border-radius:inherit;background:var(--orange-soft)}.eq-seek-thumb{position:absolute;top:50%;left:0;width:14px;height:14px;border-radius:50%;background:var(--orange-soft);transform:translate(-50%,-50%);opacity:0}.eq-seek-rail:hover .eq-seek-thumb{opacity:1}.eq-time-row{display:flex;justify-content:space-between;color:var(--muted);font-size:12px;font-weight:700;font-variant-numeric:tabular-nums}.error-section{width:100%;margin-top:14px}.error-banner{min-height:72px;padding:14px;display:grid;grid-template-columns:34px 1fr auto;align-items:center;gap:12px;border-color:color-mix(in srgb,var(--error),transparent 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