:root{--purple:#7025d4;--purple-dark:#5318a5;--light:#f7f2ff;--line:#e7e4eb;--muted:#555;--ink:#000;font-family:Arial,Helvetica,sans-serif;color:#000;background:#fff;font-synthesis:none}*{box-sizing:border-box}img{max-width:100%;height:auto}body{margin:0}a{color:var(--purple);text-underline-offset:3px}a:hover{color:var(--purple-dark)}button,input,select{font:inherit}button,a,summary,input,select{touch-action:manipulation}button{cursor:pointer}button:disabled{opacity:.45;cursor:not-allowed}[hidden]{display:none!important}:focus-visible{outline:3px solid #b788f3;outline-offset:4px}.container{max-width:1280px;margin:auto;padding:0 30px}.header{position:sticky;top:0;z-index:20;background:#fff;border-bottom:1px solid var(--line)}.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:84px;gap:30px}.brand{font-size:23px;letter-spacing:-.8px;font-weight:800;text-decoration:none;color:#000;white-space:nowrap;display:flex;gap:9px;align-items:center}.brand-mark{background:var(--purple);color:white;border-radius:10px;width:36px;height:38px;display:grid;place-items:center;font-size:23px}.brand span:last-child{font-weight:400}.header nav{display:flex;gap:25px;align-items:center;font-size:13px}.header nav>a,.header summary{color:#000;text-decoration:none;cursor:pointer}.header details{position:relative}.header summary{list-style:none}.header summary:after{content:'⌄';margin-left:8px;color:var(--purple)}.dropdown{position:absolute;top:33px;left:-15px;background:#fff;border:1px solid var(--line);box-shadow:0 15px 40px #0001;min-width:210px;padding:12px;border-radius:10px}.dropdown a{display:block;padding:10px;text-decoration:none;color:#000;border-radius:6px}.dropdown a:hover{background:var(--light)}.top-note{padding:9px;text-align:center;background:var(--light);font-size:11px;color:#512888}.hero{padding:42px 0 28px}.eyebrow{font-size:11px;text-transform:uppercase;letter-spacing:1.6px;font-weight:700;color:var(--purple);margin:0 0 15px}h1{font-size:43px;line-height:1.12;letter-spacing:-1.8px;max-width:920px;margin:0 0 17px}h1 span{color:var(--purple)}.intro{font-size:16px;line-height:1.7;color:#000;max-width:850px;margin:0}.breadcrumb{font-size:11px;color:#000;padding-top:24px}.breadcrumb a{color:#000;text-decoration:none}.quick-links{display:flex;gap:10px;flex-wrap:wrap;margin-top:21px}.pill{padding:9px 13px;background:#fff;border:1px solid var(--line);border-radius:30px;text-decoration:none;font-size:11px;color:#000}.pill:hover{border-color:var(--purple);color:var(--purple)}.converter{border:1px solid var(--line);border-radius:14px;display:grid;grid-template-columns:355px 1fr;overflow:hidden;margin-bottom:20px;box-shadow:0 10px 35px #270a5108;scroll-margin-top:110px}.tool-controls{padding:24px;border-right:1px solid var(--line)}.section-label{font-size:12px;font-weight:700;display:flex;gap:8px;align-items:center;margin:0 0 15px}.num{width:23px;height:23px;display:grid;place-items:center;background:var(--light);color:var(--purple);font-size:10px;border-radius:50%}.drop{background:#fcfaff;border:1px dashed #bc9edb;border-radius:9px;min-height:155px;position:relative;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:8px;cursor:pointer;text-align:center;padding:15px}.drop:focus-within,.dragover{outline:2px solid var(--purple)}.drop input{position:absolute;inset:0;opacity:0;width:100%;height:100%;cursor:pointer}.upload-icon{font-size:30px;color:var(--purple)}.drop strong{font-size:13px}.drop small{font-size:10px;color:#000}.drop img{max-width:100%;max-height:100px;object-fit:contain;background:repeating-conic-gradient(#eee 0% 25%,white 0% 50%) 50%/16px 16px}#filename{font-size:10px;margin:9px 0 24px;overflow-wrap:anywhere;min-height:12px;color:#000}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.field{display:block;font-size:11px;margin-bottom:16px}.field input,.field select{width:100%;height:39px;border:1px solid #d8d3df;background:#fff;border-radius:6px;padding:8px 9px;color:#000;font-size:12px;margin-top:7px}.field small{display:block;color:#000;font-size:10px;line-height:1.5;margin-top:6px}.form-grid .field{margin-bottom:0}.check{display:flex;align-items:center;gap:8px;font-size:11px;margin:12px 0}.check input{accent-color:var(--purple)}.advanced{border-top:1px solid var(--line);margin-top:16px;padding-top:14px;font-size:11px}.advanced summary{cursor:pointer;margin-bottom:15px}.primary,.download{display:inline-flex;align-items:center;justify-content:center;gap:10px;background:var(--purple);color:#fff;text-decoration:none;border:0;border-radius:7px;padding:13px 20px;font-size:12px;font-weight:600}.primary:hover,.download:hover{background:var(--purple-dark);color:white}#convert{width:100%;margin-top:15px}.secondary{border:1px solid #ccc;background:white;color:#000;padding:8px 13px;border-radius:6px;font-size:11px}#cancel{margin-top:10px}.status{font-size:11px;line-height:1.6;color:#000;min-height:34px;margin-bottom:0}.error{color:#a22424}.preview-area{display:flex;flex-direction:column;background:#fff;min-width:0}.preview-head{display:flex;justify-content:space-between;align-items:center;padding:23px;font-size:12px;border-bottom:1px solid #f1eef4}.preview-head .check{margin:0;color:#000;font-size:10px}.viewport{position:relative;flex:1;min-height:425px;background:radial-gradient(ellipse,#fff 30%,#faf9fc 100%)}.viewport canvas{display:block;touch-action:none}.empty-preview{position:absolute;inset:0;display:grid;place-content:center;text-align:center;pointer-events:none;padding:30px;color:#000;font-size:12px;line-height:1.7}.empty-icon{width:58px;height:58px;border:1px solid #ded8e5;border-radius:16px;margin:0 auto 15px;display:grid;place-content:center;font-size:28px;color:#b9afc5}.empty-preview strong{font-size:15px;color:#000;font-weight:500}.preview-bottom{border-top:1px solid var(--line);padding:18px 22px;display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap}.preview-bottom small{font-size:10px;color:#000;display:block;margin-bottom:10px}#metrics{font-size:11px;line-height:1.6}.trust{display:flex;justify-content:space-between;font-size:11px;color:#000;padding:0 8px 28px;gap:12px;border-bottom:1px solid var(--line)}.trust b{color:var(--purple);margin-right:6px}.section{padding:45px 0;scroll-margin-top:100px}.section+.section{border-top:1px solid var(--line)}h2{font-size:28px;line-height:1.2;letter-spacing:-.7px;margin:0 0 18px}h3{font-size:18px;line-height:1.35;margin:20px 0 12px}h4{font-size:15px;margin:18px 0 10px}p,li{line-height:1.8}.section>p{font-size:14px;color:#000;max-width:900px}.section-head{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:20px}.section-head h2{margin:0}.section-head a{font-size:12px}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.card{border:1px solid var(--line);border-radius:10px;padding:22px;background:#fff;display:flex;flex-direction:column}.card h3{margin:8px 0 10px;font-size:18px}.card p{font-size:12px;color:#000;margin:0 0 18px}.card a.more{font-size:12px;margin-top:auto;font-weight:600;text-decoration:none}.card-label{font-size:10px;color:var(--purple);font-weight:700;letter-spacing:1px}.card .button-row{margin-top:auto;display:flex;gap:10px;align-items:center;flex-wrap:wrap}.button-row a{font-size:11px}.card:hover{border-color:#b58bdf}.article-card{padding:0;overflow:hidden}.article-card img{width:100%;aspect-ratio:3/2;object-fit:cover}.article-card .card-content{padding:22px;display:flex;flex-direction:column;flex:1}.split{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}.split img{width:100%;border-radius:12px}.split p{font-size:14px;color:#000}.caption{font-size:10px!important;color:#000!important}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}.steps .step-number{color:var(--purple);font-size:12px}.steps h3{margin-top:13px;font-size:17px}.steps p{font-size:13px;color:#000}.content-width{max-width:870px}.format-table{width:100%;border-collapse:collapse;font-size:13px;margin:25px 0}.format-table th,.format-table td{text-align:left;vertical-align:top;padding:14px;border-bottom:1px solid var(--line)}.format-table th{width:27%;background:#faf8fc}.faqs details{border-bottom:1px solid var(--line);padding:18px 0}.faqs summary{cursor:pointer;font-size:14px;font-weight:600}.faqs p{font-size:13px;color:#000;max-width:900px}.search-input{display:block;border:1px solid #d8d3df;border-radius:8px;width:100%;max-width:600px;padding:14px;margin:25px 0;font-size:14px}.article-layout{display:grid;grid-template-columns:minmax(0,800px) 260px;gap:60px;padding:30px 0 60px}.article-body{font-size:15px;color:#000}.article-body .standfirst{font-size:19px;line-height:1.65;color:#000;margin-top:0}.article-body h2{margin-top:40px;color:#000;scroll-margin-top:110px}.article-body h3{margin-top:28px;color:#000}.article-body p{margin:16px 0}.article-body li{padding:4px 0}.article-hero{width:100%;aspect-ratio:3/2;object-fit:cover;border-radius:12px;margin-bottom:8px}.meta{font-size:11px;color:#000;margin-top:15px}.toc{position:sticky;top:110px;align-self:start;background:#faf8fd;border:1px solid var(--line);border-radius:9px;padding:22px;font-size:12px}.toc h2{font-size:16px;letter-spacing:0}.toc a{display:block;color:#000;text-decoration:none;padding:8px 0;line-height:1.5}.toc a:hover{color:var(--purple)}.callout{background:var(--light);border-left:3px solid var(--purple);padding:20px 24px;font-size:13px;margin:25px 0}.footer{border-top:1px solid var(--line);margin-top:35px;padding:40px 0 20px;background:#fff}.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:30px}.footer h3{font-size:12px;margin:0 0 15px}.footer a{display:block;color:#000;font-size:11px;text-decoration:none;padding:5px 0}.footer p{font-size:11px;color:#000;max-width:250px}.footer .brand{font-size:20px;color:#000;display:flex;padding:0}.footer-bottom{border-top:1px solid var(--line);margin-top:30px;padding-top:18px;font-size:10px;color:#000;display:flex;justify-content:space-between}.license{font-size:11px;background:#fafafa;padding:15px;border-radius:7px}.notice{font-size:12px;border:1px solid var(--line);padding:14px;border-radius:8px;margin:20px 0}.table-scroll{overflow-x:auto}@media(max-width:980px){.header nav{gap:15px;font-size:11px}.converter{grid-template-columns:320px 1fr}.container{padding:0 22px}.article-layout{grid-template-columns:minmax(0,1fr) 220px;gap:30px}.cards{gap:12px}.card{padding:18px}.article-card{padding:0}.footer-grid{gap:20px}}@media(max-width:720px){.container{padding:0 18px}.header-inner{min-height:75px;gap:15px;flex-wrap:wrap;padding-top:15px;padding-bottom:12px}.brand{font-size:21px}.header nav{gap:19px;overflow:visible;flex-wrap:wrap;padding-top:3px;width:100%;font-size:11px}.dropdown{top:24px;left:0;min-width:185px}.top-note{font-size:9px;padding:8px}.hero{padding:28px 0 22px}h1{font-size:32px;letter-spacing:-1px}.intro{font-size:14px}.quick-links{gap:7px}.pill{font-size:10px;padding:8px 11px}.converter{display:flex;flex-direction:column}.tool-controls{border-right:0;border-bottom:1px solid var(--line);padding:20px}.viewport{min-height:340px;height:340px;flex:none}.preview-head{padding:18px}.trust{display:grid;grid-template-columns:1fr 1fr;font-size:10px;gap:14px}.section{padding:32px 0}h2{font-size:25px}.cards{grid-template-columns:1fr}.steps{grid-template-columns:1fr;gap:8px}.split{grid-template-columns:1fr;gap:20px}.section-head{align-items:flex-start}.section-head a{font-size:11px;white-space:nowrap}.article-layout{display:flex;flex-direction:column;gap:25px}.toc{position:static;order:-1}.article-body{font-size:15px}.article-body h2{font-size:24px;scroll-margin-top:145px}.article-body .standfirst{font-size:17px}.footer-grid{grid-template-columns:1fr 1fr;gap:25px}.footer-bottom{display:block;line-height:1.8}.breadcrumb{padding-top:17px;font-size:10px}.format-table{font-size:12px}.format-table th,.format-table td{padding:11px}.hero .meta{line-height:1.8}.header{position:relative}}
/* Theme preference is explicit and persists across pages. */
.header-actions{display:flex;align-items:center;gap:9px}.theme-toggle{width:36px;height:36px;border:1px solid var(--line);background:#fff;color:#000;border-radius:8px;font-size:21px}.language-select{max-width:110px;background:#fff;color:#000;border:1px solid var(--line);border-radius:8px;height:36px;padding:0 8px;font-size:12px}html[data-theme=dark]{color-scheme:dark;--purple:#b98aff;--purple-dark:#d1b0ff;--light:#251a35;--line:#39323f;--muted:#bfb7ca;--ink:#f5f2f8;background:#141117;color:#f5f2f8}html[data-theme=dark] body{background:#141117;color:#f5f2f8}html[data-theme=dark] .header,html[data-theme=dark] .dropdown,html[data-theme=dark] .card,html[data-theme=dark] .footer,html[data-theme=dark] .preview-area,html[data-theme=dark] .pill,html[data-theme=dark] .secondary,html[data-theme=dark] .field input,html[data-theme=dark] .field select,html[data-theme=dark] .search-input,html[data-theme=dark] .theme-toggle,html[data-theme=dark] .language-select{background:#1b171f;color:#f5f2f8;border-color:var(--line)}html[data-theme=dark] .brand,html[data-theme=dark] .header nav>a,html[data-theme=dark] .header summary,html[data-theme=dark] .dropdown a,html[data-theme=dark] p,html[data-theme=dark] small,html[data-theme=dark] .card p,html[data-theme=dark] .article-body,html[data-theme=dark] h1,html[data-theme=dark] h2,html[data-theme=dark] h3,html[data-theme=dark] .toc a,html[data-theme=dark] .footer a,html[data-theme=dark] .breadcrumb,html[data-theme=dark] .breadcrumb a,html[data-theme=dark] .empty-preview strong,html[data-theme=dark] #filename,html[data-theme=dark] .status,html[data-theme=dark] .trust,html[data-theme=dark] .footer-bottom,html[data-theme=dark] .meta{color:#f5f2f8}html[data-theme=dark] a,html[data-theme=dark] h1 span,html[data-theme=dark] .eyebrow{color:var(--purple)}html[data-theme=dark] .primary,html[data-theme=dark] .download{background:#8342dc;color:#fff}html[data-theme=dark] .viewport{background:radial-gradient(ellipse,#251f2c 30%,#19151e 100%)}html[data-theme=dark] .drop,html[data-theme=dark] .toc,html[data-theme=dark] .format-table th,html[data-theme=dark] .license{background:#211a29}html[data-theme=dark] .caption{color:#bfb7ca!important}html[data-theme=dark] .preview-head{border-color:var(--line)}html[data-theme=dark] .top-note{color:#dbc4ff}html[data-theme=dark] .status.error{color:#ffaaa5}@media(max-width:1100px){.header-inner{flex-wrap:wrap;gap:14px;padding-top:14px;padding-bottom:14px}.header-actions{margin-left:auto}.header nav{order:3;width:100%;justify-content:center}}@media(max-width:720px){.header nav{justify-content:flex-start}.language-select{max-width:94px}.header-inner{gap:9px}.theme-toggle{width:33px}.header .brand{font-size:18px}}
html[data-theme=dark] .empty-preview,html[data-theme=dark] .preview-head .check{color:#f5f2f8}.translated-references{display:block;margin-top:.3em;font-size:.9em}.card[id^=format-]{scroll-margin-top:120px}
/* v4: comfortable reading at desktop and mobile sizes. */
:root{font-size:18px}.header nav{font-size:16px;gap:24px}.top-note{font-size:14px;padding:12px}.intro{font-size:19px}.breadcrumb{font-size:14px}.eyebrow,.card-label{font-size:13px}.pill{font-size:14px;padding:10px 16px}.section-label{font-size:16px}.num{font-size:13px;width:28px;height:28px}.drop strong{font-size:16px}.drop small,#filename,.field small,.preview-bottom small{font-size:13px}.field{font-size:15px}.field input,.field select{font-size:16px;height:46px}.check,.preview-head .check,.advanced,.status{font-size:14px}.primary,.download,.secondary{font-size:16px;padding:12px 20px}.preview-head{font-size:16px}.empty-preview{font-size:16px}.empty-preview strong{font-size:20px}#metrics{font-size:14px}.trust{font-size:14px}.section>p,.split p{font-size:18px}.card p,.steps p,.faqs p{font-size:16px}.card h3,.steps h3{font-size:21px}.card a.more,.button-row a,.section-head a{font-size:15px}.article-body{font-size:19px;line-height:1.85}.article-body h2{font-size:31px}.article-body h3{font-size:25px}.article-body h4{font-size:21px}.caption{font-size:13px!important}.meta,.toc,.callout{font-size:15px}.faqs summary{font-size:18px}.footer a,.footer p,.footer h3{font-size:15px}.footer-bottom{font-size:13px}.search-input{font-size:17px}.language-select{max-width:155px;font-size:15px;height:42px}.theme-toggle{width:42px;height:42px}.brand-logo{width:45px;height:45px;flex:none}.brand{gap:11px}.brand-wordmark{display:flex;flex-direction:column;line-height:1.06;letter-spacing:-.7px}.brand-wordmark b{font-size:24px;font-weight:850}.brand-wordmark small{font-size:13px;font-weight:600;letter-spacing:1.2px;color:var(--purple)}.tools-menu{position:static!important}.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%);width:min(1180px,96vw);max-height:75vh;overflow:auto;background:#fff;border:1px solid var(--line);box-shadow:0 18px 50px #0002;border-radius:0 0 14px 14px;padding:24px;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:25px}.mega-menu h3{font-size:16px;color:var(--purple);margin:0 0 12px}.mega-menu a{display:block;padding:7px 0;font-size:15px;text-decoration:none;color:#000}.mega-menu a:hover{text-decoration:underline;color:var(--purple)}.mega-menu .menu-all{grid-column:1/-1;border-top:1px solid var(--line);padding-top:12px}.model-card img{width:calc(100% + 44px);max-width:none;margin:-22px -22px 18px;aspect-ratio:3/2;object-fit:contain;background:#f7f5fb;border-radius:10px 10px 0 0}.model-card h2{font-size:24px!important}html[data-theme=dark] .mega-menu{background:#1b171f}html[data-theme=dark] .mega-menu a{color:#f5f2f8}html[data-theme=dark] .model-card img{background:#211a29}@media(max-width:980px){.mega-menu{grid-template-columns:repeat(2,minmax(0,1fr))}.model-card img{margin:-18px -18px 18px;width:calc(100% + 36px)}}@media(max-width:720px){.header nav{font-size:15px;gap:17px}.top-note{font-size:12px}.intro{font-size:18px}.article-body{font-size:18px}.article-body h2{font-size:27px}.article-body h3{font-size:23px}.trust{font-size:13px}.brand-logo{width:38px;height:38px}.brand-wordmark b{font-size:21px}.brand-wordmark small{font-size:11px}.language-select{font-size:14px;max-width:139px}.header-actions{gap:6px}.mega-menu{top:auto;margin-top:15px;max-height:70vh;padding:18px;gap:16px}.mega-menu a{font-size:14px}.footer-grid{gap:25px}.footer a,.footer p{font-size:14px}.converter{grid-template-columns:1fr}.tool-controls{padding:22px}.toc{font-size:15px}.pill{font-size:13px}.section-head a{white-space:normal}}
.format-table{font-size:16px}.license,.caption,.meta,.translated-references{font-size:15px}.small-note,.hint,.stat span{font-size:15px}.mega-column a{white-space:normal}.mega-bottom{grid-column:1/-1;display:flex;gap:24px;border-top:1px solid #e5e1eb;padding-top:14px}.article-body [data-article-body]{display:block}

/* Decorative empty preview: no model is loaded before upload. */
#empty-preview{background:#0d0c15 url('/assets/empty-preview.v1.svg') center center/contain no-repeat;overflow:hidden;padding:0}
#empty-preview>.empty-icon{display:none}
#empty-preview>strong,#empty-preview>span:not(.empty-icon){position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}